JP7736769B2 - Building materials - Google Patents

Description

This invention relates to building materials, and more specifically to fire prevention measures for building materials that have secondary shoji screens between building materials such as frames and stiles.

Some building materials include a secondary shoji screen for ventilation inside the frame that makes up the shoji screen. A secondary shoji screen has a secondary panel supported between secondary building materials that can be opened and closed, and is installed, for example, on top of the shoji screen. With this type of building material, opening the secondary shoji screen allows ventilation even when the shoji screen is closed, which is advantageous in terms of operability and security (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2016-8451

Nowadays, building materials often require high levels of fire resistance. In the case of building materials that do not have secondary shoji screens, fire resistance is enhanced by, for example, placing a thermal expansion member between the frame and face material that make up the shoji screen. In other words, in this type of building material, when the shoji screen is exposed to high temperatures, the thermal expansion member expands, sealing the gap between the frame and face material, preventing flames from penetrating into the room or outside.

On the other hand, to improve the fire resistance of building materials equipped with secondary shoji screens, in addition to placing a thermal expansion member between the frame and face material of the shoji screen, it is also possible to place a secondary thermal expansion member between the secondary building material and the secondary face material of the secondary shoji screen. With such building materials, it is possible to prevent physical penetration holes from occurring between the secondary building material and the secondary face material of the secondary shoji screen. However, in actual building materials, there is a concern that flames may occur on the non-heated side of the secondary shoji screen, and there is still room for improvement. That is, in building materials equipped with secondary shoji screens, there is a space between the secondary building material and the frame of the shoji screen, and this space is connected to the gap between the frame and the face material. For example, if flammable gas is generated from the face material due to exposure to high temperatures, it will reach the gap between the secondary building material and the frame of the shoji screen. If this flammable gas is then ejected onto the non-heated side of the secondary shoji screen, it may cause a flame to occur.

The above-mentioned problem is not limited to the area between the frame and the secondary shoji screen, but can also occur in fixed windows, for example, where the panel and secondary shoji screen are mounted on the frame.

In light of the above situation, the present invention aims to provide a fixture that can improve the fire resistance of buildings equipped with secondary shoji screens.

In order to achieve the above object, the fitting according to the present invention comprises a frame body and a shoji screen disposed on the frame body, the shoji screen having a surface material and a ventilation unit inside the four-sided assembled building material, the ventilation unit having a sub-frame body and a sub-surface material supported inside the sub-frame body via a sub-bottom frame that constitutes the sub-frame body so as to be able to open and close, a latch that maintains the sub-surface material in a closed position is provided between the sub-upper frame that constitutes the sub-frame body and the sub-surface material, the sub-vertical frame, the sub-upper frame, and the sub-bottom frame that constitute the sub-frame body each have an inner fin portion that faces inward on the room side, and an inner seal member is attached to the visible surface of the inner fin portion that faces the room, and the sub-upper frame and the sub-vertical frame each have an inner fin portion that faces inward on the room side, an outer fin portion is provided toward the inner periphery on the portion facing the outside of the room, an outer sealing member is attached to the outer fin portion, the secondary panel has a face plate portion that abuts against the inner sealing member from the inside of the room when the secondary panel is placed in the closed position, and a square tube portion that is provided on the visible surface of the face plate portion facing the outside of the room and abuts against the outer sealing member, the lower edge portion of the face plate is rotatably supported by the secondary lower frame, the inner fin portion of the secondary lower frame has a portion that is closer to the inner periphery than the rotation support portion of the secondary panel, the inner sealing member is attached to this inner portion, and a thermal expansion member is provided between the sub-frame body and the secondary panel, in a portion that is closer to the outdoor space than the inner sealing member.

According to this invention, when the fitting is exposed to high temperatures, the thermally expandable member expands, blocking the storage space between the building material and the secondary building material. Therefore, even if flammable gas is generated from the surface material, this flammable gas will not reach the secondary shoji screen, eliminating the risk of it catching fire on the unheated side of the secondary shoji screen.

1 is a view of a fitting according to an embodiment of the present invention as seen from the inside of a room. FIG. 2 is a vertical cross-sectional view of the fixture shown in FIG. 1 . FIG. 2 is a cross-sectional view of the fixture shown in FIG. 1 cut at the sub-shōji portion. FIG. 2 is a cross-sectional view of the fitting shown in FIG. 1 cut at the surface material portion. FIG. 2 is an exploded cross-sectional view of the interior shoji screen of the fixture shown in FIG. 1 with the sub-shōji screen removed. 2A and 2B show a sub-shoji screen to be applied to the fixture shown in FIG. 1, where FIG. 2A is a view from inside the room and FIG. 2B is a view from outside the room. FIG. 7 is a vertical cross-sectional view of the secondary shoji screen shown in FIG. 6 with the secondary panel member positioned in the closed position. FIG. 7 is a vertical cross-sectional view of the secondary shoji screen shown in FIG. 6 with the secondary panel member positioned in the open position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the fittings according to the present invention will be described in detail below with reference to the accompanying drawings.
1 to 4 show a fitting according to an embodiment of the present invention. The fitting shown here is a so-called sliding window, in which two shoji screens (inner and outer panels 20, 30) are arranged to slide left and right relative to a frame body 10. The frame body 10 is formed into a rectangular shape by framing it all around with an upper frame 11, a lower frame 12, and left and right vertical frames 13, 14.

The outer shoji screen 20, located on the exterior side of the frame 10, is constructed by placing rectangular double-glazed glass 25 inside a top frame 21, a bottom frame 22, and left and right vertical frames 23, 24, which are all framed together. The inner shoji screen 30, located on the interior side of the frame 10, is constructed by arranging rectangular double-glazed glass (face material) 35 and a rectangular ventilation unit (sub-shoji screen) 40 adjacent to each other above and below inside a top frame 31, a bottom frame 32, and left and right vertical frames 33, 34, which are all framed together. The double-glazed glass 25 of the outer shoji screen 20 and the double-glazed glass 35 of the inner shoji screen 30 are each constructed by bonding multiple (e.g., two) glass panes G together via spacer members S.

The outer shoji screen 20 and inner shoji screen 30 are approximately the same in size on both sides, and are sized so that the frame 10 can be closed when the mating vertical frames 23, 33 are aligned side by side in the forward direction. In this embodiment, a fitting is exemplified in which, when the frame 10 is closed, the outer shoji screen 20 is positioned on the left side as viewed from the inside of the room, and the inner shoji screen 30 is positioned on the right side as viewed from the inside of the room. However, this is not necessarily the case, and a sliding window in which the inner shoji screen 30 and outer shoji screen 20 are positioned left and right reversely may also be used.

The aforementioned "prospect direction" here refers to the direction along the depth of the fixture, as indicated by arrow A in the figure. A surface along the prospect direction may be referred to as a "prospect surface." For convenience, this embodiment also uses the term "visit direction." In the case of building materials that extend horizontally, such as the upper frame 11 and lower frame 12, the prospect direction is the direction perpendicular to the prospect direction, running vertically. In the case of building materials that extend vertically, such as vertical frames 13 and 14, the prospect direction is the horizontal direction perpendicular to the prospect direction. A surface along the prospect direction may be referred to as a "visit surface."

Below, we will provide a detailed description of the configuration of the inner shoji screen 30 equipped with the ventilation unit 40, as well as an explanation of the characteristics of the present invention.

The upper frame 31, lower frame 32, and left and right vertical frames (building materials) 33, 34 that make up the inner shoji screen 30 are extruded shapes formed from metal such as aluminum alloy, and are configured to have a nearly uniform cross-sectional shape along their entire length. As shown in Figures 2 and 5, these frames 31, 32, 33, 34 have storage sections 31a, 32a, 33a, 34a formed on the facing inner peripheral surfaces of the frames 31, 32, 33, 34. The storage sections 32a, 33a, 34a of the lower frame 32 and the left and right vertical frames 33, 34 accommodate the edges of the double-glazed glass 35 when the glazing channel B is installed, and are formed between support fins 32b, 33b, 34b that protrude from the inside and outside of the room so as to face each other.

The double-glazed glass 35 has approximately the same left-to-right dimensions as the double-glazed glass 25 of the outer shoji screen 20, with both edges housed in the housing portions 33a and 34a of the vertical frames 33 and 34, respectively. The top-to-bottom dimensions of the double-glazed glass 35 are shorter than those of the double-glazed glass 25 of the outer shoji screen 20. Therefore, the lower edge of the double-glazed glass 35 is housed in the housing portion 32a of the bottom frame 32, while there is a gap between the upper edge and the top frame 31. Note that the reference numeral 36 in Figure 2 denotes a setting block that is positioned between the bottom frame 32 and the end face of the double-glazed glass 35 to position the double-glazed glass 35 relative to the inner shoji screen 30.

The storage sections 33a, 34a of the vertical frames 33, 34 are each provided with a heat-expandable foaming material C1 along their entire length. The heat-expandable foaming material C1 is a non-flammable or flame-retardant fire-resistant material that expands when heated. For example, this type of heat-expandable foaming material C1 can be so-called expandable graphite, which contains thermally expandable graphite.

As shown in Figures 5 to 8, the ventilation unit 40 comprises a rectangular sub-frame 410 and a sub-surface member 420 supported by the sub-frame 410 in a state that opens and closes the opening of the sub-frame 410. It is disposed in the rectangular area formed between the upper frame 31, the left and right vertical frames 33, 34, and the upper edge surfaces of the double-glazed glass 35.

The sub-frame 410 is constructed by framing all four sides of the sub-upper frame 411, sub-lower frame 412, and left and right sub-vertical frames (secondary building materials) 413. The sub-upper frame 411, sub-lower frame 412, and left and right sub-vertical frames 413 are extruded shapes formed from metal such as aluminum alloy, and are constructed to have a nearly uniform cross-sectional shape along their entire length.

The secondary upper frame 411 has a flat upper frame base 411a that extends approximately horizontally along the front-to-rear direction. An inner upper abutment fin 411b extends downward on the underside of the upper frame base 411a, which faces the interior of the room, while an outer upper abutment fin 411c extends downward on the edge of the underside of the upper frame base 411a, which faces the exterior of the room. The outer upper abutment fin 411c has a larger protruding dimension than the inner upper abutment fin 411b, and its lower edge is bent at an approximately right angle toward the interior of the room. Sealing members 415 and 416 are attached to the facing surfaces of the inner upper abutment fin 411b and outer upper abutment fin 411c, respectively, that face the interior of the room. Additionally, two engaging upper fins 411d, 411e and an upper screw hole 411f are provided on the top surface of the upper frame base 411a. The engaging upper fins 411d, 411e protrude upward from the top surface of the upper frame base 411a. The distance between the outer surfaces of these two engaging upper fins 411d, 411e is dimensioned to allow them to fit into the storage section 31a of the upper frame 31. The upper screw hole 411f is open on both the left and right ends and is formed in the area between the two engaging upper fins 411d, 411e.

The sub-bottom frame 412 has a flat bottom frame base 412a that extends approximately horizontally along the front-to-rear direction. Two engaging fins 412b extending downward are provided on the outside and inside edges of the bottom frame base 412a, respectively, and an inner trapezoidal fin 412c is provided on the top surface of the bottom frame base 412a at a location approximately midway along the front-to-rear direction. The two engaging fins 412b form a sub-frame storage section 412d between the bottom frame base 412a and the bottom frame base 412a, which has the same dimensions as the storage section 31a of the upper frame 31, and are provided to protrude from both side edges of the bottom frame base 412a. The inner trapezoidal fin 412c protrudes upward from the top surface of the bottom frame base 412a, then bends at an approximately right angle and extends approximately horizontally toward the inside of the room. Lower screw holes 412e are provided at the bent inner corners of the inner trapezoidal fin portion 412c, and seal members 417 are attached to the extending edges of the inner trapezoidal fin portion 412c. Like the upper screw holes 411f, the lower screw holes 412e are configured to be open at both left and right ends. Furthermore, a support base fin portion 412f is provided on the interior-facing surface of the engaging fin portion 412b provided on the interior side. The support base fin portion 412f is flat and extends almost horizontally from the engaging fin portion 412b toward the interior side of the room. A hinge shaft element 412g is provided on the upper surface of the support base fin portion 412f, forming a profile hinge between it and the secondary panel 420 (described below).

The left and right sub-vertical frames 413 are symmetrical to each other. In this embodiment, the sub-vertical frames 413 are constructed by providing inner vertical abutment fins 413b and outer vertical abutment fins 413c on flat vertical frame bases 413a extending approximately vertically along the front-view direction. The inner vertical abutment fins 413b extend inward from the interior-facing portions of the opposing inner surfaces of the vertical frame bases 413a. The outer vertical abutment fins 413c extend inward from the exterior-facing edges of the opposing inner surfaces of the vertical frame bases 413a, and are configured with a larger protruding dimension than the inner vertical abutment fins 413b. Sealing members 418, 419 are attached to the interior-facing surfaces of the inner vertical abutment fins 413b and outer vertical abutment fins 413c, respectively. Additionally, two mating vertical fins 413d, 413e are provided on the outer surface of the vertical frame base 413a. The mating vertical fins 413d, 413e protrude outward from the outer surface of the vertical frame base 413a. The distance between the outer surfaces of these two mating vertical fins 413d, 413e is dimensioned so that they can fit into the storage sections 33a, 34a of the vertical frames 33, 34.

These sub-vertical frames 413 have screw insertion holes (not shown) at locations corresponding to the upper screw holes 411f of the sub-upper frame 411 and the lower screw holes 412e of the sub-lower frame 412. Screws 430 are threaded into the upper screw holes 411f and lower screw holes 412e through these screw insertion holes to form the sub-frame body 410 together with the sub-upper frame 411 and the sub-lower frame 412. When the sub-frame body 410 is constructed, the seal member 417 provided on the inner trapezoidal fin portion 412c of the sub-lower frame 412, the seal member 415 provided on the inner upper abutment fin portion 411b of the sub-upper frame 411, and the seal member 418 provided on the inner vertical abutment fin portion 413b of the sub-vertical frame 413 are all arranged on the same vertical plane. In addition, the seal member 419 provided on the outer vertical abutment fin portion 413c and the seal member 416 provided on the outer upper abutment fin portion 411c of the sub-upper frame 411 are arranged on the same vertical plane.

As shown in Figures 2 and 3, the sub-frame 410 having the above-described configuration is attached to the upper portion of the inner sash 30 by fitting the upper engaging fins 411d, 411e on the sub-upper frame 411 into the receiving portion 31a of the upper frame 31, and fitting the vertical engaging fins 413d, 413e on the sub-vertical frame 413 into the receiving portions 33a, 34a of the vertical frames 33, 34, respectively. In this state, the upper edge of the double-glazed glass 35 is housed in the sub-frame receiving portion 412d formed by the engaging fins 412b on the sub-bottom frame 412, and the ventilation unit 40 closes the gap between the upper frame 31 and the double-glazed glass 35. Although not shown in the figure, the engagement fins 412b protruding from both sides of the base 412a of the sub-bottom frame 412 are inserted into the receiving sections 33a and 34a through notches in the vertical frames 33 and 34, respectively, and function to prevent the sub-frame body 410 from moving vertically relative to the vertical frames 33 and 34. Therefore, the double-glazed glass 35 of the inner shoji screen 30 is supported on all four sides by the sub-bottom frame 412 of the sub-frame body 410, the bottom frame 32 of the frame body 10, and the left and right vertical frames 33 and 34.

As shown in FIGS. 5 to 8, the secondary panel 420 is constructed by attaching side plates 422 to both side ends of a panel base 421.
The surface material base 421 is formed integrally with a rectangular flat plate-shaped surface plate 421a and a rectangular tube portion 421b provided on the surface of the surface plate 421a facing the outside of the room.

The face plate portion 421a is sized so that it can be placed in the rectangular opening formed by the upper sub-frame 411, the lower sub-frame 412, and the left and right sub-vertical frames 413. More specifically, the top and bottom of the face plate portion 421a are sized so that it can simultaneously cover the seal member 415 provided on the inner upper abutment fin portion 411b of the upper sub-frame 411 and the seal member 417 provided on the inner platform fin portion 412c of the lower sub-frame 412. The left and right sides of the face plate portion 421a are formed with dimensions smaller than the distance between the outer vertical abutment fin portions 413c of the vertical frame 413. A hinge receiving element 421c is provided on the lower edge of this face plate portion 421a. The hinge receiving element 421c forms a profile hinge with the hinge shaft element 412g of the lower sub-frame 412 described above. That is, the hinge receiving element 421c engages with the hinge shaft element 412g of the sub-bottom frame 412 to rotatably support the face plate portion 421a relative to the sub-bottom frame 412. In this embodiment, the profile hinge is configured so that the face plate portion 421a can rotate around a hinge shaft extending horizontally to the left and right. This allows the face plate portion 421a to move between a closed position along the vertical direction as shown in FIG. 7 and an open position in which the upper edge protrudes toward the interior of the room as shown in FIG. 8. When the face plate portion 421a is positioned in the closed position, the seal member 415 of the inner upper abutment fin portion 411b and the seal member 417 of the inner trapezoidal fin portion 412c are each pressed against the surface of the face plate portion 421a facing the exterior. On the other hand, when the face plate portion 421a is positioned in the open position, the seal member 415 of the inner upper abutment fin portion 411b and the seal member 417 of the inner trapezoidal fin portion 412c are spaced apart from the face plate portion 421a.

Note that reference numeral 440 in Figure 8 denotes a link mechanism provided between the sub-vertical frame 413 of the sub-frame body 410 and the sub-panel 420. This link mechanism 440 limits the opening angle of the sub-panel 420 relative to the sub-frame body 410 by abutting a slider 441 provided on the sub-frame body 410 against a stopper member 442. Reference numeral 450 in Figure 7 denotes a latch that engages with the sub-frame body 410 when the sub-panel 420 is positioned in the closed position, thereby maintaining the sub-panel 420 in the closed position. In other words, to move the sub-panel 420 from the closed position to the open position, the latch 450 must be released. Note that when the sub-panel 420 is positioned in the open position and then moved to the closed position, the latch 450 automatically engages.

As shown in Figures 5 to 8, when the face plate portion 421a is positioned in the closed position, the outer circumferential underside of the rectangular tube portion 421b faces the inner trapezoidal fin portion 412c of the sub-lower frame 412, and the upper corner on the exterior side abuts against the sealing member 416 provided on the outer upper abutment fin portion 411c of the sub-upper frame 411. As is clear from the figures, the rectangular tube portion 421b has screw holes 421d at the top and bottom. The screw holes 421d are open at both the left and right ends. The upper screw hole 421d is provided on the inner circumferential underside of the rectangular tube portion 421b, and the lower screw hole 421d is provided on the outer circumferential underside of the rectangular tube portion 421b.

The side panels 422 attached to both end portions of the panel base 421 are symmetrical to each other. In this embodiment, the side panels 422 are composed of a flat side panel base 422a large enough to cover the opening of the rectangular tube portion 421b, and a panel extension 422b that bends outward at a nearly right angle from the edge of the side panel base 422a located on the indoor side.

The side plate base 422a has screw holes (not shown) at locations corresponding to the screw holes 421d in the rectangular tube portion 421b. The side plate 422 is attached to both side ends of the face plate base 421 by threading screws 431 into the screw holes 421d through the screw holes in the side plate base 422a. The face plate extensions 422b are positioned on both sides of the face plate portion 421a as extensions of the face plate portion 421a, and are sized to be able to simultaneously abut against the seal members 418 provided on the inner vertical abutment fin portions 413b of the sub-vertical frame 413.

As is clear from the figure, heat-foaming material (secondary thermally expandable member) C2 is provided around the four periphery between the sub-frame 410 and the secondary panel 420. Heat-foaming material C2 is the same type as heat-foaming material C1 provided on the vertical frames 33 and 34. In this embodiment, as shown in Figures 5 and 7, heat-foaming material C2 is provided on the underside of the upper frame base 411a of the secondary upper frame 411 facing the secondary panel 420, and on the upper side of the inner platform-shaped insert of the secondary lower frame 412 facing the secondary panel 420. Heat-foaming material C2 is also provided on the surface of the face plate extension 422b of the side panel 422 facing the outside. The latch receiver 451 of the latch 450 described above is provided on the underside of the upper frame base 411a of the secondary upper frame 411 facing the secondary panel 420. For this reason, the underside of the upper frame base 411a is provided with heat-foamed material C2 on both sides thereof so as to be divided by the latch receiver 451, and heat-foamed material C2 is also provided on the surface of the latch receiver 451. Furthermore, the heat-foamed material C2 provided on the face plate extension 422b of the side plate 422 can be touched by hand when the secondary face plate 420 is moved to the open position. Therefore, the heat-foamed material C2 on the face plate extension 422b is prevented from peeling off from the face plate extension 422b by the retaining member 460. The retaining member 460 is integrally formed with a flat mounting plate portion 460a and a retaining plate portion 460b bent at a substantially right angle from one edge of the mounting plate portion 460a. The retaining plate portion 460b is attached to the outer surface of the side plate base 422a via the mounting plate portion 460a, with the retaining plate portion 460b abutting against the surface of the heat-foamed material C2. In this embodiment, the retaining member 460 is attached to the side plate base 422a using the screws 431 that attach the side plate 422 to the surface material base 421.

Furthermore, in this ventilation unit 40, a heat-expanding foam material (thermally expandable member) C3 is disposed on the vertical frame base 413a of the sub-vertical frame 413 in a portion facing the storage sections 33a, 34a of the vertical stiles 33, 34, and a heat-expanding foam material C3 is also disposed on the underside of the lower frame base 412a of the sub-bottom frame 412 facing the sub-frame storage section 412d. These heat-expanding foam materials C3 are the same type as the heat-expanding foam material C1 disposed on the vertical stiles 33, 34. As described above, the heat-expanding foam material C1 is disposed along the entire length of the storage sections 33a, 34a of the vertical stiles 33, 34. Therefore, the heat-expanding foam material C1 disposed on the vertical stiles 33, 34 and the heat-expanding foam material C3 disposed on the sub-vertical frame 413 are disposed between the sub-vertical frame 413 and the vertical stiles 33, 34.

In addition, as shown in Figure 2, in this fitting, heated foam material C4 is also placed in the storage section 31a of the upper frame 31, and as shown in Figure 5, heated foam material C5 is also placed together with reinforcing material D in the hollow section 33c of the vertical frame 33, which is the joining position.

With the inner shoji screen 30 configured as described above, when the panel portion 421a of the secondary panel 420 is positioned in the closed position, the seal member 415 of the inner upper abutment fin portion 411b, the seal member 417 of the inner trapezoidal fin portion 412c, and the seal member 418 of the inner vertical abutment fin portion 413b each come into contact with the panel portion 421a. Therefore, when the panel portion 421a is positioned in the closed position, ventilation through the sub-frame body 410 is blocked, and ventilation does not occur through the ventilation unit 40.

On the other hand, when the panel portion 421a is positioned in the open position, the seal member 415 of the inner upper abutment fin portion 411b, the seal member 417 of the inner platform fin portion 412c, and the seal member 418 of the inner vertical abutment fin portion 413b are separated from the panel portion 421a, and the sub-frame body 410 is in an open state. As a result, even when the frame body 10 is closed by the shoji screens 20 and 30, the room can be ventilated via the ventilation unit 40 by releasing the latch 450 and moving the panel portion 421a of the sub-panel member 420 to the open position.

Furthermore, with the above-mentioned fittings, heated foam material C2 is provided on all four sides between the sub-frame body 410 and the secondary surface material 420. Therefore, if the fittings are exposed to high temperatures in the event of a fire, etc., the heated foam material C2 will expand, sealing off the four sides between the sub-frame body 410 and the secondary surface material 420. This means that even if the fittings are exposed to high temperatures, there is no risk of a through hole forming in the ventilation unit 40 that penetrates between the inside and outside of the room.

Furthermore, when the building fixture is exposed to high temperatures, the heated foam material C1 provided in the storage sections 33a, 34a of the vertical frames 33, 34 and the heated foam material C3 provided in the vertical frame base 413a of the sub-vertical frame 413 expand, ensuring that the portions of the storage sections 33a, 34a of the vertical frames 33, 34 facing the sub-vertical frame 413 are securely closed.

Therefore, if the double-glazed glass 35 is exposed to high temperatures and flammable gas is generated from the spacer member S, for example, and the gap between the housing portions 33a, 34a of the vertical frames 33, 34 and the double-glazed glass 35 is not completely sealed, the flammable gas generated from the double-glazed glass 35 will not reach the gap between the vertical frames 33, 34 and the sub-vertical frame 413. In addition, in the above-mentioned fixture, the heated foam material C3 is also disposed in the lower frame base 412a of the sub-bottom frame 412. Therefore, when exposed to high temperatures, the sub-frame housing portion 412d is also sealed, reliably preventing flammable gas from the double-glazed glass 35 from reaching the gap between the vertical frames 33, 34 and the sub-vertical frame 413. This prevents flammable gas from being emitted from the ventilation unit 40 and eliminates the risk of flames breaking out on the unheated surface opposite the heated surface.

While the above-described embodiment exemplifies a sliding window as a fixture, it can also be applied to a casement window, where the shoji screen opens and closes outward from the frame, or to a fixed window, where the shoji screen and panel are fixed to the building material. Furthermore, while the secondary shoji screen is exemplified as a ventilation unit in which the secondary panel is arranged to be openable and closable relative to the sub-frame, this is not necessarily limited to this, and other types of panels may be used as long as they are placed between two building materials. In this case, the secondary panel 420 is not necessarily placed between building materials aligned vertically, but may be placed between building materials aligned horizontally. Furthermore, the secondary panel 420 is illustrated as being formed by attaching side panels 422 to both end portions of the panel base 421, but this is not necessarily limited to this, and double-glazed glass or other materials may also be used. Furthermore, while the panel 35 is exemplified as a panel, this is not necessarily limited to this, and for example, a non-translucent panel may be used as the panel.

In addition, in the above-described embodiment, the heat-expanding foam material C1 is disposed along the entire length of the storage sections 33a, 34a of the vertical frames 33, 34, which is preferable in terms of fire resistance. However, the present invention is not necessarily limited to this, and it is sufficient if the heat-expanding member is disposed only in the section of the building material storage section that faces the secondary building material. In this case, since the above-described embodiment provides the heat-expanding member in the secondary building material, it is possible to use the same building material for inner shoji screens that have secondary shoji screens and inner shoji screens that do not have secondary shoji screens. However, the heat-expanding member may also be attached to the building material.

As described above, the fittings of the present invention are characterized in that a surface material and a secondary shoji screen are placed between two building materials, the surface material is placed between the two building materials with both edge portions accommodated in storage sections provided in the opposing parts of the two building materials, the secondary shoji screen has secondary building materials on both sides and is placed between the two building materials with the secondary building materials engaged with each of the building materials, and a thermally expandable member is arranged in the storage section where the building material and the secondary building material face each other.
According to this invention, when the building material is exposed to high temperatures, the expansion of the thermally expandable member closes the storage space between the building material and the secondary building material. Therefore, even if flammable gas is generated from the surface material, this flammable gas will not reach the secondary screen, eliminating the risk of it catching fire on the unheated side of the secondary screen.

Furthermore, the present invention is characterized in that in the above-mentioned fitting, the thermally expandable member is attached to the secondary building material.
According to this invention, there is no need to install thermal expansion members in building materials, so building materials for fittings with secondary shoji screens can be made common to both fittings with secondary shoji screens and fittings without secondary shoji screens.

Furthermore, the present invention is characterized in that, in the above-mentioned fittings, the secondary shoji screen comprises a secondary frame body made of the secondary building material and a secondary surface material supported on the sub-frame body in a state in which the opening of the sub-frame body is opened and closed, and a secondary thermal expansion member is arranged around the entire periphery between the sub-frame body and the secondary surface material.
According to this invention, when the building fixture is exposed to high temperatures, the secondary thermal expansion member in the secondary shoji screen expands, sealing the gap between the secondary frame body and the secondary panel, thereby preventing the secondary shoji screen from becoming a penetration point for flames.

The present invention is also characterized in that, in the above-mentioned building fixture, the secondary surface material protrudes toward the inside of the room to open the secondary frame body, at least a portion of the secondary thermal expansion member is attached to the secondary surface material, and the secondary thermal expansion member attached to the secondary surface material is covered by a pressing member provided on the secondary surface material.
According to this invention, the secondary thermal expansion member is covered by the pressing member, so there is no risk of the secondary thermal expansion member accidentally falling off.

30 Inner shoji screen, 33, 34 Vertical frame, 33a, 34a Storage section, 35 Double-glazed glass, 40 Ventilation unit, 410 Sub-frame, 413 Sub-vertical frame, 420 Sub-surface material, 460 Pressing member, C2 Heat-foaming material, C3 Heat-foaming material

Claims (3)

A frame body and a shoji screen disposed on the frame body,
The shoji screen is provided with a surface material and a ventilation unit inside a four-sided building material,
The ventilation unit includes a sub-frame body and a sub-surface material supported in an openable and closable manner inside the sub-frame body via a sub-bottom frame constituting the sub-frame body,
a latch is provided between the sub-upper frame and the sub-surface member that constitutes the sub-frame body, for maintaining the sub-surface member in a closed position;
The sub-vertical frame, the sub-upper frame, and the sub-lower frame that constitute the sub-frame body each have an inner fin portion that faces the interior of the room toward the inner periphery, and an inner seal member is attached to the inner fin portion on the surface facing the interior of the room.
The sub-upper frame and the sub-vertical frame each have an outer fin portion toward the inner periphery at a portion that faces the exterior of the room, and an outer seal member is attached to the outer fin portion.
The auxiliary surface material has a face plate portion that contacts the inner seal member from the indoor side when the auxiliary surface material is disposed in the closed position, and a square tube portion that is provided on a visible surface of the face plate portion facing the outdoor side and contacts the outer seal member, and a lower edge portion of the face plate portion is rotatably supported by the auxiliary lower frame,
The inner fin portion of the secondary lower frame has a portion that is located on the inner circumferential side of the rotation support portion of the secondary face material, and the inner seal member is attached to the inner circumferential side portion,
A building fixture characterized in that a thermal expansion member is provided between the sub-frame body and the sub-surface material in a portion that is closer to the outdoor space than the inner sealing member. The fixture according to claim 1, characterized in that the secondary panel has screw holes in the square tube portion. The building fixture described in claim 1, characterized in that the sub-bottom frame is provided with a sub-frame housing portion that houses the upper edge portion of the face material, and a thermal expansion member is provided in the sub-frame housing portion.