Slide fastener

An invisible-type slide fastener chain comprising

• a pair of mounting tapes disposed adjacent each other with respective longitudinal portions extending from the inner edges of the tapes being folded back underneath the tapes;
• a pair of pluralities of thermoplastic slide fastener elements molded on the folded-back portions of the respective tapes;
• said fastener elements each having a main body beneath the folded-back portion, a leg extending upward from the main body past the inner edge of the respective tape and over the respective folded-back portion inside the fold formed thereby, a neck extending from the front of the main body, and a head member joined by the neck in front of the main body;
• each of said head members having a front shelf formed on the front edge thereof and extending parallel the tapes;
• said front shelf being in the form of a ledge cut into the upper portion of the front of the head member;
• each of said main bodies having a rear shelf formed on the front edge thereof and extending parallel the tapes for engaging a portion of the front shelf of an element on the opposite tape;
• said rear shelf being in the form of an extension of the upper portion of the main body adjacent both sides of the neck;
• each of said head members further having rear engaging surfaces on opposite sides of the neck;
• and
• said engaging surfaces being perpendicular to the tapes and extending continuously through the full width of the head member for engaging the engaging surfaces of elements on the opposite tape.