Patent ID: 6595903
Filing Date: 2003-07-22
Classification: A63B

Abstract:
A device for selectively varying, in a mechanical transmission of an exercise apparatus connecting a movement organ receiving a muscle action of a person performing the exercise and resistive means that oppose said muscle action, the forces and the movements exchanged between said movement organ and said resistive means, comprising at least a pulley; a movable structure bearing a pivot pin for the rotation of the pulley to which structure is applied a traction force correlated to the effort which the person performing the exercise applies to said movement organ, said traction force being coplanar with, and directed transversely to, the axis of the pivot pin for the rotation of the pulley;a cable element wound around an arc of the pulley in such a way as to form a pair of parallel branches, a first branch whereof has an end connected to the resistive means, the second branch instead having an end connected to a bar movable within a vertical fixed guide; said device further comprising means for selectively fastening the movable bar and the fixed guide; said fastening means anchoring, in a first operative condition, the movable bar to the fixed guide, thereby opposing the traction force applied to the pivot pin of the pulley with a reaction force whose intensity is twice as large as that of the reaction force of the resistive means; said fastening means instead allowing, in their second operative condition, the bar to translate freely relative to the guide and until it reaches an abutting condition against the movable support structure in which the traction force applied to the pivot pin is opposed by a reaction force equal to the reaction force of the resistive means.