RETRACTOR FOR SEAT BELT.

摘要

Locking means for a seat belt retractor having an emergency locking mechanism for locking a webbing being pulled out at the time of car emergency. This locking means for a retractor comprises a rachet wheel (16) and a pawl (32) comprising in turn two teeth. The pawl and rachet wheel are designed to be located relative to each other such that only one of the two teeth of the pawl is brought into engagement with one of the teeth of the rachet wheel with a gap provided between the other tooth of the pawl and a tooth of the rachet wheel that confronts the same tooth when a load applied to the webbing is small, while the two teeth of the pawl are brought into engagement with the teeth of the rachet wheel when a load applied to the webbing is great. Therefore, since a load applied to one of the teeth becomes a half of a load that would be applied to an engaging pawl having a single tooth, the pawl of the present invention can bear double the torque, and the outside diameter of the rachet wheel can be reduced.