Automatic damper device
AssigneeSave Fuel Corporation
InventorCharles E. Woolfolk
Life of this patent
Estimating the term…
Abstract
This invention relates to an automatic damper device for use in exhaust flues, such as flues of combustion devices such as furnaces and water heaters, devices such as air conditioners, and the like, to prevent undesirable loss of hot air or cold air out the flues during periods when no combustion is taking place. The damper has a rotatable damper plate held in normal open position which provides a desired fail safe in the open position assurance. The damper is also adapted to remain in the open position during periods of combustion in the furnace or water heater but otherwise be retained in the closed position to avoid the unnecessary loss of heated air or cooled air.
Claims3
In a device to control the discharge of the products of combustion from a furnace or like device which has a burner and means including a solenoid operated control valve to control the supplying of fuel to the burner, the furnace also including an outlet tube through which the products of combustion can escape, the improvement comprising a damper control device including a tube member adapted to be installed in and as part of the outlet tube of the furnace, a reinforced means on said tube member to provide support therefor, a shaft journaled to the reinforcing means and having a first portion extending across the tube member and a second portion extending outwardly from said tube member, a damper plate attached to the first shaft portion and extending therefrom to adjacent the reinforcing means when in the closed position, means forming a crank arm on the second shaft portion, spring means operatively engageable with the crank arm biasing said crank arm and the shaft in a direction to move the damper plate away from the reinforcing means to an open position, motor means operatively connected to the crank arm for moving the damper plate from an open position away from the reinforcing means when said motor means is energized, switch means having an actuating member operatively engageable with the crank arm, said switch means going from one position when the damper plate is in an open position to a different position when the damper plate is in a closed position, said spring means effecting movement of said damper plate to an open position whenever said motor means is de-energized, the furnace cycling being controlled by thermostatically controlled switch means and a relay having a relay coil and relay contacts, means connecting the relay coil in series with the thermostatically controlled switch means whereby the relay coil is energized whenever the thermostatically controlled switch means are closed, said relay contacts including first relay contact means in circuit with the motor means for energizing the motor means, and second relay contact means in circuit with the solenoid operated control valve means on the furnace to enable energizing of the valve means whenever the relay coil is energized.
Dependencies are inferred from the claim text.