Actuator for retractable wall

Claim 1

FOR USE IN RAISING AND LOWERING A FLEXIBLE RETRACTABLE WALL THAT IS WOUND AND UNWOUND FROM A ROLLER, THE COMBINATION COMPRISING AN OUTPUT SHAFT, MEANS FOR JOURNALLING THE OUTPUT SHAFT IN POSITION ADJACENT ONE END OF THE ROLLER FOR A DRIVING ENGAGEMENT WITH THE ROLLER, A PLASTIC GEAR ROTATABLY MOUNTED ON SAID OUTPUT SHAFT, A REVERSIBLE ELECTRIC MOTOR, MEANS INTERENGAGING SAID ELECTRIC MOTOR AND SAID GEAR, CLUTCH MEANS BETWEEN SAID OUTPUT SHAFT AND SAID GEAR, TRAVELING NUT ON SAID OUTPUT SHAFT, A SWITCH ARM PIVOTED FOR ENGAGEMENT AND SWINGING MOTION WITH THE MOVEMENT OF SAID TRAVELING NUT, A PAIR OF CONTACTS, SAID CONTACTS BEING ALTERNATELY ACTUATED BY SAID SWITCH ARM TO ALTERNATELY CONTROL THE MOVEMENT OF THE ELECTRIC MOTOR IN THE TWO DIRECTIONS OF DRIVE, EACH OF SAID PAIR OF CONTACTS BEING ADJUSTABLE INDEPENDENTLY OF THE OTHER, SAID CLUTCH MEANS COMPRISING A DIAMETRAL PIN IN SAID OUTPUT SHAFT HAVING A NON-CIRCULAR CROSS-SECTION AND RADIAL SLOTS IN SAID GEAR, AND A SPRING ARM ENGAGING SAID YIELDINGLY URGING SAID CROSS PIN INTO ENGAGEMENT WITH SAID GEAR, SAID SPRING BEING ADAPTED TO BE MANUALLY UNTENSIONED AND TO BE MANUALLY TENSIONED AND THEREBY REMOVE THE YIELDING FORCE ON SAID PIN.