Directional drive control for synchronous reaction motor

Claim 1

IN A SELF-STARTING SYNCHRONOUS MOTOR, THE COMBINATION WITH A FIELD STRUCTURE INCLUDING A FIELD COIL, AND A PERMANENT-MAGNET ROTOR STARTING AND RUNNING IN EITHER DIRECTION ON ENERGIZATION OF SAID COIL, OF A DIRECTIONAL DRIVE CONTROL HAVING A FIRST ROTOR-DRIVEN PART WITH A ROTARY AXIS AND A SECOND PART, OF WHICH ONE PART HAS ABOUT SAID AXIS A GENERALLY SPIRAL CAM EDGE WITH LOW AND HIGH POINTS SPACED SUBSTANTIALLY 360 DEGREES APART AND A SUBSTANTIALLY STRAIGHT EDGE CONNECTING SAID POINTS AND SERVING AS A SHOULDER, AND THE OTHER PART HAS TWO SPACED CAM FOLLOWERS ON OPPOSITE SIDES OF SAID AXIS AND IS GUIDED FOR MOVEMENT WITH ITS FOLLOWERS BACK-AND-FORTH TOWARD AND AWAY FROM SAID AXIS, WITH SAID PARTS BEING COORDINATED SO THAT SAID CAM EDGE WILL ON THE ROTOR DRIVE IN CORRECT DIRECTION ENGAGE SAID FOLLOWERS AND MOVE THEM INTO AND FROM ALIGNMENT, RESPECTIVELY, WITH SAID SHOULDER AT SUCH ALTERNATION THAT THEY CLEAR THE LATTER ON EACH PASS, BUT WILL ON THE ROTOR DRIVE IN THE WRONG DIRECTION BE DISENGAGED FROM SAID FOLLOWERS SO THAT SAID SHOULDER AND THE NEAREST FOLLOWER ALIGNED THEREWITH WILL CLASH WITH ENSUING REVERSAL OF THE ROTOR INTO CORRECT DRIVE DIRECTION.