Adjustable height manhole with locking means

Details Adjustable height manhole with locking means Adjustable height manhole with locking means

1977-03-25

1978-02-28

Perham, Alfred C.

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

040757960

ABSTRACT:
This manhole consists primarily of a cast and internally threaded main body, which receives a cast and internally threaded sleeve, which may be raised to different pavement levels by means of a removable spanner wrench. It includes a pair of diametrically opposed and slidable locking plates, which have pin means on the underside for being received within openings on the upper interior of the sleeve, and the upper portion of the plates projects outwards of the sleeve, so as to lock the sleeve and cover within the main body, thus preventing rotation thereof, the plates when the sleeve is lowered or elevated, serving as a means of rendering the sleeve and cover stationary at various pavement levels.

REFERENCES:
patent: 829862 (1906-08-01), Ely
patent: 1541436 (1925-06-01), Reshan
patent: 3230844 (1966-01-01), Isaacs
patent: 3533199 (1970-10-01), Pickett
patent: 3629981 (1971-12-01), McCaffery

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