Patent ID: 7353723
Filing Date: 2008-04-08
Classification: F16H,Y10T

Abstract:
1. An actuator for actuating a moving member, said actuator comprising a screw and at least two nuts engaged on the screw, relative movement between the screw and the nuts generating said actuation, said actuator further comprising a pin through which a conductive wire passes, one of the nuts being a force-transmitting element placed in the path of the force between the screw and the moving member, and a shoulder of the one of said nuts that extends to the vicinity of the other nut, the pin passing both through the shoulder and through an element coupled to the other nut so that any abnormal shift in the one of said nut relative to the screw results in shearing between its shoulder and the element coupled to the other nut, causing the pin to break and causing the conductive wire to be broken, wherein the pin includes a spring that operates to generate a parting force on the pin so that the pin breaking by shearing causes two portions of the pin separated by the pin breaking to move apart.