JPS59124810A - Preparation of weather-strip - Google Patents

Abstract

PURPOSE:To elevate abutting precision and to decrease insufficient sealing by a method wherein initially extruded material is cut according to the peripheral edge length of a window opening part, ends are butt-welded against each other and joined in the form of a closed loop and in corner parts a base part only is cut off, the base part being cut off is molded and connected by injection molding. CONSTITUTION:A weather-strip 1 consists of a base 1a installed to the peripheral flange P0 of a car window and a seal lip 1b in elastic contact with a window panel G. The base 1a and the seal lip 1b are extruded and cut to the dimension corresponding to the peripheral edge length of a window opening and these ends are butted against each other and bonded with bonding agent to form a weather-strip body 1A in the form of a closed loop. Only the base 1a of a corner part haing a large curvature is cut off and the seal lip 1b is left as it is. Then a base 1a' injection-molded to the cutoff part is bonded with a seal lip 1b and vertical and horizontal parts adjacent thereto to complete the desired weather-strip 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a weather strip, particularly a weather strip for a rear side window.

In general, the rear side window RW is attached with a generally trapezoidal window panel G as shown in FIG. 1, and the front end side is used as a hinge point so that the window panel G can be opened and closed with a slight degree of opening.

An opening that follows the shape of the wind panel G is formed in the rear side panel P of the vehicle body, and a weather strip is attached to the edge of this frontage cylinder so that when the wind panel G is closed, the inside and outside of the vehicle interior are air-liquid-tightly sealed. I have to.

By the way, this weather strip W consists of a seal lip wb that comes into elastic contact with the wind panel G when closed, as shown in FIG. By joining these two sections, a closed-loop weather strip W is constructed.

In other words, the parts corresponding to the corners with thick curvature shown by X, Y, and Z in Figure 1 are molded using an injection molding machine, and the parts corresponding to other straight parts and corner parts with small curvature are extrusion molded. To explain the corner part, which is formed by a machine and shown in Fig. 1, The part We corresponding to the corner part However, since both the base Wa and the seal lip Wb are formed in the portion We corresponding to the corner portion X, seams M occur at two locations as shown in FIG. Even if the extrusion molded part and the injection molded part are butt-joined at this joint M with a fairly high level of precision control, steps and dents will occur because the butt is done inside the mold, and there will be a window at the joint M. The sealing surface for the panel G is discontinuous, there is a risk of water leaking from the joint M, there are problems in ensuring sealing performance, higher molding precision is required, and there is a problem of poor manufacturability.

The present invention was made to solve this problem, and provides a method for manufacturing a weatherstrip that has excellent manufacturability while ensuring sealing performance.

In order to achieve this object, in this invention, a weather strip is basically extruded and cut into pieces corresponding to the same length of the window opening periphery, and the cut ends are butted and joined to form a closed loop. At the same time, only the base of the part corresponding to the corner with a large curvature is cut, leaving the seal lip, and then the cut base is formed using an injection molding machine and joined together to prevent seams from forming on the seal lip. The joints can be kept to a minimum, and the joints can be butted at a place where they can be seen sufficiently outside the belly, so that the precision of the butt can be increased and seal failures caused by the joints can be eliminated.

The present invention will be explained below using an example shown in the drawings.
In the figures and FIG. 6, the weather strip 1 structurally consists of a base 1a that attaches to the window opening peripheral flange po of the rear side panel P of the vehicle body, and a seal lip 1b that projects from the base 1a and comes into elastic contact with the wind panel G. ing.

Then, the base portion 1a and the seal lip 1b are extruded and cut into a size corresponding to the circumference of the opening edge of the window opening, and both cut end surfaces are butted together and bonded using adhesive (not shown) to form a closed loop. A weatherstrip main body IA is formed. Thereafter, only the base portion 1a of the weatherstrip body IA is cut at the portion corresponding to the corner portion (x, y, z portions in Fig. 1) with a large curvature at the peripheral edge of the window opening, and the seal lip 1b is cut off.
Leave it as is. Thereafter, the cut portion of the base portion 1a is inserted into the mold F′ of an injection molding machine, and the base portion 1a′ is molded into the cut portion by injection molding, forming the seal lip 1b and the adjacent upper and lower 9 straight lines. Weatherstrip 1 is connected to the weatherstrip main body IA of the
is finally formed.

With this configuration, the end faces of the weatherstrip main body IA can be butt-bonded together where they can be seen visually, allowing for highly accurate butt-bonding work, and even if a seam appears, a large step or dent will occur at the joint. It is possible to form a continuous and smooth seal lip surface without causing any damage.

Also at the corner part, the seal lip lb' is integrally continuous with the other seal lip 1b, so there is no seam, and the sealing surface against the wind panel G is continuous.
Seal failure will no longer occur, and sufficient sealing performance can be ensured.

In addition, the injection molding at the corner portions is simple, as it only involves molding the base portion 1a/, and a high level of precision is not required.

Note that the butt-joining of the end faces of the extrusion-molded main body IA and the cutting of the base portion 1a corresponding to the corner portion in the above description may be reversed, so that the base portion 1a is cut first.

As described above, according to the present invention, it is possible to manufacture a weather strip with good sealing performance, and the manufacturing efficiency thereof is also extremely easy, which is very effective in practical use.

[Brief explanation of the drawing]

Fig. 1 is a rear perspective view of the automobile, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Figs. 3 and 4 are explanatory partial cross-sectional views of the X section in Fig. 1, respectively, showing conventional examples. and FIG. 5 is an exploded explanatory view showing an outline of the manufacturing process of the X part. FIG. 6 shows an example of the present invention, and is similar to FIGS. 3 and 4, respectively. P......Vehicle rear side panel, PO...
・・・・・・Vehicle window opening same edge flange, G・・・・・・
...Wind panel, 1... Weatherstrip, IA... Weatherstrip body, 1a... Base, 1b... ...
...Seallip's representative patent attorney Ishido 2 Ru 1 1. 1t-(-,,,;

Claims (1)

[Claims] A weather strip consisting of a base that attaches to a window opening-level part of a vehicle body and a seal lip that projects from the base and comes into elastic contact with a wind panel, the base and seal lip being extruded to form a window opening opening edge. A weatherstrip main body is formed by cutting it to a size corresponding to the department head, and both cut end surfaces of this main body are butted and joined to form a closed loop shape, and the weatherstrip body is formed into a closed loop shape corresponding to the corner portion of the window opening periphery of the main body. The weather strip is characterized in that the base portion is cut leaving only the seal lip of the portion, and the portion corresponding to the cut base portion is molded with an injection mold and joined to the main body to form a weather strip. Method of manufacturing strips.