Bistable motor reversing circuits

Claim 1

A BISTABLE CIRCUIT COMPRISING IN COMBINATION FIRST AND SECOND TERMINALS FOR CONNECTION TO A SOURCE OF DIRECT CURRENT SO AS TO BE OF RELATIVELY NEGATIVE AND POSITIVE POLARITY IN USE RESPECTIVELY, THIRD AND FOURTH TERMINALS HAVING A REVERSIBLE ELECTRIC MOTOR CONNECTED THEREBETWEEN, A SHAFT DRIVEN BY SAID MOTOR, FIRST AND SECOND P-N P TYPE TRANSISTORS HAVING THEIR EMITTERS CONNECTED TO THE SECOND TERMINAL AND THEIR COLLECTORS CONNECTED TO THE THIRD AND FOURTH TERMINALS RESPECTIVELY, THIRD AND FOURTH N-P-N TYPE TRANSISTORS HAVING THEIR EMITTERS CONNECTED TO THE FIRST TERMINAL AND THEIR COLLECTORS CONNECTED TO THE THIRD AND FOURTH TERMINALS RESPECTIVELY, A PAIR OF RESISTORS INTERCONNECTING THE BASES OF THE FIRST AND THIRD TRANSISTORS, A POINT INTERMEDIATE THE RESISTORS BEING CONNECTED TO THE COLLECTORS OF THE SECOND AND FOURTH TRANSISTORS, AND A FURTHER PAIR OF RESISTORS INTERCONNECTING THE BASES OF THE SECOND AND FOURTH TRANSISTORS, A POINT INTERMEDIATE THE FURTHER PAIR OF RESISTORS BEING CONNECTED TO THE COLLECTORS OF THE FIRST AND THIRD TRANSISTORS, THE ARRANGEMENT BEING SUCH THAT, IN USE, THE CIRCUIT CAN BE SWITCHED, BY SUITABLE SIGNALS APPLIED TO THE TRANSISTORS, BETWEEN ONE STABLE STATE IN WHICH THE FIRST AND FOURTH TRANSISTORS ARE CONDUCTIVE AND CURRENT FLOWS BETWEEN THE THIRD AND FOURTH TERMINALS TO DRIVE THE SHAFT IN ONE DIRECTION, AND A SECOND STABLE STATE IN WHICH THE SECOND AND THIRD TRANSISTORS ARE CONDUCTIVE AND CURRENT FLOW BETWEEN THE FOURTH AND THIRD TERMINALS TO DRIVE THE SHAFT IN THE OPPOSITE DIRECTION, THE CIRCUIT FURTHER INCLUDING A TRANSISTOR HAVING ITS COLLECTOR AND EMITTER CONNECTED TO THE THIRD AND FOURTH TERMINALS RESPECTIVELY AND ITS BASE CONNECTED TO EITHER THE THIRD OR THE FOURTH TERMINAL DEPENDING ON WHETHER, A P-N-P OR AN N-P-N TRANSISTOR IS EMPLOYED, AND A SWITCH IN THE COLLECTOR-EMITTER CIRCUIT TO THE TRANSISTOR, SAID SWITCH BEING OPERABLE BY THE MOTOR SO AS TO BE CLOSED WHEN SAID SHAFT IS IN A REST POSITION.