JPH04121244A - Weather strip for automobile - Google Patents

Abstract

PURPOSE:To obtain a weather strip, which can be easily die-molded, and which does not generate inconvenient deformation in a trim part by forming a protruded part of die-mold that is protruded to the trim part at a certain interval, on the connection boundary between the trim part and a lip part that is die- molded. CONSTITUTION:A weather strip 4 is provided with a trim part 41 of cross section of a letter-C shape, which is mounted on a flange 21 of a drip rail 2, a lip 42 extended from one end of an opening 410 of the trim part 41, and a seal part 43 extended from the outer surface of the trim part 41. Regarding the die-molding of a lip 42A, the trim part 41 is set in a metal mold in such a way that it is curved into a corner shape, with the side a notch part 44 is formed on the lip 42, is defined as an outer diameter side, and a rubber member is injected into the notch part 44. The lip 42A of die-molding, which is continued from the lip 42 of extrusion molding, is thus formed. As a result, a protruded part 45 of die-molding for which a notch 46 is filled, is formed at a certain interval on the connection boundary between the trim part 41 and the lip 42A of die-molding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a weather strip for an automobile, and particularly to the structure of a curved corner portion thereof.

[Prior Art] In an automobile as shown in Fig. 5, a drip rail is formed on the opening edge along the roof side 1 of the door opening on the side of the body, and a weather strip is attached to the flange forming the edge. .

As shown in FIG. 6, this type of weather strip 4 includes a lip 42 extending from the upper open end of a trim part 41 having a C-shaped cross section and attached to the flange 21 of the drip rail 2, the tip of which touches the side surface of the roof panel. Trim part 4
A sealing portion 43 that contacts the door frame 31 of the door 3 on the side surface of the door 3 is used. The trim portion 41 and lip 42 are made of solid rubber, and the seal portion 43 is made of sponge rubber. Note that the trim portion 41 may have a cross-sectional shape close to a U-shape, and hereinafter, the C-shape includes the U-shape.

This weather strip 4 is extruded. by the way,
At the corner part of the body (part A in Fig. 5), the weatherstrip 4 is curved into a corner shape with the lip 42 side on the outer diameter side as shown in Fig. 7, but it is difficult to curve it as it is extruded. At the corner part of the weather strip 4, the lip 42 is cut out and curved into a corner shape.
A lip 42A that replenishes the cutout portion is formed by molding (Utility Model Application No. 88818/1988).

However, in order to make it easier to curve into a corner shape, the eighth
As shown in the figure, if the lip 42 including the upper opening end of the trim part 41 is cut out, when it is curved and set in a mold for molding, the lower side of the trim part 41, that is, the inner diameter side of the curve, will maintain the weight balance. Due to the relationship, the trim portion 41 is deformed so as to be tilted in the direction of arrow B and close the opening 410 of the trim portion 41. Therefore, lip 4
When molding 2A, setting the trim part 41 in the mold has poor workability. Note that C is the central axis of curvature.

On the other hand, if only the lip 42 is cut out so as not to cover the trim part 41 in order to prevent such deformation, the trim part 41 will have a high rigidity and will be difficult to bend, and the trim part which was curved after molding will recover its shape in the straight direction. However, undulation occurs in the lip 42A, and the workability of attaching it to the drip rail 42 (FIG. 6) also deteriorates.

[Problems to be Solved by the Present Invention] Therefore, the present invention provides a molding method in which a lip extends from one end of a trim part having a C-shaped cross section, and this lip is cut out at a curved corner part to replenish the notched part. The object of the present invention is to provide a weatherstrip with a lip that is easy to mold and that does not cause undesirable deformation of the trim portion.

[Means for Solving the Problems] As illustrated in FIG. 1, the present invention provides a corner portion of a weather strip with a predetermined interval at the connection boundary between the molded lip 42A and the trim portion 41. , trim part 4
It is characterized in that a molded protrusion 45 protruding toward 1 is formed.

[Operations and Effects] In the lip notch state before the lip 42A is replenished by molding, a notch 46 corresponding to the protrusion 45 is formed at one open end of the trim portion 41, as shown in FIG. Therefore, it is easy to curve the trim part 41 into a corner shape, and since there is an uncut part between the notches 46, when the trim part 41 is curved, the above-mentioned inclination B (FIG. 8) is Does not occur.

[Embodiment 1] As shown in FIGS. 1 to 3, the weather strip 4 includes a trim part 41 having a C-shaped cross section attached to the flange 21 (FIG. 6) of the drip rail 2, and an opening 410 of the trim part 41. It includes a lip 42 extending from one of the edges and a sealing part 43 extending from the outer surface of the trim part 41. The trim portion 41 and lip 42 are made of solid rubber, and the seal portion 43 is made of sponge rubber. The weatherstrip 4 is extruded, and a lip 42 is notched at a corner, and a lip 42A that is continuous with the extruded lip 42 is formed in the notch by molding in a curved corner shape.

FIG. 4 shows a state in which the lip 42 is cut out at a portion that should become a corner part.The lip 42 is cut out from its base, and the upper opening end of the trim part 41 is inserted at a predetermined interval on the edge of the cutout. An incision 46 for cutting is formed. The molding of the lip 42A is carried out by setting the trim part 41 in a mold (not shown) with the trim part 41 curved into a corner shape as shown in the figure, with the side where the notch part 44 is formed on the lip 42 being the outer diameter side. The rubber member is injected into the notch 44. As a result, a molded lip 42A that is continuous with the extruded lip 42 is formed in the notch 44. As a result, the trim portion 4
1 and the molded lip 42A are formed with molded protrusions 45 filled with the above-mentioned notches 46 at predetermined intervals.
1 is curved and set in the mold, the trim part 41
Since the notch 46 is provided at the end on the outside diameter side of the curve, it can be easily bent, and no gaping occurs due to the inclination (FIG. 8) that occurs when the entire end is notched.

In addition, if only the lip 42 is cut out without providing the notch 46, the rigidity of the trim portion 41 causes deformation of the corner portion to restore its linear shape after the corner portion is formed, and this causes the molded lip 42A to deform. is compressed and becomes wavy. However, in the present invention, since the cutout 46 is provided in the trim portion 41, such deformation does not occur, and the corner portion remains in the corner shape even after molding, making it easier to assemble to the drip rail 2 (FIG. 6). Good too.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention. FIG. 1 is a perspective view of a corner of a weather strip, and FIGS. - Figure 4 is a cross-sectional view taken along the line Vl - Vl of Figure 5. Figure 4 is a diagram showing the state where the lip is cut out at the corner of the weather strip. Figure 5 is a side view of the automobile. 7 is a perspective view of a corner portion of a conventional weather strip, and FIG. 8 is a diagram showing an inclination occurring at a corner portion of a conventional weather strip. 2...Drip rail 21...Flange 31...Door frame 4...Weather strip 41...Trim part 42...・Lip 42A...Mold molding lip 44...Notch portion 45...Protrusion portion 46...Notch A...Corner part 1st Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] A weather strip comprising a trim part having a C-shaped cross section attached to a flange provided along a door opening of an automobile body, and a lip extending from one of the opening ends of the trim part, the weather strip having a curved corner. In the weather strip with a molded lip, a molded protrusion is formed at the connection boundary between the trim part and the molded lip part to protrude into the trim part at a predetermined interval. Weather strip for automobiles.