Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground feed means
Patent
1980-05-28
1982-02-09
Pate, III, William F.
Boring or penetrating the earth
With below-ground tool drive prime mover
With below-ground feed means
175 95, 175106, 175107, E21B 402
Patent
active
043146155
ABSTRACT:
A self-propelled drilling head comprises a base section including gripper shoes mounted for extension and retraction to selectively grip the wall of a hole being drilled. A first actuator is provided for extending and retracting the gripper shoes. A drilling section is mounted on the base for reciprocation relative thereto. A second actuator is provided for urging the drilling section downwardly relative to the base section when the gripper shoes are extended. A cutter bit is mounted at a lower end of the drilling section. A third actuator is provided for rotating the cutter bit and comprises a first hydraulic motor having a first output shaft. A second hydraulic motor is spaced below and laterally offset from the first hydraulic motor and has a second output shaft extending parallel to the first output shaft. A driven gear is mounted at the end of each output shaft. A drive transmitting gear mechanism is meshingly engaged on opposite sides by the driven gears. A first conduit supplies pressurized hydraulic fluid to the first and second motors. A second conduit conducts hydraulic fluid from the first and second motors. A power transmitting mechanism operably connects the drive transmitting gear to the cutter bit to rotate the latter.
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Palmer Oliver E.
Sodder, Jr. George
Pate III William F.
Sodder, Jr. George
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