JP4070313B2 - Transparent cap for mechanical pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical cap for a mechanical pencil for covering an eraser attached to the mechanical pencil.
[0002]
[Prior art]
Conventionally, by making the cap covering the eraser transparent, the appearance of the mechanical pencil is improved and the eraser is configured to be visible.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned transparent cap for mechanical pencils, when carried in a pocket of clothes, etc., would cause the eraser to deteriorate and harden when exposed to ultraviolet rays, and the erasability would be significantly deteriorated.
[0004]
An object of this invention is to provide the transparent cap for mechanical pencils which eliminates the said subject.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a transparent cap for covering an eraser mounted so as to protrude from the rear end of a mechanical pencil shaft tube, and an ultraviolet absorber is dispersed in a synthetic resin constituting the transparent cap. This is the first gist.
A second gist of the present invention is that a transparent cap for covering an eraser mounted so as to protrude from the rear end of the mechanical pencil barrel is provided by applying or baking an ultraviolet absorber to the transparent cap.
[0006]
Examples of ultraviolet absorbers include benzoate-based, benzophenone-based, salicylate-based, benzotriazole-based, cyanoacrylate-based, hindered amine-based, etc., and any of them may be used, but in particular from the viewpoint of transparency, white-based benzoate The product name [TINUVIN 770 DF] manufactured by Hinomaru Synthetic Resin Industry Co., Ltd. is preferred.
[0007]
Any material may be used for the cap as long as it is a resin. For example, polypropylene, polyvinyl chloride, polystyrene, ABS, polycarbonate, acrylic, polyethylene terephthalate, and the like can be mentioned. From the viewpoint of fitting the cap, polypropylene is preferable.
[0008]
A transparent cap for mechanical pencils is preferably used in which an ultraviolet absorber is dispersed in a resin. In addition, an ultraviolet absorber liquid is applied to the transparent cap surface of the resin or baked on the surface. An absorbent may be provided .
[0009]
The ultraviolet absorber selectively absorbs the ultraviolet part of sunlight and artificial light and converts it into harmless heat energy, not only preventing the eraser from deteriorating, but also yellowing of the resin itself or deterioration of mechanical properties. Is to prevent.
[0010]
【Example】
FIG. 1 shows a first embodiment of the present invention. An eraser 5 is fitted to a rear inner side 4A of an eraser support 4 provided in a core tank 3 that slides in a shaft cylinder 1 and accommodates a core 2 therein. Combined. Accordingly, the eraser 5 is mounted so that the eraser 5 protrudes from the rear end of the shaft tube 1. Further, a transparent cap 6 that covers the eraser 5 is fitted to the rear outer side 4 </ b> B of the eraser support 4.
[0011]
The transparent cap 6 is made of a transparent polypropylene resin, and a product name [TINUVIN 770 DF] manufactured by Hinomaru Synthetic Resin Industry Co., Ltd. is dispersed as an ultraviolet absorber in the resin.
[0012]
Accordingly, even if the mechanical pencil is carried in the pocket of clothes and the transparent cap 6 is exposed to ultraviolet rays, the ultraviolet rays are cut by the ultraviolet absorbent formed in the transparent cap 6, so that the eraser 5 is not likely to deteriorate. is there.
[0013]
FIG. 2 shows a second embodiment of the present invention, in which an eraser 5 is fitted into the rear inner side 11A of the shaft cylinder 11 which accommodates the core 2, and the eraser 5 is projected from the rear end of the shaft cylinder 11. Install. Further, a transparent cap 16 that covers the eraser 5 is fitted to the rear outer side 11 </ b> B of the shaft cylinder 11.
[0014]
The transparent cap 16 is made of a transparent polypropylene resin, and an ultraviolet absorber is dispersed in the resin.
[0015]
【The invention's effect】
The transparent cap for mechanical pencils of the present invention described above is carried by placing the mechanical pencil in a pocket or the like by dispersing the ultraviolet absorber in the transparent cap or by applying or baking the ultraviolet absorber on the transparent cap. Even if the transparent cap is exposed to ultraviolet rays on a daily basis, the eraser covered with the transparent cap is protected from the ultraviolet rays, and there is no possibility that the eraser will deteriorate and the erasability will be impaired.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part showing a second embodiment of the present invention.
[Explanation of symbols]
5 Eraser 6 Transparent cap 16 Transparent cap

Claims (2)

A transparent cap for a mechanical pencil, characterized in that an ultraviolet absorber is dispersed in a synthetic resin constituting the transparent cap in a transparent cap for covering an eraser mounted so as to protrude from the rear end of the mechanical pencil barrel . A transparent cap for a mechanical pencil, wherein a transparent cap for covering an eraser mounted so as to protrude from the rear end of a mechanical pencil barrel is provided by applying or baking an ultraviolet absorber to the transparent cap.

Images