Shut-off device for a driven shaft

Abstract

A device for shutting off the rotary movement of a shaft driven by an electric motor via a reducing gear, after an adjustably predetermined number of revolutions, particularly a shaft for activating a window covering such as a blind with individual slats, with several ring-shaped switching disks arranged next to one another in their axial direction, each having a notch on its outside, which disks can be rotated about their common axis when the shaft is driven, with a rocker switch pressed against the switching disks by a spring and resting against the outside of the disks, which rocker shuts off the drive of the shaft when it simultaneously drops into the notches of all the switching disks, and on the inside of which disks inside gear teeth are provided, with the number of teeth being different from the number of teeth of the other switching disks in each instance, where the switching disks can be driven on their inside gear teeth by means of a gear wheel driven by the shaft, where the gear wheel is arranged coaxially on the shaft, so as not to rotate on it, and is directly engaged with the inside gear teeth of the switching disks during operation, where the outside diameter of the gear wheel is smaller than the inside diameter of the switching disks by at least twice the gear tooth height, and where the switching disks are arranged so that they can be shifted radially relative to the gear wheel.

Dependencies are inferred from the claim text.