JPS6313037Y2 - - Google Patents

Description

[Detailed description of the invention] The lead core is fed out by knocking the tip surface of the core tube at the tip of the slider that protrudes from the tip of the shaft cylinder, or the tip surface of the lead core that further protrudes from the core tube at the tip of the slider. For example, with a so-called snap-tipped mechanical pencil, you can insert it in your pocket and carry it around.
When the core tube at the tip of the slider hits or comes off the fabric in the pocket, the slider moves back and forth, and the lead core may protrude without you even realizing it, increasing the risk of lead breakage.

This invention was an attempt to eliminate the above-mentioned drawbacks by locking the slider so that it does not move when the device is not in use. The object of the present invention is to provide a structure that can be achieved without exposing special knobs or the like to the outside.

This invention will be explained below with reference to embodiments shown in the drawings.

The slider 3 loaded with the lead core entraining member 7 is the second
The second slider 8 is disposed inside the slider 8 so as to be movable back and forth. Set up Behind the slider 3 is a collar 6 that can collide with the second slider 8, and between the slider 3 and the second slider 8 is a resilient member 5 that pushes the slider 3 forward.
In addition, a locking member 4 is provided on the slider 3 so that the slider 3 can be stopped at the retracted position when the slider 3 is retracted against the elastic member 5. A locking groove 10 is provided in the slider 8 to constitute a locking portion A. The frictional resistance due to the frictional member 9 is made larger than the releasing force at the locking portion A.

The collector chuck device 11 has a trochanter 15 interposed between a chuck actuating tube 13 stretched by a resilient member 12 and a chuck body 14, and the chuck actuating tube 13 is always pushed forward by a resilient member 16. ing.

In the above configuration, the slider 3 can be locked in the following manner. That is, the front end of the chuck actuating tube 13 with the chuck opened by the rear end notch is brought into contact with the rear end of the slider 3, and then the slider 3, the lead core 17, and the slider 3 are pushed by the front end notch. The chuck actuating tube 13 is retracted to establish an engagement and locking relationship between the slider 3 and the second slider 8 as shown in FIG. The second one resists strong frictional resistance with the side.
The slider 8 is moved backward, and at the end of the backward movement, the friction member 9 of the second slider 8 is removed from the inner hole 2 (however, the frictional resistance force is applied to the elastic member 16 by the friction member 9), as shown in FIG. If the force is greater than the elastic force, the friction member 9 does not need to come out of the inner hole 2.) After pushing it in, the pressure on the paper surface etc. by the tip notch is eliminated.

In this case, the return force of the resilient member 16 acts on the chuck actuating tube 13 and the slider 3 that comes into contact with it, so that the lock at the locking portion A is released, and the slider 3 is released from the resilient member 5. The forward movement is stopped when the collar 6 collides with the rear end of the second slider 8. On the other hand, as for the second slider 8, its friction member 9 strongly resists and maintains the state shown in FIG. 4 as it is. Eventually, as shown in FIG. 5, the rear end of the collar 6 at the rear of the slider 3 comes into contact with the chuck operating tube 13, which has returned to its normal state due to the restoring force of the resilient member 16, and its front end contacts the chuck operating tube 13, which is in the retreated position. It is firmly accepted by the second slider 8, and is thus locked so that it does not move.

To release this lock, the state shown in FIG. 2 is returned to the state shown in FIG. 2 by moving the second slider 8 forward by overcoming the strong frictional resistance exerted by the friction member 9 due to the forward movement of the chuck operating tube 13 by the rear end notch. I can do it.

Centering can be achieved by knocking the tip in the state shown in Figure 2, as shown below.In this case, the frictional resistance of the second slider 8 against the shaft cylinder 1 side is compared to the force required to release the slider from the locking part A. Since the second slider 8 is large in size, the second slider 8 does not move during the centering operation using the tip notch and does not participate in the centering operation. That is, at the beginning slider 3
When the tip of the core tube or lead core 17 is pressed against a paper surface, etc., not only the slider 3 and the lead core 17 retreat, but also the entire collect chuck device 11 that bites the lead core 17 compresses the elastic member 16 and retreats. However, since the slider 3 is locked to the first locking part A while keeping the relative positional relationship between the slider 3 and the collect chuck device 11 constant, the subsequent pressing against the paper surface etc. described above is eliminated. Although the collection chuck device 11 and the lead core 17 held therein move forward due to the force of the compressed elastic member 16, the slider 3 remains locked at the locking portion A. The lead core 17 is made to protrude from the core tube at the tip of the slider by that much. Eventually, the locking at the locking portion A is released by the pressure of the collection chuck device 11, and the slider 3 returns to its initial state by the force of the elastic member 5, but as a result, the above-mentioned centering amount does not change. In this way, centering using the tip notch is possible.

As described above, this invention provides a second slider 8 in addition to the slider 3, and the friction resistance between the second slider 8 and the shaft cylinder 1 is
A relatively simple structure in which the release force of the slider 3 at the locking portion A formed on the inner surface of the slider 8 is made greater than that of the slider 3 is used to stop the slider 3 from moving, thereby preventing unexpected core deviation. Moreover, since the slider 3 is not subjected to the repulsive force of the repulsive member 16 when in the locked state, there is an advantage in that the risk of the lock being released by impact or the like is reduced. In addition, since it is only necessary to strongly knock the front end when in the rear end knocking state, it is not troublesome to use, and since the entire locking device is contained within the barrel 1 and nothing protrudes to the outside, it does not mar the appearance of the sharp pencil.

In the above embodiment, the method of locking the slider at the locking portion A may be to provide a locking member on the second slider, a locking groove on the slider, or a method other than the combination of a locking groove and a locking member. Also, although a friction member is provided on the second slider, a friction member may be provided in the inner hole of the tip member.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a tip-knob type mechanical pencil with a slider locking device of this invention, Fig. 2 is an enlarged view of its main parts, and Figs. 3 to 5 are sectional views showing the slider locking process. be. DESCRIPTION OF SYMBOLS 1... Shaft cylinder, 3... Slider, 8... Second slider, 11... Collection chuck device, 13
...Chuck operating tube, A...Locking part.

Claims (1)

[Scope of utility model registration request] A tip-knot type sharp pencil is provided with a locking part A that holds the slider 3 pushed into the barrel 1 at that position, and an elastic member 16 that presses the chuck operating tube 13 of the collection chuck device 11 forward. A second slider 8 is provided between the shaft cylinder 1 and the slider 3 so as to be movable back and forth, and the frictional resistance with the shaft cylinder 1 side is greater than the releasing force at the locking portion A, and the slider 3 and the second slider 8, and the slider 3 pushed into the shaft cylinder 1 with the rear end notch opening the chuck part 1 resists the force of the resilient member 16 and locks the chuck actuating pipe. 13 is pushed backward so that the second slider 8, which has locked the slider 3 to the locking part A, can occupy the retreated position, and is also pushed against the chuck actuating tube 13 by the return force of the resilient member 16. This makes it possible to release the lock at the locking portion A of the slider 3, and the locking portion is opened between the second slider 8 in the retreated position and the chuck operating tube 13 which has returned to its normal state due to the return force of the elastic member 16. A slider locking device for a tip-knob type sharp pencil capable of locking the collar 6 at the rear of the slider 3 which is released from the lock at A.