Undertaking
Patent
1987-11-20
1989-07-11
Apley, Richard J.
Undertaking
272129, 272134, 272DIG4, 272DIG5, 272DIG6, A63B 2124
Patent
active
048464660
ABSTRACT:
An exercise device is provided having a working arm structure which has its proximal end rotatably mounted to a frame. Exercise force is to be applied at the working arm's distal end to rotate the working arm during the positive stroke or resist the movement of the working arm during the negative stroke for each exercise repetition. An electro-hydraulic system provides a predetermined, substantially constant resistance to rotation of the working arm during such positive and negative strokes. This predetermined constant resistance is applied to the working arm at a fixed application point between the proximal and distal ends thereof, with the constant resistance being applied at the application point at an angle such that as the working arm is rotated, the angle changes to ensure the provision of a substantially proportional resistance to rotation of the working arm at the distal end. In a preferred embodiment, a microprocessor device determines the desired constant resistance to be applied to the working arm for any particular sequence of repetitions of the working arm. This microprocessor device calculates the constant resistance in response to the strength input data collected during an isometric contraction period in an initial minor portion of the first repetition of the sequence. In order to supply accommodating resistance in a preferred embodiment of the exercise device during periods of excessively accelerated rotation of the working arm, a simple hydraulic impedance can also be implemented into the electro-hydraulic system.
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Apley Richard J.
Cheng Joe H.
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