JP3587597B2 - Knock cover of mechanical pencil - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a mechanical pencil knock cover.
[0002]
[Prior art]
The knock cover of a general mechanical pencil is designed so that its head is pressed with a finger in order to draw out a writing lead. In addition, the knock cover is detachably attached to the opening end of the core pipe that accommodates the replacement core, and also serves as a lid that opens and closes the opening of the core pipe. When the knock cover was removed from the core pipe, it could be swallowed accidentally, and there was a risk of choking in the throat. Therefore, as a safety measure, a method of providing a vent hole in the head of the knock cover was considered, but there was a problem that when the mechanical pencil was turned upside down, the extra core in the core pipe fell through the vent hole. occured.
[0003]
[Problems to be solved by the invention]
Thus, the present invention can prevent suffocation even if swallowed by mistake when removed from the core pipe, and prevent the extra core from falling off inside the core pipe even if it is turned upside down while fitted on the core pipe. The purpose is to provide a good knock cover.
[0004]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the knock cover of the mechanical pencil according to the present invention is provided with a bridge portion 3 crossing the top end opening of the outer cylinder portion 2 so that a plurality of ventilation holes are provided between the outer cylinder portion 2 and the bridge portion 3. 4 and a central core portion 5 which is inserted into the core pipe 6 and closes the opening of the concentric pipe 6 at the center of the lower surface side of the bridge portion 3 so as to protrude therefrom. is there.
[0005]
[Action]
When detached from the core pipe 6, the ventilation hole 4 provided between the outer cylinder 2 and the bridge 3 ensures air circulation between the upper and lower ends, so that suffocation can be prevented even if swallowed accidentally. it can.
Further, in the state of being fitted to the core pipe 6, the core 5 is inserted into the core pipe 6 and closes the opening of the concentric pipe 6, so that the extra core does not drop even if it is turned upside down.
[0006]
【Example】
Hereinafter, illustrated embodiments of the present invention will be described. First, FIGS. 1 to 3 show a first embodiment. The knock cover 1 is made of plastic, and has an outer tubular portion 2, a bridge portion 3, and a core portion 5. As shown in FIG. 2, the outer cylinder portion 2 has an inner diameter slightly larger than the outer diameter of the shaft main body 7 of the mechanical pencil. As shown in FIG. Is installed so as to cross the top end opening. The bridge 3 divides the top end opening of the outer cylinder 2, and two vent holes 4 are opened between the bridge 3 and the outer cylinder 2. As shown in FIG. 1, when the knock cover 1 is removed, the ventilation hole 4 ensures air circulation between the upper and lower ends, so that suffocation is prevented even if swallowed and clogged in the throat. . Further, as shown in FIG. 2, when the knock cover 1 is fitted to the shaft main body 7, the core portion 5 is inserted into the core pipe 6 to close the opening of the core pipe 6. Even if it is turned upside down, the extra lead 8 housed in the core pipe 6 does not fall off.
[0007]
In the first embodiment, the bridge 3 crossing the top end opening of the outer cylinder 2 has a single shape, but the shape of this bridge is free. For example, as shown in the knock cover 9 of the second embodiment shown in FIG. 4, the shape of the bridge portion 10 is formed in a cross shape to make four ventilation holes 11, or the knock cover of the third embodiment shown in FIG. As shown in FIG. 12, the bridge portion 13 may be formed in a Y-shape and the number of the ventilation holes 14 may be reduced to three.
[0008]
【The invention's effect】
The knock cover of the mechanical pencil of the present invention is as described above. This also has the effect of preventing the replacement core from falling off the core pipe.
Further, the knock cover of the present invention has an advantage that molding with a mold is easy, and further, since it has an outer cylindrical portion and has a relatively large outer diameter, there is an advantage that knock operation is easy.
[Brief description of the drawings]
FIG. 1 is a perspective view of a first embodiment.
FIG. 2 is a longitudinal sectional view showing a state where the knock cover of the first embodiment is fitted to a core pipe.
FIG. 3 is a transverse sectional view taken along line AA of FIG. 2;
FIG. 4 is a perspective view of a second embodiment.
FIG. 5 is a perspective view of a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Knock cover 2 Outer cylinder part 3 Bridge part 4 Vent hole 5 Middle core part 6 Core pipe 7 Shaft main body 8 Extra core 9 Knock cover 10 Bridge part 11 Vent hole 12 Knock cover 13 Bridge part 14 Vent hole

Claims (1)

By providing a bridge portion 3 crossing the top end opening of the outer cylinder portion 2, a plurality of ventilation holes 4 are provided between the outer cylinder portion 2 and the bridge portion 3, and a core pipe 6 A knock cover of a mechanical pencil characterized in that a central core portion 5 that is inserted into the inside of the inside and closes the opening of the concentric pipe 6 protrudes.

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