JP5501698B2 - 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 relates to a shaft cylinder of a writing instrument having an inner shaft, a buffer material externally fitted to the inner shaft, and an outer shaft externally fitted to the buffer material in a grip portion positioned in front of the rear shaft. The outer shaft is formed of a non-soft material that cannot be deformed, a protrusion is formed at the rear end of the outer shaft, and a notch that engages with the protrusion of the outer shaft is formed on the rear shaft. Forming a gap inside the protrusion in a state where the protrusion of the outer shaft is engaged with the notch portion of the rear shaft, forming an outer flange at the front portion of the buffer material, and the surface of the buffer material The outer shaft is configured to be able to swing in the longitudinal direction and the radial direction with respect to the inner shaft and not to rotate. The summary is as follows.

  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. In addition, there is no gap between the front and rear of the outer shaft, so the appearance is not impaired.

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 sectional view taken along line AA of FIG. (Example 2) FIG. 5 is an enlarged partial cross-sectional view of a main part showing a shaft tube of a writing instrument according to Embodiment 3 of the present invention. (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 Example 3 of the present invention. (Example 3) FIG. 7 is an enlarged partial cross-sectional view of a main part showing a shaft cylinder of a writing instrument of a reference example . ( Reference example ) FIG. 8 is an enlarged partial cross-sectional view of a main part showing a shaft cylinder of a writing instrument of a reference example . ( Reference example )

  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 10 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. A cushioning material 4 made of a soft material such as rubber is externally fitted to the grip portion 1A of the inner shaft 1.

  An outer flange 4A is formed on the front portion of the cushioning material 4, and two circumferential protrusions 4B are formed on the front and rear of the cushioning material 4. Furthermore, 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. The outer shaft 5 is fitted on the outside of the cushioning material 4, and a protrusion 5 </ b> A formed at the rear end of the outer shaft 5 is engaged with the notch 2 </ b> A of the rear shaft 2. An appropriate gap is formed between the protrusion 5A of the outer shaft 5 and the rear shaft 2. Accordingly, 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. Further, it is preferable that the cushioning material 4 has a rubber hardness of about 15 in order to configure the outer shaft 5 to be swingable.

Further, the front member 6 is detachably screwed to the front portion of the inner shaft 1, and the cushioning material 4 is disposed between the front member 6 and the outer casing 1 </ b> B of the inner shaft 1. The outer shaft 5 is held between the outer flange 4A of the cushioning material 4 and the front end of the rear shaft 2, and the protrusion 4B of the cushioning material 4 contacts the inner surface of the outer shaft 5. The inner shaft 1, the cushioning material 4, the outer shaft 5 and the rear shaft 2 constitute a writing tube 10 .

In the writing cylinder 10 , a mechanical pencil mechanism and a ball pen refill, which are generally known in the art, are built in to constitute a writing instrument.

  When writing with the above-mentioned writing instrument, the outer collar 4A of the cushioning material 4 is compressed and the outer shaft 5 swings forward in the longitudinal direction, and the protrusion 4B of the cushioning material 4 is compressed to cause the outer shaft 5 to move radially. The writing can be performed with a soft writing feeling as if writing with a brush when swinging and writing. Further, since no gap is generated between the rear end of the outer shaft 5 and the front end of the rear shaft 2 or between the outer shaft 5 and the front member 6, the appearance is not impaired. 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 be reliably swung.

Next, based on FIG.3 and FIG.4, the axial cylinder 20 of the writing instrument of Example 2 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and omits the description. First, an outer collar 14A is formed on the front portion of a cushioning material 14 made of a soft material such as rubber, and a plurality of protrusions 14B extending in the longitudinal direction at equal intervals in the circumferential direction are formed on the surface of the cushioning material 14. To do. Further, an outer shaft 5 made of synthetic resin, metal, or rubber harder than the buffer material 14 is fitted on the outside of the buffer material 14.

Furthermore, based on FIG.5 and FIG.6, the axial cylinder 30 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 omits the description. First, an outer flange 24A is formed on the front portion of the cushioning material 24 made of a soft material such as rubber, and a plurality of protrusions 24B are formed on the surface of the cushioning material 24 at equal intervals in the circumferential direction and the longitudinal direction. . Further, an outer shaft 5 made of synthetic resin, metal, or rubber harder than the buffer material 24 is fitted on the outside of the buffer material 24.
(Reference example)

Furthermore, the shaft cylinder of the writing instrument of the reference example in the present invention will be described based on FIG. 7 and FIG. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and omits the description. First, the rear shaft 12 is detachably screwed to the rear portion of the inner shaft 1. A cushioning material 34 made of a soft material such as rubber is fitted on the grip portion 1A of the inner shaft 1. An outer casing 34A is formed on the front and rear portions of the cushioning material 34, and protrusions 34C are formed at equal intervals in the circumferential direction from the outer casing 34A of the cushioning material 34. Further, protrusions 34B extending from the protrusions 34C are formed on the surface of the cushioning material 34 at equal intervals in the circumferential direction. A cylindrical outer shaft 15 is fitted on the outside of the cushioning material 34, and the outer shaft 15 is disposed between protrusions 34 </ b> C formed on the outer flange 34 </ b> A before and after the cushioning material 34. Further, the protrusion 34 </ b> B of the buffer material 34 contacts the inner surface of the outer shaft 15.

When writing is performed with the writing instrument of the above reference example , the protrusion 34C formed on the outer flange 34A before and after the cushioning material 34 is compressed so that the outer shaft 15 swings back and forth in the longitudinal direction and the projection 34B of the cushioning material 34 Thus, the outer shaft 15 is swung in the radial direction, and writing can be performed with a soft writing feeling as if written with a brush. In particular, when the outer shaft 15 is swung in the longitudinal direction, it can be swung with a weak force, so even a person with low writing pressure can perform writing with a soft writing feeling.

  In addition, this invention is not limited to the said Example, You may comprise an inner axis | shaft and a rear axis | shaft integrally. In addition, the members such as the inner shaft, the rear shaft, and the core tank are illustrated as one component for the sake of simplification. However, if two or more components are screwed and fitted to each other, they are integrated. Good. Further, in all the above embodiments, the inner shaft is covered with the buffer material, but the inner shaft and the buffer material may be formed by two-color molding. Of course, the outer shape is not limited to that shown in the figure.

  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 Holding part of the inner shaft 1 4 Cushioning material 4A Outer rod of the cushioning material 4B B Projection of the cushioning material 4 5 Outer shaft
10 Writing instrument shaft
14 cushioning material 14A outer shell of cushioning material 14B protrusion of cushioning material 14 outer shaft
20 writing instrument shaft cylinder 24 cushioning material 24A outer casing 24B cushioning material 24 projection of cushioning material 24
30 writing instrument shaft 34 buffer material 34A outer shell 34A of buffer material 34B protrusion of buffer material 34

Claims (1)

In a shaft cylinder of a writing instrument having an inner shaft, a buffer material externally fitted to the inner shaft, and an outer shaft externally fitted to the buffer material, the gripping portion located in front of the rear shaft, the buffer material is made of a soft material The outer shaft is made of a non-soft material that cannot be deformed, a protrusion is formed at the rear end of the outer shaft, and a notch that engages with the protrusion of the outer shaft is formed on the rear shaft; A gap is formed inwardly of the protrusion in a state where the protrusion of the outer shaft is engaged with the notch of the rear shaft, and an outer flange is formed on the front portion of the cushioning material, and the projection is formed on the surface of the cushioning material The outer shaft is formed in contact with the outer flange and protrusion of the cushioning material so that the outer shaft can swing in the longitudinal direction and the radial direction with respect to the inner shaft and cannot rotate. A writing cylinder.

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