Improvements in control units

Details Improvements in control units Improvements in control units

E - Fixed Constructions

06

B

E06B 9/68 (2006.01)

Patent

CA 2474212

A control unit for use in a window blind head rail assembly comprises a sprocket wheel, a chain guard housing, a sprocket support, a wrap spring including wrap spring juts, wherein the wrap spring juts have one or more flattened surfaces, and wherein the body of the wrap spring is of circular cross-section, a splined bush for engagement with the roller blind tube and a centre pin.

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