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:
Jul. 31, 2012
Filed:
Apr. 21, 2009
Martin Steigerwald, Glattbach, DE;
Burkhard Sturmer, Kleinostheim, DE;
Martin Steigerwald, Glattbach, DE;
Burkhard Sturmer, Kleinostheim, DE;
Linde Material Handling GmbH, Aschaffenburg, DE;
Abstract
A hydrostatic pump () with a variable displacement volume can be operated in a closed circuit and is driven by a drive engine (), in particular by an internal combustion engine. To control the displacement of the pump (), a control device () is provided which can be actuated as a function of the speed-dependent control pressure which is a function of the speed of the drive engine (). To improve the control characteristics of the pump, a switchover device () is provided, by which the pump () can be switched between a speed-dependent displacement control by the speed-dependent control pressure and a volume flow-dependent delivery control, in which the control device () of the pump () can be controlled as a function of the actuation of an actuator mechanism ().