Earth bit having a pressure relief valve
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United States of America Patent
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Jul 12, 2011
Grant Date -
Feb 21, 2008
app pub date -
Aug 18, 2007
filing date -
Aug 18, 2006
priority date (Note) -
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Abstract
An earth bit includes a cutting cone mounted to a lug to form a bearing cavity. A valve is in fluid communication with the bearing cavity and a bit chamber, wherein the valve includes a diaphragm with an aperture. The aperture is repeatably moveable between open and closed conditions in response to a pressure difference between the material in the bearing cavity and bit chamber.
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