Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
Reexamination Certificate
2008-03-18
2008-03-18
Gay, Jennifer H. (Department: 3676)
Boring or penetrating the earth
With self-acting cyclic advance and retraction of tool or...
C175S099000
Reexamination Certificate
active
11417535
ABSTRACT:
A hydraulically powered tractor adapted for advancement through a borehole including an elongate body, aft and forward gripper assemblies, and a valve control assembly housed within the elongate body. The aft and forward gripper assemblies are adapted for selective engagement with the inner surface of the borehole. The valve control assembly includes a gripper control valve for directing pressurized fluid to the aft and forward gripper assemblies. The valve control assembly also includes a propulsion control valve for directing fluid to an aft or forward power chamber for advancing the body relative to the actuated gripper assembly. Aft and forward mechanically actuated valves may be provided for controlling the position of the gripper control valve by detecting and signaling when the body has completed an advancement stroke relative to an actuated gripper assembly. Aft and forward sequence valves may be provided for controlling the propulsion control valve by detecting when the gripper assemblies become fully actuated. Furthermore, a pressure relief valve is preferably provided along an input supply line for limiting the pressure of the fluid entering the valve control assembly.
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Bloom Duane
Krueger, V Rudolph Ernst
Mock Phil
Moore N. Bruce
Bomar Shane
Gay Jennifer H.
Knobbe Martens Olson & Bear LLP
Western Well Tool, Inc.
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