JPH0976835A - Weather strip with core material in it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the increase of the number of part items, and to eliminate the complicated manufacturing work so as to reduce the manufacturing cost by eliminating the irregularity of the outer surface of a product due to a slit of a core material. SOLUTION: A base material part for coating a slit 31 of a core material 29 is provided with plural projections 32 along the longitudinal direction. Irregularity, which appears in the base material part, is formed fine and random by these projections 32. The base material part formed into the projections 32 is covered with the sponge rubber (b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip mounted on a door opening or a door sash portion of an automobile, and more particularly to a weather strip having a core material embedded in a welt portion or the like.

[0002]

2. Description of the Related Art As a weather strip used for a door opening of an automobile or the like, there is a weather strip integrally provided with a welt portion for being clamped to a vehicle body side flange.

As this type of weather strip, conventionally, for example, those shown in FIGS. 3 to 5 have been developed.

This weather strip 1 has a welt portion 2 having a U-shaped cross section formed at the base thereof, and a door side member (in this example, the door glass 3 in this example) on the vehicle outer side wall of the welt portion 2 when the door is closed. Side lip 4 closely attached to the periphery)
An outer peripheral lip 5 is extended, and a vehicle inner lip 6 that is in close contact with a panel material (not shown) of the vehicle body is extended on the inner wall of the welt portion 2. And the welt part 2
A plurality of locking lips 8 are provided on the inner wall surface so as to come into contact with the vehicle body flange 7 when the vehicle body is mounted, and a metallic core material 9 extending in the longitudinal direction is embedded in the wall portion. With this core material 9, a sufficient clamping force with respect to the vehicle body side flange 7 is obtained. Further, the core metal 9 embedded in the welt portion 2 is formed by a comb-shaped sheet metal having a plurality of slits 10 in a direction orthogonal to the longitudinal direction as shown in FIG. The weather strip 1 can be deformed three-dimensionally without lowering the clamping force. Note that the door-side and vehicle-body-side close contact portions of the weather strip 1 are formed of sponge rubber b, and the other portions are formed of a base material a such as non-foaming rubber.

By the way, this weather strip 1 is
The core material 9 is formed by so-called co-extrusion in which the core material 9 is simultaneously extruded from the molding die together with the rubber material (base material a, sponge rubber b). At the time of this co-extrusion, a portion of the base material a covering the slit 10 is formed. The pressure tends to fluctuate according to the unevenness of the slit 10. Therefore, in the above weather strip 1, as shown in FIG. 6, after manufacturing, unevenness 11 substantially along the slit 10 appears on the outer surface of the base material portion that covers the slit 10, and this unevenness appears. 11 may cause a deterioration in appearance after mounting on the vehicle body.

Therefore, as a technique for dealing with this,
Conventionally, for example, a device as disclosed in Japanese Patent Laid-Open No. 64-83432 has been proposed.

This technique eliminates the unevenness of the slit by attaching a tape-shaped thin film having a predetermined hardness on the outer surface of the slit portion of the core material, whereby the unevenness due to the slit is caused in the base material portion covering the slit. I try not to appear.

[0008]

However, in the case of the above-mentioned conventional technique, since the tape-shaped thin film is attached to the slit portion of the core material at the time of manufacturing, the number of parts is increased and the manufacturing is performed. There is a problem that the work of attaching the thin film becomes complicated and the manufacturing cost increases.

Therefore, the present invention is to provide a weather strip containing a core material which can surely eliminate the irregularities on the outer surface of the product due to the slits of the core material without increasing the manufacturing cost.

[0010]

As a means for solving the above problems, the present invention provides a non-foaming base material coated around a core material having slits in a direction substantially orthogonal to the longitudinal direction. In the weather strip consisting of, in the base material portion that covers the slit of the core material, by forming a plurality of ridges along the longitudinal direction, while making the irregularities appearing in the base material portion finer and random,
By covering the base material portion with a foamable material, irregularities did not appear on the outer surface of the weather strip.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIGS.

In the drawings, 20 is a weather strip according to the present invention, 21 is a welt portion having a substantially U-shaped cross section which is sandwiched between vehicle body flanges 22, and 23 is a U-shaped bottom portion of the welt portion 22. The side lip extended to the outside of the vehicle, 24 is an outer peripheral lip extended from the U-shaped tip of the welt portion 22 to the outside of the vehicle, and 25 is extended from the U-shaped bottom of the welt portion 22 to the inside of the vehicle. It is a lip inside the car.
The side lip 23 is formed so as to curve from the welt portion 22 toward the door opening direction of the vehicle body (upward in the drawing),
When the door is closed, the inner peripheral edge portion of the door glass 26 of the sashless door comes into close contact with the outer surface thereof.
The outer peripheral lip 24 is formed to be hollow so that the outer peripheral end surface of the door glass 26 comes into close contact with the lower wall 24a thereof when the door is closed. Reference numeral 27 denotes a mounting lip projecting from the U-shaped tip of the welt portion 21 and brought into close contact with the vehicle body side panel 28 when the vehicle body is mounted.

The welt portion 21 is embedded with a core material 29 which forms the skeleton of the wall portion, and a plurality of locking lips 3 which come into contact with the vehicle body flange 22 when the vehicle body is mounted on the inner wall surface thereof.
0 is extended. The core member 29 is made of a long sheet metal, and has a shape in which a plurality of slits 31 in a direction orthogonal to the longitudinal direction are formed in a comb tooth shape on both sides of the U-shaped bottom portion of the welt portion 21. When the weather strip 20 is manufactured, the cored bar 29 is co-extruded together with the rubber material in a flat state without any bending, and after the extrusion is completed, the cored bar 29 is bent into a U-shaped cross section.

The weather strip 20 has a main portion including a welt portion 21 formed of a base material a made of non-foaming rubber or the like, and has a mounting lip 27 and a part of a locking lip 30. A sponge rubber b as a foamable material is formed from the lower wall 24a of the outer peripheral lip 24 to a part of the surface of the outer wall of the welt portion 21.

By the way, the slit 31 portion of the core material 29 is covered with the above-mentioned base material a, but the base material portion of the core material 29 which covers the slit 31 on the vehicle exterior side is different from that of the core material 29. It is formed thinner than the base material portion covering the portion, and a plurality of ridges 32 along the longitudinal direction are formed at equal intervals on the upper surface side of the thin portion. The sponge rubber b that constitutes the lower wall 24a of the outer peripheral lip 24 extends on the upper surfaces of the plurality of ridges 32, and the plurality of ridges 32 are completely covered by the sponge rubber b. The outer surface of the sponge rubber b is formed so as to be flush with the normal thick portion of the base material portion and flat. Here, the formation of the protrusion 32 and the coating of the sponge rubber b on the upper surface of the protrusion 32 can be easily performed by a known means by slightly changing the shape of the die and the material supply pipe of the extrusion molding apparatus. Can be realized.

As described above, the weather strip 20 has the ridges 32 formed on the base material portion covering the exterior of the slit 31. Therefore, the base material portion is caused by the slit 31. In addition to the unevenness (the unevenness substantially along the slit 31), the ridge 3 orthogonal to the unevenness
The unevenness due to 2 appears, and the unevenness of the base material portion becomes finer and more random than in the case of only the unevenness caused by the slit 31. Therefore, the unevenness of the base material portion does not appear on the outer surface of the sponge rubber b coated on the upper surface thereof.

That is, the unevenness of the base material portion is the slit 3
In the case of only one caused by 1, the unevenness is rough and the direction is aligned only in one direction, so that the sponge rubber b easily follows the unevenness.
In the case of this weather strip 20, the unevenness of the base material portion becomes finer and more random as described above, and it becomes difficult for the sponge rubber b to follow the unevenness. Therefore, in this weather strip 20, it is ensured that unevenness appears on the outer surface of the product because the unevenness of the base material portion can be made finer and random and the unevenness absorbing function of the sponge rubber b itself which is a foamable material has. Can be prevented.

In the above, the case where the comb-teeth-shaped sheet metal is used as the core material has been described, but it is also possible to use a wire bent continuously in a corrugated shape as the core material. It is possible to eliminate the influence of the slit formed in 1 above from appearing on the outer surface of the product as in the above-described embodiment. Further, the weather strip described above can be applied to a door glass run of a vehicle having a door sash with the same structure. Further, although the weather strip using the core material in the welt portion has been described above, the present invention can also be applied to those using the core material in addition to the welt portion.

[0019]

As described above, according to the present invention, by forming a plurality of ridges along the longitudinal direction on the base material portion that covers the slits of the core material, the irregularities appearing on the base material portion can be made finer and random. In addition, by covering the base material part with a foamable material so that unevenness does not appear on the outer surface of the weather strip, the unevenness of the outer surface of the product due to the slits is prevented without increasing the manufacturing cost. It can be surely lost. That is, when this weather strip is manufactured, the protrusion of the base material portion can be formed by slightly changing the molding die for co-extrusion and the material supply pipe to form the protrusion. It can be easily realized by coating with a material,
Moreover, if the molding is performed in this manner, the number of parts is not increased and complicated manufacturing work is not forced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing a main part of FIG. 2 showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 3 showing the same embodiment.

FIG. 3 is a side view of the vehicle.

FIG. 4 is a sectional view taken along line AA of FIG. 3 showing a conventional technique.

FIG. 5 is a front view of components showing the same technique.

FIG. 6 is a partial cross-sectional perspective view showing the technique.

[Explanation of symbols]

 20 ... Weather strip, 29 ... Core material, 31 ... Slit, 32 ... Ridge, b ... Sponge rubber (foamable material).

Claims (3)

[Claims] 1. A weather strip in which a non-foaming base material is coated around a core material having slits in a direction substantially orthogonal to the longitudinal direction, wherein a base material portion covering the slits of the core material comprises: A weather strip containing a core characterized in that a plurality of ridges along the longitudinal direction are formed and the upper surface thereof is covered with a foaming material. 2. The weather strip containing a core material according to claim 1, wherein the core material is made of a comb-teeth-shaped sheet metal. 3. The weather strip according to claim 1, wherein the core material is composed of a wire bent in a corrugated shape.