| 摘要 |
PCT No. PCT/GB93/01984 Sec. 371 Date Mar. 15, 1995 Sec. 102(e) Date Mar. 15, 1995 PCT Filed Sep. 21, 1993 PCT Pub. No. WO94/06673 PCT Pub. Date Mar. 31, 1994A cycle is convertible between a standard cycle configuration for normal cycling and an exercise configuration in which the cycle is propelled forwards by alternate saddle strokes, and pedal strokes, the saddle stroke comprising putting the cyclist's weight on the saddle which moves downwardly driving the crank shaft and bringing the two in-phase pedals upwardly, the pedal stroke comprising pressing down on both pedals to bring the saddle up again. In the exercise configuration the cycle is prevented form stalling by an arrangement whereby when the pedals are at bottom dead center the weight on the saddle is applied to the crank at an angle to the vertical to maintain forward propulsion, and whereby when the saddle is at bottom dead center the pedals are just forward of top dead center so as to maintain forward propulsion. In the exercise configuration the pedals may be constrained to rotate in one direction only by means of a ratchet mechanism thereby preventing the pedals hitting the cyclist on the shins.
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