JPS5845102Y2 - Knotsuku style pencil - Google Patents

Description

[Detailed description of the invention] This invention relates to a knock-type mechanical pencil whose inner periphery is fixed to a metal ring fixed to a metal body.

As shown in FIG. 1, a conventional knock-type mechanical pencil has an inner periphery 2 directly bonded to a metal body.

Therefore, various inner circumferences 2 had to be manufactured to match the inner surface 1A of the shell 1.

Moreover, the outer diameter of the inner periphery 2 must be determined in accordance with the curved surface part or the inner surface 1A of the tapered part of the body 1.
As shown in the figure, if the inner diameter of the shell 1 is small or the outer diameter of the inner circumference 2 is large, the inner circumference 2 cannot be inserted into the shell 1 to the specified position. Since the threaded portion 3A of the inserted connector 3 does not protrude beyond the tip of the barrel 1, there have been disadvantages such as the cap 4 not being able to be screwed together and the amount of lead to be drawn out becoming longer.

On the other hand, if the inner diameter of the shell 1 is large or the outer diameter of the inner periphery 2 is small as shown in Fig. 3, there will be a gap between the shell 1 and the inner periphery 2, resulting in insufficient adhesion and the connecting tool 3. When the cap 4 and the barrel 1 were reversed in order to screw the cap 4 together, the bond between the barrel 1 and the inner periphery 2 was peeled off and the barrel rotated.

This idea is structured so that the large diameter part of the inner circumference is fixed to the inner diameter hole of the metal ring fixed to the body, and by unifying the inner diameter hole dimensions of the metal ring, the inner circumference is not affected by the shape of the body. Moreover, it is an object of the present invention to provide a knock-type mechanical pencil that can be used in common, and furthermore, the inner periphery can be attached easily and reliably for positioning.

The structure of this invention will be explained based on FIG. 4. A metal ring 5 is fixed to a metal body 11 by gluing or press-fitting, and a sheath 6 is screwed onto the metal ring 5.

And an external part 12A of the inner circumference 12 is attached to the inner thigh 11B of the trunk 11.
is locked and the inner periphery 12 is positioned, and the tip narrow diameter part 12B of the inner periphery 12 is inserted into the tip hole 11C of the barrel 11, and the cylindrical part of the inner periphery 12 is inserted into the cylindrical inner diameter hole 5A of the metal ring 5. The large diameter portion 12C is fixed by press fitting or adhesive.

A connector 13 is inserted into the inner periphery 12 with its rotation restricted, and the cap 14 cannot be screwed into the connector 13.

With this device configured as described above, there is no need to design or manufacture each internal periphery depending on the difference in the internal diameter of the cylinder, and because the internal periphery can be made common, costs such as design and parts management are eliminated. Moreover, since the gold ring and the inner periphery are composed of a cylindrical inner diameter hole and a large diameter part, there is little influence from variations in dimensions, and the body and the inner periphery are securely fixed.This is a manual knock type. It has a great effect compared to a mechanical pencil.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the main parts of a conventional knock-type mechanical pencil, Figures 2 and 3 are longitudinal cross-sectional views of the main parts of the conventional knock-type mechanical pencil, showing how the barrel and inner periphery are attached. The figure is a longitudinal cross-sectional view of the main parts of the knock-type mechanical pencil of this invention. 1.11...Body, 1A...Inner surface of shell 1, 11 B...Internal arrangement of shell 11, 11C...
. . . tip hole of body 11, 2, 12 . . . inner periphery,
12A... Outer thigh of inner circumference 12, 12B...
...Thin diameter part at the tip of the inner circumference 12, 12C...Large diameter part of the inner circumference 12, 3゜13...Connection tool, 3A...
...Threaded part of connector 3, 4゜14 ... Countryside, 5 ... Gold ring, 5A ... Inner diameter hole of gold ring 5, 6 ... ·sheath.

Claims (1)

[Scope of utility model registration request] In a knock type mechanical pencil in which the lead is gradually drawn out by a knock and a metal ring is fixed to a metal body, the tip narrow diameter portion 12B of the inner periphery 12 is inserted into the tip hole 11C of the body 11, and the cylindrical shape of the metal ring 5 is inserted. A knock-type mechanical pencil characterized in that a cylindrical large diameter portion 12C of an inner periphery 12 is fixed to an inner diameter hole 5A.