JP2008006764A - Ball-point pen refill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball-point pen refill with simple structure, in which the smooth flowing of ink can be obtained. <P>SOLUTION: In the ball-point pen refill, which is formed by press-fittingly installing a ball-point pen tip with a rotatably held ball directly or through a tip holder at the tip part of an ink housing tube and by directly filling a water color ink for ball-point pens given by shear-thinning properties and a grease-like ink follower following up with the water color ink for ball-point pens in the ink housing tube, a plurality of longitudinal grooves extending from the rear end of the ball-point pen tip to its tip are formed at the rear end part of the ball-point pen tip and/or a plurality of longitudinal grooves extending from the rear end of the tip holder to its tip are formed at the rear end part of the tip holder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ball-point pen refill formed by press-fitting and mounting a ball-point pen tip having a ball rotatably held at the tip of an ink storage cylinder.

  A ballpoint pen refill is well known in which a ballpoint pen tip holding a ball rotatably is press-fitted to the tip of the ink storage cylinder and the ink for the ballpoint pen is stored in the ink storage cylinder.

  In such a ballpoint pen refill, the inventor of the present application disclosed a structure in which the inner diameter of the ink containing cylinder is gradually reduced toward the tip in Japanese Patent Application Laid-Open No. 2002-46388 “Ballpoint pen refill for multicolor or composite ballpoint pen”. Yes.

Further, as disclosed in Japanese Patent No. 3142207 “Chip Holder for Ballpoint Pen Refill”, a structure is disclosed in which a smooth ink outflow can be obtained by gradually reducing the diameter of the inner hole of the chip holder toward the tip.
"JP 2002-46388 A" “Patent No. 3142207”

  However, when ink with shear thinning is used, it fills with a grease-like ink follower that follows as the ink is consumed, but depending on the viscosity of the grease-like ink follower, Compared to this, the followability is poor, and in the structure in which the inner diameter of the ink containing cylinder is gradually reduced toward the tip as in Patent Document 1, the ink follower may cause a follow-up failure.

  Further, as in Patent Document 2, a smooth ink distribution can be obtained by increasing the area of the rear end opening of the chip holder, but a ballpoint refill that can provide a better ink distribution is desired.

  An object of this invention is to provide the ball-point pen refill with a simple structure which can obtain smooth ink distribution.

  The present invention relates to a water-based ballpoint pen in which a ballpoint pen tip holding a ball rotatably is press-fitted and attached to a tip portion of an ink containing cylinder directly or via a chip holder, and shear thinning viscosity is provided in the ink containing cylinder. In a ballpoint pen refill formed by directly packing ink and a grease-like ink follower that follows the water-based ballpoint pen ink, a longitudinal groove extending from the rear end to the front end of the ballpoint pen tip and / or Alternatively, a plurality of vertical grooves extending from the rear end of the chip holder toward the front end are formed at the rear end of the chip holder.

  Further, the groove width of the longitudinal groove decreases from the rear end to the front end of the ballpoint pen tip and / or the tip holder.

  The depth of the longitudinal groove may be reduced from the rear end to the front end of the ballpoint pen tip and / or the tip holder.

  Moreover, the cross-sectional shape of the said vertical groove is substantially arc shape, It is characterized by the above-mentioned.

  The present invention was able to provide a ballpoint pen refill with a simple structure capable of obtaining a smooth ink distribution.

  Next, examples of the ballpoint pen refill of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

  The ballpoint pen refill 1 of the present invention shown in FIGS. 1 to 4 is based on the water-based ballpoint pen ink 7 provided with shear thinning viscosity in the ink containing cylinder 2 and the rear end of the water-based ballpoint pen ink 7. The following grease-like ink follower 8 is directly packed, and the ball 5 is placed on the bottom wall of the ball holding chamber of the chip body at the tip of the ink containing cylinder 2, and the tip of the tip is caulked inward. Thus, the ballpoint pen tip 4 holding the ball 5 rotatably is press-fitted to the chip holder 3, and the press-fitting mounting portion 3 a of the chip holder is press-fitted to the tip of the ink storage cylinder 2, and the ink storage cylinder 2 The tail plug 6 is press fitted to the rear end portion to obtain the ballpoint pen refill 1 of the present invention.

  Two longitudinal grooves 3 b extending from the rear end of the chip holder 3 toward the front end are formed at the rear end of the press-fit mounting portion 3 a of the chip holder 3. The groove widths S and R of the vertical groove 3 b are gradually reduced toward the tip end direction of the chip holder 3. Similarly, the depths L and M of the vertical groove 3 b are gradually shallower toward the tip end direction of the chip holder 3.

  By the way, in ballpoint pens using water-based ballpoint pen inks, it is well known that ink is distributed by capillary action. The capillary action is generally an action in which ink flows from a thick part to a thin part.

  Therefore, by forming the vertical groove 3b extending from the rear end of the chip holder 3 toward the front end, the water-based ballpoint pen ink 7 is circulated from the ink containing cylinder 2 to the thin vertical groove 3b by capillary action, so that the smooth ink You can get a spill. Furthermore, since the opening area at the rear end of the chip holder is increased by forming the longitudinal groove, the ink circulation is improved.

  Furthermore, it is preferable that the groove widths S and R are gradually reduced toward the tip end direction of the chip holder 3 so that the ink flows smoothly in the tip end direction. Similarly, it is preferable that the depths L and M of the vertical grooves 3b are gradually made shallower toward the tip end direction of the chip holder 3 so that the ink flows smoothly in the tip end direction.

  In this embodiment, two vertical grooves are formed for convenience. However, as long as a plurality of grooves are formed, the shape and the number are not particularly limited. However, as in the other embodiments shown in FIG. By forming four substantially circular arc-shaped vertical grooves 13b having no corners in the cross section in the press-fitting mounting portion 13a of the holder, the ink flow becomes smoother and by a centrifuge (not shown). In the process of discharging air, it is most preferable because air is easily discharged without remaining in the corners. Similarly, it is preferable that the vertical groove has a continuous inclined shape or a circular arc shape in which the bottom surface of the vertical groove has no stepped portion even in the vertical cross section.

  Further, in this embodiment, for the sake of convenience, a vertical groove is formed at the rear end portion of the chip holder, but it may be formed at the rear end portion of the ball-point pen chip, or may be formed at both of the ball-point pen tips of the chip holder. . However, a resin-made chip holder is more preferable than a metal ball-point pen chip because a vertical groove is easily formed.

  Although it is conceivable to form a longitudinal groove at the tip of the ink storage cylinder, it is most preferable to form it at a position near the ball at the tip of the chip. Further, when using a transparent or translucent ink storage cylinder The vertical groove is visible from the outside, and as described above, when the grease-like ink follower remains in the vertical groove, the appearance visibility deteriorates, so that the ballpoint pen tip and / or the tip holder It is important to form it at the rear end.

  The shape and structure of the ballpoint pen tip of the present invention is not limited to the above embodiment, but when not in use, the ball held rotatably at the tip end of the tip is placed directly on the tip of the ball by a coil spring or via a pressing body. A valve mechanism may be provided that abuts the rear end, presses against the inner wall surface of the tip end edge of the chip, and causes the ink to flow out by providing a gap between the inner wall of the tip end edge of the tip and the ball by a pressing force during writing.

The ballpoint pen refill of the present invention can be used without being limited to the ink for the ballpoint pen to be used, and is widely used as a ballpoint pen such as a cap type ballpoint pen or a knock type ballpoint pen.

1 is a longitudinal sectional view showing a ball pen refill in Example 1. FIG. It is a principal part expanded sectional view in which a part was omitted in FIG. It is AA in FIG. It is BB in FIG. It is a figure which shows another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ball-point pen refill 2 Ink storage cylinder 3 Tip holder 3a, 13a Press-fit mounting part 3b, 13b Vertical groove 4 Ball-point pen tip 5 Ball 6 Tail plug 7 Water-based ball-point pen ink 8 Ink follower R, S Vertical groove width L, M Vertical groove Depth of

Claims (4)

A ballpoint pen tip that rotatably holds a ball is press-fitted and attached to the tip of the ink containing cylinder directly or through a chip holder, and the ink for the water-based ballpoint pen provided with shear thinning viscosity in the ink containing cylinder and the water-based ink In a ballpoint pen refill formed by directly filling a grease-like ink follower that follows the ink for a ballpoint pen, it extends from the rear end of the ballpoint pen tip to the rear end of the ballpoint pen tip, to the rear end of the ballpoint pen tip. A ballpoint pen refill characterized in that a plurality of vertical grooves extending from the rear end of the chip holder toward the front end are formed in the vertical groove and / or the rear end of the chip holder. 2. The ballpoint pen refill according to claim 1, wherein a groove width of the longitudinal groove decreases from a rear end to a front end of the ballpoint pen tip and / or the tip holder. 3. The ballpoint pen refill according to claim 1, wherein a depth of the longitudinal groove decreases from a rear end to a front end of the ballpoint pen tip and / or the tip holder. 4. The ballpoint pen refill according to claim 1, wherein a cross-sectional shape of the vertical groove is a substantially arc shape. 5.

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