Center Rock Inc.

Austin C Hine

Warren Thomas Lay

An underreamer drill hammer comprising a canister including a housing having an outer diameter, a proximal end configured for attachment to a drill string, and a percussive drill hammer housed within the housing, the percussive drill hammer having a drill bit movable between a radially retracted position and a radially extended position. The drill bit can rotate and is designed in a manner that the drill bit head cams, pivots, or swings out to a larger cutting diameter when the system is rotated in a first direction. The system is rotated in a second direction to retract the bit heads. The bits are retracted to remove the canister from the casing or to drill a smaller diameter hole through rock.

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New Florence, PA, United States of America

Austin C Hine