Patent ID: 6203421
Filing Date: 2001-03-20
Classification: F24F

Abstract:
A room ceiling vent for emplacement in a hole in a ceiling with a bottom surface comprising:a duct pipe;a stationary tube within the duct pipe;a metal bar attached to the duct pipe and to the stationary tube;a movable tube with a curved surface, concentric with the stationary tube and partly enclosing the stationary tube, an upper part of the movable tube being a plurality of stepped notches with a lowermost notch and higher notches that ascend along the curved surface of the movable tube;a metal sleeve integrally attached to the stationary tube;a plastic fuse pin inserted into the metal sleeve and extending beyond the metal sleeve, the plastic fuse pin made of a material that becomes soft when temperature of air entering the duct pipe indicates fire in the room;a spring with a first top attachment means and a bottom attachment means, the first top attachment means engaging the metal sleeve;a retaining plug with a ledge, a second top attachment means, and a bottom handling means, the movable tube attached to the retaining plug, the top attachment means of the retaining plug engaging the bottom attachment means of the spring;a damper plate in contact with the ledge of the retaining plug and with the movable tube but not fixed to the retaining plug nor to the movable tube.