Manhole cover lifting device

Details Manhole cover lifting device Manhole cover lifting device

1978-12-15

1980-01-01

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Mechanically actuated

254131, B66F 1700

Patent

active

041812905

ABSTRACT:
A manhole cover lifter that is formed by a single arm lever structure with a pair of adjustable lifting jaws that penetrate and attach to a manhole cover to remove and relocate it. The arm also contains adjustable hooks that are for other cover configurations. The invention is stabilized by three retractable legs allowing the lifting arm to rotate horizontally. The lifting power of the arm is provided by an integral hydraulic jack or in other embodiments a hydraulic or pneumatic cylinder or a hand operated cable reel. A wire rope embracing a pulley attached to the vertical column provides a connection between the jack and the arm. This pulley is raised by the jack, or actuating means, subsequently elevating the arm into a vertical position where it is then rotated allowing the cover to be deposited radially away from the manhole.

REFERENCES:
patent: 2517813 (1950-08-01), Wallace
patent: 3121556 (1964-02-01), Faulkner
patent: 3883105 (1975-05-01), Matsumoto
patent: 3885688 (1975-05-01), Larsen

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