F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
285/51
F16L 19/00 (2006.01) F16L 5/10 (2006.01)
Patent
CA 1207815
ABSTRACT OF THE DISCLOSURE An annular gasket is provided to provide a leak proof seal between the surface of an opening through the wall of a manhole and the outer surface of a pipe which passes through said opening. The gasket is made of elasto- meric material and has a cross-section defining a radially outward T-shape portion embedded in the concrete of the manhole wall around the opening. The gasket further includes a radially inner enlargment tapering radially inwardly and terminated by a laterally directed lip. The enlargment and lip are flexed by the pipe inserted through the opening with the maximum thickness of the enlargment forming a seal- ing ridge contacting the pipe in a first zone and with the lip also contacting the pipe in a second zone with a void between the first and second zones. The surface of the manhole opening has a channel for receiving the anchoring part of the gasket and on each side of the channel two frusto- conical surface portions of different minimum diameter; the frusto-conical surface portion of lesser minimum diameter being disposed on the side of the lip and acting as a solid stop for the pipe when subjected to abnormally high shearing force so that the portion of the gasket diametrically opposite said stop will not disengage the pipe.
492634
Gilbert Noel
Lesperance Pierre
LandOfFree
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