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. 11, 1978
Filed:
Feb. 16, 1977
Applicant:
Inventors:
Walter Weirich, Dortmund, DE;
Heinrich Wildforster, Gelsenkirchen-Buer, DE;
Assignee:
Gewerkschaft Eisenhutte Westfalia, Lunen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
299-1 ; 299 43 ;
Abstract
A system for controlling the thrust applied to a mineral winning machine, which is movable along a guide at a longwall face in a mine working, includes control means which regulates the thrust applied to the guide by hydraulic rams in dependence upon the loading of the winning machine drive. The control means may include one pressure regulator for each ram, one pressure regulator for each of a plurality of groups of rams, or one pressure regulator for all the rams.