JP5339621B2 - Ballpoint pen tip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball-point pen chip that achieves a smooth writing feeling by a simple structure. <P>SOLUTION: The ball-point pen chip is configured as follows. The ball-point pen chip has an ink circulating hole and a radially-extending ink circulating groove in a chip body. A ball is placed by insertion on the bottom wall of a ball holding chamber and the chip front-end is inwardly caulked, thereby allowing the ball to partially protrude from the edge of the chip front-end so as to freely rotatably hold the ball. A plurality of recesses are formed at axially different positions on the outer wall of the chip body. The recesses are formed circumferentially and discontinuously. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention has an ink circulation hole and a radially extending ink circulation groove in the chip body, and a ball is inserted into the bottom wall of the ball holding chamber, and the tip of the chip is caulked inward. The present invention relates to a ballpoint pen tip in which a part of a ball protrudes from the tip end edge of the tip and is held rotatably.

  Conventionally, the chip body has an ink circulation hole and a radially extending ink circulation groove, the ball is inserted into the bottom wall of the ball holding chamber, and the tip end of the chip is caulked inward. A ball-point pen tip is well known in which a part of the tip is protruded from the tip end edge of the tip and is rotatably held.

  Also, a ball-point pen tip having a ball-point pen tip body made of resin, such as Japanese Patent Publication No. 63-23919 “Ball-point pen tip” and Japanese Patent Laid-Open No. 10-297159 “Ball-point pen chip manufacturing method and ball caulking tool”, is also good Are known. Such a resin ball-point pen tip is considered to be able to obtain a smooth writing feeling although it is inferior in wear resistance to a metal ball-point pen tip.

Japanese Patent Publication No. 63-23919 JP-A-10-297159

  By the way, as a result of diligent research on the smooth writing feeling in the resin ball pen tip, as in Patent Documents 1 and 2, the inventor made the resin ball pen tip at the time of contact resistance between the paper surface and the ball at the time of writing. It is considered that the vibration of the chip is absorbed by the chip body as a factor in improving the writing feeling.

  An object of the present invention is to provide a ballpoint pen tip that can obtain a smooth writing feeling with a simple structure.

  In order to achieve the above object, the present invention has an ink circulation hole and a radially extending ink circulation groove in a chip body, and a ball is inserted into the bottom wall of the ball holding chamber, and the tip end of the chip In a ballpoint pen tip that is rotatably held by protruding a part of the ball from the tip edge of the tip, a plurality of recesses are provided at different positions in the axial direction of the outer wall of the tip body. And the recess is formed discontinuously in the circumferential direction.

  Further, the recesses adjacent in the axial direction are formed at different positions in the circumferential direction so that the other recess is located in a discontinuous portion of the one recess in the axial direction. .

  In addition, the chip body has an ink circulation hole and a radially extending ink circulation groove. The ball is inserted into the bottom wall of the ball holding chamber and the tip of the chip is caulked inward, thereby A ball-point pen tip that is partly protruded from the tip end edge and is rotatably held is characterized in that a spiral recess is formed on the outer wall of the tip body.

  Furthermore, the chip body is made of resin.

  According to the configuration of the present invention, since a plurality of recesses are formed at different positions in the axial direction of the outer wall of the chip body, the ball and the chip body and the paper surface and the ball at the time of writing The vibration at the time of contact resistance can be absorbed by the bending of the chip main body due to the depression, and a smooth writing feel can be obtained.

  Moreover, while the said recessed part forms discontinuously in the circumferential direction, while suppressing the fall of the intensity | strength of the ball-point pen tip by forming a recessed part, the recessed part is formed in the position which differs in an axial direction. Therefore, the vibration generated at the tip end of the chip is effectively absorbed over a wide range.

  Also, the recesses adjacent in the axial direction are formed at different positions in the circumferential direction so that the other recess is located in a discontinuous portion of the one recess in the axial direction. This produces an effect of easily absorbing vibration.

  Further, according to the configuration of the present invention, by forming the hollow portion in a spiral shape, the vibration of the tip end portion of the chip body due to the depression portion is deflected from the tip end portion side toward the tip rear end portion side. Vibration can be efficiently absorbed, and vibration can be absorbed in multiple directions.

  The ballpoint pen tip of the present invention is not particularly limited, and is made of metal such as stainless steel, aluminum, brass, or resin such as polyacetal resin, polyethylene terephthalate resin, polybutylene terephthalate resin, epoxy resin, polycarbonate resin, etc. Since the main body is made of resin, the natural vibration due to the material is low, and high vibration absorption can be expected.

  Moreover, the ball-point pen tip of the present invention can be easily removed by rotating the protective resin coating by attaching a protective resin coating for coating the ball so as to cover the recess.

  Furthermore, by providing an ink color display portion of the same color as the ballpoint pen ink in the recess, it is difficult to come into contact with the outside, such as when appearing, and the ink color display portion is less likely to peel off over time.

  The present invention has been able to provide a ballpoint pen tip that can obtain a smooth writing feeling with a simple structure.

FIG. 2 is a longitudinal sectional view of a principal part, partially omitted, showing the ball-point pen tip of Example 1. It is an external view in FIG. FIG. 6 is a main part external view of the ballpoint pen tip of Example 2 with a part omitted.

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

Example 1
A ballpoint pen tip 1 of Example 1 shown in FIGS. 1 and 2 has ink circulation holes 6 and radially extending ink circulation grooves 7 in a ball holding chamber 4 of a chip body 2 made of polyacetal resin. By placing the ball 9 on the bottom wall 5 of the holding chamber 4 and caulking the tip end edge 3a of the tip end portion 3 inward, a part of the ball 9 is rotatable so as to protrude from the tip end edge 3a. Hugging. A coil spring 10 is provided at the rear end of the ball 9 so as to always press the ball 9 against the inner wall of the tip end edge 3a.

  Further, the tip end portion 3 is formed in a substantially truncated cone shape that gradually decreases in diameter toward the tip end edge 3a. The tip end portion 3 extends in the circumferential direction on the outer wall of the tip end portion 3 and is noncircular. A plurality of depressions 8, specifically ten, are formed at different positions in the axial center J direction. Further, the recess 8 adjacent in the axial center J direction is formed so that the other recess 8 is located in the discontinuous portion 8a of the one recess 8 and intersects in the circumferential direction in the axial J direction. It is.

  At the time of writing, the ball 9 rotates in contact with a paper surface (not shown) through the ballpoint pen ink. At this time, vibration is generated by the rotational resistance between the ball 9 and the paper surface and between the ball 9 and the bottom wall 5, but the vibration generated by the bending of the tip end portion 3 by the recess portion 8 of the chip body 2 is absorbed. A writing feel can be obtained.

  Moreover, since the strength of the chip body 2 is suppressed by the non-continuous portion 8a of the recess 8 and vibration is absorbed in a wide range of the tip end portion, vibration can be efficiently absorbed. Further, by forming the recesses 8 and 8 ′ so as to intersect with each other in the circumferential direction, vibration absorption can be improved.

Example 2
The ballpoint pen tip 21 of Example 2 shown in FIG. 3 is similar to Example 1 except that a spiral recess 28 is formed on the outer wall of the tip end portion 23 of the tip body 22 made of polyacetal resin. 21 is gained.

  Further, the generated vibration is absorbed in a wide range of the tip end portion 23 due to the bending of the tip end portion 23 by the spiral recess portion 28 formed in the tip end portion 23, so that the vibration can be efficiently absorbed. it can.

  The shape, size, and formation position of the recess are not particularly limited, but the tip end of the chip is close to the ball in order to absorb vibrations caused by contact resistance between the ball and the chip body and the paper surface and the ball during writing. It is most preferable to form the film. A plurality of indentations may be formed in the circumferential direction.

  The ballpoint pen tip of the present invention is not limited to the type of ink and can be widely implemented as a ballpoint pen.

1, 21 Ball pen tip 2, 22 Tip body 3, 23 Tip tip 3a, 23a Tip tip edge 4 Ball holding chamber 5 Ink flow hole 6 Radial groove 7 Bottom wall 8, 28 Depressed part 8a Non-continuous part 9, 29 Ball

Claims (4)

The chip body has an ink circulation hole and a radially extending ink circulation groove, a ball is inserted into the bottom wall of the ball holding chamber, and the tip of the chip is caulked inward so that a part of the ball In the ball-point pen tip that protrudes from the tip edge of the tip and is rotatably held, a plurality of indentations are formed at different positions in the axial direction of the outer wall of the tip body, and the indentations are arranged in the circumferential direction. The ballpoint pen tip is formed discontinuously. The recesses adjacent in the axial direction are formed at different positions in the circumferential direction so that the other recess is located in a discontinuous portion of the one recess in the axial direction. 2. The ballpoint pen tip according to 1. The chip body has an ink circulation hole and a radially extending ink circulation groove, a ball is inserted into the bottom wall of the ball holding chamber, and the tip of the chip is caulked inward so that a part of the ball A ballpoint pen tip formed by projecting from a tip end edge of the tip and rotatably holding the tip, wherein a spiral recess is formed on the outer wall of the tip body. 4. The ballpoint pen tip according to claim 1, wherein the tip body is made of resin.

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