Abstract: An economical light weight foldable wheelchair is selectively operable in a motorized, attendant or occupant driven self-propelled mode of operation. The wheelchair includes two opposed side frames that are foldable to a laterally more compact condition, a motor drive assembly and a foldable energy supply system support assembly. The energy supply system support assembly slidably receives two battery units with convenient front access and automatic electrical connection. Storage under the seat assures a center of gravity well ahead of the rear wheels. The motor drive system includes a releasable wheel drive assembly that supports two large rear wheels with a center of rotation behind, under or in front of the back support of the seat. Manual drive rings are mounted on the outside of the rear wheels and the occupant can easily reach a hub mounted toggle handle for the wheel drive assembly to control engagement of the rear wheels with the drive motors.

Abstract: A motorized wheelchair rear wheel drive assembly is selectively engageable and disengageable by an occupant to permit the wheelchair to be used in either a motorized mode or an occupant self propelled mode. For each rear wheel a drive motor connects through an axially extending worm gear assembly and rear drive axle to a drive hub. The drive hub is positioned outside of the rear wheel and supports a control handle which in turn controls a pair of locking pins which selectively engage the drive hub or disengage the drive hub from the rear wheel. The drive assembly enables the wheelchair to be folded to a laterally more compact condition.