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:
Jun. 01, 1982
Filed:
Feb. 25, 1980
Wilfried Krabbe, Dreieich-Buchschlag, DE;
Philipp Holzmann Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A shield arrangement used for tunneling and mining in which a work chamber has an open front side located at the work face from which material is to be removed in tunneling and mining operations. Pressure is admitted into the work chamber for supporting the work face against crumbling and collapse. The work chamber also has supporting elements for the work face, which are selectively movable into and out of an operative position in which they support the work face. These selectively movable supports serve to replace at least partially, the support provided by the pressure medium admitted into the work chamber. The chamber has a longitudinal axis normal to the open side of the supporting elements which may be in the form of plates.