Vehicle seat assembly

Claim 1

A seat assembly for a vehicle, particularly a land vehicle adapted to move over rough ground, said assembly comprising a base adapted to be mounted on said vehicle substantially horizontal when the vehicle is level, and a frame slidingly mounted on the base for up and down movement relative to the base, the sliding frame supporting a back for a passenger, and a seat mounted on the frame for pivotal movement relative to the back about a horizontal axis, said seat having its front part opposite to the back supported by a slanted connecting rod arranged under the seat, an oscillating suspension arm having one end pivotally mounted on the frame below the back, the other end of the suspension arm comprising a bearing roller resting on a surface of the base, resilient means comprising a hydraulic jack and a pressure accumulator acting between the frame and the oscillating arm to apply a suspension force to the latter, to ensure a flexible suspension of the sliding frame with respect to the base, said slanted connecting rod supporting the front part of the seat being hinged on the oscillating arm between the pivotal joint of the latter on the frame, and its bearing roller resting on said surface of the base, said suspension force of the hydraulic jack being applied to the oscillating arm in the vicinity of but offset from the pivotal joint of the latter on the sliding frame.