Abstract: An all-terrain vehicle driven by endless propulsion tracks. The wheels are sufficiently bouyant to maintain the upper section of the endless track above the water line when the vehicle is fully loaded. A series of generally linear cleat segments project from the outer surface of the endless track and extend substantially across the width of the track. The cleat segments are arranged in a zig-zag pattern about the length of the endless track in order to provide a combination of forward and lateral thrust components as the endless track is rotated about the wheels. The generally longitudinal character of the cleat pattern reduces the chance of mud and loose soil being carried on the cleats to the top portion of the endless track. In one embodiment of the invention, four pneumatic tire wheel assemblies are provided in longitudinally spaced relation along each side of the vehicle and a pair of endless tracks, each trained around two adjacent wheel assemblies, are provided on each side of the vehicle.

Abstract: An all-terrain vehicle driven by endless propulsion tracks. The wheels are sufficiently bouyant to maintain the upper section of the endless track above the water line when the vehicle is fully loaded. A series of generally linear cleat segments project from the outer surface of the endless track and extend substantially across the width of the track. The cleat segments are arranged in a zig-zag pattern about the length of the endless track in order to provide a combination of forward and lateral thrust components as the endless track is rotated about the wheels. The generally longitudinal character of the cleat pattern reduces the chance of mud and loose soil being carried on the cleats to the top portion of the endless track.

Abstract: A steady rest is disclosed for alternatively supporting the interanl and external surfaces of a tubular workpiece during a machining operation. Each outer end of a plurality of movable fingers includes first and second workpiece contact devices such as rollers. The second contact device is offset from the longitudinal axis of the finger so that it may engage the inner periphery of the workpiece. The opposite inner ends of the outer fingers ride in slots having opposing arcuate cam surfaces. One cam surface provides backup support for its finger when externally contacting the workpiece while the other cam surface insures stability when its finger is contacting the inner periphery of the workpiece.

Abstract: An auxiliary support device for a workpiece is connected to a bracket mounted on a side face plate of a steady rest. The support device includes a member extending from the end of the steady rest for abutting the workpiece diametrically opposite the machine tool to provide additional backup forces during machining operations. Preferably, provision is made for adjusting the angle of the support device relative to the workpiece and for moving the abutment member in unison with the fingers of the steady rest.

Abstract: The checking fixture includes a pair of opposed gaging fingers drivingly interengaged so as to be moved together to engage a workpiece, with a simplified arrangement for manipulating the position of both the gaging fingers with a single control knob, insuring a uniformly applied gaging pressure for urging the gaging fingers into contact with the workpiece while compensating for eccentric location of the workpiece in the gage. Rotation of a control knob assembly in one direction causes opening of the upper and lower gaging fingers, the assembly allowing a "stay-open" positioning of the gaging fingers in any adjusted open position.