JPH11309984A - Rear end knocking type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a barrel cylinder and a pressing member from being disassembled by a method wherein a long groove is formed at an intermediate part of the barrel cylinder, and at the same time, a protuberance which slides in the long groove, and is elastically deformable in the inner diametrical direction, is formed on a pressing member, and in addition, the protuberance of the pressing member and the rear internal surface of the slide groove are made to come into contact on a slope. SOLUTION: At a rear part of a lead tank 8, an elastic protruberance 27 is formed. Then, on the side face of a barrel cylinder 1, a slide groove 28 is formed, and the elastic protuberance 28 is engaged with the slide groove 27. The elastic protuberance 27 is equipped with an elastic piece 29 which is formed by cutting the side part of the lead tank 8 into a U-shape, and a protruding part 30 which is formed at one end of the elastic piece 29. Also, in the protruding part 30 of the elastic protuberance 27, a slope 30a which tilts to the inside is formed, and the slope 30a is brought into contact and engaged with the retracted internal surface of the slide groove 28 of the barrel cylinder 1. By this constitution, when the lead tank 8 retracts, the slope 30a of the protruding part 30 of the elastic protuberance 27 is engaged with the rear end internal surface of the slide groove 28 of the barrel cylinder 1, and an outward force is applied to the elastic protruberance 27, and the lead tank 8 is prevented from jumping out from the barrel cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear end in which a pressing member urged rearward is slidably disposed on the inner surface of a shaft cylinder, and a writing body in the shaft cylinder protrudes and retracts by the forward and backward movement of the pressing member. It relates to a knock type writing instrument.

[0002]

2. Description of the Related Art An example is described in Japanese Patent Application Laid-Open No. Hei 7-205585. According to claim 1 of the claims of the publication, a chuck body is integrally provided on the cylindrical body, a chuck ring for opening and closing the chuck body is inserted into the chuck, and protrusions are provided on the cylindrical body and the chuck ring, respectively. The protrusions are respectively engaged with the engagement holes provided in the outer cylinder, a cap is provided at the rear of the cylinder, and the cylinder is biased rearward between the cap and the step provided on the inner wall of the outer cylinder. A rod-shaped material feeding container in which a rod-shaped material is held by a tip of an outer cylinder and a chuck through which an elastic body is inserted. It is described. More specifically, each protrusion is provided so as to be elastically deformable in the inner diameter direction,
The elastically deformable projections are elastically resilient,
It is in contact with the inner surface of the rear end of the engagement hole.

[0003]

However, in the above-mentioned prior art, when the elastic body has a strong elastic repulsion,
When the elastic deformation force of the protrusion has decreased, the protrusion is gradually deformed by the inner diameter method due to the elasticity of the elastic body, and finally the cylinder protrudes from the rear end of the outer cylinder. There was a thing. Further, when an excessive force is applied to the rod-shaped body during use, the above-described phenomenon may occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a pressing member urged rearward slidably disposed on the inner surface of a shaft cylinder. A rear-end knock-type writing instrument that protrudes and retracts a writing body in a shaft cylinder by forward and backward movement, and forms a long groove in an intermediate portion of the shaft cylinder, and forms a projection on the pressing member that slides in the long groove, The projection is elastically deformable toward the inner diameter direction, and further, when the pressing member moves backward, the projection of the pressing member and the rear inner surface of the sliding groove are formed on at least one of the inclined surfaces. The first point is that the contact is made, and a pressing member urged rearward is slidably disposed on the inner surface of the barrel, and the writing member in the barrel is protruded and retracted by the forward and backward movement of the pressing member. Rear end knock type writing implement, In addition to forming a groove, a protrusion that slides in the long groove is formed on the pressing member, and the protrusion is elastically deformable in the inner diameter direction, and further, the protrusion is formed at a position facing the protrusion. A second point is that the positions of the protrusions in the longitudinal direction are different from each other, and a pressing member urged rearward is slidably disposed on the inner surface of the barrel, and the front and rear of the pressing member A rear-end knock-type writing instrument that protrudes and disappears from the writing body in the barrel by movement,
Along with forming a long groove in the middle part of the shaft cylinder, forming a protrusion on the pressing member that slides in the long groove, and using the side of the protrusion as a fulcrum, the protrusion is elastically deformed. According to a third aspect, a rear-end knocking writing instrument in which a pressing member urged rearward is slidably disposed on the inner surface of the barrel, and a writing body in and out of the barrel is moved forward and backward by the pressing member. And forming a long groove in an intermediate portion of the barrel,
A protrusion that slides in the long groove is formed on the pressing member, and the protrusion is formed to be elastically deformable by forming at least two cuts on the pressing member, and has a length of the at least two cuts. The fourth gist is that they differ from each other.

[0005]

1 to 9 show an example. Inside the barrel 1, a center shaft 2 is disposed so as to be movable back and forth, and a leading end 3 is detachably fixed to the front end of the barrel 1 by screwing or the like. A center feeding mechanism 4 is disposed inside the center shaft 2, and a tip member 6 having a center detent member 5 is detachably fixed to a front end of the center shaft 2 by screwing or the like. . The center shaft 2 having the center feeding mechanism 4 is always urged rearward by the retracting spring 7. The lead-out mechanism 4 includes a lead tank (pressing member) 8 for storing a plurality of leads, a chuck body 9 fixed to the front end of the lead tank 8 for gripping / opening the lead, and opening / closing of the chuck body 9. , And a chuck spring 11 that constantly biases the lead-out mechanism 4 rearward to close the chuck body 9. In this example, the elasticity of the chuck spring 11 is set to be weaker than the elasticity of the spring 7.

On the other hand, a cam 1
Although 2 is formed, it may be formed of a separate member and fixed integrally to the barrel 1. The cam 12 is composed of a plurality of protrusions 13 formed radially in the vertical direction in the figure.
An inclined surface 14 is formed at the front end surface of the projection 13, and a chevron-shaped inclined surface 15 is formed at the rear end. A rotor 16 is fitted in the cam 12. A protrusion 17 is also formed on the outer peripheral surface of the rotor 16, and a chevron-shaped inclined surface 18 is formed on a front end surface of the protrusion 17, and an inclined surface 18 a is formed on a rear end surface thereof. And the rotor 16
Of the projection 13 formed on the cam 12
Or fitted into a groove 19 formed by the protrusion 13 and the adjacent protrusion 13. Rotor 16
When the projection 17 of the cam 12 is engaged with the projection 13 of the cam 12, the rotor 16 is in the forward state, and the projection 17 is
, The rotor 16 is in a retracted state. Here, since the rear end of the center shaft 2 is in contact with the rotor 16 (the contact portion 20), when the rotor 16 is in the forward state, the core feeding mechanism 4 projects from the front end of the shaft cylinder 1. State, and when the rotor 16 is in the retracted state, it is in the retracted state.

Behind the rotor 16, a hollow (hollow portion 21) slider 22 is provided with the shaft cylinder 1 and the center shaft 2.
It is arranged to be able to move back and forth with respect to. The slider 22
A projection 23 is also formed on the outer periphery of the projection 23, and a mountain-shaped inclined surface 24 is also formed on the front end face of the projection 23. A guide groove 25 is formed in the side surface of the slider 22 in the vertical direction. An elastic projection 27 formed behind the core tank 8 is slidably fitted in the guide groove 25. Further, the elastic projection 27 can also engage with a sliding groove 28 formed on the side surface of the barrel 1, and is prevented from falling off from the rear end of the barrel 1. The elastic projection 27 is composed of an elastic piece 29 formed by cutting a side portion of the core tank 8 into a U-shape (cut portion 8a) and a protrusion 30 formed at one end of the elastic piece 29. I have. The elastic piece 29 has a front portion serving as a connection portion with the core tank 8 and serves as a fulcrum P1 when the connection portion is elastically deformed. , And the connection at the rear thereof may be used as a fulcrum P2 (see FIG. 11:
Example). Also, inside the protrusion 30 of the elastic projection 27,
An inclined surface 30a that is inclined inwardly is formed so as to be able to abut and engage with the retreating inner surface of the sliding groove 28 of the shaft cylinder 1. An inclined surface may also be formed on the inner surface of the end, and the inclined surfaces may be brought into contact with each other so as to bite by making surface contact.

The rear end of the slider 22 protrudes from the rear end of the barrel 1, and the amount of protrusion is the amount by which the center shaft 2 projects from the tip of the barrel 1. Slider 2
A vertical groove 22a in which the protrusion 30 of the elastic projection 27 slides is formed at a position where the side surfaces of the two oppose each other. That is,
The protrusion 30 of the elastic projection 27 penetrates the vertical groove 22 a of the slider 22 and fits into the slide groove 28 of the barrel 1. A pressing body 31 is located inside the protruding portion of the slider, and the pressing body 31 is detachably fitted to the rear end of the core tank 8. That is, the pressing body 31
Is an operation member for operating the lead mechanism. Reference numeral 32 denotes an eraser, which is pressed into the rear end of the core tank 8. Reference symbol S is a coil spring that is stretched between the core tank 8 and the slider 22 and acts in a direction to separate each other.

[0009]

When the lead tank 8 is retracted, it is urged further backward by the retractable spring 7, but the inclined surface 30a of the projection 30 of the elastic projection 27 is formed on the inner surface of the rear end of the sliding groove 28 of the barrel 1. Since they are engaged, an outward force acts on the elastic projection 27.

Next, the center shaft 2 is advanced, and the tip member 7 is moved.
An operation of causing the shaft barrel 1 to protrude from the leading tool 3 will be described. In the state shown in FIG. 1, the pressing body 31 and the rear end of the slider 22 are pressed forward by a finger pad or the like. By this pressing operation,
The rotor 16, the center shaft 2, the center feeding mechanism 4 and the like move forward against the elasticity of the chuck spring 12 and the spring 8. At this time, the rotor 16 is advanced by the slider 22 and is rotated by the engagement between the angled inclined surface 24 of the slider 22 and the angled inclined surface 18 of the rotor 16. The angled inclined surface 16 is engaged with the inclined surface 15 of the cam 13 (see FIG. 4), whereby the tip member 6 of the center shaft 2 projects from the leading tool 3 of the barrel 1. Here, when the finger is released from the pressing body 26 and the rear end of the slider 22 (when the pressing operation is released), the pressing body 26 retreats by the elastic force of the chuck spring 11. At this time, since the slider 22 is locked in a state where the rotor 16 is advanced, the retracting action does not reach the slider 22, and the pressing body 26 is moved from the rear end of the slider 22. It will be in a protruding state (see FIG. 8). At this time, the slider 22 is movable between the rotor 16 and the rear end of the barrel 1, but the slider 22 and the rotor 16 are Since it is held by a slight force of engagement with 22a, it does not move easily.

Next, the operation of extending the lead will be described. From the protruding state, the pressing body 26 is pressed by the belly of the finger or the like until the belly of the finger touches the rear end of the slider 22. When the belly of the finger touches, the pressing operation is released. By this pressing operation, the core tank 8 is pressed and advanced, and the chuck body 9 is also advanced against the elasticity of the chuck spring 11. Then, the lead is advanced with the advance of the chuck body 9 and is drawn out from the tip member 6.

Next, the center shaft 2 is retracted, and the tip member 6 is moved.
An operation of immersing in the leading tool 3 of the barrel 1 will be described.
The pressing body 31 is pressed by the belly of the finger from the protruding state. When this pressing operation is continued, the belly of the finger eventually swings to the rear end of the slider 22 as described above. Here, if the pressing operation is further continued, the slider 22 is also pressed, and the pressing and forward movement of the slider 22 causes the rotor 1 to move forward.
6 also advances and rotates. When the rotor 16 rotates, the engagement between the angled inclined surface 18 of the rotor 16 and the inclined surface 15 of the cam 13 is released, and the projection 17 on which the angled inclined surface 18 is formed is inserted into the groove of the cam 13. Located at 19. At this time, the rotor 22 retreats along the groove 19 due to the elasticity of the spring 7, and the tip member 6 enters the tip 3.

Incidentally, in the lead-out mechanism 4 of this embodiment,
When immersed in the barrel 1, the core tank 8 is relatively pressed, and the chuck body 9 is in an expanded state. At the time of immersion, the core is always stored (see FIG. 1).

Next, the assembling method will be described with reference to FIGS.
Explanation will be made based on 0. A general writing instrument for making a writing body protrude and retract by a rotary cam mechanism (a so-called debit cam type) is composed of a core feeding mechanism, a rotor, a slider, and the like assembled from a front end of a shaft cylinder, and then a rear end of the shaft. The pressing member is assembled from the end. However, in this example, first, the center shaft 2 having the center feeding mechanism 4 is assembled, and in this state, the rotor 16, the retractable spring 7, and the slider 22 are assembled to the center tank 8. That is, all the internal mechanisms arranged inside the barrel 1 are assembled in advance.
Then, the internal mechanism is inserted from behind the barrel 1 (FIG. 9).
At this time, the elastically deformable protrusion 2 of the core tank 8 is used.
7 (30) is inserted while narrowing inward (see FIG. 10),
The shaft cylinder 1 is engaged with the sliding groove 28. The assembly is completed by the engagement of the projection 27 with the sliding groove 28 (see FIG. 1). Here, when inserting the internal mechanism into the barrel, there is a concern that the front end face of the rotor 22 abuts on the rear end of the cam surface 12 and the insertion is prevented. Since the angled inclined surfaces 15 and 18 are formed on the rear end surface (see FIGS. 2 and 6), the rotor 16 is positioned while rotating, and is easily inserted without being hindered.

A third example will be described with reference to FIGS.
This is an example in which the formation positions of the elastic projections in the longitudinal direction are different. The details will be described below. The elastic projections 33 and 34 are formed at two opposing positions as in the previous example, but have different longitudinal lengths. Specifically, the length of the elastic projection 33 on the left side in the figure is long, and the elastic projection 3 located on the right side is
4 is formed short. And, along with this, the barrel 1
Of the elastic projections 33 and 34
The formation positions of the sliding grooves 37 and 38 in which the slides 5 and 36 slide are also two opposing positions, but the formation positions in the longitudinal direction are different. By making the lengths of the elastic projections 33 and 34 different, the angle of refraction of the elastic projections during assembly can be increased (see FIG. 13), and as a result, the height of the projections can be increased. , Sliding groove 3 of shaft cylinder 1
The engagement ratio with the shaft 7 is also increased, so that the lead tank can be prevented from protruding from the rear end of the barrel.

A fourth example will be described with reference to FIG. It is a modification of the elastic projection. The elastic projection 39 of the present example is formed in a direction perpendicular to the longitudinal direction of the core tank 8.
Specifically, a side portion of the U-shaped elastic projection 39 is a connecting portion 40 with the core tank 8, and the connecting portion 40 also serves as a fulcrum for elastic deformation. By setting the fulcrum where the elastic projection 39 is deformed to be the side portion, the urging force applied to the elastic piece 41 or the projection 42 of the elastic projection 39 such as a writing pressure or a spring can be dispersed to the connecting portion 40,
Therefore, deformation of the elastic projection 39 in the inner diameter direction can be prevented as much as possible.

A fifth example will be described with reference to FIG. The elastic projections 43 of this example are formed in a direction parallel to the longitudinal direction of the core tank 8 as in the second example, but the cut lengths of the cut portions 8a are different. . Specifically, the cut length of the cut portion 8b on the left side in the figure is long,
The length of the cut portion 8c on the right side is reduced. The urging force applied to the elastic projection 43 such as the writing pressure or the spring is applied to the fulcrum formed at an oblique angle (the connecting portion 4 with the core tank 8).
4), the deformation of the elastic projection 43 in the inner diameter direction can be prevented as much as possible.

[0018]

According to the present invention, a rear-end knocking type in which a pressing member urged rearward is slidably disposed on the inner surface of a barrel, and a writing body in the barrel is protruded and retracted by forward and backward movement of the pressing member. A writing instrument, wherein a long groove is formed in an intermediate portion of the barrel,
A projection that slides in the long groove is formed on the pressing member, and the projection is elastically deformable in an inner diameter direction. Further, when the pressing member moves backward, the projection slides on the pressing member. The first gist is that the rear inner surface of the moving groove is brought into contact with the inclined surface formed on at least one side, and a pressing member urged rearward is slidably disposed on the inner surface of the barrel. A rear-end knock-type writing instrument that protrudes and retracts a writing body in the barrel by a forward and backward movement of the pressing member, wherein a long groove is formed in an intermediate portion of the barrel, and the protrusion that slides in the long groove is pressed. Formed on a member, and the protrusion is elastically deformable in the inner diameter direction,
The second point is that the protrusions are formed at opposing positions, and the positions of the protrusions in the longitudinal direction are different from each other, and the pressing member urged rearward on the inner surface of the barrel is slidable. A rear-end knock-type writing instrument which is disposed at the center of the barrel and which protrudes and retracts a writing body in the barrel by the forward and backward movement of the pressing member, wherein the projection forms a long groove in an intermediate portion of the barrel and slides in the long groove. Is formed on the pressing member, and the side of the projection is used as a fulcrum, and the projection is elastically deformed as a third aspect. The pressing member is urged rearward on the inner surface of the barrel. Slidably arranged, a rear-end knock-type writing instrument that protrudes and retracts a writing body in the shaft cylinder by forward and backward movement of the pressing member, wherein a long groove is formed in an intermediate portion of the shaft cylinder, and the inside of the long groove is formed. Forming a sliding projection on the pressing member,
The projection is formed so as to be elastically deformable by forming at least two cuts in the pressing member, and the fourth gist is that the lengths of the at least two cuts are different. Decomposition with the member can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the present invention (at the time of immersion).

FIG. 2 is a front view of a main part showing a cam section of FIG. 1;

FIG. 3 is a perspective view showing a cam mechanism of the lead tank of FIG. 1;

FIG. 4 is a perspective view showing the slider of FIG. 1;

FIG. 5 is a perspective view showing the rotor of FIG. 1;

FIG. 6 is a development view of a cam mechanism.

FIG. 7 is a perspective view of a main part showing a core tank.

FIG. 8 is a longitudinal sectional view showing the present invention (when protruding).

FIG. 9 is a vertical sectional view of a main part showing an assembling method.

FIG. 10 is a vertical sectional view of a main part showing an assembling method.

FIG. 11 is a longitudinal sectional view of a main part showing a second example.

FIG. 12 is a vertical sectional view of a main part showing a third example.

FIG. 13 is a vertical sectional view of a main part showing an assembling method of a third example.

FIG. 14 is a front view of a main part of a core tank showing a fourth example.

FIG. 15 is a front view of a main part of a lead tank showing a fifth example.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 center shaft 3 leading tool 4 core feeding mechanism 5 connecting member 6 core detent member 7 tip member 8 retraction spring 9 core tank 10 chuck body 11 chuck ring 12 chuck spring 13 cam 14 protrusion 15 inclined surface 16 rotor 17 Projection 18 Angled inclined surface 19 Groove 20 Contact portion 21 Hollow portion 22 Slider 23 Projection 24 Angled inclined surface 25 Guide groove 26 Pressing body 27 Elastic projection 28 Sliding groove 29 Elastic piece 30 Projection 31 Pressing body 32 Eraser 33 Elastic projection 34 Elastic projection 35 Projection 36 Projection 37 Sliding groove 38 Sliding groove 39 Elastic projection 40 Connecting section 41 Elastic piece 42 Projecting section 43 Elastic projection 44 Connecting section

Claims (5)

[Claims] 1. A rear-end knocking writing instrument in which a pressing member urged rearward is slidably disposed on an inner surface of a barrel, and a writing body in the barrel is protruded and retracted by a forward and backward movement of the pressing member. ,
A long groove is formed in an intermediate portion of the shaft cylinder, and a projection that slides in the long groove is formed on the pressing member, and the projection is elastically deformable in an inner diameter direction. A rear-end knock-type writing instrument in which, when the member is moved rearward, a projection of the pressing member and an inner surface of a rear portion of the sliding groove come into contact with each other by an inclined surface formed on at least one side. 2. The rear-end knocking writing instrument according to claim 1, wherein a front side of a projection formed on the pressing member is used as a fulcrum, and the projection is elastically deformed. 3. A rear end knock type writing instrument in which a pressing member urged rearward is slidably disposed on an inner surface of a barrel, and a writing body in the barrel is protruded and retracted by forward and backward movement of the pressing member. ,
A long groove is formed in an intermediate portion of the shaft cylinder, and a protrusion that slides in the long groove is formed on the pressing member. The protrusion is elastically deformable in an inner diameter direction. Are formed at opposite positions, and the positions of the protrusions in the longitudinal direction are different from each other. 4. A rear-end knock-type writing instrument in which a pressing member urged rearward is slidably disposed on an inner surface of a barrel, and a writing body in the barrel is protruded and retracted by forward and backward movement of the pressing member. ,
A long groove is formed in an intermediate portion of the shaft cylinder, a protrusion sliding in the long groove is formed on the pressing member, and a side portion of the protrusion is used as a fulcrum, and a rear end of the protrusion is elastically deformed. Knock type writing instrument. 5. A rear-end knocking writing instrument in which a pressing member urged rearward is slidably disposed on an inner surface of a barrel, and a writing body in the barrel is protruded and retracted by forward and backward movement of the pressing member. ,
A long groove is formed in an intermediate portion of the barrel, and a projection that slides in the long groove is formed on the pressing member, and the projection is elastically deformable by forming at least two cuts in the pressing member. And a rear-end knock-type writing implement having different lengths of the at least two cuts.