JPS6111015Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of writing instruments, especially those that use water-based ink, such as ballpoint pens and felt-tip pens, by making the tip barrel thinner and allowing the cap to be firmly fixed. Another object of the present invention is to provide a writing instrument whose writing end can be reliably sealed when a cap is fitted, and which can always maintain reliable sealing performance even when the reel is repeatedly inserted and removed.

Conventional writing instruments of this type have a structure in which a threaded portion is formed directly at the tip of the tip, or a caulking receiving portion is formed, and the cap is fixed by screwing or caulking onto the tip of the tip. However, in both cases, the wall thickness at the tip of the tip must be increased, and when forming the tip from a stainless steel pipe, it is difficult to make only the tip of the tip thick. It was rare.

In addition, as a seal structure between the tip shaft and the re-reel, a structure is adopted in which an elastic seal ring is interposed in the threaded part between the tip of the tip shaft and the mouthpiece, or a structure in which an elastic seal ring is fitted onto the inner circumferential surface of the tip shaft. However, in the former case, the thickness of the threaded part between the tip of the tip and the mouthpiece must be made thicker, and in the latter case, when inserting and removing the reel, the elastic seal ring deforms and falls off, causing the sealing effect to be lost. However, there were some shortcomings, such as smearing, and improvements were desired.

The present invention satisfies the above-mentioned requirements by having the structure described in the claims of the utility model registration.

The configuration of the illustrated example will be described below.

In the figure, a stopper ring 4 made of metal or synthetic resin is fitted onto the inner circumferential surface 3 of the tip 2 of the tip shaft 1 made of metal, and as shown in the figure, the inner circumferential surface 3 of the tip 2 of the tip shaft 1 is
The engagement of the tapered part with the taper of the outer circumferential surface of the cap retaining ring 4 prevents the forward movement, and also the collision between the distal end surface 15 of the tip 2 of the tip shaft 1 and the enlarged end 14 of the cap 7. It is fixed and prevented from moving backwards. Note that the cap retaining ring 4 may be fixed by applying an adhesive to the outer circumferential surface thereof.

The cap retaining ring 4 has a female thread 5, which is a locking portion, carved in the inner cavity on the front end side, and an inward flange 6 on the rear end side.

A cap 7 is fitted to the tip 2 of the tip shaft 1, and a cap retaining ring 4 is attached to the male thread 8, which is a locking portion on the outer periphery of the rear end.
It is screwed onto a female screw 5 and fixed in place. A liquid sealant may be applied to the threaded surfaces of the female and male screws. Note that instead of using the female screw 5 and the male screw 8, an undercut structure may be used for locking and fixing.

The rear end surface 9 of the cap 7 and the inward flange 6
An elastic seal ring 11 is interposed between the front end surface 10 and the elastic seal ring 11 and is supported with clamping pressure. The elastic seal ring 1 bulges toward the lumen due to this clamping pressure and support.
1 is brought into close contact with the outer circumferential surface 13 of a re-feel 12 that is housed from the tip shaft 1 to the mouthpiece 7.

Note that if the dimensions of each part are set appropriately, the rear end surface 9 of the cap 7 and the rear end surface 9 of the cap 7 do not need to be applied to the threaded surfaces of the female thread 5 of the cap retaining ring 4 and the male thread of the cap 7. An elastic seal ring 11 is clamped between the front end surface 10 of the inward flange 6 of the retaining ring 4,
Since it is supported, the space between the rear end surface 9 of the base 7 and the seal ring 11, and the seal ring 1
1 and the outer circumferential surface 13 of the refill 12, the space 22 is completely sealed.

By locking and fixing the cap stop ring 4 and the cap 7 as described above, the cap 7 is attached to the distal end 2 of the tip shaft 1 at the enlarged end 14.
It is brought into close contact with the front end surface 15 of.

The cap 16 that is externally fitted onto the tip shaft 1 has an inner tube 18 projecting from the top 17, and the inner circumferential surface of the inner tube 18 is in close contact with the outer circumferential surface of the enlarged end 14 of the base 7, forming an annular close contact part 19. is forming.

In the illustrated example, the enlarged end 14 of the cap 7 is formed into a projecting edge having a substantially triangular cross section, and the end edge of the inner cylinder 18 is formed into a projecting edge, so that the projecting edge and the projecting edge are brought into close contact with each other. 19, but the structure is not limited to such a structure. Note that the inner cylinder 18 is the cap 16.
It may also be made separate from the cap 16 and fixed to the ceiling of the cap 16 with screws or the like.

The present invention has the above structure, and the cap 7 is locked and fixed by the cap retaining ring 4 fixed to the inner peripheral surface of the tip 2 of the tip shaft 1, so that the wall thickness of the tip 2 of the tip shaft 1 can be reduced. There is no need to increase the thickness at all, and the entire tip shaft 1 can be made thin, and since the cap retaining ring can be formed with a sufficiently thick wall, it also has the effect of making the cap firmly fixed. play.

In addition, when the cap 16 is fitted, the spaces 21, 22, etc. of the writing end 20 are filled with the cap retaining ring 4.
A first seal point 23 is a close contact area between the elastic seal ring 11 and the outer circumferential surface 13 of the re-seal 12, which are supported by clamping pressure between the cap 7 and the cap 7; 2, and a third sealing point 2, which is an annular tight part 19 between the base 7 and the cap 16.
5, the writing edge 20 is completely sealed, and has the effect of preventing the writing edge 20 from drying out unexpectedly.

In addition, the elastic seal ring 11 is the cap stop ring 4.
It has a structure in which it is directly clamped and supported by the base 7 and the base 7,
It can be sufficiently bulged in the direction of the lumen, there is no need to increase the wall thickness of the other end shaft, and the clamping pressure support of the elastic seal ring 11 is reliable, so the re-feel 12 can be inserted and removed repeatedly. However, the elastic seal ring 11 is not displaced or deformed at all, and it is possible to maintain reliable sealing performance at all times.

[Brief explanation of the drawing]

The drawing is an enlarged vertical cross-sectional view of the main part of one example of implementation. 1... Tip shaft, 2... Tip, 3... Inner peripheral surface, 4...
...Cap retaining ring, 5...Female screw serving as a locking part, 6
... Inward flange, 7 ... Base, 8 ... Male thread serving as a locking part, 9 ... Rear end surface, 10 ... Front end surface, 1
1... Elastic seal ring, 12... Refill,
13... Outer peripheral surface, 16... Cap, 19... Annular close contact part.

Claims (1)

[Scope of utility model registration request] The cap retaining ring fixed to the inner peripheral surface of the tip of the tip has a locking part formed on the front end and an inward flange on the rear end, so that the cap fitted on the tip of the tip can be The end locking portion is locked and fixed to the locking portion of the cap stop ring, and an elastic seal ring is supported with pinch pressure between the rear end surface of the cap and the front end surface of the inward flange of the cap stop ring; The inner circumferential surface of the elastic seal ring is brought into close contact with the outer circumferential surface of the refill, and an annular close contact portion is formed between the outer circumferential surface of the mouthpiece and the cap externally fitted on the tip shaft. Characteristic writing instruments.