Controlled torque, self-energizing wrap spring clutch or brake

Claim 1

THE COMBINATION WITH TWO RELATIVE ROTATABLE ELEMENTS IN CONCENTRIC RELATION, OF MEANS OF LIMITED TORQUE CAPACITY FOR COUPLING SAID ELEMENTS AND COMPRISING A WRAP SPRING HAVING COILS INTERPOSED BETWEEN SAID ELEMENTS AND IN PERIPHERAL FRICTION BEARING ENGAGEMENT WITH ONE OF SAID ELEMENTS, A CONCENTRIC CALIPER LOAD LIMITING SPRING HAVING A STOP PORTION ANCHORED TO THE OTHER OF SAID ELEMENTS, AN END OF SAID CALIPER SPRING BEING FREE, THE FREE END OF THE CALIPER SPRING BEING ENGAGEMENT WITH ONE END OF SAID WRAP SPRING AND ADAPTED TO YIELD IN RESPONSE TO TORQUE TO WHICH THE WRAP SPRING IS SUBJECT, AND MEANS IN THE PATH OF THE OTHER END OF THE WRAP SPRING IN THE DIRECTION IN WHICH THE FIRST SAID ELEMENT YIELDS IN RESPONSE TO TORQUE WHEN THE WRAP SPRING DEFLECTS SAID FREE END OF THE CALIPER SPRING, THE WRAP SPRING BEING HOUSED BETWEEN SAID ELEMENTS, THE ANCHORED STOP PORTION OF THE CALIPER SPRING COMPRISING AN END THEREOF OPPOSITE ITS SAID FREE END, THE SAID ONE END OF THE WRAP SPRING BEING CONFINED BETWEEN THE TWO ENDS OF THE CALIPER SPRING.