A SAFETY-BELT RETRACTOR MECHANISM

摘要

A safety-belt retractor mechanism incorporates a spool (20) upon which the safety-belt may be wound and a locking system to lock the spool which incorporates a locking head (25), a torsion bar (22) provided, which has one end (23) connected to the spool, and the other end (24) connected to the locking head. The torsion bar comprises a load-limiting device enabling the belt to be pulled out from the spool to a limited extent after the locking system that incorporates the locking head (25) has been locked. The retractor mechanism incorporates means to limit the angle of rotation of the spool (20) relative to the locking head (25) which are located between the locking head and the spool. In one embodiment a string, cord or cable (43) is provided having one end (44) secured to the spool (20) and the other end (45) secured to a projection (42) carried by the locking head. After a predetermined degree of rotation of the spool relative to the locking head, a string, cord or cable (43) is wound tightly around the projection (42) and constitutes a load-transmitting connection between the spool and the locking head which prevents further rotation of the spool relative to the locking head.