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专利名称：Internal pipe cutter发明人：Norman Obst,Dean Gray申请号：US08/623575申请日：19960328公开号：US05685078A公开日：19971111
摘要：A device for cutting pipe internally includes an annular cutter head having aplurality of circumferentially spaced openings therethrough, a stepped drive shaftextending from the cutter head and having a longitudinal bore therethrough and anadapter at the distal end of the drive shaft for connection to a rotary drive member. Afrustoconical mandrel has a threaded rod extending from one end thereof through theshaft bore to the distal end of the shaft where it threadably engages a nut heldstationary with respect to the drive shaft. The mandrel has a plurality of inverted T-shaped slots extending along the frustoconical side thereof, each slot receiving the T-shaped projection on a cutter body. Each cutter body has a rotatable cutter wheelmounted thereon, the wheel being adapted to project through a corresponding openingin the cutter head. Rotation of the drive shaft by the rotary drive member will causerotation of the mandrel and the threaded rod. The relative movement between thethreaded rod and the nut causes the rod to move through the nut so as to draw themandrel into the cutter head. Due to the sloping nature of the mandrel wall and theinterengagement between the T-shaped slots and projections the cutter bodies and thecutter wheels will be moved progressively radially outwards of the cutter head duringrotation of the drive shaft so that the cutter wheels can cut into the internal wall of the
pipe at a controlled progressive rate.
申请人：DEAN GRAY ENTERPRISES,OPTION MACHINE & REPAIR LTD.
代理机构：Jones, Tullar & Cooper, P
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