Extendable cutter drum for a boring machine
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United States of America Patent
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Jan 13, 2009
Grant Date -
Sep 11, 2008
app pub date -
Apr 27, 2007
filing date -
Mar 5, 2007
priority date (Note) -
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Abstract
A mining machine that includes a rotor assembly disposed on a mobile frame. A cutter drum assembly includes an intermediate drum section and a pair of end drum sections. The end drum sections are drivingly connected by the intermediate drum section. The end drum sections include an axially fixed drum portion and a drum extension that is axially movable on the drive shaft to extend the length of the cutter drum assembly. A hydraulic piston and cylinder arrangement is disposed in shafts supporting the end drum sections, and extends and retracts the drum extension with respect to the fixed drum portion. A torque transfer arrangement is disposed between the fixed and extension drum portions for mutual rotation.
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