US Patent 8662260 Ball ramp caliper brake

A caliper brake including a housing and a rotating actuator received in a bore in the housing, the rotating actuator having a head positioned within the housing and an outer tapered surface located outside the housing. A lever includes a bore with an inner tapered surface that mates with the outer tapered surface of the rotating actuator. A threaded nut is received over a threaded end portion of the rotating actuate and applies pressure to the lever to rotationally secure it to the rotating actuator. An inner stator is positioned adjacent to the head of the rotating actuator and an outer stator is spaced from the inner stator, the stators being axially movable. A plurality of ramped depressions are provided in both the head and in a backing plate of the inner stator, and a ball is positioned between each of the ramped depressions.