초록 ▼

For the purpose of giving the user of an electric control of a venetian blind in a window the possibility of adjusting the angular position of the slats independently of raising or lowering the venetian blind by utilizing an electric motor, spring clutches, and corresponding lift cords, the electric

For the purpose of giving the user of an electric control of a venetian blind in a window the possibility of adjusting the angular position of the slats independently of raising or lowering the venetian blind by utilizing an electric motor, spring clutches, and corresponding lift cords, the electric control includes a control circuit with a three position switch controlled by the user. The control circuit is arranged so as to drive the motor at a low speed during a first predetermined time interval for adjusting the angle of the slats and thereafter to drive the motor at an increased speed for raising or lowering the venetian blind.

대표청구항 ▼

In the combination of an electric control system for an electric Venetian blind and a Venetian blind having a head rail, a lower list, a plurality of slats, ladder tapes supporting the slats, lift cords connected to the lower list, and a drive mechanism including spring clutches for driving the ladd

In the combination of an electric control system for an electric Venetian blind and a Venetian blind having a head rail, a lower list, a plurality of slats, ladder tapes supporting the slats, lift cords connected to the lower list, and a drive mechanism including spring clutches for driving the ladder tapes, the spring clutches being associated with a drive shaft, and being movable upon rotation of the drive shaft over a limited arc and moveable relative to the drive shaft when the spring clutches reach the limit of the limited arc, and the lift cords being connected to the drive shaft for raising and lowering the lower list in response to rotation of the drive shaft, and a reversible electric motor for driving the drive shaft, the improvement comprising: a control circuit for supplying current to the motor, said control circuit including first means for supplying a first current to the motor for a predetermined time to drive the motor at a first speed in either direction, as chosen by a user, to slowly change the angle of the slats by movement of the spring clutches, and said control circuit further including second means for supplying a second current, greater than said first current, for driving the motor at a second speed, greater than said first speed, in the direction chosen by the user, to raise or lower the lower list by means of the lift cords connected to the drive shaft.