Operating unit for architectural coverings

Details Operating unit for architectural coverings Operating unit for architectural coverings

E - Fixed Constructions

06

B

E06B 9/88 (2006.01)

Patent

CA 2710790

The invention relates to an operating unit (1) for architectural coverings, in particular roller blinds or shades. The unit (1) includes a stationary base member (37), a rotatable driving member (39), a rotatable driven member (29) and a brake mechanism (71, 73, and 75). The brake mechanism (71, 73, and 75) automatically arrests rotation of the driven member (29) in respect of the stationary base member (37), when not rotated by the driving member (39). The brake mechanism includes a first wrap spring (73), adapted to yield a predetermined minimum brake force, and at least one second wrap spring (75), different in size from the first wrap spring (73) and adapted to yield a supplementary brake force, which together with the predetermined minimum brake force amounts to a predetermined maximum brake force.

L'invention porte sur une unité d'actionnement (1) pour revêtements architecturaux, en particulier des stores à rouleau ou des volets. L'unité (1) comprend un élément de base fixe (37), un élément d'entraînement rotatif (39), un élément entraîné rotatif (29) et un mécanisme de frein (71, 73 et 75). Le mécanisme de frein (71, 73 et 75) arrête automatiquement la rotation de l'élément entraîné (29) par rapport à l'élément de base fixe (37), lorsque l'élément d'entraînement (39) ne le fait pas tourner. Le mécanisme de frein comprend un premier ressort enroulé (73), apte à produire une force de freinage minimale prédéterminée, et au moins un deuxième ressort enroulé (75), de taille différente de celle du premier ressort enroulé (73) et apte à produire une force de freinage supplémentaire, qui, conjointement avec la force de freinage minimale prédéterminée, produit une force de freinage maximale prédéterminée.

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