Siemens Aktiengesellschaft

Klaus-Dieter Voigt

Adolf Lindner

Richard Werner

A shut-off unit is disclosed. The shut-off unit is to be used to shut off a drive unit which drives a tubular shaft, the latter shaft being employed, in turn, to wind an awning or a roller blind up and down. More particularly, the drive unit includes an electric motor and a step down gear drive axially aligned therewith and the shut-off unit is adapted to be arrangeable in the drive unit so that the step down gear lies between it and the motor. Additionally, the shut-off unit includes switches for stopping the drive and members for operating such switches which have presettable positions dependent upon presettable positions of a driven part of the electric motor. In accordance with the invention, the aforesaid members are in the form of cams which have lobes and which are adapted to rotate as a function of the movement of the element to be wound and to be drivingly connectable to the central output shaft of the step down gear. With such an arrangement for the drive unit it can have shorter mounting dimensions and can be driven directly by the centrally disposed step down gear.

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Nurnberg, Germany

Klaus-Dieter Voigt