Abstract: The present invention provides an assembly having a wheelchair and a lift assembly to urge the seat surface upward with respect to the frame from a lowered position when supporting a seated individual during use to an elevated position with respect to the frame as to assist the individual during ingress or egress to or from the wheelchair. The lift assembly may include a mechanical linkage and an actuator assembly. The actuator assembly produced a nonlinear lift force having a first period exhibiting a first rate of amplitude increase when the seating surface is nearer the lowered position and a second period exhibiting a second rate of amplitude change that is less than the first rate of amplitude increase when the seating surface is nearer the elevated position.

Abstract: A charging device for use with a door assembly is described. The charging device for use with a door assembly is configured to convert kinetic energy of linear motion to electromotive force and includes a rechargeable power source coupled to the charging device, wherein the linear motion is caused by movement of the door assembly to charge the rechargeable power source. Also, a charging device and method for wirelessly charging an electrical storage device on a door assembly includes a transmitting coil positioned proximate a door assembly and a receiving coil positioned on a door assembly for inductively charging the electrical storage device and for powering a senor for wirelessly sending an alert signal.