JPS5837668Y2 - Knock-type sharp pencil with cap - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knock-type mechanical pencil with a cap that engages a knob with a core provided inside the cap.

Conventional knock-type mechanical pencils with caps fit the cap onto the knob, so when the cap is removed from the knob, the knob also comes off, or there is excessive movement in the axial direction between the knob and barrel. Also, it has drawbacks such as a protrusion that is visible on the knob for determining the mounting position of the cap.

This invention eliminates these drawbacks and is a knock-type mechanical pencil with a cap that can be obtained through simple assembly.This invention will be explained based on the drawings.Figure 1 shows that the cap 1 protrudes from the rear end of the barrel 2. It is a diagram showing the outer pipe 3 being fitted.

To explain in more detail, inside the shaft tube 2, there is constructed a middle hanging body equipped with a chuck mechanism for gradually feeding out the core.

A square hole 4A is formed at a suitable position in the core tank 4 located at the rear of the middle hanging body, and a projection 3A provided on the inner wall of the outer pipe 3 is inserted into the square hole 4A.

The outer diameter of the outer pipe 3 attached in this manner is smaller than the inner diameter 2A of the shaft cylinder 2, and is configured to be able to slide inside the shaft cylinder.

Furthermore, as shown in FIG. 2, a protrusion 3B is provided on the rear circumferential surface of the outer pipe 3 for fitting with the cap 1, and the inner diameter of the cap 1 is removably tightly fitted into the protrusion 3B.

Further, a knob 5 is fitted and locked to the small diameter stepped portion 3C rearward of the protrusion 3B.

The knob head 5A is brought into contact with the front end 6A of the core 6 fixed inside the cap, and has a length greater than the knock movement distance between the cap opening end 1A and the rear end 2B of the shaft tube 2. It is composed of

In the knock-type mechanical pencil with a cap configured in this way, when the cap 1 is removed from the tip of the barrel and fitted into the protrusion 3B at the rear of the outer pipe 3, the core 6 inside the cap 3 will fit into the head 5A of the knob 5. The cap 1 can be knocked and the lead can be drawn out because the cap 1 is in contact with the cap 1 and there is a longer distance between the barrel rear end 2B and the cap opening end 1A than the knock movement distance.

In addition, the knock of the cap 1 pushes the core tank 4, which is a part of the middle hanging body, through the core 6, the knob 5, and the outer pipe 3, so there is no unnecessary movement in the axial direction, and the cap 1 is locked with the cap 1. The protrusions for this purpose do not appear on the outside.

In addition, when removing the cap, there is no need to worry about the knob coming off, and at the same time it has a beautiful appearance, and can be assembled very easily by press-fitting or dropping, without having to perform complicated assembly processes such as gluing and screwing. This has a great practical effect.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of the main part of this invention, and Fig. 2 is a perspective view of the outer pipe of this invention. 1...Cap, 1A...Cap 1
Opening end of 2... shaft cylinder, 2A... inner diameter of shaft cylinder 2, 2B... rear end of shaft cylinder 2, 3...
...Outer pipe, 3A...Protrusion of outer pipe 3, 3
B...Convex strip of outer pipe 3, 3C...Small diameter stepped portion of outer pipe 3, 4... Core tank, 4A.
... Square hole of core tank 4, 5 ... Knob, 5
A: Head of knob 5, 6: Core, 6
A...Front end of core 6.

Claims (1)

[Scope of utility model registration request] In a knock-type mechanical pencil with a cap configured such that the cap 1 is inserted and fitted to the outer pipe 3 protruding from the tip of the barrel 2 and the rear end 2B of the barrel 2 having a base at the tip, the cap is fixed to the lead tank 4. The outer pipe 3 is configured to be slidable inside the rear end 2B of the shaft cylinder 2, and a protrusion 3B is provided at an arbitrary position on the outer peripheral surface of the outer pipe 3, and a small diameter stepped portion 3C is formed. The cap 1 is fitted with the knob 5 in the small diameter stepped portion 3C, and when the front end 6A of the core 6 fixed inside the cap 1 and the head 5A of the knob 5 come into contact, the cap 1
A knock-type mechanical pencil characterized in that a gap longer than the length of the knock movement is formed between the opening end 1A and the rear end 2B of the shaft tube 2.