JPH09175181A - Hollow weather strip provided with triangular center core punching hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve separability of a center core without decreasing rigidity in the end part of a hollow Weather strip provided with a punching hole of the center core. SOLUTION: A weather strip 50 has a punching hole 55 of a center core for forming a hollow hole 63 of an end part 62. The punching hole 55 is formed in a triangular shape spread toward the end of the weather strip in an internal surface of the end part 62. Since the punching hole 55 is formed in a triangular shape, an undercut of the end part 62 is decreased in accordance with approaching the end of the weather strip, the center core can be easily extracted from the punching hole. A thickness in an upper part of the end part 62 is thickened in accordance with approaching the end, so as to prevent rigidity from decreasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of hollow weather strips attached to the windows of automobile doors.

[0002]

BACKGROUND OF THE INVENTION Weather strips are automotive parts that are affixed to door panels or door trims. The weather strip is elastically brought into contact with a window glass or the like, and is formed in a hollow shape as shown in FIGS. 5 and 6 so as to exert a sealing effect.

The hollow weather strip 20 is obtained by continuously molding the intermediate portion 21 having a constant cross-section into a hollow shape by extrusion molding, cutting the elongated intermediate portion 21 into a predetermined size, and cutting the cut intermediate portion. It is manufactured through a process of joining hollow end portions 23 to both ends of 21 by injection molding. The line indicated by reference numeral 24 is the joining portion between the intermediate portion 21 and the terminal portion 23. At the end of the intermediate portion 21, the terminal portion 23
A slit-shaped removal hole 25 for removing the core 31 (see FIG. 7) for forming the hollow hole 22 is provided.

The punched hole 25 is a mold 30 having a core 31.
Is formed by the punched hole forming part 32. The thickness dimension of the punched hole forming portion 32 is set smaller than the vertical dimension of the core 31. When the center core 31 is pulled out, it is moved from the hollow hole 22 of the terminal portion 23 to the hollow hole 27 of the intermediate portion 21 and is pulled out while expanding the pulling hole 25. At this time, a part of the upper portion of the intermediate portion 21 is projected outward as shown by a virtual line in FIG. Often, the protruding portion 26 does not completely return to its original state, but remains slightly protruding. The "upper part" of the weather strip refers to a part that is on the upper side when the weather strip is attached to the vehicle body. Similarly, the term “bottom” of the hollow hole is based on the condition that the weather strip is attached to the vehicle body.

The protruding portion 26, as shown in FIG.
When the hollow weather strip 20 is attached to the door D, the hollow weather strip 20 protrudes from the edge of the window of the door D and impairs the aesthetic appeal of the vehicle. Further, when the punched hole 25 is formed in the intermediate portion 21, the rigidity of the intermediate portion 21 decreases, and when the window glass comes into contact with the intermediate portion 21 and rises, the intermediate portion 21 is slightly pulled by the rising window glass. May be projected outward. Even in this case, the protruding portion impairs the aesthetic appeal of the vehicle.

Therefore, as a method of coping with such a problem, as shown in FIG. 9, a method of extracting the center core from a hole 47 provided in the inner surface of the terminal portion 43 can be considered.
The upper and lower edges 48, 49 of the punched hole 47 are parallel to the longitudinal direction of the intermediate portion 41, and the punched hole 47 has a rectangular shape. The "inner surface" of the weather strip is a surface located inside the vehicle when the weather strip is attached to the vehicle body.

[0007]

By the way, the upper edge 48 and the lower edge 49 of the hole 47 of the hollow weatherstrip 40.
The wider the space between and, the easier it is to pull out the core. However, if the distance between the upper edge and the lower edge is excessively widened, the rigidity of the terminal portion decreases, and the window glass comes into contact with the terminal portion 43 and rises. It has a problem that it can be deformed as shown.

On the contrary, if the distance between the upper edge and the lower edge is narrowed, it is difficult to remove the center core, which causes another problem.

[0009]

According to the present invention, there is provided a hollow weather strip having a hollow core hole for forming a hollow hole in a terminal portion, the hollow hole being formed on the inner surface of the terminal portion by the hollow shape. The above problem is solved by the hollow weather strip, which is characterized in that it is formed in a triangular shape that widens toward the end of the weather strip.

[0010]

In the hollow weather strip of the present invention, as in the prior art, the intermediate portion having a constant cross-sectional shape is continuously formed into a hollow shape by extrusion molding, and then this long intermediate portion is cut into a predetermined size, and the cutting is performed. It is manufactured through a process of joining terminal parts to both ends of the formed intermediate part by injection molding. Hollow holes and holes are formed in the terminal portion by a mold. The mold integrally includes a core for forming a hollow hole and a hole forming portion for forming a hole.

The punched hole is formed in a triangular shape that widens toward the end of the weather strip. For this reason, the undercut of the end portion is reduced as the end portion approaches the end of the weather strip, and the core is easily extracted from the extraction hole.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
It will be described with reference to FIG. The hollow weather strip 50 (see FIG. 1) of the present invention is an elongated automobile component attached to a window frame of an automobile door. The hollow weather strip 50 is composed of an intermediate portion 61 and terminal portions 62 connected to both ends of the intermediate portion 61 (the terminal portions at the left ends are omitted). The inner surface is opposite to the door. Lips 52, 53, 54, which are mounting portions, are integrally provided.

A hollow hole 51 is formed in the intermediate portion 61. In the terminal portion 62, a hollow hole 63 and a hollow hole 55 for extracting the core are formed so as to communicate with each other. Hole 5
5 is formed on the inner surface of the hollow weather strip 50 in the shape of a substantially right triangle that spreads toward the end of the hollow weather strip 50.

One side (bottom side) of the triangular hole 55 is
It extends parallel to the longitudinal direction and is flush with the bottom 65 of the hollow hole 63. The width of the hole 55 is as shown in FIG.
As shown by W1, W2, and W3 in (B) and (C), the width becomes wider as the hollow weather strip 50 approaches the end.

As described above, since the punched hole 55 is formed in a triangular shape that widens toward the end of the weather strip 50, the undercut of the end portion 62 decreases as it approaches the end of the weather strip 50. The core 58 is easily extracted from the extraction hole 55.

The thickness of the upper portion 56 of the portion where the hollow hole 63 is formed is T1 in FIGS. 3 (A), 3 (B) and 3 (C),
As shown by T2 and T3, the hollow weather strip 5
It gets thicker as it approaches 0 terminal. Terminal unit 62
Since the thickness of the upper portion 56 is thick, the periphery where the punched hole 55 is formed is reinforced, and the reduction in rigidity due to the provision of the punched hole 55 is prevented.

In the hollow weather strip 50, an intermediate portion 61 having a constant cross-sectional shape is continuously formed into a hollow shape by extrusion molding, and then this elongated intermediate portion 61 is cut to a predetermined size, and the cut intermediate portion is cut. It is manufactured through a process of joining the terminal portions 62 to both ends of 61 by injection molding. A line indicated by reference numeral 64 is a joint portion between the intermediate portion 61 and the terminal portion 62.

The hollow hole 63 and the vent hole 55 of the terminal portion 62 are
It is formed by the mold 57 (see FIG. 4). Mold 57
Has a core 58 for forming the hollow hole 63 and a hole forming portion 59 for forming the hole 55. By making one side of the punched hole flush with the bottom 65 of the hollow hole 63 to reduce the undercut in the terminal portion 62, the center core 58
Are easily extracted from the extraction hole 55 along the bottom 65 of the hollow hole 63. That is, the mold release property of the die 57 is improved.

[0019]

According to the hollow weather strip of the first aspect of the present invention, since the hole is formed in a triangular shape, the undercut of the end portion becomes smaller as it approaches the end of the weather strip. There is an effect that it is easy to pull out and the detachability of the mold can be improved.

When one side of the triangular hole is flush with the bottom of the hollow hole as in the hollow weather strip of claim 2, the ease of removing the core and the releasability of the mold are further improved. be able to.

As in the hollow weather strip of claim 3, when the upper wall thickness of the end portion is made thicker as it approaches the end portion, the periphery where the punched hole is formed is reinforced and rigidity due to the punched hole is provided. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a terminal portion of a hollow weather strip according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3A is a sectional view taken along the line AA of FIG. 1, FIG. 3B is a sectional view taken along the line BB of FIG. 1, and FIG. 3C is a sectional view taken along the line CC of FIG.

FIG. 4 is a perspective view of a mold.

FIG. 5 is a front view of a terminal portion of a conventional hollow weather strip.

6 is a left side view of FIG.

FIG. 7 is a side view of the center core.

FIG. 8 is a cross-sectional view of a terminal portion of a hollow weatherstrip attached to a window frame of a door.

FIG. 9 is a front view of another conventional hollow weatherstrip.

[Explanation of symbols]

50 Hollow weather strip 55 Holes 56 Upper part where hollow holes are formed 57 Middle core 62 Terminal part 63 Hollow hole 65 Bottom of hollow holes T1, T2, T3 Thickness of upper part of terminal part

Claims (3)

[Claims] 1. A hollow weather strip having a hollow core hole for forming a hollow hole at an end portion,
The hollow weather strip, characterized in that the hole is formed in a triangular shape on the inner surface of the terminal portion and widens toward the end of the hollow weather strip. 2. The hollow weather strip according to claim 1, wherein one side of the triangle is flush with the bottom of the hollow hole. 3. The hollow weatherstrip according to claim 1 or 2, wherein a thickness of an upper portion of the end portion is increased as the end portion approaches the end.