Manhole cover lifting apparatus

Details Manhole cover lifting apparatus Manhole cover lifting apparatus

1995-03-22

1996-07-02

Bagnell, David J.

Road structure, process, or apparatus

Pavement

Vault cover-closure

220331, E02D 2914

Patent

active

055315410

ABSTRACT:
A manhole cover is seated on a flange in a frame from which depends a skirt forming an access opening to a cavity. A cover lifting mechanism external the access opening includes an arm secured to the cover and a tubular cylinder fixed to the skirt, the cylinder including internal aligned journal bushings. A tubular shaft depends from the arm into the journal and axially displaces and rotates about the journal axis. The shaft has an axially extending central bore with a threaded portion. A threaded rod in the central bore rotates about the shaft axis and is captured to a bearing secured to the cylinder lower end. The rod upper end is squared to receive a socket wrench for manually turning the rod with a mechanical advantage which lifts the shaft, the arm and thus the cover out of its seat. Once lifted, the cover is readily rotated away from the access opening by rotating the shaft in the journal while the threads remain engaged.

REFERENCES:
patent: 1028499 (1912-06-01), Schott
patent: 1225679 (1917-05-01), Ransehousen
patent: 1634029 (1927-06-01), Korkames
patent: 3513605 (1970-05-01), Smith
patent: 3930739 (1976-01-01), Larsson et al.
patent: 4181290 (1980-01-01), Affolter
patent: 4461597 (1984-07-01), Laurin

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