Opti-holding Ag

Helmut Heimberger

Slide-fastener stringers are made by extruding continuous strands of synthetic resin in a form having a plurality of cavities open on one side and defining the coupling head, shank and connecting portion of a multiplicity of coupling members which together form a coupling element adapted to be mounted along the edge of a support tape. An embossing tool is thrust into the connecting members and/or the shanks of the coupling members so as to plastically deform the thermoplastic material and produce humps along the surfaces of the coupling element which are thermally bonded to the support tape.

Apparatus for making slide-fastener stringers

A preformed multiturn coupling element of the helical-coil or meander type is juxtaposed with a tape and a loop is formed by a stitching thread whose needle is thrust upwardly between each pair of turns. A gripper engages the loop and draws it laterally out of the coupling element to reintroduce it between another pair of turns where it is engaged by another loop thrust through the tape. In one embodiment the thread passes through the tape and an overlying filler cord, its loops being drawn half-way around that cord and being interlinked at points between the cord and the tape.

Growing community of inventors

Grenzach, Germany

Helmut Heimberger