Abstract: A back rest assembly (22) including a back shell (24), a back rest cushion (26), and a mounting assembly (28) for securing back shell (24) to upright posts (16, 18) that form part of the frame of a wheelchair (10). Mounting assembly 28 includes a mounting block (30), a pair of resilient pads (32), a fastener band (34), a barrel nut (38), and a pivot pin (36). Mounting assembly (28) pivotally supports back shell (24) between upright posts (16, 18) at two pivot points on the posts. Mounting assembly (28) is adjustably secured on each post (16, 18) so that the pivot points can be positioned to align with a person's pelvis.

Abstract: A quick release seat assembly (10) including a seat (11) having a seat cushion (12) and a seat frame (14), and a frame (16), wherein a pair of front seat mounts (18) support the front of seat (11) and a pair of rear seat mounts (20) support the back of seat (11). A pair of overlapping tabs (38, 42) are associated with rear seat mounts (20) and a pair of upstanding locking pins (32) and corresponding coupling mechanisms (50) are associated with front seat mounts (18). Each coupling mechanism (50) includes a releasable latch that engages the upstanding locking pin (32) and holds seat (11) on frame (16). A common pull cord (54) jointly releases the latches in order to allow removal of the seat.