E - Fixed Constructions – 06 – B
Patent
E - Fixed Constructions
06
B
E06B 9/30 (2006.01) E06B 9/32 (2006.01)
Patent
CA 2332702
A lifting mechanism (30) includes a bracket (34) to hold the lifting mechanism (30). Two rollers (31) are respectively rotatably mounted in the bracket (34). A balance wheel set (32) is mounted in the bracket (34) and includes a first wheel (321) rotatably mounted between the two rollers (31) and simultaneously rotated with the two rollers (31), and a second wheel (322) rotatably mounted in the bracket (34) near the first wheel (321). A constant force motor spring (33) is mounted and wound between the first wheel (321) and the second wheel (322). Due to the constant force motor spring (33), a cord to raise or lower the slats is unnecessary and the cordless venetian blind can be opened or closed easily.
Bull Housser & Tupper Llp
Jumbo Surplus Corporation
LandOfFree
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