Abstract: A track tensioning system for maintaining a substantially uniform tension on the endless track of a track-propelled vehicle is disclosed herein. The track tensioning system comprises first and second walking beam pivotally mounted on respective lateral sides of a vehicle frame. The first walking beam includes two wheel support assemblies and the second walking beam comprises one wheel support assemblies. The two walking beams are linked through a pivot positioned above a hypothetical line passing through the center of the wheel support assemblies, resulting in an increase or decrease of the effective length of the second walking beam to maintain the tension on the endless track substantially uniform. The effective length of the second walking beam is increased when the vehicle passes over a concave surface and the effective length of the second walking beam is decreased when the vehicle passes over a convex surface.

Abstract: A track tensioning system for maintaining a substantially uniform tension on the endless track of a track-propelled vehicle is disclosed herein. The track tensioning system comprises first and second walking beam pivotally mounted on respective lateral sides of a vehicle frame. The first walking beam includes two wheel support members and the second walking beam comprises one wheel support member. The two walking beams are linked through a pivot positioned above a hypothetical line passing through the center of the wheel support assemblies, resulting in an increase or decrease of the effective length of the second walking beam to maintain the tension on the endless track substantially uniform. The effective length of the second walking beam is increased when the vehicle passes over a concave surface and the effective length of the second walking beam is decreased when the vehicle passes over a convex surface.

Abstract: This invention defines a suspension arrangement for off-highway vehicle that comprises a front pair or walking beams, a rear pair of walking beams, each beam pivoted to the vehicle underframe, articulated joints connecting the rear end of the front beam to the front end of the rear beam to allow up-and-down relative pivoting between the front beams and the rear beams, wheel axles and wheels at the outer end of each beam and at the articulated joints to form a three-axle arrangement, one pair of walking beams being extendible and retractable in length for allowing pivoting of the pairs of walking beams relative to the vehicle chassis, the pivot for one pair of walking beams being preferably positioned higher than the other to accommodate endless tracks of constant length around the wheels on the opposite sides of the vehicle, irrespective of the pivoted positions of the beams, and the transverse pivots for the walking beams have outer end portions projecting a predetermined length from the underframe to carry

Abstract: The device serves to convert rotary motion to hydraulic pressure and vice versa. A piston assembly is entirely located within a cylinder, including a piston head and a piston stem fixed to the piston head. The piston assembly divides the cylinder into two distinct variable volume chambers to be filled with a fluid. The piston assembly is prevented from rotating relative to the cylinder. A rotary shaft extends through one closed end of the cylinder and has an inner portion in telescopic and threaded engagement with the piston stem. Two fluid ports communicate with the respective chambers for allowing a fluid to alternatively exit from and enter into the chambers. Rotation of the shaft causes longitudinal displacement of the piston assembly relative to the cylinder or vice versa. The device can have different applications: for instance, if a throttle valve is connected across the two ports, controlled braking of the shaft rotated by an external torque, is obtained.