F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
254/30
F16L 1/00 (2006.01) E03F 9/00 (2006.01)
Patent
CA 1212662
ABSTRACT OF THE DISCLOSURE A devise is provided for removing irregularities in or enlarging an underground duct. The device includes a rear portion having a generally cylindrical outer surface corresponding sub- stantially to the required diameter of the duct and a segmental front portion. The front portion has a set of leaf members which are movable transversely relative to a longitudinal axis of the device between a defined retracted configuration and a defined expanded configuration. Drive means are provided for moving the leaf members between their retracted and expanded configurations. In operation, the apparatus is drawn through the duct with the leaf members in a retracted position, until an irregularity in the duct causes resistance to forward movement. The ram is operated to force the leaf members outwardly against the wall of the duct to remove the irregularity. The leaf members are then retracted as the apparatus is drawn forward to the next obstruction. The apparatus is particularly intended to repairing damaged sewers prior to fitting an inner lining pipe.
430705
Borden Ladner Gervais Llp
Yarnell Ian R.
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