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. 14, 1984
Filed:
Sep. 16, 1981
Applicant:
Inventor:
Klaus Beckmann, Lunen, DE;
Assignee:
Gewerkschaft Eisenhutte Westfalia, Lunen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
405296 ; 405299 ;
Abstract
A mine roof support unit has a roof bar supported on a floor sill by hydraulic props. The floor sill is constituted by a face-side floor sill part and a goaf-side floor sill part. The two floor sill parts are telescopically interconnected. Each of the floor sill parts supports a pair of hydraulic props. Hydraulic rams are provided for moving each of floor sill parts relative to the other floor sill part in the direction of roof support unit advance.