Patent ID: 6505441
Filing Date: 2003-01-14
Classification: E04F,E05B,F23J

Abstract:
An access door to allow access to an interior of a duct having a rectangular opening formed therein comprising:(a) a first rectangular plate larger in length and width than said duct rectangular opening and having at least four threaded apertures adjacent the corners of said plate, said at least four threaded apertures defining a rectangular area which is smaller in length and width than the duct rectangular opening, said first plate further including at least two bolts fixed to and projecting outwardly from said first plate inside said area defined by said at least four threaded apertures (b) a second rectangular plate having the same length and width as said first plate and including at least two holes registering with said bolts fixed to said first plate and at least four holes registering with said threaded apertures adjacent the corners of said first plate; (c) a non-flammable gasket which can withstand temperatures resulting from burning debris located within said duct fixed to said second plate, said gasket positioned between said first and second plates and co-extensive with said plates; (d) nuts threaded onto said at least two bolts fixed to said first plate; and (e) bolts extending through said at least four holes in second plate and threaded into said at least four threaded apertures in said first plate; wherein (f) said nuts and said bolts can be tightened to draw said first and second plates together and to exert a compressive force upon said gasket.