Non-return, direction of rotation selecting device for synchronous motor

Claim 1

A non-return device for a synchronous motor comprising a rotor supported between two brackets and having no preferential rotational direction per se, an eccentric on the rotor axis, an arm mounted on said eccentric through one of its ends, a contact plug or crank pin disposed at the other end thereof, a groove or port disposed in a bracket so as to receive said contact plug, said grOove comprising thrust bearing means for said contact plug for one direction of rotation of the motor, said groove or port being rectangularly shaped and being radially oriented in the bracket, said device further including a movable member means which may take up two positions so as to occupy one or the other corner of said rectangular groove, said corners being opposite said eccentric with respect to the groove, said movable member means marking off, in the groove, for the arm contact plug, a free space shaped as an L whose cross-wise branch is oriented at will so as to compose one rotational direction over another.