Self-propelled earth drilling hammer-bit assembly

Details Self-propelled earth drilling hammer-bit assembly Self-propelled earth drilling hammer-bit assembly

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) E21B 4/02 (2006.01) E21B 4/16 (2006.01) E21B 10/36 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2147431

The present invention is a self-propelled hammer-bit assembly for pneumatically drilling a borehole in the earth. It includes a hammer-bit member having an elongated main body with a hollow area therein and at least one blade located in the hollow area. The blade(s) is adapted to receive pressurized air to impart a rotation to the hammer-bit member which has a bit located at its distal end. The bit has at least one orifice to permit exit of pressurized air from the hollow area. For lateral stabilization with free rotation of the hammer-bit member, a bearing collar is connected to its elongated main body. There is also a distal barrel with the bearing collar connected thereto and the hammer- bit member located in the barrel collar. Finally, a reciprocation mechanism is located within the barrel and connected to the hammer-bit member to impart vertical reciprocation of the hammer-bit member in response to pressurized air. The invention also includes the hammer-bit member itself.

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