BUCKLE PRETENSIONER

摘要

A buckle pretensioner for a vehicle safety restraint comprising a buckle head (1) for receiving a buckle tongue to secure safety restraint webbing about a vehicle occupant in a three-point belt system; a cable (2) connected to the buckle head (1); and means (7) for rapidly withdrawing the cable in a belt tightening direction, the withdrawing means (7) comprising a force reservoir (8), and driving means (6), and being of a compact construction through the use of step-up gearing (3, 4) to magnify linear movement produced by the force reservoir (8) which may be a pyrotechnic gas generator or a spring. The driving means (8) may be a piston-cylinder (6, 8) or a rack and pinion. The gearing may comprise a pulley arrangement (3, 4). Alternatively a roots motor or a gear pump could be used.