Patent ID: 8931582
Filing Date: 2015-01-13
Classification: B23B,E21B

Abstract:
1. A rotary drill bit for drilling a subterranean formation, the rotary drill bit comprising: a bit body having an external surface, the external surface including a gage portion that is configured to engage a subterranean formation; at least one cutting element rotatably coupled to the bit body such that at least a portion of the at least one coffin element protrudes from the external surface of the bit body; at least one clutch mechanism associated with the at least one cutting element, the at least one clutch mechanism configured to selectively permit or inhibit the application of torque to the at least one cutting element, wherein the at least one clutch mechanism and the at least one cutting element are structured to effect rotation of the at least one cutting element relative to the external surface of the bit body when sufficient torque is applied to the at least one cutting element.