Abstract: The invention relates to a process for producing ready-to-use slats from semifinished slat portions for a slatted Venetian blind having vertically directed slats. In connection with the process, the slat portions are in each case cut at their free lower end to the length corresponding to the installation height, plus an extra length that takes into account a wrap-over portion. The wrap-over portion of a slat is in each case folded over at a bending edge predetermined by the use length. The lower end part of a slat is provided, in the vicinity of the wrap-over portion, with a system of perforations consisting of at least two holes for receiving retaining pins of a retaining means. The retaining pins are passed through the holes and locked.

Abstract: A device for terminating the rotary movement of a driven shaft following an adjustable predetermined number of revolutions, with one or more switch disks arranged coaxially adjacent and provided with notches of their outer circumference, said disks being driveable by the shaft, with a plurality of switch disks with different rotational speeds, and with a switch arm resting on the outer circumference of the switch disk(s), said arm dropping into the notch and/or (in the case of a plurality of switch disks) notches, when the latter correspond in their angular position, thus shutting off the drive to the shaft.

Abstract: A slatted blind comprises vertically disposed slats each mounted at a top end thereof on pivot means carried for rotation about a vertical axis by a respective guide carriage movable along a support rail. At least one of the guide carriages carries a nut provided externally with a first gear ring, the nut being rotatably and axially immovably mounted on the carriage and being engaged on a rotatable threaded operating rod extending longitudinally of the support rail. The pivot means comprises a bush and a shaft retained in the bush, the slat being mounted on the shaft and a top end of the bush being provided externally with a second gear ring meshing with the first gear ring on the nut. Engaging clutch surfaces of the bush and shaft form a slip clutch operative on rotation of the operating rod to rotate the slat about its longitudinal axis to a limiting position and then to slip to cause displacement of the guide carriage along the support rail.