Car safety belt tensioning roller - controlled by pre-torsioned rubber band and ratchet mechanism

摘要

The belt rolls up on a cylindrical drum (5) which is mounted in a holder and is powered by a pre-torsioned rubber band (10). One end of the drum terminates in a castellated flange (7) and has inside it a means of anchoring the rubber band. A ratchet pawl pivots freely on the outside of the holder and is held in mesh with the castellated flange by a tension spring (13). The winding mechanism is actuated by manually releasing the ratchet by lever (22). The pre-torsion of the rubber drive band can be adjusted by a rotatable hook (19). The drum holder has a slot to guide the belt on to the drum.