| 摘要 |
<p>The present invention provides a new and useful safety arrangement for use in a pivotable chimney damper including a damper flap to selectively open and close the outlet from the flue of a chimney. The damper flap is advantageously pivoted to and includes bias means to urge the damper flap to a normally open position with respect to the frame when unrestrained and carried closure means, which can include flexible pull means 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 where the pull means can be secured to hold the damper in closed position. An expansible spring means is 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 a flexible connector is joined to the pull means at a location below the spring means and the damper flap at a second location where pulling the 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.</p> |
