Undertaking
Patent
1988-06-16
1989-05-30
Apley, Richard J.
Undertaking
272117, A63B 2100
Patent
active
048343676
ABSTRACT:
An exercise machine for performing supination and pronation exercises comprises a framework, a weight stack carriage that is supported on said frame work for vertical motion, and an input mechanism that is operably coupled by a cable and a system of sheaves on the framework to the weight stack carriage. The input mechanism comprises a horizontal shaft that has operating handles at opposite ends for rotating the shaft. A bi-cam is disposed on the shaft, and one end of the cable is tethered to a high point of the bi-cam. The bi-cam has respective cam profiles in its respective halves; one profile interacts with the cable when the shaft is rotated in one sense from a starting position, and the other profile interacts with the cable when the shaft is rotated in the opposite sense from the starting position. The cams have decreasing profiles so that the torque load imposed on the user progressively decreases as the shaft is rotated from the starting point, thereby enabling the machine to closely match the user's strength profile for performing supinations and pronations.
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patent: 4763897 (1988-08-01), Yakata
Gittleson James M.
Salyer Alan
Apley Richard J.
Bahr Robert W.
The Coach and Company Incorporated
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