JP2015063124A - Container with shock absorber - Google Patents

Abstract

In a writing instrument that receives a conventional writing pressure by a shock absorber, a contact portion between a cushion member and a shaft cylinder is always the same portion, and a protrusion formed on the cushion member is repeatedly crushed each time writing pressure is received. Therefore, the elasticity of the cushion member is likely to decrease due to the deformation, and in the worst case, the cushion member is crushed. A container including a shaft tube, a member provided in the shaft tube and provided with a pressure-sensitive portion, and a shock absorber for biasing the member provided with the pressure-sensitive portion forward. The shock absorber is composed of an elastic member and an indenter member that crushes the elastic member, and a protrusion is formed on a surface of the indenter member that contacts the elastic member, and at least the elastic member of the shock absorber is provided. A container provided with a shock absorber characterized by comprising independent parts. [Selection] Figure 2

Description

  The present invention relates to a container provided with a shock absorber.

2. Description of the Related Art Conventionally, a writing instrument that receives a writing pressure generated by a mechanical pencil core or a ballpoint pen refill being pressed against a paper surface by a shock absorber is generally known. For example, the writing instrument has a configuration disclosed in Patent Document 1. .
The structure disclosed in Patent Document 1 is a writing instrument in which a shock absorber is provided between a clamp of a mechanical part for holding a core of a mechanical pencil or a refill of a ballpoint pen and a shaft cylinder, and is a synthetic resin coupling tool A cushioning device is formed by forming a cushion member made of a soft material at the rear part by two-color molding, and a protrusion is formed on the cushion member, and the protrusion is pressed against a shaft tube. A writing instrument is disclosed.
In the writing instrument disclosed in Patent Document 1, when the lead receives a writing pressure during writing, the writing pressure is transmitted to the connecting tool through the chuck and the fastener, and the connecting tool gradually begins to receive the writing pressure. Since the protrusion of the cushion member is compressed, the writing pressure can be absorbed and the writing can be performed with a soft writing feeling when the writing pressure is applied. At this time, since the protrusion of the cushion member penetrates the opening window of the connector and is not in close contact with the rear cylinder surface of the connector, the protrusion of the cushion member is reliably deformed and compressed. Further, the cushion member is fixed by being put on the raised portion of the coupling tool, and the protrusion penetrates the opening window of the coupling tool to prevent rotation, so that the cushioning member is deformed and set only in the longitudinal direction. Compressed. Moreover, since the rib formed in the outer peripheral surface of the rear part is inserted into the concave groove of the shaft tube and slides, the connector has a configuration in which the connector cannot rotate with respect to the shaft tube.
Here, in the writing instrument disclosed in Patent Document 1, as described above, since the protrusion is configured to penetrate the opening window of the connector and prevent rotation, one of the cushion members is used. Since only the portion (projection) is deformed only in the compression (longitudinal) direction, stress is locally concentrated on the projection of the cushion member. Further, the contact portion between the cushion member and the shaft cylinder is always the same place, and the protrusion is repeatedly crushed every time the pen pressure is applied. There is a problem that an appropriate buffering force cannot always be obtained due to crushing.

JP 2011-126061 A

  The problem to be solved by the present invention is that the same portion of the elastic member (cushion member) is repeatedly crushed so that the elastic force of the elastic member is reduced or crushed, so that an appropriate buffering force is always obtained. There is no point.

  The container of the present invention made to solve the above-described problems includes a shaft tube, a member provided in the shaft tube and having a pressure-sensitive portion, and a member having the pressure-sensitive portion biased forward. The shock absorber is composed of an elastic member and an indenter member that crushes the elastic member, and a protrusion is formed on a surface of the indenter member that contacts the elastic member. Both are characterized in that at least the elastic member of the shock absorber is composed of independent parts.

  A writing instrument according to the present invention is a container including a shaft cylinder, a member provided in the shaft cylinder and provided with a pressure-sensitive portion, and a shock absorber for biasing the member provided with the pressure-sensitive portion forward. The shock absorber is composed of an elastic member and an indenter member that crushes the elastic member, and a protrusion is formed on a surface of the indenter member that contacts the elastic member, and at least the elastic member of the shock absorber is formed. Since the member is composed of independent parts, the location where the elastic member and the protrusion of the indenter member are in contact with each other can be changed, or the elastic member can be replaced, so that an appropriate buffering force can always be obtained.

The disassembled perspective view which shows the mechanical pencil concerning 1st Embodiment of this invention. The whole longitudinal cross-sectional view which shows the mechanical pencil concerning 1st Embodiment of this invention. The front longitudinal cross-sectional view which shows the mechanical pencil concerning 1st Embodiment of this invention. The external appearance perspective view which shows the outer cylinder, cushion sleeve, flat ring, and crown ring concerning 1st Embodiment of this invention. The front which shows the state after performing a pressing operation (core feeding operation) from the state where the writing core protrudes 1.0 mm from the tip of the core protection tube of the mechanical pencil according to the first embodiment of the present invention, and protruding the writing core. FIG. The front longitudinal cross-sectional view which shows the state which the writing core of the mechanical pencil concerning 1st Embodiment of this invention received the writing pressure from the paper surface. FIG. 3 is an external view showing an outer cylinder, a cushion sleeve, a flat ring, and a crown ring in a state where the writing core of the mechanical pencil according to the first embodiment of the present invention receives writing pressure from the paper surface. The external view which shows the outer cylinder, cushion sleeve, flat ring, and crown ring in the unused state of the mechanical pencil concerning 2nd Embodiment of this invention. The external view which shows the outer cylinder, cushion sleeve, flat ring, and crown ring in the state where the writing core of the mechanical pencil concerning 2nd Embodiment of this invention received the writing pressure from the paper surface. The external view which shows the outer cylinder, cushion sleeve, flat ring, and crown ring in the unused state of the mechanical pencil which is a modification of 2nd Embodiment of this invention. The external view which shows the outer cylinder, the cushion sleeve, the flat ring, and the crown ring in the state where the writing core of the mechanical pencil as a modification of the second embodiment of the present invention has received the writing pressure from the paper surface. The external view which shows the outer cylinder, cushion sleeve, flat ring, crown ring in the unused state of the mechanical pencil concerning 3rd Embodiment of this invention. The external view which shows the state which the writing ring of the mechanical pencil concerning 3rd Embodiment of this invention received writing pressure from the paper surface, and the flat ring with a small elastic force which is a buffer device buffered. The external view which shows the state which the writing core of the mechanical pencil concerning 3rd Embodiment of this invention received writing pressure from the paper surface, and also buffered the flat ring with a large elastic force which is a buffer device. The whole longitudinal cross-sectional view which shows the mechanical pencil concerning 5th Embodiment of this invention. The front longitudinal cross-sectional view which shows the mechanical pencil concerning 5th Embodiment of this invention. The external view which shows the outer cylinder, cushion sleeve, and flat ring concerning 5th Embodiment of this invention. Front longitudinal section showing a state in which the tip of the lead protection tube of the mechanical pencil according to the fifth embodiment of the present invention and the writing lead are flush with each other and a pressing operation (core feeding operation) is performed to project the writing lead by 0.5 mm. Figure. The front longitudinal cross-sectional view which shows the state which the writing core of the mechanical pencil concerning 5th Embodiment of this invention received the writing pressure from the paper surface. The external view which shows the outer cylinder, cushion sleeve, and flat ring of the state where the writing core of the mechanical pencil concerning 5th Embodiment of this invention received the writing pressure from the paper surface.

The configuration of the first embodiment of the present invention will be described with reference to the drawings. In the following description, the pen tip side is referred to as the “front side”.
FIG. 1 is an exploded perspective view of the mechanical pencil according to the first embodiment of the present invention, FIG. 2 is an overall longitudinal sectional view of the mechanical pencil according to the first embodiment of the present invention, and FIG. FIG. 4 is an external perspective view showing an outer cylinder, a cushion sleeve, a flat ring, and a crown ring according to the first embodiment of the present invention. 2 and FIG. 3 are diagrams in the unused state (state before writing) of the mechanical pencil in which the writing core P protrudes 1.0 mm from the tip of the core protection tube 3.

The mechanical pencil A according to the first embodiment of the present invention has a shaft tube, and the shaft tube is composed of an outer tube 1 and a tip portion 2 attached to the outer tube 1. The lip portion 2 is provided with a core protection tube 3 at the front end portion thereof, and a rubber wick holding member 4 that functions as a detent of the writing core P is provided inside the lip portion 2. .
Further, inside the mechanical pencil A, a middle shaft set (writing body) B is disposed.
The middle shaft set B includes a chuck 5, a chuck ring 6, a cushion sleeve 7, a chuck spring 8, a relay 9, and a lead tank 10, and constitutes a lead feeding mechanism (writing lead projecting means). A flat ring 11 and a crown ring 12 functioning as a shock absorber are disposed between the rear end surface of the flange portion 7a of the cushion sleeve 7 of the central shaft set B built in the mechanical pencil A and the front end surface of the outer cylinder 1. ing.
Further, an eraser receiver 13 for supporting the eraser 14 is attached to the rear end portion of the lead tank 10 so as to be detachable from the lead tank 10, and a cap 15 covering the eraser 14 is attached to the eraser receiver 13. On the other hand, it is configured to be detachable.

The above is the configuration of the present embodiment, but each member constituting the first embodiment including each unit will be described in detail.
The outer cylinder 1 has a cylindrical shape, has a reduced diameter portion 1a formed at the outer peripheral front portion, and further has a male screw portion 1b formed at the outer peripheral portion thereof. A plurality of step portions are formed inside the tip portion 2 together with a cylindrical hole (inner hole), and the inner hole is formed from an inner hole 2c having a maximum inner diameter formed at the rear end of the tip portion 2, An inner hole 2d, an inner hole 2e, and a core protection tube press-fitting hole 2a are formed so that the inner diameter gradually decreases toward the front of the tip portion 2. The chuck ring release step 2f is formed as a step formed by the inner hole 2c and the inner hole 2d, and the sleeve receiving step 2g is formed as a step formed by the inner hole 2b and the inner hole 2c. Furthermore, a female screw portion 2h is formed in the inner hole 2b of the tip portion 2 from the substantially middle portion to the rear, and is formed on the outer peripheral portion of the reduced diameter portion 1a formed on the outer peripheral front portion of the outer cylinder 1. The outer cylinder 1 and the lip portion 2 are fixed by screwing with the male screw portion 1b.
In addition, as a fixing method of this outer cylinder 1 and the lip | edge part 2, you may carry out press-fit fixation without engaging with a screw part, or you may make it engage / disengage. Further, a core protection tube 3 is press-fitted and fixed to the core protection tube press-fitting hole 2a of the tip portion 2, and a rubber core holding member 4 which functions as a detent of the writing core P to the inner hole 2e. The A core insertion hole 4 a for holding the writing core P is formed in the center of the core holding member 4.
The core protection tube 3 is disposed for the purpose of protecting the fed core and improving the visibility, but may be formed integrally with the tip portion 2. The material used for the core protection tube 3 may be resin or the like, but for the purpose of protecting the core (the function of preventing the core breakage of the writing core), it is preferable to use a metal, specifically iron. , And alloys thereof, copper, and alloys thereof.
As the outer shape of the core holding member 4, the front has a cylindrical shape whose diameter is smaller than that of the rear, and the material used for the core holding member 4 may be an elastic resin, specifically, , Nitrile butadiene rubber, silicone rubber, fluorine rubber and the like.
Further, in the first embodiment, the core protection tube 3 is press-fitted and fixed to the tip 2, but this is not the case. For example, the core protection tube 3 is a slider type that retreats when contacting the paper surface. May be. In the case of the slider type, the friction force that the slider is housed in the lip portion is larger than the gripping force that the wick holding member 4 grips the writing core P, so that the slider is placed in the lip portion by the shock absorber. The writing core P may be retracted into the core protection tube 3 before it is retracted, and the centering amount from the core protection tube 3 may be shortened to make the core difficult to break.

As described above, the middle shaft set B includes the chuck 5, the chuck ring 6, the cushion sleeve 7, the chuck spring 8, the relay 9, and the lead tank 10.
The chuck 5 has a substantially cylindrical shape, and has a large-diameter portion 5a at the front portion thereof, and a split or split slit is formed on the outer periphery of the large-diameter portion 5a. It is made possible. The large diameter portion 5 a of the chuck 5 is surrounded by a cylindrical chuck ring 6, and the outer periphery of the large diameter portion 5 a is engaged with the inner periphery of the chuck ring 6. The rear side of the chuck 5 is press-fitted and fixed to the front end of a cylindrical relay 9, and the relay 9 is formed with a large-diameter portion 9a having an enlarged diameter at an approximately middle portion of the outer peripheral surface thereof. . In the first embodiment, the rear side of the relay 9 is press-fitted and fixed to the front end of the cylindrical core tank 10, but the relay 9 and the core tank 10 may be integrally formed. good.
The cushion sleeve 7 has a substantially cylindrical shape, and has a flange portion 7a whose diameter is increased at the front end portion thereof. The cushion sleeve 7 has a large diameter inside the cushion sleeve 7 from the front to the rear end portion. A relay sliding hole 7b having a diameter larger than the outer diameter of the portion 9a is formed. Here, the inner diameter portion of the front end of the cushion sleeve 7 is called a chuck sliding hole 7c, and the inner diameter step portion formed by the chuck sliding hole 7c and the relay sliding hole 7b is called a chuck spring seat 7d.

  As an assembly method of the middle shaft set B, the rear end portion of the relay 9 is press-fitted and fixed to the core tank 10, the inner diameter is larger than the outer diameter in front of the relay 9, and the outer diameter is larger than the outer diameter of the large diameter portion 9a of the relay 9. The small chuck spring 8 is attached in such a manner that the rear end portion thereof is in contact with the front end surface of the large diameter portion 9a of the relay 9. Further, the cushion sleeve 7 is inserted from the rear end side of the relay sliding hole 7b, the chuck spring receiving seat 7d of the cushion sleeve 7 is brought into contact with the front end of the chuck spring 8, and the chuck spring 8 is compressed by being pushed in. Then, the rear end portion of the chuck 5 surrounded by the chuck ring 6 is passed through the chuck sliding hole 7c of the cushion sleeve 7 and is press-fitted into the front end of the relay 9, thereby forming an intermediate shaft set B. The chuck spring 8 pushes the cushion sleeve 7 forward by the biasing force, and pushes the chuck ring 6 forward because the front end surface of the cushion sleeve 7 is in contact with the rear end surface of the chuck ring 6. . When the chuck ring 6 is pushed forward, the large diameter portion 5a of the chuck 5 is surrounded, and then a force for pushing the chuck 5 forward acts. However, the chuck 5 is press-fitted and fixed to the relay 9. , It is configured not to be pushed any further. That is, since the chuck spring 8 is stretched between the large diameter portion 9a of the relay 9 and the chuck spring seat 7d of the cushion sleeve 7, a force for pulling the chuck 5 away by the relay 9 via the chuck ring 6 is generated. However, since the force that press-fits the chuck 5 with respect to the relay 9 is stronger than the biasing force of the chuck spring 8, the chuck 5 does not operate any more and is fixed in that state.

A flat ring 11 and a crown ring 12 are provided in the rear end surface of the flange 7a of the cushion sleeve 7 of the center shaft set B built in the mechanical pencil A and the front end surface of the outer cylinder 1 to function as a shock absorber. ing. The flat ring 11 has a cylindrical shape, and may be a member (elastic member) made of a material capable of elastic deformation such as nitrile butadiene rubber, silicone rubber, or fluoro rubber. In addition, as another example, resin or metal that can be elastically deformed in shape may be used, and the shape is not limited to a cylindrical shape. For example, the cross section is a circular O-ring, or the cross section is irregular. It may be a ring.
Further, the crown ring 12 has a cylindrical shape, and is used as an indenter member for crushing the flat ring 11, so that protrusions 12 a having substantially square pillars are radially formed on the front end surface thereof. Yes. In the present embodiment, the crown ring 12 is made of polyacetal resin, but the material is not limited to this, and other resin or metal may be used.
Here, when the flat ring 11 is crushed, the corner of the surface of the projection 12a of the crown ring 12 that abuts on the flat ring 11 may be a square shape, but in the first embodiment, it is formed by a curved surface. For this reason, when the flat ring 11 is crushed, the surface of the flat ring 11 that receives stress increases along with the crushing, and the stress applied to the flat ring 11 during the crushing is dispersed, making it difficult to further reduce the elasticity. Is obtained.
In the first embodiment, the protrusions 12a are formed at four locations on the circumference of the crown ring 12 so as to be equally spaced every 90 degrees. In practice, it is only necessary that at least two protrusions 12 a are formed at equal intervals on the circumference of the crown ring 12. This is because, for example, when it is formed only at one place, the crown ring 12 is supported in a cantilevered state with respect to the flat ring 11, and depending on the position of the protrusion 12a at the time of writing, This is because an appropriate buffering effect cannot be obtained.

Since the flat ring 11 and the crown ring 12 function as a shock absorber, the cylindrical flat ring 11 is inserted to the rear end of the flange portion 7a of the cushion sleeve 7 with respect to the outer diameter portion of the cushion sleeve 7 of the center shaft set B. Subsequently, the crown ring 12 is inserted into the outer diameter portion of the cushion sleeve 7 and assembled so that the projection 12a of the crown ring 12 contacts the rear end of the flat ring.
At this time, it is desirable that the elastic force (biasing force) of the shock absorber constituted by the flat ring 11 and the crown ring 12 is set to be equal to or less than the writing load applied to the writing surface by the writer. The elastic force of the shock absorber can be appropriately adjusted by adjusting the elastic force of the elastic member used for the flat ring 11 according to the material or hardness. Even when the material or hardness of the flat ring 11 is not changed, it can be appropriately adjusted by changing the contact area of the protrusion 12a of the crown ring 12 to be brought into contact with the flat ring 11. . When the contact area of the projection 12a of the crown ring 12 to be brought into contact with the flat ring 11 is changed, for example, when it is desired to increase the elastic force, the contact area may be increased, and conversely, when the elastic force is desired to be weakened. The contact area may be reduced. In order to prevent deterioration of the flat ring 11 (reduction in elastic force) due to repeated use, it is necessary to select appropriately based on the above configuration.
Further, as the configuration of the shock absorber, the crown ring 12 is inserted into the cushion sleeve 7 first, for example, since the protrusion 12a of the crown ring 12 may be assembled so as to contact the rear end of the flat ring. Then, the flat ring 11 may be inserted. Furthermore, in order to reduce the number of parts, the crown ring 12 may not be provided, and in that case, a protrusion is provided on either the front end surface or the rear end surface in contact with the flat ring 11. For example, the crown ring 12 can be substituted by providing a projection on the rear end surface of the collar 7a of the cushion sleeve 7, or the crown ring 12 can be substituted by providing a projection on the front end surface of the outer cylinder 1. good. Various arrangement methods such as providing protrusions on both the outer cylinder 1 and the rear end surface of the flange portion 7a of the cushion sleeve 7 are conceivable.

In the mechanical pencil A, the flat ring 11, the crown ring 12, and the central shaft set B are built in the outer cylinder 1, and the female screw part 2 h of the mouth part 2 and the male screw part 1 b of the outer cylinder 1 are The flange 7a of the cushion sleeve 7, the flat ring 11, and the crown ring 12 are sandwiched and connected by screwing, and the rear end of the core tank 10 and the eraser receiver 13 are assembled and attached to the eraser receiver 13. The eraser 14 and the cap 15 covering the eraser 14 are configured to be detachable from the eraser receiver 13, and this state becomes an unused state.
Further, the rear end surface of the lip portion 2 comes into contact with the stepped portion on the rear side of the male screw portion 1b of the outer cylinder 1 to complete the screwing between the lip portion 2 and the outer cylinder 1. At this time, the outer cylinder 1 and the lip portion are completed. 2, the flat ring 11 and the crown ring 12 are in a state in which there is no gap in the axial direction when the screwing is complete (the flat ring 11 abuts on the projection 12 a of the crown ring 12. Or a slightly compressed state). This is because, for example, in the state where the screwing is complete, when there is a gap in the axial direction, the middle shaft set B in the mechanical pencil A is free in the axial direction by the gap ( This is because it becomes a slidable state. When used in such a state, the mechanical shaft A in the mechanical pencil A slides due to the movement of the mechanical pencil A accompanying the writing operation, and vibrations are transmitted to the fingers or a rattling sound is generated. An annoying phenomenon occurs during writing, which hinders the user's writing.

Next, the lead feeding (writing core protrusion) operation in the first embodiment of the present invention will be described with reference to the drawing of FIG. FIG. 5 shows a state after performing a pressing operation (core feeding operation) from a state of a mechanical pencil in which the writing core P protrudes 1.0 mm from the tip of the core protection tube 3, and the core protrudes 1.3 mm.
When the rear end of the cap 15 is pressed from the state shown in FIG. 3, the eraser receiver 13, the core tank 10, the relay 9, the chuck 5, and the chuck ring 6 move forward as the cap 15 moves forward. At that time, the front end of the flange portion 7a of the cushion sleeve 7 is in contact with the sleeve receiving step portion 2g of the lip portion 2 and does not move any further, so that the chuck spring seat 7d of the cushion sleeve 7 and the relay 9 The chuck spring 8 stretched between the front end surface of the large diameter portion 9a is compressed by the forward movement of the relay 9. Next, when the front end surface of the chuck ring 6 comes into contact with the chuck ring release step 2 f of the tip 2, the chuck 5 moves forward with respect to the chuck ring 6 and is retracted while being reduced in diameter to the inner diameter portion of the chuck ring 6. The large-diameter portion 5a of the chuck 5 that has been released is released and expanded, and the writing core P held inside the large-diameter portion 5a is also released. At this time, the writing core P is held by the core holding member 4, and the advancement of the writing core P stops with the expansion of the large diameter portion 5a.
That is, the writing core P is substantially equal to the distance traveled by the pressing operation until the chuck ring 6 advances and the front end of the chuck ring 6 contacts the rear end of the chuck ring release step 2f. The amount will be paid out. In addition, by arbitrarily designing the distance between the front end portion of the chuck ring 6 and the rear end portion of the chuck ring release step portion 2f, the length of feeding the core by one press can be freely set. .
Further, in the first embodiment, the pressing operation can be performed until the front end surface of the outer flange portion 13 a formed at the substantially intermediate portion of the eraser receiver 13 contacts the rear end surface of the outer cylinder 1. When the pressing operation is released, the compressed chuck spring 8 is restored to its original state, so that the chuck 5, the chuck ring 6, the core tank 10, etc., as the front end surface of the large-diameter portion 9a of the relay 9 is retracted. Each of the parts also moves backward. At that time, the chuck 5 moves backward, but the position where the writing core P protrudes from the tip of the core protection tube 3 is maintained by the frictional force between the writing core P and the core holding member 4. The large diameter portion 5 a comes into contact with the chuck ring 6 by the retreat of the chuck 5, and the rear end surface of the chuck ring 6 comes into contact with the front end surface of the cushion sleeve 7. Thereafter, the large diameter portion 5 a of the chuck 5 is drawn into the chuck ring 6, and the large diameter portion 5 a of the chuck 5 is again surrounded by the chuck ring 6, and the large diameter portion 5 a of the chuck 5 grips the writing core P again.
The above is the feeding operation of the writing core P. For example, when the protruding amount of the writing core P from the tip of the core protection tube 3 is not sufficient, the operation of pressing the rear end of the cap 15 again is performed. It is possible to adjust the projection amount of the desired writing core P.

Next, the operation of the mechanical pencil when the writing core is subjected to writing pressure during writing will be described with reference to FIGS. FIG. 6 is a front longitudinal sectional view showing a state in which the writing core of the mechanical pencil receives a writing pressure from the paper surface, and FIG. 7 shows an outer cylinder, a cushion sleeve in a state in which the writing core of the mechanical pencil receives the writing pressure from the paper surface, The external view of a flat ring and a crown ring is shown.
From the state of FIG. 3, when the writing core P comes into contact with the paper surface and the writing core P receives the writing pressure, the chuck 5 holding the writing core P receives the writing pressure. That is, when the writing core P receives the writing pressure, as shown in FIG. 6, the writing pressure applied to the writing core P is also transmitted to the middle shaft set B including the chuck 5 holding the writing core P. Since the flat ring 11 and the crown ring 12 configured as shock absorbers are interposed between the front end surface of the outer cylinder 1 and the flange portion 7a of the cushion sleeve 7, the intermediate shaft set B is subjected to writing pressure. Then, the shock absorber is gradually compressed to absorb the writing pressure, and the writing core P moves backward into the core protection tube 3. Here, the operation when the shock absorber receives the writing pressure will be described in detail. When a load in the backward direction due to the writing pressure is transmitted to the cushion sleeve 7, the cushioning device 7 is arranged at the rear end portion of the flange portion 7 a. The flat ring 11 provided also tends to retreat by the flange portion 7a. Since the projection 12a of the crown ring 12 is in contact with the rear end surface of the flat ring 11, the flat ring 11 is retracted while the retracting operation is performed, and only the contact portion is compressed by the projection 12a of the crown ring 12. .
By the above operation, the middle shaft set B is retracted inside the mechanical pencil A. At this time, since the writing core P is gripped by the chuck 5 of the middle shaft set B, the middle shaft set B is interlocked with the middle shaft set B. , Retreat by the same distance. Further, the retreat distance in the first embodiment is preferably about 0.5 mm or less. This is because if the retraction is further advanced, the writing core P will feel embedded in the core protection tube 3 at the time of writing, leading to a sense of incongruity felt by the user, or when the writer writes the next character rather than the retraction amount. This is because it is necessary to perform writing with the tip of the writing core P largely separated from the paper surface. In general, the writing operation is performed with the writing core P protruding from the core protecting tube 3 by about 1.0 mm. However, if the retraction amount is set to be larger than that, the writing core P is not written at the time of writing. In order to be completely immersed in the core protection tube 3, when a writing operation is performed, writing pressure is not directly applied to the paper surface, but writing is performed with the resilience of the buffer device. For this reason, not only can the handwritten characters intended by the user be written, but also the tip surface of the core protection tube 3 is in contact with the paper surface, and the resistance during writing is large, making writing very difficult. Therefore, the retraction distance of the writing core is preferably equal to or less than the protruding amount of the writing core P in one feeding operation. Further, as described above, the urging force of the shock absorber constituted by the flat ring 11 and the crown ring 12 is set to be equal to or less than the writing load applied to the writing surface by the writer.
Here, when the shock absorber is constituted by the flat ring 11 and the crown ring 12, a space C is formed between the end surface of the flat ring 11 and the crown ring 12 protrusion 12a. The space C is provided to accommodate the volume deformation of the deformed flat ring 11 when the flat ring 11 is compressed by the projection 12a of the crown ring 12 when the shock absorber is operated. For this reason, when the writing pressure is applied, the writing core P is immediately retracted into the core protector 3 while compressing the shock absorber, and the space portion C is retracted until the space portion C becomes substantially dense due to the deformation of the flat ring 11. By changing the size of the space C in the shock absorber, the retreat amount (buffer amount) with respect to the axial direction can be freely set.
In addition, as the buffering effect, writing can be performed with a soft feel, and since a sudden strong force is not applied to the writing core P at the start of writing, a core breakage preventing effect is obtained, and the writing surface is also strong. There is no trace of pressure (a trace in which the paper surface is recessed by a writing operation). Furthermore, since the writing lead P protruding from the tip of the lead protector 3 moves back into the lead protector 3 due to the buffering effect, the amount of protrusion can be shortened, and the writing lead P becomes more difficult to break.
Although not provided in the first embodiment, it is also possible to add a device for adjusting the load to be buffered with respect to the shock absorber, for example, the first stroke on the writing surface (first brush) ), The load at the start of buffering can be reduced by reducing the depth of the crown ring 12 protrusion 12a relative to the flat ring 11 in contact with the shock absorber, and writing can be performed with a softer feel. Such a configuration may be adopted. In addition, as a device for adjusting the load to be buffered with respect to the shock absorber, the shock absorber and the cushion sleeve 7 are arranged in a gap where the outer cylinder 1 and the tip portion 2 are screwed together. Therefore, for example, a mechanism capable of adjusting the distance in the axial direction by screwing of the outer cylinder 1 and the tip portion 2 may be used, or a buffer disposed in a gap where the outer tube 1 and the tip portion 2 are screwed. A separate member may be provided in addition to the device and the cushion sleeve 7, and a mechanism (buffer load adjusting mechanism) that can adjust the crushing distance of the shock absorber by another member that can be operated from the outside of the shaft cylinder 1 may be used.

Next, the operation when the input of writing pressure is canceled will be described. When the input of the writing pressure is released, the rear end surface of the cushion sleeve 7 is moved forward by the restoring force of the flat ring 11 of the shock absorber compressed by the input of the writing pressure, so that it is retracted together with the input of the writing pressure. The middle shaft set B also moves forward. The intermediate shaft set B moves forward in the mechanical pencil A by the above-described releasing operation of the writing pressure. At this time, since the writing core P is gripped by the chuck 5 of the intermediate shaft set B, the intermediate shaft set B is interlocked with the intermediate shaft set B. Move forward by the same distance and restore to the unused state. Therefore, at this time, the user can be given a feeling that the writing core P has been sent out.
The writer writes characters such as kanji, hiragana, katakana, alphabets and numbers, and draws a picture, but repeats the action of bringing the lead into contact with the writing surface and releasing the lead for each stroke or stroke. Things are common, and the beginning and end of writing are frequently repeated. Therefore, since the flat ring 11 of the shock absorber expands and contracts every time writing is started and finished, the shock absorbing force is received each time.

Here, in the first embodiment, an outer cylinder 1 and a middle shaft set B disposed in the outer cylinder 1 are provided, and the middle shaft set B is provided with a cushion sleeve 7 in which a flange portion 7a is formed. A mechanical pencil having a shock absorber for urging the cushion sleeve 7 of the middle shaft set B forward, and when the writing core receives a writing pressure during writing, the flat ring 11 of the shock absorber is deformed, and the flat ring The writing core P is moved backward while receiving the elastic force of 11 and the writing core P moves forward by releasing the writing pressure.
Therefore, the forward and backward movements by the writing operation described above are repeatedly performed, so that the flat ring 11 of the shock absorber is repeatedly compressed and restored at substantially the same position by the protrusion 12a of the crown ring 12. May occur. In addition, depending on the user, when using a high load, or when the writing core P protrudes from the inside of the core protector 3, when a shock such as a drop is applied, a load outside the assumed range is applied, and the flat ring 11 It may be plastically deformed, and the function as a shock absorber may be impaired, and the intended writing feeling may be impaired.
However, in this embodiment, each of the flat ring 11 and the crown ring 12 configured as a shock absorber is an independent part, and the relative positional relationship between the parts is not restricted. Due to the compression and restoration operations of the shock absorber, a slight deviation occurs in the positional relationship between the portions where the flat ring 11 and the projection 12a of the crown ring 12 abut. As a result, the place where the flat ring 11 and the projection 12a of the crown ring 12 come into contact with each other shifts and a buffering effect is obtained on a new surface, so that an appropriate buffering force can be received again. As a result, stress does not concentrate at the same position of the flat ring 11 that is an elastic body, so that the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock-absorbing force can always be obtained. Further, when the flat ring 11 is bent, the position of the center shaft set B in the outer cylinder 1 is changed, and a rattling sound is generated at the time of use. It is also possible to prevent problems such as the centering length from changing. In this embodiment, the flat ring 11 is made of an elastomer. However, the flat ring may be an elastic member made of a material having a surface state that makes it more easily slipped from the crown ring. With such a configuration, the displacement of the contact portion of the flat ring 11 with the projection 12a of the crown ring 12 can be more easily generated and increased. And, since the stress is not concentrated on the same position of the flat ring 11 which is an elastic body by repeated compression and decompression operations of the shock absorber by the writing operation, the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock absorbing force is always provided. Can be obtained.
Further, the first embodiment of the present invention is characterized in that the flat ring 11 and the crown ring 12 configured as shock absorbers can be easily divided because they are independent parts. Therefore, the positional relationship between the flat ring 11 and the projection 12a of the crown ring 12 can be changed not only by shifting the contact position of the flat ring 11 with the projection 12a of the crown ring 12 but also by removing the tip 2. It can also be changed directly. More specifically, by operating the crown ring 12 in the rotational direction with respect to the flat ring 11, or by operating the flat ring 11 in the rotational direction with respect to the crown ring 12, the protrusion 12 a of the crown ring 12 becomes flat. The contact location can be changed to a new surface that has not been in contact with the ring 11, and as a result, an appropriate buffering force can be obtained again and used without any problems. In addition, since the flat ring 11 and the crown ring 12 that are configured as a shock absorber have independent component configurations, even if the plane of the flat ring 11 described above is all plastically deformed and the elasticity is reduced, An appropriate shock-absorbing force can be obtained again by a simple operation of replacing only the flat ring 11 that is an elastic member with a new one, which is very convenient for the user.

In the first embodiment, the crown ring 12 of the shock absorber is not necessary in order to reduce the number of components as described above. In this case, the front end surface or the rear end surface that contacts the flat ring 11 is not necessary. It suffices if a protrusion is provided for any one of the above. For example, if the crown ring 12 can be substituted by providing a projection on the rear end surface of the collar 7a of the cushion sleeve 7, or if the crown ring 12 can be substituted by providing a projection on the front end surface of the outer cylinder 1, it can be manufactured at low cost. It is also possible to do.
Further, a mechanical pencil with a built-in middle shaft set generally has a type in which a position is fixed by sandwiching a collar portion provided at a part of the middle shaft set between a tip portion and an outer cylinder. Therefore, in the first embodiment, a clearance (gap) is provided between the front end surface of the outer tube 1 and the sleeve receiving step 2g of the mouth portion 2 in a state where the outer tube 1 and the mouth portion 2 are assembled. A buffering device is provided in the structure to obtain the buffering effect. That is, for example, even in the case of a conventional mechanical pencil that does not cushion, the existing middle shaft set can be changed by changing the configuration in which a clearance is provided by shortening the entire length of the screwed portion with the tip portion and the shock absorber is disposed. In addition, parts other than the outer cylinder can be used, and a mechanical pencil having a buffer function can be easily produced.

In the first embodiment described above, the mechanical pencil is taken as an example, and the medium shaft set B as the member having the pressure-sensitive portion and the pressure-sensitive portion as the writing core P have been described. However, the present invention only needs to be used by pressing against the writing surface in addition to various writing tools such as a ballpoint pen, a marking pen, and a solid drawing material, and in particular, an application such as an eyeliner or a lipstick. A better effect can be obtained by using for a thing with a hard tip member like a tool. Here, in the case of writing instruments, the writing surface refers to the surface on which the writing instrument can be written without being limited to the paper surface, etc. It refers to the surface that is applied to or written on the human body. In the case of a writing instrument, examples of the writing core of the writing body include a refill (chip) in a ballpoint pen, a pen tip in a marking pen, a drawing core in a solid drawing material, and the like in addition to the mechanical pencil core described in the embodiments. Moreover, when using a core like a mechanical pencil, the cross-sectional shape is not limited to a circle, and a square shape or an irregular shape can be used. Regardless of the writing instrument, or especially those with a hard tip member, the writing body (writing core, tip member) is surely retracted by contact with the writing surface, so that the impact load at the start of use is released. Core breakage can be prevented, and writing can be performed with a soft feel. In addition, especially when using a cursive body with a hard tip on the human body, etc., the conventional hard writing feeling will be soft, and there will be features such as reduced pain when writing with a hard tip, It becomes an excellent container.
In addition, the member having the pressure-sensitive portion is not limited to the above-mentioned cursive body, and for example, has a hard pen tip such as a stylus pen (touch pen) and is used by pressing against the contacted surface. It can also be applied to. The contacted surface in this case is a relatively hard glass surface such as a liquid crystal surface of a tablet terminal or a touch panel, but the pen tip is surely retracted by the contact with the contacted surface. The impact load can be released. Therefore, even if the contacted surface is hard, it can be pressed with a soft feel, and by releasing the impact load at the start of use, the pen tip is prevented from being damaged and the impact transmitted to the contacted surface The power can be reduced. In particular, since the contacted surface in this case is repeatedly used, the use of a container provided with a shock absorber provides a very excellent effect on durability.

  Next, the structure of 2nd Embodiment of this invention is demonstrated based on drawing of FIG. 8, FIG. The description of the same configuration as in the first embodiment is omitted. In the second embodiment, unlike the first embodiment, the flat ring 11 that functions as a shock absorber is sandwiched between the same two crown rings 12 and 12 ′ used in the first embodiment. The crown rings 12 and 12 'are arranged so that the respective protrusions 12a and 12a' are opposed to each other with the flat ring 11 interposed therebetween, and are shown in the drawing with respect to the protrusion 12a of the crown ring 12 at the lower side in the figure. The upper crown ring 12 'is characterized in that the protrusions 12a' are arranged so that the phases thereof are different. More specifically, in the second embodiment, the protrusions 12 a ′ of the crown ring 12 ′ are placed between the protrusions 12 a of the crown ring 12, that is, the periphery of the crown ring 12 is circumferential. A crown ring 12 'is disposed at a position rotated 45 degrees in the direction.

Next, the operation of this embodiment will be described. In this embodiment, the deformation process of the flat ring 11 of the shock absorber is different from that of the first embodiment, and will be described in detail below.
FIG. 8 shows an unused state, but when the writing core P receives writing pressure from the state shown in FIG. 8, the writing pressure applied to the writing core P as shown in FIG. It is also transmitted to the middle shaft set B including the chuck 5 holding P. At this time, since the flat ring 11 and the crown rings 12 and 12 ′ configured as shock absorbers are interposed between the front end surface of the outer cylinder 1 and the flange portion 7 a of the cushion sleeve 7, the middle shaft set B is a pen pressure. The buffer is gradually compressed to absorb the writing pressure from the time when the writing core P is applied, and the writing core P moves backward into the core protection tube 3. Here, the operation when the shock absorber receives the writing pressure will be described in detail. When a load in the backward direction due to the writing pressure is transmitted to the cushion sleeve 7, the flat ring sandwiched between the crown rings 12 and 12 '. 11, the projections 12a and 12a 'of the crown rings 12 and 12' are in contact with each other, so that the flat ring 11 is deformed along the projections 12a and 12a 'of the crown ring 12 with the backward movement. More specifically, the crown rings 12 and 12 'are arranged so that the projections 12a and 12a' face each other with the flat ring 11 interposed therebetween, and the projection 12a of the crown ring 12 on the lower side in the figure. In contrast, the projections 12a 'of the crown ring 12' in the upper part of the figure are arranged so that the phases thereof are different from each other, and each of the crown rings 12 'is placed in the middle of the projections 12a of the crown ring 12. Since the crown ring 12 'is disposed at a position rotated 45 degrees in the circumferential direction relative to the crown ring 12, the flat ring 11 is disposed in the vertical direction so that the protrusion 12a' comes. The protrusions 12a and 12a ′ are deformed into a corrugated shape with the protrusions 12a and 12a ′ as a base point. As a result, the flat ring 11 receives the stress almost entirely, so that it is possible to obtain an effect that it is more difficult to reduce the elasticity of the shock absorber.
Similarly to the first embodiment, each of the flat ring 11 and the crown rings 12 and 12 'configured as shock absorbers in this embodiment is an independent component, and the relative positional relationship between the components is the same. Since it is not regulated, there is a slight deviation in the positional relationship between the flat ring 11 and the protrusions 12a and 12a 'of the crown rings 12 and 12' due to repeated compression and restoration operations of the shock absorber by the writing operation. Will occur. Thereby, the location where the flat ring 11 and the projections 12a and 12a 'of the crown rings 12 and 12' come into contact with each other shifts and a buffering effect is obtained on a new surface, so that an appropriate buffering force can be received again. As a result, stress does not concentrate at the same position of the flat ring 11 that is an elastic body, so that the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock-absorbing force can always be obtained. Further, when the flat ring 11 is bent, the position of the center shaft set B in the outer cylinder 1 is changed, and a rattling sound is generated at the time of use. It is also possible to prevent problems such as the centering length from changing. In this embodiment, the flat ring 11 is made of an elastomer. However, the flat ring may be an elastic member made of a material having a surface state that makes it more easily slipped from the crown ring. With such a configuration, it is easier to generate and increase the displacement of the contact portion of the flat ring 11 with the projections 12a and 12a ′ of the crown rings 12 and 12 ′. And, since the stress is not concentrated on the same position of the flat ring 11 which is an elastic body by repeated compression and decompression operations of the shock absorber by the writing operation, the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock absorbing force is always provided. Can be obtained.
Further, the second embodiment of the present invention is characterized in that the flat ring 11 and the crown rings 12 and 12 'configured as shock absorbers are independent parts, and can be easily divided. Therefore, the flat ring 11 and the crown rings 12, 12 are not only shifted by contact with the projections 12 a, 12 a ′ of the crown rings 12, 12 ′ in the flat ring 11 but also by removing the tip 2. It is also possible to directly change the positional relationship between the protruding portions 12a and 12a '. More specifically, the crown ring 12, 12 ′ is operated in the rotation direction with respect to the flat ring 11, or the flat ring 11 is operated in the rotation direction with respect to the crown rings 12, 12 ′. , 12 ′ protrusions 12a, 12a ′ can change the contact location to a new surface that is not in contact with the flat ring 11, and as a result, an appropriate cushioning force can be obtained again, It can be used without. In addition, since the flat ring 11 and the crown rings 12 and 12 'constituting the shock absorber are independent parts, the plane of the flat ring 11 described above is all plastically deformed and the elasticity is lowered. However, since an appropriate buffering force can be obtained again by a simple operation of replacing only the flat ring 11 that is an elastic member with a new one, it is very convenient for the user.

FIG. 10 shows a modification of the second embodiment. In this example, the shape of the projections of the crown rings 16 and 16 ′ is raised in a wave shape (the raised portions 16a and 16a ′). FIG. 10 shows an unused state, and FIG. 11 shows a state in which the shock absorber is activated. In the configuration shown in FIG. 10, since the flat ring 11 has a configuration in which the bulging portions 16a and 16a ′ have substantially the same shape when the flat ring 11 is crushed and deformed, the flat ring 11 as a whole is more configured. Since it becomes possible to receive stress, the effect that the fall of the elasticity of a buffering device becomes difficult is acquired.
Similarly to the first embodiment, each of the flat ring 11 and the crown rings 16 and 16 'configured as shock absorbers in this embodiment is an independent component, and the relative positional relationship between the components is the same. Since it is not regulated, there is a slight shift in the positional relationship between the flat ring 11 and the raised portions 16a and 16a 'of the crown rings 16 and 16' due to repeated compression and decompression operations of the shock absorber by the writing operation. Will occur. Thereby, the location where the flat ring 11 and the projections 16a and 16a 'of the crown rings 16 and 16' contact with each other shifts and a buffering effect is obtained on a new surface, so that an appropriate buffering force can be received again. As a result, stress does not concentrate at the same position of the flat ring 11 that is an elastic body, so that the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock-absorbing force can always be obtained. Further, when the flat ring 11 is bent, the position of the center shaft set B in the outer cylinder 1 is changed, and a rattling sound is generated at the time of use. It is also possible to prevent problems such as the centering length from changing. In this embodiment, the flat ring 11 is made of an elastomer. However, the flat ring may be an elastic member made of a material having a surface state that makes it more easily slipped from the crown ring. With such a configuration, the displacement of the abutting portion of the flat ring 11 with the raised portions 16a and 16a ′ of the crown rings 16 and 16 ′ can be easily generated and increased. And, since the stress is not concentrated on the same position of the flat ring 11 which is an elastic body by repeated compression and decompression operations of the shock absorber by the writing operation, the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock absorbing force is always provided. Can be obtained.
Further, since the flat ring 11 and the crown rings 16 and 16 'configured as shock absorbers are independent parts, they can be easily divided. For this reason, the flat ring 11 and the crown rings 16 and 16 are not only shifted by contact with the raised portions 16a and 16a 'of the crown rings 16 and 16' in the flat ring 11 but also by removing the lip portion 2. It is also possible to directly change the positional relationship between the protruding portions 16a and 16a '. More specifically, the crown ring 16, 16 ′ is operated in the rotational direction with respect to the flat ring 11, or the flat ring 11 is operated in the rotational direction with respect to the crown rings 16, 16 ′. , 16 'raised portions 16a, 16a' can change the contact location to a new surface that is not in contact with the flat ring 11, and as a result, an appropriate buffering force can be obtained again, which is a problem. It can be used without. In addition, since the flat ring 11 and the crown rings 16 and 16 'that are configured as the shock absorbers are independent parts, the plane of the flat ring 11 described above is all plastically deformed and the elasticity is lowered. However, since an appropriate buffering force can be obtained again by a simple operation of replacing only the flat ring 11 that is an elastic member with a new one, it is very convenient for the user.

  Next, the structure of 3rd Embodiment of this invention is demonstrated based on drawing of FIG.12, FIG.13, FIG.14. The description of the same configuration as in the first embodiment is omitted. In the third embodiment, unlike the first embodiment, the projections of the crown ring 17 are formed in the same shape on both the upper surface (17b) and the lower surface (17a), and the flat ring 18 functions as a shock absorber. The crown ring 17 is held in the axial direction by 18 '. Moreover, the elastic force of each flat ring 18 and 18 'which contact | abutted with the projection parts 17a and 17b formed in the upper surface side and the lower surface side of the crown ring 17 has a characteristic. In this embodiment, the elastic force of the flat ring 18 ′ located in the upper part of the drawing is greater than that of the flat ring 18 located in the lower part of the figure, but the positional relationship of each flat ring is reversed. May be.

Next, the operation of this embodiment will be described. In the present embodiment, the deformation process of the flat ring of the shock absorber is different from that of the first embodiment, and will be described in detail below.
FIG. 12 shows an unused state, but when the writing core P receives writing pressure from the state shown in FIG. 12, the writing pressure applied to the writing core P as shown in FIG. It is also transmitted to the middle shaft set B including the chuck 5 holding P, but between the front end surface of the outer cylinder 1 and the flange portion 7a of the cushion sleeve 7, flat rings 18, 18 'configured as shock absorbers are provided. And the crown ring 17 intervene, the middle shaft set B gradually compresses the shock absorber from the time when the writing pressure is applied, absorbs the writing pressure, and the writing core P moves back into the core protection tube 3. To do. Here, the operation when the shock absorber receives the pen pressure will be described in detail. When a load in the backward direction due to the pen pressure is transmitted to the cushion sleeve 7, the protrusion 17a of the crown ring 17 is caused by the pen pressure. The flat ring 18 with the smaller elastic force in contact is deformed along the protrusion 17a of the crown ring 17 with the backward movement. Next, the flat ring 18 ′ having the larger elastic force is deformed along the protrusion 17 b of the crown ring 17 as shown in FIG. 14 by further writing pressure. That is, the flat ring 18 ′ is deformed by the flat ring 18 having a small elastic force by the protrusions 17 a and 17 b arranged in the vertical direction, and then the flat ring 18 ′ having a large elastic force is deformed with the protrusion 17 b as a base point. Therefore, the buffering force can be obtained in stages. For example, when the cursive body receives a sudden impact force from the writing surface, the flat ring 18 having a small elastic force functions as a first shock absorber for buffering the impact force. Then, since the flat ring 18 ′ having a large elastic force can be used as the second shock absorber for enabling the writing feeling when moving to the writing operation with a soft touch, two shock absorbing effects can be applied to the shock absorber. Can be granted.
Similarly to the first embodiment, the flat rings 18, 18 'and the crown ring 17 configured as shock absorbers are independent parts, and the relative positional relationship between the parts is not restricted. By the repeated compression and decompression operations of the shock absorber by the writing operation, a slight deviation occurs in the positional relationship between the portions where the flat rings 18 and 18 ′ and the projections 17 a and 17 b of the crown ring 17 abut. As a result, the portions where the flat rings 18 and 18 'and the projections 17a and 17b of the crown ring 17' come into contact with each other shift and a buffering effect is obtained on a new surface, so that an appropriate buffering force can be received again. As a result, the stress does not concentrate on the same position of the flat rings 18 and 18 ', which are elastic bodies, so that the elasticity of the shock absorber is unlikely to decrease and an appropriate shock-absorbing force can always be obtained. Further, when the flat rings 18 and 18 'are bent, the position of the center shaft set B in the outer cylinder 1 is changed, and a rattling sound is generated at the time of use. It is also possible to prevent the occurrence of a problem that the centering length is changed due to the pressing operation. In this embodiment, the flat rings 18 and 18 'are made of an elastomer. However, the flat rings may be made of an elastic member having a surface state that makes it more easily slipped from the crown ring. With such a configuration, it is easier to generate and increase the displacement of the contact portions of the flat rings 18 and 18 ′ with the projections 17 a and 17 b of the crown ring 17. And, since the stress is not concentrated on the same position of the flat ring 11 which is an elastic body by repeated compression and decompression operations of the shock absorber by the writing operation, the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock absorbing force is always provided. Can be obtained.
Further, the third embodiment of the present invention is characterized in that the flat rings 18 and 18 'and the crown ring 17 configured as shock absorbers are independent parts and can be easily divided. For this reason, the flat rings 18 and 18 ′ and the crown ring 17 are not only shifted by contact with the projections 17a and 17b of the crown ring 17 but also by removing the mouth portion 2. The positional relationship between the protrusions 17a and 17b can be directly changed. More specifically, the crown ring 17 is operated by operating the crown ring 17 in the rotational direction with respect to the flat rings 18 and 18 ′, or by operating the flat rings 18 and 18 ′ in the rotational direction with respect to the crown ring 17. It is possible to change the contact location to a new surface where the projections 17a, 17b are not in contact with the flat rings 18, 18 ', and as a result, an appropriate buffering force can be obtained again without any problems. Can be used. Further, since the flat rings 18 and 18 'and the crown ring 17 constituting the shock absorbers are independent parts, all the surfaces of the flat rings 18 and 18' described above are plastically deformed and the elasticity is lowered. Even in this case, an appropriate buffering force can be obtained again by a simple operation of replacing only the flat rings 18 and 18 ', which are elastic members, with new ones, which is very convenient for the user.

  Next, although not shown, the configuration of the fourth embodiment of the present invention will be described. The description of the same configuration as in the first embodiment is omitted. In the fourth embodiment, unlike the first to third embodiments, when the shock absorber is operated by writing pressure, the relative positional relationship between the flat ring and the crown ring configured as the shock absorber is rotated by the cam mechanism. It is characterized in that it changes with respect to the direction. The cam mechanism is provided with a rotating cam mechanism on the inside of the tip and on the outer peripheral surface of the crown ring, and utilizes the retreating operation in the axial direction of the shock absorber by writing pressure, and at that time, only the crown ring is rotated. Is. In addition, as a configuration for rotating only the crown ring by utilizing the backward movement of the shock absorber in the axial direction by another writing pressure, for example, a rotating cam mechanism is provided on the inner peripheral surface of the crown ring and the outer peripheral surface of the cushion sleeve. May be.

Next, the operation of this embodiment will be described. As described above, in this embodiment, the rotating cam mechanism is provided on the inside of the tip portion and on the outer peripheral surface of the crown ring. For this reason, when the member provided with the pressure-sensitive part receives the writing pressure, the shock absorber retracts with respect to the axial direction by the pressure, but the crown ring in the shock absorber is provided inside the mouth portion together with the retreating operation. A revolving operation and a rotating operation are performed along the cam surface. That is, since the position of the protrusion of the crown ring moves while rotating in a certain direction on the flat ring, the relative positional relationship between the flat ring and the crown ring changes with respect to the rotation direction each time a writing operation is performed. Because of this rotational movement, the crown ring's protrusion will come into contact with a new surface that was not in contact with the flat ring every time it is written, so it is possible to always obtain an appropriate buffering force and use it without any problems. I can do it.
Further, similarly to the first embodiment, the flat ring and the crown ring configured as the shock absorbers are independent parts and can be easily divided. For this reason, even if all the flat ring surfaces described above are plastically deformed and the elasticity is reduced, an appropriate cushioning force can be obtained again by simply replacing the flat ring, which is an elastic member, with a new one. Since it can be obtained, it is very convenient for the user.
Further, as a modification of the fourth embodiment, for example, a material having a surface state in which the flat ring can easily slip with the crown ring may be used. In that case, since the crown ring can be easily slipped with respect to the flat ring, the displacement of the contact portion with the projection of the crown ring can be easily generated and increased. Even when the buffering distance with respect to the direction is not sufficient and the rotation angle by one buffering operation is insufficient, it can be effectively used as a buffering device.

Next, the structure of 5th Embodiment of this invention is demonstrated based on drawing of FIG.15, FIG.16, FIG.17. 15, FIG. 16, and FIG. 17 all show the state in which the tip of the core protection tube 21 and the writing core P are flush with each other and in the unused state (the state before writing).
The mechanical pencil D according to the fifth embodiment of the present invention has a shaft cylinder, and the shaft cylinder includes an outer cylinder 19 and a mouth portion 20 attached to the outer cylinder 19. A slider set E is attached to the inside of the tip 20 so as to be slidable in the axial direction of the tip 20, and the slider set E includes a core protection tube 21, a slider 22, a core holding member 23, and an O-ring. 24. In the slider set E, a core protection tube 21 is disposed in front of the slider 22, and a rubber core holding member 23 that functions as a detent of the writing core P in the slider 22 and behind the core protection tube 21. Further, an O-ring 24 is externally fitted at the approximate center of the outer periphery of the slider 22.
Further, inside the mechanical pencil D, an intermediate shaft set (cursive body) F is disposed.
The center shaft set F includes a chuck 25, a chuck ring 26, a chuck release ring 27, a core 28, a chuck spring 29, a relay 30, and a lead tank 31, and constitutes a lead feeding mechanism (writing lead projecting means). doing. A flat ring 33 is disposed between the rear end surface of the flange 32a of the cushion sleeve 32 and the front end surface of the outer cylinder 19 screwed in front of the core 28 of the center shaft set F built in the mechanical pencil D. The projection 19a (corresponding to the projection of the crown ring in the above embodiment) formed at the front end of the outer cylinder 19 forms a shock absorber.
Further, an eraser receiver 35 for supporting the eraser 34 is attached to the rear end portion of the lead tank 31 so as to be detachable from the lead tank 31, and a cap 36 covering the eraser 34 is attached to the lead tank 31. On the other hand, it is configured to be detachable. Further, a clip 37 is attached to the rear end portion of the outer cylinder 19.

The above is the configuration of the present embodiment, but each member constituting the fifth embodiment including each unit will be described in detail.
The outer cylinder 19 has a cylindrical shape, has a reduced diameter portion 19b formed in the front portion on the outer periphery, and further has a male screw portion 19c formed on the outer periphery thereof. Further, since the front end surface of the outer cylinder 19 is used as an indenter member for crushing the flat ring 33, the front end surface is formed with a projecting portion 19a having a substantially quadrangular prism radially. Here, when the flat ring 33 is crushed, the corner of the surface of the projection 19a that abuts on the flat ring 33 may be square, but in the fifth embodiment, the flat ring 33 is formed by a curved surface. When 33 is crushed, the surface of the flat ring 33 that receives stress increases along with the crushing, and the stress applied to the flat ring 33 at the time of crushing is dispersed, and the effect of further reducing the elasticity is obtained. Moreover, in 5th Embodiment, the protrusion part 19a is formed in four places so that it may become equal intervals every 90 degree | times on the periphery of the outer cylinder 19 front end surface. In practice, it is only necessary that at least two protrusions 19a are formed at equal intervals on the circumference of the front end surface of the outer cylinder 19. This is because, for example, when it is formed only at one place, the flat ring 33 is supported in a cantilevered state by the projection 19a. Depending on the position of the projection 19a at the time of writing, it may be appropriate. This is because the buffer effect cannot be obtained.
In addition, a plurality of stepped portions are formed together with a cylindrical hole (inner hole) inside the tip 20, and the inner hole is formed from an inner hole 20 a having a maximum inner diameter formed at the end of the tip 20, An inner hole 20b, an inner hole 20c, and a core protection tube sliding hole 20d are formed so that the inner diameter gradually decreases toward the front of the tip 20. The sleeve receiving step 20e is formed as a step formed by the inner hole 20a and the inner hole 20b, and the slider receiving step 20f is formed as a step formed by the inner hole 20c and the core protection tube sliding hole 20d. Yes. And about the inner hole 20b and the inner hole 20c, in order to improve a moldability by making the tip part 20 into substantially constant thickness, the radial groove | channel 20g is formed in the internal peripheral surface of each inner hole. Furthermore, a female screw portion 20h is formed in the inner hole 20a of the tip portion 20 from the substantially middle portion to the rear, and is screwed with a male screw portion 19c formed on the outer peripheral portion of the outer cylinder 19 reduced diameter portion 19b. And the outer cylinder 19 and the front-end | tip part 20 are fixed. In addition, as a fixing method of this outer cylinder 19 and the tip part 20, you may carry out press-fit fixation without providing a screw part, or you may make it engage / disengage.
Further, the core protection tube 21 is slidably disposed with respect to the core protection tube sliding hole 20d of the tip portion 20, and the slider 22 is slidably disposed with respect to the inner hole 20c. The slider set E is slidable in the axial direction inside the tip portion 20. An O-ring 24 is externally fitted to the slider 22 of the slider set E, and the outer diameter of the O-ring 24 when the O-ring 24 is externally fitted to the slider 22 is set larger than the inner diameter of the inner hole 20c. Therefore, when the slider set E slides in the tip 20, it receives a sliding resistance due to friction. The material used for the O-ring 24 may be an elastic resin, and specific examples include nitrile butadiene rubber, silicone rubber, and fluorine rubber. Further, in the present embodiment, since the slider set E only needs to be able to impart a resistance force to the tip 20 when sliding, the slider 22 and the inner hole 20c may be in direct contact with each other. The slider set E in the present embodiment includes the core protection tube 21, the slider 22, the core holding member 23, and the O-ring 24. However, the present invention is not limited to this, and for example, a plurality or all of the components are included. It may be formed as an integral part. When it is formed as an integral part and a highly rigid material such as resin or metal is selected, the shape is elastic to provide the functions of the core holding member 23 and the O-ring 24 formed by an elastic member. What is necessary is just to make it a deformable form. Even when the material is integrally formed as an elastic member, the functions of the core holding member 23 and the O-ring 24 are not impaired in the form of the fifth embodiment. Can be appropriately selected.
Further, the outer shape of the core holding member 23 in the slider 22 is a cylindrical shape whose front is smaller in diameter than the rear, and a core insertion hole 23a for holding the writing core P is formed in the center thereof. Has been. Here, the leading end of the lead protection tube 21 and the writing lead P are made smaller by reducing the sliding resistance force that the slider 22 is accommodated in the tip 20 than the gripping force by which the lead holding member 23 holds the writing lead P. When writing in a flush state, the writing core P is retracted by the writing pressure, and at the same time, the leading end portion of the core protecting tube 21 comes into contact with the paper surface and the core protecting tube 21 is retracted. Thereafter, when the input of the writing pressure is released, the writing core P moves forward, but the sliding resistance force against the lip 20 of the slider 22 is smaller than the frictional force between the writing core P and the core holding member 23. The lead protection tube 21 advances with the advancement of the writing lead P. Therefore, even after the retreating operation with respect to the axial direction of the shock absorber by the writing pressure, the tip of the core protection tube 21 and the writing core P can be maintained in a flush state, so that the core is not easily broken during writing. In the present embodiment, the O-ring 24 is fitted on the outer peripheral surface of the slider 22, but the O-ring 24 may not be provided. Specifically, the shape of the outer peripheral surface of the slider 22 may be a flat shape. In addition, circumferential grooves and circumferential protrusions may be formed at equal intervals on the plane. Alternatively, protrusions extending in the axial direction may be radially arranged on the surface of the slider 22 at equal intervals. In short, when the slider set E and the lip portion 20 slide, the center axis of the slider 22 and the lip portion 20 may not be displaced, or the slider 22 may not be laterally shaken or loose. In addition, when the clogging has occurred, the tip 20 may be removed from the outer cylinder 19 in order to remove the wick. When the sliding resistance force when the slider set E slides in the tip 20 is extremely small, the slider set E may fall from the tip 20 and be lost. Therefore, a protrusion or rib for preventing detachment may be provided behind the slider set E on the inner surface of the inner hole 20c of the tip portion 20. Alternatively, when the slider set E is clogged, the slider set E can be removed from the lip 20 to remove the lead, and the slider set E will not be accidentally detached and lost. In addition, on the inner surface of the inner hole 20c of the tip 20 and on the rear side of the slider set E, protrusions and ribs that can be detached from the tip 20 may be provided.
On the other hand, the sliding resistance force in which the slider 22 is accommodated in the lip 20 can be made larger than the gripping force with which the core holding member 23 grips the writing core P. In this case, in a state where the writing core P protrudes from the tip of the core protection tube 21, the writing core P is retracted into the core protection tube 21 before the slider 22 is retracted into the tip 20 by the shock absorber. The centering amount from the core protection tube 21 can be shortened. As a result, it is difficult for the lead to break even during writing, and furthermore, writing can be performed with the writing lead P protruding from the tip of the lead protection tube 21, and writing can be performed while looking at the contact area between the paper surface and the writing lead P during writing.

As described above, the middle shaft set F includes the chuck 25, the chuck ring 26, the chuck release ring 27, the core 28, the chuck spring 29, the relay 30, and the core tank 31.
The chuck 25 has a substantially cylindrical shape, and has a large-diameter portion 25a at the front portion thereof, and a halved or tri-slit slit is formed on the outer periphery of the large-diameter portion 25a. It is made possible. The large diameter portion 25 a of the chuck 25 is surrounded by a cylindrical chuck ring 26, and the outer periphery of the large diameter portion 25 a is engaged with the inner periphery of the chuck ring 26. The rear side of the chuck 25 is press-fitted and fixed to the front end of the relay 30 having a cylindrical shape, and the relay 30 is formed with a large-diameter portion 30a having an enlarged diameter at an approximately middle portion of the outer peripheral surface thereof. . In the fifth embodiment, the rear of the relay 30 is press-fitted and fixed to the front end of the cylindrical core tank 31, but the relay 30 and the core tank 31 may be integrally formed. .
The core 28 has a substantially cylindrical shape, and is formed with a large-diameter portion 28a that is expanded from the middle portion of the outer diameter toward the rear. Further, a male screw portion 28b that engages with a female screw portion 32b of a cushion sleeve 32, which will be described later, is formed on the outer diameter portion of the core 28 from the large diameter portion 28a to the front, and the rear portion of the core 28 has a large diameter portion 28a. The end face is referred to as a chuck spring seat 28c. Further, an inner hole that is gradually reduced in diameter from the front end is formed in the inner diameter portion of the core 28, and an inner hole 28d, an inner hole 28e, and an inner hole 28f are formed in order from the front. Further, the step formed by the inner hole 28d and the inner hole 28e is called a chuck release ring seat 28g, and the step formed by the inner hole 28e and the inner hole 28f is called a chuck ring seat 28h.

As an assembling method of the middle shaft set F, the chuck ring 26 is inserted into the chuck 25 from the rear of the chuck 25, and the inner diameter portion of the chuck ring 26 is surrounded by the large diameter portion 25a of the chuck 25. Next, the rear side of the assembled chuck 25 is inserted into the front inner diameter portion of the relay 30 and fixed by press-fitting or caulking the front end portion of the relay 30. Further, the core 28 is inserted into the relay 30 from the rear, and one end of the chuck spring 29 is assembled to the chuck spring seat 28c of the core 28. The intermediate shaft set F is formed by press-fitting and fixing.
The chuck spring 29 pushes the core 28 forward by the biasing force, and the chuck ring seat 28h of the core 28 is in contact with the rear end surface of the chuck ring 26. Push out. When the chuck ring 26 is pushed forward, the large diameter portion 25a of the chuck 25 is surrounded, and then a force for pushing the chuck 25 forward acts. The chuck 25, the relay 30, and the core tank 31 are assembled. Because it is fixed, it is configured so that it cannot be pushed out any further. That is, since the chuck spring 29 is stretched between the chuck spring seat 28c of the relay 30 and the front end surface of the lead tank 31, the core 28 generates a force for pulling the chuck 25 through the chuck ring 26. Since the force that fixes the chuck 25, the relay 30, and the core tank 31 is stronger than the biasing force of the chuck spring 29, it does not operate any more and is fixed in that state.

A flat ring 33 is disposed between the rear end surface of the flange 32a of the cushion sleeve 32 and the front end surface of the outer cylinder 19 which are screwed in front of the core 28 of the center shaft set F built in the mechanical pencil D. A shock absorber is formed by a protrusion 19a (corresponding to the protrusion of the crown ring in the above embodiment) formed at the front end of the tube 19. The cushion sleeve 32 has a substantially cylindrical shape, and has a flange portion 32a having an enlarged diameter at a front end portion thereof, and a male screw portion 28b of the core 28 described above is disposed in the rear of the cushion sleeve 32. A female screw portion 32b is formed to be screwed together.
The flat ring 33 has a cylindrical shape, and may be a member (elastic member) made of a material that can be elastically deformed, such as elastomer, nitrile butadiene rubber, silicone rubber, or fluorine rubber. In addition, as another example, resin or metal that can be elastically deformed in shape may be used, and the shape is not limited to a cylindrical shape. For example, the cross section is a circular O-ring, or the cross section is irregular. It may be a ring.
Further, as described above, since the front end surface of the outer cylinder 19 is used as an indenter member for crushing the flat ring 33, the projections 19a having substantially square pillars are radially formed on the front end surface.

Since the flat ring 33 and the protrusion 19a on the front end surface of the outer cylinder 19 function as a shock absorber, the cylindrical flat ring 33 is inserted from the rear of the outer diameter part of the cushion sleeve 32 toward the flange, and the rear of the outer cylinder 19 The core 28 male screw portion 28b of the center shaft set F inserted from the end and the female screw portion 32b of the cushion sleeve 32 are assembled by screwing. In this state, the center shaft set F in which the shock absorber is assembled to the outer cylinder 19 is not fixed in the axial direction, and thus the female screw portion of the tip portion 20 in which the slider set E is built in this state. 20h is connected to the male screw portion 19c of the outer cylinder 19 by screwing. By doing so, the flange portion 32a and the flat ring 33 of the cushion sleeve 32 are sandwiched between the sleeve receiving step portion 20e of the tip portion 20 and the protrusion portion 19a formed at the front end portion of the outer cylinder 19, so that the shock absorber As a result, it is possible to obtain the effect.
At this time, the elastic force (biasing force) of the shock absorber formed by the flat ring 33 and the protrusion 19a formed at the front end portion of the outer cylinder 19 is the writing load applied to the writing surface by the writer. It is desirable to set as follows. The elastic force of the shock absorber can be adjusted as appropriate by adjusting the elastic force of the elastic member used for the flat ring 33 according to the material or hardness. Even when the material or hardness of the flat ring 33 is not changed, the flat ring 33 is appropriately adjusted by changing the contact area of the protrusion 19a formed on the front end portion of the outer cylinder 19 to be brought into contact with the flat ring 33. It is possible. In addition, the contact area of the protrusion formed on the front end portion of the outer cylinder 19 to be brought into contact with the flat ring 33 is changed. For example, when it is desired to increase the elastic force, the contact area may be increased. If it is desired to make it weaker, the contact area may be reduced. Further, in order to prevent the flat ring 33 from being deteriorated (reduced elastic force) by repeated use, it is necessary to make an appropriate selection based on the above configuration.

In order to obtain the mechanical pencil D, the eraser 34, the eraser receiver 35, and the cap 36 that covers the eraser 34 are assembled to the rear end portion of the lead tank 31 from the above configuration. This state becomes an unused state.
In addition, the rear end surface of the lip portion 20 abuts on the stepped portion of the outer cylinder 19 behind the male screw portion 19c to complete the screwing of the lip portion 20 and the outer cylinder 19. At this time, the outer tube 19 and the lip portion The flat ring 33 between 20 and the protrusion 19a formed at the front end of the outer cylinder 19 has no gap in the axial direction when the screwing is complete (the front end of the outer cylinder 19 It is desirable that the flat ring 33 is in contact with or slightly compressed by the formed protrusion 19a. This is because, for example, when the screwing is complete and there is a gap in the axial direction, the middle shaft set F in the mechanical pencil D is free in the axial direction by the gap. It is because it will be in a (slidable) state. When used in such a state, the mechanical shaft D in the mechanical pencil D slides due to the movement of the mechanical pencil D accompanying the writing operation, and vibrations are transmitted to the fingers or a rattling sound is generated. An annoying phenomenon occurs during writing, which hinders the user's writing.

Next, the lead feeding (writing core protrusion) operation in the fifth embodiment of the present invention will be described with reference to FIG. FIG. 18 shows a state after the leading end of the core protection tube 21 and the writing core P are flush with each other (FIG. 15) after pressing operation (core feeding operation) and protruding the core by 0.5 mm.
When the rear end portion of the cap 36 is pressed from the state shown in FIG. 15, the lead tank 31, the relay 30, the chuck 25, and the chuck ring 26 advance as the cap 36 advances. At that time, the core 28 and the cushion sleeve 32 assembled with the core 28 by screwing are in contact with the sleeve receiving step portion 20e of the mouth portion 20 at the front end portion of the flange portion 32a and do not advance further. Therefore, the chuck spring 29 stretched between the chuck spring seat 28 c of the core 28 and the front end surface of the lead tank 31 is compressed by the forward movement of the lead tank 31. Next, when the front end surface of the chuck ring 26 comes into contact with the chuck release ring 27 in the core 28, the chuck 25 advances relative to the chuck ring 26 and is stored while being reduced in diameter to the inner diameter portion of the chuck ring 26. The large diameter portion 25a of the chuck 25 that has been released is released and expanded, and the writing core P held inside the large diameter portion 25a is also released. At this time, the writing core P is held by the core holding member 23, and the advancement of the writing core P stops with the expansion of the large diameter portion 25a.
That is, the writing core P has an amount substantially equal to the distance traveled by the pressing operation until the chuck ring 26 advances and the front end of the chuck ring 26 contacts the rear end of the chuck release ring 27. It will be paid out. In addition, by arbitrarily designing the distance between the front end portion of the chuck ring 26 and the rear end portion of the chuck release ring 27, the length of feeding the core by one press can be freely set.
In the fifth embodiment, the pressing operation is performed by the front end surface of the chuck 25 coming into contact with the rear end portion of the slider 22 of the slider set E, and the slider 22 front end surface from that point is the slider stepped portion of the lip portion 20. This can be done until it slides to 20f and abuts.
When the pressing operation is released, the compressed chuck spring 29 is restored to its original state. Therefore, as the lead tank 31 is retracted, the components such as the relay 30, the chuck 25, and the chuck ring 26 are also retracted. . At this time, the chuck 25 moves backward, but the position where the writing core P protrudes from the tip of the core protection tube 21 is maintained by the frictional force between the writing core P and the core holding member 23. When the chuck 25 is retracted, the large-diameter portion 25 a comes into contact with the chuck ring 26, and the rear end surface of the chuck ring 26 comes into contact with the front end surface of the cushion sleeve 32. Thereafter, the large diameter portion 25 a of the chuck 25 is drawn into the chuck ring 26, and the large diameter portion 25 a of the chuck 25 is again surrounded by the chuck ring 26, and the large diameter portion 25 a of the chuck 25 grips the writing core P again.
The above is the feeding operation of the writing core P. For example, when the protruding amount of the writing core P from the tip of the core protection tube 21 is not sufficient, the operation of pressing the rear end of the cap 36 again is performed. It is possible to adjust the projection amount of the desired writing core P.

Next, the operation of the mechanical pencil when the writing core is subjected to writing pressure during writing will be described with reference to the drawings of FIGS. FIG. 19 is a front longitudinal sectional view showing a state in which the writing core of the mechanical pencil receives a writing pressure from the paper surface, and FIG. 20 shows an outer cylinder 19 and a cushion sleeve in a state in which the writing core of the mechanical pencil receives the writing pressure from the paper surface. 32, the external view of the flat ring 33 is shown.
From the state of FIG. 18, when the writing core P comes into contact with the paper surface and the writing core P receives the writing pressure, the chuck 25 that holds the writing core P receives the writing pressure. That is, when the writing core P receives the writing pressure, the writing pressure applied to the writing core P is also transmitted to the middle shaft set F including the chuck 25 holding the writing core P as shown in FIG. Between the front end surface of the outer cylinder 19 and the flange portion 32a of the cushion sleeve 32, a flat ring 33 configured as a shock absorber and a projection 19a on the front end surface of the outer cylinder 19 are interposed. When the pressure is applied, the shock absorber is gradually compressed to absorb the writing pressure, and the writing core P moves backward into the core protection tube 21. As the writing lead P moves backward, the slider set E in the tip 20 also tries to move backward through the lead holding member 23, but the slider set E has a greater O force than the friction force between the writing lead P and the lead holding member 23. Since the sliding resistance force generated in the ring 24 and the lip portion 20 is large, the slider set E stands by on the spot in the lip portion 20 and includes the chuck 25 holding the writing core P. Only F retreats inside the mechanical pencil D due to the writing pressure.
Here, the operation when the shock absorber receives the writing pressure will be described in detail. When a load in the backward direction due to the writing pressure is transmitted to the cushion sleeve 32, the cushioning device 32 is arranged at the rear end portion of the flange portion 32a. The provided flat ring 33 also tends to retreat by the collar portion 32a. Since the protrusion 19a on the front end surface of the outer cylinder 19 is in contact with the rear end surface of the flat ring 33, the flat ring 33 is retracted and the protrusion 19a on the front end surface of the outer cylinder 19 is used to move only the contact portion. Retreat while compressing.
By the above operation, the middle shaft set F moves back inside the mechanical pencil D. At this time, since the writing core P is gripped by the chuck 25 of the middle shaft set F, the middle shaft set F is interlocked with the middle shaft set F. , Retreat by the same distance. Further, the retreat distance in the fifth embodiment is preferably about 0.5 mm or less. This is because the writing core P feels in the core protection tube 21 at the time of writing if it is further retracted, which may lead to a sense of incongruity felt by the user, or when the writer writes the next character rather than the amount of retraction. Since it is necessary to perform writing with the tip of the writing core P largely separated from the paper surface, it becomes very difficult for the user to write. Therefore, it is desirable that the retraction distance of the writing core P is equal to or less than the protruding amount of the writing core P in one feeding operation. Further, as described above, the urging force of the shock absorber constituted by the flat ring 33 and the protrusion 19a on the front end surface of the outer cylinder 19 is set to be equal to or less than the writing load applied to the writing surface by the writer.
Here, when the shock absorber is constituted by the flat ring 33 and the protrusion 19a on the front end surface of the outer cylinder 19, a space portion is provided between the end surface of the flat ring 33 and the protrusion 19a on the front end surface of the outer cylinder 19. C is formed. The space portion C is provided to accommodate the volume deformation of the deformed flat ring 33 by compressing the flat ring 33 by the protrusion 19a on the front end surface of the outer cylinder 19 when the shock absorber is operated. Yes. For this reason, when the writing pressure is applied, the writing core P is immediately retracted into the core protector 21 while compressing the shock absorber, and the space portion C is retracted by the deformation of the flat ring 33. By changing the size of the space C in the shock absorber, the retreat amount (buffer amount) with respect to the axial direction can be freely set.
In addition, as the buffering effect, writing can be performed with a soft feel, and since a sudden strong force is not applied to the writing core P at the start of writing, a core breakage preventing effect is obtained, and the writing surface is also strong. There is no trace of pressure (a trace in which the paper surface is recessed by a writing operation). Furthermore, since the writing lead P protruding from the tip of the lead protection officer 21 moves back into the lead protection officer 21 due to the buffering effect, the protruding amount can be shortened, and the writing lead P becomes more difficult to break.
Although not provided in the fifth embodiment, it is also possible to add a device for adjusting the load to be buffered with respect to the shock absorber, for example, the first stroke on the writing surface (the first stroke) ), The load at the start of buffering is reduced by reducing the depth of the protrusion on the front end surface of the outer cylinder 19 with respect to the flat ring 33 that is in contact with the shock absorber. You may make it the structure which can write in. In addition, as a device for adjusting the load to be buffered with respect to the shock absorber, the shock absorber and the cushion sleeve 32 are arranged in the gap where the outer cylinder 19 and the tip 20 are screwed together. Therefore, for example, a mechanism that can adjust the distance in the axial direction by screwing the outer cylinder 19 and the tip 20 may be used, or the crushing distance of the shock absorber may be adjusted by another member that can be operated from the outside of the outer cylinder 19. A possible mechanism (buffer load adjusting mechanism) may be used.
Further, the fifth embodiment is characterized in that the core protective tube 21 is not fixed to the tip 20 unlike the first to fourth embodiments. That is, even if it is accidentally dropped from the tip of the core protection tube 21, the impact force at the time of dropping can be suppressed by the buffer device, and the core protection tube 21 is not fixed to the mouth portion 20. As a result, the core protection tube 21 is accommodated in the tip 20 due to the impact, and therefore there is a possibility that the core protection tube can be prevented from being damaged. Further, with the above-described configuration, in a normal mechanical pencil, writing continues until the writing core P protruding from the tip of the core protection tube 21 is consumed by the writing operation (until the writing core P becomes flush with the core protection tube 21). In the present embodiment, writing can be continued until the lead protection tube 21 is retracted to the front end face of the lip 20 by writing. More specifically, the centering amount of the writing core P protruded from the tip of the core protection tube 21 by the writing operation is consumed due to friction with the paper surface, and more than the retraction amount (buffering amount) of the core due to the writing pressure described above. When writing continues in a reduced state, the leading end of the lead protection tube 21 comes into contact with the paper surface after the writing lead P is retracted into the lead protection tube 21 by the pressure of the writing, so that the lead protection tube 21. The slider set E receives a force in the backward direction via the. The frictional force of the slider set E with respect to the lip portion 20 is set to be larger than the frictional force between the writing core P and the core holding member 23 but smaller than the writing pressure. The slider set E moves backward until the writing lead P moves backward by the buffer amount. Therefore, writing can be continued in a state where the writing core P and the core protection tube 21 are simultaneously in contact with the paper surface until the core protection tube 21 is retracted by writing to the front end surface of the lip 20. For this reason, especially when the writing core P with a small diameter is used, the amount of wear of the writing core P due to writing is remarkable, so that frequent knocking operations are forced. Since it is possible to continue writing until the front end surface of the section 20 is retreated by writing, it is not necessary to perform knocking frequently, and the dissatisfaction can be solved.
In the present embodiment, the mechanical pencil core is disposed in the core protection tube. However, the present invention is not limited to this, and a solid drawing material, an eyeliner, a lipstick, or the like may be disposed as described later.

Next, the operation when the input of writing pressure is canceled will be described. When the input of the writing pressure is released, the rear end surface of the cushion sleeve 32 is advanced by the restoring force of the flat ring 33 of the shock absorber compressed by the input of the writing pressure, so that it is retracted together with the input of the writing pressure. The middle shaft set F also moves forward together. The intermediate shaft set F moves forward in the mechanical pencil D by the above-described releasing operation of the writing pressure. At this time, since the writing core P is gripped by the chuck 25 of the intermediate shaft set F, the intermediate shaft set F is interlocked with the intermediate shaft set F. Move forward by the same distance and restore to the unused state. Therefore, at this time, the user can be given a feeling that the writing core P has been sent out.
The writer writes characters such as kanji, hiragana, katakana, alphabets and numbers, and draws a picture, but repeats the action of bringing the lead into contact with the writing surface and releasing the lead for each stroke or stroke. Things are common, and the beginning and end of writing are frequently repeated. Accordingly, since the flat ring 33 of the shock absorber expands and contracts every time writing is started and finished, the shock absorbing force is received each time.

Here, in the fifth embodiment, an outer cylinder 19 and a middle shaft set F disposed in the outer cylinder 19 are provided, and the middle shaft set F is provided with a cushion sleeve 32 in which a flange portion 32a is formed. A mechanical pencil provided with a shock absorber for urging the cushion sleeve 32 of the center shaft set F forward, and when the writing core receives pressure during writing, the flat ring 33 of the shock absorber is deformed, and the flat ring The writing core P is moved backward while receiving the resilience of 33, and the writing core P moves forward by releasing the writing pressure.
Therefore, the forward and backward movements by the writing operation described above are repeatedly performed, so that the flat ring 33 of the shock absorber repeatedly performs the compression and restoration operations at substantially the same location by the protrusion 19a on the front end surface of the outer cylinder 19. Sag may occur. In addition, depending on the user, a load that is outside the assumed range is applied when the writing core P protrudes from the inside of the core protector 21 and receives an impact such as a drop, and the flat ring 33 It may be plastically deformed, and the function as a shock absorber may be impaired, and the intended writing feeling may be impaired.
However, in the present embodiment, the flat ring 33 configured as a shock absorber and the protrusions on the front end surface of the outer cylinder 19 are independent parts, and the relative positional relationship between the parts is not restricted. Due to repeated compression and decompression operations of the shock absorber by the writing operation, a slight shift occurs in the positional relationship between the locations where the flat ring 33 and the projection 19a on the front end surface of the outer cylinder 19 abut. As a result, the place where the flat ring 33 and the protrusion 19a on the front end surface of the outer cylinder 19 come into contact with each other shifts and a buffering effect is obtained on a new surface, so that an appropriate buffering force can be received again. As a result, stress does not concentrate on the same position of the flat ring 33, which is an elastic body, so that the elasticity of the shock absorber is unlikely to decrease, and an appropriate shock-absorbing force can always be obtained. Further, when the flat ring 33 is bent, the position of the center shaft set F in the outer cylinder 19 is changed, and a rattling sound is generated during use, causing a troublesome phenomenon for the user, or pressing operation of the cap 36. It is also possible to prevent problems such as the centering length from changing. In this embodiment, the flat ring 33 is made of an elastomer. However, the flat ring 33 may be an elastic member made of a material that has a surface state that is more easily slipped from the protrusion 19a on the front end surface of the outer cylinder 19. With such a configuration, the displacement of the contact portion of the flat ring 33 with the protrusion 19a on the front end surface of the outer cylinder 19 can be more easily generated and increased. Since the stress is not concentrated at the same position of the flat ring 33 which is an elastic body due to repeated compression and restoration operations of the shock absorber by the writing operation, the elastic force of the shock absorber is unlikely to decrease, and an appropriate shock absorbing force is always provided. Can be obtained.
Further, the fifth embodiment of the present invention is characterized in that the flat ring 33 configured as a shock absorber and the protrusion on the front end surface of the outer cylinder 19 are independent parts, and can be easily divided. . For this reason, the flat ring 33 and the projection 19a on the front end surface of the outer cylinder 19 are removed not only by shifting the contact position of the flat ring 33 with the projection 19a on the front end surface of the outer cylinder 19 but also by removing the tip portion 20. It is also possible to directly change the positional relationship.
More specifically, the protrusion 19 a on the front end surface of the outer cylinder 19 is not in contact with the flat ring 33 by operating the flat ring 33 in the rotation direction with respect to the protrusion 19 a on the front end surface of the outer cylinder 19. It is possible to change the contact location on the new surface, and as a result, an appropriate cushioning force can be obtained again and it can be used without any problems. Further, since the flat ring 33 configured as a shock absorber and the outer cylinder 19 on which the projections 19a are formed have independent parts, all the surfaces of the flat ring 33 described above are plastically deformed, resulting in reduced elasticity. Even in this case, an appropriate buffering force can be obtained again by a simple operation of replacing only the flat ring 33, which is an elastic member, with a new one, which is very convenient for the user.

  In the above fifth embodiment, the mechanical pencil is taken as an example, and the medium shaft set F as the member provided with the pressure sensitive part and the pressure sensitive part as the writing core P have been described. However, the present invention may be used as long as it is pressed against the writing surface, and the one corresponding to the writing core P is worn by writing, particularly for a solid drawing material, eyeliner, lipstick, etc. Can be used. Here, in the case of writing instruments, the writing surface refers to the surface on which the writing instrument can be written without being limited to the paper surface, etc. It refers to the surface that is applied to or written on the human body. In the case of a writing instrument, examples of the writing core of the writing body include a drawing core in a solid drawing material in addition to the mechanical pencil core described in the examples. In the fifth embodiment, since the core protection tube is also retracted simultaneously with writing, the outer diameter portion of the drawing core is the core protection tube even when a soft material core such as the drawing core is used. Since it is protected inside, it can be expected to prevent the core from breaking due to an external impact. On the other hand, when a core such as a mechanical pencil is used, the cross-sectional shape is not limited to a circle, and a square shape or an irregular shape can be used. Regardless of the writing instrument, or especially those with a hard tip member, the writing body (writing core, tip member) is surely retracted by contact with the writing surface, so that the impact load at the start of use is released. Core breakage can be prevented, and writing can be performed with a soft feel. In addition, especially when using a cursive body with a hard tip on the human body, etc., the conventional hard writing feeling will be soft, and there will be features such as reduced pain when writing with a hard tip, It becomes an excellent container.

A Mechanical pencil B Medium shaft set (cursive)
C space part D mechanical pencil E slider set F medium shaft set P writing core 1 outer cylinder 1a reduced diameter part 1b male screw part 2 mouth part 2a core protection tube press-fitting hole 2b inner hole 2c inner hole 2d inner hole 2e inner hole 2f chuck ring Release step portion 2g Sleeve receiving step portion 2h Female screw portion 3 Core protective tube 4 Core holding member 4a Core insertion hole 5 Chuck 5a Large diameter portion 6 Chuck ring 7 Cushion sleeve 7a Hook portion 7b Relay slide hole 7c Chuck slide hole 7d Chuck spring seat 8 Chuck spring 9 Relay 9a Large diameter part 10 Core tank 11 Flat ring 12 Crown ring 12a Protrusion 12 'Crown ring 12a' Protrusion
13 Eraser Receiving 13a Outer Side 14 Eraser 15 Cap 16 Crown Ring 16a Raised Part
16 'crown ring 16a' ridge
17 Crown ring 17a Protruding part 17b Protruding part 18 Flat ring 18 'Flat ring 19 Outer cylinder 19a Protruding part 19b Reduced diameter part 19c Male screw part 20 Mouth part 20a Inner hole 20b Inner hole 20c Inner hole 20d Core protective tube sliding hole 20e Sleeve receiving portion 20f Slider receiving portion 20g Groove 20h Female screw portion 21 Core protection tube 22 Slider 23 Core holding member 23a Core insertion hole 24 O-ring 25 Chuck 25a Large diameter portion 26 Chuck ring 27 Chuck release ring 28 Core 28a Large Diameter portion 28b Male screw portion 28c Chuck spring seat 28d Inner hole 28e Inner hole 28f Inner hole 28g Chuck release ring seat 28h Chuck ring seat 29 Chuck spring 30 Relay 30a Large diameter portion 31 Core tank 32 Cushion sleeve 32a Hook portion 32b Female screw part 3 3 Flat ring 34 Eraser 35 Eraser holder 36 Cap 37 Clip

Claims (5)

A container including a shaft cylinder, a member provided in the shaft cylinder and having a pressure-sensitive portion, and a shock absorber for biasing the member having the pressure-sensitive portion forward, the shock absorber The elastic member and an indenter member that crushes the elastic member, and a protrusion is formed on a surface of the indenter member that contacts the elastic member, and at least the elastic member of the shock absorber is an independent component. A container provided with a shock absorber. 2. The container having a shock absorber according to claim 1, wherein at least two protrusions are formed at equal intervals on a circumference of the indenter member. The container provided with the shock absorber according to claim 1 or 2, wherein the member including the pressure-sensitive portion is a cursive body. The shaft tube includes an outer tube and a tip portion attached to the outer tube, and the member including the pressure-sensitive portion includes a collar portion, and the member including the pressure-sensitive portion includes the outer tube and the 4. The shock absorber according to claim 1, wherein the shock absorber is disposed between the front end portion of the outer cylinder and the flange portion. A container provided with the shock absorber described in the paragraph. The shaft cylinder is composed of an outer cylinder and a tip portion attached to the outer cylinder, and a core protection tube slidable in the axial direction in the tip portion is disposed, and the pressure sensitive inside the core protection tube is provided. The container provided with the shock absorber according to any one of claims 1 to 4, wherein the portion can be moved forward and backward.

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