DE3336733A1 - Method and device for connecting the ends of sealing strips - Google Patents

Abstract

The invention relates to the laying of sealing profile strips on door and window openings in motor vehicles and for similar purposes and in particular to the production of fold-free curved bends, abutting strip ends also in general having to be interconnected. According to the invention, the different cross-sectional parts of the profiled strips are separated from one another by a longitudinal cut and bent into the envisaged shape one after another, whereupon, after cutting flush the ends, the connection can be made. The invention thus avoids the manufacture of separate curved shaped pieces, the filling of the connection points with additional filler and other known expensive measures.

Description

Method and apparatus for joining the ends of

Weather Strip The invention relates to methods of joining of the ends of sealing strips composed of two or more steep cross-sections made of rubber or rubber-like plastic in the area of the arch of curvature as well to devices for performing such procedures.

Elastic sealing strips for doors, windows and trunk lids in motor vehicles or for door and window openings in buildings, for Closing lids on apparatus and devices of all kinds and for similar purposes usually have to perform two functions at the same time: one is the reliable one Sealing and on the other hand, as a prerequisite for this, a firm press fit the opening border. Even this double function has a comparatively complicated, Long or wide-stretched cross-sectional design result, and the multi-part Appearance is further enhanced by the frequently raised demand after inclusion of additional moldings, piping and the like. For installation in their Use position, for example, as a ring-shaped self-contained sealing frame the sealing strips almost always - apart from a few exceptional cases - several times Angled over a corner or laid bent in more or less strong curvatures will. Here, the flawless production throws above all the over proportionate small radii curved, in extreme cases with an abrupt direction change of direction kinked elbow pieces on considerable difficulties, which so far by inserting specially made fittings, by injection molding in molds and according to others similar Elaborate procedures were attempted to counteract. The invention is opposed to this as a task, curved and angular sections of perfect condition under No additional filler compound or filler pieces from the sealing strips themselves and to form regardless of their particular cross-sectional shape.

To achieve this object is according to the invention for methods of The type described at the outset is provided that the inside and outside of the Curvature arc associated cross-sectional parts through a longitudinally over cut essentially separated from one another, one after the other bent into the intended shape and after bundling their free ends to the adjoining end of the strip attached and cohesive with this and with each other are connected, with the appropriate first that of the inside and then the cross-sectional position associated with the outside of the arch of curvature is bent.

The invention circumvents the problem of the relatively broad profiled Bend sealing strips without creases by temporarily cutting them lengthways in the area of curvature and the possibility created by it, both are then essential to bend narrower cross-sectional parts individually and only then again to unite with each other. The inevitable resulting difference in length - The respective outer cross-sectional part is closed over a longer arc section bend; is compensated for by shortening the inner cross-sectional part, with which also eliminates the otherwise existing cause of distortions and wrinkles is. On the insertion of fittings, injection of additional elastomer compound and similar supplementary measures can be completely dispensed with.

For the practical implementation of the novel process takes place expediently a mold plate with one of the end sections of the butting Weatherstrip receiving open mold cavity use, and according to one Important feature of the invention, this has the mold cavity in the area of The joint of both ends of the strip intersecting, preferably in a straight line over the entire length Width of the mold plate guided cutting groove for receiving and guiding a cutting knife on. In the open mold cavity of such a mold plate, the individual Cross-sectional parts of the sealing strips independently of one another without difficulty insert with the intended curvature and one after the other in close contact with each other bring, while the cutting groove in a simple manner the edge cutting of the regional protruding strip ends permitted. By simply creating the assigned Opposite strip can then complete the connection and after placing one Cover plate can be vulcanized or polymerized in the usual way.

To illustrate the invention, a mold plate is in use with the trimmed ends of two sealing strips to be joined together in the drawing shown in perspective.

The drawn mold plate 1 forms the lower part of a manufacturing device, which includes an associated upper shooting plate, not shown. she is used for vulcanizing only the one inevitably always containing a connection point Arch sections frame-like self-contained rubber sealing strips 2 and is for this purpose with a curved profile that simulates the profile of the sealing strip open mold cavity 11 equipped. In the transition area between the curved and a straight course of the mold cavity extending tangentially therefrom 11 this is of a straight line extending over the entire mold plate open cutting groove 12 crossed.

The sealing strip 2 is functional in the example shown from a comparatively wide but flat mounting part 22 and a hose-like one hollow sealing part 21 composed.

To make the connection after the procedure, both strip parts 21, 22 by an approximately over the area of the arch of curvature guided Longitudinal section separated from one another and one after the other in the following order: sealing part 21 - Bracket part 22 inserted into the mold cavity 11, the bracket part 22 brought together again with the already curved sealing part 21 in the direction of the arrow will. The uneven strip end protruding into the cutting groove 12 is then by a section with a not drawn along the cutting groove Knife cut flush, and then the associated further strip end applied and the connection completed by vulcanization.

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Claims (4)

Claims: 1. A method of joining the ends of two or more cross-sectional parts composite sealing strips made of rubber or rubber-like plastic in the area of bends, characterized in that that the cross-sectional parts associated with the inside and outside of the arc of curvature by one which is guided in the longitudinal direction over essentially the area of curvature Cut separated from each other, bent one after the other into the intended shape and after Cut their free ends flush with the abutting end of the strip and be firmly connected with this and with each other. 2. The method according to claim 1, characterized in that first that of the inside and then that of the outside of the arc of curvature Cross-section part is bent. 3. Device for performing the method according to the claims 1 and 2, with a mold plate with one of the end portions of the abutting Sealing strips receiving open mold cavity, characterized by a Cutting groove intersecting the mold cavity (11) in the area of the joint between the two strip ends (2) (12) for picking up and guiding a cutting knife. 4. Apparatus according to claim 3, characterized in that the cutting groove (12) is guided in a straight line over the entire width of the mold plate (1).