JP4780691B2 - Fixing structure of writing instrument clip - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a structure for fixing a clip to a shaft or the like of a writing instrument made of a resin molded product.
[0002]
[Prior art]
Conventionally, as a means for fixing a clip as a separate member to a shaft body of a resin molded product made of injection molding or the like, adhesion or pressure bonding is known.
However, there are problems such as poor workability and poor adhesive appearance due to poor workability and poor fixing due to insufficient adhesive. Adhesion is unsuitable and unsuitable when the shaft or clip is transparent.
On the other hand, pressure bonding is simple and has good workability.
However, this press-fitting means also tends to be excessive press-fitting in consideration of the dimensional variation of the members, and there are many cases where jig equipment is necessary to perform the press-fitting work breakage problem and press-fitting work. That's not true.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to make it easy to attach the clip and prevent problems such as poor appearance and damage to the fixing portion even if the clip and the shaft are transparent.
[0004]
[Problems to be solved by the invention]
The present invention has the following configuration in order to achieve the above-described problems. The clip fixing structure of the writing instrument according to the first aspect of the present invention is a clip fixing structure in which the base portion of the rear end of the clip is engaged with the mounting portion of the clip provided by protruding from the outer surface of the resin shaft. In the structure, the clip is provided with a pair of opposing engaging protrusions on the inner side of the base side portion, a notch portion is formed on the upper portion of the base portion toward the front of the clip, and the clip mounting portion of the shaft body The cross-sectional shape is substantially T-shaped, and an engagement groove is formed on the side portion, and a protrusion is provided on the top, and the engagement protrusion of the clip is engaged with the engagement groove of the shaft body. In this state, the protrusion is fitted into the notch, and a step is formed in front of the clip engagement protrusion in the axial direction, and a step is formed in front of the axial end surface of the shaft body engagement groove in the axial direction. And the front of the step is inclined toward the axial center, In a state where projection is engaged with the engaging groove of the shaft, the stepped portion of the clip engaging projection is provided to engage the stepped portion of the shaft engaging groove.
[0005]
The clip fixing structure for a writing instrument according to a second aspect of the present invention is the clip fixing structure for a writing instrument according to the first aspect, wherein the cut portion and the protruding portion are formed in a U shape and are fitted to each other. It is provided as follows.
[0006]
The clip fixing structure for a writing instrument according to a third aspect of the invention is the clip fixing structure for a writing instrument according to the first or second aspect , wherein the clip mounting portion is for injection molding at the upper part in front of the protruding portion. And a concave portion is provided so that the inside of the upper portion of the base of the clip does not interfere with the gate portion as appropriate.
[0007]
【Example】
Nowadays, one of the design specifications of writing instruments is a combination of complex shapes, transparency, colored transparency, various colors, etc., such as plastic barrels, crowns, clips, mechanical parts, and other decorations made of injection molding. Composing it has become popular.
The present invention proposes a clip fixing structure for a writing instrument that satisfies the above design specifications and overcomes the above-described problems of the prior art.
In addition, the shaft body of the embodiment shows a form of a cap that covers and attaches the writing tip portion of the writing instrument, but the shaft body intended by the present invention is a shaft used for a general writing instrument such as a ballpoint pen or a sign pen. It is a cylinder and a cap.
[0008]
An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG.8 and FIG.9, the clip 2 has the ball | bowl part 3 in the front end inner surface side, and has the base 4 in the rear end. In addition, a pair of opposing engaging protrusions 5 are provided on the inner side of the base 4, and an inclined portion 5 b is provided on the lower surface of the engaging protrusion 5 (see FIG. 2). Step portions 5 a are formed in front of the portions 5 in the axial direction. Further, a U-shaped cut portion 7 a is formed on the upper portion of the base portion 4 toward the front of the clip 2.
[0009]
As shown in FIGS. 6 and 7, the shaft body 1 is a resin molded product, and is provided with a clip mounting portion 7 projecting integrally on one side of the rear outer surface.
Further, the clip mounting portion 7 of the shaft body 1 has a substantially T-shaped cross section and is formed with engaging grooves 8 on both sides, and a U-shaped protruding portion 7a is provided on the T-shaped upper portion. Yes. In addition, a step portion 8a is formed in front of the end surface of the engagement groove 8 in the axial direction, and a front portion of the step portion 8a is inclined to the axial center side. (Inclined part 8b)
Further, a gate portion 9 for injection molding protrudes from the clip mounting portion 7 at an upper portion in front of the protruding portion 7a. Although there are restrictions on design dimensions, it is also possible to provide a recess in the T-shaped upper part so that the gate part does not protrude from the upper part.
[0010]
When the clip 2 is fixed, the engaging protrusion 5 is pressed against the inclined portion 8b of the engaging groove of the shaft body, so that the engaging protrusion 5 is elastically expanded and the engaging groove 8 of the shaft body is expanded. Further, the step portion 5a of the engaging protrusion is engaged with the step portion 8a of the engaging groove, and the protruding portion 7a is fitted into the cut portion 2a. Further, since the inclined portion 5b is provided on the lower surface of the engagement protrusion 5, the engagement protrusion 5 can be easily engaged with the engagement groove 8 of the shaft body at the initial stage of engagement.
A recess 6 is provided so that the inside of the upper part of the base 4 of the clip does not interfere with the gate 9.
[0011]
[Action]
As described above, according to the present invention, the engaging protrusion 5 is elastically expanded and engaged with the engaging groove 8 of the shaft body, and the step portion 5a of the engaging protrusion is the step portion 8a of the engaging groove. Thus, the clip 2 can be mounted in a state where the clip 2 is hardly press-fitted into the shaft body 1 and cannot be pulled out. Further, the clip is prevented from being damaged by providing the inner side of the upper portion of the base portion 4 of the clip so as not to interfere with the gate portion 9.
In the case where the clip is a pressed product of a metal plate or an opaque resin molded product, there is no problem in appearance even if the gate portion interferes moderately inside the upper portion of the base portion of the clip to cause scratches.
[0012]
【The invention's effect】
According to the present invention, the clip can be easily attached to the shaft body by hand, and can be securely fixed without excessive press-fitting, so that problems such as poor appearance and breakage of the fixing portion can be prevented.
Further, in the case where the clip is a transparent resin molded product, the inner side of the upper part of the base part of the clip is provided so as not to interfere with the gate part, so that there is no occurrence of scratches and there is no problem in appearance.
[Brief description of the drawings]
FIG. 1 is a front view of an essential part cross section showing a clip fixing structure of a writing instrument of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is an explanatory view showing a fixing structure of a shaft body and a clip from the upper surface.
FIG. 4 is a front view showing an appearance in a state where a clip is fixed to a shaft body.
FIG. 5 is a top view showing an appearance of a state in which a clip is fixed to a shaft body.
FIG. 6 is a front view showing an appearance of a shaft body.
FIG. 7 is a top view showing an appearance of a shaft body.
FIG. 8 is a cross-sectional view of a clip.
FIG. 9 is a diagram viewed from the ball side of the clip.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft body 2 Clip 2a Cut part 3 Ball part 4 Base part 5 Engagement protrusion part 5a Step part 5b Inclination part 6 Recess part 7 Clip attachment part 7a Projection part 8 Engagement groove 8a Step part 8b Inclination part 9 Gate part

Claims (3)

In a clip fixing structure for a writing instrument that is engaged with a clip mounting portion provided by projecting the base portion of the rear end of the clip on the outer surface of the resin shaft, the clip is located on the inner side of the base portion. A pair of opposing engaging projections are provided, and a notch is formed in the upper portion of the base toward the front of the clip. The clip mounting portion of the shaft body has a substantially T-shaped cross-sectional shape and is a side portion. clips with the with the engagement groove is formed protruding portion is provided on the upper clip engaging projections in a state engaged with the engaging groove of the shaft, fits into the notch portion protruding part A step portion is formed in front of the engaging protrusion in the axial direction, a step portion is formed in front of the axial end of the shaft body engaging groove in the axial direction, and the front of the step portion is inclined toward the axial center. In a state where the engagement protrusion of the clip is engaged with the engagement groove of the shaft body, Fixing structure of a clip of the writing instrument which stepped portions of the engagement projection is provided so as to engage the stepped portion of the shaft engaging groove. The clip fixing structure for a writing instrument according to claim 1, wherein the cut portion and the projecting portion are formed in a U shape and are fitted to each other . Clip mounting portion has a gate portion projecting for injection molding the top of the protrusion front, inside of the base upper portion of the clip is provided a recess so as not to appropriately interfere with the gate portion according to claim 1 or 2 The fixing structure of the clip of the writing instrument described in 1.

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