Abstract: The apparatus is a biomechanical body support including a substructure, a seat which is supported by said substructure and is tiltable relative to said substructure, a backrest which is coupled to said seat and is tiltable relative to said seat, the tilting axis of the backrest approximately coinciding with the pivotal point of the hip joint of a person resting on said seat, as well as a leg support also tiltably connected to said seat.

Abstract: A driving gear for a muscle power driven vehicle, such as a wheel chair, comprising an input shaft drivable by means of a lever, and adapted to be coupled through at least two freewheel clutches to an output shaft arranged to be connected to a wheel hub of the vehicle, wherein the driving gear (4) is housed in a closed housing (11, 12) which is arranged to be coupled through said output shaft (22) to the wheel hub (5) of the vehicle, said input shaft (7) being fixedly coupled to an input gear wheel (14) meshing with two separate intermediate gear wheels (16, 16') adapted to be connected through freewheel clutches operative in opposite directions of rotation to one (20) or the other (20') of two meshing change gear wheels, one of which also meshes with a first output gear wheel (21) mounted on the output shaft.