End stop member for sliding clasp fasteners

Claim 1

In a sliding clasp fastener of the type which comprises a pair of oppositely disposed stringer tapes each carrying along their respective longitudinal edges a row of interlocking fastener elements made of a continuous plastic filament and a slider having side flanges and mounted on the fastener for reciprocal movement along said longitudinal edge, the improved bottom end stop member for restricting the movement of the slider which end stop member is formed of a thermoplastic material and which consists of a central body adhesively covering a plurality of interengaged fastener elements and having shoulders laterally projecting for abutting engagement with the side flange ends of the slider, further engaged fastener elements extending beyond the ends of said central body first reduced or thinned out foil portions longitudinally extending on opposite sides of said body and adhesively bonded to the respective stringer tapes, and second reduced or thinned-out foil upper and lower portions extending laterally on opposite ends of said body and downwardly stepped so as to lie below the surface of said body thereby preventing the upper portion from coming into abrasive contact with the slider, said central body being completely circumferentially surrounded by said first reduced portions and said second reduced foil upper and lower portions, and said second foil upper and lower portions being fused to said further fastener elements to form a unitary body with said end stop member and said interengaged fastener elements.