Patent ID: 6769356
Filing Date: 2004-08-03
Classification: B21J,B25B,F15B

Abstract:
A method of operating a hydraulic pressing unit, in particular a manual pressing unit, it being the case that the pressing unit has a hydraulic pump, a moving part, a stationary part and a non-return valve, that, furthermore, the moving part is displaced into a pressing position by the build-up of a hydraulic pressure and the non-return valve moves automatically into an open position only in the presence of a predetermined hydraulic pressure corresponding to a pressing pressure, and that, furthermore, the moving part is configured for moving back automatically from the pressing position into an end position under the action of a restoring spring and the non-return valve is configured only to close once the moving part has reached the end position, wherein the non-return valve is subjected to the action of a closure force, which is necessary for achieving the optional stopping in position of the moving part as the moving part moves back, when a pre-selected return position or a predetermined return position of the moving part is reached.