E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
189/12
E21B 7/26 (2006.01) E21B 7/20 (2006.01) E21B 7/28 (2006.01) E21B 7/30 (2006.01) E21B 29/10 (2006.01) F16L 55/165 (2006.01) F16L 55/18 (2006.01)
Patent
CA 1293207
ABSTRACT OF THE DISCLOSURE Novel apparatus is provided herein for travelling through an underground duct and for removing irregularities in, or enlarging, the duct. The novel apparatus includes two sets of expandable segmented shell portions arranged one in front of the other along a longitudinal axis of the apparatus. The shell portions are arranged around the longitudinal axis and have respective outwardly-facing outer surface portions for engaging the sides of the duct. The shell portions are movable laterally with respect to the longitudinal axis from a contracted con- figuration to an expanded configuration for forcing the sides of the duct away from the axis. The shell portions of the first set each are pivotally connected at front ends thereof to a front pivot assembly to define a first shell diameter, and the shell portions of the first set each are pivotally connected at rear ends thereof to front ends of respective shell portions of the second set. The shell portions of the second set each are pivotally connected to a rear pivot assembly to define a second, larger shell diameter. The shell portions of each set overlap each other along their full length so as to enclose an internal space throughout the pivotal movement of the shell portions between the contracted configuration and the expanded configuration.
537788
Borden Ladner Gervais Llp
Miller Pipeline Corporation
LandOfFree
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