Fire rated floor door and control system

A control system for automatically closing a door in a fire wherein the door comprises a frame, a door hingedly mounted to the frame, a hydraulic/pneumatic housing pivotally mounted to the frame and having an axially moveable piston and connected rod in the housing forming a pneumatic chamber and a hydraulic chamber with the rod extending from the frame and the extending end of the rod being pivotally connected to the door, a hydraulic fluid source, a pneumatic valve having a first actuating means and a vent to the atmosphere, a hydraulic valve having a second actuating means, a second hydraulic valve, a heat sensing or heat activating means, a pressurized source activating means, and a pressurized pneumatic source comprising activating the heat sensing means by the fire which opens the second hydraulic valve and actuates the pressurized actuating means supplying a pressurized gas from the pressurized pneumatic source to the pneumatic valve, which pressurized gas actuates the first actuating means of the pneumatic valve to position the valve to close the vent and direct the gas to the pneumatic chamber of the housing closing the door wherein the oil in the hydraulic chamber of the housing is directed to the oil source through the second hydraulic valve and when the door is closed the first actuating means of the pneumatic valve is actuated to position the pneumatic valve to open the vent.

A control system for providing automatic movement of a structure comprising:

• a structure frame, a movable member attached to the frame, a hydraulic/pneumatic housing pivotally mounted to the frame or movable member and having an axially movable piston and connected rod in the housing forming a pneumatic chamber and a hydraulic chamber with the rod extending from the frame and the extending end of the rod being pivotally connected to the other member, e.g., movable member or frame, a hydraulic fluid source, a pneumatic valve having a first actuating means and a vent to the atmosphere, a hydraulic valve having a second actuating means, a second hydraulic valve, a heat sensing or heat activating means, a pressurized source activating means, and a pressurized pneumatic source comprising activating the heat sensing means by the fire which opens the second hydraulic valve and actuates the pressurized actuating means supplying a pressurized gas from the pressurized pneumatic source to the pneumatic valve, which pressurized gas actuates the first actuating means of the pneumatic valve to position the valve to close the vent and direct the gas to the pneumatic chamber of the housing closing the movable member wherein the oil in the hydraulic chamber of the housing is directed to the oil source through the second hydraulic valve and when the movable member is closed the first actuating means of the pneumatic valve is actuated to position the pneumatic valve to open the vent.