Patent ID: 8151956

Claim:
An energy supply device, comprising: an energy supply unit comprising: a plurality of links; a plurality of axes disposed perpendicular to a longitudinal direction of the energy supply unit and each axis is joined to two adjacent links; a first end that is locally fixable; a second end that is movable in the longitudinal direction; an upper run; a lower run; and a cart disposed between the upper run and the lower run of the energy supply unit, and the cart is movable back and forth in the longitudinal direction of the energy supply unit, wherein the cart comprises: a base body; and a return motion device connected to the base body, wherein the return motion device is formed at least partially by a curved guide channel having an inner curved section, and an outer curved section spaced apart from the inner curved section, so that the energy supply unit slides along the curved guide channel, and wherein an angle of circumference of the inner curved section is greater than an angle of circumference of the outer curved section and greater than 180°.