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:
Dec. 29, 1981
Filed:
Apr. 14, 1980
Applicant:
Inventor:
Volker Knorr, Sprockhovel, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299 53 ; 74422 ; 299 43 ;
Abstract
A gear rack for a longwall mining machine characterized in having a width permitting the arms which carry the cutter drums of the mining machine to move to lower positions relative to a face conveyor such that low seams of coal may be mined. The rack comprises a plate extending along the face conveyor and has driving pin extensions which extend from one face of the plate to engage a driving gear or gears on the mining machine.