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US 4,657,091 AGranted
Drill bits with cone retention means
OwnerRobert Higdoninventor
Life of this patent
Estimating the term…
Abstract
There is disclosed a drill bit which is connectable to the lower end of a rotary drill string for use in drilling oil and gas wells as drilling mud is circulated downward through the string, out the bit, and upwardly within the annulus between the string and well bore so as to remove cuttings therefrom. The bit has cones which are mounted for rotation about thrust bearings which extend inwardly from the lower ends of legs which depend from a shank at the upper end of the bit body which is attached to the drill string.
Claims17
A drill bit, comprising
- a body having an upper end for connection to a rotary drilling string and legs depending from its lower end,
- a journal bearing extending inwardly from each leg,
- a cone fittable over the end of each bearing for rotation thereabout,
- means forming a chamber between the walls of each bearing and cone,
- a liquid filling said chamber from which air has been displaced, and
- means seating said chamber,
- said sealing means including means on said cone and said hournal bearing sealing therebetween,
- said chamber being sealed to prevent leakage of air in or liquid out of the chamber to form a liquid lock which holds the cone on the bearing while permitting relative rotary movement between said cone and bearing and preventing any substantialy longitudinal movement between said cone and bearing.
5 more elements
A rotary tool comprising
- a supporting body,
- a tool member supported for rotation on said supporting body,
- means forming a chamber between the walls of said supporting body and tool member,
- a liquid filling said chamber from which air has been displaced, and
- means sealing said chamber,
- said sealing means including means on said tool member and said supporting body sealing therebetween,
- said chamber being sealed to prevent leakage of air in or liquid out of the chamber to form a liquid lock which holds the tool member on the supporting body while permitting relative rotary movement between said tool member and supporting body and preventing any susbstantial longtudinal moverent between said tool member and supporting body.
4 more elements
Dependencies are inferred from the claim text.