Patent
Dual-direction pulley system
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TLDR
In this article, a dual-direction pulley system was presented for a leg curl/extension exercise machine such that a user can perform leg curls and leg extensions from a single seated position.Abstract:
A dual-direction pulley system is disclosed in conjunction with an exercise machine. The pulley system provides resistance to a pivotally mounted actuator lever when the lever is rotated clockwise and when the lever is rotated counterclockwise. In a preferred embodiment the dual-direction pulley system provides resistance for a seated leg curl/extension exercise machine such that a user can perform leg curls and leg extensions from a single seated position.read more
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Patent
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References
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Variable resistance exercise device
TL;DR: In this paper, a variable resistance exercise device was proposed to provide a variable resisting force in response to a user's applied force by varying the viscosity of a variable fluid which surrounded plates rotated by the user applied force.
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Roy Simonson,William T. Dalebout +1 more
TL;DR: In this paper, a highly versatile exercise apparatuses including a central weight stack and opposed extension arms are described. But they do not discuss the use of a cable in the arms.
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