Ventilation – Chimney or stack – Chimneytop or stacktop structure
Patent
1989-02-27
1992-01-14
Dority, Carroll B.
Ventilation
Chimney or stack
Chimneytop or stacktop structure
126286, F23L 1100
Patent
active
050800060
ABSTRACT:
The present invention provides a new and useful arrangement for use in a pivotable chimney dampers of the type including a damper flap to selectively open and close the outlet from the flue of a chimney where the damper flap is pivoted and includes bias means to urge the damper flap to a normally open position with respect to a frame which surrounds the flue when the damper is unrestrained and where a flexible connection is provided to be attached at a first location to the damper flap to pull the damper flap to a closed position against the frame member when the pull means is drawn tight. An expansible spring means can be attached between the damper flap and the pull means to be pulled to extended position when the damper flap is closed. In accordance with the present invention the flexible connector is joined to the pull at a location below the spring and a bracket is provided to extend outwardly from the inside of the flue and has a guide to receive the flexible connector to direct the flexible pull so the damper flap at a second location pulling the flexible connector urges the damper toward open position where the length of the flexible connector is such that upon selected extension of spring means the flexible connector becomes taught and the force exerted on the second location is in excess of the force exerted on the first location so the damper flap is urged toward open position.
REFERENCES:
patent: 3945307 (1976-03-01), Lyemance
patent: 4165679 (1979-08-01), Lyemance
Dority Carroll B.
Steutermann Edward M.
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