초록 ▼

A method and device according to which it becomes possible to operate a window shade automatically. Thus, by way of this method and device a window shade can be automatically closed during the night and automatically opened during the day. In this way it is possible to give to an unoccupied home an

A method and device according to which it becomes possible to operate a window shade automatically. Thus, by way of this method and device a window shade can be automatically closed during the night and automatically opened during the day. In this way it is possible to give to an unoccupied home an outside appearance tending to indicate that the occupants are at home.

대표청구항 ▼

A device for automatically controlling a window shade comprising: a lever arm pivotally mounted for movement between a first and second position; first solenoid means coupled to said lever arm for pivotting said lever arm to said first position in response to electrical activation by electrical timi

A device for automatically controlling a window shade comprising: a lever arm pivotally mounted for movement between a first and second position; first solenoid means coupled to said lever arm for pivotting said lever arm to said first position in response to electrical activation by electrical timing means; second solenoid means coupled to said lever arm for pivotting said lever arm to said second position in response to electrical activation by electrical timing means; first switch means for deactivating said first solenoid means upon said lever arm pivotting to said first position; second switch means for deactivating said second solenoid means upon said lever arm pivotting to said second position; spring toggle means coupled to said lever arm for maintaining said lever arm in either of said first and second positions after deactivation of said first or second solenoid means respectively by said first or second switch means respectively; electrical timing means electrically coupled to said first and second solenoid means to sequentially activate and deactivate the latter according to a predetermined timing sequence; and a pair of elongated flexible members, each having one end connected to a respective end portion of said lever arm and another end adapted to be connected to one of a pair of strings of a Venetian blind, so that when said lever arm assumes said first position, one of the Venetian blind strings is pulled by one of the elongated flexible members and when said lever arm assumes the second position, the other of said Venetian blind strings are pulled by the other of the elongated flexible members.