Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1990-02-16
1992-03-31
Cuchlinski, Jr., William A.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138113, 52 98, 235901, 247 11, 247 39, 42521, F16L 5510, E04B 100
Patent
active
050998870
ABSTRACT:
A collar for a drain pipe riser is provided for maintaining an annular space about the periphery of the riser during the pouring of a floor about the riser. The collar includes inner and outer sleeves separated by a plurality of knock-out webs. The inner sleeve is adapted to fit over the riser while the outer sleeve insures an annular space will be maintained about the riser during pouring of the floor. The webs can then be knocked out, and the inner sleeve and webs removed.
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Bennet G. Bradley
Cuchlinski Jr. William A.
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