E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/77, 262/78
E21C 27/24 (2006.01) E21C 27/22 (2006.01) E21D 9/10 (2006.01)
Patent
CA 1151680
TITLE EXTENSIBLE AND RETRACTABLE ROTOR ARM CUTTING ASSEMBLY ABSTRACT OF THE DISCLOSURE A rotor arm cutting assembly includes a plurality of cutter arm members extending radially outwardly from a hub portion which is adapted for nonrotatable connection to a drive shaft extending from the front of a mining machine. Each cutter arm member includes a front face for supporting cutter bits operable to dislodge solid material from a mine face upon rotation of the drive shaft. A slot extends longitudinally outwardly from the hub portion to the end of each cutter arm member on the front face. A cutter arm extension is positioned for longitudinal movement in the slot. Complimentary guide members and guide ways associated with the extension portion and the cutter arm member maintain the extension portion movable in a longitudinal direction in the slot. The extension portion is extended and retracted relative to the cutter arm member by operation of a fluid actuated cylinder positioned for conventional servicing within a recess in the back of the cutter arm member. The extension portion also supports cutter bits so that extension thereof from the end of the cutter arm member extends the effective cutting length of the cutter arm member.
376856
Lebegue Maurice K.
Michael Earl C.
Eimco Llc
Macrae & Co.
LandOfFree
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