Patent ID: 6746302
Filing Date: 2004-06-08
Classification: A63H

Abstract:
A windup spring drive unit having a manually windable spring, comprising: a windup shaft which is arranged coaxially with the spring; an output shaft spaced from the windup shaft; a gear train operatively engaged between the windup shaft and the output shaft for transmitting power of the spring to the output shaft; and a casing having a thin direction and an orthogonal wide direction and which accommodates the windup shaft, the spring, the output shaft and the gear train therein; the gear train including a crown gear, a center of rotation axis of the crown gear being arranged parallel to the windup shaft, the output shaft and the windup shaft being arranged in a crossing and orthogonal positional relationship when seen from a direction along which the output shaft and the windup shaft overlap, one end of the windup shaft protruding in the thin direction of the casing and adapted to protrude by a distance which is sufficient to include means for manually inputting rotation in the windup shaft.