Apparatus for counterbalancing an overhead door

Details Apparatus for counterbalancing an overhead door Apparatus for counterbalancing an overhead door

1989-04-14

1990-06-05

Godici, Nicholas P.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Sash balances

Spring

16197, 160191, 242107, 2421075, E05F 108

Patent

active

049301829

ABSTRACT:
An apparatus for counterbalancing an overhead door includes a spring anchor assembly adapted to be connected between one end of a torsion spring and a wall of a building at an overhead door opening and a spring winding assembly adapted to be connected between the opposite end of a torsion spring and a shaft rotatably mounted on the wall and coaxial with the spring. The shaft carries a pair of winding drums attached by cables to the bottom of an overhead door. Both the spring anchor assembly and the spring winding assembly have spring attachment means which are adjustable to accommodate different diameters of torsion springs and compensate for the helical form of the spring.

REFERENCES:
patent: 2630597 (1953-03-01), Robinson
patent: 3038535 (1962-06-01), Stroup et al.
patent: 3412423 (1968-11-01), Binns
patent: 3615065 (1971-10-01), Elliott
patent: 3635277 (1972-01-01), Bahnsen
patent: 3921761 (1975-11-01), Votroubek et al.
patent: 4731905 (1988-03-01), Milano et al.
patent: 4817927 (1989-04-01), Martin
Apco Power-Unit Corporation, Hi-Lift Cable Drum, 1982, U.S.A.

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