Vehicle seat suspension unit

A vehicle seat suspension unit including:

• a base frame mountable on a vehicle;
• a seat support frame to mount a vehicle operator's seat;
• a scissor arms assembly interconnecting the frames to enable the frames to move relative to each other substantially in parallelism;
• a pair of cam track means for controlling relative movement of the frames, each pair including a first cam track on the scissor arms assembly and an associated second cam track on one of the frames;
• a respective cam follower means for engaging the first and second cam tracks of each respective pair;
• a follower support means for mounting the cam follower means for engagement with the first and second cam tracks of each pair;
• and
• a spring means interconnecting the follower support means and the scissor arms assembly or one of the frames for urging the follower support means in a direction for engagement of the respective cam follower means with the respective first and second cam tracks of each pair;
• such that as the frames move relatively towards each other from an initial position, the cam follower means travel along the cam track means to extend the spring means with the extension of the spring means opposing the movement of the frames from the initial position to provide insulation from shock and vibration between the frames.