Garage door opening device

Claim 1

IN A DOOR ASSEMBLY FOR A GARAGE OR THE LIKE, WHEREIN A DOOR IS MOVED BETWEEN A CLOSED POSITION AND AN OPEN POSITION, A MOTOR, AN ELONGATED OPERATING MEMBER, MEANS OPERATIVELY CONNECTING SAID MOTOR WITH SAID OPERATING MEMBER, SAID CONNECTING MEANS BEING CONSTRUCTED TO OBTAIN A DECOUPLING BETWEEN THE MOTOR AND THE OPERATING MEMBER UPON THE IMPOSITION OF A PARTICULAR LOAD TO THE CONNECTING MEANS TO PROVIDE AN OPERATION OF THE MOTOR INDEPENDENTLY OF THE OPERATING MEMBER, A PAIR OF LIMIT MEANS AT LONGITUDINALLY SPACED POINTS ON SAID OPERATING MEMBER, CIRCUIT MEANS INCLUDING A STOP SWITCH FOR SAID MOTOR, AND MEANS RESPONSIVE TO THE PARTICULAR LOAD ON SAID CONNECTING MEANS TO OPEN SAID STOP SWITCH FOR A PROTECTION OF THE MOTOR FROM OVERLOAD AND RESPONSIVE, AT A POSITION OF THE DOOR JUST PRIOR TO THE OPEN AND CLOSED POSITIONS OF THE DOOR, TO MOVEMENT OF AT LEAST ONE OF SAID PAIR OF LIMIT MEANS ONLY TOWARD THE OPEN AND CLOSED POSITIONS OF THE DOOR TO STOP THE MOTOR WHEN THE DOOR APPROACHES ITS OPEN AND CLOSED POSITIONS.