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:
Feb. 01, 1983
Filed:
Jun. 02, 1981
Donald L Leibee, Bedford, PA (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
Disclosed herein is a new method and improved apparatus for digging and mining earth formations, especially coal formations. A mining or excavating machine having a movable frame with a drive means mounted on the frame is provided with a rotatable structural member and a rotatable cutter support having cutter bits mounted thereon. The structural member is rotatably mounted on the frame and connected to the drive means so as to be driven in one direction of rotation about a longitudinal axis of the structural member. The rotatable cutter support assembly with the cutter bits mounted thereon is rotatably mounted on the structural member and is freely rotatable about its longitudinal axis. The mining machine is then positioned so that the cutter bits will reduce the mineral formation by driving the structural member in one direction of rotation about its longitudinal axis. Engagement of the mineral formation with the cutter bits then causes the freely rotatable cutter support to rotate about its longitudinal axis in a direction that is reverse to that of the power driven structural member. This method of mining mineral formations, especially coal, allows the type cutter bits commonly used to penetrate and fracture the mineral formations without undue and unnecessary frictional engagement, eliminating unnecessary dust and sparks. A new type cutter bit is also disclosed herein for use with the apparatus.