JP2516858Y2 - Writing instrument cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a writing instrument cap such as a felt-tip pen or a ballpoint pen.

(Prior Art) Conventionally, writing instrument caps such as felt-tip pens and ball-point pens can be roughly classified into those with clips and those without clips. There are thick and thin ones.

Now, when a child or an infant uses a writing instrument, there is a risk that the cap is accidentally put in the mouth and swallowed. At this time, the one with the clip is likely to have an air flow passage when accidentally swallowed, but the one without the clip is dangerous because no air flow passage can be formed at all. In particular, those that are thin and have no clips are the most dangerous.

In order to improve these drawbacks, (a) JP-A-1-15
7898, (b) Actual Kaihei 1-169384, (c) 1-1693
No. 85, (d) 1-169386, (e) British Patent No. 2
No. 174374 is known.

In (a), since the air flow passage is provided on the outer surface of the cap, the outer diameter of the cap increases.

(B) has two members, an inner cap and a cap.

In (c), since the groove is provided on the outer circumference of the inner cap, when the cap is made thin, the groove becomes small and air circulation may be insufficient.

In (d), the thickness of the cap becomes thicker, and (e) is closer to the opening end of the cap.
I accidentally insert the pen tip into the hole and break the pen tip.

Further, the above-mentioned prior art is a device for providing an air flow passage, but it has not been considered at all to protect the pen tip by inserting the pen tip into the hole of the air flow passage.

(Problems to be Solved by the Invention) As described above, the conventional improvement object is not sufficient as a thin cap without a clip.

In other words, the shape of a conventional cap is maintained, an air flow passage is surely provided even if it is swallowed, and the mold can be made inexpensive even in the case of molding a die, and the pen tip can be easily made inexpensive. It provides a cap that can be attached and removed without being scratched.

(Means for Solving the Problem) A groove 7 is provided on the inner peripheral surface of the cap 1 in the same direction as the axial direction from the cylindrical cap top portion 5 to the middle portion, and an annular projection 9 is provided near the opening 6 side. A writing instrument cap, wherein an inner cap 11 is fitted and holes 10 are provided at both ends of the groove 7.

(Operation) Since the groove 7 and the annular projection 9 are provided on the inner peripheral surface of the cap 1 from the top portion 5 to the middle portion of the cap 1, the inner cap 11 is fitted into the cap 1 and the hole 10 is provided. Since the and are communicated with each other, even if it is swallowed accidentally, sufficient air can flow, and since the pen tip 3 is not accidentally inserted into the hole 10 by the annular projection 9 when the cap is attached, the pen tip 3 is not scratched.

(Example) Next, an example is described in detail.

 An embodiment will be described with reference to FIGS. 1 and 2.

1 is a cap. The opening 6 has a diameter of 14 mm, and the opening 6 to the top 5 has a cylindrical shape of which both ends have substantially the same diameter, and the inner peripheral surface of the groove 5 has a depth of 0.5 mm and a width of 1 or 2 mm. Are equally divided, and an annular projection 9 is provided on the inner peripheral surface of the groove 7 in the vicinity of the opening 6 side. When the inner cap 11 having the convex portion 12 on the outer peripheral surface is fitted to the cap 1, a hole 10 is formed at the top 5 of the cap 1 and the open end of the inner cap 11. The cap 1 and the inner cap 11 are made of synthetic resin such as polyethylene, polypropylene, polyacetal, urea and polybutyl terephthalate.

The shape of the groove 7 may be any shape that can be formed, such as a semicircle, an ellipse, and a V groove, and the number thereof can be appropriately determined.

An annular projection 9 is provided near the end of the groove 7 of the cap 1 on the opening 6 side so that the pen tip 3 is not accidentally inserted into the hole 10 when the cap 1 is attached to the writing instrument main body 2. The height of the annular protrusion 9 may be about 1 mm, but is not necessarily limited to this, and may be any height as long as it is difficult for the pen tip to be inserted.

A tip holder 4 holding a pen tip 3 is fitted on the writing instrument body 2. Pen tip 3 when attaching the cap
Even if is in contact with the inner wall surface of the cap up to the vicinity of the hole 10, the annular protrusion 9
Therefore, the pen tip 3 does not contact the hole 10.

 With the above configuration, there are the following effects.

(1) Since the groove is provided from the top of the cap to the middle part and communicates with the hole in the middle part, even if an infant or a child accidentally swallows and catches in the throat, air circulation can be performed, so it can be used with confidence.

(2) Compared to the outer diameter of the cap 1, the inner space volume of the pen tip portion of the cap does not need to be thicker than the outer diameter of the cap 1 in order to prevent or suppress ink evaporation. By doing so, the size can be made smaller, and the molding can be performed easily and inexpensively.

(3) Since the projection 9 is provided in the vicinity of the hole 10, the pen tip 3 can be prevented from being accidentally inserted into the hole 10 when the cap 1 is attached, and the pen tip can be prevented from being scratched.

[Brief description of drawings]

 Fig. 1 Partial sectional view of an embodiment of the present invention Fig. 2 Exploded partial sectional view of the present invention 1: Cap, 3: Nib 5: Top, 6: Opening 7: Groove, 9: Annular protrusion 10: Hole

Claims (1)

(57) [Scope of utility model registration request] 1. A groove 7 extending from a cylindrical cap top portion 5 to an intermediate portion.
Are provided on the inner peripheral surface of the cap 1 in the same direction as the axial direction, the annular projection 9 is provided near the opening 6 side, the inner cap 11 is fitted, and the holes 10 are provided at both ends of the groove 7. Writing instrument cap characterized by.