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US 4,059,316 AGranted
Bearing retaining pin for earth boring drill
AssigneeReed Tool Company
InventorsJoseph A. Alvarez, Robert J. Mills
Life of this patent
Estimating the term…
Abstract
A roller cutter type earth boring drill having a ball bearing race filled with ball bearings through an external passage has the passage filled with a bearing retaining plug having a symmetrically cut end portion fitting the curvature of the bearing race.
Claims4
A roller cutter earth boring bit comprising:
- a bearing shaft arranged on said bit,
- a roller cutter mounted on said shaft,
- a peripheral bearing race on said shaft,
- a peripheral bearing race on the inner surface of said cutter and cooperating with said first named bearing race,
- a plurality of ball bearings positioned between said bearing races,
- a passageway in said shaft extending to said first named bearing race for introduction of ball bearings thereto,
- a bearing retaining pin secured in said passageway and having an end portion with a symmetrical surface curvature fitting the curvature of said first named bearing race to secure said ball bearings therein.
4 more elements
Dependencies are inferred from the claim text.