Counterbalance spring means

Details Counterbalance spring means Counterbalance spring means

1984-11-02

1986-07-22

Kannan, Philip C.

Movable or removable closures

Up-and-over type; e.g., moves from vertical to withdrawn...

On lever or link

160191, E05D 1540

Patent

active

046011315

ABSTRACT:
A spring assembly for use in place of the spiral tension springs in conventional spring-loaded counterbalancing systems for garage doors. It is made up of a compression spring and traveling pulley in a tubular housing, the compression spring being mounted above the pulley. A cable extends around the pulley from an anchored end to interconnection with the kicker assembly of the mounting hardware for tension springs in an ordinary garage door counterbalancing system so that closing of the door causes the cable to pull up on the pulley and compress the spring. There is virtually no possibility that the compressed spring will rupture and emit flying fragments, but even if this occurred the housing would prevent the escape of such fragments to the surroundings.

REFERENCES:
patent: 2023909 (1935-10-01), Wread
patent: 2195875 (1940-04-01), Pixley
patent: 3402922 (1968-09-01), McCan
patent: 3429072 (1969-02-01), Sammons
patent: 3680259 (1972-08-01), Andresen
patent: 4082133 (1978-04-01), Halopoff
patent: 4235047 (1980-11-01), Turner

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