Patent ID: 6250326
Filing Date: 2001-06-26
Classification: A62C,F16K,F24F,Y10T

Abstract:
A mechanism for controlling the flow through a duct, comprising:a damper that allows air to pass when open and blocks air, flames, and hot gasses when closed;a motor that provides power to open or close said damper;a primary link that connects said motor to said damper below a predetermined temperature and disconnects said motor from said damper above said predetermined temperature;a secondary link that separates at a predetermined higher temperature, said secondary link with one end connected to one of said motor and said damper and a connectable end connectable to the other said motor and said damper to reconnect said motor and said damper after said primary link separates them, and to thereafter disconnect them at said higher temperature; anda guide connected between said motor and said damper that directs said secondary link to reconnect said motor and said damper after said primary link separates.