JP2590974Y2 - Holding pin for insert core material when molding resin products - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin for holding an insert core material integrated with a resin product at the time of molding the resin product, and more particularly to a technique for improving the appearance of a molded resin product.

[0002]

2. Description of the Related Art In a vehicle, a door glass protector is provided along an uppermost edge of a door glass provided on a door so as to be vertically movable. This door glass protector is made of polyethylene, polypropylene (P
P), a resin molded product such as ABS resin, which is molded by an injection molding method.

In such a door glass protector, a metal insert core is integrated with the door glass protector at the time of injection molding. In recent years, in order to reduce the weight of the door glass protector, the resin is made hard and the insert core material is formed relatively thin. When such a relatively thin insert core material is integrated with the resin portion during injection molding, the insert core material may run out, and the insert core material may not be properly disposed. The insert pin holding pin is set in the mold to reduce runout of the insert core.

[0004]

By the way, in the case where the above-mentioned holding pin for insert core material is used, a through-hole for the holding pin is usually formed in the molded door glass protector. Since the tip of the conventional insert core holding pin has a rod shape with a uniform circular cross section, the surface of the core is exposed from the relatively large pin insertion hole that appears at the joint between the resin part and the insert core. Especially, since the resin is black and the insert core material is metal color, the insert core material stands out, and the appearance is very poor when the door glass protector is viewed from the outside of the door glass. there were.

In view of the above, the present invention has been made in view of the above, and the appearance of a resin product is degraded while reliably suppressing the deflection of an insert core material integrated with the resin product at the time of molding the resin product. It is an object of the present invention to provide a press pin for an insert core material that does not have any problem.

[0006]

[SUMMARY OF To this end, the present invention is, trees
Set in the mold at the time of molding the fat product with the mold
Integrated at the approximate center of the resin product
In order to suppress the run-out of the core material, a substantially central position in the molding die
A pin having a distal end portion protruding therethrough and holding the insert core material is provided, and the distal end portion is provided with a projecting portion whose cross-sectional shape gradually becomes smaller toward the distal end.

[0007]

[Function] When molding a resin product containing an insert core,
In order to suppress run-out of the insert core material set in a mold such as an injection mold , a substantially central portion in the mold is provided.
The tip of the insert is pushed into place and holds the insert core material
A pin insertion hole that appears at the seam between the resin part and the insert core material inside the mold after the resin product is completed, by providing a projection at the tip of the pin that gradually becomes smaller in cross section as it goes to the tip. The surface portion of the insert core material, which can be seen from above, becomes substantially dot-shaped and can be reduced, resulting in improved appearance.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1A shows a door glass protector as a resin product to which one embodiment of the present invention is applied, and FIG. 1B shows a cross-sectional view thereof. In this figure,
The door glass protector 1 is formed by injection molding of polyethylene, polypropylene (PP), ABS resin, or the like, and the metal insert core 2 is integrated during the injection molding as in the conventional case.

Here, a door glass protector, which is a resin product, is used.
The molding is performed at the time of molding with the injection mold of the
It is set in the mold and the inside of the door glass protector 1
Suppress the run-out of the insert core material 2 integrated at the center
Therefore, a substantially central position in the molding die, that is,
The tip of the insert core is pushed into the approximate center position.
A holding pin 4 for holding the material 2 is provided. The holding pins 4 are formed, for example, in the shape of a round bar having a diameter of about 3 mm from two places where the holding body 5 is separated from each other, and each holding pin 4 has a leading end, as shown in FIG. Accordingly, a projection 4A whose cross-sectional shape gradually becomes smaller is formed. In this case, the projection 4A is formed in a substantially conical shape.

[0010] According to this configuration, the insert core 2 is included, that is, the insert core 2 is located at substantially the center portion thereof.
At the time of molding of the door glass protector 1 to be integrated into, Lee
At the approximate center of the injection mold, that is, the resin part
3. The tip is pushed into the approximate center of 3
By providing a projection 4A whose cross-sectional shape gradually becomes smaller toward the tip at the tip end of the holding pin 4 for preventing the set insert core material 2 from swaying , the resin part 3 is formed after the resin product is completed. Since the surface portion of the core 2 seen from the pin insertion hole 3a appearing at the joint with the insert core 2 is reduced to be substantially dot-shaped, the resin is black and the insert core 2
Is a metallic color, the insert core material 2 is not noticeable, and when the door glass protector 1 is viewed from the outside of the door glass, the appearance is good.

In the above embodiment, the holding pin 4 is formed in a round bar shape. However, as shown in FIG. 3, it may be formed in a square bar shape. In this case, the projection 4A is formed in a substantially triangular prism shape. Is done. As described above, the present invention has been described with reference to the specific embodiments. However, the present invention is not limited to the embodiments, and may be implemented by a person skilled in the technical field attached to the present invention. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0012]

[Effects of the Invention] As described above, the present invention sets the resin product in the molding die when the resin product is molded by the molding die.
Of insert core material that is integrated at the approximate center of
In order to reduce run-out, move the tip
At the tip of the pin whose end is pushed in and presses the insert core material, a projection having a gradually decreasing cross-sectional shape as it goes to the tip is provided, so that it is integrated with the resin product during molding of the resin product. While the deflection of the insert core material to be formed is reliably suppressed, the practical effect of the present invention is large without deteriorating the appearance of the resin product.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a door glass protector to which a press pin for an insert core material is applied at the time of molding a resin product according to the present invention, wherein (A) is a front view, and (B) is an AA of (A).
Arrow cross section

FIG. 2 is a perspective view showing a tip end portion of a pressing pin for an insert core material in the embodiment.

FIG. 3 is a perspective view of another embodiment.

[Description of Signs] 1 Door glass protector 2 Insert core material 3 Resin part 4 Holding pin 4A Projection part

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ identification code FI B29L 31:30 (58) Investigated field (Int.Cl. ⁶ , DB name) B29C 45/00-45/84 B29C 33/00 -33/76

Claims (1)

(57) [Scope of request for utility model registration] 1. The method of molding a resin product in a molding process using a molding die.
It is set in the mold and integrated at the approximate center of the resin product
In order to suppress run-out of the insert core material
A pin having a tip portion protruding to a substantially central portion of the inside and pressing the insert core material, wherein the tip portion is provided with a projection having a gradually decreasing cross-sectional shape toward the tip. A press pin for an insert core material when molding a resin product.