KR880003396Y1 - Sharp pencil - Google Patents

Abstract

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Description

Shaaf Pencil

1 is a longitudinal cross-sectional view of an embodiment of the present pencil.

2 is an enlarged longitudinal sectional view of FIG.

3 is a cross-sectional view of the slider in the present disclosure.

Figure 4 is a partially enlarged cross-sectional view of another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: outer cylinder 1a: engaging hole

2: Tip cap 3: Lead saving pipe

4: lead chuck 6: eraser rubber

7: Chuck ring 8: Cushion sleeve

9: spring 11: slider

12: guiding pipe 13: cutout

14: the first sliding movement 15: the projection

17: the second sliding movement 19: heart

The present invention relates to a knock-type mechanical pencil, and more particularly to a pencil pencil is to be sent out from the lead guide pipe only if you press the lead on the writing paper without sending out the core by the knock operation.

When writing with a sharp pencil, the length of the lead that protrudes from the tip of the lead guide pipe is limited to a certain length due to the easy breaking of the lead, and when the lead length is worn out during writing, the protruding length is shortened. For example, it is necessary to knock out a button or the like installed at the rear end of the lead storage pipe so that the length of the lead is desired.

Therefore, a problem arises that the writing efficiency is inevitably caused to stop the writing operation in order to perform the penmanship operation.

Therefore, the present invention is designed to solve the above problems, and in addition to the conventional pen core delivery mechanism, the slider and the elastically supported cushion slid that are in contact with the core and the outer cylinder in contact with the pen core and the outer cylinder are worn out. When the front end of the lead is pressed against the writing paper etc., the slider is configured to protrude from the lead guide pipe by the amount of the retreat, so that the lead can be sent out by simply pressing the end of the lead on the paper without fixing the outer cylinder. The purpose is to provide a mechanical pencil.

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings as examples.

1 is an overall longitudinal sectional view of the first embodiment of the mechanical pencil, and FIG. 2 is a partially enlarged sectional view of the main part of FIG.

Reference numeral 1 denotes an outer cylinder, and the outer cap 1 is provided integrally with the tip cap 2, but the tip cap 2 may be separated from the outer cylinder 1.

In addition, in the outer cylinder 1, the lead storage pipe 3 is coaxially enclosed, and the lead chuck 4 is extended at the front end of the lead storage pipe 3.

And the rear end of the lead storage pipe (3) is fitted so that the eraser support member (5) into which the eraser rubber (6) is inserted.

In addition, the front end of the lead chuck (4) is to pass through the center of the chuck ring (7), the rear end of the chuck ring (7) is the front of the cushion sleeve (8) to move in the axial direction in the outer cylinder (1) It faces the flange part 8a. Here, the cushion sleeve 8 is an elastically deformable elastic member such as polyacetal, which is deformable, and is formed in its entirety in a cylindrical shape, and protrudes outwardly from the outer diameter of the body portion 8b at its rear end portion. The stopper 8c is formed, and the stopper 8c is radially cut out 8d in the trunk portion 8d so that the stopper 8c generates a moderately flexible resilience force against the trunk portion 8d. Long cutouts 8e are formed in the axial direction, respectively.

On the other hand, the shape of the stopper 8c is such that when the cushion sleeve 8 is assembled into the outer cylinder 1 together with the pen core feeder, the stopper 8c is opened with respect to the locking hole 1a drilled in the outer cylinder 1 by a one-touch push operation. It is shaped to be securely and smoothly engaged without shaking. Therefore, the trunk portion 8b elastically displaces the axial gap G of the radial cutout 8d to the limit with respect to the stopper 8c supported by the locking hole 1a, and the trunk portion normally (8b) is pushed forward.

A spring 9 for tightening the chuck is inserted between the front end of the lead storage pipe 3 and the flange portion 8a of the cushion sleeve 8 to the rear.

And the tip 켑 (2) has a front end portion is tapered in the shape of a cone, the front end portion is formed on the inner peripheral surface of the engaging surface 10 to form both inclined surface having a different inner diameter to form a stepped portion, this front end On the inner circumferential surface of the part, there is a slider 11 having a stopper surface 11a which is restricted in the forward direction by the locking surface 10, although sliding reciprocating movement in the axial direction is possible. (A) It is formed integrally with ABS resin or polyacetal, and the whole becomes the cylindrical shape which has the narrow diameter part 11b and the thick diameter part 11c.

At the front end of the center hole 11d of the slider 11, the lead guide pipe 12 is fitted by an interference fit method or the like. In addition, the slider 11 has a pair of shots by forming a cutout portion 13 in the outer cylindrical portion of which the right side, i.e., the thick diameter portion 11c, is formed in a double cylinder as shown in FIG. A first sliding piece 14 having a force is formed, but a protrusion 15 is integrally formed on a part of the outer circumference of the first sliding piece 14. On the other hand, because the notch 16 is also formed in the inner cylinder portion of the double cylinder, a second sliding piece 17 having a pair of weak elasticity is formed, and now a part of the inside of the two sliding pieces 17 is also protruded. 18 is integrally formed so that the projections 18 come into contact with the core 19 passing through the center hole 11d with a constant frictional force p2.

On the other hand, the protrusion 15 on the first sliding piece 14 is in contact with the inner peripheral wall of the tip cap 2 with a constant friction force (p1), the friction force (p1) is the second sliding piece ( It is set to be sufficiently larger than the frictional force p2 with the core by the projection 18 on the 17).

Next, the operation of the safety pencil will be described.

First, in the state in which no external force in the forward direction is applied to the rear portion of the core storage pipe 3, the lead chuck 4 is pushed in the retracting direction while maintaining the position in front of the movable area. ) Retreats with respect to the chuck 7, the lead chuck 4 is in a state of biting the core 19. In the state of FIG. 1, when the lead pipe (3) is knocked away from the eraser rubber (6), the lead chuck (4) is similarly moved forward with the chuck ring (7), and the chuck ring (7) tip cap ( When caught by the step 2a of 2), the chuck ring 7 is left, and only the lead chuck 4 moves forward to release the bite of the lead 19. When the knock operation is released, the lead storage pipe 3 retracts together with the lead chuck 4 so that the chuck ring 7 comes into contact with the flange portion 8a of the cushion sleeve 8. Tightening the front end of the chuck 4 to bite the lead 19, the retraction of the lead storage pipe 3 is stopped. By repeating this operation, the pen core 19 is sequentially sent out. The length of the pen core 19 which is sent out in one stroke operation is equal to the distance from the front end of the chuck ring 7 to the step portion 2a. Almost becomes the same.

In the process of advancing the pen core 19 by the pen core feeding operation, the friction force p2 of the pen core 19 and the protrusion 18 is less than the friction force p1 between the protrusion 15 and the inner circumferential wall of the tip cap 15. As a result, the lead 19 moves forward from the lead guide pipe 12 so that writing can be performed like a normal pencil.

On the other hand, if the front end of the pen core 19 is worn or broken during writing, pressing the remaining pen core 19 while holding the outer cylinder 1 on the writing surface, etc., leads holding the pen core 19. Forces in the retracting direction act on the chuck 4 and the core storage pipe 3 so that these members act together with the chuck ring 7 and the cushion sleeve 8 in response to bending force of the stopper 8c. Retreat against it. Here, the movement range in the retreat direction is set to about 0.5 to 1 mm, for example.

By the way, since the stopper 8c of the cushion sleeve 8 is supported by the latching hole 1a of the outer cylinder 1, the retraction area | region of these each member becomes the space | interval G at the maximum.

In addition, in the process of retracting the lead 19, after the lead 19 retreats to the front position of the lead guide pipe 12, pressure from the writing sheet is applied to the lead guide pipe 12. The lead guide pipe 12 also retracts with the slider 11. When the lead 19 moves to the end of the movement range, the positions of the lead 19 and the lead guide pipe 12 coincide.

Then, the pressure that pressed the outer cylinder 1 to the parcel paper surface is released, and the body portion 8b of the cushion sleeve 8 moves in front of the movable range according to the restoring resilience force caused by the bending of the bent stopper 8c. The chuck ring 7 is then advanced forward with the lead chuck 4 and the pen core 19 bite therein to be returned to its original position.

However, since the lead pipe 12 is not advanced due to the large frictional resistance between the protrusion 15 and the inner circumferential wall of the tip cap 2, the front end of the lead core 19 is the retraction amount of the lead guide pipe 12. It protrudes from the front end of the lead guide pipe 12 by a length corresponding to. This operation is similarly repeated until the lead guide pipe 12 reaches the rear end of the moving range.

On the other hand, when the lead guide pipe 12 reaches the end of the movement range and needs to protrude the lead 19 again, the lead storage pipe 3 is knocked to perform a normal lead delivery operation. According to the operation, the lead chuck 4 contacts the rear end of the slider 11 in the process of releasing the grip 19 and advancing again, thereby moving the slider to the front end of the moving range.

At this time, the lead core 19 is also advanced with the slider 11 by the same amount, so that the front end of the lead core 19 is maintained in a state coinciding with the front end of the lead guide pipe 12.

Subsequently, when the knock operation is released, the lead chuck 4 is left in its position and the lead guide pipe 12 is retracted to stop at the position engaged with the chuck ring 7. When the knock operation is performed again, it is possible to advance the lead 19 by a predetermined length according to the wire movement.

Figure 4 shows another egg tip structure of the tip cap (2) for receiving the slider 11, which is so that the front end of the slide (11) does not protrude out of the tip cap (2), Therefore, the support surface 2b which supports the front end of the slider 11 is formed in the inner surface of the tip cap 2. As shown in FIG.

Even in the tip cap 2 structure, the sliding movement of the slider 11 and the pen delivery operation according to the slider 11 are performed in the same manner as described above. In this case, the second sliding piece 17 may be a rubber ring.

As described above, the mechanical pencil of the present invention does not require knock operation while the lead guide pipe 12 is in a position where it can be retracted, but only by pressing the front end of the lead 19 onto a writing surface or the like (19). ) Can be protruded by a predetermined length, and it is easy to assemble and has a simple structure with a slider 11 which is integrally molded with a synthetic resin, etc. and a cushion sleeve 8 with a stopper 8c having a spring effect. It will be possible to make a sharpened pencil.

In addition, while the pen core 19 is consumed as much as the movable area of the pen lead guide pipe 12, it is not necessary to send the pen core by knock operation, so that writing can be continued without having to fix the outer cylinder. In addition, when excessive pressure acts on the pen core 19 during writing, the pen core 19 may be retracted elastically, thereby preventing the pen core 19 from being broken.

Claims (1)

Lead storage pipe (3) inserted to move in the axial direction in the outer cylinder (1), lead chuck (4) connected to the lead storage pipe (3), chuck ring for tightening the front end of the lead chuck (7) And a mechanical pencil provided with a spring (9) for chuck tightening elastically mounted between the chuck ring (7) and the core storage pipe (3), wherein the chuck ring (7) touches the chuck ring spring (9). A stopper 8c which is formed by a flange portion 8a and a back end portion 8d and a long cutout portion 8e at the back end thereof and is caught by the locking hole 1a formed in the outer cylinder 1 while having elasticity. The inner end of the cushion sleeve (8) having a) and the tip cap (2) consisting of a single body or a separate body of the outer cylinder (1) supports the core (19) with a predetermined friction force on the inner peripheral surface and the tip cap on the outer peripheral surface (2) A slice made to be in contact with the inner circumferential wall with a frictional force greater than the frictional force on the core in order to be able to slide The pencil pencil with the (11).