Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1990-04-02
1991-02-26
Britts, Ramon S.
Road structure, process, or apparatus
Pavement
Vault cover-closure
404 25, 49465, E02D 2914
Patent
active
049957570
ABSTRACT:
In a street manhole defining an elongated manhole duct provided with a rigid collar at its top mouth, the collar having a radially inward annular cavity defining a base wall, parallel to the plane of the collar and a side wall, orthogonal to the base wall. The collar further defines a top wall parallel to the base wall. A spacer device is provided for raising the cover level from the collar base wall, and defines: (a) a first rigid ring, destined to sit on the collar base wall; (b) a second rigid ring, diametrally larger than the first ring and destined to sit on the collar top wall; and (c) connecting tongues, for coaxially interconnecting the rings about spaced planes, the connecting tongues being flexible and capable of bending under load, so as to bring the first ring to sit against the collar base wall and the second ring to sit against the collar top wall. The tongues will bend longitudinally so as to pivot about their lengthwise axes upon being responsive to a biasing load being applied transversely to the plane of at least one of the cover member and the second ring.
REFERENCES:
patent: 3891337 (1975-06-01), McCoy
patent: 4188151 (1980-02-01), Hall
patent: 4337005 (1982-06-01), LeBaron
patent: 4690584 (1987-09-01), Lebaron
patent: 4925337 (1990-05-01), Spiess et al.
Britts Ramon S.
Schoeppel Roger J.
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