Patent GB-1053882-A (GB)
IPC: A44B19/32
Abstract: 1,053,882. Sliding clasp fasteners. G. DOELTER. July 29, 1964 [Feb. 3, 1964], No. 4509/64, Heading E2S. In a sliding clasp fastener of the kind comprising two pieces of flexible material e.g. textile fabric, in the form of tapes or sheets each piece having either a row of fastener elements 5, 6 of which each has a head portion arranged to be engageable except for the end elements in holding relation between or behind the heads of a pair of elements in the other row or a continuous fastener element constructed to engage lengthwise of the element in holding relation with a continuous element on the other piece one or both of the elements being resilient to permit engagement or disengagement, in each case the engagement being effected by movement of a sliding clasp in one direction along the rows or elements, movement of the clasp in the opposite direction effecting disengagement, one of the rows 5 of fastener elements or one of the continuous fastener elements has at each end of the fastener an extension 5a, 5b beyond the other row or continuous element to receive the clasp 3 of the other row or continuous element. In the construction shown the fastener uses the form of elements disclosed in Specification 940,461 in which separate interlocking elements are used which are secured to a pair of tapes and in which each element consists of two parts one part having a shank by which the element is secured to the tape and having a head at the end of the shank and the other part consisting of a U-shaped member the tape being folded round the shank of the first element and received inside the arms of the U and the fold of the tape being arranged round the end of one arm so that the folds of the two tapes abut to provide a substantially fluid tight joint. Each extension, 5a, 5b consists either of normal elements, as shown, or of a rigid or flexible rod or rail. As described the fastener is used for closing an opening in an air cushion, the tape ends being overlapped and secured together by adhesive and rivets 12, 13. The tapes are backed by two sheets or sealing pads 15, 19 cemented to the underside of the tapes and which extend forwardly under the tapes to the lines A and B; these sheets or pads are made of high elasticity Neoprene and prevent air loss from the cushion at the ends of the fastener. Since the two rows of elements are not hold together by the slider in the closed position of the fastener since the slider is on the extension 5a and since no end stop is provided at the opposite end of the fastener, the two rows can separate from the points 16 and 17 when it is subjected to a lateral stress and the backing sheets or pads permit this to take place at a predetermined internal pressure in the cushion. The extension 5b permits the reclosing of the fastener since once the fastener has separated the slider can be moved to the extension 5b and then upon movement in the opposite direction will close the fastener. In a modification the backing sheets or pads are omitted and instead the two portions of the fastener underneath the extensions are covered by sheets 24, 25 (not shown) each of which is held in place by means of six press stud fasteners 26, three for each tape. The sheets 24, 25 are flexible and elastic to enable them, under pressure within the cushion, to be deformed into sealing engagement with the tapes and to enable these tapes to separate under a predetermined internal pressure. In other constructions the ends of the row 6 are secured to the row 5 by U clips which either fracture or open out under load or by a tie which breaks under load. When U clips or ties are employed the sheets 14, 15 or 24, 25 may be replaced by folded pleats or gussets between the two end portions of the tapes so as to seal the end portions while permitting separation. When continuous fastener elements are used these may be in the form of interfitting grooves and beads.