JPH07125104A - Weather strip for automobile - Google Patents

Abstract

PURPOSE:To mold a long lip part with a relatively large width without corrugation. CONSTITUTION:A form supporter 5 made of hard solid is installed at the extended end of a lip part 4 so that the part 4 keeps firmly its original form by the form supporter 5 even when it is expanded in a curing process after extrusion. In this way, the lip part 4 can be well molded in a predetermined form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip for an automobile mounted on a vehicle body panel of the automobile.

[0002]

2. Description of the Related Art Generally, various weather strips are mounted on a vehicle body panel of an automobile. For example, a wind molding is attached to an outer peripheral edge portion of a window glass arranged in a window opening portion of a vehicle body panel, and a door molding is attached to an outer peripheral edge portion of a door panel.
Such various weather strips have a mounting portion mounted on the vehicle body panel side and a lip portion extending from the mounting portion. Whereas the mounting portion is formed from a hard resin material, the lip portion is usually
It is made of foam such as sponge.

The weather strip for automobiles as described above is generally formed by extrusion, but is vulcanized by heating after extrusion.
In this vulcanization step, the lip portion is foamed and expanded to be molded into a predetermined elasticity.

[0004]

However, in a weather strip having a lip portion made of such a foam, the lip portion may be formed in a wavy state due to foaming and expansion of the lip portion during vulcanization. is there. This waving phenomenon tends to increase to the extent of the tip of the lip portion, making it difficult to form a weatherstrip having a wide and long lip portion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a weather strip for an automobile, which can be formed into a good shape in its original shape without causing waviness even with a wide and long lip portion. To do.

[0006]

To achieve the above object, a vehicle weather strip according to the present invention comprises a mounting portion mounted on a vehicle body panel side, and a lip portion made of a foam extending from the mounting portion. In a weather strip for automobiles including the above, a shape retainer made of a hard non-foamed body is arranged at the tip end portion in the extending width direction of the lip portion.

[0007]

In the means having such a structure, even if the lip portion is foamed / expanded by vulcanization, the shape-retaining member made of a hard non-foaming material is arranged at the tip end portion in the extending width direction of the lip portion. As a result, the shape of the lip portion is firmly held in its original shape, and deformation such as waviness does not occur.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings. First, the weather strip 1 according to the first embodiment shown in FIGS. 1 and 2 is mounted on the outer peripheral edge portion of a windshield for a sunroof of an automobile, and has the same cross-sectional shape throughout its length. ing. This weather strip 1 has a mounting portion 2 made of a hard resin material (solid material), and a glass insertion groove 2a having a substantially U-shaped cross section and a panel insertion portion which are recessed in the mounting portion 2. Groove 2b
Are fixed to the outer peripheral edge portion of the window glass and the edge portion of the vehicle body panel, which are not shown. A hard rubber material, for example, is used as the hard resin material forming the mounting portion 2.

On the other hand, the outer peripheral side of the mounting portion 2 (right side in the drawing)
A hollow seal portion 3 made of foam such as sponge and having a substantially arcuate transverse cross section is joined to this. This hollow seal part 3
Is for sealing by pressing against a body panel of the other party (not shown).

Further, a lip portion 4 integrally extends from the hollow seal portion 3 downward in the drawing. The lip portion 4 is also made of foam such as sponge, and has a constant width dimension that is relatively long over the entire length. As shown in FIG. 2, a shape-maintaining body 5 made of a hard non-foamed body is embedded in the extending width direction distal end portion (lower end portion in the drawing) of the lip portion 4, and 4, the extending width direction tip portion, in the thickness direction,
It has a three-layer structure of sponge, solid, and sponge. The shape retainer 5 is formed by molding a non-foaming hard resin material such as a hard rubber material into a thin plate shape, and is extruded at the same time as the lip portion 4.

In the weather strip 1 in such an embodiment, even if the lip portion 4 is foamed / expanded and deformed in the vulcanization step after extrusion, it is arranged at the tip end portion in the extending width direction of the lip portion 4. By the shape retainer 5,
Firmly retained in its original shape. Therefore, the lip 4
Can be favorably molded in a predetermined shape without causing wavy deformation as in the prior art.

In the embodiment of FIG. 3 in which the same components as those of the embodiment of FIGS. 1 and 2 are represented by the same reference numerals, in the weather strip 11, the entire width of the lip portion 4 made of foam such as sponge, The shape retainer 15 made of a hard non-foamed body is embedded, and a multilayer structure similar to that of the above-mentioned embodiment is formed. The shape retainer 15 in this embodiment
Are connected to the mounting portion 2 and are integrally formed. As described above, the shape-retaining body made of a hard non-foamed body has a lip portion 4
It suffices that it is arranged at least at the tip portion of the above, and similar effects can be obtained regardless of the width dimension of the shape-retaining body.

On the other hand, the extrusion mechanism for molding the weather strip 11 according to the embodiment of FIG. 3 is provided with a shutter mechanism 20 as shown in FIG. The shutter mechanism 20 is provided with a movable blade 21, and a pair of edge portions 21a, 21a of the movable blade 21 as shown in FIG. 5 are extruded while being pressed from both sides of the lip portion 4. Is configured to be done. When actually forming the extrusion, the movable blade 21
Is reciprocated in the width direction of the lip portion 4 (the vertical direction in the drawing), whereby the pressing portion of the edge portion 21a of the movable blade 21 is appropriately changed in the width direction of the lip portion 4.

Therefore, as shown in FIG. 6, in the weather strip material 11 'immediately after extrusion molding, the cutting line 22 by the movable blade 21 is notched and formed with respect to the lip 4'. . The notch by the movable blade 21 is satisfactorily executed by the holding action of the shape holding body 15.

Then, as shown in FIG.
After cooling, the unnecessary portion 4'a of the lip portion 4'is peeled off along the cutting line 22, and the width dimension of the lip portion 4 is changed along the longitudinal direction. The stripping operation of the unnecessary portion 4'a is also easily and satisfactorily performed by the holding action of the shape holding body 15, and a beautiful stripping surface can be obtained.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

[0017]

As described above, according to the present invention, a shape-retaining member made of a hard non-foaming material is arranged at the tip of the lip portion in the extending direction, and the lip portion is foamed or vulcanized in the vulcanization step after extrusion.
Even if the lip portion is expanded and deformed, the lip portion is firmly held in its original shape by the shape-retaining member, so that the lip portion can be satisfactorily molded into the originally intended shape without causing wavy deformation or the like. it can. In particular, it is possible to form a long lip portion having a relatively large width dimension.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a weather strip for an automobile in one embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a tip portion of a lip portion of the automotive weather strip shown in FIG.

FIG. 3 is a transverse cross-sectional explanatory view corresponding to FIG. 1 showing a weather strip for an automobile in another embodiment of the present invention.

4 is a front explanatory view showing a step of forming a cutting line in an extrusion-molded molding material when molding the automotive weather strip shown in FIG. 3. FIG.

5 is a front explanatory view showing an enlarged part A in FIG. 4. FIG.

6 is an external perspective explanatory view showing a state immediately after a cutting line is put in an extrusion-molded molding material in molding the automobile weather strip shown in FIG. 3. FIG.

FIG. 7 is an external perspective explanatory view showing a step of removing an unnecessary portion along the cutting line shown in FIG.

[Explanation of symbols]

 1,11 Weather strip 2 Mounting part 3 Hollow seal part 4 Lip part 5,15 Shape retainer

Claims (3)

[Claims] 1. A weather strip for an automobile, comprising: a mounting portion to be mounted on a vehicle body panel side; and a lip portion made of a foam extending from the mounting portion. A weather strip for an automobile, characterized in that a shape-retaining body made of a hard non-foamed body is provided in the. 2. The automobile weather strip according to claim 1, wherein the lip portion is formed of a foamed sponge body, and the shape-retaining body is formed of a non-foamed hard rubber material. Weather strip for automobiles. 3. The weather strip for automobiles according to claim 1, wherein the width of extension of the lip portion from the mounting portion changes along the longitudinal direction.