KR950010432Y1 - Sharp pencil - Google Patents

Abstract

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Description

Mechanical pencil

1 is a longitudinal cross-sectional view showing the configuration of the first embodiment of the mechanical pencil of the present invention.

Figure 2 is a longitudinal cross-sectional view showing the configuration of a second embodiment of the mechanical pencil of the present invention.

FIG. 3 is a partially developed view of an anterior inner cylinder in which a relationship between a ramp and a protrusion is shown in the first embodiment shown in FIG.

4A, 4B, and 4C are explanatory diagrams showing the configuration of each other embodiment of the main component structure in the first embodiment shown in FIG.

5A and 5B are partially developed views of an anterior inner cylinder showing slopes and protrusions, respectively.

* Explanation of symbols for main parts of the drawings

1: front outer cylinder 2: front inner cylinder

2a: annular catching portion 2B: closed slit

2C: open slit 3: lead delivery mechanism

3g: Fill tank 3h: Joint

4: back inner cylinder 5: back outer cylinder

7: ramp 7 ₁ , 7 ₃ : first ramp

7 ₂ , 7 ₄ : 2nd inclined path 7A (7 ₁ A, 7 ₂ A, 7 ₃ A, 7 ₄ A): Start end

7B (7 ₁ B, 7 ₂ B, 7 ₃ B, 7 ₄ B): Terminal 8: Projection

9: eraser rubber 10: driving member

10a: projection 11: axial groove

12: stone 17: fitting pen

18: opening

The present invention relates to a mechanical pencil with a mechanism for converting the rotation of the rear cylinder to the axial movement.

Conventionally, a ball-point pen having a rotation-axial movement converter mechanism may be configured such that when the rear outer cylinder is rotated, the writing unit may appear in response to the rotational direction. Also, the conventional pencil is protruded by rotating the rear outer cylinder of the writing unit. When the pen delivery device was operated by knock operation, the pen lead was drawn out from the writing unit so that writing was possible.

However, the mechanical pencils, which are ideal and thin, require not only the rotation-axial movement converter mechanism but also the lead-feeding mechanism which operates by knock operation, which is complicated in structure and thus needs to be rotated and then changed to knock operation. Has the drawback that the manufacturing cost becomes expensive because of the complexity.

The present invention has been made in view of the above circumstances, and its object is to provide a mechanical pencil that is simple in structure and excellent in simplicity and can be carried out at a low price.

The present invention for achieving the above object is the front outer cylinder (1), the front inner cylinder (2) installed in the front outer cylinder (1), the pen core delivery mechanism (3) fitted in the front inner cylinder (2), the front A drive member 10 which can rotate about the outer cylinder 1 and the front inner cylinder 2, but cannot move in the axial direction, and is attached to be detachable without being able to rotate about the drive member 10. Rear inner cylinder (5), the rear inner cylinder (4), the front inner cylinder (2) and the rear inner cylinder inserted into the driving member 10 so as not to be able to rotate or axially move with respect to the driving member (10). One of (4) is provided with a ramp 7 formed in an inclined direction with respect to the axis across the start end 7A and the end 7B, while the other is slipped on the ramp 7. Protruding portion 8 is formed so as to be movable, the rear inner cylinder 5 is rotated so that the rear inner cylinder 4 is the front outer cylinder 1 and the front. When the axial direction to advance toward the inner tube (2), the lead feeding mechanism (3) is also to move in the axial direction.

Therefore, when the rear outer cylinder 5 is rotated, the rear inner cylinder 4 is rotated through the driving member 10, and the protrusion 8 formed on either of the rear inner cylinder 4 or the front inner cylinder 2 is By advancing along the ramp 7 from the start end 7A of the ramp 7 formed on the other side, the rear inner cylinder 4 moves forward toward the front outer cylinder 1 and the front inner cylinder 2, As the rear inner cylinder 4 moves forward, the pen core transmitting mechanism 3 moves forward again to push the writing unit (slider and guiding pipe or tip end portion 3a) from the front end of the front outer cylinder 1.

Hereinafter, an embodiment of the present invention will be described.

1 is a longitudinal cross-sectional view of the first embodiment of the mechanical pencil of the present invention. In the drawing, reference numeral 1 is a front outer cylinder, and 2 is a front inner cylinder installed in the front outer cylinder 1, which is an inner inner cylinder (2). The annular groove 2a is formed in the outer circumference of the circumference, and the annular locking member 14 is rotatable with respect to the front inner cylinder 2 in the annular groove 2a.

An annular groove 14a is formed again on the outer circumference of the annular locking member 14, and the projection 10a formed near the front end of the driving member 10 is fitted to the annular groove 14a, thereby driving. The member 10 is attached so as to rotate about the front inner cylinder 2 but not to move in the axial direction while operating integrally with the annular locking member 14.

The pen core feeding mechanism 3 is inserted into the front inner cylinder 2, which has a writing implement 3a, a slider 3b, a chuck 3c, a chuck ring 3d, and a chuck ring spring ( 3e), the cushion spring 3f, the fill tank 3g, and the joint part 3h are comprised, and the well-known pen delivery mechanism is formed.

In addition, the rear member (5) is connected to the drive member 10 so that it can not be rotated with respect to the drive member 10 can be detached, when replenishing the core lead to extract the rear outer cylinder (5) It is possible to insert the lead from the back of (3g).

In the drive member 10, the rear inner cylinder 4 is inserted so as not to rotate about the driving member 10 but to move in the axial direction, that is, the outer circumference of the rear inner cylinder 4 Is formed in the axial groove 11, the inner periphery of the drive member 10 has a structure in which a plurality of protrusions 12 to be fitted to the axial groove 11 is formed. Here, if the number of the axial grooves 11 is slightly larger than the number of the protrusions 12, both may be more easily fitted.

Meanwhile, the axial grooves 11 and the projections 12 may be formed in the driving member 10 and the rear inner cylinder 4 on the contrary, respectively. In this case, the axial grooves 11 and the projections 12 may be formed. If you set the number of to one side and the other side to be less easily fit.

Moreover, the return spring 15 is arrange | positioned from the rear side of the said front inner cylinder 2 to the rear inner cylinder 4, and the back inner cylinder 4 is pushed back toward the axial direction with respect to the front inner cylinder 2, and is attached.

In addition, the eraser rubber support 4A is screwed to the rear end of the rear inner cylinder 4. Here, reference numeral 9 denotes an eraser rubber inserted into the eraser rubber support 4A.

On the other hand, the pen core tank 3g of the pen core sending mechanism 3 extends the inside of the hollow portion of the rear inner cylinder 4 so that its end has a predetermined gap d in the axial direction in the eraser rubber support 4A. Since the gap d has the chuck 3c half open when the pen core feeding mechanism 3 overpowers the rear side, the pen core slides, and thus the pen core tank is prevented from slipping. It is a free space provided between the distal end of 3g and the eraser rubber 4A.

The front inner cylinder 2 is formed with an inclined hole 7 which is formed in the circumferential direction and has both end portions 7A and a terminal portion 7B, while the rear inner cylinder 4 is inclined. Protruding portions 8 which are in sliding contact with the holes 7 are formed, where the inclined holes 7 and the protruding portions 8 are formed in the rear inner cylinder 4 and the front inner cylinder 2, respectively, as opposed to the above. good.

FIG. 3 shows a part of the front inner cylinder 2 in a developed view to show the relationship between the ramp 7 and the protrusion 8 in the case of the first embodiment mechanical pencil shown in FIG. 7) the leading-end part (7 of the first ramp ₍₇₁₎ and the second ramp (second ramp ₍₇₂₎ leading-end portion ₍₇₁ a) in place as a first ramp ₍₇₁₎ to _{72) 2} a) is on the opposite side of the first ramp ₍₇₁₎ such that the second ramp ₍₇₂₎ has been formed to communicate with each other. And the second ramp ₍₇₂₎ terminating portion ₍₇₂ B) of the, with a projection (8) end, because put to narrow the diameter of the hole in which the passage to increase the feeling of when the protrusion (8) go into or out of it is possible not become jammed inside the unit (7 ₂ B).

On the other hand, it is preferable that the end portion 7 ₁ B of the first inclined passage 7 ₁ does not change the hole diameter so that the projection 8 is easily returned to the start portion 7 ₁ A.

In addition, the start end portions 7 ₁ A and 7 ₂ A of the inclined hole 7 are opened to the rear through the closing slit 2B as shown in FIG. 4A, so that the closing slit 2B is opened from the open end when assembling. The protrusions 8 are pushed through the _first ends 7 ₁ A and 7 ₂ A, in which case the protrusions 8 are easily coupled to the _first ends 7 ₁ A and 7 ₂ A. Rather, they will not join and then escape backwards.

And as shown in FIG. 4B, even if the start ends 7 ₁ A, 7 ₂ B of the inclined hole 7 are opened backward by the open slit 2C and the closed slit 2B, the same effect can be obtained. Will be.

4C is an example in which the fitting piece 17 through which the ramp 7 is drilled is constituted by a separate member from the front inner cylinder 2, which is almost the same as the fitting piece 17 in the portion corresponding to the front inner cylinder 2; An opening 18 of size is connected to the closing slit 2B. Therefore, when assembling the front inner cylinder 2, the opening 18 is fitted to the fitting pen 17 to be inserted into the front outer cylinder 1, in which case the outer side is surrounded by the front outer cylinder 1 driving member 10. As a result, the fitting piece 17 once inserted does not come out during the operation.

Therefore, if it is comprised in this way, since it does not need to perforate directly in the front inner cylinder 2 by the inclination path 7, it becomes easy to manufacture.

Next, the operation of the first embodiment configured as described above will be described.

Projection 8 is the leading-end sphere ₍₇₁ A) of the first ramp ₍₇₁₎ for rotating the rear of the outer cylinder 5, the driving member 10 and the back of the inner tube is to (4) rotates the rear of the inner tube (4) The first inclined passage (7 ₁ ) is discharged from the battery, and when the advancement of the rear inner cylinder (4) exceeds the gap (d), the front of the eraser rubber (9) that moves forward integrally with the rear inner cylinder (4) The fill tank (3g) of the delivery mechanism (3) touches and advances the fill tank (3g) together. Subsequently, when the protrusion 8 moves to the middle portion 7 ₁ C, the chuck 3c of the pen core feeding mechanism 3 moves forward to deliver the pen core.

Then, when the rear outer cylinder 5 is rotated against the spring force of the spring to move the projection 8 until it reaches the terminal portion 7 ₁ B of the first inclined hole 7 ₁ , the chuck 3c By pushing the slider 3d forward, the writing portion (slider guide pipe; 3a of the slider) is pushed out from the front end of the front outer cylinder 1.

On the other hand, when the hand is released from the rear outer cylinder 5, the chuck tightening spring 3e and the return spring 15 return to the chuck 3c, the fill tank 3g, and the rear inner cylinder 4 in the axial direction. In the state where the guide pipe is pushed out, the projection 8 is returned to the start end portions 7 ₁ A and 7 ₂ A, whereby writing can be performed in this state. On the other hand, in order to draw the lead, when the rear outer cylinder 5 is reciprocated to move the lead in the lead guide pipe (3a) to a predetermined length.

The range of A shown in FIG. 3 is a range in which the lead is sent out from the lead guide pipe 3a by a predetermined quality, and the range of B shown in FIG. 3 is a range in which the lead guide pipe 3a moves in and out. to be.

Then, in order to draw the lead guide pipe 3a into the front outer cylinder 1, the rear outer cylinder 5 is reversely rotated so that the protrusion 8 is inserted into the end portion 7 ₂ B of the second inclined path 7 ₂ . When the lead guide pipe 3a is pushed toward the front outer cylinder 1 in one state, the lead guide pipe 3a can move in the axial direction because the chuck 3c keeps the state where the lead grip is held. To be stored in the front outer cylinder (1).

FIG. 2 is a longitudinal sectional view showing the configuration of the second embodiment of the present invention. Here, the same members as in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

The lead delivery mechanism 3 according to the second embodiment includes a writing unit (a lead guide pipe; 3a), a slider 3b, a chuck 3c, a chuck ring 3d, a chuck tightening spring 3e, and a cushion spring 3f. ) And the joint member 3h ', the inner diameter of the rear inner cylinder 4 extends backward in the hollow portion of the rear inner cylinder 4 so that the rear wall of the rear member of the joint member 3h' can accommodate the pen core. The end space 4b of the reduction portion 4a is ended with a predetermined gap d in the axial direction. As shown in the first embodiment, a clearance for preventing slippage is provided. do.

The inner diameter reducing portion 4a of the rear inner cylinder 4 is formed on the rear portion of the rear inner cylinder 4, and its circumferential wall is continuous with the rear peripheral wall of the joint member 3h 'to form a part of the core compartment. .

In addition, although the eraser rubber 9 is directly inserted into the rear end of the rear inner cylinder 4, the eraser rubber support 4A may be provided as in the first embodiment.

Therefore, in the second embodiment, when the rear outer cylinder 5 is rotated, the driving member 10 and the rear inner cylinder 4 rotate, and the protrusion 8 of the rear inner cylinder 4 is along the inclined hole 7. When the advancing of the rear inner cylinder 4 is advanced beyond the gap distance d, the end face 4b of the inner diameter reducing portion 4a touches the rear end of the joint member 3h ', thereby connecting the joint member 3h. ') Is advanced together, so that the lead is sent out as in the first embodiment, and the writing unit (the lead guide pipe; 3a) is pushed out. When the hand is released from the rear outer cylinder 5, the chuck 3c, the coupling member 3h 'and the rear inner cylinder 4 are pushed back in the axial direction by the restoring force of the chuck tightening spring 3e and the return spring 15. You lose.

On the other hand, when housing the lead guide pipe 3a, the rear outer cylinder 5 may be reversely rotated as in the first embodiment.

In the second embodiment, since the inner surface of the joint member 3h 'and the rear inner cylinder 4 can be used as a space for the fill core tank instead of the fill core tank, the fill tank portion can be omitted.

And the rear inner cylinder 4 and the joint member (3h ') as shown, the rear end of the joint member (3h') and the rear inner cylinder (4), in addition to the configuration to contact the front portion of the joint member (3h ') It is also possible to form a step projecting outward so that this step reaches the front end of the rear inner cylinder 4.

On the other hand, in each of the above embodiments, the writing section 3a has been described as being a lead guide pipe of the slider, but in the case of a fixed pencil pencil in which the lead guide pipe does not stand, In this case, as shown in FIG. 5A, the ramp 7 is formed from the start end 7 ₃ A to the end 7 ₃ B so that the protrusion 8 reciprocates therebetween. The tip of the nib (3a) is sent out by the predetermined length. Further, as shown in FIG. 5B, when the ramp 7 ₄ having the start end 7 ₄ A and the end 7 ₄ B is provided again, the protrusion 8 is connected to the end 7 ₄ B. FIG. Since the chuck can be held so as to be kept open, the writing unit 3a can be pushed into the front outer cylinder 1, so that the operation for accommodating the lead is convenient.

In addition, in the present invention, the inclined path 7 may be an inclined hole as shown, but may be an inclined groove.

As described above, according to the present invention, by rotating the rear outer cylinder 5, the rear inner cylinder 4 is advanced in the axial direction toward the front outer cylinder 1 and the front inner cylinder 2, and the pen core feeding mechanism 3 is also operated. It is configured to move forward in the axial direction, and in particular, it adopts a simple rotational-axial movement converter mechanism composed of a ramp which both ends are used as starting and end portions, and a protrusion which is fitted into the ramp and slides. In addition, the penetrating operation of the writing unit and the pen core sending operation from the writing unit can be performed only by the rotation operation, so that the pencil can be easily operated at low cost.

Claims (9)

Front outer cylinder (1), the front inner cylinder (2) installed in the front outer cylinder (1), the known pen core delivery mechanism (3) fitted in the front inner cylinder (2), the front outer cylinder (1) and the front inner cylinder (2) A driving member 10 which rotates with respect to the driving member 10, but which cannot be axially moved, a rear outer cylinder 5 which is not rotatable with respect to the driving member 10 and detachably attached thereto, and the driving member 10 The rear inner cylinder 4, which is not rotatable with respect to the drive member 10 and cannot be moved in the axial direction, and the rear spring 4 installed to push the rear inner cylinder 4 backward with respect to the front inner cylinder 2 (15), wherein either one of the front inner cylinder (2) and the rear inner cylinder (4) is formed with an inclined path (7) which forms an inclined direction with respect to the axis from the start end portion (7A) to the end portion (7B). On the other hand, the other side is formed with a projection 8 which is fitted to slide on the ramp 7, the outside of the back The cylinder 5 is rotated in one direction with respect to the front outer cylinder 1 so that the rear inner cylinder 4 is advanced in the axial direction toward the front outer cylinder 1 and the front inner cylinder 2, and thus the pen core delivery mechanism 3 ) Also the mechanical pencil, characterized in that to be advanced in the axial direction. 2. The pencil pencil according to claim 1, wherein the fill tank (3g) is formed on the rear portion of the fill delivery mechanism (3). The rear peripheral wall of the joint member (3h ') of the lead delivery mechanism (3) extends backward to accommodate the lead, and constitutes the lead storage unit together with the hollow portion of the rear inner cylinder (4). The mechanical pencil characterized in that it was supposed to be. 2. The shading according to claim 1, characterized in that the passage width is reduced to increase the sensation when the protruding portion 8 is fitted or escapes from the starting end portion 7A and the end portion 7B of the ramp 7. A pencil. The method of claim 1, wherein the leading end portion of the ramp (7) of the first ramp _{(71, 73)} and the second ramp As done in _{(72, 74),} first ramps _{(71, 73)} The second inclined path on the opposite side of the first inclined path (7 ₁ , 7 ₃ ) such that (7 ₁ A, 7 ₃ A) becomes the start end (7 ₂ A, 7 ₄ A) of the second inclined path (7 ₂ , 7 ₄ ). Pencil pencil (72,74) characterized in that the communication. 2. The mechanical pencil according to claim 1, wherein the start end portion (7A) of the ramp (7) is opened to the rear. 7. The mechanical pencil according to claim 6, wherein the start end portion (7A) of the ramp (7) is opened rearward via the closing slit (2B). 2. The mechanical pencil according to claim 1, wherein the end portion (7B) of the ramp (7) is opened rearward via the closed slit (2B) and the open slit (2C). The shaping device according to claim 1, characterized in that an inclined piece (7) is formed in which the inclined path (7) is fitted into an opening (18) formed in any one of the front inner cylinder (2) or the rear inner cylinder (4). Pencil.