Endless belt power transmission systems or components – Positive drive pulley or guide roll – With particular belt
Patent
1990-06-25
1991-04-09
Bui, Thuy M.
Endless belt power transmission systems or components
Positive drive pulley or guide roll
With particular belt
160188, 474203, F16G 1500
Patent
active
050060970
ABSTRACT:
A control unit for single and double track blinds is provided and consists of a sprocket wheel having a hub rotatably carried in the center of a passageway within a housing. An operating handle extends into the hub that extends through a central aperture in a front cover plate on the housing. The operating handle can be turned to rotate the sprocket wheel, thus driving a bead chain through the passageway to operate louvers in the single and double track blinds.
REFERENCES:
patent: 2935881 (1960-05-01), Cayton
patent: 3187596 (1965-06-01), Doerr
patent: 4424852 (1984-01-01), Hopper
Bui Thuy M.
Kroll Michael I.
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