JP4699587B2 - Writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument in which a pen tip protrudes from a tip opening, and a cap is mounted on a shaft body having a gripping portion by getting over the fitting, and more particularly, to the arrangement of the jumping fitting protrusion with respect to the position of the holding portion. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a writing instrument is known in which a pen tip attached to the tip of a housing member housed inside projects from a tip opening, and a cap is mounted on a shaft body having a gripping portion by overcoming fitting. Many are known in which a cap is attached to the tip of a gripping part formed or attached to a shaft body, and those in which a cap is attached to cover the gripping part formed in the shaft body are also known. .
In any of the above prior art writing instruments, the fitting projection that fits over the cap is formed and arranged on the pen tip side ahead of the position of the grip portion provided on the shaft body.
[0003]
[Problems to be solved by the invention]
When the fitting projection that fits over the cap is formed and arranged closer to the pen tip side than the gripping portion, the position of the gripping portion formed on the shaft body is the same as that of the fitting projection. It must be in the longitudinal rear position.
Speaking of the gripping position of the writing instrument, in recent years, there is a tendency that the user prefers to write by gripping a position closer to the pen tip side of the shaft body. When it is arranged on the pen tip side), there is a problem that a gripping finger is applied to the fitting protrusion and the gripping feeling is impaired. In addition, there is a problem that writing is difficult when the gripping portion behind the fitting protrusion is gripped.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems, and a pen tip attached to the tip of a housing member housed inside projects from the tip opening and has a gripping portion. A writing instrument to which a cap is mounted by over-fitting, and a small-diameter portion is provided on the pen nib side of the shaft body, a grip portion is formed on the small-diameter portion, and the cap is fitted over the cap on the rear side from the position of the grip portion. The fitting protrusions to be fitted are provided on the entire circumference, and the gripping portion is formed of a soft elastomer , and a front end having a rear end portion smaller in diameter than the front end of the gripping portion is provided at the front end of the shaft body. Furthermore, while forming an attachment end having a diameter larger than that of the small-diameter portion at the rear of the fitting protrusion on the entire circumference, and forming an entire circumference recess between the fitting protrusion and the attachment end, At its mounting end, its mounting end The opening end of the cap having the same diameter as that of the cap is positioned, and the bulging portion is formed in front of the gripping portion by gradually expanding the gripping portion from the substantially central portion of the gripping portion toward the front. This is the gist.
[0005]
【Example】
Embodiments will be described with reference to the accompanying drawings. In FIG. 1, an exterior body composed of a metal or resin tip 1, a front shaft 2, and a rear shaft 3 is provided with a ballpoint pen tip 4 at the tip and a transparent polypropylene resin ink tank 6 by a joint pipe 5. A refill that is connected and fixed is housed. The rear end of the refill is positioned with its longitudinal position regulated by a rib 3 a formed at the bottom of the rear shaft 3.
The front shaft 2 and the rear shaft 3 are injection-molded products made of transparent acrylic resin or polycarbonate resin. The front shaft 2 is provided with a small diameter portion 2a extending toward the ballpoint pen tip 4 side. A grip 7 such as styrene elastomer or polyolefin elastomer is fixed to 2a by two-material molding. In this example, the grip 7 has a hole 7a at an appropriate position, and the front shaft protrusion 2b is fitted in the hole 7a.
[0006]
In FIG. 2, which is an external view of the writing instrument of FIG. 1, the front shaft 2 is formed with a circumferential rib 2c on the rear side of the position of the grip 7 to which it is fixed so as to get over and fit a cap (described later). Yes. Further, the end 2d attached to the rear shaft 3 of the front shaft 2 is formed to have a larger diameter than the small-diameter portion 2a, and the entire circumferential recess 2e is formed between the end 2d and the entire circumferential rib 2c. Yes. Note that intermittent ribs may be provided on the circumferential surface of the small diameter portion 2c instead of the entire circumferential rib 2c.
[0007]
A state in which the cap 8 is mounted on the front shaft 2 of FIG. Fitting ribs 8b are formed on the opening end 8a of the cap 8 in three or four directions. The fitting rib 8b passes over the circumferential rib 2c and the cap 8 is fitted and mounted on the front shaft 2. ing.
A soft pen tip sealing member 9 is attached to the inner side of the cap 8 while being sandwiched and prevented from being removed by the rib 8c, and the tip of the ballpoint pen tip 4 abuts or is immersed in the pen tip sealing member. By doing so, the sealing of the chip is maintained. Further, by this abutment or immersion, the lateral blur in the cap 8 at the tip of the ball-point pen tip 4 is prevented. Further, an ink color display member 9 is attached to the top (downward in the drawing) of the cap 8, and a clip 10 is attached to the side.
[0008]
A description will be given based on FIG. 4 which is an enlarged view of a portion A in FIG. An inner diameter dimension (referred to as “a”) of the opening end portion 8a of the cap 8 and an outer diameter dimension (referred to as “b”) of the end portion 2d of the front shaft 2 are set such that ab ≦ 0.02 to 0.3. Is set. In combination with the fitting of the fitting rib 8b of the cap 8 and the entire peripheral rib 2c of the front shaft 2, the lateral movement of the cap is prevented. In addition, the inscribed circle diameter dimension of the plurality of fitting ribs 8 b formed on the cap 8 is set to be larger than the outer diameter dimension of the grip 7.
Note that the inner diameter dimension (referred to as d) of the inner hole 8d of the cap 8 and the outer diameter dimension (referred to as e) at the end of the gripping portion adjacent to the entire circumferential rib 2c are expressed as de ≦ 0.02−0. .3 may be set to prevent lateral movement of the cap.
[0009]
Next, the use will be described. When writing, it is possible to write by gripping the grip 7 at a position close to the chip 4 side. A good grip and writing feeling can be obtained .
[00010]
A modification will be described with reference to FIG. A description of the same parts as those in the previous embodiment will be omitted.
In this example, a plurality of ribs 8d in the inner part of the cap 8 are extended to the rear end of the tip 1 or the front end of the grip 7 and brought into contact with each other, thereby preventing the lateral movement of the cap. It is. According to this example, even if it is a type of ballpoint pen that does not require the pen point sealing member 9, it is possible to prevent lateral blurring in the cap 8 at the tip of the ballpoint pen tip 4 and to stabilize the cap mounting.
[0011]
In addition to the above, various modifications can be made without departing from the gist of the present invention. Although the writing instrument which accommodated the refill of a ball-point pen was illustrated, this invention can be applied also to the writing instrument which accommodated the center axis set of a mechanical pencil, and this invention can be applied also to the applicator etc. which incorporated the cosmetics. It can be done.
[0012]
【The invention's effect】
The writing instrument of the present invention is a writing instrument in which a pen tip attached to the tip of a housing member accommodated in the interior projects from the tip opening, and a cap is mounted on the shaft body having a gripping part by getting over and fitting. A small-diameter portion on the pen nib side of the shaft body, a gripping portion is formed on the small-diameter portion, and a fitting protrusion is provided on the entire circumference to fit over the cap on the rear side from the position of the gripping portion, In addition, the grip portion is formed of a soft elastomer, and a tip metal having a rear end portion smaller in diameter than the front end of the grip portion is provided at the front end of the shaft body, and the fitting protrusions on the entire circumference are further provided. A mounting end portion having a diameter larger than that of the small-diameter portion is formed at the rear side, and a circumferential recess is formed between the fitting protrusion and the mounting end portion, and the mounting end portion is substantially the same as the mounting end portion. Position the open end of the cap with the same diameter. , Also the grasping portion by allowed to gradually enlarged toward the front from the substantially central portion of the grip portion, so to form a bulged portion in front of the grip portion, the grip portion of the shaft Pen It is possible to provide a writing instrument that can be arranged on the front side and is excellent in gripping feeling and writing feeling, which is suitable for a user's request to grip and write a position close to the pen tip side.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is an external view of the writing instrument in FIG.
3 is a view showing a state where a cap is mounted on the front shaft of FIG. 2 by fitting over the cap.
FIG. 4 is an enlarged view of a part A in FIG. 3;
FIG. 5 is a view showing a modified example (only a cap is shown in a vertical cross section).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lead 2 Front shaft 2a Small diameter part 2b Protrusion 2c Whole circumference rib 2d End part 2e Whole circumference recessed part 3 Rear axis 3a Rib 4 Ball-point pen tip 5 Joint pipe 6 Ink tank 7 Grip 7a Hole 7b End part 8 Cap 8a Open end part 8b Fitting rib 8c Rib 8d Inner hole 8e Rib 9 Pen tip sealing member 10 Ink color display member 11 Clip

Claims (2)

A writing instrument in which a pen tip attached to the tip of a housing member housed inside projects from a tip opening and has a gripping part mounted on a shaft by fitting over the shaft. A small-diameter portion is provided on the pen tip side, a gripping portion is formed on the small-diameter portion, and a fitting protrusion is provided around the cap on the rear side from the position of the gripping portion. A tip metal having a rear end portion smaller in diameter than the front end of the gripping portion is provided at the front end of the shaft body, and further formed from the small diameter portion behind the fitting protrusion on the entire circumference. Forming a large-diameter mounting end, and forming a recess on the entire circumference between the fitting projection and the mounting end, and opening the cap with the same diameter as the mounting end at the mounting end. Position the end and also the grip The by allowed to gradually enlarged toward the front from the substantially central portion of the grip portion, characterized in that the formation of the bulging portion in front of the grip portion writing instrument.   The writing instrument according to claim 1, wherein an inward projecting portion that abuts on the front side of the small-diameter portion is formed in the back of the cap.

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