Spring prime mover unit

Claim 1

A spring prime mover unit, comprising a spring prime mover, a transmission gear, a plurality of connectors, a mechanism frame and a box frame; said spring prime mover comprising a spring and a pair of drums, and set outside the mechanism frame; one of said drums being fixed to the front end of a main shaft and the other of said drums being mounted on a subsidiary shaft beneath said upper drum; said spring being fixed to the circumferences of each drum by both ends and having power of winding from the upper drum to the lower drum; said transmission gear comprising the main shaft, a square shaft, a rotatable shaft and an intermediate transmission gear; said main shaft passing through the mechanism frame in front and in the rear, journaled in said mechanism frame and equipped with the upper drum as described above and with a handle having an adjustor at the rear end, and said upper drum being fitted with a rotatable connector at the front; said square shaft passing transversely through the upper portion of the mechanism frame, journaled in said mechanism frame and being engaged with the main shaft by a worm and a worm gear, and both ends of the square shaft becoming rotatable connectors; said rotatable shaft passing transversely through the lower portion of the mechanism frame and being fitted with a pair of wheels at both ends and engaged indirectly with the main shaft by the intermediate transmission gear; said mechanism frame being fitted with a stopper to stop a winding back motion of the spring; and said box frame covering all the above members and being fitted with a connector at the top, with tubular side connectors at both sides in which both ends of the square shaft are housed without contact and with a semicircular ring connector at the lower portion of the back, and having an aperture for the connector of the main shaft and a pair of slots from which the wheels of the rotatable shaft are projected downward by halves.