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:
Mar. 30, 2021
Filed:
Jul. 25, 2019
Hawe Altenstadt Holding Gmbh, Altenstadt, DE;
Martin Rauwolf, Schongau, DE;
HAWE Altenstadt Holding GmbH, Altenstadt, DE;
Abstract
A lifting device comprises a delivery direction-reversible hydraulic unit and at least three hydraulic lifting cylinders. The hydraulic cylinders are dimensioned in a stepped manner in such a way that the piston rod working space of an n-th lifting cylinder and the piston working space of an (n+1)-th lifting cylinder, with n from 1 to z−1, wherein z indicates the number of hydraulic lifting cylinders of the lifting device, have the same effective area. The at least three lifting cylinders are hydraulically connected in series in such a way that the respective working spaces with the same effective area are directly fluidically coupled by means of a hydraulic connection. The piston working space of the first lifting cylinder and the piston rod working space of the z-th lifting cylinder are in fluid connection with the connections of the delivery direction-reversible hydraulic unit.