JP2000289382A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the appearance by unifying a mouthpiece and a lead holder to be transparent, and at the same time, facilitate the finding of a short broken lead by making the mouthpiece comprising a transparent synthetic resin contain the lead holder comprising a transparent elastic body in a mechanical pencil wherein a lead is fed out by advancing a chuck. SOLUTION: To a chuck 1 made of a transparent synthetic resin, a lead tank 2 made of a transparent synthetic resin pipe is connected, and also, a clamping ring 3 is fitted on the head section 1A of the chuck 1, and at the same time, a spring 5 is bridged between a connector 4 which receives the clamping ring 3 and the lead tank 2. Also, leads 7 are housed in the lead tank 2. In addition, the connector 4 is pinched by the front end of a barrel cylinder 8 having a front section hole 8A through which the lead tank 2 passes, and the internal step 9A of a mouthpiece 9 which is screwed with the barrel cylinder 8. In this case, the barrel cylinder 8 and the mouthpiece 9 are respectively formed of transparent synthetic resins. Then, in the mouthpiece 9, a lead holder 10 comprising an elastic body such as rubber, which holds the lead 7 is built in, and at the same time, the lead holder 10 is formed of a transparent silicon rubber or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil in which a lead holder for holding a lead with an appropriate force is made of a transparent elastic material.

[0002]

2. Description of the Related Art A conventional mechanical pencil has a core holder made of black rubber or the like.

[0003]

Therefore, when the base is made of a transparent synthetic resin, only the core holder is conspicuous and impairs the appearance.

[0004] In addition, it is very difficult to find a short broken core clogged in the core holder.

An object of the present invention is to provide a mechanical pencil which solves the above-mentioned problems.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a mechanical pencil for feeding a lead by advancing a chuck, wherein a lead holder, which is built in a transparent synthetic resin base and holds the lead with an appropriate force, is made of a transparent elastic material. Consist of body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a mechanical pencil according to the present invention will be described below with reference to FIGS. A chuck 1 made of a transparent synthetic resin, a core tank 2 made of a transparent synthetic resin pipe connected to the chuck 1, a tightening ring 3 externally fitted to the head 1A of the chuck 1, and a connector for receiving the tightening ring 3 4 and a spring 5 stretched between the connecting tool 4 and the core tank 2 constitute a mechanical unit of the mechanical pencil. A core 7 that can be erased with an eraser 6 in the core tank 2
Is stored. Further, a front hole 8A of the barrel 8 is formed so that the core tank 2 of the mechanical part can be inserted therethrough, and the connection is made by the front end of the barrel 8 and the inner step 9A of the base 9 screwed to the front of the barrel 8. Hold the tool 4. The barrel 8 is made of a transparent synthetic resin, and the base 9 is made of a transparent synthetic resin. In the base 9, a lead holder 10 made of an elastic body such as rubber for holding the lead 7 with an appropriate force is incorporated. The material of the core holder 10 is preferably a transparent silicone rubber or a transparent thermoplastic elastomer.

A non-slip grip 11 made of a transparent thermoplastic elastomer, preferably a styrene-based elastomer, or a transparent silicone rubber is attached to the front narrow diameter portion 8B of the barrel 8. Therefore, the consumed amount of the core 7 during use can be visually observed through the transparent barrel 8 and the transparent grip 11.

The crown 12 has a clip 13 integrally formed on the upper side and a small diameter portion 12A formed on the front. A protrusion 12B is formed on the outer peripheral surface of the small-diameter portion 12A immediately below the clip 13, and a protrusion 12C extending in the longitudinal direction is formed on the outer peripheral surface opposite to the protrusion 12B. Further, opening windows 12D extending in the longitudinal direction are formed on both sides of the small-diameter portion 12A so as to face each other, and the projections 12B are configured to be elastically deformable as appropriate. Moreover, the crown 12 and the clip 13 are made of a transparent synthetic resin.

The head crown 12 has a small-diameter portion 12A inserted from the rear end of the barrel 8, and is inserted into a key groove 8C of the barrel 8.
Are fitted. Further, when the small diameter portion 12A of the crown 12 is inserted, the projection 12B of the crown 12
And the crown 12 is fixed to the shaft cylinder 8.

A front inner hole 14A of an eraser support 14 inserted from the rear end of the barrel 8 is fitted into the rear portion of the core tank 2. The eraser support 14 is made of a transparent synthetic resin, and the eraser 6 is attached to a rear inner hole 14B of the eraser support 14. Further, a knob 15 made of a transparent synthetic resin for covering the eraser 6 is fitted to the rear outer side 14C of the eraser support 14, and the eraser 6 is configured to be visible from the outside of the knob 15.

Moreover, the knob 15 is formed by dispersing an ultraviolet absorber in a transparent synthetic resin, so that the eraser 6 can be prevented from being deteriorated by ultraviolet rays.

[0013] Benzoate-based ultraviolet absorbers,
Benzophenone type, salicylate type, benzotriazole type, cyanoacrylate type, hindered amine type and the like can be mentioned.

As the transparent knob 15, one in which an ultraviolet absorbent is dispersed in a synthetic resin is preferably used. In addition, a liquid of the ultraviolet absorbent is applied to the surface of the transparent knob 15 made of synthetic resin. It is also possible to constitute the ultraviolet absorber by coating or baking.

Further, if the ultraviolet absorbent is dispersed in the transparent barrel 8, the deterioration of the colored core can be prevented when the colored core in which the core 7 is impregnated with a dye is used.

As the colored core, a material obtained by impregnating a dye into a calcined core composed of boron nitride and a binder such as clay or silica, which can be erased with an eraser, can be considered.

FIG. 3 shows a second embodiment of the present invention. The same members as those in FIG. 1 are denoted by the same reference numerals, and their description is omitted. A core holder 110 built in a transparent synthetic resin base 109 is made of a transparent synthetic resin, and a core 7 is held at a front portion of the core holder 110 by a plurality of divided elastic pieces 110A. It is.

FIG. 4 shows a third embodiment of the present invention. The same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. A core holder 210 made of transparent synthetic resin is fixed to the rear part of the metal core guide pipe 16, and a plurality of divided elastic pieces 210A are formed at the rear part of the core holder 210, and the core 7 is formed by the elastic pieces 210A. It is configured to hold. The core guide pipe 16 and the core holder 210 are slidably incorporated in a base 209 made of transparent synthetic resin in a longitudinal direction, and the elastic piece 210B of the core holder 210 is
9 is in frictional contact with the inner surface with an appropriate force.

[0019]

According to the mechanical pencil of the present invention described above, the core holder incorporated in the transparent base is made of a transparent elastic material, so that the base and the core holder are unified to be transparent and the appearance is improved. In addition, even when the broken core is short and becomes clogged in the core holder, an effect that can be easily found can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a mechanical pencil according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part of a mechanical pencil according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a mechanical pencil according to a third embodiment of the present invention.

[Explanation of symbols]

 1 chuck 7 core 9 base 10 core holder 109 base 110 core holder 209 base 210 core holder

Claims (4)

[Claims] 1. A mechanical pencil which feeds a lead by advancing a chuck, wherein a lead holder built in a transparent synthetic resin base and holding the lead with an appropriate force is constituted by a transparent elastic body. Mechanical pencil. 2. A mechanical pencil for feeding a lead by advancing a chuck, wherein a lead holder built in a transparent synthetic resin base and holding the lead with an appropriate force is constituted by a transparent elastic body. A mechanical pencil made of transparent synthetic resin. 3. The mechanical pencil according to claim 1, wherein the lead holder is made of transparent silicon rubber. 4. The mechanical pencil according to claim 1, wherein the core holder is made of a transparent thermoplastic elastomer.