E - Fixed Constructions – 06 – B
Patent
E - Fixed Constructions
06
B
160/1
E06B 9/08 (2006.01) E06B 9/34 (2006.01) E06B 9/36 (2006.01)
Patent
CA 1266821
ABSTRACT OF THE DISCLOSURE A windable curtain or blind in which individuals bands are wound or unwound on a winding tube. A winding mechanism including first and second driving screws acts to reduce input rotational motion resuiting from motion of a manual belt. When the belt is fully unwound the individual bands are rotated by means of a rack coupled to the second driven screw to control lighting and ventilation. The curtain of windable, rotatable blades comprising: driving means for receiving rotational motion; winding cylinder means rotatable about a longitudinal axis thereof; reducing means coupled to said winding cylinder means and said driving means for reducing said rotational motion and applying a reduced rotational motion of said winding cylinder, comprising first and second differential, screws, located coaxi- ally, coacting with first and second free nuts, respectively, said first screw being coupled to said driving means so as to transfer its rotation thereto, and said second screws being coupled to said winding means, said screw having helical thread channels of different pitch conforming with respective threads of said nuts, said nuts being interconnected at a distance by a nut carrier mounted for linear motion coaxial with said screws and in such a manner that when said first screw turns said second screw comes into rotation, said thread channel pitched of said screws being selected so that fast rotations of said first screw are reduced when said second screw is rotated.
451987
Marks & Clerk
Zveibil Salvador Matheus
LandOfFree
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