Presses – Reciprocating press construction – Fluid pressure actuation
Reexamination Certificate
2011-03-22
2011-03-22
Nguyen, Jimmy T (Department: 3725)
Presses
Reciprocating press construction
Fluid pressure actuation
C072S453010
Reexamination Certificate
active
07908963
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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Clark Hill PLC
Gustav Klauke GmbH
Nguyen Jimmy T
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