JPS6023186Y2 - Knotsuku style pencil - Google Patents

Description

[Detailed description of the invention] This invention relates to a knock-type mechanical pencil in which a mechanism unit that can gradually draw out the lead by itself, that is, a knock-type mechanical pencil body, can be easily attached to the inside of the shaft and prevents the cap from loosening.

Conventional knock-type mechanical pencils consist of a chuck with a fastener fitted loosely into the nipple, and a chuck spring between the chuck and the connected lead tank that acts as a wedge to firmly hold the lead. It had been.

Then, insert such a mechanism into the inside of the shaft while aligning it with the hexagonal part for preventing rotation, lock the nipple with the locking stage of the shaft, and attach the cap to the threaded part of the nipple that protrudes from the shaft. The screw part was tightened.

Therefore, the mechanism part is tightened by the cap via the locking stage of the shaft, and the assembly is completed.

Furthermore, in assembling such a configuration, it is difficult to align the hexagonal parts, which poses 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 the user.

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. Put it away.

Therefore, the object of this invention is to provide a knock-type mechanical pencil that solves the above two problems by compressing an elastic body between the flange of the nipple and the inner thigh of the sheath.

The configuration of this invention will be explained in detail based on the drawings.

FIG. 1 shows a knock-type mechanical pencil body in which a base 2 with a lead holder 1 fixed therein 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 between it and the locking step 2A of the mouthpiece 2 by a distance corresponding to the amount by which the core is fed out.

On the other hand, the rear end of the chuck 5 with the fastener 4 fitted thereon is fixed to a core tank 6, and a chuck spring 7 is stretched between the front end 6A of the core tank 6 and the inner thigh 3A of the nipple 3.

Further, a collar portion 3B is provided at the rear of the nipple 3, and an elastic body 8 is fitted into a cylindrical portion 3C extending further rearward than the collar portion 3B, thereby forming a knock-type mechanical pencil body. .

The elastic body 8 used here includes, for example, a rubber spring, but rubber is particularly preferred.

When the knock-type mechanical pencil body configured in this way is attached to the shaft 9 as shown in FIG. By screwing the sheath 10, the inner thigh 1 of the sheath 10
0A is the elastic body 8 fitted to the collar 3B of the nipple 3
Since the spring is compressed, the front inner stage 9A of the shaft 9 and the front stage 2B of the cap 2 are compressed by the elastic force, and there is no loosening of the cap due to rattling or rotation.

Note that the base of the knock-type mechanical pencil body and the nipple may be attached by screwing in the same way as before, but since the elastic body always applies pressure in the axial direction, even if they are fitted and attached with a slight fitting force, It can be constructed without rattling or rotating.

Furthermore, in the case of screwing, 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 installing the pre-assembled knock-type mechanical pencil body inside the shaft, when fixing the knock-type mechanical pencil body with the sheath, there is a gap between the flange of the nipple and the inner thigh of the sheath. It is extremely easy to assemble by tightening with an elastic body interposed, and at the same time, the deformation of the elastic body can absorb variations in the axial direction of each member, greatly improving manufacturing efficiency and 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 sectional view showing a knock-type mechanical pencil body constructed according to this invention. FIG. 2 is a longitudinal sectional view showing the knock-type mechanical pencil of this invention. 1... Core holder - 2... Base, 2A.
...Locking stage of cap 2, 2B...Front stage of cap 2, 3...Nipple, 3A...Inner thigh of nipple 3, 3B... ... collar of nipple 3, 3
C... Cylindrical part of nipple 3, 4... Fastener, 5... Chuck, 6... Core tank, 6A... Core Front end of tank 6, 7...
Chuck spring, 8...Elastic body, 9...
...Shaft, 9A...Front inner stage of shaft 9, 10...
... Saya, IOA ... Saya 10's inner thigh.

Claims (1)

[Claims for Utility Model Registration] 1. Attach the cap 2 containing the core holder 1 to the nipple 3, and loosely fit the fastener 4 between the locking step 2A of the cap 2 and the tip of the nipple 3. The chuck 5 with the fastener 4 externally fitted is fixed to the front part of the core tank 6, the chuck spring 7 is stretched between the inner leg 3A of the nipple 3 and the core tank 6, and the front inner stage 9A of the shaft 9 is fixed to the front part of the core tank 6. The inner thigh 10A of the sheath 10 and the nipple 3 are brought into contact with the front stage 2B of the sheath 10 and screwed onto the shaft 9.
A knock-type mechanical pencil characterized in that an elastic body 8 is compressed with a collar part 3B. 2. The knock-type mechanical pencil according to claim 1, wherein the elastic body 8 compressed by the flange 3B of the nipple 3 and the inner thigh 10A of the sheath 10 is made of rubber. 3. The knock-type mechanical pencil according to claim 1, wherein the elastic body 8 compressed by the flange 3B of the nipple 3 and the inner thigh 10A of the sheath 10 is composed of a spring.