Abstract: An apparatus (10) for movably mounting equipment (11) on a wheelchair (12) having an armrest (12a) and a back support (12b), which comprises first and second pivot assemblies (20, 21), a longitudinal body member (40) spacing and joining the first and second pivot assemblies (20, 21) and rotatable about a fixed axle (50) of the first pivot assembly (20). There may also be provided a device (22) to attach the fixed axle (50) to the wheelchair (12), a rotatable axle (51) in the second pivot assembly (21) supporting the equipment (11), and an assembly such as pulleys (80, 81) and a cable (83) for rotating the rotatable axle (51) as a function of the rotation of the body member (40) relative to the fixed axle (50).