JP2713042B2 - Method of forming weather strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a weather strip used in an automobile.

[0002]

2. Description of the Related Art A rubber weather strip for sealing an outer periphery of a member for opening and closing an opening is mounted around an opening of an automobile body.

Taking the sunroof of an automobile shown in FIG. 6 as an example, as shown in FIG. 7 , around an opening of the roof 1, a sealing portion 42 connected to a side surface of a mounting base 41 by a neck-like root portion 44 is provided. And a seal between the outer periphery of the sunroof 2 and the opening of the roof 1 when the sunroof 2 is closed. In addition, another sealing portion 43 abutting on the lower surface of the sunroof 2 is provided on the top end of the mounting base 41.
Are formed, and the mounting base 41 has an insert 4
7 are buried.

However, since it is difficult to extrude the weather strip 4 into the sectional shape as it is, as shown in FIG. 8, the mounting base 41 is formed into a flat plate shape and the sealing portion 43 is formed in the extrusion step. In order to avoid interference, the seal portion 42 is extruded in a shape in which the seal portion 42 is inclined about the base portion 44 as a bending center, and after vulcanization, the mounting base 41 is bent into a U-shape. At the time of installation on the roof, FIG.
As shown in (2), when the seal portion 42 is pressed against the roof 1, the root portion 44 is bent and deformed to change the posture.

[0005]

However, the root portion 44
Does this hardly bent during When thick weather strip assembly, forcibly bend the whole seal portion 42 is irregularly deformed by the sealing property is lowered.

On the other hand, if the root portion 44 is made thinner, the root portion 44 is bent in the process of being conveyed to the vulcanization step after the weather strip is extruded, and the seal portion 42 is bent as shown in FIG.
Hangs greatly in the direction of arrow C, and is vulcanized in a completely different posture from the intended posture. When assembled in this position, the seal portion 42 is also disadvantageously deformed. In addition, the sealing portion 4
There is also a problem that the side surface 2 and the mounting base 41 are contact-coupled. As described above, it is extremely difficult to achieve both the deformability at the time of assembling the root portion 44 and the shape retention after extrusion.

[0007] Accordingly, the present invention provides a seat connected to a mounting base.
It is an object of the present invention to provide a method of forming a weatherstrip in which a base portion of a screw portion is made thin so that it is easy to assemble and the shape retention of the base portion during molding is ensured.

[0008]

The present invention comprises a mounting base and a seal extending from the mounting base.
As shown in FIG. 2 (A), in the weather strip in which the extruded portion is extruded in a posture in which the sealing portion is inclined with respect to the mounting base, the tip of the sealing portion 52 extends from the inclined side surface of the mounting portion 5.
2 is characterized in that a weather strip from which a protrusion 56 proximate to 1 protrudes is extruded, and after the extrusion, the seal portion 52 is supported by the protrusion 56 as shown in FIG.

[0009]

The sealing portion 52 is supported by the projection 56 even when the root portion 54 is made thin, so that an undesired sagging does not occur. The tip of the projection 56 is in contact with and joined to the mounting base 51, but can be easily torn and separated after vulcanization.

[0010]

FIG. 2 (A) shows the cross-sectional shape of the sunroof weather strip shown in FIG. 1 in the extrusion step, and FIG. 2 (B) shows the cross-sectional shape of the weather strip immediately after extrusion.

[0011] As shown in FIG. 2 (A), the mounting base 51 of the weather strip 5 which is extruded by an extruder at a cross section which is expanded in a flat plate shape, the insert 57 is extruded integrally. A hollow sealing portion 53 having a substantially circular cross section protrudes from the center in the width direction of one surface of the mounting base 51, and a hollow sealing portion 52 having a substantially triangular cross section is connected to one end in the width direction by a neck-shaped root portion 54. doing. The base 54 is the mounting base 5
1, and the seal portion 52 is attached to the mounting base 5.
It is in a posture that has fallen to one side. Seal lips 57 and 58 project from the side surface of the seal portion 52 on the falling side. A projection 56, which is a feature of the present invention, projects from the vicinity of the base 54 inside the seal lip 58. Protrusion 5
Numeral 6 has a substantially triangular cross section, and a pointed tip is closely opposed to one end of the mounting base 51.

The weather strip 5 has a sealing portion 52,
53 is made of sponge rubber, and the other parts are made of solid rubber. However, the unvulcanized root portion 54 immediately after the extrusion is flexible, and the seal portion 52 tries to further fall around the root portion 54 as a bending center, but as shown in FIG. Abuts against and is supported by the mounting base 51. Thereafter, the weather strip 5 is fed to a vulcanization tank and vulcanized by a well-known method, and then fed to a bending machine, where the mounting base 51 is bent into a U-shape and cut into a predetermined length. . The obtained weather strip 5 has the tip of the projection 56 joined to the mounting base 51, but is separated by tearing or tearing. The joints have a very small area
, They are easily separated.

FIG. 1 shows a state in which the weather strip 5 obtained as described above is attached to a roof opening for a sunroof. The periphery of the opening of the automobile roof 1 has a stepped cross-sectional shape, and an upstanding flange 11 is formed at the opening edge. When the mounting base 51 of the weather strip 5 is pressed into the flange 11, the seal lips 57 and 58 are pressed against the horizontal portion 12 of the roof 1, and the outer surface of the seal portion 52 is pressed by the vertical portion 13, so that the root is formed. Part 5
4 is deformed into a shape that stands vertically from the side surface of the mounting base 51. When the sunroof 2 is closed, the tip of the seal portion 52 is sandwiched between the roof 1 and the sunroof 2, and the seal portion 5 is closed.
3 is in contact with the lower surface of the sunroof 2 to form a double seal.

According to the molding method of the present invention,
After the weather strip is extruded, the seal portion 52 is supported by the projection 56, so that the root portion 54 can be made thin. When the weatherstrip is assembled, the sealing portion 52 can be easily set in the mounting posture by bending the thinned base portion 54.

The present invention can be applied not only to the sunroof weather strip 5 but also to other weather strips.

FIG . 3 shows the door opening along the roof side of the automobile .
FIG . 4 is a cross-sectional view of the weather strip 6 attached to the rim .
Is a cross-sectional view of the weather strip 6 immediately after being extruded in the extrusion step. The weather strip 6 is connected to a mounting base 61 having a U-shaped cross section to be mounted on a flange 31 formed along the roof side 3, and is connected to a side surface of the mounting base 61 in a neck shape by a root portion 64. A hollow seal portion 62 to be pressed; and an inner seal lip 6 extending from the mounting base portion 61 and elastically contacting the inner surface of the door glass 8.
3 is provided.

The weather strip 6 is, as shown in FIG.
The mounting base 61 in which the insert 67 is embedded is developed into a flat plate shape, and the sealing portion 62 is extruded in a shape inclining in a direction to avoid interference with the inner seal lip 63. Seal part 6
2, a protrusion 66 is formed at a position facing the end of the mounting base 61, and after the extrusion, the seal portion 62 is
With this configuration, it is supported by the mounting base 61, and the same operation and effect as those of the previous embodiment can be obtained.

In each of the above embodiments, the hollow seal portion is prevented from sagging after the weather strip is extruded. However, the present invention can also be applied to the lip-shaped seal portion from sagging. .

FIG. 5 shows a cross section of a main part of a weather strip 7 having a lip-shaped seal part 72 extending from a mounting base 71 after the extrusion, and the seal part 72 has a root part 7.
4, is supported by the mounting base 71 by the projection 76,
The seal portion 72 is prevented from dropping down.

[0020]

According to the present invention, in the process of forming a weatherstrip, the seal portion sags around the root of the seal portion and the contact connection between the side surface of the seal portion and the mounting base caused by the sag. Is prevented, so that the seal portion is installed in a predetermined posture when the weather strip is assembled.
The base part can be formed thinly so as to be easily bent. As described above, according to the present invention, it is possible to achieve both the shape preserving property of the seal portion when forming the weather strip and the deformability of the seal portion when assembling the weather strip.

[Brief description of the drawings]

FIG. 1 is an assembled sectional view of a sunroof weather strip obtained according to the present invention at a position along the line AA in FIG. 6;

2 (A) is a cross-sectional view of the weather strip of FIG. 1 in an extrusion step, and FIG. 2 (B) is a cross-sectional view immediately after extrusion.

FIG. 3 is an assembled sectional view of the weather strip for door opening obtained by the present invention at a position along the line BB in FIG. 6 ;

4 is a sectional view of the weather strip of FIG. 3 immediately after extrusion.

FIG. 5 is a cross-sectional view of a main part immediately after extrusion of still another weather strip according to the present invention.

FIG. 6 is a perspective view of an automobile.

FIG. 7 shows a conventional sunroof weather strip.
FIG. 3 is a cross-sectional view taken along a line AA of FIG.

8 is a cross-sectional view of the weather strip of FIG. 7 during extrusion molding.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 31:30

Claims (1)

(57) [Claims] 1. A weather strip having a hollow or lip-shaped seal portion extending from a mounting base, and extruding the seal portion in a posture inclined with respect to the mounting base in an extrusion step.
A weather strip that changes the posture of the seal portion around the root portion of the seal portion at the time of assembling and has a protrusion that protrudes from the side surface on the tilting side of the seal portion and whose tip is close to the mounting base. A method for forming a weather strip, comprising: extruding the weather strip; and, after the extrusion, the mounting portion supports the seal portion in an inclined posture by the projection.