Abstract: A rotary stepper actuator having a rotatable output shaft provided with a cam portion fixedly secured thereto and engaged by a plurality of pairs of oppositely acting fluid pressure responsive pistons wherein each pair of pistons is movable along an axis intersecting the axis of the shaft. Preferably, the pistons are arranged in circumferentially spaced apart formation around the shaft and provided with roller elements adapted to bear against the cam portion the periphery of which takes the general form of an ellipse having opposite depressed mid portions. The applied piston forces acting through the rollers against the peripheral edge of the crank portion produce a force couple tending to rotate the shaft to the extent that the rollers become engaged with the opposite depressed mid portions whereupon the couple becomes reversed preventing further rotation of the shaft.

Abstract: A fluid pressure transducer device including first fluid pressure responsive means and second fluid pressure responsive means which together define a sealed volume of fluid. The first fluid pressure responsive means is exposed to first and second input fluid pressures and responsive to variations in one or both thereof to vary the volume of the sealed volume as a function of the first input fluid pressure modified by the pressure ratio of the second input fluid pressure to the first input fluid pressure. The second fluid pressure responsive means is responsive to the changes in the sealed volume of fluid and produces an output force signal in response thereto. There may be provided a variable volume chamber containing a temperature responsive element vented to the sealed volume of fluid to cause an increase or decrease in the sealed volume to compensate for temperature variations of the sealed volume of fluid.

Abstract: An automatic brake adjust and reset device particularly adapted for use in a multiple disc aircraft disc brake and having one or more spring loaded axially movable tubular members engaged by a movable cutting member connected to and actuated by a brake applying pressure plate. A pair of spaced apart fixed stops operatively connected to the tubular member serve to limit axial movement thereof to a brake released position under the influence of the spring load thereon and to a brake applying position under the influence of the brake applying pressure plate connected to the cutting member. The tubular member is fixed at the brake applying position whereupon continued movement of the pressure plate and cutting member attached thereto results in cutting or slitting of the tubular member by the cutting member to the extent necessary to compensate for axial wear of the multiple brake discs.