Abstract: The present invention relates to a torque converter device which is suitable for use incorporated in a wheelchair. The device includes, on each side of the wheelchair, two one-way clutches such as that which is illustrated in FIGS. 10-11 of the U.S. Pat. No. 4,763,544, coupled together with a handle mechanism so that when a user manipulates the handles forward and backward, force is transmitted to the wheels of the wheelchair. By twisting the handles in one direction or another, the directions of movement of the wheelchair may be reversed.