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1. US20090133591 - Method of operating a hydraulic pressing unit, and hydraulic pressing unit having a hydraulic pump

Office United States of America
Application Number 12302549
Application Date 29.05.2007
Publication Number 20090133591
Publication Date 28.05.2009
Grant Number 07908963
Grant Date 22.03.2011
Publication Kind B2
IPC
B30B 1/23
BPERFORMING OPERATIONS; TRANSPORTING
30PRESSES
BPRESSES IN GENERAL; PRESSES NOT OTHERWISE PROVIDED FOR
1Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
18by screw means
23operated by fluid-pressure means
Applicants Gustav Klauke GmbH
Inventors Frenken Egbert
Agents Clark Hill PLC
Priority Data 10 2006 026 552 08.06.2006 DE
Title
(EN) Method of operating a hydraulic pressing unit, and hydraulic pressing unit having a hydraulic pump
Abstract
(EN)

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.