E - Fixed Constructions – 06 – B
Patent
E - Fixed Constructions
06
B
E06B 9/62 (2006.01) E05D 15/14 (2006.01) E05F 15/16 (2006.01) E06B 9/68 (2006.01)
Patent
CA 2085692
A roll-up door for enclosing the doorway in a building. The door comprises a horizontal rotatable drum mounted above the doorway and a flexible door panel is wound on the drum. A pulley is secured to each end of the drum and the first ends of a pair of belts are secured to each pulley and the belts are wound in over- lapping relation on pulley so that adjacent convolutions of each belt are separated by convolutions of the other belt. The free end of one belt is dead-ended on the frame, and a counterbalancing weight is attached to the belt intermediate its ends and exerts a counterbalancing force to wind the door panel on the drum. The free end of the second belt is connected to the lower end of the door panel and a pair of springs are connected to the second belt intermediate its ends and the springs exert a tensioning force to stretch the door panel when the door panel is in the closed position.
Borden Ladner Gervais Llp
Kelley Company Inc.
LandOfFree
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