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:
Feb. 05, 1980
Filed:
Jul. 21, 1977
Applicant:
Inventors:
Otto Minke, Essen, DE;
Willy Lanfermann, Bochum, DE;
Assignee:
Ruhrkohle, A.G., Essen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299 43 ; 105 / ;
Abstract
A thrust device for a coal cutter running on a sectional string of trunking of a chain conveyor comprises a pinion on the coal cutter cooperating with a rack located on the conveyor. The rack is formed of a plurality of linked sections only one of which is firmly attached to the conveyor, the other sections being guided for longitudinal movement relative to the conveyor. The purpose of this arrangement is to avoid straining the rack or producing tooth pitch variations at the junctions of adjacent rack sections when the trunking flexes due to geological disturbances.