Apparatus and methods for exercise machines having balancing loads. In one embodiment, an apparatus includes a load guide pivotable through at least one plane of freedom, a load slideably engaged with the load guide, a lift arm having a first end coupled to the load guide, and a cable-and-pulley device....http://www.google.es/patents/US6482135?utm_source=gb-gplus-sharePatente US6482135 - Apparatus and methods for exercise machines having balancing loads
Apparatus and methods for exercise machines having balancing loads
