E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/73
E21B 10/00 (2006.01) E21B 10/18 (2006.01) E21B 10/22 (2006.01) F16C 17/24 (2006.01) F16C 19/52 (2006.01) F16J 15/34 (2006.01) F16J 15/40 (2006.01)
Patent
CA 1087163
ROTARY ROLLER BIT WITH IMPROVED SEAL MEANS Abstract of the Disclosure The present invention provides an improved means for sealing-the roller cutter lubrication system in sealed roller bits. By providing an air barrier in a narrow space between the leg of the bit body and the rotary cutter it is possible to effectively protect any seal, located between the leg and the entry of the cutter, from being damaged. By providing a narrow space of suitable height it has been found possible to provide such over-pressure inside said space that an effective barrier of air under pressure is provided as an assistance to the seal means provided to seal the roller cutter lubrication system. This eliminates the risk for dirt and particles to penetrate into the bearing system of the cutter, thus improving the drilling life of the bearings and the drill bit.
300182
Gowling Lafleur Henderson Llp
Sandvik Aktiebolag
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