Abstract: A motorized door opening device, including at least one wheel, configured to be lowered to a surface and forced thereagainst with a force sufficient to ensure friction between the wheel and the surface and to prevent slipping of the wheel relative to the surface; an electric motor including a rotor coupled to rotate the wheel; a wheel actuator, coupled between the door and the wheel, to lower the wheel to the surface in response to a wheel lowering signal; and control circuitry to signal the wheel actuator to lower the wheel by generating the wheel lowering signal and push down the wheel to create friction; and a door attachment member to attach the motor and the wheel actuator to a bottom part of the door; whereby rotation of the wheel after lowering of the wheel causes the wheel to rotate in contact with the surface and move the door.

Abstract: A rolling footrest is provided and a method of using such by a wheelchair occupant. The footrest may optionally include a foot retainer, a platform and freely rolling castors. In some embodiments, replacing a fixed footrest will shorten the length of the wheelchair enabling the wheelchair to traverse sharp curves. In some embodiments, the footrest may include a swivel lock and/or a ratchet. In some embodiments the footrest may be used for therapeutic exercise. In some embodiments, the footrest may be used for propelling a wheelchair.

Abstract: A system and method for music playing and enjoyment, especially by handicapped persons. In some implementations, the system includes automatic height adjustment. In some implementations, the system includes oversized keys suitable for activation not body parts other than fingers. The sound quality is desirably professional.