Manway lift assist

Movable or removable closures – With means mounting closure for swinging – With biasing means

Patent

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Details

E05F 110

Patent

active

050385208

ABSTRACT:
The invention relates to an improved balancing aid for a pivotally mounted cover for a manhole comprising means for hinging the cover relative to the manhole so the cover may be rotated about the hinge to expose and cover the manhole; and a spring retaining means comprising a rod pivotally secured to the cover, said rod being at least partially encased by a housing, said housing containing a compression spring means which is compressed when the cover is closed; wherein the improvement comprises securing the spring retaining means by attachment means which may be removed only after the spring means is first removed.

REFERENCES:
patent: 2589427 (1952-03-01), Ossmann
patent: 2593379 (1952-04-01), Wueste
patent: 2716256 (1955-08-01), Wise
patent: 3714680 (1973-02-01), Little
patent: 4010572 (1977-03-01), Peterson
patent: 4137669 (1979-02-01), Nunlist
patent: 4589613 (1986-05-01), Opsahl
patent: 4844567 (1989-07-01), Chalabian
patent: 4985939 (1991-01-01), Otte

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