JPS61246020A - Connection of moldings of automotive weather strip - Google Patents

Abstract

PURPOSE:To obtain an anchoring effect, by setting a cut notch constituted of a cavity penetrating a wall part at an end of an extruded molding to the direction of the thickness and a neck part penetrating both the cavity and the end of the extruded molding and whose width is narrower than that of the cavity and by forming a projection at the cavity whose thickness is almost the same as that of the wall part when rubbery or plastic material is poured. CONSTITUTION:After a rubbery or plastic material is molded by extrusion molding, the molding is cut to prepare a straight parts 41, 51, from the almost center part of whose bottom wall 40 a cut notch 42 is then prepared to the longitudinal direction. These straight parts 41, 51 is then set in a metal mold 6, which has a cavity 61 forming a corner part 31 and a plasticized rubbery or plastic material is poured from the supplying nozzle 62 to this cavity 61. The rubbery or plastic material being poured is filled in the cavity 61, flows to the end surface 34 of the straight parts 41, 51, then penetrates into cut notches 42, 52 and finally solidified there.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the molding of automotive weather strips such as 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 the connection method.

[Prior Art] As shown in FIG. 1, a glass run I 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 is, the shape of the glass run will deform abnormally at the bend, making it difficult to assemble to the door window frame. This is undesirable because it causes defects such as, and in order to eliminate these defects, it is necessary to form it in advance to have corner portions. 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 cut out part. For this reason, many connection methods have been used to form the corner portions.

Conventionally, this connection method is based on two connections that should be made as shown in Figure 2.
The straight part 4.5 of the wooden glass run is set in a mold, a cavity in which the corner part 3 can be formed is provided in the mold, and the same type of rubber or plastic base as the straight part 4.5 of the glass run is placed in the cavity. Material 9 For example, E
PDM, soft vinyl chloride, etc. is injected, and in the case of EPDM, it is vulcanized, and at the same time the corner part 3 is formed, the straight part 4.5 and the corner part 3 are vulcanized and bonded, and in the case of soft vinyl chloride, It was heat welded.

[Problem to be solved] However, when the door glass slides, the straight part of the glass run is pulled in the vertical direction, so strong tension is exerted on the corner part of the glass run.For this reason, strong adhesive is required to bond the corner part and the straight part. Although force was required, the bonding surface between the straight part 4.5 and the corner part 3 was linear and the bonding area was small, so the bonding force was not sufficient. Therefore, the straight part 4
, 5 and the corner portion 3 are separated from each other.

Furthermore, in general automotive weather strips,
Both ends of the joint surface are usually used fixedly, and in this case, tension due to the aging contraction of the rubber or plastic material acts on the joint surface, resulting in the same problem as described above.

[Means for Solving] In order to solve the above-mentioned problems, the present invention provides an extrusion-molded member formed by extrusion molding from a rubber or plastic material so as to have a wall portion, so that the end face thereof faces the cavity of a mold. Insert into a mold, inject rubber or plastic material into the cavity and solidify to form a molded part having approximately the same cross-sectional shape as the extruded member, and connect the molded part and the extruded member. A method for connecting a molded part of a weather strip for an automobile includes: a recess that penetrates the wall in the thickness direction at an end of the extruded member; and a wall that communicates the recess with the end surface of the extruded member. A notch is provided that penetrates in the thickness direction and has a neck narrower in width than the recess, and when the rubber or plastic material is injected, a protrusion having approximately the same thickness as the wall is formed in the notch. This method was adopted.

[Effect effect] In the automobile weatherstrip obtained according to the present invention, the protrusion of the molded part is in close contact with the notch of the extrusion molded member, and an anchoring effect can be obtained, and the adhesion area can be increased.
The adhesive force is extremely strong, so even if tension is applied to the 1wc mating surface due to sliding of glass or shrinkage of rubber or plastic material over time, the extruded member and molded part will not separate.

[Special Effects] As a means of increasing adhesive strength, only a recess is provided without providing a neck in the extruded member, so that the extruded member and a part of the molded part overlap in the wall thickness direction, A method of filling the concave portion with rubber or plastic material through the layered portion may also be considered (Japanese Patent Publication No. 45-102).
Publication No. 33.

(Refer to Japanese Unexamined Patent Publication No. 50-119063), in automotive weather strips, the elastic force between the molded part and the extrusion molded member must be changed as uniformly or as smoothly as possible to prevent connection. It is undesirable to have such a partially overlapping structure because it will reduce the sealing performance of the parts.

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, an example 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.
．． 51 will be produced. Examples of rubber include E PDM
, chloroprene rubber, SBR, etc. can be used, and as the synthetic resin, for example, soft vinyl chloride, soft polyethylene, thermoplastic polyurethane, EVA, etc. can be used.

The glass sliding surface of the straight portion 41.51 is coated with short m1ia hair flocking, silicone oil coating, 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 this straight portion 41.51. The notch is opened in the end surface 34 in the longitudinal direction 3 to 51.
One neck part 35 has a rectangular neck part 35 with a width of 3 to 5 mm.
The tip becomes a wide recess 36 through the hole. The recess is circular;
The shape may be circular, rectangular, triangular, etc., and the notch 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 portions 41, 51 of this glass run are set in the mold 6 as shown in FIG. 75. This mold 6 has a cavity 61 which is a space in which the corner portion 31 can be formed. The end faces 34 of the straight parts 41, 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 face 34 of the straight part 41.51 located on the side of the cavity, and further enters the notch part 42.52.
harden. The rubber or synthetic resin injected into the joining surface of the straight part 41.51 and the side surface of the cutout part 42.52 and the cavity can be bonded by vulcanization adhesion for rubber and welding for synthetic resin when hardening from a molten state. can.

The notch comes into close contact with the protrusion 32.33 formed in the notch 42.52, creating an anchoring effect, and since the adhesive area increases, the adhesive force is extremely large. The adhesive can be applied to the joint surface.The notch is located on the side wall 401 of the glass run.
may be provided.

[Brief explanation of the drawing]

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 according to the present invention; FIG. 4 is a sectional view showing the extruded shape of the straight portion of the glass run shown in FIG. 3; FIG. 5 is an enlarged side view of FIG. 3. FIG. 6 is a model diagram showing the state in which the mold is placed in a mold and the corner portions are connected. 31... Corner part (mold forming part) 32.33... Projection part 34... End face 35...
・Neck part 36... Concave part 41, 51... Straight part (extrusion molded member) 42.52 Notch part
40... Bottom wall part 6... Molding mold 61... Cavity Patent applicant Toyoda Gosei Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] The end face of an extruded member formed by extrusion molding from a rubber or plastic material to have a wall portion is inserted into the mold so as to face the cavity of the mold, and the rubber or plastic material is injected into the cavity and solidified, and the extrusion is performed. In a method for connecting a molded part of an automobile weather strip, which molds a molded part having substantially the same cross-sectional shape as a molded member and connects the molded part and the extrusion molded member,
A recess that penetrates the wall in the thickness direction at the end of the extrusion molded member, and a recess that penetrates the wall in the thickness direction that communicates the recess and the end surface of the extrusion molded member and is narrower in width than the recess. In addition to providing a notch consisting of a neck,
A method for connecting a molded part of a weather strip for an automobile, characterized in that, when injecting a rubber or plastic material, a protrusion having approximately the same thickness as the wall part is molded in the notch part.