Automatic lock slider

An automatic lock slider for a slide fastener comprising:

• a. a slider body having a pair of parallel, spaced-apart upper and lower wings interconnected by a neck located centrally of its front end to define a generally Y-shaped guide channel through said slider body for the longitudinal passage of rows of slide fastener elements, said slider body having a slot extending through said upper wing and oriented transversely to the longitudinal centerline of the slider body;
• b. a pull tab having a tongue at one end and mounted on said upper wing for pivotal movement relative thereto between flat and uplifted positions;
• and
• c. a resilient locking spring means mounted on said upper wing, said locking spring means having a locking pawl at one end received in said transverse slot, said locking spring means resiliently engaging said pull tab tongue for operation thereby, said locking spring means responsive to the pivotal movement of the pull tab whereby the locking spring means twists about an axis parallel to the longitudinal centerline of the slider body to sweep said locking pawl along a curved path oriented transversely to said axis, said locking pawl being extended into said guide channel for locking engagement with the fastener elements when the pull tab is in said flat position, and said locking pawl being retained in said slot out of locking engagement with the fastener elements when the pull tab is in said uplifted position.