JPS6334947Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a slider operating device for a sharp pencil that can achieve centering by operating the index finger and prevent centering when carried.

In order to eliminate the trouble of changing the tool each time,
The structure of a sharp pencil that can be centered by notching the tip of the lead is described in Japanese Patent Application Laid-Open No. 53-145734.
It is stated in the No. However, the tip lock type sharp pencil has a slider with a core detent member provided at the tip of the barrel, and a chuck set that strongly resists the lead sliding back but easily allows the lead to be dragged out. This is because when the tip of the lead is pressed, both are moved back together using the lead as an intermediary, and when the pressure is released and each returns to the previous state, one of them has to be delayed and returned. However, its structure had the disadvantage of being quite complex. Furthermore, if the slider is repeatedly moved back and forth due to vibrations when carrying the device or contact with the fabric in the pocket where the slider is inserted, the centering may occur without realizing it, resulting in stains or core breakage. Furthermore, the thinner the core diameter became, the more careful we had to be to avoid breaking the tip when punching it.

The present inventor proposed that if the slider with the lead detent member could be operated back and forth directly with the index finger, the lead bited by the chuck set would remain in the same state.
Although the slider slides back at the lead gripping point of the lead detent member, the next time the slider returns, the lead can be pulled out of the chuck set by the lead gripping force of the detent member, and centering is possible. There is no need for simultaneous retraction of the slider and chuck set using the above-mentioned lead as an intermediary, and there is no need to delay either of them when returning, and furthermore, there is no need for operational errors that may cause breakage of the lead during centering. I realized that I didn't have to give it. However, there is still a potential for accidental centering when carrying.

The purpose of the present invention is therefore to provide a device that can perform centering operations with the index finger and at the same time prevent centering when carried. The explanation is as follows.

Reference numeral 1 denotes an operating member consisting of a mounting leg portion 2 and a fingertip operating portion 3, and the operating member 1 is integrally connected to a slider 4. There are two embodiments depending on where on the slider 4 the mounting leg portion 2 is fixed. The first case is when the slider core tube part 5 is stuck to the outside of the shaft tube 7, as shown in FIG. 1, and the second case is when it is hidden inside the shaft tube 7, as shown in FIG. This is a case where the slider is fixed to the rear cylinder portion 6. In the former case, by providing an appropriate distance between the operating member 1 and the barrel tip 7a, it is possible to directly move the slider 4 back and forth by fingertip operation. By forming a groove 9 along the longitudinal direction on one side and forming a protrusion 8 that fits into the groove 9 on the other side, it is possible to move back and forth in a constant longitudinal direction. In the latter case, the protrusion 8 is replaced by a mounting leg portion 2, and the groove 9 is replaced by a through hole 10 formed in the shaft tube 7 so that the mounting leg portion 2 can be inserted through the shaft tube 7. The core detent member 12 is installed inside the slider rear cylinder portion 6, and the slider spring 1
3 to always urge the slider 4 forward is the same as in the conventional example described above. Since the slider 4 is always urged forward and can be positioned at the front position, the normal position of the fingertip operation part 3 is also located at the front position corresponding to the starting end of the groove 9 or the through hole 10. .

By the way, in this invention, in order to prevent centering when carrying,
On the starting end side of the groove 9 or through hole 10 along the longitudinal direction, there is a groove 9a or through hole 1 along the circumferential direction.
0a continuously, and simply by holding the fingertip operating portion 3 with the fingertip and rotating it in the circumferential direction, the protrusion 8 or the mounting leg portion 2 can be inserted into the groove 9a or the through hole 10.
This allows it to be inserted into the inside of a (see Fig. 5).

The chuck set 14 includes a chuck actuating body 14a having an inclined surface exhibiting a wedge action, a trochanter 14b, a chuck body 14c forming a seat for the trochanter 14b,
An example of a ball chuck is shown which is made up of a chuck spring 14d stretched between the chuck actuating body 14a and the chuck body 14c, but this chuck spring 14d is sufficient to provide a clamping force to withstand the writing pressure applied to the lead. Moreover, even with the core holding force by the core detent member 12, when the core moves forward, it is made into a compressible weak spring force. The chuck set 14 urges the chuck actuating body 14a rearwardly by an internal spring 15 to assume a normal position. The figure also shows part of the mechanism for opening and closing the chuck using the rear end notch and side notch, but this point is not directly related to the gist of the present invention, so we will not discuss this point in detail. Omitted. However, depending on how the mechanism is configured, the internal spring 15 can be omitted.

As described above, the present invention includes a slider 4 with a core detent member 12 that is biased forward by a slider spring 13 in the shaft cylinder 7, and a core retaining force of the core detent member 12 when the member 12 moves forward. In a sharp pencil equipped with a chuck set 14 that can pull out the lead, the operating member 1 is set so that the fingertip operating member 3 of the operating member 1 is exposed outside the barrel 7.
The mounting leg part 2 is fixed to the slider 4, and the operating member 1 and the shaft tube 7 are connected in a connection relationship that allows the operation member 1 to be moved in the longitudinal direction and the circumferential direction of the shaft tube 7. , the user grips the barrel 7 with his/her index finger and pulls the fingertip operating member 3 of the operating member 1 toward you against the force of the slider spring 13 (see Fig. 2), then releases the fingertip ( By performing the operation shown in FIG. Slider 4 (see figure 4)
Since the slider 4 is locked so that it does not move back and forth, it is possible to completely eliminate the possibility of accidental centering caused by the movement of the slider 4 when carrying the slider.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Figs. 2 to 4 are half-cut sectional views showing the order of operation, and Fig. 5 is for explaining the movement of the slider in two directions. FIG. 6 is a sectional view showing a second embodiment of the present invention. 1... Operating member, 2... Mounting leg portion, 3... Fingertip operating member, 4... Slider, 7... Shaft cylinder, 1
2... core detent member, 13... spring for slider, 14... chuck set.

Claims (1)

[Scope of utility model registration request] A slider 4 with a core detent member 12 which is urged forward by a slider spring 13 and a core retaining force of the core detent member 12 are provided in the shaft cylinder 7.
Chuck set 1 that allows you to drag the core when moving forward.
4, the mounting leg portion 2 of the operating member 1 is attached to the slider 4 so that the fingertip operating portion 3 of the operating member 1 is exposed to the outside of the barrel 7.
The operating member 1 and the shaft cylinder 7 are fixed to the operating member 1.
This is a slider operating device for a sharp pencil, in which the shaft cylinder 7 is connected in a connection relationship between the longitudinal direction and the circumferential direction of the shaft tube 7 so as to be movable in shape.