Abstract: A slide fastener slider is disclosed, which slider comprises an upper wing and a lower wing constituting a slider body and connected together at one end by a neck or wedge. One of the wings is provided with diverging shoulders, while the other is provided with conversely offset shoulders, resulting in an asymmetric wing structure wherein there is formed an open area on opposite sides of the wedge. This open area serves to reduce the tendency of stringer tapes to become creased or wrinkled as and when they arrive at the entrance end of the slider.

Abstract: A slider for heavy duty slide fasteners equipped with a pair of pull tabs pivotally connected to the upper and lower wings of the slider. At least one of the pull tabs has a locking means situated within the width of the pull tab and movable into a position close to and forward of the slider entrance end to engage a top end stop inserted within the Y-shaped guide channel in the slider. The two pull tabs are further provided with an engaging member and a socket member, respectively, both members being snap fittable with each other when the pull tabs are rotated into the locking disposition thereby preventing the locking means from being accidentally forced out of engagement with the top end stop under severe stresses exerted on and around the slider.

Abstract: An automatic slider lock mechanism including a locking leaf spring arranged longitudinally over the slider body and having a locking pawl at its rear end which normally projects into the usual Y-shaped guide channel in the slider body for interference contact with rows of interlocking fastener elements passing therethrough. The locking leaf spring includes a neck portion directly overlying the top wing of the slider body and having a fold at its front end arranged in parallel spaced relationship thereto. The fold has a pair of arms extending downwardly therefrom into abutting contact with the top wing, and a pair of flanges project laterally outwardly from parts of the bottom edges of the respective arms to be engaged by respective spring retainers on the top wing. The locking pawl retracts away from the guide channel when a pull is exerted on the pull tab of the slider.