US20030033786A1 - Fire door assembly - Google Patents
Fire door assembly Download PDFInfo
- Publication number
- US20030033786A1 US20030033786A1 US09/931,828 US93182801A US2003033786A1 US 20030033786 A1 US20030033786 A1 US 20030033786A1 US 93182801 A US93182801 A US 93182801A US 2003033786 A1 US2003033786 A1 US 2003033786A1
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- Prior art keywords
- fire
- insulating material
- sheet
- resistant insulating
- vertical edge
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
Definitions
- the present invention relates generally to an entry door for a building and, more specifically, to a fire-resistant building door construction.
- Fire-resistant doors or fire doors as they are referred to in the industry are used in various locations throughout a commercial building. Fire doors may also be used in residential buildings in accordance with various local codes.
- One type of fire door uses a thick sheet of fire-resistant insulating material that completely fills the area between the outer skins of the door.
- the fire-resistant insulating material is a dense material that substantially increases the weight of the door.
- known types of fire-resistant insulating materials are relatively expensive.
- One completely filled solid core door is described in U.S. Pat. No. 4,695,494. Because this door uses the fire-resistant insulating material through its thickness the cost and weight are relatively high.
- the present invention provides an improved fire-resistant door that includes a plurality of spacers.
- the spacers have a first side and a second side.
- a first sheet of fire-resistant insulating material coupled to the first side.
- a second sheet of fire-resistant insulating material is coupled to the second side.
- a first outer skin is coupled to the first sheet opposite said plurality of spacers.
- a second outer skin is coupled to the second sheet opposite the plurality of spacers.
- a method for assembling a door comprises:
- One advantage of the invention is that by providing a void between the layers of fire-resistant insulating material, the door is lighter weight than previously known fire doors. Also, the doors are less costly because the fire-resistant insulating material does not extend through the thickness of the door.
- FIG. 1 is an elevational view of a door assembly according to the present invention.
- FIG. 2 is a cross-sectional view of a door assembly in a closed position according to the present invention.
- FIG. 3 is an exploded view of a door assembly according to the present invention.
- FIG. 4 is a partial cross-section of an alternative embodiment of the invention.
- a door 10 is illustrated having a frame 12 around its perimeter.
- Frame 12 comprises a horizontal header 14 and vertical jambs 16 that are used for mounting the door within the building.
- Horizontal header 14 and vertical jambs 16 may be formed of a variety of materials including wood, metal or a composite material.
- horizontal header 14 and vertical jambs 16 are formed from metal.
- a fire stop 15 may be coupled to header 14 .
- Door 10 has around its periphery a hinge edge or stile 18 , a latch edge or stile 20 spaced apart from the hinge stile. Edge is used in a broad sense herein and is meant to include both stiles and other types of door constructions that do not have stiles.
- the distance between hinge stile 18 and latch stile 20 inclusive defines the width of the door.
- a top rail 22 extends between hinge stile 18 and latch stile 20 .
- a bottom rail 24 is spaced apart from top rail 22 and extends between hinge stile 18 and latch stile 20 .
- the distance between top rail 22 and bottom rail 24 inclusive defines the height of the door.
- hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 are formed of steel.
- Hinge stile 18 is used to mount door 10 rotatably within frame 12 .
- Latch stile 20 is used to mount a latch for holding a door in a closed position. Of course, those skilled in the art will recognize other materials may be used.
- Outer skins 26 A and 26 B are mounted to hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 .
- One suitable material for outer skins is 18 gauge steel. If outer skins 26 A and 26 B, hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 are formed of steel, MIG welding is a suitable method for fastening outer skin to the stiles and rails. Of course, other methods using fasteners or adhesives may be used.
- Outer skins 26 A, 26 B, and stiles 18 , 20 and rails 22 , 24 have a fire-resistant core 28 therebetween.
- Core 28 is formed of a plurality of spaced apart spacers 30 and a first sheet of fire-resistant insulating material 32 and a second sheet of fire-resistant insulating material 34 coupled to a respective first side and second side of the spacers 30 .
- the thickness T of core is preferably the same thickness as hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 . That is, spacers 30 are preferably less than the thickness of hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 .
- Spacers 30 may be formed of a number of materials including wood spacers, gypsum pads, concrete, corrugated cardboard, a honeycomb material, or as in the preferred embodiment, steel studs.
- Various cross-sectionally shaped steel studs may be used including rectangular, I-shaped, H-shaped, and irregular shapes. In one constructed embodiment the steel studs were 20 gauge, 1- ⁇ fraction (1/16) ⁇ inch by 1 inch.
- the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 are preferably formed of a gypsum-based product.
- a suitable material for fire-resistant insulating material includes Dens-Deck® roof board manufactured by Georgia-Pacific Gypsum Corporation. In one constructed embodiment, for example, one-quarter inch Dens-Deck® material was used for each sheet.
- the Dens-Deck® material has a fibrous mat 35 (only a portion of which is shown in FIG. 3) exterior with a conventional gypsum board interior.
- the fibrous mat may, for example, comprise glass fibers which strengthen the material for handling during the door assembly.
- the gypsum interior may be formed from calcined gypsum and water in a known manner.
- other suitable fire-resistant insulating materials may also be used such as fiberglass.
- the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 may be coupled to spacers 30 in various manners including the use of adhesives, fasteners or a combination thereof.
- outer skins 26 A and 26 B may also be fastened to the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 through the use of adhesives.
- the fire-resistant insulating material may be finishable to provide a desirable aesthetically pleasing appearance. Therefore, outer skins 26 A and 26 B may be eliminated in some commercial embodiments.
- a void 36 is preferably formed between spacers 30 and the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 .
- Void 36 is essentially an air space. By providing a void rather than completely filling the door space with a relatively heavy fire-resistant insulating material the door weight is reduced.
- a fill material 38 may be used to fill void 36 .
- Fill material 38 is preferably also fire-resistant insulating material and may comprise fiberglass insulation. Fiberglass insulation has the advantage of not being as dense as a gypsum-based material and therefore does not substantially increase the weight of the door.
- the following process is preferably used.
- the steps described here may be formed in various orders and therefore is not meant to be limiting.
- the steel studs were positioned at a maximum of twelve inches on center.
- the spacers 30 are preferably positioned vertically between and parallel with hinge stile 18 and latch stile 20 .
- the spacers 30 are also positioned between the top rail 22 and bottom rail 24 .
- the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 are coupled to the spacers 30 and preferably extend to hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 . Fasteners or adhesives or a combination thereof may be used. If a thicker door is desired, the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 may extend over hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 .
- the outer skins 26 A and 26 B are coupled to the first sheet of fire-resistant insulating material 32 and the second sheet of fire-resistant insulating material 34 , respectively. Outer skins 26 A and 26 B may also be coupled to hinge stile 18 , latch stile 20 , top rail 22 , and bottom rail 24 . Once outer skins 26 A and 26 B are coupled thereto, the door may be installed into a frame prior to shipping or may be installed in the frame once on a jobsite. Hinges and other door hardware (not shown) may be coupled to hinge stile 18 and a door latch to latch stile 20 .
Abstract
A door assembly includes a plurality of spacers. The spacers have a first side and a second side. A first sheet of fire-resistant insulating material is coupled to the first side. A second sheet of fire-resistant insulating material is coupled to the second side. A first outer skin is coupled to the first sheet opposite said plurality of spacers. A second outer skin is coupled to the second sheet opposite the plurality of spacers.
Description
- The present invention relates generally to an entry door for a building and, more specifically, to a fire-resistant building door construction.
- Fire-resistant doors or fire doors as they are referred to in the industry, are used in various locations throughout a commercial building. Fire doors may also be used in residential buildings in accordance with various local codes.
- One type of fire door uses a thick sheet of fire-resistant insulating material that completely fills the area between the outer skins of the door. The fire-resistant insulating material is a dense material that substantially increases the weight of the door. Also, known types of fire-resistant insulating materials are relatively expensive. One completely filled solid core door is described in U.S. Pat. No. 4,695,494. Because this door uses the fire-resistant insulating material through its thickness the cost and weight are relatively high.
- Another fire-resistant door is described in U.S. Pat. No. 4,811,538. This door comprises a single sheet of fire-resistant insulating material that is support between the door skins. Spacers are provided on either side of the fire-resistant insulating material to support the door skins. Upon the testing of a similar configuration, applicant concluded that such a door configuration does not provide adequate fire protection during testing.
- It would therefore be desirable to provide a fire-resistant door that is less expensive to manufacture than current doors as well as fire-resistant to predetermined codes.
- It would therefore be desirable to provide a fire resistant door assembly that reduces the cost of the installation of the door.
- The present invention provides an improved fire-resistant door that includes a plurality of spacers. The spacers have a first side and a second side. A first sheet of fire-resistant insulating material coupled to the first side. A second sheet of fire-resistant insulating material is coupled to the second side. A first outer skin is coupled to the first sheet opposite said plurality of spacers. A second outer skin is coupled to the second sheet opposite the plurality of spacers.
- A method for assembling a door comprises:
- coupling a plurality of spaced-apart spacers between a first sheet of fire-resistant insulating material and a second sheet of fire-resistant insulating material;
- coupling a first outer skin to the first sheet of fire-resistant material; and
- coupling a second outer skin to the second sheet of fire-resistant insulating material.
- One advantage of the invention is that by providing a void between the layers of fire-resistant insulating material, the door is lighter weight than previously known fire doors. Also, the doors are less costly because the fire-resistant insulating material does not extend through the thickness of the door.
- Other advantages and features of the present invention will become apparent when viewed in light of the detailed description of the preferred embodiment when taken in conjunction with the attached drawings and appended claims.
- FIG. 1 is an elevational view of a door assembly according to the present invention.
- FIG. 2 is a cross-sectional view of a door assembly in a closed position according to the present invention.
- FIG. 3 is an exploded view of a door assembly according to the present invention.
- FIG. 4 is a partial cross-section of an alternative embodiment of the invention.
- In the following figures, the same reference numerals will be used to illustrate the same components in the various views. The present invention is described and illustrated with respect to flat-skinned commercial doors. However, various types of shapes and style doors may be formed according to the present invention.
- Referring now to FIGS.1-3, a
door 10 is illustrated having aframe 12 around its perimeter.Frame 12 comprises ahorizontal header 14 andvertical jambs 16 that are used for mounting the door within the building.Horizontal header 14 andvertical jambs 16 may be formed of a variety of materials including wood, metal or a composite material. Preferably, in commercial door environments,horizontal header 14 andvertical jambs 16 are formed from metal. As is best shown in FIG. 2, afire stop 15 may be coupled toheader 14. -
Door 10 has around its periphery a hinge edge orstile 18, a latch edge orstile 20 spaced apart from the hinge stile. Edge is used in a broad sense herein and is meant to include both stiles and other types of door constructions that do not have stiles. The distance betweenhinge stile 18 andlatch stile 20 inclusive defines the width of the door. Atop rail 22 extends betweenhinge stile 18 andlatch stile 20. Abottom rail 24 is spaced apart fromtop rail 22 and extends betweenhinge stile 18 andlatch stile 20. The distance betweentop rail 22 andbottom rail 24 inclusive defines the height of the door. Preferably,hinge stile 18,latch stile 20,top rail 22, andbottom rail 24 are formed of steel. Hingestile 18 is used to mountdoor 10 rotatably withinframe 12.Latch stile 20 is used to mount a latch for holding a door in a closed position. Of course, those skilled in the art will recognize other materials may be used. -
Outer skins hinge stile 18,latch stile 20,top rail 22, andbottom rail 24. One suitable material for outer skins is 18 gauge steel. Ifouter skins hinge stile 18,latch stile 20,top rail 22, andbottom rail 24 are formed of steel, MIG welding is a suitable method for fastening outer skin to the stiles and rails. Of course, other methods using fasteners or adhesives may be used. -
Outer skins stiles rails resistant core 28 therebetween.Core 28 is formed of a plurality of spacedapart spacers 30 and a first sheet of fire-resistantinsulating material 32 and a second sheet of fire-resistantinsulating material 34 coupled to a respective first side and second side of thespacers 30. The thickness T of core is preferably the same thickness ashinge stile 18,latch stile 20,top rail 22, andbottom rail 24. That is,spacers 30 are preferably less than the thickness ofhinge stile 18,latch stile 20,top rail 22, andbottom rail 24. -
Spacers 30 may be formed of a number of materials including wood spacers, gypsum pads, concrete, corrugated cardboard, a honeycomb material, or as in the preferred embodiment, steel studs. Various cross-sectionally shaped steel studs may be used including rectangular, I-shaped, H-shaped, and irregular shapes. In one constructed embodiment the steel studs were 20 gauge, 1-{fraction (1/16)} inch by 1 inch. - The first sheet of fire-resistant insulating
material 32 and the second sheet of fire-resistant insulatingmaterial 34 are preferably formed of a gypsum-based product. Of course, other fire-resistant mineral based products may be used. One suitable material for fire-resistant insulating material includes Dens-Deck® roof board manufactured by Georgia-Pacific Gypsum Corporation. In one constructed embodiment, for example, one-quarter inch Dens-Deck® material was used for each sheet. The Dens-Deck® material has a fibrous mat 35 (only a portion of which is shown in FIG. 3) exterior with a conventional gypsum board interior. The fibrous mat may, for example, comprise glass fibers which strengthen the material for handling during the door assembly. The gypsum interior may be formed from calcined gypsum and water in a known manner. Of course, other suitable fire-resistant insulating materials may also be used such as fiberglass. - The first sheet of fire-resistant insulating
material 32 and the second sheet of fire-resistant insulatingmaterial 34 may be coupled tospacers 30 in various manners including the use of adhesives, fasteners or a combination thereof. Also,outer skins material 32 and the second sheet of fire-resistant insulatingmaterial 34 through the use of adhesives. It should be noted that the fire-resistant insulating material may be finishable to provide a desirable aesthetically pleasing appearance. Therefore,outer skins - A void36 is preferably formed between
spacers 30 and the first sheet of fire-resistant insulatingmaterial 32 and the second sheet of fire-resistant insulatingmaterial 34.Void 36 is essentially an air space. By providing a void rather than completely filling the door space with a relatively heavy fire-resistant insulating material the door weight is reduced. - Referring now to FIG. 4, a
fill material 38 may be used to fillvoid 36.Fill material 38 is preferably also fire-resistant insulating material and may comprise fiberglass insulation. Fiberglass insulation has the advantage of not being as dense as a gypsum-based material and therefore does not substantially increase the weight of the door. - To assemble a door, the following process is preferably used. The steps described here may be formed in various orders and therefore is not meant to be limiting. In one constructed embodiment the steel studs were positioned at a maximum of twelve inches on center. Thus, for a large commercial door about four
spacers 30 may be used as illustrated in FIG. 1. Thespacers 30 are preferably positioned vertically between and parallel withhinge stile 18 andlatch stile 20. Those skilled in the art will recognize that various orientations ofspacers 30 may be used depending on the type of spacer. Thespacers 30 are also positioned between thetop rail 22 andbottom rail 24. The first sheet of fire-resistant insulatingmaterial 32 and the second sheet of fire-resistant insulatingmaterial 34 are coupled to thespacers 30 and preferably extend to hingestile 18,latch stile 20,top rail 22, andbottom rail 24. Fasteners or adhesives or a combination thereof may be used. If a thicker door is desired, the first sheet of fire-resistant insulatingmaterial 32 and the second sheet of fire-resistant insulatingmaterial 34 may extend overhinge stile 18,latch stile 20,top rail 22, andbottom rail 24. - The
outer skins material 32 and the second sheet of fire-resistant insulatingmaterial 34, respectively.Outer skins stile 18,latch stile 20,top rail 22, andbottom rail 24. Onceouter skins stile 18 and a door latch to latchstile 20. - While particular embodiments of the invention have been shown and described, numerous variations and alternate embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention be limited only in terms of the appended claims.
Claims (24)
1. A door assembly comprising:
a spacer having a first side and a second side;
a first sheet of fire-resistant insulating material coupled to said first side;
a second sheet of fire-resistant insulating material coupled to said second side;
a first outer skin coupled adjacent to said first sheet opposite said spacer; and
a second outer skin coupled adjacent to said second sheet opposite spacer.
2. A door assembly as recited in claim 1 wherein said first fire-resistant insulating material and said second fire-resistant insulating material comprises a gypsum-based material.
3. A door assembly as recited in claim 1 wherein said gypsum based material has a fibrous mat therearound.
4. A door assembly as recited in claim 1 wherein said spacer is selected from the group of wood spacers, gypsum pads, concrete, corrugated cardboard, and a honeycomb material.
5. A door assembly as recited in claim 1 wherein said spacer is formed of a plurality of studs.
6. A door assembly as recited in claim 5 wherein said plurality of studs are composed of steel.
7. A door assembly as recited in claim 1 wherein spacer, said first outer skin and said second outer skin form a void therebetween.
8. A door assembly as recited in claim 7 wherein said void has fill material therein.
9. A door assembly comprising:
a first vertical edge;
a second vertical edge space apart from said first vertical edge;
a top rail coupled to said first vertical edge and said second vertical edge;
a bottom rail spaced apart from said top rail coupled to said first vertical edge and said second vertical edge;
a plurality of spaced-apart spacers disposed between said first vertical edge, said second vertical edge, said top rail and said bottom rail, said plurality of spaced-apart spacers having a first side and a second side;
a first sheet of fire-resistant insulating material coupled to said first side;
a second sheet of fire-resistant insulating material coupled to said second side;
a first outer skin coupled to said first sheet opposite said plurality of spacers; and
a second outer skin coupled to said second sheet opposite said plurality of spacers.
10. A door assembly as recited in claim 9 wherein said first sheet of fire-resistant insulating material is coupled to said first vertical edge, said second vertical edge, said top rail and said bottom rail.
11. A door assembly as recited in claim 9 wherein said first sheet of fire-resistant insulating material is coupled to said first vertical edge, said second vertical edge, said top rail and said bottom rail.
12. A door assembly as recited in claim 9 wherein said first fire-resistant insulating material and said second fire-resistant insulating material comprises a gypsum-based material.
13. A door assembly as recited in claim 9 wherein said gypsum based material has a fibrous mat therearound.
14. A door assembly s recited in claim 9 wherein said plurality of spaced-apart spacers are selected from the group of wood spacers, gypsum pads, concrete, corrugated cardboard, and a honeycomb material.
15. A door assembly as recited in claim 9 wherein said plurality of spaced-apart spacers are formed of studs.
16. A door assembly as recited in claim 15 wherein said plurality of studs are composed of steel.
17. A door assembly as recited in claim 9 wherein said plurality of spaced-apart spacers, said first outer skin and said second outer skin form a void therebetween.
18. A door assembly as recited in claim 16 wherein said void has fill material therein.
19. A door assembly as recited in claim 9 wherein said first sheet of fire-resistant insulating material, said second sheet of fire-resistant insulating material, and said plurality of spaced-apart spacers comprise a core having a predetermined thickness, said first vertical edge, said second vertical edge, said top rail and said bottom rail having said predetermined thickness.
20. A method of forming a door comprising:
coupling a plurality of spaced-apart spacers between a first sheet of fire-resistant insulating material and a second sheet of fire-resistant insulating material;
coupling a first outer skin to the first sheet of fire-resistant insulating material; and
coupling a second outer skin to the second sheet of fire-resistant insulating material.
21. A method as recited in claim 20 wherein coupling forms a void between said plurality of spaced-apart studs, said first sheet of fire-resistant insulating material and said second sheet of fire-resistant insulating material.
22. A method as recited in claim 20 further comprising filling said void with a fire-resistant insulating material.
23. A method as recited in claim 20 wherein coupling a plurality of spaced-apart spacers comprises coupling a plurality of spaced-apart studs between a first sheet of fire-resistant insulating material and a second sheet of fire-resistant insulating material.
24. A door assembly comprising:
a first vertical edge;
a second vertical edge space apart from said first vertical edge;
a top rail coupled to said first vertical edge and said second vertical edge;
a bottom rail spaced apart from said top rail coupled to said first vertical edge and said second vertical edge;
a plurality of spaced-apart spacers disposed between said first vertical edge, said second vertical edge, said top rail and said bottom rail, said plurality of spaced-apart spacers having a first side and a second side;
a first sheet of fire-resistant insulating material coupled to said first side; and
a second sheet of fire-resistant insulating material coupled to said second side.
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US09/931,828 US20030033786A1 (en) | 2001-08-17 | 2001-08-17 | Fire door assembly |
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US09/931,828 US20030033786A1 (en) | 2001-08-17 | 2001-08-17 | Fire door assembly |
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