Patent ID: 8656683
Filing Date: 2014-02-25
Classification: A62C,E06B

Abstract:
1. A shutter including: an outer sheet of generally square or rectangular shape; a non-combustible insulating panel of generally the same shape as the outer sheet; and a frame, the panel being positioned between the outer sheet and the frame so that the outer sheet overlies a first broad face of the panel and the frame is attached adjacent to a second broad face of the panel which is opposite the first face, the outer sheet having edge regions and having a melting point of greater than or equal to about 840° C., the panel being operable to retard heat transmission from the first face thereof adjacent to the outer sheet to the second face opposite the first face, so that when the first face is exposed to a temperature of 730° C. for a period of 15 minutes, the temperature at the second face does not exceed 250° C., each of the outer sheet and the panel being secured to the frame, the frame including a lip, flange or channel within which the edge regions of the outer sheet are located and which allows the outer sheet to expand into the lip, flange or channel upon the temperature of the outer sheet increasing while maintaining the outer sheet overlying the first face of the panel, and the frame being substantially resistant to distortion up to a temperature of about 250° C.