Provided is a weighted cable resistance apparatus, primarily for rehabilitation and therapy, and equally effective for recreational exercising. A frame with a perpendicularly attached seat form a rigid structure. The structure is supported on leveling screws or lockable casters for transport to bed-confined...http://www.google.com.tw/patents/US6443877?utm_source=gb-gplus-share專利 US6443877 - Compact, multi-choice exercise apparatus
