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:
Aug. 31, 1982
Filed:
May. 08, 1980
Burckhardt Elsner, Lunen, DE;
Rudiger Kirchbrucher, Dortmund-Brackel, DE;
Gewerkschaft Eisenhutte Westfalia, Lunen, DE;
Abstract
A mine roof support has a main roof bar which is pivotably connected to an auxiliary forwardly-extendible bar. A piston and cylinder unit serves to swing the auxiliary bar about the main bar to bring the auxiliary bar into a roof-contacting position aligned with the main bar or into a stowed position beneath the main bar or into some intermediate position. Pivotable guide members connect between the main and auxiliary bars respectively and a pivot joint linked to the piston and cylinder unit. The guide members can take the form of simple straps or levers but an additional piston and cylinder unit can also be used as one of the guide members.