Method of operating a hydraulic pressing unit, and hydraulic pressing unit having a hydraulic pump
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United States of America Patent
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Mar 22, 2011
Grant Date -
May 28, 2009
app pub date -
May 29, 2007
filing date -
Jun 8, 2006
priority date (Note) -
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Abstract
A hydraulic pressing unit includes a hydraulic pump, supply and hydraulic chambers, moving and stationary parts, a restoring spring, and a return valve provided within or attached to a housing. The moving part is displaced from a starting position into a pressing position as a result of filling the hydraulic chamber with a hydraulic medium from the supply chamber by using the hydraulic pump. The return valve is automatically displaced into an open position as a result of a hydraulic pressure corresponding to the pressing position, and the restoring spring moves the moving part. A piston acts on the flow of the hydraulic medium and lowers the pressure such that the return valve is displaced into the closed position.
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