E - Fixed Constructions – 05 – D
Patent
E - Fixed Constructions
05
D
E05D 13/00 (2006.01) E05F 11/54 (2006.01) E06B 9/02 (2006.01) E06B 9/60 (2006.01)
Patent
CA 2136332
A counterbalancing mechanism (10) for a door (D) movable between a closed position proximate a door frame (12) and an open position displaced therefrom including a pair of drums (100, 100) for reeving lengths of cable (C) thereabout which are affixed to the door (D), shafts (70) for freely rotatably mounting the drums thereon, a pair of brackets (60, 60) mounted in spaced relation on the door frame, one of the brackets supporting each of the pair of shafts, a drive tube (30) extending between the pair of drums and being non-rotatably affixed thereto, a coil spring (80) positioned interiorly of the drive tube, said coil spring having one end (82) thereof non-rotatably affixed to the drive tube and the other end (81) non-rotatably affixed to the shaft, and a tension adjusting mechanism (110) for normally restraining the shafts and for effecting rotation of the shafts to selectively adjust the torsional forces in the coil spring.
Mullet Willis
Gowling Lafleur Henderson Llp
Overhead Door Corporation
Wayne-Dalton Corp.
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