Patent ID: 7562896

Claim:
A body frame for a wheelchair comprising: a main frame having a pair of upper bones provided opposite to each other in a transverse direction and extended in a longitudinal direction and a pair of lower bones provided in parallel with the upper bones below the upper bones; a seat frame having a pair of seat rails provided along the upper bones and constituting a seat by an attachment of a seat member; a back frame having a pair of back rails provided on rear ends of the upper bones and constituting a back by an attachment of the seat member; a cross brace including a pair of cross members, one of the cross members having a pair of ends, one of the ends coupled to a predetermined portion of one of the seat rails and the other end coupled to a predetermined portion of one of the lower bones and the other cross member having a pair of ends, one of the ends coupled to a predetermined portion of the other seat rail and the other end coupled to a predetermined portion of the other lower bone, the mutual cross members being coupled rotatably in centers thereof and being thus formed like X; and a support structure for supporting the seat frame with respect to the main frame in order to maintain a positional relationship of the seat frame with the main frame, each of the upper bones being divided into a fore upper bone and a hind upper bone and the hind upper bone being coupled to the fore upper bone through a first hinge structure in order to be freely inclined to the fore upper bone, each of the seat rails being divided into a fore seat rail and a hind seat rail and the hind seat rail being coupled to the fore seat rail through a second hinge structure in order to be freely inclined to the fore seat rail, and the cross brace being disposed before both the first hinge structure and the second hinge structure.