Chimney damper
US9091439B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 12, 2011 |
| Grant date | Jul 28, 2015 |
| Priority date | — |
| Expiry date | Mar 8, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23L13/00
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.