US3969847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination manhole closure assembly and separate support ring
Assignee: Fosroc International Ltd
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Filing: 1974-11-18
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Granted: 1976-07-20
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Expires: 1994-11-18
Abstract
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.
Inventors
- 👤 Benjamin J. Campagna
- 👤 Samuel A. Campagna, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:50
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; E02D29/149; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
186 words
The combination of a manhole closure assembly for preventing storm water from entering into a manhole opening and a separate support ring for the assembly including a lower closure supporting flange, an upper flange spaced therefrom, and sealing means on the lower flange, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the sealing means on the lower flange and the cover plate comprising a pair of semi-circular segments, means for holding the semi-circular segments of the cover plate together at their diametral edge portions while allowing movement of at least one segment about a substantially horizontal axis in close proximity to its diametral edge portion, and spaced apart biasing means along the arcuate edge portions of the cover plate extending between the plate and the upper flange of the support ring for urging the plate against the sealing means until a pressure force acting upon the underside of the cover plate exceeds the force of the biasing means whereby the arcuate edge portions of the cover plate lift away from the sealing means to relieve such pressure force.
Claim 2
Dependent Claim
186 words
The combination of a manhole closure assembly for preventing storm water from entering into a manhole opening and a separate support ring for the assembly including a lower closure supporting flange, an upper flange spaced therefrom, and sealing means on the lower flange, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the sealing means on the lower flange and the cover plate comprising a pair of semi-circular segments, means for holding the semi-circular segments of the cover plate together at their diametral edge portions while allowing movement of at least one segment about a substantially horizontal axis in close proximity to its diametral edge portion, and spaced apart biasing means along the arcuate edge portions of the cover plate extending between the plate and the upper flange of the support ring for urging the plate against the sealing means until a pressure force acting upon the underside of the cover plate exceeds the force of the biasing means whereby the arcuate edge portions of the cover plate lift away from the sealing means to relieve such pressure force.
Claim 3
Dependent Claim
21 words
The combination of claim 1 including a handle secured to the upper side of each semi-circular segment of the cover plate.
Claim 4
Dependent Claim
36 words
The combination of claim 1 in which the separate support ring has a side wall portion interconnecting the upper and lower flange portions, and resilient material means secured to the outside of the side wall portion.
Claim 5
Dependent Claim
16 words
The combination of claim 1 in which the biasing means comprises a plurality of coil springs.
Claim 6
Dependent Claim
60 words
The combination of claim 1 in which the separate support ring has a side wall portion interconnecting the upper and lower flange portions, and in which the sealing means comprises an elevated portion in contact with the underside of the cover plate and a lower portion between the elevated portion and the side wall portion of the separate support ring.
Claim 7
Dependent Claim
21 words
The combination of claim 1 including sealing material between the diametral edge portions of the semi-circular segments of the cover plate.
Claim 8
Dependent Claim
221 words
The combination of a manhole closure assembly for preventing storm water from entering into a manhole opening and a separate support ring for the assembly including a lower closure supporting flange, an upper flange spaced therefrom, and sealing means on the lower flange, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the sealing means on the lower flange and the cover plate comprising a pair of semi-circular segments, means for holding the semi-circular segments of the cover plate together at their diametral edge portions including a support bar secured to the underside of one of the semi-circular segments along the diametral edge portion thereof and extending therefrom, the diametral edge portion of the other semi-circular segment resting upon the support bar, and means on the upper side of the cover plate urging the other semi-circular segment against the support bar, and spaced apart biasing means along the arcuate edge portions of the cover plate extending between the plate and the upper flange of the support ring for urging the plate against the sealing means until a pressure force acting upon the underside of the cover plate exceeds the force of the biasing means whereby the arcuate edge portions of the cover plate lift away from the sealing means to relieve such pressure force.
Claim 9
Dependent Claim
221 words
The combination of a manhole closure assembly for preventing storm water from entering into a manhole opening and a separate support ring for the assembly including a lower closure supporting flange, an upper flange spaced therefrom, and sealing means on the lower flange, the closure assembly including a substantially circular cover plate the arcuate edge portions of which engage the sealing means on the lower flange and the cover plate comprising a pair of semi-circular segments, means for holding the semi-circular segments of the cover plate together at their diametral edge portions including a support bar secured to the underside of one of the semi-circular segments along the diametral edge portion thereof and extending therefrom, the diametral edge portion of the other semi-circular segment resting upon the support bar, and means on the upper side of the cover plate urging the other semi-circular segment against the support bar, and spaced apart biasing means along the arcuate edge portions of the cover plate extending between the plate and the upper flange of the support ring for urging the plate against the sealing means until a pressure force acting upon the underside of the cover plate exceeds the force of the biasing means whereby the arcuate edge portions of the cover plate lift away from the sealing means to relieve such pressure force.
Claim 10
Dependent Claim
21 words
The combination of claim 7 including a handle secured to the upper side of each semi-circular segment of the cover plate.
Claim 11
Dependent Claim
36 words
The combination of claim 7 in which the separate support ring has a side wall portion interconnecting the upper and lower flange portions, and resilient material means secured to the outside of the side wall portion.
Claim 12
Dependent Claim
16 words
The combination of claim 7 in which the biasing means comprises a plurality of coil springs.
Claim 13
Dependent Claim
21 words
The combination of claim 7 including sealing material between the diametral edge portions of the semi-circular segments of the cover plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |