Spring drive
AssigneeGearTech Co., Ltd.
InventorShunichi Ito
Life of this patent
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Abstract
The present invention is concerns with a spring drive used as a driving power source for a moving toy. The spring drive has a windup pinion of which at least the top of one end is formed at its rotation axis as a small diameter end having a diameter smaller than the diameter of the body thereof, and a supporting member having a supporting surface for supporting the windup pinion at the small diameter end. The windup pinion is freely rotatively supported at its small diameter end on the supporting surface of the supporting member, the friction force acting against the rotation of the pinion, is decreased.
Claims6
A spring drive comprising a windup pinion, a spring windup shaft having a gear meshing with the windup pinion, a large gear provided around the spring windup shaft, a drive pinion meshed with the large gear, and a spur gear integrally formed with the drive pinion, wherein at least the top of one end of the windup pinion is formed at its rotation axis as a small diameter end having a diameter smaller than the diameter of the body thereof, and the windup pinion, at the small diameter end thereof, is supported by a supporting member having a supporting surface.
Dependencies are inferred from the claim text.