Abstract: An improved split suspension seat cushion maintains the differing elevation response of a conventional split suspension seat to unequal loading, while evening out the differing reactive upward forces that occur between sides of a conventional split suspension. The left and right suspension mats of the embodiment disclosed, which stretch in response to loading to create an upward reactive forced, are joined to one another at the back through a short sliding cable. In response to an imbalance in a previously balanced and even loading, one side is able to sink down without significantly increasing its stretch, while the other side is able to rise up without significantly decreasing its stretch, thereby maintaining an even loading side to side.

Abstract: A seat includes a plurality of flexible belts, each extending in a loop about a fixed tubular member and an opposed rotatable tubular member, the tubular members being mounted in a seat frame. A pair of spaced extensible outer support arms are associated with each belt. Each pair of outer support arms is pivotally mounted on one end to rotatable support shafts on the seat frame and have upper ends slidably disposed in a belt loop to engage the points of contact between the top and bottom surfaces of a belt loop on opposite sides of a user of the seat. The belts and outer pivotal support arms are releasably latchable in the conformed position about a user. Pivotal inner leg support arms are coupled to an endmost pair of outer support arms to conform the inner portions of an endmost belt about a user.