Method of operating a hydraulic pressing unit, and hydraulic pressing unit

  • US 6,769,356 B2
  • Filed: 12/12/2002
  • Issued: 08/03/2004
  • Est. Priority Date: 12/13/2001
  • Status: Active Grant
First Claim
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1. 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.

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