JPH0639897A - Method for molding of weatherstrip - Google Patents

Abstract

PURPOSE:To mold the base part of a sealing part into a easily deformable thin part in such a way that the seaing part can be made into a required posture when a weatherstrip is assembled and to prevent the sealing part from falling down caused by warpage of the base part in a molding process in a method of the weatherstrip wherein the sealing part is extended from the base part for fixing. CONSTITUTION:In an extrusion process of a weatherstrip, a weatherstrip wherein a sealing part 52 is made into an inclined posture being larger than the assembled posture by making a base part 54 as a center for bending in such a way that the sealing part 52 does not interfere with other parts of the weatherstrip and a projection 56 the apex of which is close to and facing to a fixing base part 51 is provided on the side face of the inclined side of the sealing part 52, is extruded and after extrusion, the sealing part 52 is supported on the fixing base part 51 by the projection 56.

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 weatherstrip used in an automobile.

[0002]

2. Description of the Related Art A weather strip made of rubber is attached around the opening of an automobile body to seal the outer circumference of a member for opening and closing the opening.

Taking the sunroof of an automobile shown in FIG. 6 as an example, as shown in FIG. 6, around the opening of the roof 1, a seal portion 42 is connected to a side surface of a mounting base portion 41 by a neck-like root portion 44. The weather strip 4 having the above structure is assembled, and seals between the outer periphery of the sunroof 2 and the opening of the roof 1 when the sunroof 2 is closed. In addition, at the top end of the mounting base portion 41, another seal portion 43 that comes into contact with the lower surface of the sunroof 2 is provided.
And the insert 4 is attached to the mounting base 41.
7 is buried.

By the way, since it is difficult to extrude the weather strip 4 into the cross-sectional shape as it is, as shown in FIG. 8, in the extruding step, the mounting base portion 41 is formed in a flat plate shape and the sealing portion 43 is formed. In order to avoid interference, the seal portion 42 is extruded in a tilted shape with the root portion 44 as the bending center, and after vulcanization, the mounting base portion 41 is bent into a U shape. Then, when assembling to the roof, as shown in FIG.
As shown in FIG. 5, the seal portion 42 is pressed against the roof 1 to bend and deform the root portion 44 to change the posture.

[0005]

By the way, the root portion 42
However, if it is thick, it is difficult to bend when assembling the weather strip, and if it is forcibly bent, the entire seal portion 42 is irregularly deformed and the sealability is improved.

On the other hand, however, if the root portion 42 is made thin, the root portion 42 bends in the process of being extruded after the weather strip and conveyed to the vulcanizing step, so that the seal portion 42 is formed as shown in FIG.
It droops greatly in the direction of arrow C and is vulcanized in a completely different posture from the expected posture. When assembled in this posture, the seal portion 42 is also deformed undesirably. In addition, the seal part 4 is hung down after extrusion.
There is also a problem that the side surface of 2 and the mounting base 41 are contact-bonded. As described above, it is extremely difficult to achieve both the deformability at the time of assembling the root portion 42 and the shape retention after extrusion.

In view of the above, the present invention is directed to a sheet connecting to the mounting base.
An object of the present invention is to provide a method for forming a weather strip in which the root portion of the base portion is made thin so that it can be easily assembled, and the shape retention of the root portion during molding is ensured.

[0008]

DISCLOSURE OF THE INVENTION The present invention comprises a mounting base and a seal extending from the mounting base.
In a weather strip in which extrusion is performed in a posture in which the rail portion is tilted with respect to the mounting base portion, as shown in FIG. 2 (A), the tip end is attached to the mounting base portion 5 from the side surface on the tilting side of the seal portion 52.
1 is extruded, and after extrusion, the seal portion 52 is supported by the projection 56 as shown in FIG. 2 (B).

[0009]

Even if the root portion 54 is thinned, the seal portion 52 is supported by the projection 56, so that no undesired sagging occurs. Although the tips of the protrusions 56 are brought into contact with and joined to the mounting base 51, they can be easily torn and separated after vulcanization.

[0010]

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

As shown in FIG. 2A, the attachment base portion 51 of the weather strip 5 extruded by the extruder has a flat cross section and has an insert 57 integrally extruded. A hollow seal portion 53 having a substantially circular cross section projects from the center of one surface of the mounting base 51 in the width direction, and a hollow seal portion 52 having a substantially triangular cross section is connected to one end in the width direction by a neck-shaped root portion 54. is doing. The base 54 is the mounting base 51.
Of the mounting base 51.
It is in a posture of falling to the side. Seal lips 57 and 58 project from the side surface of the seal portion 52 on the collapsed side.
A protrusion 56, which is a feature of the present invention, projects from the vicinity of the base 54 inside the seal lip 58. The projection 56 has a substantially triangular cross-section, and its pointed tip is in close proximity to one end of the mounting base 51.

The weather strip 5 has a seal portion 52,
53 is made of sponge rubber, and the other portion is made of solid rubber. However, the unvulcanized root portion 54 immediately after extrusion is flexible, and the seal portion 52 tries to further collapse around the root portion 54 as a bending center. However, as shown in FIG. Comes into contact with and is supported by the mounting base 51. After that, the weather strip 5 is fed to a vulcanizing tank by a known method for vulcanization, and then fed to a bending machine to bend the mounting base 51 into a U-shape and cut into a predetermined length. . In the obtained weather strip 5, the tips of the protrusions 56 are joined to the mounting base 51, but they are separated by tearing or cutting. The joints are extremely thin and are easily separated.

FIG. 1 shows a state in which the weather strip 5 obtained as described above is attached to a sunroof roof opening. The periphery of the opening of the automobile roof 1 has a stepped sectional shape, and a standing flange 11 is formed at the opening edge. When the mounting base portion 51 of the weather strip 5 is pushed into the flange 11, the seal lips 57, 58 are pushed against the horizontal portion 12 of the roof 1 and the outer side surface of the seal portion 52 is pushed by the vertical portion 13, so that 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
When 3 touches the lower surface of the sunroof 2, a double seal is formed.

According to the molding method of the present invention, however,
Since the seal portion 52 is supported by the projection 56 after the weather strip is extruded, the root portion 54 can be made thin. Then, when the weather strip is assembled, the seal portion 52 can be easily brought into the assembled posture by bending the thin base portion 54.

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

FIG. 3A is a sectional view of the weather strip 6 assembled along the roof side of the automobile.
(B) is a cross-sectional view immediately after being extruded in the extrusion step of the weather strip 6. The weather strip 6 is attached to a flange 31 formed along the roof side 3 and has a U-shaped cross section, and is attached to a side surface of the attachment base 61 in a neck shape by a root 64. It is provided with a hollow seal portion 62 to be pressed, and an inner seal lip 63 that extends from the attachment base portion 61 and elastically hits the inner surface of the door glass 8.

As shown in FIG. 3 (B), the weather strip 6 has a mounting base portion 61 in which an insert 67 is embedded, which is developed into a flat plate, and a seal portion 62 is an inner seal lip 63.
It is extruded in a shape tilted in a direction to avoid interference with. A protrusion 66 is formed on the seal portion 62 at a position facing the end of the attachment base 61, and after extrusion, the seal portion 62 is supported by the attachment base 61 by the protrusion 66, and the same operation and effect as in the previous embodiment. Is played.

In all of the above embodiments, the hollow seal portion is prevented from sagging after the weather strip has been extruded, but the present invention can also be applied to the lip seal portion to prevent sagging. .

FIG. 5 is a cross-sectional view of a main portion of the weather strip 7 having a lip-shaped seal portion 72 extending from the mounting base portion 71 after extrusion, wherein the seal portion 72 has its root portion 7.
4 is supported by the mounting base 71 by the protrusion 76 formed on
It is prevented that the seal portion 72 tilts down.

[0020]

According to the present invention, during the weather strip molding process, the sagging deformation of the seal part with the root of the sealing part as the bending center, and the side face of the seal part and the mounting base part due to this sagging deformation. Since the contact coupling is prevented, the seal portion can be thinly formed so as to be easily bent when the weather strip is assembled. As described above, according to the present invention, it is possible to achieve both the shape retention of the seal portion at the time of forming the weather strip and the deformability of the seal portion at the time of assembling the weather strip.

[Brief description of drawings]

FIG. 1 is an assembled sectional view of a weather strip obtained by the present invention at a position along line AA in FIG.

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

3 is an assembled sectional view of another weather strip obtained by the present invention at a position along line BB in FIG. 4. FIG.

4 is a cross-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 is a sectional view of a conventional weather strip taken along a line AA in FIG.

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

[Explanation of symbols]

 1 Automotive roof 2 Sunroof 4,5,6,7 Weather strip 41,51,61,71 Mounting base 42,52,62,72 Seal 44,54,64,74 Root 56,66,76 Protrusion

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B60J 10/08 B29K 21:00 105: 04 105: 20 4F B29L 31:30 4F

Claims (1)

[Claims] 1. A weather strip in which a hollow or lip-shaped seal portion extends from a mounting base portion, and the sealing portion is extruded in a posture inclined with respect to the mounting base portion in an extruding step,
In a weather strip that changes the posture of the seal part around the root of the seal part during assembly, the protrusion has a projection that protrudes from the tilted side surface of the seal part and whose tip closely opposes the mounting base. A method for forming a weather strip, comprising extruding the weather strip, and after the extruding, the seal portion in a tilted posture is supported by the mounting base by the protrusion.