Abstract

A door communication device for use with a door. The door communication device includes a rotatable message wheel for selectively displaying a selected one of a plurality of messages and a rotatable shaft that provides an optical viewing pathway through the door. The shaft is formed from an intumescent material that expands to block the bore of the shaft when sufficiently heated, such as by a fire, to inhibit the passage of heated air and smoke through the door.

IPC Classes  ?

• E06B 7/30 - Peep-holesDevices for speaking throughDoors having windows
• E06B 5/16 - Fireproof doors or similar closuresAdaptations of fixed constructions therefor
• G09F 11/06 - Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the display elements being secured to rotating members, e.g. drums, spindles the elements being stiff plates or cards
• G09F 23/00 - Advertising on or in specific articles, e.g. ashtrays, letter-boxes