Rock drill bit with back-reaming protection

作者: Peter Thomas Cariveau , Robert Wagoner , William M. Conn , Roger Didericksen

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摘要: A drill bit for boring a bore hole in an earthen formation comprises: body having pin end, cutting end and longitudinal axis including at least two legs extending from the each of bearing that rotatably supports cutter cone. The further includes fluid flow system, flowway said is communication with one exit port being defined by nozzle boss disposed adjacent legs. Each leading side surface, trailing center panel, asymmetric such its surface larger than surface. present can also include lubricant system has opening leg, various wear resistant coatings inserts on

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