| 摘要 |
The pivotally mounted force input lever of a leg extension exerciser machine is connected by a chain, sprocket and cam system to a multi-element weight stack such that leg-driven pivotal motion of the lever may be resisted by a selectively variable portion of the weight stack. A counterbalanced foot engagement structure is pivotally secured to the outer end of the lever, and the lever is rotationally counterbalanced by a counterweight secured to its opposite end. User leg length adjustment of the machine is effected by pivotally adjusting the foot engagement structure relative to the lever, without shifting the center of gravity of the foot engagement structure, to thereby avoid disturbance of the rotational balance of the input lever. A resisted motion range adjustment mechanism is incorporated in the machine and is operative to selectively vary the weight-resisted angular start setting of the lever without altering the angular position relationship between the force input lever and the machine cam. A position gauge is used to continuously provide a visual indication of the angular position of the input lever within its overall motion range.
|
