Patent ID: 6425211
Filing Date: 2002-07-30
Classification: E05F,E05Y,Y10T

Abstract:
A self-closing fire rated floor door assembly comprising:(a) a fire rated frame with an opening therethrough; (b) a fire rated door hingedly connected to the frame and cooperating with the opening; (c) a cylinder with a fluid opening, the cylinder being pivotally connected to the frame and the door, the cylinder when pressurized with a fluid through the fluid opening maintaining the door in an open position relative to the frame, and when the fluid escapes from the fluid opening, enabling the door to close relative to the frame; (d) a fusible plug, rated according to a specific temperature, connected in fluid-tight manner with the fluid opening, the fusible plug when subjected to the specific temperature melting and enabling the fluid to escape from the fluid opening in the cylinder and the door to close.