Drill bit assembly having improved operational lif

专利名称：Drill bit assembly having improved

operational life

发明人：Drummond, Donald David,Wood, Roy

Wilbert,Johnsey, Walter Frank

申请号：EP83306326.6申请日：19831018公开号：EP0106702A2公开日：19840425

专利附图：

摘要：A drill bit assembly has an elongated housing in which a drill is provided with agenerally cylindrical shape for receiving an enlarged tool end with somewhat greater

diameter, the tool having cutting cones for cutting a drill hole in material to be drilled.Air is fed to a plenum chamber within the housing out of which are fed two air flows. Thefirst flow is directed to the region of the cutting cones and is of reduced magnitudesufficient only for removing dust and cuttings away from the bit assembly up along thesides of the bit. A plurality of vanes are provided on the housing to direct the first flowinto a helical path the general pitch of the vanes. The vanes are caused to overlap oneanother in the direction of flow. A plurality of jet nozzles are provided from the plenumchamber at the side of the housing intermediate each pair of vanes and aligned so thatthe second flow will be in line with the first flow and generally parallel to the vanes in thegeneral direction of the drill end and away from the cutting cones. Centrifugal force thusimparted keeps particles away from the drill bit and the pipe extensions and therebyreduces wear.

申请人：DRUMCO

地址：P.O. Box 19 Jasper Alabama 35501 US

国籍：US

代理机构：Newby, John Ross

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