Manhole structure

Details Manhole structure Manhole structure

1981-04-30

1983-10-11

Murtagh, John E.

Static structures (e.g., buildings)

With entrance for persons or objects in horizontal or...

With additional enclosure structure; e.g., manhole

404 26, E02D 2914

Patent

active

044084218

ABSTRACT:
An improved manhole structure is disclosed which comprises a cover having a rim inclined inwardly at 45.degree., on which a plurality of protrusions are provided; a ring for elevating the cover, having an upright inner wall and outer wall and an upper face and lower face, both inclined inwardly at 45.degree., on the said upper face a plurality of holes are formed for engagement with the protrusions formed on the cover, and on the said lower face a plurality of protrusions are formed; and a base having an upper surface inclined inwardly at 45.degree., and a flat lower face, on the said upper surface a plurality of holes are formed for engagement with the protrusions formed on the lower face of the said ring.

REFERENCES:
patent: 2431082 (1947-11-01), Sayles
patent: 3308727 (1967-03-01), Hurt
patent: 4187647 (1980-02-01), Hall
patent: 4188151 (1980-02-01), Hall
patent: 4197031 (1980-04-01), Hild

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