Sealed hard-rock drill bit

Details Sealed hard-rock drill bit Sealed hard-rock drill bit

E - Fixed Constructions

21

B

255/74

E21B 10/22 (2006.01)

Patent

CA 1210752

ABSTRACT OF THE DISCLOSURE A sealed, internally lubricated rotary roller drill bit for drilling hard earth formations in which internally disposed axially, thrust and ball anti-friction bearings are used in combination and in which a first seal means is provided for preventing the introduction of drilling debris and a second seal means is provided to prevent the introduction of such debris and to maintain the lubricant inside of the bit under pressure. A pressure relief means is provided to allow excess lubricant to flow around one of the seals. A stream of air is directed through the bit, first in a direction to "clean" the bore hole and in further directions to allow ready access to a lubricant fitting and to effect a seal at the interface between rotating portions of the bit.

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