Patents Assigned to The EFCO Manufacturing Company Pty. Ltd.
  • Door control apparatus
    Patent number: 4490624
    Abstract: A fail safe mechanism for power operated doors comprises an auxiliary power supply, an electric motor, a self operating clutch to connect the motor to the door's normal drive assembly and a relay/timer circuit to energize the motor in the event of a mains failure to enable the motor to drive the door open.
    Type: Grant
    Filed: May 31, 1983
    Date of Patent: December 25, 1984
    Assignee: The EFCO Manufacturing Company Pty. Ltd.
    Inventor: Graham J. Luker