Pipe bursting and replacement apparatus

  • US RE35,271 E
  • Filed: 01/06/1993
  • Issued: 06/11/1996
  • Est. Priority Date: 05/15/1990
  • Status: Expired due to Term
First Claim
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1. A pipe bursting tool for longitudinally slitting and laterally expanding a length of steel pipe, said tool having a forward end and a rearward end, comprising a substantially cylindrical portion including said forward end and whose diameter is smaller than the inner diameter of said pipe so as to be received therein, a truncated substantially conical spreader portion for laterally expanding said pipe and having a truncated apex end conjoining with said cylindrical portion and a base end adjacent to said rearward end of said tool which is substantially larger than said inner diameter of said pipe, said spreader portion having a conical surface-generating side element aligned with and forming a rearward extension of a cylindrical surface-generating side element of said cylindrical portion and together providing a straight side surface of said tool, said conical spreader portion thereby being eccentrically disposed with respect to the longitudinal axis of said cylindrical portion, and a fixed blade member mounted on and projecting outwardly from a second surface of said tool which is opposite to its said straight side surface, said blade member having an angularly rearward extending and forwardly facing cutting edge.

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