JPH0158049B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a molded part of an automobile weather strip such as a glass run, which connects a molded part to the end of an extruded member formed by extrusion molding at the same time as molding. Regarding connection method.

[Prior Art] As shown in FIG. 1, a glass run 1 is assembled into a window frame of a door 2 and used. However, the corners of the window frame form appropriate angles such as right angles, and if a straight extruded glass run is bent and used as it is, the shape of the glass run will be abnormally deformed at the bent part, making it difficult to assemble into the window frame of the lead door. This is undesirable because it causes such defects, and in order to eliminate these defects, it is necessary to form it with corner portions in advance. In order to form this corner part, the corner part is formed separately and a straight glass run is connected, or a part of the straight glass run is cut out and bent. However, when a part of the glass run is cut out and bent, there is a problem that water gets wet from the cutout part. For this reason, many connection methods have been used to form the corner portions. Conventionally, this connection method involves connecting the straight parts 4 and 5 of the two glass runs to be connected as shown in Figure 2.
is set in a mold, this mold is provided with a cavity in which the corner portion 3 can be formed, and the cavity is filled with the same type of rubber or plastic base material as the straight portions 4 and 5 of the glass run, such as EPDM, soft vinyl chloride, etc. In the case of EPDM, the straight parts 4 and 5 and the corner part 3 were vulcanized and bonded at the same time as the corner part 3 was formed, and in the case of soft vinyl chloride, they were welded by heat.

[Problem to be solved]

However, the corner portion of the glass run is subject to strong tension because the straight portion is pulled vertically when the glass of the door slides. Therefore, a strong adhesive force is required to bond the corner part and the straight part, but the bonding surfaces between the straight parts 4 and 5 and the corner part 3 are linear, and the bonding area is small and the adhesive force is not sufficient. Ta. Therefore, there was a problem that the straight portions 4, 5 and the corner portion 3 were separated from each other.
Furthermore, in general automotive weather strips, both ends of the joint surface are usually fixed, and in this case, tension due to shrinkage of the rubber or plastic material over time acts on the joint surface, so the above-mentioned problem occurs. I had a similar problem.

[Means to solve]

In order to solve the above-mentioned problems, the present invention includes inserting an end face of an extrusion-molded member made of rubber or plastic material so as to have a wall portion into the mold so as to face the cavity of the mold; Inject rubber or plastic material into the cavity.
In a method for connecting a molded part of an automobile weather strip, which solidifies and molds a molded part having substantially the same cross-sectional shape as the extruded member, and connects the molded part and the extruded member, the method comprises: A cut consisting of a recess that penetrates the wall portion in the thickness direction at an end portion, and a neck portion that penetrates the wall portion in the thickness direction and that communicates the recess portion with the end surface of the extrusion molded member and is narrower in width than the recess portion. In addition to providing a notch, a protrusion having approximately the same thickness as the wall is formed in the notch when rubber or plastic material is injected.

[Action/Effect]

In the automobile weather strip obtained according to the present invention, the protrusion of the molded part adheres closely to the notch of the extruded member, providing an anchoring effect, increasing the bonding area, and exhibiting extremely high adhesive strength. Therefore, even if tension is applied to the joint surface due to sliding of the glass or shrinkage of the rubber or plastic material over time, the extruded member and the molded part will not separate.

[Special effects]

In addition, as a means to increase the adhesive strength, only a recess is provided without providing a neck in the extrusion molded member, so that a part of the extrusion molded member and the molded part overlap in the wall thickness direction, and through the overlapping part, Although a method of filling the recess with rubber or plastic material may be considered (see Japanese Patent Publication No. 45-10233 and Japanese Unexamined Patent Publication No. 119063/1983), in the case of automotive weather strips, the molded part and the extruded member are Unless the elastic force is changed as uniformly and as smoothly as possible, the sealing performance of the connection will deteriorate, so it is not desirable to have a partially overlapping structure like this. .

In addition, especially for glass runs, it is virtually impossible to adopt the multi-layered structure described above due to factors such as the consistency of the shape of the window frame groove and the outside shape of the glass run, and the need to secure an entrance path for the glass. .

On the other hand, in the present invention, the adhesive force can be increased without forming such a multilayer structure, and the sealing performance does not deteriorate.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings using a grass run as an example.

The glass run is manufactured as follows.

First, a rubber or plastic material is extruded into the cross-sectional shape shown in FIG. 4, and then cut into a predetermined length to produce the straight parts 41, 51. As the rubber, for example, EPDM, chloroprene rubber, SBR, etc. can be used, and as the synthetic resin, for example, soft vinyl chloride, soft polyethylene, thermoplastic polyurethane, etc. can be used.
EVA etc. can be used.

The glass sliding surfaces of the straight portions 41, 51 are coated with short fibers, silicone oil, etc. to reduce sliding resistance, if necessary.

Next, a notch portion 42 is provided in the longitudinal direction from approximately the center of the end surface 34 of the bottom wall portion 40 of the straight portions 41, 51. The notch has a strip-shaped neck 35 opening in the end surface 34 and having a length of 3 to 5 mm and a width of 3 to 5 mm, and the tip becomes a wide recess 36 through the neck 35. The recess is circular, circular, rectangular,
The shape may be a triangle or the like. Further, the notch portion can be formed at the same time as cutting the extrudate into the required size. Moreover, it can be manufactured by cutting out a part of the straight part and bending it. The straight parts 41, 51 of this glass run are set in the mold 6 as shown in FIG. The mold 6 has a cavity 61 which is a space in which the corner portion 31 can be formed. Straight part 4
The end faces 34 of 1 and 51 are arranged facing the cavity 61.

Plasticized rubber or plastic material is injected into this cavity 61 through an injection port 62. When the injected rubber or synthetic resin is filled into the cavity 61, it flows to the end faces 34 of the straight parts 41, 51 located on the sides of the cavity, further enters the notches 42, 52, and hardens. Joint surface of straight parts 41, 51 and notch part 4
The rubber or synthetic resin injected into the side surfaces of 2 and 52 and the cavity can be bonded by vulcanization adhesion for rubber when it hardens from a molten state, and by welding for synthetic resin. The cutout portions are in close contact with the protrusions 32 and 33 formed in the cutout portions 42 and 52, and an anchoring effect can be obtained, and furthermore, since the bonding area is increased, the bonding force is extremely high. To obtain even greater adhesion, an adhesive can be applied to the joining surfaces.

In addition, the notch part is the side wall part 401 of the glass run.
may be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing how a glass run is attached to an automobile door. FIG. 2 is a perspective view showing a corner portion of a conventional grass run. FIG. 3 is a perspective view showing a corner portion of the glass run obtained by the present invention. Fourth
The figure is a sectional view showing the extruded shape of the straight part of the glass run shown in FIG. 3. Figure 5 is an enlarged side view of Figure 3.
FIG. 6 is a model diagram showing a state in which the material is placed in a mold and the corner portions are connected. 31... Corner part (mold forming part) 32, 33... Projection, 34... End face, 35... Neck, 36... Recess, 4
1, 51... Straight part (extrusion molded member), 42,
52... Notch part, 40... Bottom wall part, 6... Molding mold,
61... Cavity.

Claims (1)

[Scope of Claims] 1. An end face of an extruded member formed by extrusion molding from a rubber or plastic material to have a wall portion,
The material is inserted into the mold while facing the cavity of the mold, and a rubber or plastic material is injected into the cavity and solidified to form a molded part having almost the same cross-sectional shape as the extrusion molded part. In the method for connecting a molded part of an automobile weather strip to the extrusion molded member, a recess is provided at an end of the extrusion molded member and penetrates through the wall in the thickness direction, and the recess and the end surface of the extrusion molded member are connected to each other. A notch is provided that penetrates the wall in the thickness direction and has a neck narrower than the recess, and when injecting the rubber or plastic material, the cutout has a thickness that is approximately the same as that of the wall. A method for connecting a molded part of an automobile weather strip, characterized in that a thick protrusion is molded.