US 4,172,563 AGranted

Shut-off unit in a drive unit for awnings and roller blinds

AssigneeSiemens Aktiengesellschaft

InventorsRichard Werner, Adolf Lindner, Klaus-Dieter Voigt

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Abstract

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.

Claims17

Dependent claims

A shut-off unit for use in stopping a drive unit which drives a tubular shaft upon which an element is to be wound, the drive unit being of a type including an electric motor and a step down gear drive having a central shaft and being drivingly connected to said motor, said drive unit being adapted to be contained within the tubular shaft, the shut-off unit being adapted to be arrangeable such that the step down gear drive is disposed between the shut-off unit and the motor, the shut-off unit comprising:

switches for stopping said drive unit;
means adapted to actuate said switches in accordance with a pre-settable number of rotations of said central shaft of said step down gear drive, said pre-settable number being dependent upon pre-settable end positions of the element to be wound, said means including cams which have lobes and which are adapted to be drivingly connectable to said central shaft of said step down gear drive, whereby said cams are adapted to undergo rotation which is related to the rotation of said central shaft, and therefore, the end positions of said element to be wound;
and
means for coupling said cams to said central shaft of said step down gear drive comprising:
i. a drive disk mounted on a stationary shaft, means coupling said drive disk to said central shaft;
ii. means releasably pressing said cams against opposite sides of said drive disk to obtain a frictional drive therebetween;
and
iii. two adjusting pins mounted for radial movement with respect to said drive disk adapted to engage said cams to release them from engagement with said disk to permit adjusting said cams by rotation on said stationary shaft.

5 more elements

Dependencies are inferred from the claim text.