WO2005012001A1

WO2005012001A1 - Shaft tube for writing implement

Info

Publication number: WO2005012001A1
Application number: PCT/JP2004/010723
Authority: WO
Inventors: Kazuyoshi Karaki; Norio Moriyama
Original assignee: Kabushiki Kaisha Pilot Corporation
Priority date: 2003-07-31
Filing date: 2004-07-28
Publication date: 2005-02-10
Also published as: CN100475553C; JPWO2005012001A1; JP4364868B2; CN1832866A

Abstract

[PROBLEMS] A shaft tube for a writing implement, the shaft tube being easy to assemble. [MEANS FOR SOLVING PROBLEMS] A shaft tube (1) for a writing implement has a holding portion (3) and a grip member (G). The holding portion (3) has an engagement portion (4) for grip installation and is smaller in diameter than other portions of the shaft tube. The grip portion (G) has a to-be-engaged portion (8b) engaging the engagement portion (4) for grip installation and is installed on the holding portion (3) with the engagement portion (4) for grip installation and the to-be-engaged portion (8b) engaged with each other for circumferential positioning. The shaft tube (1) is formed by two-color forming using a hard resin (8) and a soft resin (9). A portion of the hard resin (8) is exposed to the outside and the hard resin and the soft resin are exposed to the inside. The shaft tube (1) has the grip member (G) having the to-be-engaged portion (8b) formed on the hard resin exposed to the inside.

Description

Specification

Shaft of writing instrument

Technical field

The present invention relates to a barrel of a writing instrument in which a grip member is attached to a grip portion of the barrel.

Background art

[0002] Conventionally, a shaft cylinder of a writing tool in which a grip member made of an elastic body is attached to a grip portion of the shaft cylinder is well known.

[0003] In such a writing instrument, the grip member is formed integrally with the barrel by two-color molding, or formed in advance by forming the grip member formed in advance into a tip portion member and a grip portion of the barrel with smaller diameters than other barrels. It is installed by being inserted between the steps.

Further, as a writing instrument formed by covering a soft resin by two-color molding so that a part of the hard resin is exposed to the outside, the applicant of the present application has disclosed Japanese Patent Application Laid-Open No. 10-297161. No. "The barrel of a writing instrument or applicator".

In addition, a structure in which the grip member is fitted so as not to rotate between stepped portions formed by making the grip portion of the tip member and the grip portion of the shaft cylinder smaller in diameter than the other shaft cylinders. Japanese Utility Model Laid-Open Publication No. 7-7985, "Anti-slip device for writing instrument", an elastic cylindrical body made of an elastic material such as rubber, with a raised or recessed edge on the outer peripheral surface of the finger rest on the tip end side of the writing instrument A recessed edge or flange is partially provided on the inner peripheral surface of the elastic member along at least each axial direction, and the recessed edge or flange of the finger contact part is engaged with the flange or recessed edge of the elastic cylinder. There is disclosed an anti-slip device for a writing instrument, in which the finger rest is inserted into an elastic cylinder.

Patent Document 1: "Japanese Patent Application Laid-Open No. 10-297161 (Japanese Patent Application No. 9-123441)"

Patent Document 2: "Japanese Utility Model Application No. 7-7985"

Disclosure of the invention

Problem that invention tries to solve

However, by coating the soft resin by two-color molding, it is preferable because the grip member does not rotate or rotate with respect to the barrel, but it is preferable that it is integral with the barrel and the hard resin as described above. The shape of the exposed part, considering that part of it is exposed to the outside The shape may have been limited by other barrel shapes. In addition, since the wall thickness is increased, there is a possibility that a sink mark (dent) may occur at the exposed portion.

Further, the concave and / or convex portion (engaged portion) formed on the inner wall of the grip member and the convex and / or concave portion (gripping attachment engaging portion) formed on the shaft cylinder are engaged in a concavo-convex manner If the grip member is a soft resin, the concave and / or convex part formed on the inner wall of the grip member and the convex and / or concave part formed on the shaft cylinder at the corresponding position Even in the absence of pressure, when a certain amount of pressing force is applied, the convex portions of the soft resin are elastically deformed, or a portion opposed to the convex portions of the shaft cylinder is also elastically deformed and can be fitted. Therefore, there is a problem that it is difficult to make the position in the rotational direction of the drip member constant with respect to the shaft cylinder, and it is difficult to make the position in the rotational direction of the grip constant particularly in a mechanical assembly. In a grip member having a part of the hard resin as in the present invention exposed to the outside and having decorative orientation, it is important to make the position of the grip member in the rotational direction constant with respect to the barrel.

[0008] In view of the above-mentioned circumstances, the present invention has as its first technical object to provide a cylinder for a writing tool which is easy to assemble.

In addition, the second technical problem is to make the position in the rotational direction of the grip member constant. Means to solve the problem

Next, the present invention solving the above-mentioned problems will be described. The elements of the present invention will be described in the embodiment in order to facilitate the correspondence with the elements of the specific example (embodiment) of the embodiment described later. The code of the element of is enclosed by katsuko. Further, the reason why the present invention is described in correspondence with the reference numerals of the embodiments described later is for the purpose of facilitating the understanding of the present invention, and is not for limiting the scope of the present invention to the embodiments.

(Invention)

In order to solve the above technical problems, the cylinder (1) of the writing instrument of the present invention has a grip mounting engaging portion (4) and a grip (3) smaller in diameter than other portions of the cylinder. An engaged portion (8b) engaged with the grip attachment portion (4); and the grip attachment portion (4) and the engaged portion (8b) are engaged with each other. It is an axial cylinder (1) of a writing instrument having a grip member (G) which is circumferentially positioned and attached to the grip portion (3), It is formed by two-color molding of a hard resin (8) and a soft resin (9), and a part of the hard resin (8) is exposed to the outside and inside the hard resin (8) and the soft resin (9). And the grip member (G) in which the grip mounting engaging portion (4) is formed on the hard resin (8) exposed to the inside.

[0011] Further, at least one end (9b) of the grip member (G) in the axial direction is the soft resin.

It is also possible to form by (9).

Furthermore, the grip member (G) is fitted in the grip portion (3) by press-fitting the inner wall (9a) of the soft resin (9) exposed inside to the grip portion (3) It is also possible.

In addition, after the grip attachment engaging portion (4) and the engaged portion (8b) formed on the hard resin (8) start to engage, the soft resin (9) Inner wall (9a) is the grip of the barrel

It is also possible to configure (3) so as to start the press fitting.

Furthermore, the grip member (G) may be formed of a hard resin (8) different in color from the force barrel, and a soft resin (9) different in color from the barrel and hard resin (8).

The hard resin (8) of the present invention is an AS resin, an ABS resin, a POM resin, a PS (polystyrene) resin, a PET (polyethylene terephthalate) resin, a PBT (polybutylene terephthalate) resin

, Hard resins such as PP resin, PMMA (polymethacrylic) resin, PC (polycarbonate) resin

8).

The soft resin (9) of the present invention is a thermoplastic elastomer known generally as a grip member (G) of a writing instrument, such as polystyrene-based, polyurethane-based, polyolefin-based thermoplastic elastomer 1 or the like. Among the heat fusible elastomers, in view of coating the above-mentioned hard resin (8) by two-color molding, in consideration of moldability and fusion property with the selected hard resin (8), etc. It may be selected appropriately.

(Operation of the Present Invention)

The grip member (G) is formed by two-color molding of a hard resin (8) and a soft resin (9), and the hard resin 8) is exposed to the outside, and the hard resin (8) and the soft resin (9) are exposed inside, and the hard resin (4) in which the grip mounting engaging portion (4) is exposed inside It is formed in 8). By forming the grip mounting engaging part (4) on the hard resin (8), the shaft cylinder (1) of the writing instrument can be easily made The position of the grip member (G) in the rotational direction can be made constant. In addition, when the soft resin (9) exposed inside is formed at at least one end (9b) of the grip member (G) in the axial direction, the soft resin (9) can be compressed and held. Therefore, the position of the grip member (G) or the position of the member which abuts on the soft resin (9) and whose position is determined can be determined without any gap without strict dimensional accuracy. Further, when the grip member (G) is attached to the grip portion (3), the inner wall (9a) of the soft resin (9) exposed to the inside is press fitted into the grip portion (3). In this case, rattling and rotation of the grip member (G) can be prevented, so that the cylinder (1) of the writing tool can be easily assembled. Furthermore, after the grip mounting engagement portion (4) and the engaged portion (8b) formed on the hard resin (8) start to engage, the inner wall (9a) of the soft resin (9) is formed. In the case where the grip portion (3) of the barrel starts pressing fit, the grip member (G) can be positioned before press-fitting, which further facilitates assembly. When the grip member (G) is formed of a hard resin (8) different in color from the shaft cylinder, and a soft resin (9) different in color from the shaft cylinder and the hard resin (8), a decorative grip member (G) can be provided.

Effect of the invention

According to the present invention as described above, it is possible to provide a cylinder for a writing instrument which is easy to assemble and which makes it easy to keep the position of the decorative grip member fixed so that the grip member does not rotate.

BEST MODE FOR CARRYING OUT THE INVENTION

[0019] The purpose of providing a cylinder for a writing instrument which makes the position of the decorative grip member constant is realized without impairing the assemblability.

Example 1

In the cylinder 1 of the writing instrument shown in FIGS. 1 to 4, the grip member G is attached to the grip portion 3 formed with the outer diameter of the cylinder main body 2 at a small diameter, but the grip member G is a blue hard resin in advance. 8 (ABS resin), a part of the hard resin 8 is exposed to the outside, and the black soft resin 9 (Olefin is formed so that the hard resin portion 8a and the soft resin portion 9a are formed on the inner wall of the grip member G). The system is formed by coating by two-color molding.

When mounting the grip member G to the grip portion 3 of the barrel body 2, the convex portion (grip mounting engagement portion) 4 formed on the grip portion 3 and the inner wall 8a of the hard resin portion of the grip member G are provided. Formed Engage with the concave portion (engaged portion) 8 b corresponding to the convex portion 4.

In addition, the concavo-convex engagement between the concave portion 8b of the grip member G and the convex portion 4 of the grip portion 3 is started (state of A in FIG. 4), and thereafter the mounting of the grip member G proceeds (FIG. 4 And the inner wall 9a of the soft resin portion and the hard resin portion so that the inner wall 9a of the soft resin portion of the grip member G and the grip portion 3 start press fitting (state B in FIG. 4). The positional relationship between the inner wall 8a and the convex portion 4 of the grip portion 3 is set, and the minimum inner diameter L of the inner wall 9a of the soft resin portion, the minimum inner diameter M of the inner wall 8a of the hard resin portion, and the maximum diameter of the grip portion 3 The relationship of the outer diameter N is L <N <M. Thereafter, the female screw 7 formed on the inner wall of the tip member 6 is screwed to the male screw 5 formed on the tip of the barrel body 2 to obtain the barrel of the writing tool. Although not shown, when used as a writing instrument, a ballpoint pen refill fitted with a ballpoint pen tip at the tip is housed in the shaft cylinder.

The convex portion 4 formed on the grip portion 3 of the hard cylinder main body 2 and the concave portion 8b formed on the inner wall 8a of the hard resin portion 8 of the grip member G engage with each other. Positioning becomes easy, and furthermore, since the inner wall 9a of the soft resin portion 9 is press-fit fitted to the grip portion 3 of the barrel body 2, rattling and rotation of the grip member G are reliably prevented.

After the convex portion 4 formed on the grip portion 3 of the hard cylinder main body 2 and the concave portion 8b formed on the inner wall 8a of the hard resin portion 8 of the grip member G are engaged with each other, Soft resin part 9 inner wall

Since the positioning of the grip member G can be performed before the press-fitting by starting the press-fitting into the grip portion 3 of the barrel body 2, the assembly 9a is preferable because the assembly is further facilitated.

Further, by forming one or both, preferably both end surfaces 9 b of the grip member G with soft resin, the soft resin 9 can be compressed and held when the tip member 6 is screwed. The gap is not formed between the fore-end member 6 and the grip member G, even if the dimensional accuracy is not strictly defined or the dimensional change due to the passage of time, etc.

In the present embodiment, for convenience, the relationship between the minimum inner diameter L of the inner wall 9 a of the soft resin portion 9, the minimum inner diameter M of the hard resin portion 8 and the maximum outer diameter N of the grip portion 3 is given by L <N <M. And the inner wall 9a of the soft resin portion 9 is pressed into the grip portion 3 of the barrel 1 after engagement of the convex portion 4 formed in the grip portion 3 and the recess 8b formed in the hard resin portion 8 is started. Although not shown, the minimum inner diameter of the inner wall 9a of the soft resin portion 9 and the minimum inner diameter of the hard resin portion 8 are the same, and A convex portion 4 formed on the grip portion 3 by changing the outer diameter of the grip portion 3 corresponding to the inner wall 9a of the resin portion 9 and the outer diameter of the grip portion 3 corresponding to the inner wall 8a of the hard resin portion 8; The inner wall 8a of the soft resin portion 8 may be pressed into the grip portion 3 of the barrel 1 after the engagement with the concave portion 8b formed in the hard resin portion 8 is started.

Further, in the present embodiment, the convex portion 4 is illustrated as the grip mounting engaging portion, and the concave portion 8b is illustrated as the engaged portion. However, the present invention is not limited to this. Alternatively, it is possible to use a combination of a convex portion and a concave portion, and it is also possible to use a combination of a convex portion, a concave portion and a convex portion corresponding to the grip-wearing engagement portion as the engaged portion. is there.

Furthermore, in the present embodiment, the inner wall 9a of the soft resin portion 9 to be press-fit into the grip portion 3 is disposed at the front end, but is not limited thereto. For example, it is possible to arrange the portion where the press-fit is performed at the rear end portion, and make the inner end portion 9a of the soft resin portion 9 at the tip end portion and the grip portion 3 not press-fit. is there. Furthermore, in the present embodiment, both the configuration in which the grip portion 3 and the grip member G are press-fit and the configuration in which the soft resin 9 is provided at the end portion are used. It is also possible to

Industrial applicability

The present invention can be applied to an application where it is necessary to decorate the shaft cylinder with clips, characters, pictures and the like and to specify the positions of the shaft cylinder and the grip member.

Brief description of the drawings

FIG. 1A is an explanatory view of an embodiment of a barrel of a writing instrument according to the present invention, and FIG. 1A is a partly omitted longitudinal sectional view showing the barrel of the writing instrument according to the present invention; Is a top view seen from the direction of arrow IB in FIG. 1A.

FIG. 2 is a view showing a barrel of the writing instrument before assembly in FIG.

FIG. 3 is a cross-sectional view taken along the line ΠΙ_ΠΙ in FIG. 1A.

FIG. 4 is a view showing the assembly process of the grip member in the barrel of the writing instrument, and FIG. 4 is an explanatory view of a state in which the engagement portion for mounting the drip and the engaged portion have started to be engaged; 4 is an explanatory view of a state in which the inner wall of the grip member and the grip portion have started press-fitting. Explanation of sign

1 Shaft of writing instrument,

2-shaft cylinder body,

3 grips,

4 convex part (gripping attachment engaging part),

5 male threads,

6 mouthpieces,

7 female screw,

8 hard resin,

8a Inner wall of hard resin part,

8b Recess (engaged part),

9 Soft resin part,

9a Inner wall of soft resin part.

Claims

The scope of the claims

The grip attachment portion has a grip attachment portion and a grip portion having a diameter smaller than that of the other portion of the barrel, and an engaged portion engaged with the grip attachment engagement portion. A grip member which is engaged with the engaged portion, is positioned in the circumferential direction, and is mounted on the grip portion;

The hard resin and the soft resin are formed by two-color molding of a hard resin and a soft resin, a part of the hard resin is exposed to the outside, the hard resin and the soft resin are exposed to the inside, and the hard resin is exposed to the inside. An axis cylinder of the writing instrument provided with the grip member in which a grip attachment portion is formed.

The cylinder of the writing instrument according to claim 1, wherein at least one axial end of the grip member includes a grip member formed of the soft resin.

The cylinder of the writing instrument according to claim 1 or 2, further comprising the grip member mounted on the grip portion by press-fitting the inner wall of the soft resin exposed to the inside into the grip portion. After the engagement portion for grip attachment and the engaged portion formed in the hard resin start to be engaged, the inner wall of the soft resin starts press-fitting into the grip portion of the barrel. The barrel of the writing instrument according to claim 3, characterized in that:

The writing cylinder according to any one of claims 1 to 4, wherein the grip member is formed of a hard resin different in color from the shaft cylinder, and a soft resin different in color from the shaft cylinder and the hard resin.