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:
Feb. 19, 1980
Filed:
Jan. 08, 1979
Applicant:
Inventors:
Dale E Maxson, Rockford, IL (US);
David E Ober, Warren, NJ (US);
Assignee:
Barber-Colman Company, Rockford, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
236 13 ; 236 49 ;
Abstract
Upon sensing an excessive temperature in a plenum supplying secondary air to a mixing box, a thermostatic element opens a valve to exhaust air from a pneumatic actuator for opening a normally closed secondary air damper. This action permits the damper to close and so prevent flow of secondary air from the plenum into the mixing box. The control may be tested by applying auxiliary heat to the thermostatic element. The control may be made to prevent spread of smoke by making the application of heat to the thermostatic element responsive to a smoke detector.