Patents Assigned to Leonard Joseph Fisher
  • Fire damper
    Patent number: 4100931
    Abstract: A fire damper of the kind in which at least one flap is pivoted in a duct between a first position in which the flap closes the duct and a second position in which the duct is open. A suitably powered winching motor is adapted to control the movement of the flap through a linkage including a fusible link so that when the motor is energized the flap is moved to its second position or open position provided that the fusible link is still intact whereas when the motor is de-energized the flap is moved to its first or closed position.
    Type: Grant
    Filed: July 12, 1976
    Date of Patent: July 18, 1978
    Assignee: Leonard Joseph Fisher
    Inventors: Frederick William Pantland, Ernest Francis Pantland