Handwheel for maneuvering e.g. valves, shutters, taps, has elastic ring and washer that are housed by cylindrical step-like seats

摘要

A cavity (2A) of a stem (2) for cooperating with an end of a shaft ends outwardly in two cylindrical step-like seats in the proximity of the open edge. The seats house an elastic ring (5) and a washer (6). The washer retains the elastic ring.