JP2581802Y2 - Writing instrument cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument cap for preventing suffocation caused by accidental ingestion. More specifically, the present invention relates to a writing instrument cap in which an inner cap is provided in a main body cap and an air passage is provided between the outer wall of the inner cap and the inner wall of the main body cap.

[0002]

2. Description of the Related Art Conventionally, in this kind of cap, an air passage is formed between a main body cap and an inner cap.
Japanese Utility Model Application Laid-Open No. Hei 3-9879 or Japanese Utility Model Application Laid-open No. Hei 4-6918
No. 6, for example.

[0003]

In the conventional cap, since the air passages are open rearward in the axial direction at the inner cap opening end positions, when the pen point is inserted into the cap, the air passages are not closed. In some cases, the pen point was accidentally inserted or pierced into the opening or the gap between the inner cap outer wall and the main body cap inner wall, causing damage.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to ventilate even if swallowed by mistake. the gap between the inner wall is intended to provide a cap for a writing instrument is not damaging the pen tip insertion or piercing by.

[0005]

SUMMARY OF THE INVENTION The present invention is a writing implement cap in which an inner cap 2 is provided in a main body cap 1 and an air passage is provided between the outer wall of the inner cap 2 and the inner wall of the main body cap 1. The gist of the invention is that an inward projection 3 for guiding the pen tip to an axial position is provided on the inner wall of the main body cap 1 at a position behind the inner cap 2.

[0006]

When the pen tip is inserted off the axis of the inner cap 2, the pen tip is smoothly guided to the axis by the inward projection 3, and the opening of the ventilation path 4, the outer wall of the inner cap 2 and the body cap are inserted. The pen tip does not pierce the gap with the inner wall.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIGS. 1 to 3 show a first embodiment. The main body cap 1 is a cylindrical body having an inner hole penetrating in the axial direction, and an inner cap 2 made of a separate member is attached inside.

An annular inward projection 3 is formed on the inner wall of the main body cap 1.
Are provided integrally. The inward projection 3 includes a locking portion 32 at the front of which the opening edge of the inner cap 2 abuts, and a tapered surface 31 at the rear to guide the pen tip radially inward. The engaging portion 32 is provided with a communication hole 32 a communicating with the ventilation path 4, so that even if the opening edge of the inner cap 2 is in contact, the air is allowed to flow without being sealed. Further, since the communication hole 32a does not open rearward in the axial direction but opens in the radial direction, the pen point does not pierce the communication hole 32a.

The inner cap 2 is a cylindrical body having one end opened and the other closed, the outer diameter of which is smaller than the inner diameter of the main body cap 1, and having an airtight fitting surface on the inner wall. The airtightness is maintained with the writing instrument body. Further, since the inner cap 2 is formed as a separate member instead of being integrated with the main body cap 1, it is possible to consider a shape and a material that can maintain sufficient airtightness, thereby increasing the degree of freedom in manufacturing. In this embodiment, it is obtained by injection molding of a plastic material.

The inner cap 2 is provided with a fitting projection 21 on the outer periphery of the side wall, and the fitting projection 21 is configured to fit over the annular fitting projection 11 provided on the inner wall of the main body cap 1. Is done. Further, the fitting projections 21 of the inner cap 2 are chamfered 22 at three places to ensure ventilation at the fitting places.

That is, the inner cap 2 is brought into contact with the engaging portion 32 having the communication hole 32a provided in the main body cap 1 and fitted by the fitting protrusion 21 having the fitting protrusion 11 and the chamfer 22. At the same time as being mounted in the main body cap 1, a ventilation path 4 is formed between the outer wall of the inner cap 2 and the inner wall of the main body cap 1, communicating with the inside of the main body cap 1 in the axial direction from the tip to the rear.

FIGS. 4 and 5 show a second embodiment. An annular fitting protrusion 21 is provided on the outer peripheral wall of the inner cap 2,
On the other hand, a fitting projection 11 is provided on the inner peripheral wall of the main body cap 1, and the fitting projection 21 and the fitting projection 11 are fitted over each other. The fitting projection 11 of the main body cap 1 has three axial grooves 12 at three places.
The concave groove 12 extends from a tip of the inner wall of the main body cap 1 to a rearward position beyond the fitting portion. Thereby, ventilation is ensured at the fitting portion between the main body cap 1 and the inner cap 2. Other configurations are the same as those of the first embodiment.

FIGS. 6 and 7 show a third embodiment. The inner cap 2 is provided integrally with the main body cap 1. The inner cap 2 is connected to the inner wall of the main body by three ribs 13, whereby
A ventilation path 4 is formed between the inner wall and the outer wall of the inner cap 2.

A ring member 33 having a tapered surface 31 at the rear is fitted to the rear of the inner cap 2 in the main body cap 1 to form an inward projection 3.

A gap 5 is formed between the front end of the ring member 33 and the open end of the inner cap 2, and the gap 5 opens radially inward. The gap 5 allows the ventilation path 4 to communicate with the inside of the cap, and allows air to flow in the cap in the axial direction.

FIG. 8 shows a fourth embodiment. As in the first embodiment, the inner cap 2 has three ribs 13 inside the main body cap 1.
Thus, a ventilation path 4 is formed between the inner wall of the main body cap 1 and the outer wall of the inner cap 2.

At the open end of the main body cap 1, a cylindrical member 34 having a tapered surface 31 at the bottom is attached.
The cylindrical body 34 includes a small-diameter portion 34a having a fitting protrusion 34c on the outer periphery, and a large-diameter portion 34b having the same outer diameter as the main body cap 1. The inner wall of the large diameter portion 34b and the inner wall of the small diameter portion 34a are continuous by the tapered surface 31. The inner wall of the small diameter portion 34a is the inward projection 3. The cylindrical body 34 is attached by fitting over the fitting projections 34c on the outer periphery of the small diameter portion 34a with the fitting projections 11 on the inner wall of the opening of the main body cap 1.

[0019]

[Effect of the Invention] The present invention has the above-described structure,
Of course, even if swallowed accidentally, it can be ventilated,
There is no risk of the pen point being inserted or pierced into the opening portion of the air passage or the gap between the inner cap outer wall and the main body cap inner wall to cause damage.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a longitudinal sectional view of a third embodiment of the present invention.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a longitudinal sectional view of a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body cap 11 Fitting protrusion 12 Concave groove 13 Rib 2 Inner cap 21 Fitting protrusion 22 Bevel 3 Inward protrusion 31 Tapered surface 32 Locking part 32a Communication hole 33 Ring member 34 Cylindrical body 34a Small diameter part 34b Large diameter part 34c Fitting Projection 4 Ventilation path 5 Clearance

Claims (1)

(57) [Scope of request for utility model registration] 1. A writing instrument cap in which an inner cap is disposed within a main body cap and a ventilation path is provided between the outer wall of the inner cap and the inner wall of the main body cap, wherein a pen is provided on the inner wall of the main body cap 1 at a position behind the inner cap 2. A writing instrument cap provided with an inward projection 3 for guiding the tip to the axial position.