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:
Oct. 23, 1984
Filed:
Apr. 29, 1983
Willy Lanfermann, Bochum, DE;
Abstract
A longwall mining machine and method for its use, the machine traveling over a face conveyor having a first toothed rack extending therealong. A gantry-like frame is movable along the face conveyor and has upstanding supports at its opposite ends which carry an upper track and a second toothed rack. A first mining machine frame is carried on the face conveyor and has drive pinion means engageable with the first toothed rack. A second mining machine frame is carried on the upper track of the gantry-like frame and has drive pinion means engageable with the second toothed rack. The first and second mining machine frames each having a shearer drum mounted thereon for cutting and removing a mineral seam. Means are provided for selectively securing the first and second mining machine frames to the gantry-like frame, the arrangement being such that when the first and second machines are secured to the gantry-like frame, the entire frame with both mining machine frames will traverse the face conveyor upon rotation of the drive pinion means on the first mining machine. At the end of a face area being mined, the lower mining machine frame is moved to a position where it is directly beneath the upper mining machine frame.