Rock drill bit with back-reaming protection

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means

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Details

175340, 175374, 175406, 175401, E21B 1018, E21B 1022

Patent

active

061163570

ABSTRACT:
A drill bit for boring a bore hole in an earthen formation comprises: a bit body having a pin end, a cutting end and a longitudinal bit axis and including at least two legs extending from the cutting end, each of the legs including a bearing that rotatably supports a cutter cone. The bit body further includes a fluid flow system, including a flowway in said pin end that is in fluid communication with at least one exit port in the cutting end, the exit port being defined by a nozzle boss and disposed adjacent one of the legs. Each of the legs includes a leading side surface, a trailing side surface, and a center panel, and at least one of said legs is asymmetric such that its trailing side surface is larger than its leading side surface. The present bit can also include a lubricant system that has its opening in the trailing side of the leg, and can further include various wear resistant coatings and inserts on its surface.

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Smith Tool; Feature Bulletin; Feature Leg Back Protection; Exhibits 2-6; date: prior to filing of present application.
Sandvik Rock Tools; Raise Boring Equipment; Exhibits 7A and 7B; date: prior to filing of present application.

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