Balancing mechanism for manhole covers

Details Balancing mechanism for manhole covers Balancing mechanism for manhole covers

1978-02-08

1979-02-06

Kannan, Philip C.

Movable or removable closures

With means mounting closure for swinging

With biasing means

49402, E05F 110

Patent

active

041376692

ABSTRACT:
A balancing mechanism for manhole covers uses two sets of conical disc springs, one stronger than the other, mounted on a common pull rod, to balance the cover as it moves from the open vertical position to the closed position. This provides a progressive spring force curve that balances the manhole in any position between the closed position and the vertical position. The balancing mechanism is also provided with an additional set of disc springs that absorb shock when the cover is opened rapidly. The mechanism is preferably mounted on a nozzle protection ring, which allows the system to be installed on existing glass lined vessels without welding, drilling or similar operations which might damage the lining.

REFERENCES:
patent: 1989908 (1935-02-01), Bohnsack et al.
patent: 2357044 (1944-08-01), Wagner
patent: 3615134 (1971-10-01), Newcomb
patent: 3665958 (1972-05-01), Dunkelis
patent: 3714680 (1973-02-01), Little

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