Concrete pipe lift hole plug
OwnerRoger R. Beacominventor
Life of this patent
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Abstract
A plug for obturating the lift hole of poured concrete drain pipes or conduits. The plug, preferably made of a plastic molding, comprises a generally thin head in the form of a plate and a shank projecting from the lower surface of the plate. The shank has at least two substantially thin fins extending radially from a common centerline, each having a lateral edge engageable with the rim of the hole obturated by the plug. Preferably, the shank is cruciform and is provided with three or more fins.
Claims9
A plug comprising a head having a top surface and a bottom surface and a shank projecting from said bottom surface of said head, said head being substantially a thin plate and said shank having a centerline substantially orthogonal to said head bottom surface and extending from the center of said head bottom surface, said shank being formed of at least a pair of substantially thin plate flat fin-like members projecting substantially orthogonal to said head bottom surface, said fin-like members being interconnected along said centerline and each having an outer edge tapering from said head bottom surface to the end of said shank and each being disposed in a plane extending radially from said common centerline.
Dependencies are inferred from the claim text.