Patent ID: 7081685

Claim:
A generator comprising: a) a base; b) an annular stator mounted on the base; c) a rotor base rotatably located in the stator and having: i) a central hole; and ii) at least one key formed on an interior surface of the central hole; d) a rotor mounted in the rotor base and spaced apart from the annular stator a predetermined distance; e) a drive shaft slidably inserted into the central hole of the rotor base and movable between first and second positions, in the first position the drive shaft is located in an upwardly most position, in the second position the drive shaft is located in a downwardly most position, the drive shaft having at least one spiral groove located on an outer surface and extending upwardly from a bottom thereof, one of the at least one key is slidably inserted into each of the at least one spiral groove; f) a biasing member located between the base and the drive shaft and providing a restitution force pressing the drive shaft away from the base; and g) a top cover mounted to the base and covering the stator, the rotor base, the drive shaft, and the biasing member, and having a central bore hole, a top of the drive shaft extending through the central bore, wherein the rotor is rotated in a first direction when the shaft moves from the first position toward the second position, and the rotor is rotated in a second direction opposite the first direction when the shaft moves from the second position toward the first position.