Abstract: A body frame (10) for a wheelchair includes a main frame (11), a back frame (12) and a seat frame (13). The body frame (10) includes hinge structures (31), (38), (53) and (56) for causing the user of a wheelchair to lie down, and cross braces (15) and (16) for implementing the fold of the wheelchair. The hinge structures (31), (38), (53) and (56) are provided so that the main frame (11) and the seat frame (13) are divided in a longitudinal direction. The center of each of the hinge structures (31), (38), (53) and (56) is present on an identical virtual axis in a transverse direction. The cross braces (15) and (16) are disposed before each of the hinge structures (31), (38), (53) and (56).

Abstract: A body frame (10) for a wheelchair includes a main frame (11), a back frame (12) and a seat frame (13). The body frame (10) includes hinge structures (31), (38), (53) and (56) for causing the user of a wheelchair to lie down, and cross braces (15) and (16) for implementing the fold of the wheelchair. The hinge structures (31), (38), (53) and (56) are provided so that the main frame (11) and the seat frame (13) are divided in a longitudinal direction. The center of each of the hinge structures (31), (38), (53) and (56) is present on an identical virtual axis in a transverse direction. The cross braces (15) and (16) are disposed before each of the hinge structures (31), (38), (53) and (56).

Abstract: A bicycle rear derailleur including a tensioner frame which rotatably support a guide pulley and a tension pulley, a shifter for shifting the tensioner frame in directions substantially parallel to an axis of a rear wheel hub, the tensioner frame including a tension pulley support arm which is resiliently urged to pivotally move rearwardly of the bicycle, and a compensating mechanism for compensating a sagging in an endless drive chain, which is arranged to stretch out the drive chain rearwardly of the bicycle so that a distance between a geometrical vertical line passing through a center of the tension pulley and a vertical tangential line at a rearmost point of a rearwardly stretched portion of the drive chain is larger than a radius of the guide pulley when the tension pulley support arm takes its rearmost position.