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US 4,047,554 AGranted
Drive mechanism and application to a blind with vertical slats
AssigneeCarpano & Pons
InventorJean Bullat
Life of this patent
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AssigneeCarpano & Pons
InventorJean Bullat
Estimating the term…
A drive mechanism, for example of a blind with vertical slats, comprises first and second rotatable driving elements kinematically connected to a common rotary actuating element respectively by a first coupling arranged to immediately couple the first driving element for a limited rotation with the actuating element when the latter is rotated and a second coupling arranged to couple the second driving element for rotation with the actuating element after a given rotation of the latter. Each coupling comprises, on the first driving element and a facing fixed surface for the first coupling, and on the second driving element and the actuating element for the second coupling, a helix or spiral ramp and a facing transverse groove housing a ball which allows a limited relative rotation of the respective parts.
A drive mechanism comprising first and second rotatable driving elements kinematically connected to a common rotary actuating element respectively by a first coupling arranged to immediately couple the first driving element for a limited rotation with the actuating element when the latter is rotated and a second coupling arranged to couple the second driving element for rotation with the actuating element after a given rotation of the latter, wherein each of said couplings comprises a ramp and a facing groove transverse to the ramp, each ramp and facing groove housing a mobile piece, the ramp and groove of the first coupling being provided on the first driving element and a facing fixed surface, and the ramp and groove of the second coupling element being provided on the second driving element and the actuating element.
Dependencies are inferred from the claim text.