Combination manhole closure assembly and separate support ring

Details Combination manhole closure assembly and separate support ring Combination manhole closure assembly and separate support ring

1974-11-18

1976-07-20

Novosad, Stephen J.

Static structures (e.g., buildings)

Controlled by condition responsive means

52 19, 52173R, 1375121, E02D 2914

Patent

active

039698475

ABSTRACT:
Combination includes manhole closure assembly for preventing storm water from entering into manhole opening and separate support ring for assembly. Support ring has lower closure supporting flange with upper flange spaced therefrom, and sealing material is provided on lower flange. Closure assembly includes substantially circular cover plate engaging sealing material, and cover plate comprises pair of semi-circular segments. Structure is provided for holding semi-circular segments of cover plate together at diametral edge portions thereof. Spaced apart biasing structure is located along arcuate edge portions of cover plate, and such structure extends between plate and upper flange of support ring for urging plate against sealing material. When pressure force acting upon underside of cover plate exceeds force of biasing structure, arcuate edge portions of cover plate lift away from sealing material to relieve such pressure force.

REFERENCES:
patent: 793214 (1905-06-01), Neuhaus
patent: 1238878 (1917-09-01), Bravo
patent: 1281406 (1918-10-01), Marquess
patent: 2663268 (1953-12-01), Ahnell
patent: 2679860 (1954-06-01), Diebold
patent: 2943582 (1960-07-01), Bonanno
patent: 3415272 (1968-12-01), Blackhawk
patent: 3538946 (1970-11-01), Hilsheimer
patent: 3712009 (1973-01-01), Campagna
patent: 3831628 (1974-08-01), Kintner

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