Sealing system for an earth boring cutter

Abstract From the Canadian patent

Abstract of the Disclosure, A sealing system acts as a barrier to the drilling fluid, pulverized cuttings and other materials in the borehole preventing the materials from entering the bearing area of an earth boring cutter unit and retains lubricant inside the bearing area. At least one bearing pin extends from the body of an earth boring bit and a rolling cutter is mounted on the bearing pin. A seal unit is located between the mouth of the cutter and the bearing pin. The radial to axial relationship of the seal unit is more than one-to-one and less than one-and-one-half-to-one. The seal unit is compressed less than 10% when the rolling cutter is assembled on the bearing pin. -1a-