JPH03128229A - Production of weatherstrip - Google Patents

Abstract

PURPOSE:To improve the sealing properties, appearance and quality of the subject weatherstrip by molding the corner part of a sub-seal having an abutting protrusion by means of injection and joining a main seal to the sub-seal. CONSTITUTION:A main seal 16 that is positioned and mounted on the opening edge side of the opening of an automobile is formed by bending a plane part 13 of an original main seal in such a manner that engaging protrusions 15 of said original shape are directed inward and the tip ends of the engaging protrusions are directed toward the side of an abutting protrusion 14 of the original shape. On the other hand, a sub-seal 21 in the vicinity of the corner of the opening is produced by an injection process separately from the main seal 16. The molded main seal 16 is set on an injection mold. The sub-seals 21 divided into three parts are injection-molded with sponge rubber, respectively, and are joined unitarily with the main seal 16. In addition, an inner seal 23 is embedded in a part of the sub-seal 21 having an abutting protrusion 22, and solid rubber 25 is embedded in advance in a place where an abutting protruding part 24 is formed, thereupon injection is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a weather strip. Specifically, the present invention relates to a method of manufacturing a weather strip installed in an opening of an automobile for the purpose of waterproofing or the like.

(Prior Art) Conventionally, openings (102), (102) are provided in a part of a fixed roof (101) of an automobile as shown in FIG. 10, and openings (102), (102) are opened and closed as shown in FIG. Roof (103)
It has been known that it is necessary to install weather strips at the openings (102) of a motor vehicle having a retractable roof covering each opening (102) to make them waterproof. In order to improve the waterproofing effect, it is known that the weather strip is double-sealed.

In the double seal, continuous waterproof protrusions of the weather strip are provided from the indoor side to the outdoor side so as to form a main seal and a sub seal.

On the other hand, while the outer corners of the opening (102) of the retractable roof (103) are rounded for reasons such as convenience of installation, the inner corners of the openings (102) and (102) are rounded due to their strength. The corners are rounded for reasons such as the top or waterproofing.

The weather strip (104) covers the area from the outer periphery of the opening (102) to the inner periphery of the opening (102) when the retractable roof (103) made of glass or the like is installed, and also covers the front pillar (105), center Pillar (106)
Cover the entire periphery of the opening. In this case, the weatherstrip (104) has an approximately U-shape as a whole.

Therefore, the main knoll (
Ill), the weather strip (104) having the sub-seal (112) is attached to the screw (+) through the molding (113).
14), it was attached to the opening (102), but this had the problem of increasing the number of parts.

Further, the weather strip (104) has a hollow abutment projection (107) on the upper part as shown in FIG. 12, and a flat part ( 109), and the plane part (109)
There is a locking protrusion (107) on the opposite side from the abutting protrusion (107).
10), a rubber weatherstrip prototype having a cross-sectional shape with the inside 0111 projecting obliquely is first continuously formed by extrusion molding. Next, as shown in FIG.
Fold 0) inward and with the tip facing upward [111
I'm going to go. A weatherstrip (104) as shown in FIG. 13 is then obtained.

Then, each of the locking protrusions (110) of the weather strip (104) is fitted into the metal end of the opening (102) of the automobile body and fixed for use. The weather strip (104) is generally manufactured by such a manufacturing method consisting of extrusion molding and bending processes, so once the linear main seal on the indoor side is made, the main seal with such a shape can be made. The manufacture of a weatherstrip (104) consisting of a sub-seal having corners such as A%B as shown in FIG.

Therefore, the weather strip is divided into two parts, a main seal and a sub seal, and
The main seal of the weather strip is attached to the retractable roof (103), the molding is attached to the retractable roof (103), and the sub seal of the weather strip is attached to the retractable roof (103).
103) When installing in the opening I (102), a method may be considered in which both seals are combined to form a double seal. However, such a method has the problem that it is necessary to separately attach a molding to the retractable roof (103) made of glass or the like.

Therefore, it was considered to integrally mold the entire weather strip by injection molding.

(Problems to be Solved by the Invention) However, integrally molding the entire weather strip by injection requires a large-scale molding rubber mold and equipment, resulting in an increase in cost.

(Means for Solving the Problems) This invention has a plate-shaped flat part in which a reinforcing inner is embedded, a contact projection on the upper part of the flat part, and a lower surface facing diagonally inward. A step of obtaining a main seal prototype having a protruding locking protrusion by extrusion molding, and then bending the flat part of the main seal prototype with the locking protrusion inward and the tip facing the abutting protrusion. A method for manufacturing a weatherstrip, comprising the steps of forming a main seal, molding at least the corners of a sub-seal having an abutment projection by injection, and joining the main seal and the sub-seal obtained by injection. I will provide a.

(Function) Inside is a plate-shaped flat part with a reinforcing inner layer embedded inside.
A process of obtaining by extrusion molding a main seal prototype having an abutment protrusion on the upper part of the flat part and a locking protrusion projecting diagonally inward on the lower surface, and then the locking protrusion of the main seal prototype. A process of forming a main seal by bending the flat part inward and with the tip facing the abutting protrusion, molding at least the corner part of the sub-seal having the abutting protrusion by injection, and molding the main seal and the injection part. In the process of joining the sub-seal, a reinforcing inner layer is embedded inside and a contact protrusion is formed on the top of the bent flat part, with the tip provided inside the flat part facing toward the contact protrusion. A weather strip is obtained in which a main seal consisting of a locking protrusion and a sub-seal whose at least corner portions are formed by injection are bonded together.

(Embodiment) Fig. 1 shows an overall outline of a weather strip according to an embodiment of the present invention, Fig. 2a shows details of each part thereof,
Figure 2 b1 Figure 2 01 Figure 2 d. Figure 7 shows the condition, Figures 8 and 9 show part of the manufacturing process of the weather strip, and Figures 15 and 16 show part of the manufacturing process of other embodiments. Therefore, I will explain.

(11) is a main seal prototype. The main seal prototype (It) has a plate-shaped flat part (
13) and hollow abutment protrusions (14) protruding from the upper part of the flat part (13), and two locking protrusions protruding diagonally inward from the lower surface. It has a protrusion (15).

The main seal prototype (11) is the reinforcing inner (12)
It is made of sponge rubber, except for the parts, and is obtained entirely by extrusion molding. Next, by bending the flat part (13) of the main seal mold (11) with the locking protrusion (15) inward and the tip facing the abutting protrusion (14), the main seal mold (11) is positioned on the opening edge side of the automobile opening. The main seal (1
6) Form.

On the other hand, the sub-seal (21) is manufactured by an injection method separately from the main seal (16) near the corners of the opening. That is, the molded main seal (16)
Place on the injection mold. Next, the sub-seal (21), which is divided into three parts, is injection-molded using sponge rubber and is integrally joined to the main seal (16). (22) is a contact projection of the sub-seal (21). As shown in FIG. 6, an inner (23) is embedded in a part of the sub-seal (21), and a solid rubber (25) is embedded in the part where the abutting convex part (24) is formed.
is buried in advance and injected.

Then, as shown in FIGS. 1 to 7, a reinforcing inner (12) is embedded inside and a contact protrusion (14) is provided on the upper part of the bent plane part (13), A main seal (16) consists of a locking protrusion (15) provided on the inside of a bent plane part (13) with its tip facing toward the abutment protrusion (14), and the corner part is formed by injection. A weather strip (31) is obtained in which the weather strip (31) is joined to the sub-seal (21) by vulcanization adhesion or the like.

Other molding methods include the method shown in FIG. 15. In this method, the main seal (16) and sub-seal (21) are obtained by extrusion molding in advance. Next, the non-conforming part in the sub-seal (21), for example, the corner a
, cut a.

Then, it is placed in an injection mold in this state, and the corner portions of the cut sub-seal (21) are injection molded. Corner a of the sub-seal (21) then obtains a weather strip having an appropriate shape as shown in FIG.

As shown in FIG. 7, the obtained weather strip is attached to the locking protrusion (1) at the tip of the opening edge (33) of the opening (32) of the opening/closing roof installation part of the automobile body (34).
5) Fit it in between and fix it.

(Effects of the Invention) Therefore, in this invention, without impairing the sealing performance due to continuous sealing by extrusion molding, the sub-seal improves sealing performance at low cost and has an appearance quality similar to that of some injection molded products. It also improves.

Furthermore, it becomes possible to easily manufacture a weatherstrip having a double seal.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of a weather strip according to an embodiment of the present invention, and FIG. 2 a1 shows details of each part. Figure 2c
1 Figure 2 d1 is a detailed view of each part, Figure 3 is Figure 2 A-
A sectional view, FIG. 4 is a BB sectional view in FIG. 2a, FIG. 5 is a CC sectional view in FIG. 2a, and FIG. 6 is a DD sectional view in FIG. Figure 7 is a state diagram showing how the weather strip is attached to an automobile opening, Figures 8 and 9 are diagrams showing part of the manufacturing process of the weather strip, Figure 10, Figure TI,
Figures 12, 13, and 14 are conventional examples; Figure 15;
FIG. 16 is a diagram showing a part of the manufacturing process of another embodiment.

Claims (1)

[Claims] Inside is a plate-shaped flat part with a reinforcing inner layer embedded inside.
A process of obtaining by extrusion molding a main seal prototype having an abutment protrusion on the upper part of the flat part and a locking protrusion projecting diagonally inward on the lower surface, and then the locking protrusion of the main seal prototype. The step of forming the main seal by bending the flat part inward and the tip toward the abutting protrusion, molding at least the corners of the sub-seal having the abutting protrusion by injection, and molding the main seal and the flat part by injection. A method for manufacturing a weather strip, comprising the step of joining a sub-seal to a sub-seal.