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A hydropunch comprises a cylinder, with one end thereof facing the working surface of a die intended for positioning thereon a workpiece to be treated. Accommodated inside the cylinder and forming an above-the-ram chamber and a below-the-ram chamber is a ram which is actuated by means of a suitable actuator mounted on that end of the cylinder which is opposite to the aforementioned end thereof, the ram being connected with a system for returning the ram to its original position. In addition, the hydropunch includes a compressed gas receiver communicating with the above-the-ram chamber of the cylinder, and a cover adapted for closing both the cylinder and receiver. In accordance with the invention, the system for returning the ram to its original position comprises a closed chamber communicating with the below-the-ram chamber of the cylinder, and a value intended for communicating the above-the-ram chamber with the atmosphere.

AN OBJECTIVE METHOD TO EVALUATE FORCE AND KNEE JOINT MOMENTS DURING ISOMETRIC EXTENSION