Apparatus for raising and lowering blinds

Claim 1

APPARATUS FOR RAISING AND LOWERING A BLIND OF THE TYPE WHICH IS CONTROLLED FROM A ROTATABLE CYLINDER, COMPRISING A ROTATABLE WINDING ELEMENT MOUNTED REMOTELY FROM THE CYLINDER, AN ELECTRIC MOTOR CONNECTED TO OPERATE THE WINDING ELEMENT, A STRAP CONNECTED TO AND EXTENDING BETWEEN THE CYLINDER AND THE WINDING ELEMENT AND WHICH WHEN WOUND ON THE WINDING ELEMENT WILL CAUSE ROTATION OF THE CYLINDER WHEN THE ELECTRIC MOTOR IS OPERATED TO RAISE THE BLIND, THE MOTOR AND THE WINDING ELEMENT BEING DISPOSED BENEATH, THE BLIND CYLINDER, AN ELECTRICAL CONTROL CIRCUIT FOR THE MOTOR INCLUDING AT LEAST ONE MICROSWITCH, AND SENSING MEANS WHICH SENSES THE AMOUNT OF THE FLEXIBLE DRIVING ELEMENT WOUND ON THE WINDING ELEMENT, THE SENSING MEANS BEING OPERATIVELY ASSOCIATED WITH THE MOCROSWITCH TO ACTUATE THE LATTER, THEREBY STOPPING THE MOTOR, WHEN THE BLIND REACHES A PREDETERMINED POSITION.