Door device

Abstract

When the upper part of the door body 1 is subjected to the heat of a fire and warps and deforms in a direction that separates it from the door frame 3, the leak of flames and smoke through the resulting gap is prevented, thereby improving fire resistance. [Solution] An upper recessed groove 4c is provided in the upper horizontal frame member 4 of the door frame 3 facing the door body 1. An upper sealing member 9, a spring 12, and a heat-deformable member 11 are provided in the upper recessed groove 4c. When the heat of a fire is applied, the heat-deformable member expands and deforms, causing the upper sealing member 9 to come into contact with the interior side panel 1e of the door body, which has warped due to the heat deformation.

Description

Technical Field

[0001] The present invention relates to the technical field of door devices for opening and closing the entrances and exits of buildings such as buildings and houses.

Background Art

[0002] Generally, a door body is provided to open and close the entrance and exit of a building such as a building or a house. However, when such a door body (door leaf, door panel) encounters a fire in the closed state, the door body tends to warp and deform in a direction in which at least one of the upper and lower end portions is separated from the door frame. When the door body warps and deforms in this way, a gap is formed between the upper and lower face plates of the door body and the upper door frame, and there is a risk that smoke and flames will pass over the door through this gap, leading to concerns such as the spread of fire. By the way, in order to close the gap between such a door body and the door frame, a door frame side is provided with a plugging material (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional ones are provided with a heat-foaming material (heat-expanding material) that foams when receiving heat during a fire on the door frame side, and the foamed heat-foaming material is used to close the gap between the door frame and the door body. However, when the door body is warped and deformed away from the door frame by receiving heat during a fire in a state where the foaming temperature of the heat-foaming material is not reached, it does not correspond to the leakage of flames and smoke from the gap generated by the separation. As a result, as a fire prevention measure during a fire, it cannot be said that it is still sufficient, and these are the problems to be solved by the present invention.

Means for Solving the Problems

[0005] The present invention was created in view of the above circumstances and with the aim of solving these problems, and the invention of claim 1 is a door device comprising a rectangular frame-shaped door frame provided on the building structure side and having upper and lower horizontal frame members and left and right vertical frame members, and a door body whose hinge side is pivotally supported on the door frame so as to be able to open and close, and which closes in a fitted state with a gap remaining in the door frame, characterized in that a sealing material is provided on at least one of the upper and lower horizontal frame members and the edge of the door body facing the one horizontal frame member, to seal the gap between the one horizontal frame member and the opposing surface of the door body when the door body warps and deforms due to heat during a fire, causing a gap to form between the one horizontal frame member and the opposing surface of the door body. The invention of claim 2 is a door device according to claim 1, characterized in that one of the horizontal frame members is an upper horizontal frame member, and the upper horizontal frame member comprises a downward-facing piece facing the upper edge of the door body and an upper vertical-facing piece facing the upper edge of the door body's faceplate, and the closing member is arranged on at least one of the downward-facing piece and the upper vertical-facing piece. The invention of claim 3 is a door device according to claim 2, characterized in that the sealing material is fitted into an upper recessed groove formed in at least one of the downward-facing piece and the upper vertical-facing piece of the upper horizontal frame member. The invention of claim 4 is a door device according to claim 3, characterized in that a heat-deformable material is provided between the sealing material and the bottom surface of the upper recessed groove, which is thermally deformed by heat during a fire and moves the sealing material in a direction that protrudes from the upper recessed groove. The invention of claim 5 is a door device according to claim 4, characterized in that the upper recessed groove is formed on the upper vertical piece, the sealing material is fitted into the upper recessed groove so that its leading edge contacts the faceplate of the door body in a closed position before the heat-deformable material undergoes thermal deformation, and the heat-deformable material deforms in a direction that causes the sealing material to protrude from the upper recessed groove, so that the leading edge of the sealing material contacts the faceplate of the door body which has been warped. The invention of claim 6 is a door device according to claim 2, characterized in that the upper recessed groove portion is formed in a downward-facing piece portion and an upper vertical-facing piece portion, and the sealing material is fitted into both upper recessed groove portions formed in the downward-facing piece portion and the upper vertical-facing piece portion so as to contact the upper edge portion of the door body and the faceplate of the door body when the door body is in a normal state without thermal deformation, and even when the door body undergoes thermal deformation and the faceplate of the door body separates from the sealing material fitted into the recessed groove portion formed in the upper vertical-facing piece portion, the sealing material fitted into the recessed groove portion formed in the downward-facing piece portion is set to contact the upper edge portion of the door body. The invention of claim 7 is a door device according to claim 1, characterized in that one of the horizontal frame members is a lower horizontal frame member, and the closing member is formed on the lower horizontal frame member and provided on an upward-facing piece facing the lower edge of the door body, or formed on the lower horizontal frame member and provided on a downward vertical piece facing the lower edge of the door body's faceplate. The invention of claim 8 is a door device according to claim 7, characterized in that the sealing material is movably fitted into a lower recessed groove formed on the lower vertical piece of the lower horizontal frame material, and a heat-deformable material is provided between the sealing material and the bottom surface of the lower recessed groove, which is thermally deformed by heat in the event of a fire and moves the sealing material in a direction that protrudes from the lower recessed groove. The invention of claim 9 is a door device according to claim 7, characterized in that the sealing material is provided so as to be able to move toward and away from the upward-facing piece with a gap remaining with respect to the lower edge of the door body, and a heat-deformable material is fitted into the lower recessed groove provided in the lower horizontal frame material, which deforms when exposed to heat during a fire, causing the sealing material to move upward and bring it into contact with the lower edge of the door body. The invention of claim 10 is a door device according to claim 4, 5, 8, or 9, characterized in that a spring is provided between the sealing material and the heat-deformable material, or between the heat-deformable material and the bottom surface of the lower recessed groove, which biases the sealing material toward the door body, and the spring is set to have a biasing force such that the leading edge of the sealing material abuts against the opposing surface of the door in a natural state or a biased state close to the natural state, in the state before the heat-deformable material is thermally deformed. [Effects of the Invention]

[0006] By adopting the invention of claim 1, if the door body warps and deforms due to the heat during a fire, causing it to separate from the door frame, the gap created will be sealed by the sealing material, thereby maintaining airtightness between the door body and the door frame and preventing damage to fire resistance. By adopting the invention of claim 2, if the warping deformation of the door body occurs on the upper side of the door frame, the sealing material will be positioned on the downward-facing piece or the upper vertical-facing piece formed on the upper horizontal frame material, as this will allow for adaptation to the situation on site. As a result of the invention of claim 3, the sealing material is movably fitted into the upper recessed groove formed in at least one of the downward-facing piece and the upper vertical-facing piece of the upper horizontal frame material, making it possible to adapt to the situation on site. As a result of the inventions of claims 4 and 5, a heat-deformable material is provided between the sealing material and the bottom surface of the upper recessed groove, which deforms when exposed to the heat of a fire, causing the sealing material to move in a direction that protrudes from the upper recessed groove. Consequently, under normal conditions without a fire, it is not necessary to keep the sealing material in a state that corresponds to the warping deformation of the door body, and the opening and closing of the door body is not hindered. By adopting the invention of claim 6, even if the door body undergoes thermal deformation and the faceplate of the door body separates from the sealing material incorporated into the recessed groove formed in the upper vertical piece, the invention will be able to accommodate the warping deformation of the door body. By adopting the invention of claim 7, if the warping deformation of the door body occurs on the lower side of the door body, the sealing material will be provided on the upward-facing piece or the downward-facing vertical piece formed on the lower horizontal frame material, as this will allow for adjustments to suit the situation on site. By adopting the invention of claim 8, the sealing material is movably fitted into the lower recessed groove formed on the lower vertical piece of the lower horizontal frame member, and the sealing material follows the lower part of the door body which warps and deforms due to the heat of the fire, thereby effectively avoiding the formation of a gap. By adopting the invention of claim 9, the sealing material, which is provided on the upward-facing piece so as to be able to move toward and away from the lower edge of the door body while maintaining a gap with the lower edge of the door body, will come into contact with the lower edge of the door body due to the thermal deformation of the heat-deformable material provided in the lower groove during a fire, and will seal the gap between the door frame and the door frame which has warped and deformed, thereby contributing to improved fire resistance. By implementing the invention of claim 10, the elastic mechanism provided between the sealing material and the heat-deformable material, or between the heat-deformable material and the groove bottom piece of the lower recessed groove, allows the sealing material to contact the opposing surface of the door in a natural or near-natural biased state during normal times when there is no fire, thus preventing any obstruction to the opening and closing of the door body. However, when the heat-deformable material is thermally deformed by the heat during a fire, this elastic mechanism functions to cause the sealing material to contact the warped and deformed door body panel in an elastic manner, thereby providing high airtightness support and a high fire-resistant effect. [Brief explanation of the drawing]

[0007] [Figure 1] This is a front view of the door mechanism. [Figure 2] This is a cross-sectional plan view of the door mechanism. [Figure 3] This is a cross-sectional side view of the door mechanism. [Figure 4] This is a cross-sectional side view of a door device in a state where the door body has warped and deformed due to heat. [Figure 5] This is a cross-sectional side view of a door device showing a second embodiment, in which the upper portion is deformed from its normal state by warping. [Figure 6] This is a cross-sectional side view of a door device showing a third embodiment, in which the upper portion is deformed from its normal state by warping. [Figure 7] This is a cross-sectional side view of a door device showing a fourth embodiment, in which the upper portion is deformed from its normal state by warping. [Figure 8] This is a cross-sectional side view of a door device showing a fifth embodiment, in which the upper portion is deformed from its normal state by warping. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a door body provided to open and close an entrance / exit portion E. The door body 1 is pivotally attached to a door frame 3 provided on a building side member G so as to open to the outdoor side via a hinge 2, etc., all of which are the same as in the prior art. Note that the opening and closing direction of the door body 1 is not limited to the outdoor side, and of course, it may be the indoor side. The door frame 3 is formed in a rectangular frame shape using an upper horizontal frame member 4, a lower horizontal frame member 5, vertical frame members 6 on the hanging side (door butt side) on the left and right of the door body 1, and a vertical frame member 7 at the door tip side. The door body 1 is pivotally supported on the vertical frame member 6 on the hanging side via a hinge 2 so as to be openable and closable.

[0009] On the hanging side, the left and right vertical frame members 6 and 7 include projected pieces 6a and 7a that face the door butt side edge portion 1a and the door tip side edge portion 1b, which are the left and right edge portions of the door body 1, with a gap (clearance), and finding pieces 6b and 7b that face the indoor side panel 1e of the door body 1 with a gap. Thus, the opposing surface portion with the door body 1 is configured in an L shape. And in the finding side concave groove portions 6c and 7c provided on the finding pieces 6b and 7b, an airtight material 8a that abuts against the indoor side panel 1e of the closed door body 1 is provided. And in the present embodiment, in order to ensure airtightness during a fire, a heat expansion material (for example, Fiblock (registered trademark)) 8 that expands (foams) when receiving heat is provided on the surface portions of the door butt side edge portion 1a, the door tip side edge portion 1b of the door body 1, and the push edge members 6d and 7d that are detachably provided to form the finding side concave groove portions 6c and 7c.

[0010] On the other hand, the upper horizontal frame member 4 includes a downward piece 4a that faces the upper edge portion 1c of the door body 1 and an upper vertical piece 4b that faces the upper edge portion of the indoor side panel 1e of the door body 1. Thus, similar to the case of the left and right vertical frame members 6 and 7, the opposing surface with the door body 1 is configured in an L shape. In contrast, the lower horizontal frame member (threshold) 5 has a planar configuration with only an upward piece 5a that faces the lower edge portion 1d of the door body 1.

[0011] In the door body 1 configured as described above, upper and lower closing members 9 and 10 are provided between the upper horizontal frame member 4, the lower horizontal frame member 5 and the upper edge portion 1c and the lower edge portion 1d of the door body 1 to cope with the case where the door body 1 warps and deform under the heat during a fire and the opposing interval expands. Incidentally, F is the floor surface. Incidentally, as the closing members 9 and 10, only the upper closing member 9 that closes the space between the upper horizontal frame member 4 and the upper edge portion 1c of the door body 1, or only the lower closing member 10 that closes the space between the lower horizontal frame member 5 and the lower edge portion 1d of the door body 1 may be provided, and these correspondences can be appropriately selected as necessary.

[0012] First, the configuration of the upper closing member 9 that closes the space between the upper horizontal frame member 4 and the upper edge portion 1c of the door body 1 will be described based on FIG. 3. An upper concave groove portion 4c is formed in the upper vertical piece portion 4b of the upper horizontal frame member 4 so as to face the upper edge portion of the indoor side panel 1e of the door body 1, and the upper closing member 9 is incorporated into the upper concave groove portion 4c so as to be able to move in and out. In the upper concave groove portion 4c, a heat deformation member 11 made of, for example, a shape memory alloy and an elastic mechanism 12 that biases the upper closing member 9 to abut against the upper edge portion 1ea of the indoor side surface 1e of the door body 1 in a natural state or a state close to the natural state and closes the space between the door body 1 and the door frame 3 during normal times are further fitted and incorporated. In the first embodiment, the base end of the heat deformation member 11 in the reduced state before heat deformation is incorporated in a state of abutting against the groove bottom surface portion 4ca of the upper concave groove portion 4c with respect to the upper concave groove portion 4c, and further, the base end of the elastic mechanism 12 is incorporated in a state of abutting against the tip of the heat deformation member 11 via the support plate 13, and the tip of the elastic mechanism 12 is configured to abut against the base end of the upper closing member 9. The elastic mechanism 12 is set to abut against the indoor side panel 1e of the door body 1 with a natural or near-natural biasing force when the door body 1 is closed in the normal state, so that the airtightness between the door body 1 and the door frame 3 in the normal state can be exhibited without imposing a burden on the closing movement of the door body 1. Incidentally, it goes without saying that the combined structure of the heat-deformable material 11 and the elastic mechanism 12 is provided in multiple configurations with gaps in the left-right direction. Furthermore, the arrangement of the heat-deformable material 11 and the elastic mechanism 12 may be reversed.

[0013] When such a door body 1 is subjected to heat during a fire and its upper portion warps and deforms in a direction that separates it from the door frame 3, as shown in Figure 4, the heat-deformable material 11 fitted into the upper recessed groove 4c will be thermally deformed and expand. As a result of this expansion, the upper sealing material 9 will come into contact with the interior side panel 1e of the door body 1, thereby maintaining airtightness. In this case, the elastic mechanism 12, which is interposed between the upper sealing material 9 and the heat deformation material 11, expands and contracts in response to the warping deformation of the upper edge portion 1c of the door body 1. This allows for the maintenance of airtightness even when the warping deformation of the upper edge portion 1c is so large that the extension length of the heat deformation material 11 is insufficient. Furthermore, the contact of the upper sealing material 9 with the interior side panel 1e in the warped state is subject to the biasing force of the elastic mechanism 12, thus enabling the maintenance of higher airtightness and contributing to the prevention of fire spread.

[0014] Next, we will describe the lower closing member 10 provided on the lower horizontal frame member 5. The lower horizontal frame member 5 is made of a C-shaped profile with an open top surface, thereby forming a lower recessed groove 5c. The lower thermal deformation member 14, which is made of a material that expands when heated, similar to the thermal expansion member 8, is filled into this lower recessed groove 5c in the left-right direction (width direction of the opening). Furthermore, a flat plate-shaped lower closing member 10 is provided on the upward-facing piece 5a, which is the open upper surface of the lower horizontal frame member 5, with a gap (clearance) between it and the lower edge 1d of the door body 1.

[0015] When the door body 1, configured in this manner, is subjected to heat during a fire and undergoes warping deformation at its lower edge 1d, causing it to move away from the door frame 3, the heat-deformable material 14 filled in the lower groove 5c expands upon receiving heat, causing the lower sealing material 10 to move upward. This seals the widened gap between the lower horizontal frame material 5 and the lower edge 1d of the door body 1, thus maintaining airtightness even at the lower side of the door body 1 when it warps. In this embodiment as well, the thermal expansion material 8 is provided on the upper and lower edge portions 1c and 1d of the door body 1, and on the upper vertical portion 4b of the door frame 3. Incidentally, in this embodiment, in addition to the heat-deformable materials 11 and 14, a heat-expandable material 8 is also provided to further address the situation in the event of a fire. However, the heat-deformable materials 11 and 14 are configured to deform at a lower temperature than the heat-expandable material 8. As a result, in this embodiment, when heat is received during a fire, the heat-deformable materials 11 and 14 first deform, exhibiting a first fire-prevention function. Furthermore, if the fire progresses and the temperature rises, the heat-expandable material 8 expands, sealing the gaps and exhibiting a second fire-prevention function. This ensures that the device exhibits high fire-prevention performance.

[0016] In this embodiment, configured as described above, when the upper and lower edges of the door body 1 are subjected to heat during a fire and deform in a direction that separates them from the door frame 3, the upper sealing material 9 provided on the upper vertical piece 4b of the upper horizontal frame member 4 of the door frame 3 moves in a direction that protrudes from the upper recessed groove 4c by the heat-deformed material 11 that has been stretched by the heat deformation, and comes into contact with the interior side panel 1e on the upper edge side of the door body 1 that has moved in a direction that separates it, thereby maintaining airtightness.

[0017] In this case, the upper sealing material 9 that abuts against the interior side panel 1e normally abuts against the interior side panel 1e in a natural state or a state close to natural state due to the elastic mechanism 12 to maintain airtightness. However, in the emergency situation when a fire breaks out, if the warping deformation of the upper edge side of the door body 1 is within the range of the natural state in which the heat deformation material 11 is fully extended and the elastic mechanism 12 is fully extended, the upper sealing material 9 will abut against the interior side panel 1e in a compressed state due to the biasing force of the elastic mechanism 12, resulting in a more airtight contact and contributing to improved fire resistance.

[0018] Furthermore, on the lower edge side of the door body 1, the lower sealing member 10 provided on the upward-facing piece 5a of the lower horizontal frame member 5 comes into contact with the lower edge 1d of the door body 1, which has warped due to the thermal expansion of the heat-deformable material 14 provided in the lower recessed groove 5c formed in the lower horizontal frame member, thereby maintaining airtightness.

[0019] It should be noted that the present invention is not limited to the embodiments described above, and can also be implemented by providing a similar structure for the sealing material on the door body 1 side instead of the door frame 3 side. Furthermore, the present invention can also be implemented as shown in the embodiments from Figure 5 onward.

[0020] The second embodiment shown in Figure 5 is designed to address the case where the upper edge of the door body 1 is warped. The difference between this embodiment and the first embodiment is that the elastic mechanism 12 is not provided. Otherwise, it has a substantially similar structure, except that the length of the heat-deformable material 11 is longer and the support plate 13 is absent. While this second embodiment is inferior in that it cannot be expected to provide repressive contact with the upper sealing material 9 by the elastic mechanism 12, it can still accommodate the warping deformation of the door body 1.

[0021] Furthermore, the third embodiment shown in Figure 6 also addresses the case where the upper edge of the door body 1 is warped and deformed. In this embodiment, the upper horizontal frame member 4 is provided with a first sealing member 15 that functions under normal circumstances when there is no fire, and a second sealing member 16 that functions not only under normal circumstances but also when the door body 1 is warped and deformed. The first sealing member 15 is fitted into a groove 4d provided in the upper vertical piece 4b of the upper horizontal frame member 4, and the second sealing member 16 is fitted into a groove 4e provided in the lower piece 4a of the upper horizontal frame member 4. In this case, the second sealing member 16 is provided extending in the left-right direction, facing the upper edge 1c of the door body 1. The first sealing material 15 maintains airtightness by contacting the interior side panel 1e of the door body 1 during normal times when there is no fire. However, when the upper edge of the door body 1 warps and deforms due to the heat of a fire, separating it from the door frame 3, the second sealing material 16 will also separate from the interior side panel 1e. The second sealing material 16 is configured to contact the interior side portion of the upper edge 1c of the door body 1, which has been lifted by the warping deformation of the upper edge 1c of the door body 1 when the upper edge of the door body 1 warps and deforms due to the heat of a fire, resulting in a stronger contact than usual and thus maintaining airtightness.

[0022] Next, the fourth embodiment shown in Figure 7 is designed to address the case where the lower edge of the door body 1 is warped. In this embodiment, the lower horizontal frame member 5 is provided with two adjacent lower recessed grooves 5c in the front-to-back direction, and an auxiliary recessed groove 5d is provided between the two adjacent lower recessed grooves 5c. Incidentally, the lower recessed grooves 5c can be arranged in multiples of three or more in the front-to-back direction as needed, rather than just two. Multiple such grooves arranged in the front-to-back direction are then provided with gaps between them in the left-to-right direction. The lower recessed grooves 5c at the front and rear are fitted with a lower sealing material 10, an elastic element 12, a support plate 13, and a heat-deformable material 11 in the same configuration as in the first embodiment. Furthermore, the support 17 provided on the lower sealing material 10 is loosely fitted into the auxiliary groove 5d. Furthermore, if the lower part of the door body 1 is affected by the heat of the fire and warps away from the door frame 3, the lower sealing member 10 will move upward due to the expansion caused by the thermal deformation of the heat deformation material 11 and come into contact with the lower edge portion 1d of the door body 1. At the same time, the front and back of the auxiliary groove portion 5d will be sealed by the support 17 which has moved upward, thereby enabling sealing in the event of warping deformation of the door body 1. Furthermore, since the support 17 is loosely fitted into the auxiliary groove 5d, it is configured to accommodate upward movement even when the lower sealing material 10 is tilted.

[0023] Furthermore, the fifth embodiment shown in Figure 8 is designed to address the case where the lower edge of the door body 1 is warped. In this embodiment, the stepped lower horizontal frame member 5 has not only an upward-facing piece 5a facing the lower edge 1d of the door body 1, but also a downward vertical piece 5b. A lower recessed groove 5c with a groove bottom surface 5ca is formed in this lower recessed groove 5c, and a lower closing member 10, a heat-deformable material 11 that abuts the groove bottom surface 5ca, and an elastic mechanism 12, similar to those used in the first and fourth embodiments, are incorporated into this lower recessed groove 5c. These heat-deformable material 11 and elastic mechanism 12 are provided in multiple quantities in the left-right direction, similar to the embodiments described above. Furthermore, if the lower part of the door body 1 is subjected to the heat of a fire and deforms in a direction that separates it from the door frame 3, the lower sealing material 10 will deform in accordance with the expansion of the heat-deformable material 11, and will come into contact with the lower edge 1eb of the interior side panel 1e of the door body 1, thereby maintaining airtightness. Incidentally, it goes without saying that the sealing structure between the door frame 3, which has been warped and deformed using the heat-deformable material 11 and elastic material 12, can also be implemented in the same way on the airtight material 8a side of the left and right vertical members 6 and 7. [Industrial applicability]

[0024] This invention can be used as a door device for opening and closing entrances to buildings such as office buildings and houses. [Explanation of Symbols]

[0025] 1 Door Body 1a Door end edge 1b Door edge on the front side 1c Upper edge 1d Lower edge 1e Interior side panel (door panel) 1ea top edge 1eb Bottom edge 3 Door frame 4. Upper horizontal frame material 4a Downward-facing piece 4b Upper vertical piece 4c Upper groove part 4ca groove bottom part 4d Groove 4e Concave groove 5. Lower horizontal frame material 5a Upward-facing portion 5b Lower vertical piece 5c Lower groove part 5ca Groove bottom part 6. Vertical frame material on the hanging side 7. Vertical frame material on the door front side 9. Upper sealing material 10 Lower sealing material 11. Heat-deformable material 12 ammunition 14. Heat-deformable material 15. First sealing material 16. Second sealing material

Claims

1. In a door device comprising a rectangular door frame provided on the building structure side and equipped with upper and lower horizontal frame members and left and right vertical frame members, and a door body whose hinge side is pivotally supported on the door frame so as to be able to open and close, and which closes in a fitted state with a gap remaining in the door frame, A door device characterized in that a sealing material is provided on at least one of the upper and lower horizontal frame members and the edge of the door body facing the said horizontal frame member, to close the gap between the one horizontal frame member and the opposing surface of the door body when the door body warps and deforms due to heat during a fire, causing a gap to form between the one horizontal frame member and the opposing surface of the door body.

2. One of the horizontal frame members is the upper horizontal frame member, and this upper horizontal frame member is composed of a downward-facing piece facing the upper edge of the door body and an upper vertical-facing piece facing the upper edge of the door body's faceplate. The door device according to claim 1, characterized in that the sealing material is provided on at least one of the downward-facing piece and the upper vertical-facing piece.

3. The door device according to claim 2, characterized in that the sealing material is fitted into an upper recessed groove formed in at least one of the downward-facing piece and the upper vertical-facing piece of the upper horizontal frame member.

4. The door device according to claim 3, characterized in that a heat-deformable material is provided between the sealing material and the bottom surface of the upper recessed groove, which is thermally deformed by heat during a fire and moves the sealing material in a direction that protrudes from the upper recessed groove.

5. The upper recessed groove is formed on the upper vertical piece. The sealing material is fitted into the upper recessed groove so that its leading edge contacts the door panel in the closed position before the heat-deformable material undergoes thermal deformation. The door device according to claim 4, characterized in that the heat-deformable material is configured to deform in a direction that causes the sealing material to protrude from the upper recessed groove, thereby causing the leading edge of the sealing material to abut against the warped door panel.

6. The upper recessed groove is formed with a downward-facing piece and an upper vertical-facing piece. The door device according to claim 2, characterized in that the sealing material is fitted into the upper recessed grooves formed in the downward-facing piece and the upper vertical-facing piece so as to contact the upper edge of the door body and the faceplate of the door body when the door body is in a normal state without thermal deformation, and even when the door body undergoes thermal deformation and the faceplate of the door body separates from the sealing material fitted into the recessed groove formed in the upper vertical-facing piece, the sealing material fitted into the recessed groove formed in the downward-facing piece is set to contact the upper edge of the door body.

7. One of the horizontal frame members is the lower horizontal frame member. The door device according to claim 1, characterized in that the sealing material is formed on the lower horizontal frame member and provided on an upward-facing piece facing the lower edge of the door body, or on a lower vertical piece formed on the lower horizontal frame member and facing the lower edge of the door body's faceplate.

8. The sealing material is movably fitted into the lower recessed groove formed in the lower vertical piece of the lower horizontal frame member. The door device according to claim 7, characterized in that a heat-deformable material is provided between the sealing material and the bottom surface of the lower recessed groove, which deforms due to heat during a fire and moves the sealing material in a direction that protrudes from the lower recessed groove.

9. The sealing material is provided on the upward-facing portion of the door body so as to be able to move toward and away from the lower edge portion, while maintaining a gap between it and the door body. The door device according to claim 7, characterized in that a heat-deformable material is fitted into the lower recessed groove provided in the lower horizontal frame material, which deforms due to heat in the event of a fire, causing the sealing material to move upward and bring the sealing material into contact with the lower edge of the door body.

10. A spring mechanism is provided between the sealing material and the heat-deformable material, or between the heat-deformable material and the bottom surface of the lower recessed groove, to bias the sealing material toward the door body. The door device according to claim 4, 5, 8, or 9, characterized in that the biasing force is set so that the leading edge of the sealing material contacts the opposing surface of the door surface in a natural state or a biased state close to the natural state, before the thermal deformation of the heat-deformable material.

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