Abstract: An adjustable seat leveling mechanism includes a pair of elongated, arcuate and T-shaped rails mounted on a platform which is fixed to a vehicle. A pair of guides have elongated arcuate slots which receive the rails so that the guides, which support a vehicle seat, are laterally movable along an arc of a circle. A toothed rack projects outwardly from one of the guides. A lever is pivotally mounted on the platform and is biased toward engagement with the rack to releasably hold the seat in selected positions. An operating lever is mounted on an arm rest of the seat and is coupled to the lever by a cable linkage.

Abstract: A multi-directional vibration attenuator seat is capable of limited, restrained movement in any direction within a generally horizontal plane in response to vibration and other motions of the seat and the vehicle in which the seat is mounted. The limited movement is made possible by a seat arrangement in which an intermediate assembly is disposed on top of and slidable relative to a base assembly along a first axis with a seat supporting upper assembly being disposed on and slidable relative to the intermediate assembly along a second axis extending in a direction generally perpendicular to the direction of the first axis. The seat is normally maintained in and is restrained from movement out of a nominal position relative to the base assembly by a plurality of springs. A pair of shock absorbers disposed generally perpendicular to each other damp movement of the seat along the first and second axes respectively.