Nozzle retention system for rock bits
AssigneeSmith International, Inc.
InventorsJames L. Larsen, Michael A. Siracki
Life of this patent
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Abstract
A nozzle retention receptacle for rotary cone rock bits consists of a nozzle retention receptacle body forming a fluid passage therethrough. The body forms a first upstream entrance end that forms part of a wall of a plenum formed within a rock bit body and a second downstream exit end. The upstream end further forms a mounting interface that circumvents a fluid entrance port to the passage in the nozzle retention receptacle. The port communicates with the fluid plenum in the bit body. The body of the rock bit further forms a nozzle retention receptacle mounting interface that is common to the mounting interface formed by the nozzle retention receptacle.
Claims11
A rock bit body rotating about an axis having an interior plenum for allowing fluid to pass therethrough further comprising;
- a nozzle retention body having an upper end for attachment to the rock bit body and a lower end for retaining a nozzle, the nozzle retention body having an interior channel passing therethrough, the upper end, when attached to the rock bit body, forming a portion of the interior plenum, the rock bit body further including an interface surface and the nozzle retention body further including an interface surface which mates with the interface surface of the rock bit body, the upper end of the nozzle retention body forming an interface surface that is a convex radial curved surface that encompasses a fluid entrance port forming part of the interior channel, the rock bit body further forming a complimentary concave radial curved interface surface, the convex radial curved surface at the upper end of the nozzle retention body protruding into the plenum formed by the rock bit body, the radial curved interface surfaces enable the nozzle retention body to be angled radially with respect to the axis of the rock bit.
A rock bit body having an interior plenum for allowing fluid to pass therethrough further comprising;
- a nozzle retention body having an upper end for attachment to the rock bit body and a lower end for retaining a nozzle, the nozzle retention body having an interior channel passing therethrough, the upper end, when attached to the rock bit body, forms a portion of the interior plenum, an exterior radially disposed upper surface formed by the nozzle retention body having a multiplicity of hardened cutters strategically positioned on the upper surface, the hardened cutters serve as backreamers to clear debri from the rock bit when the bit is removed from a borehole.
Dependencies are inferred from the claim text.