Rotational direction detecting switch and seat belt retractor with rotational direction detecting switch

Abstract

A rotational direction detecting switch detects a rotational direction of a shaft, preferably of a seat belt retractor. The detecting switch is formed of a switch plate having a support portion for pivotally supporting the switch plate and restricting members spaced apart from each other for restricting a rotating angle of the switch plate, a spring member attached to the switch plate between the restricting members for elastically contacting an outer circumference of the shaft, and a switch situated near the switch plate for detecting a rotating position of the switch plate. Since the spring member is used to contact the shaft, the elastic deformation is large. Therefore, tolerance in manufacturing the switch plate can be large, so that its assembling accuracy may not be so accurate. However, the rotating direction can be positively detected.

Dependencies are inferred from the claim text.