Reverse circulation hammer with modular bit
OwnerTimothy W. Conninventor
Life of this patent
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Abstract
Embodiments provide apparatuses and methods for excavation and drilling, particularly reverse circulation hammers and bits. Reverse circulation hammers and bits manufactured in accordance with various embodiments may help to prevent fatigue and breaking of the bit during a drilling operation, may prevent clogging of return holes, may provide higher efficiency drilling operations, and may provide modular bit designs that may be interchanged to suit a particular drilling operation.
Claims22
A reverse circulation hammer and drill bit comprising:
- a drive sub configured to receive rotational torque;
- a back head coupled to the drive sub and configured to receive rotational torque therefrom;
- a porting barrel coupled to the back head and configured to receive rotational torque therefrom;
- a modular bit coupled to the porting barrel and configured to receive rotational torque therefrom;
- and
- a pneumatic reciprocating piston configured to transmit impact force to the modular bit via a modular bit shaft at a hammer impact area;
- wherein the hammer strike zone is does not receive rotational torque directly form the drive sub, back head, or porting barrel.
A modular drill bit for use with a reverse circulation hammer, wherein the drill bit comprises an outer drive ring and a bit face plate, and wherein the drill bit further comprises a plurality of vertical return holes configured to allow the passage of air, water, and/or debris through the bit face and up through the reverse circulation hammer.
Dependencies are inferred from the claim text.