JP5283276B2 - Writing instrument shaft - Google Patents

Description

  The present invention relates to a writing tool shaft cylinder in which a cushioning material made of a soft material is provided between an inner shaft and an outer shaft in a writing tool shaft such as a ballpoint pen or a mechanical pencil.

  Conventionally, a grip structure for a writing instrument is known in which the hardness of the lower grip cover is made smaller than that of the upper grip cover, and the lower grip cover and the shaft tube are simultaneously molded. (See Patent Document 1)

  However, the grip structure of the above-mentioned writing instrument has the advantage of preventing fatigue due to long-time writing by fitting the fingertip of the writer, but it is impossible for the outer grip cover to move in the longitudinal direction with respect to the inner grip cover Met.

JP 2004-66560 A

  The problem to be solved is that the outer grip cover cannot swing in the longitudinal direction with respect to the inner grip cover, and a soft writing feeling cannot be obtained during writing.

  The present invention includes an inner shaft of a writing instrument, a cushioning material provided on a grip portion of the inner shaft and made of a soft material, and an outer shaft made of a material harder than the cushioning material and placed on the outside of the cushioning material. The front and rear stages are formed on the inner surface of the outer shaft, the buffer material is brought into contact with the front stage and the rear stage of the outer shaft, and the buffer material is brought into contact with the inner surface of the outer shaft so that the outer shaft is elongated relative to the inner shaft. The first gist is that it is configured to be swingable in the direction and the radial direction.

  In addition, two concave grooves extending in the circumferential direction are formed on the inner shaft in the front and rear, ring-shaped cushioning materials are attached to the respective concave grooves, and the cushioning material is brought into contact with the front and rear stages of the outer shaft and the outer shaft. The second gist is that the cushioning material is brought into contact with the inner surface of.

  Further, two protrusions extending in the circumferential direction on the surface of the cushioning material are formed on the front and rear, and the protrusions are brought into contact with the front stage and the rear stage of the outer shaft and the inner surface of the outer shaft. And

  Furthermore, a plurality of front protrusions are formed at equal intervals in the circumferential direction on the front side of the surface of the cushioning material, and a plurality of rear protrusions are formed at equal intervals in the circumferential direction on the rear side of the surface. The fourth gist is that the rear projection is brought into contact with the rear stage and the inner surface of the outer shaft while being brought into contact with the front stage and the inner surface of the shaft.

  Furthermore, it has an inner shaft of the writing instrument, a cushioning material provided on the grip portion of the inner shaft and made of a soft material, and an outer shaft made of a material harder than the cushioning material and placed on the outer side of the cushioning material. The inner shaft is formed on the inner surface of the outer shaft, the front projection and the rear projection are formed on the cushioning material, the front projection of the cushioning material is brought into contact with the inner shaft front end and the inner surface of the outer shaft, and the outer shaft A fifth aspect is that a rear protrusion of the cushioning material is brought into contact with the inner surface so that the outer shaft can swing in the longitudinal direction and the radial direction with respect to the inner shaft.

  Furthermore, the inner shaft of the writing instrument, the tip member and the gripping portion of the inner shaft, each of which is made of a soft material and is made of a material harder than the buffer material, which is covered with the soft material. A front stage and a rear stage are formed on the inner surface of the outer shaft, the buffer material is brought into contact with the front stage and the rear stage of the outer shaft, and the buffer material is brought into contact with the inner surface of the outer shaft to The sixth aspect is that the outer shaft is configured to be swingable in the longitudinal direction and the radial direction.

  Furthermore, a groove extending in the circumferential direction is formed in the gripping portion of the front member and the inner shaft, and a ring-shaped cushioning material is attached to each of the concave grooves, and the cushioning material is brought into contact with the front and rear stages of the outer shaft. The seventh aspect is that the cushioning material is brought into contact with the inner surface of the outer shaft.

  Furthermore, an eighth aspect is that the outer shaft is made of a non-soft material that cannot be deformed.

  The shaft cylinder of the writing instrument of the present invention has a cushioning material provided at the gripping portion of the inner shaft and made of a soft material, and an outer shaft made of a material harder than the cushioning material and placed on the outside of the cushioning material. In addition, since the outer shaft swings in the longitudinal direction and the radial direction with respect to the inner shaft, a soft writing feeling can be obtained when writing.

FIG. 1 is a partial cross-sectional view showing a shaft cylinder of a writing instrument according to Embodiment 1 of the present invention. Example 1 FIG. 2 is an enlarged partial sectional view showing a main part of FIG. Example 1 FIG. 3 is an enlarged partial cross-sectional view of a main part showing a shaft cylinder of a writing instrument according to Embodiment 2 of the present invention. (Example 2) FIG. 4 is an enlarged partial cross-sectional view of a main part showing a shaft cylinder of a writing instrument according to Embodiment 3 of the present invention. (Example 3) FIG. 5 is an enlarged sectional view taken along line AA of FIG. (Example 3) FIG. 6 is an enlarged partial cross-sectional view showing a main part of a shaft tube of a writing instrument according to Embodiment 4 of the present invention. (Example 4)

  The outer shaft oscillated in the longitudinal direction and the radial direction at the time of writing, and a writing instrument shaft cylinder that can obtain a soft writing feeling even if the core and the tip of the pen, such as a mechanical pencil and a ballpoint pen, are made of a hard material has been realized.

  Hereinafter, based on FIG.1 and FIG.2, the axial cylinder of the writing instrument of Example 1 in this invention is demonstrated. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, the rear shaft 2 is detachably screwed to the rear portion of the inner shaft 1, and the clip 3 is integrally formed on the rear shaft 2. Two concave grooves 1B extending in the circumferential direction are formed in parallel before and after the grip portion 1A of the inner shaft 1. Two shock-absorbing materials 4 composed of O-rings made of a soft material such as rubber are fitted in parallel to the concave groove 1B of the inner shaft 1 and attached. Further, the outer shaft 5 made of synthetic resin or metal and made of a non-soft material is formed. The outer shaft 5 may be made of a harder rubber than the buffer material 4. Further, a front stage 5A and a rear stage 5B are formed on the inner surface of the outer shaft 5, and a protrusion 5C is formed on the rear end of the outer shaft 5. The outer shaft 5 is placed on the outer side of the buffer material 4, the front buffer material 4 is brought into contact with the front stage 5A and the inner surface of the outer shaft 5, the rear buffer material 4 is brought into contact with the rear stage 5B and the inner surface, and the outer shaft 5 The protrusion 5C is engaged with the notch 2A of the rear shaft 2. An appropriate gap is formed between the protrusion 5C of the outer shaft 5 and the rear shaft 2. Therefore, the outer shaft 5 is configured to be swingable in the longitudinal direction and the radial direction with respect to the rear shaft 2 but not to be rotatable.

  A front member 6 is detachably screwed to the front portion of the inner shaft 1. Further, gaps are formed between the front member 6 and the outer shaft 5, and between the outer shaft 5 and the rear shaft 2, and the outer shaft 5 is configured to be swingable in the longitudinal direction and the radial direction with respect to the inner shaft 1. The inner shaft 1, the cushioning material 4, the outer shaft 5 and the rear shaft 2 constitute a writing cylinder.

  In the shaft cylinder of this writing instrument, a mechanical part of a conventionally known mechanical pencil, a refill of a ballpoint pen, and the like are built in to constitute a writing instrument.

  When writing with the above writing instrument, the cushioning material 4 is bent and the outer shaft 5 swings in the longitudinal direction, and the cushioning material 4 is compressed so that the outer shaft 5 swings in the radial direction. You can write with a soft writing feeling. Further, when the outer shaft 5 is made of a non-soft material, the outer shaft 5 is not deformed even if the outer shaft 5 is held firmly, so that the outer shaft 5 can swing reliably.

  Next, the shaft cylinder of the writing instrument according to the second embodiment of the present invention will be described with reference to FIG. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, protrusions 14A extending in the circumferential direction are formed on the front and rear portions of the surface of the cushioning material 14 made of a soft material such as rubber. The cushioning material 14 is externally fitted to the gripping portion 11 </ b> A of the inner shaft 11.

  Further, the outer shaft 15 made of synthetic resin or metal and made of a non-soft material is formed. The outer shaft 15 may be made of a harder rubber than the cushioning material 14. A front stage 15A and a rear stage 15B are formed on the outer shaft 15. The outer shaft 15 is fitted on the outer side of the cushioning material 14, the front ridge 14 </ b> A of the cushioning material 14 is brought into contact with the front stage 15 </ b> A and the inner surface of the outer shaft 15, and the cushioning material 14 is disposed on the rear stage 15 </ b> B and the inner surface of the outer shaft 15. The rear protrusion 14 </ b> A is brought into contact with the cushioning member 14 so that the outer shaft 15 is not detached. Further, it is preferable that the cushioning material 14 has a rubber hardness of about 15 so that the outer shaft 15 can swing.

  A front member 16 is detachably screwed to the front portion of the inner shaft 11. Further, gaps are formed between the front member 16 and the outer shaft 15, and between the outer shaft 15 and the rear shaft 2, so that the outer shaft 15 can swing in the longitudinal direction and the radial direction with respect to the inner shaft 11. The inner shaft 11, the cushioning material 14, the outer shaft 15 and the rear shaft 2 constitute a writing cylinder.

  When writing with the above-mentioned writing instrument, the protrusion 14A of the cushioning material 14 is bent and the outer shaft 15 swings in the longitudinal direction, and the cushioning material 14 is compressed and the outer shaft 15 swings in the radial direction. Sometimes you can write with a soft writing feeling like writing with a brush.

  Next, based on FIG.4 and FIG.5, the axial cylinder of the writing instrument of Example 3 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the rear shaft 12 is formed by integral molding at the rear portion of the inner shaft 21. Further, a cushioning material 24 made of a soft material such as a thermoplastic elastomer is formed on the grip portion 21A of the inner shaft 21 by two-color molding. Furthermore, a front protrusion 24B and a rear protrusion 24C are formed at equal intervals in the circumferential direction at the front and rear of the surface of the cushioning material 24.

  Further, the outer shaft 25 made of synthetic resin or metal and made of a non-soft material is formed. The outer shaft 25 may be made of a harder rubber than the buffer material 24. An inner flange 25D is formed on the inner surface of the front portion of the outer shaft 25. The front end surface of the inner flange 25D is formed vertically and the rear end is formed on an inclined surface.

  The outer shaft 25 is put on the inner shaft 21 on a cushioning material 24 formed by two-color molding from the front, and an inner flange 25D of the outer shaft 25 is mounted over the front protrusion 24B of the cushioning material 24. Further, the front protrusion 24 </ b> B of the cushioning material 24 contacts the front end and the inner surface of the inner collar 25 </ b> D of the outer shaft 25, and the rear projection 24 </ b> C of the buffer material 24 contacts the inner surface of the outer shaft 25. Further, the rear end of the outer shaft 25 comes into contact with the stepped portion 12 </ b> B of the rear shaft 12.

  The front member 6 is detachably screwed to the front portion of the inner shaft 21. Further, a gap is formed between the tip member 6 and the outer shaft 25, and the outer shaft 25 is configured to be able to swing forward and radially in the longitudinal direction with respect to the inner shaft 21. The inner shaft 21, the cushioning material 24, the outer shaft 25, and the rear shaft 12 constitute a shaft cylinder of a writing instrument.

  In the shaft cylinder of this writing instrument, a mechanical part of a conventionally known mechanical pencil, a refill of a ballpoint pen, and the like are built in to constitute a writing instrument.

  When writing with the writing instrument, the front projection 24B of the cushioning material 24 is bent and the outer shaft 25 swings in the longitudinal direction, and the front projection 24B and the rear projection 24C of the cushioning material 24 are compressed to form the outer shaft. 25 is swung in the radial direction, and writing can be performed with a soft writing feeling as if written with a brush.

  Next, based on FIG. 6, the shaft cylinder of the writing instrument of Example 4 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. In addition, a writing instrument in which a mechanical part of a mechanical pencil is built in the shaft cylinder of the writing instrument will be described. First, the rear shaft 2 is detachably screwed to the rear portion of the inner shaft 31. A concave groove 31B extending in the circumferential direction is formed in the rear portion of the grip portion 31A of the inner shaft 31. A buffer material 34 composed of an O-ring made of a soft material such as rubber is fitted and attached to the concave groove 31B of the inner shaft 31.

  Further, the outer shaft 35 made of synthetic resin or metal and made of a non-soft material is formed. The outer shaft 35 may be made of a harder rubber than the buffer material 34. Further, a front stage 35A and a rear stage 35B are formed on the inner surface of the outer shaft 35, and a protrusion 35C is formed on the rear end of the outer shaft 35. The outer shaft 35 is placed on the outer side of the buffer material 34, the rear stage 35 </ b> B and the inner surface of the outer shaft 35 are brought into contact with the buffer material 34 provided on the inner shaft 31, and the protrusion 35 </ b> C of the outer shaft 35 is notched on the rear shaft 2. Engage with part 2A.

  Further, a concave groove 26A extending in the circumferential direction is formed on the rear surface of the tip member 26, and a cushioning material 34 composed of an O-ring made of a soft material such as rubber is fitted and attached to the concave groove 26A.

  After the mechanical part of the mechanical pencil is built in the inner shaft, the tip member 26 is detachably screwed to the front portion of the inner shaft 31. Further, the cushioning material 34 provided in the concave groove 26 </ b> A of the tip member 26 is brought into contact with the front stage 35 </ b> A and the inner surface of the outer shaft 35. In addition, a gap is formed between the outer surface of the front member 26 and the inner surface of the outer shaft 35, and a gap is formed between the outer shaft 35 and the rear shaft 2. And is configured to be swingable in the radial direction. The inner shaft 31, the cushioning material 34, the outer shaft 35, and the rear shaft 2 constitute a writing cylinder.

  When writing with the above writing instrument, the cushioning material 34 is bent and the outer shaft 35 swings in the longitudinal direction, and the cushioning material 34 is compressed and the outer shaft 35 swings in the radial direction. You can write with a soft writing feeling.

  Note that the present invention is not limited to the above-described embodiments, and the members such as the inner shaft, the rear shaft, and the core tank are illustrated as one component for simplification of description, but two or more of each are illustrated. These parts may be integrated by screwing and fitting. Furthermore, the outer diameter shape is not limited to that shown in the drawing.

  At the time of writing, the cushioning material provided between the inner shaft and the outer shaft is compressed to swing the outer shaft with respect to the inner shaft, and can be applied to a shaft tube of a writing instrument that can be written with a soft writing feeling.

DESCRIPTION OF SYMBOLS 1 Inner shaft 1A Gripping part of inner shaft 1 1B Groove of inner shaft 1 4 Buffer material 5 Outer shaft 5A Front stage of outer shaft 5 5B Rear stage of outer shaft 5 11 Inner shaft 11A Holding part of inner shaft 11 14 Buffer material 14A Buffer Projection of material 14 15 Outer shaft 15A Front stage of outer shaft 15 15B Rear stage of outer shaft 15 21 Inner shaft 21A Holding portion of inner shaft 21 24 Buffer material 24B Front projection of cushion material 24 24C Rear projection of cushion material 24 25 Outer shaft 25C Inner shaft 31 of outer shaft 25 Inner shaft 31A Grasping portion 31B of inner shaft 31 Recessed groove of inner shaft 31 34 Buffer material 35 Outer shaft 35A Front stage of outer shaft 35 35B Rear stage of outer shaft 35

Claims (8)

  An inner shaft of the writing instrument, a cushioning material provided on the gripping portion of the inner shaft and made of a soft material, and an outer shaft covered on the outer side of the cushioning material and made of a material harder than the cushioning material. The front and rear stages are formed on the inner surface of the shaft, the buffer material is brought into contact with the front and rear stages of the outer shaft, and the buffer material is brought into contact with the inner surface of the outer shaft. A writing instrument shaft cylinder characterized by being configured to be swingable.   Two concave grooves extending in the circumferential direction are formed in the grip portion of the inner shaft at the front and rear, and ring-shaped cushioning materials are attached to the respective concave grooves, and the cushioning material is brought into contact with the front and rear stages of the outer shaft and the outer The shaft cylinder of a writing instrument according to claim 1, wherein a buffer material is brought into contact with the inner surface of the shaft.   2. Two protrusions extending in the circumferential direction on the surface of the cushioning material are formed on the front and rear sides, and the protrusions are brought into contact with the front and rear stages of the outer shaft and the inner surface of the outer shaft. The shaft of the writing instrument.   A plurality of front protrusions are formed at equal intervals in the circumferential direction on the front side of the surface of the cushioning material, and a plurality of rear protrusions are formed at equal intervals in the circumferential direction on the rear side of the surface. The shaft cylinder of the writing instrument according to claim 1, wherein the rear projection is brought into contact with the rear stage and the inner surface of the outer shaft while being brought into contact with the inner surface.   An inner shaft of the writing instrument, a cushioning material provided on the gripping portion of the inner shaft and made of a soft material, and an outer shaft covered on the outer side of the cushioning material and made of a material harder than the cushioning material. An inner flange is formed on the inner surface of the shaft, a front end surface of the inner flange is formed vertically and a rear end is formed on an inclined surface, and a front protrusion and a rear protrusion are formed on the cushioning material.構成 The front projection of the cushioning material is brought into contact with the front end and the inner surface, and the rear projection of the cushioning material is brought into contact with the inner surface of the outer shaft so that the outer shaft can swing in the longitudinal and radial directions with respect to the inner shaft. A writing instrument shaft.   The inner shaft of the writing instrument, a plurality of cushioning materials each made of a soft material and provided on the gripping part of the tip member and the inner shaft, and the outer shaft made of a material harder than the cushioning material and placed on the outer side of the cushioning material And forming a front stage and a rear stage on the inner surface of the outer shaft, contacting the buffer material with the front stage and the rear stage of the outer shaft and contacting the buffer material with the inner surface of the outer shaft, A shaft of a writing instrument which is configured to be swingable in a longitudinal direction and a radial direction.   Concave grooves extending in the circumferential direction are formed in the gripping portion of the tip member and the inner shaft, respectively, and ring-shaped cushioning materials are attached to the respective concave grooves, and the cushioning materials are brought into contact with the front and rear stages of the outer shaft and are The shaft cylinder of a writing instrument according to claim 6, wherein a buffer material is brought into contact with the inner surface of the shaft.   The shaft of the writing instrument according to any one of claims 1 to 7, wherein the outer shaft is made of a non-soft material that cannot be deformed.

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