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Fire-resistant door
| Details |
Inventors: Tlemcani, Jalil; Carroll, Michael J.; Johnson, Patrick K.;
Assignee: Nystrom, Inc. (Minneapolis, MN)
Primary Examiner: Slack; Naoko
Assistant Examiner:
Attorney, Agent or Firm: Patterson, Thuente, Skaar & Christensen, P.A.
A fire-resistant, aluminum, cementitious-material-free, insulation-free door adapted to prevent the spread of fire and heat passing therethrough, consists of: a door frame, a door hingedly mounted on the door frame, the door having a bottom wall, a top wall, and side walls, the bottom wall, top wall and side walls enclosing a hollow central core not containing substantial amounts of insulating material, the bottom wall having an outside surface, and the top wall having an outside surface; and a layer of intumescent material on the outside surface of the bottom wall. A heat-activated self-closing mechanism allows the weight of the door to close the door in the vent of fire, by releasing gas from a supporting gas spring. |
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DETAILED DESCRIPTION A fire-resistant, aluminum, cementitious-material-free, insulation-free door adapted to prevent the spread of fire and heat passing therethrough, consists of: a door frame; a door hingedly mounted on the door frame, the door having a bottom wall, a top wall, and side walls, the bottom wall, top wall and side walls enclosing a hollow central core not containing substantial amounts of insulating material, the bottom wall having an outside surface, and the top wall having an outside surface; and a layer of intumescent material on the outside surface of the bottom wall.
A principle object and advantage of the present invention is that it does not require any cementitious material on the door to provide heat insulation.
Another principle object and advantage of the present invention is that it does not require substantial amounts of insulation material in the interior of the door.
Another principle object and advantage of the present invention is that much of the door hardware, including a lock, may be mounted in the hollow core of the door.
This allows the door to be mounted without reducing the clear opening size.
Another principle object and advantage of the present invention is the unique intumescent material used, which provides sufficient insulation, when activated by fire, that cementitious material and additional insulation are not needed.
Another principle object and advantage of the present invention is that the intumescent material shields the door sufficiently that the door may be constructed of aluminum.
Another principle object and advantage of the present invention is that the door passes ASTM E119 for a minimum of two hours.
Another principle object and advantage of the present invention is the novel self-closing mechanism disclosed herein.
The self-closing mechanism simply allows the weight of the door to close the door by deflating a gas spring holding the door open, which is a much simpler design than earlier self-closing mechanisms which used a heavy-duty hydraulic system to pull the door shut against the force of compression springs holding the door open
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