Four-bar variable resistance leg extension machine

Details Four-bar variable resistance leg extension machine Four-bar variable resistance leg extension machine

1988-09-01

1989-06-13

Apley, Richard J.

Undertaking

272117, A63B 2100

Patent

active

048385484

ABSTRACT:
A leg extension exercise machine which utilizes a frame-journaled rotating effort arm, which is mechanically linked to a frame-journaled rotating weight arm, which, together with the frame of the machine and the connecting link joining them, form a simple planar double-rocking-lever four-bar linkage, which acts in conjunction with the rotating weight arm to vary the resistive force applied to the operator's leg extending muscles through body-machine contact with the rotating effort arm throughout the range of the exercise movement.

REFERENCES:
patent: 2855199 (1958-10-01), Noland et al.
patent: 3917262 (1975-11-01), Salkeld
patent: 4336934 (1982-06-01), Hanagan et al.
patent: 4357010 (1982-11-01), Telle
patent: 4407495 (1983-10-01), Wilson
patent: 4509745 (1985-04-01), Angsten
patent: 4509746 (1985-04-01), Mask
patent: 4757991 (1988-07-01), Maag
patent: 4790530 (1988-12-01), Maag

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