JPH0595780U - Fitting structure of writing instrument members - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the burr 22 is formed on the inner edge of the opening end 21 of the shaft cylinder, the writing instrument member 3 can be securely inserted. [Structure] An annular space portion 6 for accommodating an inner edge portion of an opening end 21 of a barrel is provided when a writing instrument member 3 is inserted into the barrel opening 2. When the burr 22 is generated at the inner edge of the barrel opening 2, the burr 22 is housed in the annular space 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fitting structure for a writing instrument member. More specifically, the present invention relates to a fitting structure for a writing tool member such as a tail plug, a pen tip holder, or a cap, which is inserted into an opening of a barrel formed by synthetic resin injection molding.

[0002]

[Prior Art]

 Conventionally, in a fitting structure in which a writing tool member such as a tail plug, a pen tip holder, or a cap is inserted into the barrel opening, the fitting part of the writing instrument member is fitted into the inner wall of the barrel opening and at the same time the barrel opening is opened. A structure in which the brim portion of the writing instrument member is stopped at the end is widely known.

[0003]

[Problems to be solved by the device]

 However, generally, the barrel of a writing instrument is mostly a synthetic resin injection-molded body, and after injection molding, a thin-walled protrusion, a so-called burr, is easily generated at the end of the barrel. When the writing instrument member is attached to the barrel having the burr, in the conventional fitting structure, the burr is sandwiched between the opening end of the barrel and the brim of the writing instrument member so that the brim is opened. It is not possible to make contact with 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 on the end of the barrel before inserting the writing instrument member.

According to the present invention, even if a burr is generated at the end of the shaft cylinder, the work for removing the burr is not required, and the writing tool member is not improperly inserted or is not assembled properly. An object of the present invention is to provide a fitting structure for a writing instrument member that can be securely inserted.

[0005]

[Means for Solving the Problems]

 The fitting structure of the writing instrument member of the present invention is such that the writing instrument member 3 such as a tail plug, a pen tip holder, or a cap is inserted into the opening 2 of the barrel 1 formed by synthetic resin injection molding. The writing instrument member 3 has a flange portion 31 that comes into axial contact with the barrel opening end 21 and a fitting portion 32 that fits into the inner wall of the barrel opening 2. When the writing instrument member 3 is inserted into the shaft cylinder opening 2, the annular space 6 for accommodating the inner edge of the shaft cylinder opening end 21 is formed between the flange 31 and the fitting part 32. As a requirement.

The writing instrument member 3 may be any member that can be inserted into and attached to the shaft tube opening portion 2, and has no airtight function other than, for example, the tail plug 4, the pen tip holder 5, and the cap that require airtight fitting. It may be a member such as a crown or a tail crown having only a decorative function. Also, synthetic resin or metal is effective as the material.

The annular space portion 6 may accommodate the inner edge portion of the shaft tube opening end 21. For example, the annular recess portion 33 formed in the collar portion 31 of the writing instrument member 3 in the axial direction forms the inner edge portion of the shaft. A configuration that accommodates only the direction, a configuration that combines an annular recess 33 that is formed in the axial direction of the flange 31 of the writing instrument member 3 and a large diameter portion 23 that is formed on the inner wall of the shaft tube opening end 21 (FIGS. 1 and 2). ), Or a configuration (FIG. 3) in which the flange portion 31 of the writing instrument member 3 is formed in the axial direction and the radial direction, 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, or ABS resin. The shape of the barrel 1 may be circular, elliptical, polygonal or the like in cross section.

[0009]

[Action]

 The annular space portion 6 serves as an escape space for the burr 22 even if a burr 22 is formed on the inner edge of the shaft tube opening end 21, so that the writing instrument member 3 can be reliably inserted and attached to the shaft tube opening 2. The insertion failure due to the burr 22 does not occur. Therefore, it is not necessary to remove the above-mentioned burr 22 before inserting the writing instrument member 3.

[0010]

Embodiments of the present invention will be described with reference to the drawings. (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 protruding in a tubular shape forward, and a flange portion 31 connected to the base of the fitting portion 32. An annular recess 33 is formed on the side of the flange 31 that contacts the shaft cylinder. On the other hand, the shaft cylinder 1 is obtained by synthetic resin injection molding, a large diameter portion 23 is formed on the inner wall of the mouth of the shaft cylinder opening 2, and a burr 22 is projected on the inner edge of the shaft cylinder opening end 21. There is.

When the tail plug 4 is inserted into the shaft tube opening 2, the fitting portion 32 of the tail plug 4 is fitted to the inner wall of the shaft tube opening 2, and the collar portion 31 of the tail plug 4 is inserted. The shaft cylinder open end 21 is axially abutted. An annular space 6 is formed between the flange portion 31 and the fitting portion 32 by the annular recess 33 and the large diameter portion 23, and the annular space portion 6 removes the burr 22 on the inner edge portion of the opening end 21 of the barrel. It is housed. The annular space 6 allows the collar portion of the tail plug 4 to be formed not only when the barrel 22 is not formed at the barrel opening end 21 but also when the burr 22 is formed at the barrel opening end 21. 31 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 for reliable insertion.

Further, the large-diameter portion 23 at the mouth of the shaft tube opening 2 also allows the fitting portion 32 to be easily inserted when the tail plug 4 is inserted.

In FIG. 2, the writing instrument member 3 is a nib holder 5. The nib holder 5 holds the nib 51 in the front part, and is provided with a collar part 31 in the middle part and a cylindrical fitting part 32 in the rear part. An annular recess 33 is formed in the rear portion of the flange 31 (on the side of the shaft cylinder contact). On the other hand, in the shaft cylinder 1, as in FIG. 1, a large diameter portion 23 is provided on the inner wall of the base of the shaft cylinder opening 2, and a burr 22 projects at the inner edge of the shaft cylinder opening end 21.

When the pen tip holder 5 is inserted into the barrel opening 2, the fitting portion 32 is airtightly fitted to the inner wall of the barrel opening 2, and the flange 31 is attached to the barrel opening end 21. Are abutted. The annular recess 33 of the pen tip holder 5 and the large-diameter portion 23 of the barrel opening 2 form an annular space 6 for accommodating the burr 22 on the inner edge of the barrel opening end 21.

In FIG. 3, the writing instrument member 3 is a tail plug 4, and the tail plug 4 has an annular recess 33 in the axial direction and the radial direction formed at the rear of the fitting portion 32 and the front of the collar portion 31. The recessed portion 33 constitutes the annular space portion 6 that accommodates the inner edge portion of the shaft cylinder opening end 21 when the shaft cylinder 1 is inserted and mounted. The fitting portion 32 is fitted over the annular projection 24 on the inner wall of the opening end 21 of the barrel to keep the inside of the barrel 1 airtight. The rest of the configuration is the same as in FIG.

[0016]

[Effect of the device]

 Even if burrs are generated on the inner edge of the opening end of the barrel, the writing space can be securely inserted into the barrel opening without removing the burrs because the burr is contained in the annular space. The writing instrument member can be worn without causing a defective insertion of the writing instrument member.

[Brief description of drawings]

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

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

FIG. 3 is a longitudinal sectional view of an essential part showing the fitting structure of the present invention in which the writing instrument member is a tail plug.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Shaft cylinder opening 21 Shaft cylinder opening end 22 Burr 23 Large diameter part 24 Annular protrusion 3 Writing instrument member 31 Collar part 32 Fitting part 33 Annular recess 4 Tail plug 5 Pen tip holder 51 Pen tip 6 Annular space part

Claims (1)

[Scope of utility model registration request] 1. A fitting structure of a writing tool member, wherein a writing tool member such as a tail plug, a pen tip holder, or a cap is inserted into an opening of a barrel formed by synthetic resin injection molding. 3 has a flange portion 31 that axially abuts against the shaft tube opening end 21, and a fitting portion 32 that fits into the inner wall of the shaft tube opening portion 2. The writing instrument member 3 is attached to the shaft tube opening portion 2. A fitting structure for a writing instrument member, characterized in that, when inserted, an annular space portion 6 is formed between the collar portion 31 and the fitting portion 32 for accommodating an inner edge portion of the shaft tube opening end 21.