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:
Sep. 20, 1977
Filed:
Jan. 17, 1975
Karoly Bole, Varpalota, HU;
Kalman Nagy, Varpalota, HU;
Istvan Aufsatz, Budapest, HU;
Jozsef Bohnert, Budapest, HU;
Laszlo Branyi, Budapest, HU;
Zoltan Ilyes, Budapest, HU;
Jozsef Korbuly, Budapest, HU;
Janos Nemeth, Budapest, HU;
Banyaszati Kutato Intezet, , HU;
Abstract
The invention concerns an advanceable shield support assembly for longwall mining. The assembly has a pivotable main roof cap housing a retractable and extensible auxiliary roof cap. Normally the main roof cap supports the roof and the auxiliary one is retracted. However, before the assembly is advanced, the auxiliary roof cap is extended to support the roof section between the working face and the front edge of the main roof cap. The movement of the auxiliary roof cap, and the force with which it engages the roof section, are controlled by cooperating guide tracks and track-engaging elements capable of exerting a wedging action.