Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – Rotation of bit actuates lubricant feed means
Patent
1981-05-04
1983-06-28
Novosad, Stephen J.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
Rotation of bit actuates lubricant feed means
384 93, E21B 1024
Patent
active
043900720
ABSTRACT:
Discloses a lubricant circulating system for a rotary drilling bit including a lubricating space defined between a rotary cone cutter and a journal shaft extending from the bit body, the body defining a lubricant supply passageway connecting the lubricating space with a substantially cylindrical inlet chamber of a lubricant reservoir and with the centerline of the supply passageway being disposed substantially tangential with the cylindrical wall of said inlet chamber to form a restrictive vortex flow passage from the supply passageway into said reservoir and a nonrestrictive return flow passage, the body defining a lubricant exhaust passageway connecting the lubricating space through a substantially cylindrical outlet chamber into a discharge passageway forming part of the reservoir and with the centerline of the discharge passageway being disposed substantially tangential with the cylindrical wall of the outlet chamber to form a restrictive vortex flow passage from the reservoir into the outlet chamber and exhaust passageway and a non-restrictive return flow passage. Repeated volumetric variations in the lubricating space cause lubricant flow in the direction of least flow restriction which is from the reservoir into the inlet chamber, through the lubricating space and out of the discharge passage to the reservoir.
REFERENCES:
patent: 3841422 (1974-10-01), Crow
patent: 3990525 (1976-11-01), Penny
patent: 4183416 (1980-01-01), Walters
patent: 4284151 (1981-08-01), Levefelt
Falk Joseph
Globe Oil Tools, Inc.
Novosad Stephen J.
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