Abstract: A pushable frame includes a plurality of wheels to allow maneuvering due to a rolling motion of one or more wheels. A power generator is operatively connected to the wheels such that kinetic motion of the wheels caused by the frame being pushed or pulled by the user is converted into electric energy. A speed regulator is operatively connected with the plurality of wheels and the power generator such that a rolling speed of one or more wheels is controlled based on a rolling condition of the one or more wheels.

Abstract: A fold type headrest includes a housing, a rotation support hinged on the housing, a stay rod mounted on the rotation support on the lower part of it and a cushion being attached on the upper part of it. The first spring elastically supports the rotation support or stay rod toward the folding direction, and a stopper is rotatably mounted on the housing and having an engaging paw to be engaged with the lower part of the stay rod. A second spring elastically supports the stopper toward the engaging position with the stay rod, and a releasing means is provided to disengage the stopper from the stay rod.