Abstract: The activation device has a cord pull (8) on which at a certain distance two catches (9) are firmly attached. Via a gear system (10) the cord pull (8) is connected to a shaft (23) which passes through sliding elements (24) and which is connected to gears arranged in the sliding elements with curtain strips (34). The curtain strips (34) can be pivoted about 180.degree. with the shaft (23). If the curtain strips (34) are against a stop, the latter can be moved in one of the longitudinal directions of the curtain rail, in which case one of the stops (9) is engaged with the front running sliding element (24a). By activation of the cord pull (8) thus the curtain strips (34) can be pivoted about their longitudinal axes or moved in the longitudinal direction of the curtain rail horizontally.

Abstract: The louver curtain has a plurality of sliding elements (3) displaceably guided in a curtain rail (1). For displacing and swivelling the curtain louvers (4), the sliding elements each have a worm drive with a toothed gear (31). The toothed gears (31) mate with a sprocket chain (2) guided in the curtain rail (1). Preferably, the sprocket chain is a bridged-string chain, in which the bridges (24) have teeth (21) arranged on a broadside and projecting laterally, said teeth mating with the toothed gears (31). The bridges (21) are injected by injection molding onto flexible stranded steel cords (23). The louver curtain is motorizable and characterized by noiseless function combined with little friction.

Abstract: An apparatus which facilitates the raising and lowering of a pull-up band for a blind. An axially rotatable winding shaft is disposed generally parallel to the section rail by which the apparatus is attached to a wall. At least one winding roller is disposed along the winding shaft, having an axis of rotation extending generally horizontally and perpendicular to the winding shaft, and is adapted to extend and retract a pull-up band wound onto the winding roller responsive to a drive mechanism which transfers motion from the winding shaft to the winding roller. The winding roller is rotatably mounted in a holder, and the drive mechanism is housed in a housing which is detachably fastened to the section rail.

Abstract: A tensioning device for use with an endless traverse which is longitudinally adjustable in both directions responsive to a rotational drive. The rotational drive includes two driving gears which are each selectively coupled with a drive shaft so that when one of the driving gears is positively driven, the other driving gear is permitted to rotate freely. The traverse changes from one driving gear to the other by passing from between a pair of overlying side walls and over a flange. Elongation resulting from strain of the traverse is continuously led out of the system so that blocking or braking of the traverse is avoided. The tensioning device is especially suitable for the operation of strip curtains or conventional curtains, as well as for curtain systems with large and heavy traverses.

Abstract: The strip curtain has a plurality of glide elements which are guided by a curtain rod and connected with each other by separation-limiting devices. The free hanging curtain strips are suspended from vertical pivot axes with limited excursion. Operation of the pivot axis is by a pinion which engages a bead chain that is slidably guided by the curtain rod. The pinion is connected to the pivot axis by a worm drive, a slip coupling being provided between the pinion and the worm drive. The bead chain serves as common drive for producing pivotal movement and sliding movement of the curtain strips. The strip curtain is of simple construction and therefore reliable in operation and inexpensive and suitable for mass production.

Abstract: A non-stretchable actuating tape moves in the curtain track, engaged by a sprocket wheel attached to the pivot shaft of each sliding element supporting a curtain strip. A slip coupling and stop member limits pivoting. A beaded chain limits spacing of sliding elements.