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. 30, 1980
Filed:
Feb. 05, 1979
Ernst-Gunter Nerlich, Essen, DE;
Bochmer Eisennuette Heintzmann GmbH, Bochum, DE;
Abstract
A control arrangement for a hydraulically operated mine roof support having first and second consumers which require smaller and larger amount of the working medium per time unit, respectively, has first control elements for the first consumers and second control elements for the second consumers. The first control elements include a first bundle of hoses having a small inner diameter and arranged to select and apply pressure to the first consumers directly from a neighboring mine roof support. The second control elements include a second bundle of hoses with a small inner diameter, main control valves indirectly remotely controlled through the second bundle of hoses and arranged to select the second consumers, and conduits extending between the second consumers and the main control valves and arranged to apply pressure to the former. The conduits have an inner diameter which exceeds that of the hoses of the first and second bundles.