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:
Sep. 16, 2003
Filed:
Nov. 13, 2000
Andreas Kruschinski, Düsseldorf, DE;
Gottwald Port Technology GmbH, Düsseldorf, DE;
Abstract
A method for pressure compensation in reversible motors used to drive hoisting cables and closing cables of a cable operated crane is provided. The method includes connecting a hydraulic motor to hoisting cables, connecting another hydraulic motor to closing cables, connecting the hydraulic motors to a common pressure medium source via delivery lines, performing a closing operation of a grab of the crane while simultaneously detecting working pressures in working circuits of the hydraulic motors, adjusting the working pressures during the closing operation using a control so that during the grab the working pressures are substantially equal to one another. The present invention also provides a device for pressure compensation in reversible motors for driving hoisting cables and closing cables of a cable operated crane.