Electrically powered tractor

Details Electrically powered tractor Electrically powered tractor

2010-07-20

2011-10-04

Wright, Giovanna (Department: 3672)

Boring or penetrating the earth

With below-ground tool drive prime mover

With means to anchor prime movers support to bore wall

C175S051000, C175S097000, C175S104000, C175S230000, C166S216000

Reexamination Certificate

active

08028766

ABSTRACT:
An electrically powered and controlled tractor system includes one or more electric gripper assemblies and one or more electric power train assemblies. Power and control signals for the gripper assemblies and power train assemblies can be delivered from a ground surface via a wireline. The gripper assembly employs a motor-activated lead screw and nut combination to expand passage-gripping elements, preferably by pushing the gripping elements radially outward from locations between opposing ends of the gripping elements. A failsafe mechanism can retract the gripping elements during a power interruption. The power train assembly employs a motor-activated lead screw and nut combination to expand and contract two or more telescoping members. The tractor system can include multiple tractor units that each includes one gripper assembly and one power train assembly. A tractor can include one power train assembly and two gripper assemblies.

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