Wheelchair with integrated transfer board

An accessory device for use by an occupant in a wheelchair includes a platform and a reorientation mechanism that enables the rotation, pivoting, and sliding motion of the platform with respect to the wheelchair. The device is reconfigurable from a first, stowed position in which the platform extends along one side of a first seating surface to a second, deployed position in which the device bridges the first seating surface and a second seating surface. In the stowed position, the device functions as an armrest, while in the deployed position, the device functions as a transfer board. The platform may be slid in and out with respect to the wheelchair.