JPS6220315Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lock-type pencil pencil in which the body and sheath are in contact when being carried, and when writing, the body and sheath are extended and the lead is drawn out by knocking the sheath.

Conventional knob-knock-type sharp pencils are known as knob-knock-type sharp pencils, in which the tip is drawn out by knocking a knob protruding from the rear end of the sheath in order to move the chuck forward and draw out the lead, and in other types, the tip is drawn out by clicking on a knob that protrudes from the rear end of the sheath, or in a cap that is thicker in diameter than the barrel. A cap-slide mechanical pencil that lets out the lead was commercially available. However, the knob of the knob-knock style pencil pencil has a knob that protrudes from the rear end of the sheath, which seriously spoils its appearance, and it is difficult to set it up with a fountain pen that matches its appearance. Therefore, a cap slide type sharp pencil is commercially available as a set product with a fountain pen, but the sheath of this pencil is also larger in diameter than the barrel, and the image is quite different from that of a fountain pen.
In addition, in conventional mechanical pencils where the barrel and sheath expand and contract, the barrel and sheath are held together by a C-ring with a C-shaped cross section, so if the pencil is expanded and contracted frequently, the C-ring will wear out and its elasticity will weaken. This had the disadvantage that it could not be locked.

As a result of careful consideration, the inventor of this application found that the body and sheath were the same diameter, the core tank and sheath were able to slide, and the inner magnet, which repelled each other with a stronger force than the spring, was used as the core tank, and the outer magnet was used as the sheath. They are constructed by being fixed to each other. Therefore, if the outer magnet is positioned in front of the inner magnet when carrying, the sheath will be biased forward in the axial direction and come into contact with the body, and if the outer magnet is positioned behind the inner magnet when writing, the sheath will be biased forward in the axial direction and come into contact with the body. To provide a knock-type sharp pencil which is biased rearward in the axial direction so that the inner flange of the sheath comes into contact with the outer flange of a lead tank, an appropriate gap is provided between the body and the sheath, and the lead can be drawn out by knocking the sheath. It is intended for this purpose.

The structure of this invention will be explained based on the drawings. In FIG. 1, a tightening ring 2 is fitted onto the head 1A of the chuck 1, and the tightening ring 2 is slidable within the connector 3 by an appropriate distance. It is loosely fitted. A core tank 4 having an outer collar 4A is fixed to the rear of the chuck 1, and by springing a spring 5 between the connector 3 and the core tank 4, the head 1A of the chuck 1 is pressed against the tightening ring 2. Closed core 6
It is configured to hold. A cap 8 with a built-in core holder 7 is screwed onto the connector 3, and an inner stage 9A of the body 9 is inserted between the rear end of the cap 8 and the outer flange 3A of the connector 3.
is being held. Furthermore, a ring-shaped inner magnet 10 is fixed to the outer surface of the core tank 4, with the front being an S pole and the rear being an N pole, while the inner surface of the sheath 11 is
A ring-shaped outer magnet 12 is fixed to 1A, with the front being a N pole and the back being an S pole, and the repulsive magnetic force between the inner magnet 10 and the outer magnet 12 is stronger than the elastic force of the spring 5. . Therefore, when carrying, the sheath 11 is pressed with strong force and moved forward, and the outer magnet 1 is moved forward.
2 is positioned in front of the inner magnet 10, the sheath 11 is biased forward by the repulsive force between the outer magnet 12 and the inner magnet 10, and the front part 11 of the sheath 11 is pushed to the rear end 9B of the body 9.
B is brought into contact and locked. Also, when writing, sheath 1
1 is moved rearward with strong force and the outer magnet 12 is positioned rearward than the inner magnet 10, the repulsive force between the outer magnet 12 and the inner magnet 10 causes the inner flange 11C of the sheath 11 to move against the outer flange 4A of the core tank 4. A suitable gap is formed between the body 9 and the sheath 11. If you knock the sheath 11 in this state, since the repulsive force between the inner magnet 10 and the outer magnet 12 is set to be stronger than the spring 5,
The spring 5 is compressed, the chuck 1 moves forward together with the lead tank 4, and the lead 6 is drawn out in the same way as a normal lock-type sharp pencil. When replenishing the core 6, the crown 1 fitted to the rear part 11D of the sheath 11
3 to expose the rear part 4C of the lead tank 4, and by removing the eraser 14 fitted to the rear part 4C of the lead tank 4, the lead 6 can be replenished. If you then want to carry it around, press the sheath 11 with strong force as described above and move it forward, positioning the outer magnet 12 in front of the inner magnet 10, so that the outer magnet 12 and the inner magnet 10 are separated. The sheath 11 is biased forward by the repulsive force, and the front portion 11B of the sheath 11 comes into contact with the rear end 9B of the body 9, returning to the state shown in FIG.

As explained above, in this invention, the body and sheath of the same diameter are in contact when carried, and the knob does not protrude from the rear end of the sheath, so the appearance is greatly improved and it is easy to set with a fountain pen. It's easy to do. Also, since the sheath can be separated from the body when writing, the core can be drawn out by knocking the sheath. Moreover, by fixing the inner magnet to the core tank and fixing the outer magnet, which repels the inner magnet with a force stronger than the spring, to the sheath, the body and sheath can be brought into contact, and an appropriate gap can be created between the body and sheath. So,
Compared to a system in which the core tank and sheath are locked by fitting a ring with a C-shaped cross section on the sheath into the concave part of the core tank, this design has significantly improved durability, has a simpler shape, and is extremely unlikely to break down. It has superior effects compared to conventional mechanical pencils.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the lock-type mechanical pencil of this invention in a writing state, and FIG. 2 is a vertical cross-sectional view showing the lock-type mechanical pencil of this invention in a carrying state. 1...chuck, 1A...head of chuck 1,
2... Tightening ring, 3... Connecting tool, 3A... Outer flange of connecting tool 3, 4... Core tank, 4A... Core tank 4
outer flange, 4B...outer surface of the core tank 4, 4C...rear part of the core tank 4, 5...spring, 6...core,
7... Core holder, 8... Cap, 9... Body, 9A
...Inner stage of the body 9, 9B... Rear end of the body 9, 10...
Inner magnet, 11...sheath, 11A...inner surface of sheath 11,
11B...front part of the sheath 11, 11C...inner flange of the sheath 11, 11D...rear part of the sheath 11, 12...outer magnet,
13... Crown, 14... Eraser.

Claims (1)

[Scope of utility model registration request] A knock-type sharp pencil that has a chuck 1 that is pushed backward by a spring 5 and a tightening ring 2 that is fitted onto the chuck 1 and opens and closes the chuck 1, and that draws out the lead 6 by moving the chuck 1 forward. , the core tank 4 and the sheath 11 are configured to be able to slide back and forth in the axial direction, and the inner magnet 10 is fixed to the outer surface 4B of the core tank 4, and the outer magnet 12 is fixed to the inner surface 11A of the sheath 11.
0 and the inner magnet 1 so as to be repelled in the axial direction.
The repulsive magnetic force between the outer magnet 12 and the outer magnet 12 is set to be stronger than the elastic force of the spring 5, and the outer magnet 1 is stronger than the inner magnet 10.
2 is located at the rear, the inner flange 11C of the sheath 11 comes into contact with the outer flange 4A of the core tank 4 due to the repulsive force of the inner magnet 10 and the outer magnet 12, creating a gap between the body 9 and the sheath 11, On the other hand, when the outer magnet 12 is located in front of the inner magnet 10, the repulsive force between the inner magnet 10 and the outer magnet 12 causes the sheath 11 to spring forward and come into contact with the body 9, causing the body 9 and the sheath to A knock-type sharp pencil characterized in that the outer diameters of the contact portions of No. 11 are configured to be the same.