Man-hole assembly

Details Man-hole assembly Man-hole assembly

1975-02-28

1976-08-31

Kannan, Philip C.

Movable or removable closures

Removable closure

49465, E06B 332, E05C 2102

Patent

active

039771245

ABSTRACT:
A man-hole assembly includes a man hole cover, a surrounding frame, a housing in the frame, a projection provided in the cover and extending into the housing when the cover is mounted in the frame to close the man hole and a key for locking the projection in the housing. The key includes an upper plate and a parallelopipedic foot connected to the plate by a stem, the plate being provided on its short sides with downwardly-extending flanges.

REFERENCES:
patent: 795687 (1905-07-01), Cameron
patent: 1016081 (1912-01-01), McNulty
patent: 1131327 (1915-03-01), Caldwell
patent: 1165804 (1915-12-01), Quigley
patent: 1610123 (1926-12-01), Fairweather
patent: 1721831 (1929-07-01), Porter
patent: 1877996 (1932-09-01), Shanley

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