JPH0219800B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sharp pencil that feeds out the lead using a side slide method, and by retracting the operation knob after use, the lead can be pulled out from the lead detent member at the tip of the barrel and the chuck can be released. This allows the core to be returned to the core storage section by its own weight.

In a conventional sharp pencil having a lead detent member, after use, the lead is held by the lead detent member and then clamped by the chuck. Even when the chuck is set in the expanded state, it is firmly held by the core detent member. Therefore, it cannot be returned to the core storage section. However, if the lead can be returned to the lead storage part, the risk of lead breakage due to external impact can be greatly reduced, and it is also possible to develop new sharp pencils with a revolver-type lead storage structure. shall be.

In view of the above-mentioned circumstances, it is an object of the present invention to improve a sharpening pencil that feeds out the lead using a conventionally known side-slide method, so that the lead can be returned to the lead storage part with a simple operation after use. .

To achieve this objective, the structure of the present invention
In a sharp pencil in which the lead can be drawn out against the resistance of the lead detent member by forward operation of an operating knob that is exposed on the outside of the barrel housing the chuck set, the chuck body of the chuck set is attached to the lead detent member. It is possible to come into contact with the cylindrical partition member fixed inside the shaft cylinder at a position with a retracted length sufficient to pull it out from the shaft.
The fastener receiver of the chuck set can be retracted by a length sufficient to expand the head of the chuck body engaged with the cylindrical partition member, and the chuck body and the fastener receiver are retracted by the retraction of the operating knob. This is done manually.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, this sharpening pencil is no different from the known side-slide type sharpening pencil in the following respects. That is, the base 4 screwed onto the tip of the shaft tube 1 is provided with a core detent member 10 such as an O-ring and a core protection tube 11. By fixing the cylindrical partition member 6 to the inner wall surface approximately in the middle of the shaft tube 1, the front operating section 8 and the rear core storage section 9 are separated.
and both parts 8 and 9 communicate with each other,
The core storage portion 9 can be replenished with cores from a stopper 5 fitted into the rear end of the shaft tube 1. In order to feed out the core using the knob portion 2a of the operating knob 2 that is exposed outside the barrel 1, its handle 2b is inserted into a long and narrow hole 3 drilled in the barrel 1, and the annular portion 2c is A chuck body 22, which will be described later, can be pushed forward.

The operating portion 8 of the barrel 1 includes a fastener receiver 14 that is slidably inserted into the inner surface of the barrel 1 and has an elongated hole 18 into which the handle 2b of the operating knob 2 is inserted. An annular tightening ring 21 is slidably fitted between a protrusion 19 provided on the inner surface of the distal end portion and an inner protrusion 20 opposing the protrusion 19 . and behind it there is a stepped body 2.
3, and is configured to allow refills in the lead storage section 9 to be fed into the head one by one.
2, and a chuck spring 24 which is stretched between the rear end surface of the inward protrusion 20 of the fastener receiver 14 and the inward front end surface of the stepped body 23 and always urges the chuck body 22 backward. A known chuck set is installed. Such a chuck set can be achieved, for example, by bringing the front end surface 15 of the fastener receiver 14 into contact with a step 12 formed on the inner surface of the cap 4, or by bringing the step 16 formed on the outer surface of the fastener receiver 14 into contact with the rear end surface 13 of the cap 4. The two parts are brought into contact with each other to bring them to the normal position shown in FIG.

By engaging the annular portion 2c of the operating knob 2 with the stepped body 23 of the chuck body 22, when the operating knob 2 is pushed forward with a fingertip, the chuck body 22, the tightening ring 21, and the core are advanced together, and thus the core Centering of a certain length becomes possible by eliminating the resistance of the detent member 10. After the tightening ring 21 collides with the protrusion 19 of the tightener receiver 14, the chuck spring 24 is compressed and only the chuck body 22 moves forward, and the head of the chuck body 22 is expanded, that is, the core is opened. If you release your finger from the operating knob 2 at this stage, the chuck body 22 will open due to the return force of the chuck spring 24.
The goal is to return to the original steady position. In the process of returning, the tightening ring 21 is moved back to the point where it hits the inner protrusion 20, and the chuck body 2 is moved back to grip the core again.
2 is reduced in diameter. The above is no different from the lead feeding operation using the normal side slide method.

The present invention differs from the usual side-slide type sharp pencil structure in the following points. When the chuck body 22 occupies a normal position, the chuck body 22 is attached to the cylindrical end surface 7 of the cylindrical partition member 6.
The engagement stepped portion 25 is located at an opposing position corresponding to a length M that is sufficient to pull out the core from the core detent member 10.
is formed. The chuck body 22 is able to move backward until the engaging stepped portion 25 collides with the distal end surface 7 of the cylindrical portion, but once the chuck body 22 collides with it, it cannot retreat any further.

The annular portion 2c of the operating knob 2 is slidably fitted onto the outer circumferential surface of the stepped body 23 of the chuck body 22 so that it can slide rearward without any restriction. Even after the joining part 25 collides with the tip surface 7 of the cylindrical part, the fastener receiver 14 can be pushed rearward by the handle part 2b of the operation knob 2.

The distance between the rear end surface of the hole 3 drilled in the shaft tube 1 and the rear end surface of the handle 2b of the operating knob 2 inserted into the hole 3 is determined by the above-mentioned length M and the engagement with the cylindrical partition member 6. This is equal to the sum of the retracted length L of the fastener receiver 14 which is sufficient to expand the head of the chuck body 22, and in this way, by retracting the operation knob 2, the entire chuck set is retracted in length in the first stage. M is retracted, and in the second stage only the fastener receiver 14 is retracted further by a length L.

In the case of the present invention, which has a structure in which the chuck can be freely set and retracted, under normal writing pressure,
As a means 17 for preventing the vehicle from retreating easily, the first
In the illustrated example, the rear end surface of the fastener receiver 14 is resiliently repelled by a spring having a spring strength that does not easily bend under writing pressure. Moreover, it is expected that a fairly strong force will be required to move the operating knob 2 backward against this spring. If you dislike this point, you can replace the spring with a locking/disengaging mechanism as described below. In the example of Figure 4,
Two vertical cuts 2 from the rear edge of the fastener receiver 14
A hook portion 28 is formed on the tongue piece portion 27 which is made easier to bend in the radial direction by providing the hook portions 6 and 26.
is engaged with a locking hole 29 formed in the shaft tube 1 in the normal position. This can sufficiently withstand writing pressure in the locked state, and by releasing the locked state with a fingertip, the operation knob 2 can be easily retreated. It is also possible to perform the desired engagement and disengagement by expanding and contracting in the circumferential direction instead of flexing in the radial direction.
FIG. 5 shows an example of such a case. That is, the fastener receiver 14 is formed with two ladder-shaped protrusions 30, 30 whose diameter can be reduced in the circumferential direction, and these protrusions 3
0 and 30 engage and lock with a shoulder portion 31 of a groove having different widths formed in the barrel 1, so that writing pressure can be received. On the other hand, these protrusions 3
0 and 30, a groove formed in the handle 2b of the operation knob 2 engages with a ladder-shaped groove surface 32, and when pressed by the groove surface 32, it contracts in the circumferential direction and the engagement is released. It is becoming more and more common. In addition to these examples,
Needless to say, any appropriate engagement/disengagement mechanism may be employed.

The operation when configured as described above will be explained as follows. When the operating knob 2 in FIG. 1 is in its normal position, when the knob portion 2a is moved backward by fingertip operation, the chuck set and the clamped lead move back together, and after moving back by a length M, the As shown in FIG. 2, the core can be completely pulled out from the core detent member 10. On the other hand, the stepped portion 25 of the chuck body 22 corresponds to the tip surface 7 of the cylindrical portion of the cylindrical partition member 6.
corresponds to After that, when the operation knob 2 is moved back by the length L, only the fastener receiver 14 moves back as shown in FIG. It is possible to return it to 9.

As is clear from the above, the present invention has the following features:
The lead retracting function of the conventional side-slide sharp pencil can be used as a substitute and can be relatively easily improved to one with a lead return mechanism, allowing the user to press the operating knob with his or her index finger after writing. By pulling it toward you and pointing the tip upward, despite the presence of the core detent member,
This means that the core can be returned to the core storage section. In this way, the risk of core breakage due to external impact can be reduced.
Furthermore, it has great industrial value in that it has laid the foundation for the development of a new type of sharp pencil with a revolver-type lead storage structure.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views of the sharp pencil with a core resetting mechanism according to the present invention, and are shown in the order of operation, and Figures 4 and 5 are sectional views of the sharp pencil with a core resetting mechanism according to the present invention. Different embodiments of means for preventing backward movement are shown. DESCRIPTION OF SYMBOLS 1... Shaft tube, 2... Operation knob, 6... Cylindrical partition member, 10... Core detent member, 14... Fastener receiver, 22... Chuck body.

Claims (1)

[Claims] 1 The core detent member 10 is released by forward operation of the operating knob 2 that can be exposed outwardly from the shaft cylinder 1 in which the chuck set is installed.
In a side-slide type sharp pencil that allows the lead to be drawn out against the resistance of The annular portion 2c of the portion 2b is slidably fitted onto the outer circumferential surface of the stepped body 23 formed on the chuck body 22 of the chuck set so that it can slide rearward without any restriction, and the chuck body of the chuck set is 2
2 is capable of coming into contact with the cylindrical partition member 6 fixed in the shaft cylinder 1 at a position M with a retraction length sufficient to pull out the core from the core detent member 10, and the fastener receiver 14 of the chuck set has a retraction length M sufficient to pull out the core from the core detent member 10. The retraction length L is sufficient to not only allow M to be retracted but also to expand the head of the chuck body 22 engaged with the cylindrical partition member 6.
A side-slide type sharp pencil with a core return mechanism, characterized in that the chuck body 22 and the fastener receiver 14 are moved back by moving the operating knob 2 backward.