Patent ID: 6431293
Filing Date: 2002-08-13
Classification: E21B,F16C,Y10S

Abstract:
A drill bit for use in a borehole, comprising:a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween, wherein at least one of said bit components includes an annular groove having first and second circumferentially adjacent regions, wherein the width of said first circumferentially adjacent region is greater than the width of said second circumferentially adjacent region; an annular primary seal disposed between said leg and said roller cone; and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, wherein said annular secondary seal is disposed within said annular groove.