| 摘要 |
An amusement device, such as a sling-shot machine, for successively propelling and retarding a rider to cause the rider to undergo a vertically oscillatory motion. The amusement device comprises cables (31, 32) one end of each of which is connected to a carrier (19) for supporting one or more riders. A releasable anchoring means is provided for releasably anchoring the carrier (19) at a launch site (17). An elastic structure (71) has opposed ends between which the elastic structure can undergo extension and contraction. One end of the elastic structure (71) is connected to a first support means (57). Each cable (31, 32) passes around a support tower (11) and has a section thereof winding back and forth between first and second guide means (83, 85). The first guide means (83) is connected to the other end of the elastic structure (71) and the second guide means (85) is connected to a second support means (47). The winding section of the cable (31, 32) provides a link between the elastic structure (71) and the second support means (47). A hydraulic ram (67) is provided for tensioning the elastic structure (71) prior to release of the anchoring means whereby energy stored in the loaded elastic structure (71) is transferred to the cables (31, 32) to cause upward propulsion of the carrier (19) on release of the anchoring means.
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