FR2535953A1 - Sealed watertight slide fastener - Google Patents

Abstract

The lower slide fastener chain and upper slide fastener chain are each connected by vulcanised-in left and right sealing strips (10). In the open position the slide fastener links (5,6) occupy a predetermined inclined position, the sealing strips (9,10) are relaxed and adjoin the links and the stitching seam (7,8) with the support tapes (3,4) adjoin the reverse sides (13) of the links. The sealing strips are greater in volume than the hollow space formed between the chains of links when the latter are closed and brought into the horizontal position. This ensures that when the slide fastener is closed, the sealing strips are fully tensioned, proving an effective water and gas tight seal withstanding high dynamic pressure and strain.

Description

 The present invention relates to a sealed zipper which impermeability to liquid and gaseous media.

 Sealed zippers are known in a wide variety of embodiments. In a construction which most closely resembles the invention, two common commercial zippers are applied against one another, and between these two closures is inserted. a layer of rubber provided at the front with a strip forming a seal which is connected, along a line or a surface, to the zippers. This embodiment guarantees simple manufacture of waterproof zippers; however, it has the disadvantage that the sealing function is no longer ensured in the event of mechanical load or more particularly of differential pressure. This is due to the fact that the elements forming a seal are not compressed against each other. that on a plane, that is to say a horizontal plane, and that, in particular in the case of a vertical load, the elements can deviate.

In addition, the assembly by wire between the strap and the spiral is very unstable and gives way under the effect of mechanical loads. Thus, the sealing of such a zipper decreases in proportion to the load.

The state of the art is presented by patents
DE OS 1 926 513 and DE OS 2 205 494.

 The object of the invention is to manufacture, at reduced prices, a sealed zipper which withstands conditions of high pressure or depression, but also dynamic load.

 The object of the invention is to produce, using two commercial zippers placed one against the other, elements forming a joint comprised between the two zippers so that these elements are under tension. on the other hand in the closed state with or without load and so as to oppose a medium exerting the load.

 The problem is solved, according to the invention, by the fact that the closure members assume a predetermined inclined position in the open state, that the sealing elements are applied in a relaxed manner against the closure members, that the assembly by wire with the straps is in abutment against the rear return points of the closing members and that the sealing elements are larger by their volume than the empty space delimited by the Cubans of the closing members in the closed state and by the closing members in horizontal position and that the opening angle is between 10 and 30.

 An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing.

 Fig. 1 is a top view of the zipper according to the invention.

 Fig. 2 is a cross section of FIG. 1 in the open state of the zipper.

 Kg. 3 is a cross section of FIG. 1 in the closed state of the zipper.

 The waterproof zipper is constituted by a chain of upper closing members 1 and by a cat of lower closing member 2. These two chains of closing members are each joined by a vulcanized left sealing element 9 and by a right sealing element 10. The closure members 5,6 are sewn on a strap 3, 4 by a thread assembly 7, 8 and pushed against the return point 13. Thus, the thread assembly 7, 8 is located at each outer end of the stitches return 13 of the closing members 5, 6. This guarantees that a flexibility stability between the closing members 5, 6 and the sealing elements 9, 10 is obtained by means of the assembly by wire 7, 8 and thus a modification of the position of the sealing elements 9, 10 is made impossible by the application of a load.

 Fig. 2 shows the sealed zipper in the open state. It is recognizable that the closing members 5, 6 have the predetermined inclined position and that the sealing elements 9, 10 also adapt to the relaxed situation.

 Fig. 3 shows in section and in the closed state the waterproof zipper. It recognizes that the closing operation of the zipper has modified the inclined position of the closing oranges 5, 6 to bring them into position parallel to the plane of the zipper, this operation having caused a reduction in the volume of the The sealing space and a compressive stress is caused on all sides in the sealing space.

Claims (2)

 1 - Watertight slide fastener, consisting of two slide fasteners applied one against the shaft, between which sealing elements are inserted, characterized in that the closing oranges (5,6) have an inclined position pre-determined in the open state, in that the sealing elements (9,10) are applied in a relaxed manner to the closing members (5,6),  in that the assembly by wire (7,8) with the straps (3,4) is in abutment at the rear return points (13) of the closing members (5,6) and in that the sealing elements (9,10) are larger in volume than the empty space delimited by the chains of closing members (1,2) in the closed state and by the closing members (5,6) in a horizontal position.  2 - Watertight slide fastener according to claim 1, characterized in that the opening angle (14) is between 10 and 30.