Concrete pipe lift hole plug

Details Concrete pipe lift hole plug Concrete pipe lift hole plug

1979-08-13

1981-04-21

Bryant, III, James E.

Pipes and tubular conduits

With closures and plugs

Inflation stem type

138 92, 138 94, 138 98, 152370, 220213, 220307, 220352, 220DIG13, 220DIG19, 411456, F16L 5516

Patent

active

042627010

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.

REFERENCES:
patent: 733014 (1903-07-01), Cox
patent: 821041 (1906-05-01), Kinney
patent: 1287042 (1918-12-01), Kennedy
patent: 1800173 (1931-04-01), Anderson
patent: 2420353 (1947-05-01), Burrows
patent: 3477334 (1969-11-01), Stone et al.
patent: 3532372 (1970-10-01), Stroud

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