Patent ID: 6619412
Filing Date: 2003-09-16
Classification: E21B

Abstract:
A rotary cone rock bit, comprising:a bit body including a plurality of legs extending therefrom, each of said legs having an outer surface that includes a leading surface, a center panel surface, a trailing surface and a shoulder; a roller cone rotatably supported on each of said legs; a sealed and lubricated bearing system between each cone and the leg on which it is supported; and a lubricant reservoir in fluid communication with said bearing system, said reservoir having an installation opening positioned completely within one of said center panel surfaces; wherein a portion of said shoulder extends radially outwardly above said opening a first distance that is approximately equal to between about 50% and about 100% of the radial dimension of said opening and wherein said extended shoulder portion comprises a separate piece that is rigidly affixed to said bit body.