Patent ID: 7311294

Claim:
A jack bar, comprising an outer tube; an inner tube co-axially mated to the outer tube; and a positioner tube co-axial to the inner tube and the outer tube, the positioner tube is located in between the inner tube and the outer tube, the positioner tube includes a positioner to fix the location of the positioner tube with respect to the outer tube, the positioner tube including a drive mechanism to locate the inner tube with respect to the positioner tube, the positioner further including a clamp to clamp the inner tube in position with respect to the positioner tube, at least one positioning pin located on the outer surface of the positioner tube, and a spring pushing outward on the positioning pin from inside the positioner tube, where each positioning pin mates with a positioning hole on the outer tube thereby holding the positioner tube in place with respect to the outer tube.