JPS5912231Y2 - Knotsuku style pencil - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knock-type mechanical pencil in which a mechanism body consisting of a cap, a connector, a chuck, a tightening ring, a chuck spring, and a lead tank is housed inside the exterior.

If you are faced with design limitations because a conventional knock-type mechanical pencil has a cap or tip on the front part of the front shaft, or if you want to use a knock-type mechanical pencil with a different core diameter, etc. The mechanism consisting of the cap, chuck, lead tank, tightening ring, and spring must be replaced separately, and the knock of this type allows the core diameter to be changed simply by replacing the mechanism. It could not be a formula mechanical pencil.

This invention improves the above-mentioned conventional drawbacks, and the mechanism body is pressed against the rear shaft by an elastic body provided between the front shaft and the mechanism body, which eliminates the problem of dimensional variations during installation. There is no rattling in the mechanical parts, and the mechanical parts are housed inside the front and rear axles, that is, the exterior, and by simply replacing the mechanical parts, you can not only create a knock-type mechanical pencil with a different lead diameter, but also the front shaft. By making the length approximately equal to or longer than the length of the rear shaft, a knock-type mechanical pencil with an innovative design can be obtained.

The structure of this invention will be explained based on the drawings. As shown in FIG. 1, a base 3 having a built-in lead holder 2 for lightly holding a lead 1 is screwed into a connector 4.

A tightening ring 5 is loosely fitted inside the mouthpiece 3, and normally the tapered surface 7A of the chuck 7 is pressed against the tightening ring 6 by the elastic force of the chuck spring 6, and the core tank 8 is fixed to the chuck 7. has been done.

A knob 9 is fitted on the rear outer surface 8A of the lead tank 8, and an eraser 11 covered with an eraser case 10 is fitted on the rear inner surface 8B of the lead tank 8.

The mechanism body configured in this way is connected to the connector 4 and the front shaft 12.
An outer spring 13 is provided between the front shaft 12 and the rear shaft 14, and the front shaft 12 and the rear shaft 14 are inserted into the front shaft 12 with the rear end surface 4A of the front shaft 12 and the connector 4 in contact with the front end surface 14A of the rear shaft 14. are screwed together, the connector 4 is pressed against the front end surface 14A of the rear shaft 14,
The mechanism body is housed in a fixed position between the front shaft 12 and the rear shaft 14.

With this structure, the total length of the front axle 12 is the same as that of the rear axle 1.
4 or longer than the entire length of the rear shaft 14.

Although not shown, an outer spring may be provided between the front shaft and the outer stage of the cap screwed into the connector without detracting from the effects of this invention.

With this device constructed as described above, the mechanism body can be replaced simply by removing the front and rear axles, and by preparing mechanism bodies with different core diameters, only one exterior core is used, but the core diameter is different. The knock-type mechanical pencil is assembled without any wobbling in the mechanical parts, and the cap is housed inside the front shaft, creating a product with a new design that is completely different from conventional products. It has revolutionary effects such as being able to create

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing this invention. 1... Core, 2... Core holder, 3... Tagane, 4...
- Connector, 4A... Rear end surface of connector 4, 5... Tightening ring, 6... Chuck spring, 7... Chuck, 7A... Tapered surface of chuck 7, 8... Core Tank, 8A... Rear outer surface of lead tank 8, 8B... Rear inner surface of lead tank 8, 9... Knob, 10... Eraser case, 11... Eraser, 12... Front shaft, 13.
...Outer spring, 14... Rear shaft, 14A... Front end surface of rear shaft 14.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A tightening ring 5 is loosely fitted into a base 3 which has a built-in lead holder 2 for lightly holding the lead 1, and a chuck is provided between the connector 4 and the chuck 7. The chuck 7 is pressed against the tightening ring 5 by the spring 6.
In the knock-type mechanical pencil, an elastic body is provided between the front shaft 12 and the cap 3 or the connector 4 to which the cap 3 is screwed, and the mechanism body is usually screwed to the front shaft 12. A knock-type mechanical pencil that is pressed into contact with the rear shaft 14. 2. A knock-type mechanical pencil according to claim 1, in which the elastic body is constituted by an outer spring 13.