Cylindrical Grinding Machine in Combination

A mining machine comprising in combination a base member having means at its rear end for connection with a fixed pivot about which the base rotates in a cutting sequence in a mine room, a forwardly projecting boom supported from said base -for' movement therewith about the pivotal axis and including widely spaced upper and lower endless drive chains with cutter bits secured thereto,Cylindrical Grinding Machine a drum mounted on said boom for totation by said chains about a vertical axis and having a cylindrical substantially contiguous surface,- a plurality of removable cutter bits arranged substantially uniformly over the surface of said drum and cooperating with the chain bits to provide a wide cutter head for providing a continuous disintegrating action of an ore face against which the head is rotated during axial movement of the boom in a horizontal plane.

Means connecting the base with at least two spaced surfaces of the mine room and arranged to impart a horizontal movement to the base about said pivotal axis during progression of said disintegrating action, and means associated with said base for advancing and retracting said cutter from said pivotal axis independently of said axial movement.A mining machine comprising in combination a base member having means at its rear end for connection with a fixed pivot about which the base rotates in a cutting sequence in a mine room, a forwardly projecting boom supported from said base for movement therewith about the pivotal axis and including widely spaced upper and lower endless drive chains with cutter bits secured thereto, a drum mounted on said boom for rotation by said chains about a vertical axis and having a cylindrical substantially contiguous surface, a plurality of removable cutter bits arranged substantially uniformly over the surface of said drum and cooperating with the chain bits to provide a wide cutter head for providing a continuous disintegrating action of an ore face against which the head is...