| 摘要 |
<p>An improvement of a spring operated, reversibly rotatable body having a surface on which a flexible, elongated object, e.g. a wire or a band, can be wound, said body being connected with a spring which is stretched by the rotation of the body during the unwinding of said elongated object. The improvement includes a transmission between the elongated object and the spring, said transmission having a gearing ratio which is varied during the rotation of the body. The variable gearing ratio can be obtained by giving the surface of the rotatable body, along the axis of rotation, a varying distance to the axis of rotation. In a preferred embodiment, two rotatable bodies, are used, said bodies being connected by means of a traction wire which is wound on the surfaces of said bodies. One of the bodies is connected with the spring and the other with an output shaft.</p> |
