E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/74
E21B 10/22 (2006.01)
Patent
CA 1227789
ROLLER CUTTER DRILL BIT HAVING A TEXTURIZED SEAL MEMBER Abstract of Disclosure A rotary drill bit comprising a bit body having at least one depending leg at its lower end having a generally cylindrical bearing journal, a roller cutter of generally conical shape having a recess therein receiving the journal a bearing system for rotatably mounting the roller cutter on the journal, and a lubrication system for providing lubricant to the bearing system comprising a reservoir of lubricant, passaging in the bit body for fluid communication between the reservoir and the bearing system, and a seal member between the roller cutter and the journal blocking flow of lubricant out of the bit body. The seal member is of annular shape and is held in a seal cavity between the roller cutter or the journal, with an annular engagement face thereof in sealing, sliding frictional engagement with one of the bearing members. The engagement face of the seal member has a surface texture such that, with the seal member compressed against the stated one bearing member, pockets are formed in the face thereof for holding lubricant for lubricating the seal member, yet the face is effective to substantially block leakage past the seal member.
491388
Daly Jeffery E.
Kotch Robert J.
Camco International (uk) Limited
Meredith & Finlayson
Reed Tool Company
LandOfFree
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