JP2008055834A - Ball-point pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple structured ball-point pen with a bottomed barrel in which a receiving part on which a ball-point pent refill abuts does not deform to accommodate the ball-point pen refill in a prescribed position. <P>SOLUTION: In the ball-point pen, a ball-point pen chip rotatably holding a ball is fitted to the tip end part of an ink accommodation barrel directly or via a chip holder and a ball-point pen refill having an air hole communicating with the inside and outside is provided at the rear end, in the bottomed barrel. The receiving part wherein a plurality of projections cross with each other is formed in the rear end part of the barrel, allowing the ball-point pen refill to be arranged therein with its rear end surface abutting on the receiving part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides an air hole in which a ballpoint pen tip holding a ball rotatably is mounted directly or via a tip holder at the front end of an ink containing tube in a bottomed shaft tube, and the inside and outside communicate with the rear end. The present invention relates to a ballpoint pen provided with a ballpoint pen refill.

  Conventionally, a ballpoint pen tip that holds a ball rotatably is mounted directly or via a tip holder at the tip of the ink receiving tube in a bottomed shaft tube, and an air hole that communicates the inside and outside is provided at the rear end. Ballpoint pens having a ballpoint pen refill are well known.

Since such a ballpoint pen performs air replacement accompanying consumption of the ink for the ballpoint pen filled in the ink containing cylinder, Japanese Utility Model Laid-Open No. 64-4682 “Attachment structure of the core for ballpoint pen” and Japanese Patent Laid-Open No. 10-119477 “Writing instrument” Like the `` tail plugs '' etc., the rear end of the ink storage cylinder is in contact with the protrusions and stepped parts such as ribs that are formed inward in the shaft cylinder, and air flows to the rear end of the ink storage cylinder. What is gaining a way is disclosed.
“Japanese Utility Model Publication No. 64-4682 Publication” "Japanese Patent Laid-Open No. 10-119477"

  However, as in Patent Document 1, in the case where the rear end surface of the ink storage cylinder is held in contact with a receiving portion such as a rib formed inward in the shaft cylinder, the mechanical assembly is attached to the ink storage cylinder. If a strong force is applied to the rear side due to buckling, etc., the receiving part deforms due to buckling or the like, and the ballpoint pen refill cannot be disposed at a desired position, and as a result, a desired pen tip protrusion amount can be obtained. There was a problem that I could not. For this reason, the deformation of the receiving portion was prevented by forming the ribs with a large width or increasing the number of ribs, but this was not satisfactory.

  Further, as described in Patent Document 2, a step portion is provided at the rear end portion of the shaft tube, and the rear end portion of the ink containing tube is brought into contact with and held at the step portion, so that the above-described buckling does not occur. Therefore, it is preferable, but it is not suitable for a bottomed shaft cylinder that does not form an air hole in the rear end portion of the shaft cylinder. This is because in the case of a bottomed shaft cylinder, when the rear end of the ink containing cylinder is brought into contact with the stepped portion, the air flow to the rear end of the ink containing cylinder is closed. There was a problem that a communicating air hole was necessary.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a ballpoint pen consisting of a bottomed shaft cylinder with a simple structure that can accommodate a ballpoint pen refill at a predetermined position because a receiving portion with which the ballpoint refill is in contact does not deform.

  In order to achieve the above-mentioned object, the present invention provides a ball-point pen tip that rotatably holds a ball in a tip end portion of an ink containing cylinder in a bottomed shaft cylinder, directly or via a chip holder, and a rear end. A ballpoint pen refill having an air hole communicating inside and outside, wherein a receiving portion where a plurality of protrusions intersect is formed in a rear end portion of the shaft tube, and the receiving portion The rear end surface of the ballpoint pen refill is disposed in contact with the ballpoint refill.

  Further, the position where the plurality of protrusions intersect is formed at a position eccentric from the axis of the shaft cylinder.

  Further, a plurality of ribs for guiding the ballpoint pen refill are continuously provided in front of the receiving portion.

  Since the ballpoint pen of the present invention has a structure as described above, the receiving part with which the ballpoint pen refill abuts does not deform, so that a ballpoint pen consisting of a bottomed cylinder that can accommodate the ballpoint refill in a predetermined position has a simple structure. Could be provided.

  Embodiments of the present invention will be described with reference to the drawings. The same member and the same part are denoted by the same reference numerals.

  The ballpoint pen 1 according to the first embodiment shown in FIGS. 1 to 4 includes a tip end of an ink containing cylinder 9 in which writing instrument ink (not shown) is directly packed in a shaft cylinder body in which a front shaft 2 and a rear shaft 3 are connected. In addition, a writing instrument body provided with a ballpoint pen refill mounted with a ballpoint pen tip 11 holding a ball rotatably via a chip holder 10 and a transparent cap 4 by injection molding with polycarbonate resin (PC resin). The cap-type ballpoint pen 1 is obtained by detachably mounting by fitting over the fitting projection 2a formed on the outer wall of the front shaft 2 and the fitting protrusion 4a formed on the inner wall of the cap 4. .

  The cap 4 is integrally formed with a rolling prevention protrusion 5 and a head crown 6 is formed by two-color molding, and a seal member 7 for sealing the pen tip portion is provided inside the crown 6. A grip member 8 is attached to the grip portion of the front shaft 2.

  The rear shaft 3 is bottomed, and a substantially cross-shaped receiving portion 3b in which two protrusions intersect is formed at the rear end portion of the rear shaft 3, and the rear portion of the ink containing cylinder 9 is formed on the receiving portion 3b. The end surfaces are disposed in contact with each other. By making the rear shaft 3 into a bottomed shape, even if ink backflow occurs, ink does not leak from the rear end portion of the shaft cylinder. The receiving portion 3b is provided with four ribs 3a extending inwardly for guiding the rear end portion of the ink containing cylinder 9.

  The air change to the rear end portion of the ink containing cylinder 9 is performed by connecting the gap between the receiving portion 3b and the rib 3a from the rear end opening of the ink containing cylinder 9 by forming the receiving portion 3b. The air is communicated with the outside through an air flow path (not shown) formed in a connecting portion between the front shaft 2 and the rear shaft 3 through a gap between the ink storage cylinders 9. The position of the air flow path that communicates the inside and the outside is not limited to the connecting portion between the front shaft and the rear shaft, but an air hole is formed in the rear shaft or the front shaft, or a space between the front shaft and the ballpoint pen tip is used as appropriate. It can be selected and formed.

  By arranging the rear end surface of the ink containing cylinder 9 in contact with a substantially cross-shaped receiving portion 3b formed at the rear end portion of the rear shaft 3 where two protrusions intersect, the rear end of the rear shaft 3 is arranged. Even if a strong force is applied to the side, the receiving portion 3b is not buckled or deformed, so that the width L of the protrusion can be reduced and the number of the substantially cross shape and the protrusion can be reduced. Since the ballpoint pen refill can be disposed at a desired position, it is suitable for a machine assembly or the like.

  Further, by connecting four receiving ribs 3a extending inward to guide the rear end portion of the ink containing cylinder 9 to the receiving portion 3b, the rear end portion of the ballpoint pen refill is smoothly guided to the receiving portion. This is preferable.

  In the second embodiment shown in FIG. 5, a substantially cross-shaped receiving portion 13 b where two protrusions intersect is formed at the rear end portion of the bottomed rear shaft 13, and the position where the two protrusions intersect However, the position is deviated from the axis of the shaft cylinder.

  An air hole communicating with the inside and outside of the rear end portion of the ink containing cylinder 9, particularly like a tail plug (not shown), by making the intersection of the protrusions of the receiving portion 13 b eccentric from the axis of the shaft cylinder. When K has a small diameter, it is difficult to close the air hole by the receiving portion 13b, which is preferable.

  In the present embodiment, for the sake of convenience, it is a substantially cross-shaped receiving portion where two protrusions intersect, but if a receiving portion where a plurality of protrusions intersect is formed, the number is particularly limited to four or six. Is not to be done.

  The ballpoint pen of the present invention can be used without being limited to the type of ink and the shape of the pen tip. However, since a bottomed barrel is used, it is preferably used for a ballpoint pen that is directly packed with low-viscosity ink.

1 is a longitudinal sectional view showing a ballpoint pen of Example 1. FIG. It is a principal part expanded sectional view in which a part was omitted in FIG. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. FIG. 6 is an enlarged cross-sectional view of a main part, partially omitted, showing the ballpoint pen of Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Front axis | shaft 2a Fitting convex part 3, 13 Rear axis | shaft 3a, Rib 3b, 13b Receiving part 4 Cap 4a Fitting protrusion part 4b Movement prevention protrusion part 5 Anti-slip part 6 Rolling prevention protrusion part 7 Head crown 8 Seal member 9 Ink receiving cylinder 10 Chip holder 11 Ballpoint pen tip 12 Grip member

Claims (3)

A ballpoint pen refill that has a ballpoint pen tip that holds the ball rotatably, directly or via a tip holder, and has an air hole that communicates the inside and outside at the rear end of the bottomed shaft cylinder. The ballpoint pen is formed by forming a receiving portion where a plurality of protrusions intersect in the rear end portion of the shaft tube, and the rear end surface of the ballpoint pen refill is in contact with the receiving portion. Ballpoint pen characterized by being. 2. The ballpoint pen according to claim 1, wherein a position where the plurality of protrusions intersect is formed at a position decentered from an axis of the shaft cylinder. The ballpoint pen according to claim 1 or 2, wherein a plurality of ribs for guiding the ballpoint pen refill are continuously provided in front of the receiving portion.

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