Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1981-11-25
1983-07-19
Marcus, Stephen
Pipes and tubular conduits
With closures and plugs
Inflation stem type
F16L 5524
Patent
active
043939007
ABSTRACT:
A threaded insert plug for at least temporarily closing an opening in an internally threaded member. The plug member comprises a right circular cylinder closed at the lower end thereof. The closing surface includes an upstanding central portion proportioned to permit the application of a wrench and may include a screwdriver slot on an upper surface. The interior of the cylinder includes critically positioned projections and/or depressions which permits use of a lever having an end positioned against the projection or depression and a mid-portion against at least part of the upstanding central portion to permit the production of a turning torque. The surface irregularities may be configured and positioned to permit engagement with a suitable wrench. The walls of the plug may have generally uniform thickness thereby providing an economical and minimum weight plug. The upper surface of the upstanding central portion rises no further than the plane including the upper limit of the plug member. This facilitates use of the plug with a coupling to provide a penetration in a poured concrete wall or any other application where flush mounting is expedient.
REFERENCES:
patent: 506531 (1893-10-01), McManus et al.
patent: 712094 (1902-10-01), Raymond
patent: 1148545 (1915-08-01), Serry
patent: 1446361 (1923-02-01), Van Leer
patent: 1569875 (1926-01-01), Nixon
patent: 1806932 (1931-05-01), Burnish
patent: 3195762 (1965-07-01), Senoff
Gajajiva Padej
Wium Eigil
General Signal Corporation
Killian George W.
Marcus Stephen
Thronson Mark John
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