Manhole extension assembly

Details Manhole extension assembly Manhole extension assembly

1978-03-30

1980-02-12

Byers, Jr., Nile C.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 21, 210164, 404 25, E02D 2914

Patent

active

041881516

ABSTRACT:
Plastic extender rings for manholes are produced and are seated on the top ring of a manhole by the use of caulking or other adhesive material. The manhole cover, which is elevated by the plastic ring or rings from the old pavement level to a new pavement level, renders the manhole cover less noisy to traffic and seated more evenly. Recessed or notched portions of the rings receive the asphalt to arrest rotational and upward movement of the rings. Composite adapter rings are provided to adapt an off size manhole top rings, to a standard size manhole cover. Plastics are employed which will not melt at the application temperature of asphalt but will soften somewhat to conform better to the contour of the manhole cover and/or underlying manhole top ring.

REFERENCES:
patent: 1459588 (1923-06-01), Hoffman
patent: 1940924 (1933-12-01), Taylor
patent: 2314682 (1943-03-01), Becket
patent: 2431082 (1947-11-01), Sayles
patent: 2593918 (1952-04-01), Redman
patent: 3217619 (1965-11-01), Driver
patent: 3240133 (1966-03-01), Ross
patent: 3308727 (1967-03-01), Hurt
patent: 3362425 (1968-01-01), Morris
patent: 3408778 (1968-11-01), Mason

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