A first piston (22) of a first locking cylinder (20) descends when a pressure of compressed air in an actuation chamber (23) has exceeded a pressure for locking commencement (P1) and ascends by a first spring (24) when the pressure of the compressed air has decreased to a pressure for releasing commencement (P2). A second advancing and retreating cylinder (32) comprises an inlet chamber (41) and an outlet chamber (45) formed below and above a second piston (35), respectively, and a second spring (46). The actuation chamber (23) communicates with the outside air through the outlet chamber (45). A restricting passage (37) is provided in a route between the actuation chamber (23) and the outside air. The actuation chamber (23) communicates with one of the inlet chamber (41) and the outlet chamber (45) through a communication hole (62).

A motion controller for use with a rod (10A, 10B, 10C) has a backlash reducer (88A, 88B, 88C) that substantially reduces or eliminates the space created after manufacturing parts with specified tolerance dimensions to substantially reduce or eliminate backlash. The backlash reducer (88A, 88B) can be in the form of a holder such as an internal retaining ring (78) and a shim (36), a threaded cap (38), or the like to accommodate various part size variances due to manufacturing tolerances. Alternately, the end cap (45) of the motion controller (10C) can have an outside thread (41) that mates to an inside thread (43) of the inside surface (54) of a housing (29). The motion controller (10A, 10B, 10C) has a friction collar (12) to hold the rod (14) under the action of balls (16) and a piston (18). The motion controller (10A, 10B, 10C) can be fluid powered with a fluid such as air.

The present invention is a unique motor comprising a containment chamber having thick walls surrounding a thin wall, is created when a plug is fusible joined. An inlet port and preferably a purging port are located in the thick walls. A motion is created when said expansion wall expands as said containment chamber is pressurized.

A pneumatic collet assembly has a housing, a piston, a collet, and ball bearings. The piston is disposed within the housing. A bore within the piston receives the collet. The collet has a base and fingers. The fingers of the collet define a center channel or bore configured to receive a torsion bar. The central channel extends along a longitudinal axis. The ball bearings are disposed between the piston and the fingers of the collet. The piston is configured to move between a first position along the longitudinal axis and a second position along the longitudinal axis in response to pressure changes within the housing. The piston increases force against the ball bearings to urge the fingers of the collet against the torsion bar to clamp the torsion bar.

A compact, low-profile, in-line beveling tool suitable for use in a confined space, such as a tightly packed array of tubes. The tool is inserted within a workpiece via a feeding mechanism, such as a worm gear arrangement, and is secured to the workpiece via an internal expanding mandrel assembly. A motor drives cutting inserts, mounted on a beveling head, in rotational motion to bevel the workpiece. The motor and beveling head with cutter inserts all share the same axis. A gear reduction box, located between and operatively connected with the motor and beveling head, provides the low RPM and high torque needed to make practical use of carbide insert technology. In one embodiment, the motor is a hollow core air motor having vanes symmetrically arranged about the axis.