JP3942164B2 - Writing instrument shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing cylinder.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, writing instruments that constitute a shaft cylinder by connecting a plurality of cylindrical shaft members made of resin formed by injection molding are well known. By forming the shaft member with a transparent resin, a shaft is formed. In recent years, a structure in which the internal structure of the cylinder can be viewed from the outside has been favored. Note that the writing instrument using such a transparent shaft member has a structure in which a cylindrical body is disposed with a slight gap from the inner peripheral surface inside the transparent shaft member. In such a structure, a thin sheet member such as a seal is pasted on the surface of the cylindrical body, and there is also an interesting one in which a design such as a seal can be appreciated through a transparent shaft member from the outside. It has been. Note that when a structure such as a seal can be viewed from the outside, it is often used as a front shaft member in a grip portion where the clip disposed on the shaft tube does not hinder viewing.
[0003]
By the way, in the structure which arrange | positions a cylindrical body in the inside of the transparent shaft member mentioned above, naturally the resin material which forms a shaft member for the use is highly preferable, and also with a front shaft member and Since a gap is formed between the cylindrical body and the material, a material having high transparency such as a hard acrylic resin is inevitably selected.
[0004]
[Problems to be solved by the invention]
By the way, in the case of high transparency such as hard acrylic resin, even if the gate mark at the time of injection molding is small, its presence is easily noticeable, and if the gate mark is exposed to the outside, the gate mark However, there is a problem that the aesthetic appearance of the shaft member, which is transparent, is impaired, and that it obstructs the appreciation of the design such as the seals. In particular, when a transparent hard shaft member is used as a front shaft member corresponding to a gripping part of a writing instrument, the gate mark is hard because the shaft member is hard, and the gate mark is in contact with the hand. There has been a problem that the touch of the hand holding the shaft cylinder becomes worse.
[0005]
In view of these facts, the present invention, even when a transparent hard resin is used as a front shaft member corresponding to a gripping part of a writing instrument, the trace of the spout at the time of injection molding impairs the aesthetics of the transparent shaft member. An object of the present invention is to provide a writing tool shaft that does not obstruct the appreciation of an image such as an inherent seal or the like and does not deteriorate the feeling of the hand holding the shaft when writing.
[0006]
[Means for Solving the Problems]
Next, the present invention devised to solve the above problems will be described.
“1. A cylindrical member is arranged inside a front shaft member made of a transparent hard resin having a pouring trace at the time of injection molding at one end portion with a gap between the inner surface of the front shaft member. A front member protruding from the front end of the cursive body is disposed at the front end portion, a rear shaft member is disposed at the rear end portion of the cylindrical member, and the end portion of the front shaft member having a trace of the front and the front member or the rear shaft An annular elastic member is disposed between the member, the front member and the rear shaft member are screwed or press-fitted into the cylindrical member, and the front shaft member is sandwiched between the front member and the rear shaft member. A shaft cylinder of a writing instrument in which a gate mark of a front shaft member is covered with a front member or a rear shaft member so as to be invisible from the outside.
2. A cylindrical member is arranged inside the front shaft member made of a transparent hard resin having a concave portion at one end and a trace of the pouring gate at the time of injection molding. A tip member that projects the writing body from the front end is arranged at the front end portion of the cylindrical member, a rear shaft member is arranged at the rear end portion of the cylindrical member, and the front member and the rear shaft member are screwed or press-fitted into the cylindrical member. A shaft cylinder of a writing instrument that is fitted and sandwiches a front shaft member between a front member and a rear shaft member, and coats the trace of the front shaft member with the front member or the rear shaft member so as to be invisible from the outside.
3. A cylindrical member is arranged inside the front shaft member made of a transparent hard resin having a concave portion at one end and a trace of the pouring gate at the time of injection molding. An annular elastic member is disposed between the end portion of the front shaft member having the gate mark and the tip member or the rear shaft member, and the writing body projects from the tip to the front end portion of the cylindrical member. The member is disposed, the rear shaft member is disposed at the rear end portion of the tubular member, the front member and the rear shaft member are screwed or press-fitted into the tubular member, and the front shaft member is connected to the front member and the rear shaft member. A shaft cylinder of a writing instrument that is sandwiched between and covered with a tip member or a rear shaft member so as to be invisible from the outside.
4). The front shaft member has a shape in which a small diameter portion having a small shaft diameter is provided at one end portion and a pouring trace is provided in the small diameter portion, and the small diameter portion is covered with a front member or a rear shaft member. The shaft cylinder of the writing instrument according to any one of the above. "
[0007]
The invention according to claim 1 is that the gate mark provided at the end of the front shaft member is covered with the tip member or the rear shaft member and is not exposed to the outside, so that the gate mark is transparent. It does not impair the aesthetics it has, obstruct the appreciation of the internal seals, etc., and it does not deteriorate the feel of the hand that grips the shaft when writing. By disposing an annular elastic member between the front member or the rear shaft member, even if a rotational force is applied to the front shaft member due to a gripping force on the shaft cylinder, the elastic member that comes into contact with the front shaft member This is because rotation can be prevented by the frictional force. Further, since the elastic member itself is covered with the gate mark, it is not exposed to the outside and does not impair the aesthetics of the writing instrument.
[0008]
The invention according to claim 2 is that the gate mark provided on the end portion of the front shaft member is covered with the tip member or the rear shaft member and is not exposed to the outside, so that the gate mark is transparent. It does not impair the aesthetics it holds, obstructs the appreciation of internal seals and other pictures, and does not impair the feel of the hand holding the shaft during writing. By providing in the recess formed in the part, the gate mark does not come into contact with the front member or the rear shaft member that is connected to the front shaft member, so that it is possible to prevent the connection from being hindered.
[0009]
According to the third aspect of the present invention, even if a rotational force is applied to the front shaft member due to the gripping force on the shaft cylinder, rotation can be prevented by the frictional force of the elastic member with which the front shaft member abuts. This is because, even when an annular elastic member is provided, the gate mark does not come into contact with the elastic member, so that the elastic member is not cut by the gate mark.
[0010]
According to a fourth aspect of the present invention, the portion of the front shaft member having the gate mark is made smaller in diameter so that the outer surface of the front shaft member and the outer surface of the front member or rear shaft member connected to the front shaft member This is because the level difference can be eliminated.
[0011]
In addition, if the front shaft member is made of a hard acrylic resin, the pattern such as a seal incorporated in the front shaft member can be seen particularly well due to the transparency unique to the hard acrylic resin.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. In this embodiment, the case of a knock-type ballpoint pen is described. However, the present invention is not limited to a ballpoint pen, and can be used for a shaft of a writing instrument such as a fountain pen, a mechanical pencil, or a sign pen. it can. Moreover, in the knock type ball-point pen in this Embodiment, the side with the writing body of a writing instrument is expressed as the front, and the opposite side is expressed as the back. When the same member and the same part are shown, the same code | symbol is attached | subjected.
[0013]
The knock type ball-point pen of this Embodiment is shown in FIGS. FIG. 1 is an overall view in cross section of the main part of the knock type ballpoint pen of the present embodiment. FIG. 2 is an enlarged cross-sectional view of a main part of FIG. FIG. 3 is an exploded view of the main part. The knock-type ballpoint pen 1 includes a cylindrical member 4 provided with an inner surface 2a and a gap 3 inside the cylindrical front shaft member 2 made of a transparent hard acrylic resin, and a front end portion of the cylindrical member 4 A shaft member 8 is configured by arranging a tip member 6 that protrudes the writing body 5 a of the refill 5 from the tip thereof on 4 a, and a cylindrical rear shaft member 7 on the rear end portion 4 b of the tube member 4. In the present embodiment, the tip member 6 is fitted to the cylindrical member 4 and the male screw portion 6a formed on the outer surface of the tip member 6 is screwed to the female screw portion 4c formed on the inner surface of the cylindrical member 4. It is. Further, the rear shaft member 7 is attached to the cylindrical member 4, and the rear end portion 4 b of the cylindrical member 4 is press-fitted into the front end opening portion 7 a of the rear shaft member 7. Although not described in detail because it is not related to the gist of the present invention, the rear end portion 7b of the rear shaft member 7 is provided with a clip body 9 having a clamping piece 9a. A knock body 10 for operating a knock mechanism (not shown) disposed inside the rear shaft member 7 is provided so as to protrude.
[0014]
The knock-type ballpoint pen 1 is provided with a small diameter portion 2c having a one-stage shaft diameter smaller than the outer shape of the front shaft member 2 at the rear end portion 2b of the front shaft member 2, and a concave portion 2d is formed in the small diameter portion 2c. 2d is provided with a gate mark 2e at the time of injection molding. Moreover, as shown in FIG. 2, the gate mark 2e formed in the front shaft member 2 is covered with the front end portion 7c of the rear shaft member 7, and is assembled in a state invisible from the outside. Further, in the present embodiment, as shown in the figure, the outer surface from the front shaft member 2 to the rear shaft member 7 is substantially flush. An O-ring 11 made of rubber resin is disposed between the small-diameter portion 2c of the front shaft member 2 and a step portion 7d formed in the front end opening 7a of the rear shaft member 7. Therefore, the front shaft member 2 is sandwiched between the front member 6 and the rear shaft member 7 via the O-ring 11 and is held in a state in which the front shaft member 2 is prevented from rotating by the O-ring. In the present embodiment, the gate mark 2e is provided in the recess 2d, so that the gate mark 2e does not contact the O-ring 11.
[0015]
FIG. 4 is an enlarged cross-sectional view of a main part of another embodiment. As shown in the figure, in the present embodiment, the rear end portion 20b of the front shaft member 20 is not formed with a small-diameter portion, so that the gate is raised in a state where the rear shaft member 70 is raised by one step with respect to the front shaft member 20. The trace 20e is covered from the outside invisible. In the present embodiment, the O-ring 11 made of rubber resin is disposed between the front shaft member 20 and the stepped portion 70c formed in the front end opening 70a of the rear shaft member 70. Since other points are the same as those of the above-described embodiment, description thereof is omitted.
[0016]
【The invention's effect】
Since the shaft of the writing instrument of the present invention has the above-described structure, the gate mark at the time of injection molding impairs the aesthetics of the shaft member that is transparent, obstructs the appreciation of the design such as the internal seal, and writing. At this time, the feeling of the hand holding the shaft cylinder is not deteriorated.
[Brief description of the drawings]
FIG. 1 is an overall view in cross section of a main part of a knock type ballpoint pen according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of FIG.
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is an enlarged cross-sectional view of a main part of another embodiment.
[Explanation of symbols]
1 ... Knock-type ballpoint pen,
2, 20 ... front shaft member, 2a ... inner surface, 2b, 20b ... rear end portion, 2c ... small diameter portion,
2d ... concave portion, 2e, 20e ... gate mark, 3 ... gap,
4 ... cylindrical member, 4a ... front end part, 4b ... rear end part, 4c ... female screw part,
5 ... refill, 5a ... cursive, 6 ... tip member, 6a ... male screw part,
7, 70 ... rear shaft member, 7a, 70a ... front end opening, 7b ... rear end,
7c, 70c ... front end, 7d, 70d ... step,
8 ... Shaft cylinder, 9 ... Clip body, 9a ... Clamping piece, 10 ... Knock body,
11 ... O-ring.

Claims (4)

Inside the front shaft member made of a transparent hard resin having a pouring trace at the time of injection molding at one end portion, a cylindrical member is arranged with a gap between the inner surface of the front shaft member, and the front end portion of the cylindrical member A tip member that protrudes the writing body from the tip thereof, a rear shaft member is arranged at the rear end portion of the cylindrical member, and an end portion having a trace of the front shaft member and the front member or the rear shaft member An annular elastic member is disposed between the front member and the rear shaft member, and the front member is sandwiched between the front member and the rear shaft member. A shaft cylinder of a writing instrument in which a gate mark of a member is covered with a front member or a rear shaft member so as to be invisible from the outside. A cylindrical member is arranged inside the front shaft member made of a transparent hard resin having a concave portion at one end and a trace of the pouring gate at the time of injection molding. A tip member that projects the writing body from the front end is arranged at the front end portion of the cylindrical member, a rear shaft member is arranged at the rear end portion of the cylindrical member, and the front member and the rear shaft member are screwed or press-fitted into the cylindrical member. A shaft cylinder of a writing instrument that is fitted and sandwiches a front shaft member between a front member and a rear shaft member, and coats the trace of the front shaft member with the front member or the rear shaft member so as to be invisible from the outside.  A cylindrical member is arranged inside the front shaft member made of a transparent hard resin having a concave portion at one end and a trace of the pouring gate at the time of injection molding. An annular elastic member is disposed between the end portion of the front shaft member having the gate mark and the tip member or the rear shaft member, and the writing body projects from the tip to the front end portion of the cylindrical member. The member is disposed, the rear shaft member is disposed at the rear end portion of the tubular member, the front member and the rear shaft member are screwed or press-fitted into the tubular member, and the front shaft member is connected to the front member and the rear shaft member. A shaft cylinder of a writing instrument that is sandwiched between and covered with a tip member or a rear shaft member so that the trace of the gate is not visible from the outside. 4. The front shaft member has a shape in which a small diameter portion having a small shaft diameter is provided at one end portion and a pouring trace is provided in the small diameter portion, and the small diameter portion is covered with a tip member or a rear shaft member. The shaft cylinder of the writing instrument according to any one of the above.

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