JPH0453973Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a writing instrument in which an adapter is fitted to the tip of the refiel in order to suppress rattling of the refiel at the tip opening of the outer shaft.

[Conventional technology]

In order to suppress the wobbling of the re-feel at the tip of the outer shaft, a method is generally adopted in which the outer surface near the writing section of the re-feel is brought into pressure contact with the inner surface near the tip of the outer shaft. When the specifications of one of the outer shafts is changed, the design of the other shaft must be changed, which is extremely troublesome. Therefore, we have developed a structure in which an adapter is fitted onto a re-feel and the adapter and the outer shaft are brought into pressure contact.If the specifications of one of the re-feels or the outer shaft are changed, the dimensions of the adapter can be changed to ensure that the adapter and the outer shaft are in pressure contact with each other. Writing instruments that do not require design changes are emerging. By the way, the tip of a typical re-feel has an air hole, and if an adapter is fitted to the tip of the re-feel, there is a risk that the air hole will be blocked.To prevent this, conventional adapters have an air hole. Air grooves were provided along the inner surface.

[Problem that the invention attempts to solve]

When fitting an adapter to a re-feel and fixing the adapter by pressing it against the inner surface of the outer shaft, if the pressure is large, the air groove of the adapter may be compressed and blocked, but with conventional adapters, Since the air groove is provided on the inner surface, it is extremely difficult to visually confirm that the air groove is closed, especially when the tip opening of the outer shaft has a small diameter.
The purpose of the present invention is to solve such problems.

[Means for solving problems]

The present invention includes a re-feel that has an air hole at its tip, and a re-feel that is fitted onto the outer periphery of the tip of the re-feel and has a cavity around the air hole inside the re-feel, and from the cavity to the outer surface. The adapter has a radial through hole that opens and further has an axial air groove that opens from the through hole to the tip edge on the outer surface, and the inner surface near the tip opening presses against the outer surface of the adapter to write the tip of the reel. The above-mentioned problems can be solved by configuring a writing instrument comprising an outer shaft that allows the tip edge of the adapter to protrude outside from the tip opening.

〔Example〕

The illustrated embodiment of the present invention includes a refill 5 for a ballpoint pen in which an air hole 4 is formed in a stepped portion 3 at the boundary between a small diameter portion 1 and a medium diameter portion 2 of the tip portion, and a small inner diameter is formed in the inner hole portion in order from the front end. It has a portion 6 and a large inner diameter portion 7, and has circumferential crimping ribs 8, 8' protruding from the inner surface of each, and a tapered outer surface portion 9 which tapers in order from the tip on the outer surface.
The parallel outer surface 10 has a circumferential crimp rib 8'' projecting therefrom, and a tapered outer surface 9 extends from the front end of the large inner diameter section 7 in the inner hole to the outer surface. The reel 5 has a radial through hole 11 that opens to the rear end, and an axial air groove 12 that opens from the through hole 11 to the tip edge along the tapered outer surface 9. The crimping rib 8 of the small inner diameter part 6 is brought into pressure contact with the outer surface of the small diameter part 1 on the outer circumference from the slightly rearward position of the part 13 to the approximate rear end position of the medium diameter part 2, and the crimping rib 8 of the large inner diameter part 7 is pressed against the outer surface of the small diameter part 1. ' is in pressure contact with the outer surface of the medium diameter part 2, and the step part 3 of the re-feel 5 and the inner step part 14 at the front end of the large inner diameter part 7 are slightly separated from each other, so that a gap part 15 is formed in front of the air hole 4. The adapter 16 to be attached, the tapered inner surface 18 near the tip opening 17 and the parallel inner surface 19 behind it are crimped ribs on the tapered outer surface 9 near the tip edge of the adapter 16 and the parallel outer surface 10 behind it, respectively. 8'' to make the tip writing part 13 of the refeel 5 and the tip edge of the adapter 16 protrude somewhat from the tip opening 17.
It is made up of the following.

[Action and effect]

The present invention is as described above, and since it has a structure in which the adapter is fitted onto the refiel and the adapter is pressed against the outer shaft to fix the refiel without wobbling, even if there is a change in the specifications of either the refiel or the outer shaft. This is extremely advantageous because it can be handled by changing the dimensions of the adapter without changing the design of the other side, and it is also extremely advantageous to provide a groove on the outer surface of the adapter that communicates with the air hole of the reel. The structure allows the part to protrude somewhat from the tip of the outer shaft, so if the groove of the adapter is compressed and the air flow path is blocked when the adapter and the outer shaft come into pressure contact, this condition can be easily confirmed visually. Therefore, it has the effect of preventing defective products from being overlooked.

[Brief explanation of the drawing]

The figure is a longitudinal cross-sectional view of a main part showing an embodiment of the present invention. 1... Small diameter part, 2... Medium diameter part, 3... Step part, 4
...Air hole, 5...Refeel, 6...Small inner diameter part, 7...Large inner diameter part, 8, 8', 8''...Rib for crimping, 9...Tapered outer surface part, 10...Parallel outer surface part ,
DESCRIPTION OF SYMBOLS 11...Through hole, 12...Air groove, 13...Writing part, 14...Inner surface stepped part, 15...Gap part, 16...
...Adapter, 17...Tip opening, 18...Tapered inner surface, 19...Parallel inner surface, 20...Outer shaft.

Claims (1)

[Scope of utility model registration request] A re-feel with an air hole at its tip, and a re-feel that is fitted onto the outer periphery of the tip of the re-feel and has a gap around the air hole inside the re-feel, and a radius that opens from the gap to the outer surface. The adapter has a through hole in the axial direction and further has an axial air groove on the outer surface that opens from the through hole to the tip edge, and the inner surface near the tip opening is in pressure contact with the outer surface of the adapter to form a writing part at the tip of the refeel and the adapter. A writing instrument comprising an outer shaft whose tip edge projects outward from the tip opening.