Patent ID: 8353354

Claim:
A crawler system for an earth boring system, comprising: at least two expandable tools disposed along a common axis spaced apart from each other along the common axis; wherein each of the at least two expandable tools comprises a mandrel comprising a tubular body and an outer diameter, a plurality of blades, and a slidable sleeve capable of manipulating the plurality of blades into collapsed and expanded positions; wherein when the plurality of blades of one of the at least two expandable tools is in an expanded position the plurality of blades engage a borehole wall; further comprising a piston cylinder device disposed between the at least two expandable tools which anchors against the engagement between the borehole wall and one of the at least two expandable tools to axially translate the other of the at least two expandable tools; and wherein the piston cylinder device comprises a cylinder connected to the mandrel of at least one of the expandable tools and a piston connected to the mandrel of another of the expandable tools.