JPS622153Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a writing instrument cap having an inner tube fixed therein.

In relatively high-grade writing instruments such as fountain pens, in order to prevent ink from evaporating, an inner cylinder is often fixed inside the cap body and the pen body is sealed with this inner cylinder. In order to attach and lock the cap to the writing instrument body, an annular locking pawl that protrudes inward is provided on the inner cylinder, and this locking pawl passes over the annular protrusion at the tip of the tip of the writing instrument and locks the cap. In many cases, the cap is locked when the cap is fitted, but at this time, if the opening edge of the cap body hits the stepped part of the writing instrument body, there will be no gap between the cap and the writing instrument body. The momentum of the locking pawl overcoming the annular protrusion at the tip causes the edge of the tip opening to strongly strike against the stepped portion, producing a striking sound at that time, which has the advantage of improving the feeling when the cap is attached.

Incidentally, in the past, many of the structures of this type of cap were as shown in FIG. That is, the tail plug 12 having a threaded portion 12a is fitted into the cap body 11 and secured with a nut 19, and the rear end of the inner cylinder 13 is screwed onto the threaded portion 12a. Therefore, the number of parts is large and it takes time to assemble, and the cap body 1
It was also necessary to process the tail end opening of No. 1 into a small diameter. Furthermore, in this type of cap, the distance between the tip opening edge 11a of the cap body 11 and the locking claw 13a of the inner cylinder 13 is important, but it is difficult to screw the inner cylinder 13 and stop it at an accurate position during assembly. It is quite difficult,
Furthermore, during use, the screws loosen and the distance described above changes, causing a gap between the cap and the writing instrument and the problem of no impact noise.

Therefore, the present invention has a small number of parts, is easy to assemble, the position of the inner cylinder is accurately determined and does not change during use, and the impact noise is reliably generated when attached to the writing instrument body. The purpose is to provide a cap for a writing instrument, and its structure is such that the opening edge of the tip of the cap body abuts against the step of the writing instrument body, and the locking claw of the inner cylinder fixed inside touches the annular protrusion of the writing instrument. For the caps to be engaged, press-fit the tail plug into the opening at the rear end of the cap body, and insert the fixing hole at the rear end of the inner cylinder into the protrusion at the front of the tail plug to engage the opening edge at the front end of the cap body and the inner cylinder. It is characterized by being inserted and crimped and fixed until the distance from the claw reaches a predetermined value.

The present invention will be specifically described below based on embodiments shown in the drawings.

The cap body 1 is pipe-shaped, and the tail plug opening is only provided with a notch into which a clip 4 is inserted. The tail plug 2 has a press-fitted part 2a that is somewhat larger than the inner diameter of the cap body 1, and a protrusion 2 in front of the press-fitted part 2a.
A press-fitting portion 2a is press-fitted into the tail end opening of the cap body 1 and firmly fixed thereto. An annular locking pawl 3a is provided on the front inner surface of the inner cylinder 3.
is provided, and the inner diameter is provided with a projection 2b at the rear end.
A fixing hole 3b is provided which is somewhat smaller than the outer diameter of the protrusion 2b, and the protrusion 2b is fitted into the fixing hole 3b and fixed by pressure. On the other hand, an annular protrusion 6 is provided at the front end of the tip 5 of the writing instrument body, and a stepped portion 8 is provided at the boundary between the tip 5 and the barrel 7. The claw 3a rides over the annular projection 6 and engages with it, but at the same time, the projection 2b is inserted into the fixing hole 3b by the amount so that the tip opening edge 1a of the cap body 1 hits the stepped portion 8. It is inserted into the correct position using a jig and firmly crimped and fixed.

In this way, in the present invention, the tail plug 2 is press-fitted into the tail end opening of the cap body 1, so the number of parts is small, the cap body 1 can remain in the shape of a pipe, and almost no machining is required. And the protrusion 2b of the tail plug 2
Since the tail plug 2 is fitted into the fixing hole 3b of the inner cylinder 3 and crimped, the assembly work becomes very easy. It can be easily and accurately inserted into the specified position using a suitable jig, and unlike threaded fitting, it will not loosen during use, so there will be no gaps between the cap and the writing instrument body, and there will be no impact noise. It is possible to solve problems such as no longer occurring.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view of an embodiment of the present invention. 1...Cap body, 1a...Tip opening edge, 2
...Tail plug, 2b...Protrusion, 3...Inner cylinder, 3a...
Locking claw, 3b... Fixing hole, 6... Annular projection, 8...
...Danbe.

Claims (1)

[Scope of utility model registration request] In a cap in which the tip opening edge of the cap body abuts against the stepped portion of the writing instrument body, and the locking claw of the inner cylinder fixed inside engages with the annular protrusion of the writing instrument,
Press-fit the tail plug into the opening at the rear end of the cap body, and insert the fixing hole at the rear end of the inner cylinder into the protrusion in front of the tail plug so that the distance between the edge of the opening at the front end of the cap body and the locking pawl on the inner cylinder is set to a specified value. Insert it until it reaches the desired value and secure it by crimping.
A cap for a writing instrument that is characterized by producing an impact sound when attached to the writing instrument body.