GB752602A - Improvements in lock slider for zipper fasteners - Google Patents

Abstract

752,602. Sliding clasp fasteners. SCOVILL MANUFACTURING CO. July 7, 1954, No. 19907/54. Class 44. A slider 14 for a sliding fastener comprises front and back wings 16, 17 united at one end by a neck 18, the wings having edge flange, which together with the neck form a Y-shaped chan. nel through which the fastener elements pass in open ing or closing the fastener a rigid hollow cap member 26 attached to the front wing 16 and having a front wall 27 spaced from the wing and side walls 27a bearing against the outer surface of the wing, the side walls having a pair of transversely aligned openings 34, a pull tab 15 having arms straddling the cap, a pintle integrally joining the arms and extending through the openings 34, the front wing having an opening 28 therethrough under the pintle, a locking member 29 loosely fitting in the opening 28 and movable into the slider channel for looking engagement with the fastener elements and having a flat cam-engaging surface 30 parallel to the outer surface of the front wing, a second cam-engaging surface 35 on the front wall of the cap opposite the pintle, extending at least in its lengthwise direction, parallel to the outer surface of the wing, a double-lobed cam 23 on the pintle under the cap extending beyond the planes of the pull tab in both directions and the length of which transversely of the pull tab is substantially greater than the distance between the camengaging surfaces in the normal unlocked position of the locking member 29, the two lobes 24, 25 of the cam acting between the two cam-engaging surfaces 30, 35 to force the locking member 29 into the slider channel into firm engagement with the fastener elements therein, the cam, in locked position, entering partially into the opening 28 in the front slider wing to push the locking member 29 to the point where its cam-engaging surface 30 is inwardly of the front wing surface. As shown, the pull tab 15 is formed from a flat blank having a lug which is twisted to provide the cam 23. In the locking position shown, the fastener elements are engaged in a recess 36 provided in the back wing 17 of the slider.