Hinged window

Abstract

Provided is a hinged window with improved watertightness in a medium-to-high-rise building.　This hinged window 1 includes a frame body 2, and a sash 300 having a face material G and a frame body 3 for holding the face material. The frame body includes an airtight material 4 provided on an indoor side rising wall 254 and abutting on the frame body in a state where the sash is closed, and forms space parts Y1, Y2 having atmospheric pressure equal to outside atmospheric pressure between the frame body and the sash in a state where the sash is closed. The sash includes face material holding grooves 31G, 33G, 35G, 35G for holding the face material, and an air introduction hole S2 formed in one frame constituting the frame body and communicating with the space parts to introduce air into the face material holding grooves.

Description

Opening window

[0001] The present invention relates to an opening window.

[0002] Conventionally, by forming an air vent hole that connects the inside of the groove portion of the lower frame and the inside of the room, it is possible to prevent water accumulated on the upper side of the lower frame of the sash opening frame from further entering the indoor side due to fluctuations in wind pressure such as typhoons (see Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 10-331545

[0004] By the way, in mid- and high-rise buildings that are easily affected by strong winds, there is a need for joinery with higher waterproof performance than the waterproof structure used in low-rise buildings such as detached houses. In addition to the sliding sash doors, the demand for opening windows that are easy to ventilate while ensuring safety is also increasing in mid- and high-rise floors.

[0005] An object of the present disclosure is to provide an opening window with improved waterproof performance in mid- and high-rise buildings.

[0006] The present disclosure relates to an opening window including a frame body and a shoji having a face material and a frame body that holds the face material. The frame body includes an airtight material provided on an indoor rising wall and abutting against the frame body when the shoji is closed, and forms a space portion having an air pressure equal to the external air pressure between the frame body and the shoji when the shoji is closed. The shoji includes a face material holding groove that holds the face material, and an air introduction hole formed in one of the frames constituting the frame body and communicating with the space portion to introduce air into the face material holding groove.

[0007] This is an elevation view of the casement window according to this disclosure as seen from the outside. This is an elevation view of the casement window according to this disclosure as seen from the inside. This is a perspective view of the casement window according to this disclosure as seen from the inside. This is a longitudinal cross-sectional view of the casement window according to this disclosure. This is an enlarged view of the lower part of the longitudinal cross-sectional view shown in Figure 4. This is a transverse cross-sectional view of the casement window according to this disclosure. This is a diagram showing the arrangement of the air intake hole, fin member and water drain material according to this disclosure. This is a cross-sectional perspective view showing the arrangement of the air intake hole according to this disclosure. This is an exploded perspective view of the handle according to this disclosure. This is a cross-sectional view of the handle according to this disclosure. This is a cross-sectional view showing the handle shown in Figure 10 in a rotated state. This is a longitudinal cross-sectional view showing the arrangement of fire-resistant components according to the second embodiment. This is a transverse cross-sectional view showing the arrangement of fire-resistant components according to the second embodiment. This is a diagram showing the state in which the heat-expandable material shown in Figure 12 has expanded. This is a diagram showing the state in which the heat-expandable material shown in Figure 13 has expanded.

[0008] [First Embodiment] Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. In this specification, "face direction" refers to the surface direction of the shoji screen in a door fitting fitted into an opening formed in a building, and "depth direction" refers to the thickness direction of the shoji screen. In this specification, "inner circumference" as described in "inner circumference direction" and "inner circumference side" refers to the "inner circumference" of the frame 2 of the casement window 1, and similarly, "outer circumference" as described in "outer circumference direction" and "outer circumference side" refers to the "outer circumference" of the frame 2 of the casement window 1.

[0009] In the drawings of this specification, the "outdoor side" is denoted as X1 and the "indoor side" as X2. In this specification, in the casement window 1, the surface located on the X1 side is defined as the outdoor side facing surface, and the surface located on the X2 side is defined as the indoor side facing surface.

[0010] As shown in Figures 1 to 6, the casement window 1 of this embodiment is a sliding window installed in an opening of a building (not shown) and is used in medium- and high-rise buildings. In this disclosure, a medium- and high-rise building is a building with a height of at least 12 m. The casement window 1 has a frame 2 framed on all four sides and a sash 300 that is pushed open in the X1 direction relative to the frame 2. The frame 2 is constructed by framing an upper frame 2a, a lower frame 2b, and vertical frames 2c, 2c arranged in the left-right direction in a substantially rectangular shape.

[0011] The shoji screen 300 comprises a frame 3 and a facing material G. The frame 3 is constructed by framing an upper frame 3a, a lower frame 3b, and vertical frames 3c, 3c arranged in the left-right direction in a substantially rectangular shape. The facing material G is double-glazed glass and is held and fixed to the frame 3. As shown in Figures 4 and 6, a backup material G1 and a sealing material G2 are provided between the facing material G and the inner circumferential surfaces of the facing material holding grooves 31G, 33G, 35G provided in the frame 3. The casement window 1 of this disclosure is not limited to this, and the facing material G may be fixed using glazing beads instead of the backup material G1 and sealing material G2.

[0012] As shown in Figure 4, the upper frame 2a has a metal upper frame 21 and a resin upper frame 22. The metal upper frame 21 is a metal frame made of a profile obtained by extruding a metal such as aluminum, but is not limited to this. The metal upper frame 21 has a frame body portion 211, a first engaged portion 212, a wall portion 213, a second engaged portion 214, and a fitting groove portion 215.

[0013] The frame body portion 211 is a roughly rectangular tubular member with a horizontally elongated cross-section and has an indoor-facing surface 211a. The first engaging portion 212 is formed by bending the end of the indoor-facing surface 211a, which is on the inner circumference side of the frame body portion 211, at a roughly right angle in the X1 direction. The wall portion 213 is a wall portion that protrudes inward from the edge on the inner circumference side of the frame body portion 211 and extends in the longitudinal direction, and constitutes the indoor-facing rising wall of the upper frame 2a.

[0014] The second engaged portion 214 is an engaged portion that protrudes in the X2 direction from the end of the wall portion 213 which is on the inner circumference side of the frame body portion 211. The fitting groove portion 215 is a groove portion that protrudes in the X1 direction, symmetrical to the second engaged portion 214, and is provided extending in the longitudinal direction of the wall portion 213. The fitting groove portion 215 is provided with an airtight material 4, which will be described later.

[0015] The resin upper frame 22 is a resin frame formed from a resin material having heat insulating properties, and is provided at the corner of the metal upper frame 21 on the X2 side than the wall portion 213. The resin upper frame 22 has a frame body portion 221, a first engaging portion 222, a second engaging portion 223, an outdoor side protrusion 224, and an indoor side protrusion 225. The first engaging portion 222 has a projection that protrudes upward and engages with the first engaged portion 212 of the metal upper frame 21. The second engaging portion 223 has a projection that protrudes in the X1 direction and extends upward and engages with the second engaged portion 214 of the metal upper frame 21.

[0016] The outdoor projection 224 is provided projecting in the X1 direction from the lower end of the frame body 221 on the X1 side, and is made of a resin that is softer than the other members of the resin upper frame 22. The indoor projection 225 projects in the X2 direction from the frame body 221 and is fixed so as to be substantially flush with the dashed line WF which indicates the inner circumferential surface of the window frame (not shown). This configuration makes it possible to suppress heat transfer in the depth direction and the width direction of the upper frame 2a, and improve the thermal insulation of the casement window 1.

[0017] The upper frame 3a comprises a metal upper frame 31 and a resin upper frame 32. The metal upper frame 31 is a metal frame made of a profile obtained by extruding a metal such as aluminum, but is not limited to this. The metal upper frame 31 comprises a first metal frame 31A and a second metal frame 31B. The first metal frame 31A comprises a groove bottom surface portion 311, an outdoor side groove side portion 312, an outdoor visible surface portion 313, an upper surface portion 314, an indoor protruding portion 315, and an indoor visible surface portion 316. The second metal frame 31B comprises an indoor groove side portion 317 and an upper surface portion 318.

[0018] The indoor-facing projection 315 of the first metal frame 31A has a first engaging portion 315a formed extending in the circumferential direction from the X1 side end, and a second engaging portion 315b formed extending in the circumferential direction from approximately the center in the depth direction. The upper surface portion 318 of the second metal frame 31B has a first engaged portion 318a formed extending outward from the X1 side end, a second engaged portion 318b formed extending outward from approximately the center in the depth direction, and a third engaged portion 318c extending in the X2 direction.

[0019] The first engaged portion 318a of the second metal frame 31B engages with the first engaged portion 315a of the first metal frame 31A, and the second engaged portion 318b of the second metal frame 31B engages with the second engaged portion 315b of the first metal frame 31A, thereby forming the upper metal frame 31. With this configuration, the groove bottom portion 311 and the outdoor side groove portion 312 of the first metal frame 31A, and the indoor side groove portion 317 of the second metal frame 31B form a substantially C-shaped surface material holding groove 31G into which the upper edge of the surface material G is fitted.

[0020] An engaging portion 317a protruding in the X2 direction is formed at the inner circumference end of the indoor groove side portion 317. The outdoor visible surface portion 313 extends upward from the X1 side end of the groove bottom surface portion 311 and has a water drain material 5 at its tip. The water drain material 5 is made of natural rubber or synthetic rubber, and is a long, strip-shaped member with elasticity, airtightness, and watertightness, and is provided over substantially the entire length in the longitudinal direction of the upper frame 3a.

[0021] As shown in Figure 7, the flashing material 5 is continuously installed to seal the gap between the frame 2 and the shoji screen 300, excluding the lower frame 2b and lower stile 3b. When the shoji screen 300 is closed, the flashing material 5 abuts against the metal upper frame 21 of the upper frame 2a. With this configuration, when the shoji screen 300 is closed, the flashing material 5 seals the gap between the metal upper stile 31 and the metal upper frame 21, preventing outside air and rainwater from entering from the X1 side to the X2 side.

[0022] The resin upper frame 32 is a resin frame formed from a resin material having heat insulating properties, and is provided exposed on the X2 side so as to cover the metal upper frame 31. The resin upper frame 32 has a projection surface portion 321 and a visible surface portion 322. An engaging portion 321a protruding in the outer peripheral direction is formed at the X1 side end of the projection surface portion 321. An engaging portion 322a is formed at the outer peripheral end of the visible surface portion 322, which bends and extends in the X1 direction.

[0023] The engaged portion 317a of the metal upper frame 31 engages with the engaged portion 321a of the resin upper frame 32, and the third engaged portion 318c of the metal upper frame 31 engages with the engaged portion 322a of the resin upper frame 32, thereby fixing the resin upper frame 32 and the metal upper frame 31 together. The resin upper frame 32 is an inner trim that holds down the facing material G, and the facing material G can be installed from the X2 side. With this configuration, heat transfer in the depth direction and the width direction of the upper frame 3a can be suppressed, and the thermal insulation of the casement window 1 can be improved.

[0024] Furthermore, when the shoji screen 300 is closed, the outdoor-facing projection 224 of the resin upper frame 22 abuts against the visible surface 322 of the resin upper frame 32, so that the resin upper frame 22 and the resin upper frame 32 are arranged continuously adjacent to each other, covering the metal upper frame 21 and the metal upper frame 31. With this configuration, heat transfer in the depth direction and the visible direction of the upper frame 3a can be suppressed more efficiently, and the thermal insulation performance of the casement window 1 can be further improved.

[0025] Furthermore, in addition to thermal insulation, the exposed resin frame and resin stile on the X2 side improves the aesthetic appeal of the casement window 1. The ability to freely arrange the color and texture of the resin components brings a greater sense of unity to the interior decoration than metal components, and also improves the aesthetic appeal of the indoor space in which the casement window 1 is installed. A space Y2 is formed between the upper frame 2a and the upper stile 3a, which communicates with the space Y1 described later.

[0026] The airtight material 4 is a long, strip-shaped member made of natural rubber or synthetic rubber, possessing elasticity, airtightness, and watertightness, and is provided over substantially the entire length in the longitudinal direction of the upper frame 2a. The airtight material 4 is provided in the fitting groove portion 215 of the metal upper frame 21 and is positioned to protrude in the X1 direction. With this configuration, when the shoji screen 300 is closed, the airtight material 4 abuts against the indoor-facing surface portion 316 of the metal upper frame 31, thereby suppressing the outflow of air introduced from the X1 side from the space Y2 to the X2 side.

[0027] As shown in Figures 4 and 5, the lower frame 2b has a metal lower frame 23 and a resin lower frame 24. The metal lower frame 23 is a metal frame made of a profile obtained by extruding a metal such as aluminum, but is not limited to this. The metal lower frame 23 includes a lower plate portion 231, a middle plate portion 232, an upper plate portion 233, an indoor side plate portion 234, a first wall portion 235, a second wall portion 236, an outdoor side plate portion 237, a water drain fixing piece 238, and an indoor rising wall 20 made of a part of the metal lower frame 23.

[0028] The indoor side panel 234 is a visible surface provided at the end on the X2 side. At the upper end of the indoor side panel 234, an engaged portion 234a is formed, which protrudes in the X2 direction and extends upward, into which the resin lower frame 24 engages. The middle panel 232 is provided to connect the X1 side surface of the indoor side panel 234 and the lower end of the first wall portion 235.

[0029] The first wall portion 235 is a wall portion that protrudes in the circumferential direction from the middle of the depth direction on the inner circumferential surface of the middle plate portion 232 and extends in the longitudinal direction. The first wall portion 235 constitutes the indoor rising wall of the lower frame 2b. The upper end of the first wall portion 235 on the X1 side has a fitting groove portion 235a that opens in the direction of X1. An airtight material 4 is provided in the fitting groove portion 235a. An engaging portion 235b that bends in the direction of X2 is provided at the upper part of the fitting groove portion 235a.

[0030] The lower plate portion 231 is provided projecting downward from the middle plate portion 232 and bending in the X1 direction. The outdoor side plate portion 237 is a visible surface extending downward from the X1 side end of the lower plate portion 231. The water drain fixing piece 238 extends in the X2 direction from the lower end of the outdoor side plate portion 237 and is formed by bending downward.

[0031] The second wall portion 236 is a wall portion that protrudes in the circumferential direction from the middle of the depth direction on the inner circumferential surface of the lower plate portion 231 and extends in the longitudinal direction. The second wall portion 236 is provided on the X1 side of the first wall portion 235 and has an extended piece 236a that is formed by bending at approximately a right angle in the X2 direction.

[0032] The indoor rising wall 20 comprises a middle plate portion 232, an upper plate portion 233, an indoor plate portion 234, and a first wall portion 235, and is a wall portion erected on the X2 side of the lower frame 2b. The first wall portion 235 is the outdoor side portion of the indoor rising wall 20, and the airflow toward the X2 side is blocked by the airtight material 4 provided on the first wall portion 235.

[0033] The resin lower frame 24 is a resin frame formed from a resin material having heat insulating properties, and is provided at the corner of the metal lower frame 23 on the X2 side of the first wall portion 235. The resin lower frame 24 is provided above the indoor rising wall 20 of the metal lower frame 23. The resin lower frame 24 has an upper plate portion 241, an outer peripheral projection portion 242, an engaging portion 243, and an outdoor side projection portion 244. The upper plate portion 241 forms the inner peripheral surface of the frame body 2 and is fixed so as to be substantially flush with the dashed line WF which represents the inner peripheral surface of a window frame (not shown).

[0034] An engaging portion 241a is formed at the X1-side end of the upper plate portion 241, protruding outward, and engages with the engaging portion 235b of the metal lower frame 23. Further towards X1 from the engaging portion 241a, an outdoor-side protrusion 244 is provided, which protrudes further in the X1 direction than the upper plate portion 241. The outdoor-side protrusion 244 is made of a resin that is softer than the other members of the resin lower frame 24. The upper plate portion 241 protrudes in the X2 direction and is fixed so as to be substantially flush with the dashed line WF, which indicates the inner circumferential surface of a window frame (not shown).

[0035] The outer peripheral projection 242 protrudes outward from the outer peripheral surface of the upper plate portion 241 and extends in the longitudinal direction. The engaging portion 243 is a projection that protrudes outward from the outer peripheral surface of the upper plate portion 241 and engages with the engaged portion 234a of the metal lower frame 23. The engaging portion 243 is provided on the X1 side of the outer peripheral projection 242. This configuration makes it possible to suppress heat transfer in the depth direction and the visibility direction of the lower frame 2b, thereby improving the thermal insulation of the casement window 1.

[0036] The lower frame 3b has a metal lower frame 33 and a resin lower frame 34, and includes an overhang 30 formed from a part of the metal lower frame 33 and the resin lower frame 34. The metal lower frame 33 is a metal frame made of a profile obtained by extruding a metal such as aluminum, but is not limited to this. The metal lower frame 33 has a first metal frame 33A arranged on the X1 side and a second metal frame 33B arranged on the X2 side. The first metal frame 33A has a first bottom surface portion 331, an outdoor gutter side surface portion 332, an outdoor facing surface portion 333, a first connecting portion 334, and a lower surface portion 335.

[0037] The second metal frame 33B has a second bottom portion 336, an indoor rising portion 337, an upper portion 338, an indoor facing portion 339, a second connecting portion 3310, and a lower portion 3311. The first connecting portion 334 of the first metal frame 33A and the second connecting portion 3310 of the second metal frame 33B are connected by a resin bridge material B that has heat insulating properties.

[0038] With this configuration, the first bottom surface 331 and the outdoor side gutter side surface 332 of the first metal frame 33A, and the second bottom surface 336 and the indoor rising surface 337 of the second metal frame 33B form a roughly C-shaped surface material holding groove 33G in which the end of the surface material G abuts against and is held by the first bottom surface 331 and the second bottom surface 336 via the setting block T.

[0039] The outdoor-facing surface portion 333 extends downward from the X1-side end of the first bottom surface portion 331. The outdoor-facing surface portion 333 has a fitting groove portion 333a on the indoor-side surface portion at its outer peripheral end, and is equipped with a fin member 6 that protrudes from the fitting groove portion 333a in the X2 direction. The fin member 6 is a long, strip-shaped member made of natural rubber or synthetic rubber, and is elastic, airtight, and watertight.

[0040] As shown in Figures 4 and 5, when the shoji screen 300 is closed, the fin member 6 abuts against the metal lower frame 23 of the lower frame 3b. As shown in Figure 3, the lower frame 3b is provided with a handle 7 and a sub-lock 8, which will be described later. This creates a problem in that external noise easily leaks into the interior through the openings for attaching these components.

[0041] However, if the space between the lower frame 2b and the lower stile 3b is sealed for soundproofing, it becomes difficult to create a space in the casement window 1 installed in a mid- or high-rise building that has a watertight, isobaric structure that maintains the same atmospheric pressure inside the stile 3 as the outside air pressure, thereby preventing rainwater from outside from being drawn into the building.

[0042] As shown in Figure 7, the fin member 6 is provided extending in the longitudinal direction, forming gaps S1 at both ends in the longitudinal direction of the lower frame 3b for introducing outside air (air E). With this configuration, a gap S1 is formed between the lower frame 2b and the lower frame 3b to introduce air E and create a space Y1 with an isobaric structure, while the fin member 6 provides a sound insulation effect that suppresses external noise. As a result, the casement window 1 can be improved not only in watertightness but also in sound insulation, and can exhibit high functionality even in medium- and high-rise buildings.

[0043] Furthermore, the configuration of the fin member 6 is not limited to this embodiment. The fin member 6 may be provided not only on the lower frame 3b, but also on one of the frames constituting the frame body 3. Also, the gap S1 may be formed not only at both ends in the longitudinal direction of one frame, but also at multiple locations spaced apart, for example, approximately in the center in the longitudinal direction of the fin member 6.

[0044] As shown in FIG. 5, the first metal frame 33A includes an air introduction hole S2 that communicates with the space portion Y1 and introduces air into the face material holding groove 33G. The air introduction hole S2 includes a first air introduction hole S21 and a second air introduction hole S22. The first air introduction hole S21 is formed in the first bottom surface portion 331, and the second air introduction hole S22 is formed in the lower surface portion 335.

[0045] The second air introduction hole S22 is provided below the first air introduction hole S21 and is formed with a displacement in the vertical direction. Further, as shown in FIGS. 7 and 8, the first air introduction hole S21 and the second air introduction hole S22 are also formed with a displacement in the longitudinal direction.

[0046] With this configuration, it is easy to take in outside air (air E) from the X1 side, and when rainwater outdoors is drawn into the room, the first air introduction hole S21 and the second air introduction hole S22 are formed with a displacement in at least one of the vertical direction and the horizontal direction, so that it is possible to suppress rainwater from entering the inside of the housing 3.

[0047] The configuration of the air introduction hole S2 is not limited to this embodiment, and an air introduction hole S2 may be provided in one frame constituting the housing 3. Further, the positions of the first air introduction hole S21 and the second air introduction hole S22 may be formed with a displacement in at least one of the vertical direction and the horizontal direction. Further, the air introduction hole S2 does not necessarily include the first air introduction hole and the second air introduction hole, and may have at least one air introduction hole.

[0048] The second bottom surface portion 336 of the second metal frame 33B and the indoor side rising portion 337 are integrally formed, and an upper surface portion 338 is provided so as to connect the indoor side finding surface portion 339 and the indoor side rising portion 337. The indoor side rising portion 337 has a protruding portion 337a protruding in the X2 direction, and the indoor side finding surface portion 339 has a protruding portion 339a protruding in the X1 direction at the inner peripheral side tip portion. A handle 7 described later is attached to the upper surface portion 338.

[0049] The overhang portion 30 comprises the indoor-facing rising portion 337, the upper portion 338, and the indoor-facing visible portion 339 of the metal lower frame 33, and a resin lower frame 34 provided above the overhang portion 30. The overhang portion 30 is provided on the lower frame 3b, extending inward from the surface material holding groove 33G, and a handle 7 for operating the shoji screen 300 is fixed to it. For this reason, the overhang portion 30, which is made of a composite material of metal and resin, has flexibility to withstand frequent operation of the handle 7, as well as strength and durability against pressure during operation.

[0050] In the panel material holding groove 33G, the second bottom portion 336 and the indoor-side rising portion 337 of the overhang portion 30 are integrally molded, thereby improving the durability not only of the overhang portion 30 but also of the panel material holding groove 33G, and ensuring that the end of the panel material G is securely held. Furthermore, this configuration improves the overall strength and durability of the metal lower frame 33 to which the handle 7 is attached.

[0051] The resin frame 34 is a resin frame formed from a resin material having heat insulating properties, and is provided exposed on the X2 side so as to cover the metal frame 33. The resin frame 34 has a visible surface portion 341 and a visible surface portion 342. A first engaging portion 341a protruding in the outer direction is formed at the X1 side end of the visible surface portion 341, and a second engaging portion 341b protruding in the outer direction is formed at the X2 side end. A handle 7 and a sub-lock 8, which will be described later, are arranged on the upper surface of the visible surface portion 341.

[0052] The projection 337a of the metal bottom frame 33 engages with the first engaging portion 341a of the resin bottom frame 34, and the projection 339a of the metal bottom frame 33 engages with the second engaging portion 341b of the resin bottom frame 34, thereby fixing the resin bottom frame 34 and the metal bottom frame 33 together. This configuration and the configuration of the metal bottom frame 33 connected by the bridge material B make it possible to suppress heat transfer in the depth direction and the face direction of the bottom frame 3b, thereby improving the thermal insulation of the casement window 1.

[0053] Furthermore, when the shoji screen 300 is closed, the outdoor-facing projection 244 of the resin lower frame 24 abuts against the visible surface 342 of the resin lower stile 34, so that the resin lower frame 24 and the resin lower stile 34 are arranged continuously adjacent to each other, covering the metal lower frame 23 and the metal lower stile 33. With this configuration, heat transfer in the depth direction and the visible direction of the lower stile 3b can be suppressed more efficiently, and the thermal insulation performance of the casement window 1 can be further improved.

[0054] Furthermore, in addition to thermal insulation, the exposed resin frame and resin stile on the X2 side improves the aesthetic appeal of the casement window 1. The ability to freely arrange the color and texture of the resin components brings a greater sense of unity to the interior decoration than metal components, and also improves the aesthetic appeal of the indoor space in which the casement window 1 is installed.

[0055] The airtight seal 4 is provided along approximately the entire length of the lower frame 2b. The airtight seal 4 is provided in the fitting groove 235a of the metal lower frame 23 and is positioned to protrude in the X1 direction. With this configuration, when the sash 300 is closed, the airtight seal 4 abuts against the indoor-facing surface 339 of the protruding portion 30, thereby suppressing the outflow of air introduced from the X1 side from the space Y1 to the X2 side.

[0056] The handle 7 is an operating component for opening and closing the sliding door 300 by pushing it open in the X1 direction when rotated. The handle 7 is a cremone handle that can be locked and unlocked by a rod shaft (not shown), but the handle in this embodiment is not limited to this. For example, a cam latch handle may also be used, and the type of handle to be attached to the casement window is not limited. As shown in Figure 9, the handle 7 has an operating part 71, a cover 72, a gap-filling material 73, a flexible member 74, and a base 75.

[0057] As shown in Figures 9 to 11, the operating part 71 protrudes from inside the lower frame 3b and is provided so that the sliding door 300 can be opened and closed by rotating it in the direction of arrow OP. The cover 72 is made of a resin material with heat insulating properties and is provided on the visible surface portion 341 of the resin lower frame 34. In addition, airtight parts AT, AT are provided inside the lower frame 3b to improve the airtightness of the rod shaft (not shown). The airtight parts AT may be sealers molded from foamed rubber sponge or the like.

[0058] This configuration suppresses air leakage from the metal bottom frame 23 and the metal bottom stile 33, thereby suppressing condensation on the handle 7. Furthermore, by connecting the first metal stile 33A and the second metal stile 33B with the bridge material B, the thermal insulation performance of the metal bottom stile 33 can be improved, thereby enhancing the condensation suppression effect.

[0059] The gap-sealing member 73 moves in accordance with the rotational operation of the operating unit 71 and is a member for sealing the opening provided in the cover 72. The flexible member 74 is provided in the gap between the cover 72 and the base 75 and is an adjustment member for sealing the gap between the gap-sealing member 73 and the operating unit 71. As shown in Figures 10 and 11, the flexible member 74 deforms flexibly so that it can reliably seal the gap between the gap-sealing member 73, which moves in accordance with the operating unit 71, and the operating unit 71.

[0060] The base 75 is made of metal and is fitted into the opening 341c provided in the resin lower frame 34. The rotating shaft of the operating unit 71 is attached to the lower part of the base 75, and the sliding door 300 can be opened and closed, as well as locked and unlocked, by rotating the operating unit 71. With this configuration, air leakage from the opening 341c is blocked, and even when the operating unit 71 is rotated, the deformation of the gap-sealing material 73 reliably suppresses air leakage from the lower frame 3b.

[0061] Furthermore, the handle 7 of this embodiment may be mounted symmetrically with respect to the rotation direction of the operating part 71, and the mounting position of the handle 7 may be any position along the longitudinal direction of the lower frame 3b. Also, the handle 7 of this disclosure does not need to include a cover 72, a gap-filling material 73, and a soft member 74. Furthermore, the casement window 1 of this disclosure may be a vertical sliding window, in which case the handle 7 may be provided on one of the vertical frames 3c, 3c arranged in the left-right direction. In addition, an operator handle may be used for the handle provided on the vertical sliding window.

[0062] As shown in Figure 3, the sub-lock 8 is positioned on the upper surface of the visible surface portion 341 of the resin lower frame 34, but the disclosure is not limited thereto. For example, the sub-lock 8 may be provided on one of the vertical frames 3c, 3c, or the sliding window 300 may not have a sub-lock 8. The sub-lock 8 is a functional component installed to enhance security by assisting in preventing the opening and closing of the sliding window 300. The sub-lock 8 is molded from a resin material with heat insulating properties, and the sliding window 300 can be locked and unlocked by sliding its convex operating part.

[0063] As shown in Figure 6, the vertical frames 2c, 2c are provided symmetrically as a pair on the left and right, so the left and right vertical frames are given common reference numerals and will be described in detail below as having a common shape on both sides. The vertical frame 2c has a metal vertical frame 25 and a resin vertical frame 26. The metal vertical frame 25 is a metal frame made of a profile obtained by extruding a metal such as aluminum, but is not limited to this. The metal vertical frame 25 has a first metal frame 25A and a second metal frame 25B.

[0064] The first metal frame 25A has a side plate portion 251, an indoor plate portion 252, an outdoor plate portion 253, and a first wall portion 254. The indoor plate portion 252 is provided at the indoor end of the first metal frame 25A, and the outdoor plate portion 253 is provided at the outdoor end of the first metal frame 25A. An engaging portion 252a protruding in the X1 direction is formed at the inner circumferential end of the indoor plate portion 252. The side plate portion 251 is provided so as to connect the indoor plate portion 252 and the outdoor plate portion 253. The side plate portion 251 has an engaging portion 251a that protrudes in the inner circumferential direction from the inner circumferential surface and bends in the X2 direction.

[0065] The first wall portion 254 is formed projecting inward from the middle of the side plate portion 251 toward the inner circumference of the frame 2, and constitutes the indoor rising wall of the vertical frame 2c. The first wall portion 254 has a first engaging portion 254a and a third engaging portion 254c on the indoor facing surface, and a second engaging portion 254b and a fitting groove portion 254d on the outdoor facing surface. The first engaging portion 254a is provided at the outer peripheral end of the first wall portion 254, and the third engaging portion 254c and the fitting groove portion 254d are provided at the tip of the first wall portion 254, respectively. An airtight material 4 is provided in the fitting groove portion 254d.

[0066] The second metal frame 25B is positioned on the inner circumference side of the frame body 2 than the first metal frame 25A. The second metal frame 25B is attached and fixed to the side plate portion 251 and the first wall portion 254 of the first metal frame 25A. The second metal frame 25B has an outer plate portion 255, an inner plate portion 256, and a second wall portion 257. The outer plate portion 255 is positioned on the outdoor side of the second metal frame 25B and has a concave engagement groove portion 255a at its outdoor-facing end.

[0067] The inner plate portion 256 is spaced further inward than the side plate portion 251 of the first metal frame 25A and is arranged substantially parallel to the side plate portion 251. The inner plate portion 256 has a projection 256a that protrudes in the X2 direction. The second wall portion 257 is spaced further inward than the first wall portion 254 of the first metal frame 25A and is arranged substantially parallel to the first wall portion 254.

[0068] The second wall portion 257 has a projection 257a and an engaging portion 257b. The projection 257a is formed to protrude in the X2 direction so as to face the projection 256a of the inner plate portion 256. The engaging portion 257b is provided at the inner circumferential tip of the second wall portion 257. The engaging groove 255a of the second metal frame 25B engages with the engaging portion 251a of the first metal frame 25A, and the second engaged portion 254b of the first metal frame 25A engages with the engaging portion 257b of the second metal frame 25B, thereby fixing the second metal frame 25B to the first metal frame 25A.

[0069] The resin vertical frame 26 is a resin frame formed from a resin material having heat insulating properties, and is provided at the corner on the X2 side of the first wall portion 254 of the metal vertical frame 25. The resin vertical frame 26 has a frame body portion 261, an indoor side projection portion 262, an outdoor side projection portion 263, a visible surface portion 264, and a depth surface portion 265.

[0070] The frame body portion 261 is positioned on the outer periphery side of the dashed line WF, which indicates the inner circumferential surface of a window frame (not shown). The frame body portion 261 has a first engaging portion 261a and a second engaging portion 261b that protrude outward from the frame body 2. The first engaging portion 261a engages with the engaged portion 252a of the first metal frame 25A, and the second engaging portion 261b engages with the first engaged portion 254a of the first metal frame 25A. The indoor side protruding portion 262 protrudes from the frame body portion 261 in the X2 direction and is fixed so as to be substantially flush with the dashed line WF.

[0071] The outdoor-side projection 263 is provided projecting from the X1-side tip of the visible surface portion 265. The outdoor-side projection 263 is made of a resin that is softer than the other components of the resin vertical frame 26. The visible surface portion 264 has a third engaging portion 264a that extends in the X1 direction from approximately the center in the width direction. The third engaging portion 264a engages with the third engaged portion 254c of the first metal frame 25A. This configuration makes it possible to suppress heat transfer in the visible and hidden directions of the vertical frame 2c, thereby improving the thermal insulation of the casement window 1.

[0072] The vertical frame 3c has a metal vertical frame 35 and a resin vertical frame 36. The metal vertical frame 35 is a metal frame made of a profile obtained by extruding a metal such as aluminum, but is not limited to this. The metal vertical frame 35 has a first metal frame 35A and a second metal frame 35B. The first metal frame 35A has a groove bottom surface portion 351, an outdoor side groove side portion 352, an outdoor visible surface portion 353, an upper surface portion 354, an indoor protruding portion 355, and an indoor visible surface portion 356. The second metal frame 35B has an indoor groove side portion 357 and a visible surface portion 358.

[0073] The indoor projection 355 of the first metal frame 35A has a first engaging portion 355a formed extending inward from the X1 side end, and a second engaging portion 355b formed extending inward from approximately the center in the depth direction. The depth surface portion 358 of the second metal frame 35B has a first engaged portion 358a formed extending outward from the X1 side end, a second engaged portion 358b formed extending outward from approximately the center in the depth direction, and a third engaged portion 358c extending in the X2 direction.

[0074] The first engaged portion 358a of the second metal frame 35B engages with the first engaged portion 355a of the first metal frame 35A, and the second engaged portion 358b of the second metal frame 35B engages with the second engaged portion 355b of the first metal frame 35A, thereby forming the upper metal frame 31. With this configuration, the groove bottom portion 351 and the outdoor side groove portion 352 of the first metal frame 35A, and the indoor side groove portion 37 of the second metal frame 35B form a substantially C-shaped surface material holding groove 35G into which the upper edge of the surface material G is fitted.

[0075] An engaging portion 357a protruding in the X2 direction is formed at the inner circumference end of the indoor groove side portion 357. The outdoor visible surface portion 353 extends outward from the X1 side end of the groove bottom surface portion 351 and has a drip edge material 5 at its tip. As shown in Figure 7, the drip edge material 5 is provided over substantially the entire length in the longitudinal direction of the vertical frame 3c and is provided continuously to close the gap between the frame body 2 and the sliding door 300, excluding the lower frame 2b and the lower stile 3b.

[0076] A connecting component 9, which is composed of a sliding arm, is provided between the vertical frame 2c and the vertical stile 3c, and the sash 300 is fixed so that it can be opened and closed in the X1 direction by operating the handle 7. The configuration of the connecting component 9 in this disclosure is not limited to this, and for example, if the casement window 1 is a vertical sliding window, the connecting component 9 can be provided between the upper frame 2a and the lower frame 2b and the upper stile 3a and the lower stile 3b.

[0077] When the shoji screen 300 is closed, the water drain material 5 comes into contact with the metal vertical frame 25 of the vertical frame 2c. With this configuration, when the shoji screen 300 is closed, the water drain material 5 seals the gap between the metal vertical frame 35 and the metal vertical frame 25, preventing outside air and rainwater from entering from the X1 side to the X2 side.

[0078] The resin vertical frame 36 is a resin frame formed from a resin material having heat insulating properties, and is provided exposed on the X2 side so as to cover the metal vertical frame 35. The resin vertical frame 36 has a visible surface portion 361 and a visible surface portion 362. An engaging portion 361a protruding in the outer circumferential direction is formed at the X1 side end of the visible surface portion 361. An engaging portion 362a is formed at the outer circumferential end of the visible surface portion 362, which is bent and extends in the X1 direction.

[0079] The engaged portion 357a of the metal vertical frame 35 engages with the engaged portion 361a of the resin vertical frame 36, and the third engaged portion 358c of the metal vertical frame 35 engages with the engaged portion 362a of the resin vertical frame 36, thereby fixing the resin vertical frame 36 and the metal vertical frame 35 together. The resin vertical frame 36 is an inner trim that holds down the facing material G, and the facing material G can be installed from the X2 side. With this configuration, heat transfer in the depth direction and the width direction of the vertical frame 3c can be suppressed, and the thermal insulation of the casement window 1 can be improved.

[0080] Furthermore, when the shoji screen 300 is closed, the outdoor-facing projection 263 of the resin vertical frame 26 abuts against the visible surface 362 of the resin vertical stile 36, so that the resin vertical frame 26 and the resin vertical stile 36 are arranged in a continuous manner so as to overlap, and can cover the metal vertical frame 25 and the metal vertical stile 35. With this configuration, heat transfer in the depth direction and the visible direction of the vertical stile 3c can be suppressed more efficiently, and the thermal insulation performance of the casement window 1 can be further improved.

[0081] Furthermore, in addition to thermal insulation, the exposed resin frame and resin stile on the X2 side improves the aesthetic appeal of the casement window 1. The ability to freely arrange the color and texture of the resin components brings a greater sense of unity to the interior decoration than metal components, and also improves the aesthetic appeal of the indoor space in which the casement window 1 is installed. A space Y2 is formed between the vertical frame 2c and the vertical stile 3c, which communicates with the space Y1.

[0082] The airtight seal 4 is provided along approximately the entire length of the vertical frame 2c. The airtight seal 4 is provided in the fitting groove 254d of the metal vertical frame 25 and is positioned to protrude in the X1 direction. With this configuration, when the shoji screen 300 is closed, the airtight seal 4 abuts against the indoor-facing surface 356 of the metal vertical frame 35, thereby suppressing the outflow of air introduced from the X1 side from the space Y2 to the X2 side.

[0083] Space Y2 is formed in three locations: between the upper frame 2a and the upper stile 3a, and between the vertical frames 2c, 2c and the vertical stiles 3c, 3c. Space Y1 is formed between the lower frame 2b and the lower stile 3b. Spaces Y1 and Y2 are in communication with each other, and the air E introduced in space Y1 fills space Y2 as well, making the internal spaces of space Y1 and Y2 of the frame body 3 equal in pressure to the outside air, thereby suppressing the inflow of rainwater from outdoors into the building.

[0084] With the shoji screen 300 closed, the spaces Y1 and Y2 are enclosed by the frame 2, shoji screen 300, airtight material 4, water drain material 5, and fin member 6, thereby forming an independent space shielded from the outside. With this configuration, by introducing outside air (air E) through a gap S1 formed in a part of the longitudinal direction of the fin member 6, the spaces Y1 and Y2 can be maintained as isobaric spaces with the same pressure as the outside air, thereby creating an opening window 1 with excellent wind pressure resistance and improved watertightness.

[0085] As shown in Figure 5, the air E introduced from the first air inlet S21 of the lower frame 3b fills the space between the panel material holding groove 33G and the panel material G, forming a space Y3 which is an isobaric structure with an atmospheric pressure equal to the outside air pressure. As shown in Figure 6, the space Y3 connects the panel material holding groove 35G formed in the vertical frame 3c and the panel material G, and as shown in Figure 4, a space Y3 is also formed between the panel material holding groove 31G formed in the upper frame 3a and the panel material G.

[0086] This configuration prevents rainwater from entering the building through the gaps between the backup material G1 and the sealing material G2 and the facing material G, thereby improving the watertightness of the casement window 1.

[0087] Furthermore, since the surface material holding grooves 31G, 33G, and 35G are metal components that constitute the metal frame, the airtightness and watertightness of the casement window 1 can be improved compared to the case where the surface material holding grooves are made of resin. By not using resin components in the surface material holding grooves of the casement window 1, there is no need to use resin components to stop water leakage, thus enabling the construction of a casement window 1 with superior airtightness and watertightness.

[0088] The casement window 1 of this embodiment, as described above, comprises a metal frame and metal stile constituting the outdoor portion, and a resin frame and resin stile constituting the indoor portion. Since the outdoor portion is made of a highly durable metal material, the wind pressure resistance performance of the casement window 1 can be improved, and since the indoor portion is made of a resin material, the aesthetic appearance and heat insulation can be improved. In addition, by providing an air intake hole S2, the watertightness of the casement window 1 can be improved.

[0089] This disclosure is not limited to the embodiments described above and may be modified as appropriate.

[0090] The casement window 1 of this disclosure is not limited to a horizontal sliding window. It may be any type of casement window provided in an opening of a building, and may be applied to other casement windows such as vertical sliding windows, projecting windows, and tilting windows. Furthermore, the casement window 1 of this disclosure may have a composite material composed of a metal frame and a resin frame in at least a part of the frame 2 and the stile 3.

[0091] Furthermore, in this embodiment, the upper frame 3a and vertical frames 3c, 3c have a batten structure with an inner batten, but the batten structure of this disclosure is not limited to an inner batten. For example, it may be an outer batten that holds down the surface material G from the X1 side. Also, the batten only needs to be present on at least one frame that forms the frame body 3. In addition, the surface material holding groove 33G provided in the lower frame 3b may be formed with a batten structure, in which case an outer batten is preferred.

[0092] Furthermore, although the facing material G in this embodiment is double-glazed glass, it may also be single-pane glass or double-glazed glass made by combining three or more panes of glass. In addition to glass, the facing material may also be made of panels or plate materials. For example, the sash 300 may be made of a resin panel or an aluminum-resin composite panel (such as Alpolic®).

[0093] [Second Embodiment] Next, a second embodiment of the present disclosure will be described in detail with reference to the drawings. The difference between the second embodiment and the first embodiment is that a heat-expandable material is provided in the metal frame of the frame body 2 and the metal frame of the frame body 3, making it a fire-resistant sash that prevents the spread of fire in the event of a fire. The other components are the same as those of the first embodiment, so their description will be omitted.

[0094] As shown in Figure 12, the opening window 1 is provided with a long fire-resistant component extending in the longitudinal direction: a heat-expanded foaming material F, a low-temperature foamed heat-expanded foaming material LF, and an opening stopper member DS. The heat-expanded foaming material F is made of, for example, foamed PVC. The low-temperature foamed heat-expanded foaming material LF has a lower foaming temperature compared to the ordinary heat-expanded foaming material F, and for example, a low-temperature expansion type epoxy-based material is used.

[0095] The low-temperature foaming heat-expanding material LF is placed at the bottom of the casement window 1, where the temperature is less likely to rise during a fire. This configuration allows for the prevention of fire spread without delay in foaming timing, even at the bottom frame 2b and bottom rail 3b of the casement window 1. The opening stopper member DS is provided to prevent the sash 300 from falling out of the frame 2.

[0096] The metal upper frame 21 of the upper frame 2a has a heat-expanded foaming material F1 and an opening stopper member DS1. The heat-expanded foaming material F1 is fixed by crimping to a projection provided on the wall portion 213 of the frame body portion 211 and to a rib 211b provided on the inner circumferential surface. The opening stopper member DS1 is fixed to the inner circumferential surface of the frame body portion 211 via screws.

[0097] Furthermore, the first metal frame 33A and the second metal frame 33B of the metal lower frame 33 are connected by a bridge material B, and are also connected vertically by connecting fittings E1 and E2. With this configuration, even if a fire occurs and the resin bridge material B is destroyed by the heat, the metal lower frame 33 can maintain its connected state by connecting fittings E1 and E2.

[0098] The metal upper frame 31 of the upper frame 3a has a heat-expanded material F2 and an opening stopper member DS2. The heat-expanded material F2 is fixed to the inner circumferential surface of the groove bottom portion 311 via screws. The opening stopper member DS2 is fixed to the outer circumferential surface of the upper portion 314 via screws.

[0099] The metal lower frame 23 of the lower frame 2b has a low-temperature foamed heat-formed material LF2 on the X1 side facing surface of the first wall portion 235. The low-temperature foamed heat-formed material LF2 is fixed via screws. The metal lower frame 33 of the lower frame 3b has a heat-formed material F3, a heat-formed material F4, a low-temperature foamed heat-formed material LF1, and an opening stopper member DS3.

[0100] The heat-expanded foaming material F3 is fixed to the inner circumferential surface of the first bottom portion 331 via screws. At this time, the heat-expanded foaming material F3 is positioned so as not to block the first air intake hole S21 (not shown). The heat-expanded foaming material F4 is fixed to the X1 side surface of the indoor rising portion 337 via ribs 337b. The low-temperature foamed heat-expanded foaming material LF1 and the opening stopper member DS3 are fixed to the bottom portion 3311 via screws.

[0101] As shown in Figure 13, the metal vertical frames 25, 25 of the vertical frames 2c, 2c have heat-expanded foam materials F5, F5. The heat-expanded foam material F5 is crimped and fixed between the projection 256a of the inner plate portion 256 and the projection 257a of the second wall portion 257. The metal vertical frames 35, 35 of the vertical frames 3c, 3c have heat-expanded foam materials F6, F6 and heat-expanded foam materials F7, F7. The heat-expanded foam material F6 is fixed to the inner circumferential surface of the groove bottom portion 351 via screws. The heat-expanded foam material F7 is fixed to the outer circumferential surface of the indoor side projection 355 via screws.

[0102] As shown in Figure 14, when a fire occurs, the heat causes the heat-expandable foaming material F1 to expand, sealing the space between the metal upper frame 21 and the metal upper stile 31. The areas where the heat-expandable foaming material has expanded and filled the space are indicated by transparent diagonal hatching, but these are schematic diagrams and do not strictly represent the boundaries of the expansion.

[0103] The heat-foaming material F2 foams up and seals the space between the surface material holding groove 31G and the surface material G, the heat-foaming materials F3 and F4 foam up and seal the space between the surface material holding groove 33G and the surface material G, and the low-temperature foaming heat-foaming material LF1 and low-temperature foaming heat-foaming material LF2 foam up and seal the space between the metal lower frame 23 and the metal lower frame 33.

[0104] As shown in Figure 15, the heat-expanding materials F5 and F7 expand to seal the space between the metal vertical frame 25 and the metal vertical stile 35, and the heat-expanding material F6 expands to seal the space between the surface material holding groove 35G and the surface material G. This configuration prevents flames from penetrating through the gaps between the frame 2 and stile 3 of the opening window 1.

[0105] This disclosure is not limited to the embodiments described above and can be modified as appropriate. For example, the placement and number of the heat-expanded foaming material F, the low-temperature foamed heat-expanded foaming material LF, and the opening stopper member DS can be freely designed and modified according to the location where the opening window is installed. Furthermore, the method of fixing each fire-resistant component using screws, rivets, etc., can also be freely designed and modified according to the circumstances.

[0106] [Aspect 1] An opening window comprising a frame and a shoji screen having a facing material and a frame for holding the facing material, wherein the frame is provided on the indoor rising wall and is provided with an airtight material that abuts against the frame when the shoji screen is closed, forming a space between the frame and the shoji screen where the air pressure is equal to the outside air pressure when the shoji screen is closed, and the shoji screen comprises a facing material holding groove for holding the facing material and an air intake hole formed in one of the frame constituting the frame and communicating with the space for introducing air into the facing material holding groove. [Aspect 2] The opening window according to aspect 1, wherein the one frame is a lower frame. [Aspect 3] The opening window according to aspect 1 or 2, wherein at least one of the following parts is attached to the one frame: an operating part for opening and closing the shoji screen or a functional part of the shoji screen. [Aspect 4] The casement window according to any one of aspects 1 to 3, further comprising a fin member provided on the indoor side surface at the outer peripheral end of the first frame and contacting the frame when the shoji screen is closed, wherein the fin member extends in the longitudinal direction while forming a gap in a part of the longitudinal direction of the first frame for introducing outside air. [Aspect 5] The casement window according to any one of aspects 1 to 4, wherein the shoji screen has a first air intake hole and a second air intake hole as the air intake holes, wherein the first air intake hole and the second air intake hole are formed in the first frame with their positions offset in at least one of the vertical and horizontal directions. [Aspect 6] The casement window according to aspect 4, wherein the fin member extends in the longitudinal direction while forming gaps at both ends of the longitudinal direction of the first frame for introducing outside air.

[0107] G: facing material, S1: gap, S2: air intake hole, S21: first air intake hole, S22: second air intake hole, Y1, Y2: space, 1: casement window, 2: frame, 3: frame, 3b: bottom frame, 4: airtight material, 6: fin member, 7: handle (operating part), 8: sub-lock (functional part), 31G, 33G, 35G, 35G: facing material holding groove, 254: first wall section (indoor side rising wall), 300: shoji screen

Claims

1. An opening window comprising a frame and a shoji screen having a facing material and a frame for holding the facing material, wherein the frame is provided on the indoor rising wall and is equipped with an airtight material that abuts against the frame when the shoji screen is closed, forming a space between the frame and the shoji screen where the air pressure is equal to the outside air pressure when the shoji screen is closed, and the shoji screen comprises a facing material holding groove for holding the facing material and an air intake hole formed in one of the frames constituting the frame and communicating with the space for introducing air into the facing material holding groove.

2. The casement window according to claim 1, wherein the first frame is a lower frame.

3. The casement window according to claim 1 or 2, wherein the first frame is to which at least one of the following components is attached: an operating component for opening and closing the sliding door or a functional component of the sliding door.

4. The casement window according to any one of claims 1 to 3, further comprising a fin member provided on the indoor side surface at the outer peripheral end of the first frame and in contact with the frame when the shoji screen is closed, wherein the fin member extends in the longitudinal direction while forming a gap in a part of the longitudinal direction of the first frame for introducing outside air.

5. The sliding door has a first air intake hole and a second air intake hole as the air intake holes, and the first air intake hole and the second air intake hole are formed in the frame with their positions offset in at least one of the vertical and horizontal directions, according to any one of claims 1 to 4.

6. The opening window according to claim 4, wherein the fin member is provided extending in the longitudinal direction, forming gaps for introducing outside air at both ends in the longitudinal direction of the first frame.

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