F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 21/00 (2006.01) E02D 5/60 (2006.01) E03C 1/122 (2006.01) E03F 5/08 (2006.01) F16L 25/10 (2006.01) F16L 59/15 (2006.01)
Patent
CA 2063304
Abstract of the disclosure A sleeve covering to surround a vent pipe which is to be buried and inserted into and connected to a T-fitting trap of a sanitary sewer system is described which sleeve covering will prevent the frost or frozen earth from heaving the pipe which it surrounds. The repeating sleeve covering is basically a number ofhollow vertical sections or coupling members, generally cylindrical in shape, whose inside diameter of the bottom portion of each is slightly greater than thepipe which it surrounds. Vertical movement of the sleeve sections or coupling members (one or more or all) is possible without causing any vertical movement of the pipe that the sections surround. Also, because of the particular exteriorshape (frusto-conical) of the top portion of each section, the exterior forces exerted upon same by the earth when it freezes actually tends to force the sleeve sections downward rather than upward. Also, because the sleeve covering is madeup of a number of coupling members, the heaving forces exerted by the earth can he restricted to act upon an individual sleeve section and/or to act upon only alimited few such sleeve sections rather than upon the entire sleeve covering. The invention also includes a novel and greatly improved method of connecting the vent pipe to the T-fitting trap of the sewer system.
Bergey Michael J.
Swabey Ogilvy Renault
LandOfFree
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