Mechanical seat suspension with multiple position, lift-type height

Abstract

A mechanical seat suspension between upper and lower supports comprises a scissors arms linkage and a support pivot assembly allowing height adjustment to multiple positions. The pivot assembly carries most of the seat load and comprises a pair of lever arms, a pair of bell cranks, a height adjustment latch including multiple height adjustment detents, a pair of latch supports and a pair of tension springs to provide height-adjustable suspension. The seat suspension also preferably includes a damper such as a shock absorber. The latch includes a plurality of detents which alternatively work to adjust the height of the seat. A moveable pin is disposed within the latch support to engage a detent of the latch to establish the adjustable height of the seat. The moveable pin is moved into a disengagement position by lifting the seat to its maximum raised position whereby an abutment surface on the latch forces the moveable pin rearward. The upper support is then free to travel to its lowest position where a second abutment surface on the latch forces the moveable pin into its engagement position. In this position, the seat can be placed into multiple height-adjusted positions by raising the upper support to its preferred position. The invention allows for a multiple-position height adjustment and independent weight adjustment while allowing a very low profile and a linear suspension curve.