Toggle type web lock

Claim 1

In a toggle type seat belt webbing lock structure, the combination comprising: a channel shaped frame having upstanding parallel spaced-apart legs and the legs thereof defining plural pairs of aligned and juxtaposed butterfly shaped openings; a spreader bar intermediate said legs; a pivot bar in each of said butterfly slots and transversely across said channel shaped frame; a pair of juxtaposed clamp blocks in spaced-apart parallel relation between said legs of said frame, each having spaced-apart grooves forming outer pockets for operative engagement with edges of said extending pivot bars and said clamp blocks having registering depressions in the facing portions thereof; inserts of slightly deformable material with excellent memory characteristics, each retained in said depressions in said clamp blocks and having work faces projecting outwardly toward a registering and facing insert; a spring bias connected to each of said clamp blocks and urging them away from each other and limited by said butterfly openings; guide links coordinating movement of all of said bars and operably connected over at least a pair of the ends of said pivot bars; means selectively actuatable in a motion generally parallel to a plane between said clamp blocks, said motion displacing said clamp blocks and closing said blocks toward each other on said guide links; and a web belt movable between said blocks in a plane parallel generally to the actuatable means and engaged by said inserts as said clamp blocks close toward each other, the direction of pull thereafter urging a tighter grip by said inserts on said web belting.