Release brake for roller shades and other window coverings

Details Release brake for roller shades and other window coverings Release brake for roller shades and other window coverings

E - Fixed Constructions

06

B

E06B 9/42 (2006.01) E06B 9/262 (2006.01) E06B 9/322 (2006.01)

Patent

CA 2310074

A release brake (1) for a window covering (4, 28) of the type having a roller (2) about which either a window covering material or lift cords (10, 12) are wound as a stationary member (20), a movable member in the shape of a drum (15), and a hub (17). In one embodiment particularly useful for a roller shade, the hub (17) is fixed and the surrounding movable member (15) can be restrained or released by a coil spring (23) encircling the hub (17). In another embodiment the member which surrounds the hub (17) is fixed and the hub (17) can be restrained or released by a coil spring (23) encircling the hub. The spring (23) is sized and positioned so that the spring (23) will press against the outside surface of the hub ( 17) when in a relaxed condition to restain the hub (17) or sized and positioned to press against the inside surface of the movable member when in a related condition to restain that member. The tangs (25, 27) of the spring (23) are moved relative to one another to increase the diameter of the spring (23) which releases the hub (17) and allows it to rotate freely or to decrease the diameter of the spring (23) which releases the movable member (15) and allows it to rotate freely.

Un frein à déblocage (1) destiné à un couvre-fenêtre (4, 28) du type présentant un rouleau (2), autour duquel sont enroulés soit un matériau couvre-fenêtre soit des cordons (10, 12) de relevage, comprend un élément fixe (20), un élément mobile se présentant sous la forme d'un tambour (15), et un moyeu (17). Dans un mode de réalisation particulièrement utile pour un store, le moyeu (17) est fixe et l'élément mobile entourant (15) peut être retenu ou libéré par un ressort à boudin (23) entourant le moyeu (17). Dans un autre mode de réalisation, l'élément entourant le moyeu (17) est fixe et le moyeu (17) peut être retenu ou libéré par un ressort à boudin (23) entourant le moyeu. Le ressort (23) est dimensionné et positionné de manière qu'il (23) exerce une pression contre la surface extérieure du moyeu (17) lorsqu'il se trouve en position de repos afin de retenir ledit moyeu (17), ou il est dimensionné et positionner pour exercer une pression contre la surface intérieure de l'élément mobile lorsqu'il est en position de repos afin de retenir cet élément. Les queues (25, 27) du ressort (23) sont déplacées l'une par rapport à l'autre afin d'augmenter le diamètre du ressort (23) libérant le moyeu (17) et lui permettant de tourner librement ou de réduire le diamètre du ressort (23) libérant l'élément mobile (15) et lui permettant de tourner librement.

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