| 摘要 |
A weight exercise machine comprising a cable and sheave system via which the user operates a stack of weights by grasping pulls. The pulls are attached to free ends of the cable whereby the cable is untethered on the machine frame. The untethered ends pass through respective sheave assemblies which are vertically adjustable on the machine frame and the cable is guided by a system of pulleys for an operative engagement with the weight stack. The weight stack is mounted on a separate rack frame which is adjustably inclinable on the machine frame. The weight stack is arranged for operation along the length of the rack frame so that as a consequence, the resistance encountered by the user when operating the machine is a function of the inclination of the rack frame. A power device such as a motor-drive ball screw and nut may be used to adjust the inclination of the rack frame. An optional feature comprises a power seat which has a foot rest containing control switches for operating the adjustment mechanism. Plural embodiments of sheave assemblies are also disclosed, and the sheave assemblies can be made power adjustable as well.
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