Patent ID: 7845725

Claim:
An apparatus comprising: a pair of parallel backbone members comprising first and second backbone members separated by a gap therebetween; a support leg in sliding engagement with the pair of parallel backbone members along said gap, the support leg comprising opposing first and second surfaces wherein the first surface matingly contacts the first backbone member and the second surface matingly contacts the second backbone member; a unitary combination seating surface and backrest portion in sliding engagement with the pair of parallel backbone members and adjacent the support leg; and an end cap secured to each of the pair of parallel backbone members and restricting lateral motion of the support leg and the combination seating surface and backrest portion, wherein upon removal of the end cap both the support leg and the combination seating surface and backrest portion are free to slide laterally along the pair of parallel backbone members, and wherein the end cap is separate and distinct from both the support leg and the unitary combination seating surface and backrest portion, said end cap further forms no portion of an arm rest which attaches directly to said unitary combination seating surface and backrest portion.