Patent ID: 7543660
Filing Date: 2009-06-09
Classification: E21B

Abstract:
1. A roller cone drill bit comprising: a bit body having at least one support arm extending therefrom; each support arm having an interior surface and an exterior surface with a spindle extending inwardly from the interior surface; a respective cone assembly rotatably mounted on each spindle; each cone assembly having a backface disposed adjacent to and spaced from the interior surface of the associated support arm; at least one hole formed in the interior surface of each support arm; each hole extending from an opening in the interior surface of the associated support arm to a closed end disposed within the associated support arm; a respective debris diverter plug slidably disposed within each hole; each debris diverter plug having a first end operable to extend from the respective hole and a second end disposed within the respective hole; at least one fluid passageway extending from the interior surface of the associated support arm to a location proximate the second end of the associated debris diverter plug; and each fluid passage operable to communicate fluid containing debris between the interior surface of the associated support arm and the second end of the diverter plug.