JP2607469Y2 - Fitting structure of writing implement members - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting structure for a writing instrument member. More specifically, the present invention relates to a fitting structure of a writing implement member for inserting a writing implement member such as a tail plug, a pen tip holder, or a cap into an opening of a shaft cylinder formed by synthetic resin injection molding.

[0002]

2. Description of the Related Art Conventionally, in a fitting structure in which a writing implement member such as a tail plug, a pen tip holder, or a cap is inserted into an opening of a barrel, the fitting portion of the writing implement member is fitted into an inner wall of the opening of the barrel. At the same time, a structure in which a flange of a writing instrument member is stopped against an opening end of a shaft cylinder is widely known.

[0003]

However, in general, the barrel of a writing instrument is almost a synthetic resin injection-molded body, and after injection molding, a thin-walled projection, that is, a so-called burr is easily generated at the end of the barrel. In a case where the writing implement member is inserted into the barrel in which the burr has occurred, in the conventional fitting structure, the burr is sandwiched between the end of the opening of the barrel and the flange of the writing implement member, and the flange is opened. The end cannot contact the end, which tends to cause incomplete insertion of the writing instrument member or defective assembly (see FIG. 4). Therefore, it is necessary to remove the burrs from the end of the barrel before inserting the writing implement member.

According to the present invention, even if burrs are formed at the end of the barrel, the work for removing the burrs is not required, and the insertion of the writing implement member or the assembly failure does not occur. An object of the present invention is to provide a writing instrument member fitting structure that can be securely inserted.

[0005]

According to the present invention, the writing instrument member is fitted with a writing instrument member 3 such as a tail plug, a pen point holder, or a cap by inserting an opening 2 of a shaft cylinder 1 formed by injection molding of a synthetic resin. The writing instrument member 3 includes a flange 31 that axially abuts the barrel opening 21 and a fitting that fits into the inner wall of the barrel opening 2. The flange 31 has an annular recess on the side of the flange 31 that contacts the barrel.
A portion 33 is formed in the axial direction, and when the writing instrument member 3 is inserted into the shaft tube opening 2, the inner edge of the shaft tube opening end 21 is accommodated between the flange portion 31 and the fitting portion 32. Annular space 6
Is provided by the annular concave portion 33 , and the axial cylinder opening end 21 and the flange portion 31 are formed in a contact state with no gap in appearance.

[0006] The writing implement member 3 may be a member that is inserted into the shaft tube opening 2 and, for example, has no airtight function other than the tail plug 4, the pen tip holder 5, and the cap that require airtight fitting. A member such as a head crown or a tail crown having only a decoration function may be used. As the material, a synthetic resin or a metal is effective.

[0007] The annular space 6 only needs to accommodate the inner edge of the opening end 21 of the shaft cylinder, for example, the flange 31 of the writing implement member 3.
The annular recess 33 formed in the axial direction accommodates only the inner edge in the axial direction. The annular recess 33 formed in the axial direction of the flange 31 of the writing instrument member 3 and the inner wall of the shaft cylinder opening end 21 are formed. (FIGS. 1 and 2) or the annular recess 33 formed in the axial and radial direction of the flange 31 of the writing instrument member 3 (FIG. 3).
And the like, but not limited thereto.

The shaft cylinder 1 is made of, for example, a synthetic resin material such as polyethylene, polypropylene, polyacetal, and ABS resin. The shape of the barrel 1 may be any of a circular cross section, an ellipse, and a polygon.

[0009]

The annular space 6 is a clearance space for the burr 22 even if the burr 22 is formed on the inner edge of the barrel tube opening end 21, so that the writing implement member 3 is securely inserted into the barrel tube opening 2. As a result, the insertion failure due to the burrs 22 does not occur. for that reason,
It is not necessary to remove the burr 22 before inserting the writing implement member 3.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. (See FIGS. 1 to 3) In FIG. 1, the writing instrument member 3 is a tail plug 4. The tail plug 4 has a fitting portion 32 which projects forward in a cylindrical shape.
And a flange portion 31 is connected to a base portion of the fitting portion 32. An annular concave portion 33 is formed on the side of the flange portion 31 that comes into contact with the shaft cylinder. On the other hand, the barrel 1 is obtained by injection molding of synthetic resin, a large-diameter portion 23 is formed on the inner wall of the mouth of the barrel 2, and a burr 22 protrudes from an inner edge of the barrel end 21. .

When the tail plug 4 is inserted into the opening 2 of the barrel, the fitting portion 32 of the tail plug 4 is fitted to the inner wall of the opening 2 of the barrel, and the flange 31 of the tail plug 4 is attached. It is in axial contact with the shaft cylinder opening end 21. The annular concave portion 33 and the large diameter portion 23 allow the annular space portion 6 between the flange portion 31 and the fitting portion 32.
The annular space 6 accommodates a burr 22 at the inner edge of the shaft tube opening end 21. Due to the annular space 6, not only when the burr 22 is not formed at the opening end 21 of the barrel, but also when the burr 22 is formed at the opening end 21 of the barrel, the flange portion 31 of the tail plug 4 is formed. Can be brought into contact with the shaft tube opening end 21, and the fitting portion 32 of the tail plug 4 can be fitted to a predetermined position on the inner wall of the shaft tube opening 2, so that reliable insertion is possible.

The large-diameter portion 23 at the two ends of the shaft cylinder opening is
It also enables easy insertion of the fitting part 32 when the tail plug 4 is inserted.

In FIG. 2, the writing instrument member 3 is a pen point holder 5. The pen tip holder 5 holds a pen tip 51 at a front part, a flange part 31 at an intermediate part, and a cylindrical fitting part 32 at a rear part. An annular concave portion 33 is formed in the rear portion of the flange portion 31 (on the side of the shaft cylinder). On the other hand, the barrel 1 has a large-diameter portion 23 provided on the inner wall near the mouth of the barrel 2 as in FIG.
A burr 22 protrudes from an inner edge of the first member.

The pen tip holder 5 is inserted into the shaft cylinder opening 2.
When the is inserted, the fitting portion 32 is air-tightly fitted to the inner wall of the shaft tube opening 2, and the flange portion 31 is brought into contact with the shaft tube opening end 21. The annular recessed portion 33 of the pen tip holder 5 and the large-diameter portion 23 of the barrel opening 2 allow the annular space 6 to accommodate the burr 22 on the inner edge of the barrel opening end 21.
Is formed.

In FIG. 3, the writing instrument member 3 is a tail plug 4. The tail plug 4 has an axially and radially annular concave portion 33 formed behind the fitting portion 32 and in front of the flange portion 31. Recess 33
Thus, the annular space portion 6 that accommodates the inner edge of the shaft tube opening end 21 when inserted into the shaft tube 1 is configured. The fitting part 32
Is fitted over the annular projection 24 on the inner wall of the shaft tube opening end 21 to maintain the airtightness in the shaft tube 1. Other configurations are the same as those in FIG.

[0016]

According to the present invention, even if burrs are generated on the inner edge of the opening end of the barrel, the burr is housed in the annular space so that the writing implement member can be removed without removing the burrs. It can be inserted securely, without causing poor insertion of the writing instrument member, and the open end of the barrel and the flange
It does not impair the appearance (appearance) due to contact without an upper gap .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a fitting structure of the present invention in which a writing implement member is a tail plug.

FIG. 2 is a longitudinal sectional view of a main part showing the fitting structure of the present invention in which the writing implement member is a pen tip holder.

FIG. 3 is a longitudinal sectional view of a main part showing the fitting structure of the present invention in which the writing implement member is a tail plug;

FIG. 4 is a vertical sectional view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft barrel 2 Shaft barrel opening 21 Shaft barrel opening end 22 Burr 23 Large diameter part 24 Annular protrusion 3 Writing implement member 31 Flange part 32 Fitting part 33 Annular concave part 4 Tail plug 5 Nib holder 51 Nib 6 Annular space

Claims (1)

(57) [Scope of request for utility model registration] 1. A fitting structure of a writing implement member for inserting a writing implement member such as a tail plug, a pen tip holder, or a cap into an opening of a barrel formed by injection molding of a synthetic resin, wherein the writing implement member is 3, the flange portion 31 abuts in the axial direction with respect to the barrel open end 21 has a fitting portion 32 which fits into the barrel opening 2 the inner wall, the barrel contact side of the flange portion 31 Annular recess 3
3 is formed in the axial direction, and the writing implement member 3 is
When inserted into the, between the flange portion 31 and the fitting portion 32,
Before the annular space 6 for accommodating the inner edge of the barrel open end 21
The shaft cylinder opening end 21 and the flange 31 are provided by the annular recess 33.
Formed in a contact state without any gap in appearance.