Patent ID: 6443658
Filing Date: 2002-09-03
Classification: E21B,F16L

Abstract:
A bursting ram to expand a bore for installing new pipe, without trenching, to an end point, where it can be disassembled and removed in a small space comprising:a) a fracturing mandrel, in a frusto conical shape, with a forward aperture of a diameter less than the initial bore, and whose diameter gets larger toward a rear aperture where the diameter is approximately the size of the new pipe; b) an anchor shaped assembly made up of 1) a shaft with an adjustable nut near one end; and 2) a T piece on the other end having a length longer than its width; c) two parallel cross pieces spaced apart a distance more than the width but less than the length of the T piece; d) the two cross pieces connected to the leading end of the new pipe, perpendicular to the length of the fracturing mandrel and pipe; e) the anchor shaft is assembled with the T piece end exiting the rear aperture of the fracturing mandrel in a first position the T piece oriented so that it fits between and rearward of the two cross pieces, and the other end of the shaft extending out the front aperture of the fracturing mandrel with the adjustable nut forward of the fracturing mandrel; f) where the anchor assembly is movable to a second position, by rotating the anchor about the axis of the shaft to where the lengthwise portion of the T piece is nearly perpendicular to and still behind the two cross pieces such that the T piece is abutted up against the cross pieces and cannot pass between the cross pieces; and g) the nut is adjusted to hold the shaft and T piece in this second position by abutting the forward aperture of the fracturing mandrel forming a clamping action with the T piece.