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:
Nov. 06, 1979
Filed:
May. 22, 1978
Rolf Goldschmidt, Witten-Annen, DE;
Klaus Hansgen, Witten, DE;
Heinz M Hiersig, Dusseldorf, DE;
Fritz Kirstenpfad, Bad Harzburg, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
A lifting device having a rotating female threaded member and a non-rotating axially movable lifting spindle is load releaved by means of pressurized oil pumped to oil pockets in the threads of the female member. Multiple pumps are secured to the female member and are arranged in pairs with a common drive shaft and a pinion for each pair. The pinions all mesh with the internal gear of an annulus being concentrically arranged around the member and having an external gear for independent driving. The pumps are connected to the pockets by means of ducts, there being no fluid pass across moving interfaces. The pumps have a common suction feed which dips into an annular reservoir.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile