Doors and windows

JP7856546B2Active Publication Date: 2026-05-11YKK AP INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
YKK AP INC
Filing Date
2022-10-28
Publication Date
2026-05-11

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Patent Text Reader

Abstract

To provide a fixture allowing the same shape material as an upper frame with normal strength to be used and capable of improving wind pressure resistance performance.SOLUTION: A double sliding window 1 of a fixture is provided with: a window frame 2 provided with an upper frame 10, a lower frame 20 and right / left vertical frames; an outer sash 5; and an inner sash 6. The upper frame 10 is provided with: an upper frame body 11 to be attached on a skeleton 7, and an upper frame reinforcement material 15 to be fixed on the upper frame body 11. The upper frame reinforcement material 15 is placed between the skeleton 7 and the upper frame body 11 to suppress deformation of the upper frame body 11 by wind load applied on the sash.SELECTED DRAWING: Figure 2
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Description

Technical Field

[0001] The present invention relates to a fitting including a frame and a shoji screen.

Background Art

[0002] As a fitting attached to an opening of a building, a sliding window including an upper frame, a lower frame, and left and right vertical frames, and an outer shoji screen and an inner shoji screen that are slidably arranged within the window frame is widely used (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, sliding windows used in high-rise floors of condominiums or office buildings need to have higher wind resistance performance than sliding windows used in low-rise floors or detached houses. For this reason, it is necessary to use upper frames made of profiles with different cross-sectional shapes for high-strength upper frames for high-rise floors with improved wind resistance performance and normal-strength upper frames for low-rise floors, resulting in an increase in the number of mold types and part types and an increase in cost.

[0005] An object of the present invention is to provide a fitting that can use a common profile as the upper frame of normal strength and can improve wind resistance performance.

Means for Solving the Problems

[0006] The fitting of the present invention is a fitting including a window frame including an upper frame, a lower frame, and left and right vertical frames, and a shoji screen, wherein the upper frame includes an upper frame body attached to a building body, and an upper frame reinforcing member disposed between the building body and the upper frame body and fixed to the upper frame body to suppress deformation of the upper frame body due to wind load applied to the shoji screen. [Effects of the Invention]

[0007] According to the present invention, it is possible to use the same profile material as the upper frame of normal strength, and to provide a building component that can improve wind pressure resistance. [Brief explanation of the drawing]

[0008] [Figure 1] This is an interior view showing a sliding window according to the first embodiment of the present invention. [Figure 2] This is a vertical cross-sectional view showing a sliding window according to the first embodiment. [Figure 3] This is a cross-sectional view showing a sliding window according to the first embodiment. [Figure 4] This is a vertical cross-sectional view showing the upper frame of a sliding window according to the first embodiment. [Figure 5] This is a perspective view showing the upper frame reinforcing member of a sliding window according to the first embodiment. [Figure 6] This is a vertical cross-sectional view showing a sliding window according to the second embodiment. [Figure 7] This is a vertical cross-sectional view showing the upper frame of a sliding window according to the second embodiment. [Figure 8] This is a perspective view showing the upper frame reinforcing member of a sliding window according to the second embodiment. [Figure 9] This is a vertical cross-sectional view showing the upper frame of a sliding window according to the third actual embodiment. [Figure 10] This is a perspective view showing the upper frame reinforcing material of a sliding window according to the third actual embodiment. [Figure 11] This is a vertical cross-sectional view showing the upper frame of a sliding window according to the fourth embodiment. [Modes for carrying out the invention]

[0009] [First Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The sliding window 1, which is a building component according to this embodiment, comprises a window frame 2 and an outer sash 5 and an inner sash 6 that are arranged to slide open and closed within the window frame 2, as shown in Figures 1 to 3. The window frame 2 is a semi-external opening frame fixed to the opening in the building structure 7. In each figure, hatching of the main structural members of the sliding window 1, such as the window frame 2, outer sash 5, and inner sash 6, is omitted. Also, in the following explanation, the left-right direction of the sliding window 1 is defined as the X-axis, the up-down direction of the sliding window 1 is defined as the Y-axis, and the depth direction of the sliding window 1 is defined as the Z-axis. The X, Y, and Z axes are orthogonal to each other.

[0010] Window frame 2 is constructed by framing the upper frame 10, the lower frame 20, and the left and right vertical frames 30 and 40. As shown in Figure 2, the upper frame 10 comprises an upper frame body 11 made of aluminum extruded profile (metal) and an upper frame reinforcing member 15, and is fixed to the building structure 7 located above the opening of the building. As shown in Figure 4, the upper frame body 11 includes an outdoor mounting piece 111, an upper surface 112, a screen door rail 113, a first lower surface 114, a partition piece 115, a second lower surface 116, a hanging piece 117, a cover material mounting piece 121, a first visible piece 122, a reinforcing material fixing piece 123, a second visible piece 124, a frame contact piece 125, an engaging piece 126, an indoor mounting piece 127, a rising piece 128, a guide piece 129, an outer rail 141, and an inner rail 142.

[0011] The outdoor mounting piece 111 is a plate-shaped projection positioned along the outdoor surface 71 of the building structure 7. The upper surface 112 extends outward from the outdoor mounting piece 111. The screen door rail section 113 extends downward from the outdoor end of the upper section 112. The first lower section 114 extends downward from the screen door rail section 113 below the upper section 112 in the Z-axis direction, i.e., in the interior direction. The partition piece 115 extends downward from the upper section 112 and is connected to the first lower section 114. The hollow section 131 is partitioned by the upper section 112, the screen door rail section 113, the first lower section 114, and the partition piece 115, and screw holes are formed in the corners of the hollow section 131 where the first lower section 114 and the partition piece 115 are connected. The second lower surface portion 116 extends along the Z-axis direction from the partition piece portion 115 below the upper surface portion 112 and is connected to the outdoor side attachment piece portion 111. For this reason, the hollow portion 132 is defined by the outdoor side attachment piece portion 111, the upper surface portion 112, the partition piece portion 115, and the second lower surface portion 116. The hanging piece portion 117 hangs downward from the second lower surface portion 116. In this embodiment, the arrangement position of the hanging piece portion 117 in the prospective direction (Z-axis direction) is on the outdoor side of the outdoor side attachment piece portion 111, but it may coincide with the outdoor side attachment piece portion 111 or may be on the indoor side of the outdoor side attachment piece portion 111.

[0012] The cover material attachment piece portion 121 extends along the Z-axis direction from the hanging piece portion 117. A rising piece 128 extending upward is formed at the intermediate position of the cover material attachment piece portion 121 in the Z-axis direction, and screw holes are formed at the corner where the rising piece 128 and the cover material attachment piece portion 121 are connected. The first finding piece portion 122 extends upward from the indoor side end portion of the cover material attachment piece portion 121. The reinforcing material fixing piece portion 123 extends indoors from the upper end of the first finding piece portion 122. The upper surface of the reinforcing material fixing piece portion 123 and the upper surface of the rising piece 128 are set at the same height position. A guide piece 129 extending downward is formed near the indoor side end portion of the reinforcing material fixing piece portion 123. The second finding piece portion 124 extends upward from the indoor side end portion of the reinforcing material fixing piece portion 123. The housing contact portion 125 extends indoors from the upper end of the second finding piece portion 124. The engaging piece portion 126 extends downward from the indoor side end portion of the housing contact portion 125, and an engaging piece protruding outward is formed at its lower end. The indoor side attachment piece portion 127 extends indoors from the engaging piece portion 126, the indoor side end portion thereof extends upward, and the upper end surface thereof is set at the same height position as the upper surface of the housing contact portion 125. In this embodiment, the reinforcing material fixing piece portion 123 is arranged indoors and above the cover material attachment piece portion 121, and the indoor side attachment piece portion 127 is arranged indoors and above the reinforcing material fixing piece portion 123. Further, the reinforcing member fixing piece portion 123 is a part of the shaped material that connects the outdoor side mounting piece portion 111 and the indoor side mounting piece portion 127, and is provided at a distance from the lower surface 72 of the housing 7 between the outdoor side mounting piece portion 111 and the indoor side mounting piece portion 127.

[0013] The outer rail 141 extends downward from the lower surface of the first lower surface portion 114. The inner rail 142 extends downward from the lower surface of the cover material mounting piece portion 121. In the present embodiment, the position of the outer rail 141 in the Z-axis direction is slightly on the outdoor side of the indoor side end portion of the first lower surface portion 114, that is, at the position of the screw hole of the hollow portion 131. Also, the position of the inner rail 142 in the Z-axis direction is slightly on the outdoor side of the rising piece 128.

[0014] As shown in FIGS. 4 and 5, the upper frame reinforcing member 15 is formed by bending a metal material such as a steel plate, and includes a plate-shaped fixing portion 151 and a pair of abutting portions 152. A through hole 153 is formed in the fixing portion 151, and is fixed to the upper frame main body 11 by screwing a screw 165 from the through hole 153 into the reinforcing member fixing piece portion 123. As the screw 165, a drill screw or a tapping screw can be used, and the reinforcing member fixing piece portion 123 is made to have a thickness dimension larger than that of the first finding piece portion 122 and the second finding piece portion 124 so as to have a thickness dimension capable of screwing the screw 165. Also, since the upper surface of the rising piece 128 is at the same height position as the upper surface of the reinforcing member fixing piece portion 123, the fixing portion 151 is placed on the reinforcing member fixing piece portion 123 and the rising piece 128. The abutting portion 152 extends upward from both ends of the fixing portion 151 in the left-right direction, that is, the X-axis direction, and is configured to be able to abut against the lower surface 72 of the housing 7. A plurality of upper frame reinforcing members 15 are attached along the longitudinal direction of the upper frame main body 11, that is, the X-axis direction. For example, they are attached at a total of three locations, namely, the central position in the longitudinal direction of the upper frame main body 11 and the positions corresponding to the centers in the X-axis direction of the outer shutter 5 and the inner shutter 6 in the closed position.

[0015] Since the reinforcing material fixing piece 123 is formed above the cover material mounting piece 121, a space 133 is provided between the upper frame reinforcing material 15 fixed to the reinforcing material fixing piece 123 and the cover material mounting piece 121, and between the rising piece 128 and the first visible piece 122.

[0016] The upper frame body 11 is fitted with a rail-to-rail cover material 17 and an indoor-side cover material 18 made of synthetic resin. The rail-to-rail cover material 17 is positioned between the outer rail 141 and the inner rail 142 on the indoor side of the outer sash 5 when it is in the closed position, and therefore its length is approximately half the length of the upper frame body 11. The rail-to-rail cover material 17 is attached to the upper frame body 11 by engaging the substantially L-shaped engaging pieces 171 and 172 of the rail-to-rail cover material 17 with the protruding pieces that extend from the partition piece 115 and the hanging piece 117.

[0017] The indoor cover material 18 is a resin profile that extends over substantially the entire length of the upper frame body 11 in the longitudinal direction (X-axis direction). The indoor cover material 18 comprises a fixed surface portion 181 positioned along the lower surface of the cover material mounting piece portion 121, a rail cover portion 182 extending downward from the outdoor end of the fixed surface portion 181 and positioned along the indoor surface of the inner rail 142, a hollow portion 183 connected to the indoor end of the fixed surface portion 181, and an engaging portion 184 extending upward from the hollow portion 183 and engaging with the engaging piece portion 126. The fixed surface portion 181 is fixed to the cover material mounting piece portion 121 by screws 166. Similar to screws 165, self-drilling screws or tapping screws can be used for the screws 166, and the portion of the cover material mounting piece portion 121 into which the screws 166 are screwed is a thicker portion than other parts of the cover material mounting piece portion 121, so as to be thick enough to accommodate the screws 166. The rail cover portion 182 has a groove at its lower end into which the lower end of the inner rail 142 is inserted. Furthermore, an engagement groove is formed on the outer surface of the upper end of the rail cover portion 182 into which a projection extending inward from the upper end of the inner rail 142 engages. The hollow portion 183 is a hollow section that extends upward and downward from the fixed surface portion 181, and its upper end on the exterior side is in contact with the guide piece 129. Also, on the interior side of the hollow portion 183, as shown in Figure 2, a trim piece 74, such as a frame, is placed to be attached to the building structure 7 after the sliding window 1 is installed.

[0018] The interior cover material 18 improves the thermal insulation performance of the upper frame 10 by covering the interior surface of the upper frame body 11 that is exposed to the interior side. Since the reinforcing material fixing piece 123 is formed above the cover material mounting piece 121, it is located between the fixing surface portion 181 of the indoor cover material 18 fixed to the cover material mounting piece 121 and the reinforcing material fixing piece 123, and a space 134 is provided between the first visible piece 122 and the guide piece 129 and hollow portion 183.

[0019] The upper frame 10 having the above configuration has the upper frame reinforcing member 15 fixed to the upper frame body 11 in advance with screws 165. Then, the outdoor mounting piece 111 is brought into contact with the outdoor surface 71 of the building structure 7, the contact portion 152 of the upper frame reinforcing member 15 and the building structure contact portion 125 of the upper frame body 11 are brought into contact with the lower surface 72 of the building structure 7, and the outdoor mounting piece 111 and the indoor mounting piece 127 are fixed to the building structure 7 with screws 161 and 162. Furthermore, as shown in Figure 2, an exterior wall material 75 is placed on the exterior side of the exterior mounting piece 111, a backup material 76 and a sealing material 77 are placed between the exterior wall material 75 and the upper surface 112, and a trim material 74 is placed on the interior side of the interior cover material 18 to cover the interior mounting piece 127 and screws 162.

[0020] As shown in Figure 2, the lower frame 20 is composed of an outdoor member 210 and an indoor member 220 made of aluminum extruded profiles (metal), and an insulating member 230 made of synthetic resin such as urethane resin that connects the outdoor member 210 and the indoor member 220. The exterior member 210 has an exterior mounting piece 211 that is fixed to the exterior surface of the building frame 7 with screws 161, and an exterior rail 241 that guides the exterior sash 5. The interior member 220 has an interior mounting piece 221 that is fixed to the upper surface of the building frame 7 with screws 162, and an interior rail 242 that guides the interior sash 6.

[0021] The lower frame 20 is fitted with a rail-to-rail cover material 25, an interior-side cover material 26, and an interior-surface cover material 27, all made of synthetic resin. The rail-to-rail cover material 25 is positioned between the outer rail 241 and the inner rail 242 on the indoor side of the outer sash 5 when it is in the closed position, and therefore its length is approximately half the length of the lower frame 20. The rail-to-rail cover material 25 is positioned between the outer rail 241 and the inner rail 242 and is attached by engaging with the outdoor member 210.

[0022] The interior cover material 26 is a resin profile that extends over approximately the entire length (X-axis direction) of the lower frame 20. The interior cover material 26 is positioned on the interior side of the interior rail 242 and is attached by engaging with the interior member 220. The interior surface cover material 27 is a resin profile that extends over approximately the entire length (X-axis direction) of the lower frame 20. The interior surface cover material 27 is attached by engaging with the interior surface of the interior member 220. Finishing materials 74, such as picture frames and flooring, are placed on the interior side of the interior surface cover material 27.

[0023] As shown in Figure 3, the vertical frame 30 is formed from an aluminum extruded profile and comprises a projection piece 311, an exterior mounting piece 312 extending from the projection piece 311 in the visible direction (X-axis direction) and fixed to the exterior surface 71 of the building structure 7 with screws 161, an interior mounting piece 313 formed at the interior end of the projection piece 311 and fixed to the projection surface of the building structure 7 with screws 162, and a pull-in piece 314 extending inward from the projection piece 311 and contacting the exterior sash 5 when it is closed. A synthetic resin cover material 35 is attached to the projection piece 311 of the vertical frame 30. This cover material 35 is attached so as to cover the interior side of the inner circumferential surface of the projection piece 311 more than the pull-in piece 314. As a result, when the outer sash 5 is closed, the projection piece 311 of the vertical frame 30 is covered by the cover material 35 and is not exposed to the interior side.

[0024] On the exterior side of the mounting piece 312 on the vertical frame 30 and the mounting piece 412 on the vertical frame 40, exterior wall material 75, backup material 76, and sealing material 77 are arranged, similar to the upper frame 10 and lower frame 20. In addition, decorative materials 74 such as picture frames are arranged on the interior side of the cover materials 35 and 45.

[0025] The vertical frame 40 is made of an aluminum extruded profile and comprises a projection piece 411, an exterior mounting piece 412 extending from the projection piece 411 in the visible direction (X-axis direction) and fixed to the exterior surface 71 of the building structure 7 with screws 161, an interior mounting piece 413 formed at the interior end of the projection piece 411 and fixed to the projection surface of the building structure 7 with screws 162, and a pull-in piece 414 extending inward from the projection piece 411 and contacting the interior sash 6 when it is closed. A synthetic resin cover material 45 is attached to the projection piece 411 of the vertical frame 40. This cover material 45 is attached so as to cover the interior side of the inner surface of the projection piece 411 more than the pull-in piece 414. As a result, when the interior sash 6 is closed, the projection piece 411 of the vertical frame 40 is covered by the cover material 45 and is not exposed to the interior side.

[0026] As shown in Figures 1 to 3, the outer shoji screen 5 is constructed by assembling an upper frame 51, a lower frame 52, vertical frames 53, an outer meeting frame 54, and double-glazed glass 55. The interior shoji screen 6 is constructed by assembling an upper frame 61, a lower frame 62, vertical frames 63, an interior meeting frame 64, and double-glazed glass 65. The upper frames 51, 61, the lower frames 52, 62, the vertical frames 53, 63, and the inner meeting frame 64 are formed by engaging the outer profiles 511, 611, 521, 621, 531, 631, 641, which are made of aluminum extruded profiles, with the inner profiles 512, 612, 522, 622, 532, 632, 642, which are made of flame-retardant resin extruded profiles. The outer meeting frame 54 is also made of aluminum extruded profiles. Hollow sections are formed in the inner profiles 512, 612, 522, 622, 532, 632, 642. Therefore, the outer sash 5 and inner sash 6 are equipped with resin interior profiles 512, 612, 522, 622, 532, 632, and 642, and furthermore, the interior profiles 512, 612, 522, 622, 532, 632, and 642 have hollow sections, thus improving the thermal insulation performance of the sliding window 1.

[0027] [Effects of the First Embodiment] In this embodiment of the sliding window 1, since the upper frame reinforcing member 15 is attached to the upper frame body 11, the wind load applied to the inner sash 6 is applied to the upper frame body 11 via the inner rail 142. Even if a load is applied that causes, for example, the cover material mounting piece 121 to bend upward, the contact portion 152 of the upper frame reinforcing member 15 attached to the upper frame body 11 contacts the lower surface 72 of the building structure 7, thereby suppressing deformation of the upper frame body 11. For this reason, a sliding window 1 with improved wind pressure resistance of the upper frame 10 can be provided. Furthermore, by attaching the upper frame reinforcing member 15 to the upper frame body 11, the wind pressure resistance performance is improved, so the upper frame body 11 can be used interchangeably with the aluminum extruded profile used as the upper frame for lower floors. Therefore, depending on whether or not the upper frame reinforcing member 15 is attached, the same cross-sectional aluminum extruded profile can be used for the upper frame with normal wind pressure resistance performance for lower floors and the upper frame with high wind pressure resistance performance for higher floors, thereby reducing the number of parts and costs. Furthermore, by providing resin interior profiles 512, 612, 522, 622, 532, 632, and 642 having hollow sections to improve thermal insulation performance, the depth dimensions of the outer sash 5 and inner sash 6 are increased, and consequently the depth dimensions of the upper frame body 11 are also increased. Even if the upper frame body 11 becomes more susceptible to deformation, the upper frame reinforcing material 15 is provided to suppress deformation of the upper frame body 11. Therefore, a high-strength upper frame 10, i.e., a sliding window 1, with high thermal insulation performance and wind pressure resistance can be provided.

[0028] Since the upper frame reinforcement member 15 is placed on the reinforcement fixing piece 123 and the rising piece 128 which are continuous in the X-axis direction on the upper frame body 11, the upper frame reinforcement member 15 can be supported at two locations in the Z-axis direction, preventing the upper frame reinforcement member 15 from tilting and ensuring that the contact portion 152 can reliably contact the lower surface 72 of the building structure 7. The upper frame reinforcement member 15 has its fixing part 151 fixed to the reinforcement member fixing piece 123 with a screw 165, so that the upper frame body 11 can be fixed to the building structure 7 while attached to the upper frame body 11. For this reason, the upper frame reinforcement member 15 can be attached to the upper frame body 11 in advance at a sash assembly plant or similar facility, and does not need to be attached to the upper frame body 11 at the construction site, thus preventing a decrease in on-site construction work efficiency. Furthermore, since the reinforcing material fixing piece 123 is positioned below the structural body contact piece 125 by the height dimension of the second visible piece 124, a space equal to the height dimension of the second visible piece 124 can be secured between the reinforcing material fixing piece 123 and the lower surface 72 of the structural body 7, and the upper frame reinforcing material 15 can be placed in this space. For this reason, there are fewer constraints on the thickness dimension when placing the upper frame reinforcing material 15, and the upper frame reinforcing material 15 can be made of a thick metal material, and the upper frame reinforcing material 15 can be used according to the required wind pressure resistance performance.

[0029] The reinforcing material fixing piece 123 is formed on the interior side of the cover material mounting piece 121 and at a higher position than the cover material mounting piece 121 in the depth direction (Z-axis direction). Therefore, even if the positions of the upper frame reinforcing material 15 and the screw 166 in the X-axis direction coincide, the tip of the screw 166 that is screwed into the cover material mounting piece 121 can be positioned in the space 133 between the upper frame reinforcing material 15 and the cover material mounting piece 121, preventing the screw 166 from interfering with the upper frame reinforcing material 15. As a result, the interior side cover material 18 can be fixed to the cover material mounting piece 121 with the screw 166, and the detachment of the interior side cover material 18 can be reliably prevented. Furthermore, a space 134 can be formed between the fixing surface portion 181 of the indoor cover material 18, which is fixed to the cover material mounting piece 121, and the reinforcing material fixing piece 123. The tip of the screw 165, which is screwed into the reinforcing material fixing piece 123, can be positioned in this space 134, preventing the screw 165 from interfering with the indoor cover material 18. In addition, since the screw 165 is hidden by the indoor cover material 18 and not exposed on the indoor side, the interior design of the sliding window 1 can be improved.

[0030] The indoor cover material 18 has a hollow portion 183 at its indoor end, and since this hollow portion 183 is in contact with the guide piece 129, the engaging portion 184 can be pressed against the engaging piece portion 126, and the engaging portion 184 can be reliably engaged with the engaging piece portion 126. Furthermore, when attaching the trim piece 74 to the frame 7, the trim piece 74 is positioned by contacting the interior cover material 18. In this case, since the trim piece 74 contacts the highly rigid hollow portion 183, deformation of the hollow portion 183 can also be prevented.

[0031] The reinforcing material fixing piece 123 is positioned on the interior side of the cover material mounting piece 121 and on the exterior side of the building structure contact piece 125 in the depth direction (Z-axis direction), and further, in the vertical direction (Y-axis direction), it is positioned above the cover material mounting piece 121 and below the building structure contact piece 125. Therefore, when the upper frame reinforcing material 15 is attached to the reinforcing material fixing piece 123, the upper surface of the contact piece 152 and the upper surface of the building structure contact piece 125 are positioned close together, making it easy to confirm whether they are set at the same height and can contact the lower surface 72 of the building structure 7. Furthermore, since the upper frame reinforcement member 15 is positioned in the depth direction from the position of the indoor surface of the outdoor mounting piece 111 to the outdoor side of the structural contact piece 125, that is, the position of the second visible piece 124, the contact area of ​​the contact piece 152 with the lower surface 72 can be made relatively large, and the load applied from the contact piece 152 to the lower surface 72 can be distributed.

[0032] Since hollow sections 131 and 132 are formed in the upper frame body 11, the rigidity of the outer portion of the upper frame body 11 can be improved compared to the outer mounting piece 111. Therefore, even if the wind load applied to the outer sash 5 is applied to the upper frame body 11 via the outer rail 141, deformation of the upper frame body 11 can be suppressed. As a result, the wind pressure resistance performance of the upper frame 10 can be further improved.

[0033] Since the interior cover material 18 covers the surface of the upper frame 10 that is on the interior side of the inner rail 142, the thermal insulation performance of the upper frame 10 can be improved compared to when the upper frame body 11 made of aluminum extruded profile is exposed to the interior space. Furthermore, since the interior cover material 18 has a hollow portion 183 on the interior side, the thermal insulation performance of the upper frame 10 can be further improved.

[0034] [Second Embodiment] Next, the sliding window 1B of the second embodiment will be described with reference to Figures 6 to 8. Note that the configuration of the upper frame 10B and the upper frame reinforcing member 15B of the sliding window 1B differs from that of the first embodiment, but the other components are the same as those of the sliding window 1 of the first embodiment, so the same reference numerals are used and their descriptions are omitted. As shown in Figures 6 and 7, the upper frame 10B of the window frame 2B of the sliding window 1B is composed of an upper frame body 11B and an upper frame reinforcing member 15B. The upper frame body 11B is composed of an exterior member 110B and an interior member 120B made of aluminum extruded profiles (metal), and an insulating member 130B made of synthetic resin such as urethane resin that connects the exterior member 110B and the interior member 120B.

[0035] The outdoor member 110B has a structure similar to the portion on the outdoor side of the upper frame body 11 of the first embodiment, and comprises an outdoor mounting piece 111B, an upper surface portion 112B, a screen door rail portion 113B, a first lower surface portion 114B, a partition piece 115B, a second lower surface portion 116B, a hanging piece 117B, a connecting piece 118B, an outer rail 141B, a hollow portion 131B, and a hollow portion 132B. The outdoor mounting piece 111B, upper surface 112B, screen door rail 113B, first lower surface 114B, partition piece 115B, second lower surface 116B, outer rail 141B, hollow section 131B, and hollow section 132B have the same configuration as the outdoor mounting piece 111, upper surface 112, screen door rail 113, first lower surface 114, partition piece 115, second lower surface 116, outer rail 141, hollow section 131, and hollow section 132 of the first embodiment, so their description is omitted. The lower end of the outdoor mounting piece 111B and the hanging piece 117B are connected by a connecting piece 118B. The hanging piece 117B and the connecting piece 118B have a holding portion for holding the heat insulating member 130B.

[0036] The interior member 120B has a structure similar to the portion of the upper frame body 11 on the interior side than the exterior mounting piece 111 of the first embodiment, and comprises a cover material mounting piece 121B, a first visible piece 122B, a reinforcing material fixing piece 123B, a second visible piece 124B, a body contact piece 125B, an engaging piece 126B, an interior mounting piece 127B, a rising piece 128B, a guide piece 129B, an interior rail 142B, a space 133B, and a space 134B. The cover material mounting piece 121B, the first visible piece 122B, the reinforcing material fixing piece 123B, the second visible piece 124B, the building structure contact piece 125B, the engaging piece 126B, the indoor side mounting piece 127B, the guide piece 129B, the inner rail 142B, the space 133B, and the space 134B have the same configuration as the cover material mounting piece 121, the first visible piece 122, the reinforcing material fixing piece 123, the second visible piece 124, the building structure contact piece 125, the engaging piece 126, the indoor side mounting piece 127, the guide piece 129, the inner rail 142, the space 133, and the space 134 of the first embodiment, so their description is omitted. The rising piece 128B has a holding portion that holds the heat insulating member 130B.

[0037] As shown in Figures 7 and 8, the upper frame reinforcing member 15B is formed by bending a metal material such as a steel plate and comprises a plate-shaped fixing portion 151B, a pair of contact portions 152B, a frame fixing piece 154B, and a connecting piece 155B. A through hole 153B is formed in the fixing portion 151B, and by screwing a screw 165 through this through hole 153B into the reinforcing material fixing piece 123B, the upper frame reinforcing material 15B is fixed to the interior member 120B of the upper frame body 11B. This fixing portion 151B constitutes a second fixing portion that is fixed to the reinforcing material fixing piece 123B. The contact portion 152B extends upward from both ends of the fixing portion 151B in the left-right direction, i.e., in the X-axis direction, and is configured to contact the lower surface 72 of the building structure 7. The structural fixing piece 154B is formed in the shape of a rectangular plate and is positioned between the outdoor mounting piece 111B and the outdoor surface 71 of the structural frame 7. The structural fixing piece 154B has an elongated hole 156B formed in the X-axis direction, and a screw 161 for fixing the outdoor mounting piece 111B is inserted through this elongated hole 156B. In other words, the structural fixing piece 154B is fixed to the structural frame 7 together with the outdoor mounting piece 111B by the screw 161, and this structural fixing piece 154B constitutes a first fixing part that is positioned along the indoor surface of the outdoor mounting piece 111B and fixed to the structural frame 7.

[0038] The connecting piece 155B is the part that connects the frame fixing piece 154B and the fixing part 151B, and as shown in Figure 7, it is positioned diagonally along the upper frame body 11B. That is, the outdoor member 110B and the indoor member 120B are extruded with the connecting piece 118B and the rising piece 128B connected, and after filling the lower opening between the hanging piece 117B and the cover material mounting piece 121B with synthetic resin for the insulation member 130B, the section between the connecting piece 118B and the rising piece 128B is cut with a sawtooth to form the structure. The connecting portion to be cut is made into an inclined surface so that this sawtooth does not interfere with the outdoor mounting piece 111B, etc. For this reason, the connecting piece 155B is inclined so that it is positioned along the inclined surface after cutting. Multiple upper frame reinforcing members 15B are attached along the longitudinal direction, or X-axis direction, of the upper frame body 11B. For example, as in the first embodiment, they are attached at a total of three locations: the central position in the longitudinal direction of the upper frame body 11B, and the central position in the X-axis direction of the outer sash 5 and inner sash 6 when they are in the closed position.

[0039] Furthermore, the upper frame body 11B is fitted with rail-interval cover material 17 and indoor-side cover material 18, just as in the first embodiment. Since the configuration of the rail-interval cover material 17 and indoor-side cover material 18 is the same as in the first embodiment, the same reference numerals are used and their description is omitted.

[0040] [Effects of the second embodiment] In the sliding window 1B of the second embodiment, the upper frame 10B is also equipped with an upper frame reinforcing member 15B, which improves the wind pressure resistance performance of the upper frame 10B and provides the same effects as the first embodiment. In particular, the upper frame reinforcing member 15B has a frame fixing piece 154B that is fixed to the exterior surface 71 of the frame 7 and a contact portion 152B that abuts against the lower surface 72 of the frame 7, so that the wind load applied to the interior member 120B of the upper frame 10B can be supported by the frame 7 via the frame fixing piece 154B and the contact portion 152B. As a result, it is possible to prevent the interior member 120B of the upper frame 10B from bending and deforming due to the wind load.

[0041] Since the upper frame 10B is constructed by connecting the exterior member 110B and the interior member 120B with an insulating member 130B, the insulating member 130B can block heat conduction between the exterior member 110B and the interior member 120B, thereby improving the thermal insulation performance of the sliding window 1B equipped with the upper frame 10B. Furthermore, since the upper frame reinforcement member 15B is fixed across the exterior member 110B and the interior member 120B, even if the insulation member 130B melts during a fire, the condition of the exterior member 110B and the interior member 120B can be maintained, thereby improving fire resistance. Furthermore, since the frame fixing piece 154B of the upper frame reinforcing member 15B has an elongated hole 156B, even if the mounting position of the upper frame reinforcing member 15B is slightly shifted in the X-axis direction relative to the outdoor mounting piece 111B, the screw 161 can be screwed into the frame 7 through the elongated hole 156B.

[0042] [Third Embodiment] Next, the upper frame 10C of the sliding window 1C of the third embodiment will be described with reference to Figures 9 to 10. Since the sliding window 1C differs from the second embodiment only in the configuration of the upper frame reinforcing member 15C, the components other than the upper frame reinforcing member 15C will be given the same reference numerals as in the second embodiment, and their descriptions will be simplified or omitted. As shown in Figure 9, the upper frame 10C of the sliding window 1C is composed of an upper frame body 11B and an upper frame reinforcing member 15C. The upper frame body 11B is the same as that of the second embodiment, so it is given the same reference numerals and its description is omitted.

[0043] As shown in Figure 10, the upper frame reinforcing member 15C is formed by bending a metal material such as a steel plate and comprises a plate-shaped fixing part 151C, a frame fixing piece 154C, and a connecting piece 155C. Multiple through holes 153C are formed in the fixing portion 151C at predetermined intervals along the X-axis direction. By screwing screws 165 into the reinforcing material fixing piece portion 123B through these through holes 153C, the upper frame reinforcing material 15C is fixed to the interior member 120B of the upper frame body 11B. Therefore, in the upper frame reinforcing material 15C, the fixing portion 151C is the second fixing portion.

[0044] The structural fixing piece 154C is positioned between the outdoor mounting piece 111B and the outdoor surface 71 of the structural frame 7. The structural fixing piece 154C has multiple elongated holes 156C formed in it at predetermined intervals along the X-axis. Screws 161 for fixing the outdoor mounting piece 111B are inserted through the elongated holes 156C. In other words, the structural fixing piece 154C is fixed to the structural frame 7 together with the outdoor mounting piece 111B by the screws 161. Therefore, in the upper frame reinforcement member 15C, the structural fixing piece 154C is the first fixing part. The connecting piece 155C is the part that connects the frame fixing piece 154C and the fixing part 151C, and as shown in Figure 9, it is positioned diagonally along the upper frame body 11B. The upper frame reinforcement member 15B is positioned along the entire length of the upper frame body 11B in the longitudinal direction.

[0045] [Effects of the third embodiment] In the sliding window 1C of the third embodiment, the upper frame 10C is equipped with an upper frame reinforcing member 15C, so the same effects as in the first and second embodiments can be obtained, such as improving the wind pressure resistance performance of the upper frame 10C. Furthermore, since the upper frame reinforcement member 15C is fixed across the exterior member 110B and the interior member 120B, even if the insulation member 130B melts during a fire, the condition of the exterior member 110B and the interior member 120B can be maintained, thereby improving fire resistance.

[0046] The upper frame reinforcement member 15C can be easily constructed simply by bending a metal plate. Furthermore, since the upper frame reinforcement member 15C is arranged along the entire length of the upper frame body 11B in the longitudinal direction (X-axis direction), the wind pressure resistance performance of the upper frame 10C can be further improved compared to the case where multiple short, piece-shaped upper frame reinforcement members are arranged at various locations.

[0047] [Fourth Embodiment] Next, the sliding window 1D of the fourth embodiment will be described with reference to Figure 11. The sliding window 1D is formed by attaching the upper frame reinforcement member 15C of the third embodiment to the upper frame body 11 of the first embodiment. As shown in Figure 11, the upper frame 10D of the sliding window 1D is composed of an upper frame body 11 and an upper frame reinforcing member 15C. The upper frame body 11 is the same as the upper frame body 11 of the first embodiment, so it is given the same reference numeral and its description is omitted. The upper frame reinforcing member 15C is the same as the upper frame reinforcing member 15C of the third embodiment, so it is given the same reference numeral and its description is omitted.

[0048] [Effects of the fourth embodiment] The upper frame 10D of the sliding window 1D in the third embodiment is equipped with the upper frame body 11 of the first embodiment and the upper frame reinforcing member 15C of the third embodiment, so the same effects as in the first to third embodiments can be obtained, such as improving the wind pressure resistance performance of the upper frame 10D.

[0049] [Differentiation] In the above embodiment, the upper frame body 11B having the heat insulating member 130B was fitted with upper frame reinforcing members 15B and 15C having fixing parts 151B and 151C and structural fixing pieces 154B and 154C. However, if fire resistance is not required, or if melting prevention of the heat insulating member 130B can be achieved by other structures, an upper frame reinforcing member 15 may be used instead. The upper frame reinforcement member 15 was constructed by bending a metal plate, but it may also be constructed from a block-shaped member made of metal or resin. Although the upper frame reinforcement member 15C was positioned along the entire length of the upper frame bodies 11 and 11B in the longitudinal direction, it may also be formed in piece form and attached to multiple locations on the upper frame bodies 11 and 11B, similar to the upper frame reinforcement members 15 and 15B.

[0050] The structure of the upper frame bodies 11 and 11B is not limited to the above embodiment, and is sufficient as long as it is configured to be able to fix at least the upper frame reinforcing members 15, 15B, and 15C. Therefore, as a joinery, it is sufficient as long as the upper frame reinforcing members can be placed between the building frame and the upper frame body, and is not limited to semi-externally mounted sliding windows, but can also be internally mounted sliding windows. Furthermore, as a joinery, it is not limited to sliding windows, but can also be other types of windows such as single-hung windows.

[0051] [Summary of the invention] The present invention relates to a window frame comprising an upper frame, a lower frame, and left and right vertical frames, and a sliding door, wherein the upper frame comprises an upper frame body attached to the building structure, and an upper frame reinforcing member disposed between the building structure and the upper frame body and fixed to the upper frame body, which suppresses deformation of the upper frame body due to wind load applied to the sliding door. According to the present invention, since the upper frame reinforcing material that suppresses deformation due to wind load applied to the shoji screen is fixed to the upper frame body, the upper frame body of a building fixture that requires high wind pressure resistance, such as a fixture installed on a high floor, can be constructed using the same material as the upper frame for a low floor. Therefore, the upper frame body can be standardized for both high-strength and normal-strength upper frames, and the wind pressure resistance can be selected by the presence or absence of the upper frame reinforcing material. This reduces costs compared to changing the structure of the upper frame body itself for high-strength and normal-strength applications. In particular, in the case of a shoji screen with a large depth dimension, such as a shoji screen composed of a metal exterior member and a resin interior member with a hollow section, the depth dimension of the upper frame needs to be increased in proportion to the increase in the depth dimension of the shoji screen. Even in this case, by providing the upper frame reinforcing material, wind pressure resistance can be easily improved, and a building fixture with high thermal insulation and wind pressure resistance can be provided.

[0052] In the building fitting of the present invention, the upper frame body preferably comprises an outdoor mounting piece attached to the outdoor surface of the building structure, an indoor mounting piece attached to the lower surface of the building structure on the indoor side of the outdoor mounting piece, and a reinforcing material fixing piece provided spaced apart from the lower surface of the building structure between the outdoor mounting piece and the indoor mounting piece, and the upper frame reinforcing material preferably comprises a fixing portion fixed to the reinforcing material fixing piece and a contact portion that abuts against the lower surface of the building structure. According to the present invention, the fixing portion of the upper frame reinforcing material is fixed to the reinforcing material fixing piece of the upper frame body, and the contact portion of the upper frame reinforcing material contacts the lower surface of the building structure. As a result, the wind load applied to the upper frame body can be supported by the building structure via the upper frame reinforcing material, and deformation of the upper frame body can be prevented.

[0053] In the building fitting of the present invention, the upper frame body preferably comprises an outdoor mounting piece attached to the outdoor surface of the building structure, an indoor mounting piece attached to the lower surface of the building structure on the indoor side of the outdoor mounting piece, and a reinforcing material fixing piece provided spaced apart from the lower surface of the building structure between the outdoor mounting piece and the indoor mounting piece, and the upper frame reinforcing material preferably comprises a first fixing part arranged along the indoor surface of the outdoor mounting piece and fixed to the building structure, and a second fixing part fixed to the reinforcing material fixing piece. According to the present invention, the first fixing part of the upper frame reinforcing member is fixed to the exterior surface of the building structure together with the exterior mounting piece of the upper frame body, and the second fixing part of the upper frame reinforcing member is fixed to the fixing piece of the reinforcing member. As a result, the wind load applied to the upper frame body can be supported by the building structure via the upper frame reinforcing member, preventing deformation of the upper frame body. Furthermore, in order to improve thermal insulation performance, if the upper frame body is configured to include a metal exterior member having an exterior mounting piece, a metal interior member having an interior mounting piece, and a resin thermal insulation member connecting the exterior and interior members, the upper frame reinforcing member can be fixed across the exterior and interior members. Therefore, even if the thermal insulation member melts during a fire, the upper frame reinforcing member can maintain the connection between the exterior and interior members, ensuring not only improved thermal insulation performance but also fire resistance.

[0054] In the building fitting of the present invention, the upper frame body preferably comprises an outdoor mounting piece attached to the outdoor surface of the building structure, an indoor mounting piece attached to the lower surface of the building structure on the indoor side of the outdoor mounting piece, and a reinforcing material fixing piece provided spaced apart from the lower surface of the building structure between the outdoor mounting piece and the indoor mounting piece, and the upper frame reinforcing material preferably comprises a first fixing part arranged along the indoor surface of the outdoor mounting piece and fixed to the building structure, a second fixing part fixed to the reinforcing material fixing piece, and a contact part that abuts against the lower surface of the building structure. According to the present invention, the load applied to the reinforcing material fixing piece can be supported by the building structure via the second fixing part, the first fixing part, and the contact part, thereby improving the reinforcing performance and preventing deformation of the upper frame body. Furthermore, in order to improve thermal insulation performance, if the upper frame body is configured to include a metal outdoor member having an outdoor mounting piece, a metal indoor member having an indoor mounting piece, and a resin thermal insulation member connecting the outdoor member and the indoor member, the upper frame reinforcing material can be fixed across the outdoor member and the indoor member. Therefore, even if the thermal insulation member melts in the event of a fire, the state in which the outdoor member and the indoor member are connected by the upper frame reinforcing material can be maintained, ensuring fire resistance in addition to improved thermal insulation performance.

[0055] In the building fittings of the present invention, the interior side of the upper frame body is covered with an interior cover material made of synthetic resin, and the upper frame body preferably comprises a cover material mounting piece to which the interior cover material is attached, a reinforcing material fixing piece positioned on the interior side and above the cover material mounting piece to which the upper frame reinforcing material is fixed, and an interior mounting piece positioned on the interior side and above the reinforcing material fixing piece to which the upper frame is attached to the lower surface of the building structure. According to the present invention, the indoor side of the upper frame body is covered with an indoor cover material, thereby improving thermal insulation performance. Furthermore, when the upper frame reinforcing material is fixed to the reinforcing material fixing piece, a space is secured between the upper frame reinforcing material and the cover material mounting piece. Therefore, when the indoor cover material is attached to the lower surface of the cover material mounting piece with screws, the tip of the screw can be housed in this space, and the indoor cover material can be securely attached to the upper frame body. Furthermore, since the reinforcing material fixing piece is positioned lower than the interior mounting piece attached to the underside of the building structure, a space can be secured between the reinforcing material fixing piece and the underside of the building structure, allowing the upper frame reinforcing material to be placed in this space. Therefore, there are fewer constraints on the thickness dimension when placing the upper frame reinforcing material, and the necessary strength for the upper frame reinforcing material can be secured.

[0056] In the building fittings of the present invention, the interior cover material is preferably positioned spaced apart below the reinforcing material fixing piece, the upper frame reinforcing material is preferably fixed to the reinforcing material fixing piece with screws, and the portion of the screws protruding downward from the reinforcing material fixing piece is preferably positioned in the space between the reinforcing material fixing piece and the interior cover material. According to the present invention, the screws that fix the upper frame reinforcement can be placed in the space formed between the reinforcement fixing piece and the interior cover material, so that the screws are not exposed on the interior side and can be hidden by the interior cover material, thereby improving the interior design of the joinery.

[0057] In the building fittings of the present invention, it is preferable that the upper frame and the lower frame are provided with an outer rail and an inner rail, and the sliding door is provided with an outer sliding door guided by the outer rail and an inner sliding door guided by the inner rail. According to the present invention, the wind pressure resistance performance of the upper frame can be improved in a sliding window equipped with an outer sash and an inner sash, making it possible to easily and inexpensively provide a high-strength sliding window for high-rise floors. [Explanation of Symbols]

[0058] 1...Sliding window, 1B...Sliding window, 1C...Sliding window, 1D...Sliding window, 2...Window frame, 2B...Window frame, 5...Exterior sash, 6...Interior sash, 7...Structure, 10...Upper frame, 10B...Upper frame, 10C...Upper frame, 10D...Upper frame, 11...Upper frame body, 11B...Upper frame body, 15...Upper frame reinforcement, 15B...Upper frame reinforcement, 15C...Upper frame reinforcement, 18...Room Inner cover material, 20...Bottom frame, 30...Vertical frame, 40...Vertical frame, 71...Exterior surface, 72...Bottom surface, 74...Trim material, 110B...Exterior component, 111...Exterior mounting piece, 111B...Exterior mounting piece, 120B...Interior component, 121...Cover material mounting piece, 121B...Cover material mounting piece, 123...Reinforcement material fixing piece, 123B...Reinforcement material Fixing piece, 125... Frame contact piece, 125B... Frame contact piece, 127... Indoor mounting piece, 127B... Indoor mounting piece, 130B... Insulation member, 131... Hollow part, 131B... Hollow part, 132... Hollow part, 132B... Hollow part, 133... Space, 133B... Space, 134... Space, 134B... Space, 141... Outer rail, 141 B...outer rail, 142...inner rail, 142B...inner rail, 151...fixing part, 151B...fixing part, 151C...fixing part, 152...contact part, 152B...contact part, 154B...frame fixing piece, 154C...frame fixing piece, 155B...connecting piece, 155C...connecting piece, 161...screw, 162...screw, 165...screw, 166...screw.

Claims

1. A window frame comprising an upper frame, a lower frame, and left and right vertical frames, and a shoji screen, The aforementioned upper frame is, The upper frame body is attached to the building structure, The system includes an upper frame reinforcing member that is positioned between the frame and the upper frame body and fixed to the upper frame body, and which suppresses deformation of the upper frame body due to wind load applied to the sliding door, The upper frame body comprises an outdoor mounting piece attached to the outdoor surface of the building structure, an indoor mounting piece attached to the lower surface of the building structure on the indoor side of the outdoor mounting piece, and a reinforcing material fixing piece provided spaced apart from the lower surface of the building structure between the outdoor mounting piece and the indoor mounting piece. The aforementioned upper frame reinforcing member is A fixing part fixed to the reinforcing material fixing piece, It comprises a contact portion that abuts against the lower surface of the aforementioned frame. A type of joinery characterized by its features.

2. A window frame comprising an upper frame, a lower frame, and left and right vertical frames, and a shoji screen, The aforementioned upper frame is, The upper frame body is attached to the building structure, The system includes an upper frame reinforcing member that is positioned between the frame and the upper frame body and fixed to the upper frame body, and which suppresses deformation of the upper frame body due to wind load applied to the sliding door, The upper frame body comprises an outdoor mounting piece attached to the outdoor surface of the building structure, an indoor mounting piece attached to the lower surface of the building structure on the indoor side of the outdoor mounting piece, and a reinforcing material fixing piece provided spaced apart from the lower surface of the building structure between the outdoor mounting piece and the indoor mounting piece. The aforementioned upper frame reinforcing member is A first fixing portion is arranged along the interior surface of the exterior mounting piece and fixed to the building structure, It comprises a second fixing portion fixed to the reinforcing material fixing piece portion. A type of joinery characterized by its features.

3. A window frame comprising an upper frame, a lower frame, and left and right vertical frames, and a shoji screen, The aforementioned upper frame is, The upper frame body is attached to the building structure, The system includes an upper frame reinforcing member that is positioned between the frame and the upper frame body and fixed to the upper frame body, and which suppresses deformation of the upper frame body due to wind load applied to the sliding door, The upper frame body comprises an outdoor mounting piece attached to the outdoor surface of the building structure, an indoor mounting piece attached to the lower surface of the building structure on the indoor side of the outdoor mounting piece, and a reinforcing material fixing piece provided spaced apart from the lower surface of the building structure between the outdoor mounting piece and the indoor mounting piece. The aforementioned upper frame reinforcing member is A first fixing portion is arranged along the interior surface of the exterior mounting piece and fixed to the building structure, A second fixing portion fixed to the reinforcing material fixing piece, It comprises a contact portion that abuts against the lower surface of the aforementioned frame. A type of joinery characterized by its features.

4. A window frame comprising an upper frame, a lower frame, and left and right vertical frames, and a shoji screen, The aforementioned upper frame is, The upper frame body is attached to the building structure, The system includes an upper frame reinforcing member that is positioned between the frame and the upper frame body and fixed to the upper frame body, and which suppresses deformation of the upper frame body due to wind load applied to the sliding door, The indoor side of the aforementioned upper frame body is covered with an indoor cover material made of synthetic resin. The aforementioned upper frame body is, The cover material mounting piece to which the aforementioned interior cover material is attached, A reinforcing material fixing piece is positioned on the interior side and above the cover material mounting piece, and the upper frame reinforcing material is fixed to it. It comprises an indoor mounting piece positioned on the indoor side and above the reinforcing material fixing piece, and attached to the lower surface of the building structure. A type of joinery characterized by its features.

5. In the joinery described in claim 4, The aforementioned interior cover material is positioned spaced apart below the reinforcing material fixing piece, The upper frame reinforcing member is fixed to the reinforcing member fixing piece with screws. The portion of the screw that protrudes downward from the reinforcing material fixing piece is positioned in the space between the reinforcing material fixing piece and the interior cover material. A type of joinery characterized by its features.

6. In the joinery described in any one of claims 1 to 5, The upper frame and the lower frame are equipped with an outer rail and an inner rail, The aforementioned sliding door comprises an outer sliding door guided by the outer rail and an inner sliding door guided by the inner rail. A type of joinery characterized by its features.