JPH0243753Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knock-type sharp pencil whose lead is gradually drawn out by knocking a knob.

Conventional knock-type sharp pencils have disadvantages such as the chuck and lead tank being fixed together, making it troublesome to install the spring, and requiring separate parts to fix these parts to the shaft, making it difficult to manufacture at a low cost. It had

Furthermore, since a wide space is created between the lead holder built into the cap and the chuck, the shortened lead gets into the space and prevents the next lead from following, and the short lead must be removed by removing the cap. It didn't happen.

This invention solves the above-mentioned conventional drawbacks, and by configuring the chuck separately from the core tank, and configuring the chuck to be biased by a spring and in contact with the tightening ring, it can be manufactured at low cost with fewer parts. In addition, it is an object of the present invention to provide a lock-type mechanical pencil that allows the next lead to follow reliably.

The structure of this invention will be explained based on FIG. 1.
into the front part 3A of the shaft 3, and the locking part 2B of the base 2.
A tightening ring 4 is loosely fitted between the front end 3B of the shaft 3 and the front end 3B of the shaft 3. On the other hand, a cylindrical part 5A is formed at the front part of the chuck 5, and a head part 5B and a lead holding part 5 are formed at the rear part.
C, and the rear part is divided into several parts and configured to be self-expandable. This chuck 5 is loosely fitted into the base 2 so as to be able to slide appropriately in the axial direction, and a spring 6 is stretched between the chuck 5 and the inner stage 2C of the base 2.
The head 5B of the chuck 5 is brought into contact with the tightening ring 4 to close the lead holding part 5C of the chuck 5, and the lead 7 is closed.
Strongly hold and compose. A locking window 3C is provided at the rear of the shaft 3, and an elastic piece 8A of the knob 8 is attached to the locking window 3C.
Attach by dropping the protrusion 8B provided at the tip of the. At the front of the knob 8 is a pipe-shaped wick tank 9.
Press fit into the inner hole 9 of the wick tank 9 at the rear of the knob 8.
An opening hole 8C is formed which communicates with A and through which the lead 7 can be inserted, thereby forming a click-type sharp pencil. However, the wick tank does not necessarily have to be press-fitted into the knob, and there is no problem if it is loosely fitted between the chuck and the knob.

In the grip type sharp pencil constructed as described above, by pressing the knob 8, the chuck 5 holding the lead 7 is advanced at the front end 9B of the lead tank 9, the lead 7 is drawn out, and the tightening ring 4 is moved to the base 2. The head 5 of the chuck 5 is brought into contact with the locking stage 2B of the chuck 5.
Remove from B and expand chuck 5. Next, when the pressing force of the knob 8 is released, the chuck 5 retreats due to the elastic force of the spring 6, and the head 5 of the chuck 5
B comes into contact with the tightening ring 4, the chuck 5 is closed, and the core 7 is strongly held. Moreover, since the cylindrical part 5A is provided at the front of the chuck 5, the shortened lead 7 is reliably guided to the lead holder 1 by the cylindrical part 5A and is ejected from the tip hole 2D of the cap 2. Ru.

Note that the structure for attaching the base to the shaft is not limited to press-fitting, and there is no problem in attaching it by screwing it together.

FIG. 2 shows another embodiment of this invention, in which the crown 10 is screwed onto the rear part of the shaft 13, and the outer flange 1 of the knob 18 is disposed between the inner stage 13D of the shaft 13 and the crown 10.
8D is loosely fitted, a pipe-shaped core tank 19 is press-fitted into the front part of the knob 18, and the rear part of the knob 18 has an opening hole 18C that communicates with the inner hole 19A of the core tank 19 and into which the core can be inserted. This is a knock-type mechanical pencil.

The invention constructed as described above is characterized in that a chuck is constructed separately from the core tank, and the chuck is biased by a spring to abut against the tightening ring.

This reduces the number of parts, allows the spring chuck and lead tank to be easily installed inside the shaft, making it extremely inexpensive to manufacture, and also ensures that the shortened lead is ejected from the tip hole of the mouthpiece and used for the next lead. can be followed, and has a great practical effect compared to conventional mechanical pencils.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a lock-type mechanical pencil of this invention, and FIG. 2 is a longitudinal cross-sectional view of the main part showing another embodiment of this invention. 1... Core holder, 2... Base, 3, 13...
...Shaft, 4...Tightening ring, 5...Chuck, 6...
Spring, 7... Core, 8, 18... Knob, 9,
19... Core tank, 10... Head crown.

Claims (1)

[Scope of utility model registration request] A cap provided with a lead holder and attached to the front of the shaft, a tightening ring loosely fitted between the locking stage of the cap and the shaft, and a cylindrical portion formed at the front and a groove cut in the axial direction at the rear. It consists of a chuck which is divided into several parts and has a head and a core holding part formed at the rear part thereof,
A chuck is loosely fitted into the cap so as to be able to slide appropriately in the axial direction, and a spring stretched between the cap and the chuck causes the head of the chuck to abut against the tightening ring to close the rear part of the chuck; The lead is held by the lead holding part of the chuck, a knob is attached to the shaft so as to be slidable in the axial direction, and the lead tank is positioned between the knob and the chuck, so that the knob is moved forward in the axial direction. A knob-type sharp pencil characterized in that when pressed, the knob, lead tank, and chuck are linked to move forward in the axial direction to draw out the lead.