Patent ID: 7392862

Claim:
An earth boring bit, comprising: a bit body having a depending bearing pin, defining a base area at the junction of the body and the bearing pin; a rigid insert ring mounted on the bearing pin, the insert ring having an inner diameter greater than an outer diameter of the bearing pin, defining a clearance between the insert ring and the bearing pin to allow the insert ring to float relative to the bearing pin, the insert ring having a slot in its outer margin; an inner seal in sealing engagement with the bearing pin and the inner diameter of the insert ring; a cone rotatably mounted on the bearing pin, the cone having a cavity containing an outer seal groove; an outer seal in the outer seal groove and in dynamic sealing engagement with an outer diameter of the insert ring; and a pin secured to the body and extending into the slot on the outer margin of the insert ring to prevent rotation of the insert ring, the slot allowing floating movement of the insert ring relative to the pin.