Patent GB-720377-A (GB)
Title: Improvements in sliding fasteners
IPC: A44B19/16
Filed: 1951-12-10
Abstract: 720,377. Sliding clasp fasteners. STEINER, L. Dec. 10, 1951 [Dec. 13, 1950], No. 28890/51. Class 44. A slide fastener comprises a first edge element, a second edge element and a sliding operating member; the first edge element consisting of an elongated strip of material divided into two jaws by a longitudinal opening having on its inside a longitudinally extending recess or channel capable of receiving and retaining in a resilient manner a compensating or locking member; the second edge element consisting of of an elongated strip having along one side or edge an enlargement or ridge formed for engagement with and locking inside the longitudinal recess of the first edge element by the locking member, the first and second edge elements being adapted for affixture at or along the side of an opening or other part of an article to be closed or connected, the sliding member consisting of a hollow frame slidably mounted on the first edge element and containing a guide formation projecting into the longitudinal opening of the first edge element and shaped to engage and operate the locking member and the second edge element. In the arrangement according to Figs. 6 and 7, in which first and second edge elements 1 and 5 are engageable or disengageable by a slider 7, the latter cooperates by means of a guide 8 therein with a ridge 6 on the second element and with a locking member 10 which is loaded by a spring 12 and is located in a channel portion 2 of the first element 1. The locking member 10 may be of flexible material and made in one piece or may be made in a series of short parts, Fig. 5 (not shown). In another arrangement, Figs. 13 and 14, a locking member 10, which may be formed in one piece or in sections, is formed with ridges 11 by which it is located on shoulders 14 within the element 1. The member 10 may be formed with a groove 15 for locating the spring 12. The guide 8 on the slider 7 extends across the underside thereof and includes a chamfered face 16 to actuate the member 10. In the arrangement according to Figs. 20 and 21 the element 5 which may consist of one or more parts, is formed with an additional ridge 17 for location within a housing 18 against a spring 19. The spring loaded locking member 10, preferably formed in sections, normally bears on flanges 14 of the first element 1, the arrangement being that in the closed position of the fastener, the element 5 is retained by the member 10, which is freed to release the fastener by the slider 7, which when moved in either direction lifts the member 10 and pushes the element 5 outwardly of the element 1 against the springs 12 and 19. The fastener is closed by direct engagement of the elements without the use of the slider 7. In a modification, Fig. 23 (not shown) the first ridge on the element 5 may be replaced by a slot into which member 10 engages. In a further arrangement, Figs. 31 and 32, the arrangement is such that movement of the slider 7 in either direction moves the locking member 10 within the element 1 against spring 12, to free the second element 5 which is retained against a spring 19 within a housing 18. The fastener is closed by pressing the two elements together. In a modification Figs. 30 -and 35 (not shown), the element 5 may be so formed as to constitute a combined element and spring, without the housing 18. In another modification Fig. 28 (not shown), the first ridge of element 5 is replaced by an opening in the element and in the closed position of the fastener, is engaged by a lug on the element 1.