An exercise device has a support frame and a lever arm attached to the support frame and pivotably movable between a rest position, wherein the lever arm hangs downwardly and an extended position, wherein the lever arm is pivoted relative to its rest position. A range of motion (ROM) device is rigidly...http://www.google.co.uk/patents/US6090020?utm_source=gb-gplus-sharePatent US6090020 - Constant tension exercise device
