JPH0226696Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knock-type mechanical pencil in which a prong is attached to the knob.

For knock-type mechanical pencils, a needle was essential to remove the short lead left inside the cap, but conventionally, a wire-shaped needle was bent into a U shape and the short leg was placed against the inner surface of the knob. It was installed close to each other. Therefore, in the case where the curved part provided in the middle of the long leg of the prong is pressed against the inner surface of the lead tank and the knob is removably attached to the lead tank, when the knob is removed, the prong needle remains on the lead tank side and the knob is removed. It had the disadvantage that it could easily come off. In addition, in the case where the needle was to be attached securely, the inside of the knob had to have a complicated shape, resulting in very poor productivity.

The purpose of this invention is to provide a screw-type sharp pencil in which a screw groove is provided inside the knob, and by locking the short leg of the needle in the screw groove, the needle can be securely attached to the knob without coming off. It is something.

The structure of this invention is explained based on the drawings.
As shown in FIG. 1, the inside of the knob 1 is composed of a first hole 1A having a slightly larger diameter than the outer diameter of the wick tank 2, and a second hole 1A having a smaller diameter than the outer diameter of the wick tank 2.
The hole is provided with a screw groove 1B. The needle 3 is bent into a slightly widened U-shape, and has one long leg 3A and the other short leg 3B. Further, a curved portion 3C is formed approximately in the middle of the long leg 3A. This needle 3 is bent at the part 3D.
If you push it into the knob 1 from the side, the end 3E of the short leg 3B
is locked in the screw groove 1B of the knob 1 and is securely attached without coming off. The knob 1 constructed in this way is connected to a core tank 2 with a chuck fixed to the front part.
To attach the needle 3 to the wick tank 2, first attach the needle 3 to the wick tank 2.
By inserting the needle into the hole 2A of the needle 3, pressing the curved portion 3C of the needle 3 against the inner surface 2B of the lead tank 2, and placing the first hole 1A of the knob 1 over the rear part 2C of the lead tank 2, a knock-type sharp pencil is constructed. .

Furthermore, as shown in FIG.
The bent portion 13D of the protrusion needle 13 is press-fitted, and the end portion 13E of the short leg 13B is engaged with the threaded groove 11B. 13C, the knob 11 may be placed on the core tank 12, and the front end 11C of the knob 11 may be brought into contact with the outer contact stage 12D. Alternatively, as shown in FIG. A screw groove 21B is provided on the entire surface, and the bent part 23D of the prong 23 is press-fitted into the hole of the knob 21, and the end 23E of the short leg 23B is inserted into the screw groove 21.
Furthermore, the outer diameter of the front part 21D of the knob 21 is configured to be slightly smaller than the hole 22A of the lead tank 22, and the curved part 23C of the prong needle is pressed against the inner surface 22B of the lead tank 22, and the lead tank 2
The front part 21D of the knob 21 may be inserted into the hole 22A of the knob 21.

The invention described above provides a threaded groove on the inner surface of the knob, press-fits the bent part of the prong into the knob, and engages the short end of the prong with the threaded groove of the knob. The feature is that it is installed in a fixed position.

Due to this, despite the simple configuration,
The needle can be securely attached to the knob, and there is no chance of the knob coming off and spilling the lead in the lead tank or losing the knob, which has a great practical effect compared to the conventional sharpening pencil. It is something.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a lock-type mechanical pencil of this invention, and FIGS. 2 and 3 are longitudinal cross-sectional views of main parts showing other embodiments of this invention. 1, 11, 21...knob, 2, 12, 22...
Core tank, 3, 13, 23... needle.

Claims (1)

[Scope of utility model registration request] In a knob-type sharp pencil that gradually draws out the lead by advancing a chuck fixed to the front of the lead tank, a screw groove is provided on part or all of the inner surface of the knob, and the needle is bent into a U-shape. Press the curved part into the knob, attach the end of the short leg of the prong to the screw groove of the nozzle, press the curved part provided approximately in the middle of the long leg of the prong against the inner surface of the wick tank, and insert the prong into the knob. A knob-type sharpening pencil that features a knob attached to the rear of the tank.