Door counterweight system

Details Door counterweight system Door counterweight system

E - Fixed Constructions

05

F

268/35, 160/5, 1

E05F 1/02 (2006.01) E05D 13/00 (2006.01) E05F 11/00 (2006.01) E06B 3/44 (2006.01)

Patent

CA 2006373

An overhead door system employs counterweights which operate through cables connected to a drum which tapers from one end to the other so that the effective force acting on the door in the opening direction is reduced as the proportion of the weight of the door to be supported reduces. The system is adjustable readily to accommodate different types of doors having different opening characteristics in terms of the proportion of the doors weight that must be counterbalanced at different stages of the door opening movement.

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