The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 1984
Filed:
Sep. 13, 1982
Warren R Hedrick, Holland, MI (US);
Interpace Corporation, Parsippany, NJ (US);
Abstract
A thermally operated vent damper wherein a flue pipe (12) mounts an eliptical damper plate (38) for rotation about a hollow rod (30). A slot (42) is formed in the damper plate (38) by bending a flange (44) perpendicular to the plane of the damper plate (38) and providing an opening for a coil (52) of bimetallic material. The coil (52) controls the movement of the damper plate between closed and opened positions responsive to temperature in the flue pipe (12). An opening (19) in the flue pipe adjacent to the coil (52) provides a means for maintaining the coil (52) temperature lower than the flue gas temperature and for controlling the opening of the damper plate in the flue pipe in inverse proportion to the draft therein. A second bimetallic coil (60) is mounted outside the flue pipe to relieve stresses on the first bimetallic coil during prolonged high temperature excursions within the flue pipe.