Chimney damper

摘要

A chimney damper for round flues that includes a rigid peripheral frame surrounding an open window area, a cap moveable toward and away from the open window to selectively close and open the same and springs interconnecting the cap and frame resiliently urging the cap to an open position. The square, rectangular, or round frame includes a shirt adapted to form or connect to a cylindrical base which comprises a round open window and thus can be configured for use on a round flue. The springs are preferably torsion springs and are located within the cap assembly and the open window area defined by the peripheral frame. The cap is guided during its movement toward and away from the frame by the springs and during such movement the cap rotates a partial turn relative to the frame to which it is connected by the springs.

主权项

1. A flue damper comprising:
a frame comprising a cylindrical frame base having a top peripheral edge surrounding an open window area and a bottom peripheral edge with a flange sized and shaped for cooperative engagement with a top distal end of a flue; a rotatable plate in alignment with and connecting to said cylindrical frame base by a plurality of torsion springs for urging said plate away from said top peripheral edge of said cylindrical frame base, said plate is round with a diameter less than said peripheral edge of said cylindrical frame base where upon compression of said torsion springs lowers said plate within said cylindrical frame base and a cap cooperatively engages said peripheral edge of said cylindrical frame base; said cap for covering said open window area and said plate, said cap sized and shaped for cooperative engagement with said top peripheral edge of said cylindrical frame base; means attaching said plate to said cap and for pulling said plate and said cap downward for cooperative engagement with said top peripheral edge of said cylindrical frame base; retainer means for rotational attachment of a distal end of said torsion springs to said cylindrical base frame; means for limiting rotational movement of said torsion springs with respect to said means for attaching said torsion springs to said cylindrical base frame; each one of said torsion springs attaching to said cylindrical frame base extending upward to said plate, said torsion spring bent at a selected angle for extending from said peripheral edge of said plate and held in rotatable position by a first positioning means attached to a surface of said plate, said torsion spring extending across said surface of said plate and rotatably held in position by a second positioning means attached to said surface of said plate, said distal end of said torsion spring extending from said second positioning means at a selected angle biased against said surface of said plate defining a stop means whereby upward or downward motion of said plate in alignment with said cylindrical base frame results in bending and twisting of said torsion springs; and whereby pulling said means for attaching said cap to said plate simultaneously bends, twists, and compresses said torsion springs against resilient bias toward said top peripheral edge of said cylindrical frame base wherein said cap cooperatively and releasably engaging said top peripheral edge of said cylindrical frame base.