E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
61/4.6
E02F 5/10 (2006.01) E03F 3/06 (2006.01) E21B 7/30 (2006.01) F16L 55/165 (2006.01)
Patent
CA 1247869
ABSTRACT OF THE DISCLOSURE Apparatus and method are provided for enlarging an underground duct or removing irregularities in the wall of the duct. One form of the apparatus comprises an elongate segmented shell arranged around a longitudinal axis of the apparatus, the shell having outwardly-facing surface portions for engaging the wall of the duct and a trailing portion extending rearwardly of the shell in a longitudinal direction and having a diameter equal to, or approaching, the required duct diameter. The shell is expandable laterally with respect to the axis from a contracted configuration, in which at least a front end portion of the shell lies within a duct penetration diameter, to an expanded configuration, for engaging the duct wall of the duct over an area thereof and driving the area of the wall away from the axis, thereby to create a void within the duct for receiving the trailing portion when the apparatus travels forward in the duct.
470083
Borden Ladner Gervais Llp
I.p.d. Systems Limited
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