JPS6140549Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the tip of a writing instrument. In detail, the tip of a writing instrument that can be used for various pen bodies firmly in the neck cylinder without reducing ink flow performance and strength, and has a sealing function at the opening end of the barrel, making it easy to assemble and process. I will provide a.

The present invention will be explained below with reference to the drawings. The present invention consists of a short cylindrical part 4 hanging vertically from a disc-shaped part 3 having a pen body insertion hole 2 in the center thereof, and a plurality of inward protrusions 5 extending from the short cylindrical part at the ends thereof. Clamping piece 6 (usually 2~
Consisting of 3 pieces). This is the tip of a writing instrument that can be easily assembled from a holder/packing member 1 integrally molded of flexible plastic such as polyolefin resin, a pen body 8 having an annular groove 7 on its outer surface, and a neck tube 9. . More specifically, the pen body 8 is inserted into the holder/packing member 1 with the inward protrusion 5 of the member accommodated in the annular groove 7, and the clamping piece 6 is inserted into the inner wall 10 of the reduced diameter portion of the neck tube 9. This relates to the tip of a writing instrument that is assembled so that the pen body 8 is fixed by slight pressure and the disk-shaped portion 3 is brought into close contact with the open end 11 of the barrel.

As in the above configuration, the pen body is fixed by holding the inward protrusion 5 of the clamping piece 6 into the annular groove 7 of the pen body, and by slightly touching the peripheral surface of the clamping piece 6 with the inner wall 10 of the reduced diameter part of the neck tube. The pen body is fixed by pressing to prevent the holding piece 6 from expanding. In this way, it is possible to completely eliminate the retraction of the pen body due to writing pressure, and there is no inhibition of ink outflow due to compression of the capillary gap due to strong pressure on the side of the pen body, so it is effective for fixing soft or low-strength pen bodies. Writing implements with various writing performances can be easily provided. Further, the holder/packing member 1 of the present invention has a structure that can be mass-produced very easily in one piece by injection molding or the like.
That is, the clamping piece 6 does not protrude directly from the disk-shaped part 3, but extends through the short cylindrical part 4 in the middle, so that it is easy to form the clamping piece inside the mold. The resin flow and its supply are made smooth, and the clamping piece 6 having the inward protrusions 5 in the desired shape and arrangement according to the purpose at the end can be stably molded without any trouble.

Although not disclosed in the drawings of the embodiment, the lower surface of the disc-shaped portion 3 of the holder-packing member 1 is provided with a short cylindrical projection or a protruding piece for guiding insertion into the shaft cylinder opening end 11. The neck tube 9 of the member 1 can be extended as necessary, or an appropriate number of minute protrusions may be provided at appropriate intervals on the outer peripheral edge of the disc-shaped portion 3.
It is also possible to add a structure that facilitates locking to the inner wall of the neck cylinder during insertion into the cylinder.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of the writing instrument of the present invention, FIG. 2 is a perspective view of the pen body, and FIG. 3 is an enlarged perspective view of a holder-cum-packing member. 1...Holder and packing member, 2...Pen body insertion hole, 3...Disc shaped part, 4...Short cylinder part, 5...
Inward projection, 6... holding piece, 7... annular groove, 8...
... Pen body, 9 ... Neck tube, 10 ... Inner wall of reduced diameter part,
11... Opening end of the shaft cylinder.

Claims (1)

[Scope of utility model registration request] A disc-shaped part 3 with a pen body insertion hole 2 penetrating through the center part.
A plastic holder/packing member 1 consisting of a short cylindrical portion 4 vertically disposed vertically at the bottom of the tube and a plurality of clamping pieces 6 extending from the short cylindrical portion and having inward protrusions 5 at the ends is provided with an annular groove 7 on the outer surface. The provided pen body 8 is inserted into the concave groove with the inward protrusion 5 accommodated, and the gripping piece 6 is pressed by the inner wall 10 of the reduced diameter part of the neck tube 9, and the pen body 8 is inserted.
is fixed, and the disc-shaped portion 3 is brought into close contact with the open end portion 11 of the barrel.