Hughes Tool Company LLC

Leon B Stinson

Edward M Galle

William L Shepherd

Disclosed herein is a drill bit for earth boring, including a lubrication system that eliminates necessity for a complex system to accomplish pressure compensation. Since the temperature of the earth generally increases with depth from the surface, a drill bit experiences increasing temperature with increasing depth. The coefficient of thermal expansion of lubricant inside a bit is greater than that of the metal defining the walls of the lubricant cavities. Internal bearing lubrication pressure control is achieved utilizing thermal expansion of the lubricant, seal displacement, and a pressure relief valve.

Drill bit utilizing lubricant thermal expansion and relief valve for

Disclosed herein is a rock bit having a quick change connection for use with an auger drilling machine. The quick change connection comprises a female connection extending upwardly from the body of a conventional rock bit. The connection has polygonal sides that mate with matching surfaces of a male connection secured to a kelly. A pin extends through mating holes in the female and male connections for fastening. Thus the male connection is axially releasable from the female connection by removing the pin. This permits convenient change between the auger drilling system and the rock bit drilling system.

Rock bit with quick change connection

Disclosed herein is a rotary-percussion earth boring bit that has an improved geometric configuration to minimize fatigue failures and reduce manufacturing costs. The body of the bit is formed of a single mass of metal through which extends a single air course, without intermediate deflection or intersection, from a central portion of the upper, anvil surface to the face of the bit. The air course intersects this face in an off-set relationship with the axis of rotation of the bit. Button type inserts are included in the face and one insert is adjacent to both the air course and the centerline of the bit.

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Houston, TX, United States of America

Leon B Stinson