Rotary curved hollow rod power transmission appliances

An electric power transfer device utilizes a rotary bend and hollow pole to transfer electric power between the rotary bend and hollow pole and a fixed show-board. Said electric power transfer device works at 36V safe voltage and transfers electric power directly through the rotary pole. The device comprises a rotary pole, a pole bushing, a spindle, a bearing, a reed, wires, and a show-board; the rotary pole and the pole bushing form a separate assembly and are made of a conducting material; the spindle, bearing, reed, and wires are mounted in the show-board; the assembly is mounted onto the show-board by insertion, and in that way, a multi-layer structure can be formed conveniently. The device doesn't utilize wires to transfer electric power, and thereby solve the problem of fatigue fracture of wires.