Chimney brush
Patent 4807320 Issued on February 28, 1989. Estimated Expiration Date: 
October 16, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 16, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1070662 Flue cleaning device Chimney cleaning apparatus Chimney cleaning apparatus Patent #: 4538317 InventorApplicationNo. 07/109206 filed on 10/16/1987US Classes:15/249.1Brush or broom-type flue cleanerExaminersPrimary: Feldman, PeterAttorney, Agent or FirmInternational ClassesF23J 3/00 (20060101)F23J 3/02 (20060101) AbstractA chimney brush is mounted between two pulleys within the chimney for reciprocation along the length of the chimney for cleaning deposits from the chimney flue liner. A first pulley is mounted by a bracket on the chimney cap. A second pulley is mounted below the stove connection or thimbol, adjacent an access door to the second pulley. A crank arm is provided for rotation of this lower pulley so that a brush attached to a looped cable between the upper and lower pulleys may be reciprocated along the length of the chimney. A spring connection is provided between the cable and the brush to compensate for any stretching or expansion of the cable due to heating. One of the pulleys has a V groove to ensure frictional driving engagement with the cable. When not in use, the brush is disposed beneath the stove connection or thimbol of the chimney, thus only the cable remains in the chimney, minimizing interference with the smoke flow within the chimney. | |
