JPH0214461Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sharp pencil that can perform continuous writing by pulling out the lead from the chuck when the slider, which retreats as the lead wears out, returns to its original position.

This type of sharpening pencil has a slider that is biased forward by an elastic member such as a spring and is placed inside the barrel, and is equipped with an elastic body made of rubber or the like that imparts slight elasticity to the core, and the slider is biased forward by an elastic member such as a spring. A ball chuck device is installed that allows the core to move forward but prevents it from retreating, so that when the slider returns to its original position as the core wears out
In front of the slider, the core is held by the elasticity of the elastic body so that it can be pulled out from the ball chuck device.
The backward movement allows continuous writing. However, in the case of the aforementioned sharp pencil, the chuck is always closed regardless of whether the slider moves forward or backward, so even though the lead already held in the elastic body of the slider can be pulled out from the chuck, It is not possible to use a new core, such as a second one. Therefore, this type of sharp pencil requires a separate lead feeding mechanism for feeding a new lead, such as the second lead mentioned above, into the chuck and slider.

Therefore, the present invention has been devised so that when the slider, which retreats as the lead wears out, returns, the chuck also moves forward and expands, thereby eliminating the need for a separate lead feeding mechanism, which was previously considered indispensable. The purpose of the present invention is to provide a sharpening pencil that allows a second new lead to be used without any problems.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

Reference numeral 1 is a shaft cylinder consisting of a front shaft 1a and a rear shaft 1b. 2 is a slider comprising a core protection tube 3 and an elastic body 4 such as rubber that imparts slight elasticity to the core;
It is biased forward by an elastic member 6, such as a spring, disposed between the front shaft 1a and a seat provided within the front shaft 1a, and is slidably disposed within the front shaft 1a. 7 is a ball chuck device, and this ball chuck device 7 has a ball 8 and a core holding surface 9a roughened by tapping or the like on the inner surface of the front part, and the front part is divided into two parts, three parts, etc. a chuck 9 which is divided and has a ball catch 9b on its front outer surface;
A ring 10 is mounted on the chuck 9; and a resilient member such as a spring is disposed between the chuck 9 and the ring 10 so as to press the chuck 9 into contact with the ball guide surface 10a of the ring 10 via the ball 8. 11, and in this example, the ring 10 is press-fitted into the front of the rear shaft 1b, fixed by means such as adhesive, and the ball chuck device 7 is arranged, but the ring 10 is integrated with the rear shaft 1b. It may also be configured as follows. Reference numeral 12 denotes a core storage section provided within the rear shaft 1b. Furthermore, in the present invention, in addition to the above-mentioned configuration, magnetic bodies 13 and 14 are press-fitted into the rear part of the slider 2 and the front part of the chuck 9, respectively.
It is fixed by adhesive or other means. This magnetic material 1
The embodiments 3 and 14 can be changed in various ways, for example, one of the slider 2 and the chuck 9 may be provided with a magnetic material, and the other may be made of a magnetic material, or either the slider 2 or the chuck 9 may be provided with a magnetic material. It is also possible to magnetize both without providing a magnetic body.In short, it is sufficient that the slider 2 and the chuck 9 are placed facing each other, and that when they approach each other, a magnetic force is generated that attracts each other.

Next, the effect will be explained.

First, if you write by pressing the lead protection tube 3 against a paper surface etc. in the state shown in Fig. 1, the lead retention force of the chuck 9 will increase due to the wedge action, and the lead will not retreat, and the lead will not retreat as the lead wears out during writing. The elastic body 4 slides on the surface of the core, and the slider 2 retreats while being in contact with the paper surface. Next, as shown in Fig. 2, if the slider 2 is prevented from retreating by the front end of the chuck 9, or if the pen pressure is released while the slider 2 approaches the chuck 9, the slider 2 carries the lead as shown in Fig. 3. Of course, the chuck 9 is also carried along by the magnetic force of the magnetic bodies 13 and 14, and returned to its original state by the elastic force of the compressed elastic member 6. The taken chuck 9 rides on the protrusion 5a of the catch seat 5 of the front shaft 1a and expands, and then its forward movement is prevented, and both the elastic force of the compressed elastic member 11 and the magnetic bodies 13 and 14 The balance with the magnetic force acting between them is resolved and the state returns as shown in Figure 1.

In the above example, the elastic force of the compressed elastic member 11 was set to be stronger than the magnetic force acting between the magnetic bodies 13 and 14 when the chuck 9 moved forward to its maximum extent. The forward stroke of the slider 2 is set to be larger than the forward stroke of the chuck 9 as shown in FIG. After the chuck 9 is expanded, it may be returned to its original position by the elastic force of the elastic member 11. Also, check 9
In this example, the chuck 9 is forcibly expanded by causing the chuck to ride on the protrusion 5a of the catch seat 5, but if the chuck 9 has sufficient self-expanding force, the protrusion 5a This is not necessarily necessary, and instead of restricting the forward movement of the chuck 9 using the catch, a step may be provided on the inner surface of the ring 10 and the forward movement of the chuck 9 may be restricted by this step.

As described above, in the present invention, when the slider, which retreats as the core wears out, returns, the chuck also moves forward and expands, so the core can be dropped by its own weight to the elastic body. ,
It becomes possible to use a new lead, such as a second one, without requiring a separate lead feeding mechanism, which has been considered indispensable in the past. Furthermore, since the chuck expands each time the slider moves back and forth, the lead can be quickly pulled out of the chuck by the slider without any trouble, which is very effective.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIGS. 2 and 3 are operation explanatory diagrams, and FIG. 4 is a longitudinal sectional view showing another embodiment. 1... Shaft tube, 2... Slider, 4... Elastic body, 6... Elastic member, 7... Ball chuck device, 13, 14... Magnetic body.

Claims (1)

[Scope of utility model registration request] An elastic body is provided on the slider, which is biased forward by an elastic member and placed inside the tip of the barrel, and a chuck device is placed behind the slider to allow the core to move forward but prevent it from retreating, thereby preventing wear and tear on the core. A sharp pencil that enables continuous writing by carrying the lead with the slider when it returns to its original position, which retreats along with the movement of the slider. A sharp pencil in which a magnetic body is provided at each of the sliders, and when the slider returns, the chuck is carried in an expanded state by the magnetic force of the magnetic body.