Back to results
US 4,381,824 AGranted
Drill bit lubrication system
AssigneeReed Rock Bit Company
InventorPaul E. Pastusek
Life of this patent
Estimating the term…
Abstract
A lubrication system is disclosed for a rolling cutter drill bit, which system utilizes solid or semi-solid sticks of lubricants located in internal channels and continuously biased against rotating surfaces in the bit.
Claims8
In a non-sealed rolling cutter drill bit having at least one bearing journal shaft and a rolling cutter rotatably mounted on the shaft and having at least one flat interior end face in rotary bearing contact with the end of said bearing journal shaft to support end thrust loads, the improvement comprising:
- at least one lubricant rod slidably mounted in said shaft for longitudinal movement therein and arranged to contact said flat interior end face of said rolling cutter;
- and,
- biasing means associated with said lubricating rod and arranged to urge said rod against said flat interior end face during rotation of said rolling cutter to lubricate the end thrust bearing surfaces thereof.
A rolling cutter drill bit having a plurality of downwardly extending lugs,
- each having a cantilevered bearing journal extending downwardly therefrom,
- and a rolling cutter rotatably mounted on each said bearing journal by bearing means and having at least one flat interior end face in rotary bearing contact with the end of said bearing journal to provide an end bearing for supporting end thrust loads, the improvement comprising
- at least one bore passage formed in said bearing journal and communicating with the end thereof;
- a lubrication stick slidably located in said bore passage and arranged to contact said flat interior end face of said rolling cutter, and,
- biasing means arranged to bias said lubrication stick out of said passage against said flat interior end face during rotation of said rolling cutter to lubricate the end thrust bearing surfaces thereof.
2 more elements
Dependencies are inferred from the claim text.