Pipe bursting and replacement apparatus and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Nov 4, 2004
app pub date -
Apr 30, 2004
filing date -
May 2, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A pipe bursting and pulling apparatus for use in replacing horizontal underground pipes including a cylindrical body with a tapered forward section including means for attaching one of a cable, rod, rope or chain, the cylindrical body including an annular inner wall defining a longitudinally extending, rearwardly opening recess, a shaft passing through the recess, a plurality of gripping jaws, at least one of the jaws including a pipe gripping tooth extending radially outward relative to a longitudinal axis of the shaft, a tapered expander connected to the shaft and configured to fit between the jaws, the expander forcing the jaws outward to clamp a replacement pipe inserted into the cylindrical body between the jaws and the inner wall when pulled by the shaft, a stop, the stop limiting the forward travel of the expander and preventing outward radial travel of the jaws after the tooth has been engaged in the wall of the replacement pipe whereby the tooth penetrates to a depth of no more than 35% of the thickness of the wall of the replacement pipe.
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