| 摘要 |
<p>Mechanisms in which one member may occupy one of two fixed positions and can be caused to change over from one position to the other at will. In order to accomplish rapid change-over with minimum energy input and minimum impact, an elastic suspension of this member is provided and so arranged that the change-over process is substantially a half cycle of oscillation in which the moving members starts and ends with no or little speed of motion. The moving member is captured in the vicinity of, and held at the fixed positions, against the force exerted by the said elastic suspension by mechanisms exerting short range forces upon it. When a change-over is to be initiated, the corresponding short range force is temporarily removed by an appropriate means. This then releases the said moving member, which executes substantially a half cycle of oscillation and is captured again at the opposite fixed position. </p> |
