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:
Mar. 22, 1977
Filed:
Jan. 22, 1976
Karl Heinz Wehner, Castrop-Rauxel, DT;
Klockner-Werke AG, Duisburg, DT;
Abstract
A mine roof support comprises a support member adapted to rest on the floor of a mine gallery, a first shield projecting upwardly from the rear end of the support member, a second shield pivotally attached at its lower end to the upper end of the first shield, an expandable and contractable prop between the support member and the second shield for changing the inclination of the latter and a cap adapted to engage the roof of the mine gallery pivotally attached between its ends to the upper end of the second shield to form between the upper surface of the latter and the bottom face of the cap a wedge-shaped space directed away from the face of the mine gallery. The mine roof support further includes an arrangement for preventing loose rock material from penetrating into this space and comprising a rugged flexible web attached at one end to the upper face of the second shield and extending over a guide roll journalled in bearing on the rear end of the cap along the bottom face toward the front end of the latter, and an arrangement mounted in the region of the front end of the cap and operative for maintaining the web in taut condition.