Patent ID: 7287584

Claim:
An anchoring device for use in a pipe, the pipe including an inner diameter with an annular recess formed therein, the annular recess having a length and having a diameter greater than the inner diameter of the pipe, the anchoring device comprising: a mandrel having an outer surface, an upper end and a lower end, the mandrel sized to move through the pipe in which it is to be used; a radially resilient anchor carriage mounted about the mandrel, the anchor carriage defining an inner surface and a substantially cylindrical outer surface, the anchor carriage having a length selected to be less than the pipe annular recess length and being sized to pass through the pipe when radially compressed and to have an outer diameter when radially expanded greater than the pipe inner diameter and interengaging grooves and elongate protrusions formed on the mandrel outer surface and on the anchor carriage inner surface, the interengaging grooves and elongate protrusions of the anchor carriage and the mandrel being selected to limit axial movement of the anchor carriage relative to the mandrel and to permit the anchor carriage to be compressed against the mandrel to fit inside the inner diameter of the pipe and to remain interengaged when the anchor carriage is expanded and latched into the annular recess of the pipe.