JPH018394Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanism part that can gradually draw out the lead by itself, that is, a notch-type sharp pencil whose body can be easily attached to the inside of the shaft and which prevents the mouthpiece from loosening.

In the conventional knock-type sharp pencil, the chuck with the fastener fitted loosely into the nipple, and the chuck spring between the chuck and the connected lead tank acts as a wedge to firmly hold the lead. It was configured as follows. Then, insert this mechanism into the shaft while aligning it with the hexagonal part for preventing rotation, lock the nipple in the locking stage of the shaft, and insert the cap into the threaded part of the nipple that protrudes from the shaft. It was used to tighten the threaded part. Therefore, the mechanism part is tightened by the cap via the locking stage of the shaft, and the assembly is completed. When assembling such a structure, it is difficult to align the hexagonal parts, which has been a problem in automating the assembly. An even bigger problem is that the cap is tightened through the shaft, so if the shaft is made of resin, this problem may be slightly less, but if the shaft is made of metal, the cap that was supposed to be tightened may be used while carrying or writing. The cap loosens due to the vibration inside, and the user has to retighten the cap each time, but it is not possible to obtain a strong tightening force just by tightening by hand, and the cap loosens again and the core breaks. Or they may get lost, causing great inconvenience to users.
On the other hand, if the manufacturer tightly tightens the cap mechanically to prevent it from loosening, there is a problem that the folded core may get stuck inside the cap and the cap cannot be removed when the cap is removed to clean the inside. It ends up.

Therefore, the purpose of this invention is to provide a knock-type sharp pencil that solves the above two problems by compressing an elastic body between the front inner stage of the shaft and the front stage of the base. .

The configuration of this invention will be explained in detail based on the drawings. FIG. 1 shows a knock-type sharp pencil body in which a base 2 with a lead holder 1 fixed inside is attached to a nipple 3. A fastener 4 is loosely fitted to the tip of the nipple 3, and the fastener 4 is configured to be slidable by a distance corresponding to the lead feed amount L between the locking step 2A of the cap 2. On the other hand, the rear part of the chuck 5 with the fastener 4 fitted thereon is fixed to the core tank 6, and a chuck spring 7 is attached between the front end 6A of the core tank 6 and the inner stage 3A of the nipple 3 to form a lock type sharp. It is composed of pencil type. Referring to FIG. 2, the knot-type mechanical pencil in which the knot-type sharpening pencil body constructed in this way is mounted inside the shaft 8 and the sheath 9 will be explained based on FIG. 2.
is constructed between the front inner stage 8A of the shaft 8 and the front stage 2B of the cap 2, and a sheath 9 is constructed at the rear end 3B of the nip 3.
Screw the shaft 8 and sheath 9 together with the inner stage 9A of the
It is constructed by compressing an elastic body 10 between the front inner stage 8A of the shaft 8 and the front stage 2B of the cap 2, and the cap 2 is pressed against the elastic body 10 by the elastic force, causing the cap to wobble or rotate. 2 is constructed without any looseness.
The elastic body 10 used here may be, for example, a rubber spring, but rubber is particularly preferred. Note that the cap and nipple of the knock-type sharp pencil body may be attached by screwing together as in the past, but since the elastic body always applies pressure in the axial direction, even if they are fitted and attached with a slight fitting force,
Can be configured without wobbling or rotating. In addition, when screwed together, the centering length can be arbitrarily adjusted by loosening or tightening the screw of the cap. Even in that case, the cap will not loosen.

As explained above, after the pre-assembled lock-type mechanical pencil body is installed inside the shaft, when the lock-type mechanical pencil body is fixed with the sheath, the front inner stage of the shaft and the base are locked. By interposing an elastic body between the steps and tightening them, it is extremely easy to assemble, and at the same time,
By deforming the elastic body, it is possible to absorb variations in the axial direction of each member, thereby greatly improving manufacturing efficiency and at the same time stabilizing quality. Furthermore, the most significant effect is that loosening of the cap can be completely prevented, which is extremely effective in practical terms.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a click-type mechanical pencil body constructed according to this invention, and FIG. 2 is a longitudinal cross-sectional view showing a lock-type mechanical pencil body according to this invention. 1... Lead holder, 2... Cap, 2A... Locking stage of cap 2, 2B... Front stage of cap 2, 3... Nipple, 3A... Inner stage of nipple 3, 3B... Back of nipple 3 End, 4... Fastener, 5... Chuck, 6
... Core tank, 6A... Front end of the core tank, 7...
Chuck spring, 8...shaft, 8A...front inner stage of shaft 8, 9...sheath, 9A...inner stage of sheath 9, 10
...Elastic body.

Claims (1)

[Scope of claim for utility model registration] 1. A cap 2 with a built-in lead holder 1 is attached to a nipple 3.
Attach it to the locking step 2A of the cap 2 and the nipple 3.
A fastener 4 is loosely fitted between the tip of the nipple 3 and the chuck 5 with the fastener 4 fitted on the outside is fixed to the front part of the core tank 6. The lock spring 7 is stretched to constitute a lock type sharp pencil body, and the front inner stage 8 of the shaft 8 is
A and the front stage 2B of the cap 2 compress the elastic body 10, and the rear end 3B of the nipple 3 is in contact with the inner stage 9A of the sheath 9 screwed onto the shaft 8. Sharpening pencil. 2. The knot-type mechanical pencil according to claim 1, wherein the elastic body 10 compressed by the front inner stage 8A of the shaft 8 and the front stage 2B of the base 2 is made of rubber. 3. Utility model registration claim 1 characterized in that the elastic body 10 compressed by the front inner stage 8A of the shaft 8 and the front stage 2B of the base 2 is composed of a spring.
Notsuku type mechanical pencil as described in the section.