JP3200722B2 - Ballpoint pen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen. More specifically, the present invention relates to a ball pin in which a ballpoint pen tip in which a ballpoint pen tip is attached to an ink container via a chip holder is accommodated in a shaft cylinder, and the ballpoint pen tip projects from a tip end hole of the shaft cylinder.

[0002]

[Prior art]

Conventionally, as a means for fixing a ballpoint pen feel in a barrel of a ballpoint pen of this type, for example, a structure in which a flange portion of a chip holder is pressed against a tapered inner wall at the tip of the barrel has been proposed in Japanese Utility Model Publication No. No. 4,285,851.

[0004]

However, in the conventional structure, at least the tip of the ballpoint pen refill (the tip of the ballpoint pen or the tip of the tip holder) can be used even if the rear part of the tip holder is held by the tapered inner wall of the barrel. A small gap is formed between the inner wall of the shaft cylinder and the inner wall of the shaft cylinder tip hole. If this gap is large, even when the tip holder is held by the tapered inner wall,
The rattling occurs between the ballpoint pen tip and the barrel, resulting in poor writing feel. Also, with only the structure of holding by the tapered inner wall, reliable holding may not be performed due to dimensional variations in the axial direction. That is, the conventional structure cannot be said to be a reliable structure for holding the ballpoint pen refill on the barrel, and is insufficient for the rattling.

When the tip of the barrel having the tip hole is made of metal and the outer peripheral portion inserted through the tip hole of the ball-point pen refill is made of metal, when the ball-point pen refill is fitted and held by the tip hole, the fitting becomes impossible. Since the resultant force is increased to deteriorate the operation of replacing the ballpoint pen refill, the fitting and holding structure cannot be adopted. Therefore, conventionally, it was not possible to cope with the above-mentioned rattling prevention except by setting the gap as small as possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a ball-point pen which has no wobble between a ball-point pen feel and a barrel during writing and can provide a good writing feeling. It is.

[0007]

According to the present invention, a ball-point pen tip 6 accommodates a ball-point pen refill 4 attached to an ink container 5 via a chip holder 7 in a shaft cylinder 1, and a tip end hole of the shaft cylinder 1 is provided. 31 and the ballpoint pen tip 6
The tip holder 31 is made of a synthetic resin, and the tip hole 31 is made of a synthetic resin.
In a straight shape, and the front part of the chip holder 7 is pressed against the inner wall of the distal end hole 31.

It is also effective to provide a structure in which the tip holder 7 is provided with a ridge or a projection on the outer periphery of the front portion and is pressed against the inner wall of the tip hole 31.

[0009]

Since the inner wall of the distal end hole 31 of the barrel 1 is straight, it absorbs the dimensional variation of the ballpoint pen refill 4 in the axial direction. As a result, even if the above-mentioned variation occurs, the ball-point pen refill 4 is attached to the distal end hole 3 of the barrel 1.
1 is securely press-fitted and held, and rattling between the ballpoint pen refill 4 and the barrel 1 is reliably prevented.

Further, since the chip holder 7 is made of a synthetic resin, it can be easily deformed in the radial direction when it is press-fitted into the distal end hole 31. Regardless, the ballpoint pen refill 4 can be replaced smoothly.

[0011]

1 to 3 show a first embodiment of the present invention.

The shaft cylinder 1 is composed of an outer shaft 2 and a front port 3, and the front port 3 is screwed to a tip of the outer shaft 2. The outer shaft 2 is made of synthetic resin, and the tip 3 is made of metal. In addition, a straight front end hole 31 is formed through the front end 3.

The ballpoint pen refill 4 comprises a ballpoint pen tip 6, a tip holder 7, and an ink container 5.
In this configuration, a tip holder 7 made of a synthetic resin having a ball-point pen tip 6 press-fitted and fixed to the tip is attached to the tip of the ink container 5. A water-based ink is stored in the ink storage cylinder 5, and the back end is filled with a backflow prevention plug 51 made of a semi-fluid substance.

The ball-point pen tip 6 is a pipe-type ball-point pen tip 6 in which a metal pipe is pressed and deformed from the outside to form a plurality of inward projections, and the inward projections are used as ball receiving seats 61.

The tip holder 7 has a large diameter portion 71
The large-diameter portion 71 is fitted into the tip of the ink container 5 and the flange 72 abuts against the front edge of the ink container 5. Further, four projections 73 extending in the axial direction are provided on the outer periphery of the front part of the chip holder 7,
The diameter of the circumscribed circle of the ridge 73 is set to a size capable of being pressed against the inner wall of the straight front end hole 31 of the front end 3.

The flange 72 is provided with a concave groove 76, and the concave groove 76 and the ridge 73 form an air passage from the distal end hole 31 to the ink storage cylinder 5 when housed in the shaft cylinder 1. Is done.

The ballpoint pen refill 4 is inserted through a distal end opening of the outer shaft 2 having a tail plug 9 fitted to the rear end, and then the leading end 3 is screwed into the outer shaft 2 distal end. This allows
The rear end of the flange 72 of the chip holder 7 is in contact with the front end of the outer shaft 2, and the front end is pressed against the tapered step 32 of the inner wall of the front opening 3. Further, a ridge 73 provided in front of the chip holder 7 is pressed against the inner wall of the distal end hole 31, so that the ball-point refill 4 can be securely held without rattling with respect to the barrel 1.

A metal holding cylinder 8 is fitted around the tip holder 7 at the outer periphery thereof to further firmly fix the ball-point pen tip 6 to the tip holder 7. In addition, the outer periphery of the holding cylinder 8 keeps a slight gap with the inner wall of the distal end hole 31 and is in a non-contact state.

The rear end of the ballpoint pen refill 4 (ink storage cylinder 5) is held in the axial cylinder 1 in the axial direction by a projection 91 of a tail plug 9. The tip of the projection 91 is sharpened and is immersed in the rear end of the ink storage cylinder 5 or deforms itself to absorb variations in the axial direction of the ballpoint pen refill 4 and to reduce the ink due to a drop impact. Remove the housing cylinder 5 from the chip holder 7
Can be completely prevented.

FIGS. 4 and 5 show a second embodiment. Eight hemispherical projections 74 are arranged on the outer periphery of the front part of the chip holder 7, and the hemispherical projections 74 are pressed against the inner wall of the straight distal end hole 31. Since the hemispherical projection 74 has a smaller frictional resistance with the inner wall of the distal end hole 31 than the ridge 73 of the first embodiment, the press-fitting into the distal end hole 31 requires only a small force, and the attachment of the front end 3 is easy. It will be easier. Other configurations are the same as in the first embodiment.

FIG. 6 shows a third embodiment, in which an annular projection 75 is provided on the outer periphery of the front part of the chip holder 7 and the annular projection 75 is pressed against the inner wall of the straight end hole 31. .

FIG. 7 shows a fourth embodiment, in which the tip holder 7 is simply placed around the front outer periphery of the tip holder 7.
The front portion has a diameter slightly larger than the inner diameter of the distal end hole 31 and is press-fitted into the distal end hole 31. The operation and effect are the same as those in the previous embodiment.

In this embodiment, the front end 3 having the front end hole 31 is made of metal, but it may be made of synthetic resin.

[0024]

According to the ball-point pen of the present invention, the ball-point pen refill can be securely held in the barrel without rattling.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged longitudinal sectional view of a main part of the second embodiment.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is an enlarged vertical sectional view of a main part of a third embodiment.

FIG. 7 is an enlarged longitudinal sectional view of a main part of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Outer shaft 3 Front end 31 Tip hole 32 Taper step 4 Ballpoint pen refill 5 Ink storage cylinder 51 Backflow prevention plug 6 Ballpoint pen tip 61 Ball seat 7 Chip holder 71 Large diameter part 72 Flange part 73 Ridge 74 Hemisphere Projection 75 Annular projection 76 Depression groove 8 Holding cylinder 9 Tail plug 91 Projection

Claims (1)

(57) [Claims] 1. A ball-point pen refill (4) in which a ball-point pen tip (6) is attached to an ink container (5) via a chip holder (7) is accommodated in a shaft cylinder (1).
In a ball pin having the ballpoint pen tip (6) protruding from the tip hole (31) of the barrel (1), the tip holder (7) is made of synthetic resin and the tip hole (31) is straightened. A ball-point pen characterized in that a front portion of the tip holder (7) is pressed into contact with the inner wall of the tip hole (31).