The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2009
Filed:
Oct. 27, 2006
Manfred Kurz, Altenstadt, DE;
Bertold Grimmer, Weilheim, DE;
Manfred Kurz, Altenstadt, DE;
Bertold Grimmer, Weilheim, DE;
Hoerbiger Automatisierungstechnik Holding GmbH, Altenstadt, DE;
Abstract
A hydraulic pressure supply unit has two exits that are alternately pressurized, a reversible pumping unit including at least two pumps, reversible electric motor that drives all pumps jointly, if necessary with mutually de-locking check valves before the exits, and a supply for hydraulic medium. One pump is a low-pressure pump and one pump is a high-pressure pump, and the pressurized exits of both pumps are placed against the same exit of the pressure supply unit. Both exits of the high-pressure pump can be separated from the low-pressure pump via check valves, and each pump is connected to the supply for hydraulic medium via its own shuttle valve. Both exits of low-pressure pump can be connected to a tank via pressure on-off valves, and the control connections of pressure on-off valves are connected to the exits of the high-pressure pump in such a way that the control connection of that pressure on-off valve on the currently pressurized side is applied with pressure by the currently pressurized exit of the high-pressure pump.