Exercise apparatus for lower extremities

Exercise devices – User manipulated force resisting apparatus – component... – Utilizing weight resistance

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Details

482137, A63B 2106, A63B 2304

Patent

active

058974733

ABSTRACT:
Exercise apparatus for building strength in the lower extremities while reducing the risk of injury to knee joints. A bench provides a surface on which a user may lie in a prone position. A pivot support member stands beside the bench. A weight-bearing lever is pivotable upon the pivot support member at a horizontal pivot located alongside the bench for the user. A second pivotable lever which has a cushioned leg bar mounted to it is pivotable about a second pivot point on the pivot support member. An arm depends below and perpendicularly to the second pivotable lever. A roller bearing extends from the arm and is received by a bearing race fixed to the underside of the weight-bearing lever. As a user lying prone on the bench moves the leg bar upward by flexion of the leg muscles below the knee, the roller urges the weight-bearing lever upward. The Rolling Fulcrum.TM. operation of the apparatus causes the pivot support of the weight-bearing lever to move away from the pivot point thereby reducing the moment of the weight on the weight-bearing arm as the user's legs raise the leg bar upward. The bearing race limits the travel of the roller bearing along the weight-bearing lever, thereby limiting the arc over which the weight may travel so that the weight does not pass over the pivot point.

REFERENCES:
patent: 2855199 (1958-11-01), Noland et al.
patent: 4509746 (1985-04-01), Mask
patent: 5683334 (1997-11-01), Webber

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