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:
Apr. 13, 1976
Filed:
Jun. 06, 1974
Applicant:
Inventors:
Gunter Blumenthal, Westerholt, DT;
Ernst Gebehart, Bochum, DT;
Assignee:
Bochumer Eisenhutte Heintzmann & Co., Bochum, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
61 4 / ;
Abstract
An apparatus is disclosed for preventing cave-ins of mining galleries and other underground excavations. It includes a base, a roof-supporting shield extending upwardly from the base and a free edge to which a roof-supporting cap is pivoted, and an advancing arrangement for advancing the apparatus towards and away from a face of the excavation. The advancing arrangement has a shiftable carriage which can move towards and away from this face and which has an end directed towards the latter, and an extension section is telescopable into and out of this end and can be arrested in a plurality of different telescoped positions.