Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1991-12-09
1994-01-04
Dorner, Kenneth J.
Road structure, process, or apparatus
Pavement
Vault cover-closure
E02D 2914
Patent
active
052755010
ABSTRACT:
A quick opening manhole cover assembly is provided which is suitable for use with virtually any shape manhole cover of a pressure vessel. The assembly broadly includes a manhole cover having outer dimensions which are less than the inner dimensions of the manhole so that the cover can pass freely therethrough. The assembly also includes a structure for raising and lowering the cover into and out of the manhole. A sliding lock mechanism is located above the cover and is engageable to prevent axial movement of the cover. A safety mechanism is provided to prevent the lock from disengaging when the vessel is under pressure. Once the lock is engaged, the cover is raised and a seal carried atop the cover provides a fluid tight sealing engagement of the cover. The pressure within the vessel urges the cover further upward to further ensure the integrity of the seal.
REFERENCES:
patent: 3155116 (1964-11-01), Ver Nooy
patent: 4279356 (1981-07-01), Amorese et al.
patent: 4650365 (1987-03-01), Runnels
patent: 4763449 (1988-08-01), Vigneron et al.
patent: 4902165 (1990-02-01), Embree
patent: 4964755 (1990-10-01), Lewis et al.
Amorese Franklyn J.
Loomis Robert R.
Connolly Nancy P.
Dorner Kenneth J.
Dunn Michael L.
Simpson Robert P.
The Pfaudler Companies, Inc.
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