Patent ID: 7571886

Claim:
A seat suspension apparatus adapted to be attached to a mounting deck of a vehicle, said apparatus comprising: (A) a lower frame comprising a pair of longitudinal side members, (B) four pivot members structurally attached and extending upwardly from the side members of the lower frame, (C) four bellcrank members disposed to pivot in vertical planes, each bellcrank member comprising: (i) a median pivot section each pivotally connected to a distal end of the four pivot members, (ii) an upper bellcrank arm comprising a distal end, and (iii) a lower bellcrank arm comprising a distal end, (D) an upper seat cushion frame pivotally connected to the distal ends of the four upper bellcrank arms, and (E) spring biasing means pivotally connected to the distal ends of the four lower bellcrank arms to provide spring biasing against downward movement of the seat cushion frame, wherein, when the upper seat cushion frame is depressed, the median pivot sections of the bellcrank members extend above an upper edge of the upper seat cushion frame and the distal ends of the lower bellcrank arms rotate to a height below a lower edge of the lower frame.