Fixture, and design method of fixture

Abstract

To provide an environmentally friendly fixture.SOLUTION: A sliding window 1 includes a long right stile 60. The right stile 60 includes: an outdoor frame 61 formed of a metal material; an indoor frame 62 that is formed of a metal material and placed at the indoor side of the outdoor frame 61; and a bridge 63 that is placed between the outdoor frame 61 and the indoor frame 62 to connect the outdoor frame 61 and the indoor frame 62. When the right stile 60 is divided vertically into three equal parts; i.e. a first area A31, a second area A32, and a third area A33, the multiple regions include areas (second area A32 and third area A33) where the bridge 63 is more densely arranged, and an area (first area A1) where the bridge 63 is more sparsely arranged.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a building fitting and a design method thereof.

Background Art

[0002] Conventionally, from the viewpoints of energy saving, decarbonization, and low carbonization, building fittings with improved heat insulation performance have been desired. In contrast, there is known a building fitting having an indoor-side frame disposed on the indoor side spaced apart from each other and an outdoor-side frame disposed on the outdoor side, and a bridge member made of a resin having a low thermal conductivity is disposed between the indoor-side frame and the outdoor-side frame (see, for example, Patent Document 1). Since heat conduction between the indoor-side frame and the outdoor-side frame is blocked by this bridge member, excellent heat insulation performance can be obtained.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, the SDGs have become a global issue, and in the case of building materials products as well, the requirements for decarbonization and low carbonization and the requirements for resource recycling have been further increasing. For this reason, a building fitting that can be suitably heat-insulated and is more easily recyclable with the progress of resource recycling is desired. However, in the building fitting described in Patent Document 1, the bridge member is made of resin. Resin is desired to reduce the usage amount and replace it from the viewpoints of facilitating recycling and the like. Thus, the building fitting of Patent Document 1 has room for improvement in terms of environmental performance.

[0005] An object of the present disclosure is to provide a building fitting and a design method thereof having excellent environmental performance.

Means for Solving the Problems

[0006] The present disclosure relates to a fitting provided in an opening of a building, the fitting including a sash configured by framing a long member that is either a frame body or a mullion. The long member includes an outdoor frame portion formed of a metal material, an indoor frame portion provided on the indoor side of the outdoor frame portion and formed of a metal material, and a bridge portion provided between the outdoor frame portion and the indoor frame portion for connecting the outdoor frame portion and the indoor frame portion. When the long member is divided into a plurality of regions arranged in the longitudinal direction of the long member, the plurality of regions include a region where the bridge portion is more densely arranged and a region where the bridge portion is more sparsely arranged.

[0007] The present disclosure relates to a method for designing a fitting, including a step of deriving, by topology optimization, the arrangement of a region where the bridge portion in the long member is more densely arranged and a region where the bridge is more sparsely arranged.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0009] (First Embodiment) Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings.

[0010] As shown in FIG. 1, a sliding window 1 as a fitting is provided in an opening 11 formed in the outer wall of a building 10.

[0011] In this specification, the "vertical direction" refers to the up-and-down direction. The "left-right direction" refers to the left-right direction when the sliding window 1 is viewed from the indoor side. The "depth direction" refers to the indoor-outdoor direction in the sliding window 1. The "front direction" refers to the surface direction of the surface (for example, the glass 70) that can be seen forward when the sliding window 1 is viewed from the front. Also, the depth direction is also the depth direction of the sliding window 1. The front direction is also the up-down and left-right directions. The "front surface" refers to a surface that extends orthogonally to the indoor-outdoor direction and is arranged so as to face the indoor side and the outdoor side respectively. The "depth surface" refers to a surface that extends along the indoor-outdoor direction.

[0012] The sliding window 1 has a frame body 2 disposed at the opening peripheral edge of the opening 11 and a pair of shoji 3 and 8.

[0013] The frame body 2 has an upper frame 21, a lower frame 22, and a pair of left and right vertical frames 23. The upper frame 21, the lower frame 22, and each vertical frame 23 are framed in a rectangular shape. Note that the frame body 2 corresponds to a sash.

[0014] The pair of shoji 3 and 8 are disposed inside the frame body 2. The pair of shoji 3 and 8 are sliding shoji, and have an outer shoji 3 on the outdoor side and an inner shoji 8 on the indoor side. The pair of shoji 3 and 8 are slidable horizontally inside the frame body 2.

[0015] The outer shoji 3 has an upper frame 30, a lower frame 40, a pair of left and right vertical frames 50 and 60, and a plate-shaped glass 70 fitted inside the frames formed by these frames. Of the pair of vertical frames 50 and 60, the vertical frame 50 located on the left side may be referred to as the "left vertical frame 50", and the vertical frame 60 located on the right side may be referred to as the "right vertical frame 60".

[0016] The inner shoji 8 has an upper frame 81, a lower frame 82, a pair of left and right vertical frames 83 and 84, and a glass 85 fitted inside the frames formed by these frames. Of the pair of vertical frames 83 and 84, the vertical frame 83 located on the left side may be referred to as the "left vertical frame 83", and the vertical frame 84 located on the right side may be referred to as the "right vertical frame 84". The frame formed by the upper frame 81, the lower frame 82, and the pair of left and right vertical frames 83 and 84 corresponds to a sash.

[0017] Incidentally, when viewed from the indoor side, the outer shutter 3 is provided on the left side of the inner shutter 8. Therefore, the left vertical frame 50 and the right vertical frame 84 each serve as the door end frame, and the right vertical frame 60 and the left vertical frame 83 each serve as the mating frame. Further, the unlocking and locking members 9 for unlocking and locking the shutters 3 and 8 are provided on the right vertical frame 60 and the left vertical frame 83. The unlocking and locking member 9 is, for example, a crescent lock. Incidentally, the unlocking and locking member 9 corresponds to the restricting member.

[0018] Also, the upper frame 21, the lower frame 22, and each vertical frame 23 respectively correspond to the frame body and the long member. Each upper frame 30, 81, each lower frame 40, 82, and each vertical frame 50, 60, 83, 84 respectively correspond to the frame body and the long member. In the upper frame 21, the lower frame 22, each upper frame 30, 81, and each lower frame 40, 82, the left - right direction corresponds to the long direction, and in each vertical frame 23 and each vertical frame 50, 60, 83, 84, the up - down direction corresponds to the long direction. In this specification, the "long member" means any member of the frame body and the frame that constitutes the sash. In the following description, the upper frame 21, the lower frame 22, each vertical frame 23, each upper frame 30, 81, each lower frame 40, 82, and each vertical frame 50, 60, 83, 84 may simply be referred to as the "long member".

[0019] Subsequently, the configuration of each frame constituting the outer shutter 3 will be described. Incidentally, for each frame of the inner shutter 8 and each frame of the frame body 2, a configuration corresponding to each frame of the outer shutter 3 can also be adopted.

[0020] In the following description, the long member is divided into three equal parts in the longitudinal direction to form three regions. Among the three regions, the middle region is defined as the "first region", one of the end-side regions is defined as the "second region", and the other end-side region is defined as the "third region". The first region is a region including the central portion of the long member in the longitudinal direction. The second region and the third region are each a region on one end side of the long member in the longitudinal direction with respect to the first region, and are regions including the end portion on that one end side. Therefore, the first region corresponds to the first region in the claims, and the second region and the third region each correspond to the second region in the claims.

[0021] The first region, the second region, and the third region are each set as a straight columnar space extending in the longitudinal direction (see Fig. 2). The first region, the second region, and the third region include, for example, sides extending parallel to the prospective direction, have a longitudinal dimension that is the same as the maximum longitudinal dimension of the long member, a prospective dimension that is the same as the maximum prospective dimension of the long member, and a finding dimension that is the same as the maximum finding dimension of the long member. A straight quadrangular prism space extending in the longitudinal direction is set, and the space obtained by dividing the straight quadrangular prism space in the longitudinal direction is set as the space.

[0022] The right vertical frame 60 is divided into three equal parts in the longitudinal direction (vertical direction) to form three regions. Among the three regions, the middle region is defined as the first region A31, one of the end-side regions (specifically, the upper region) is defined as the second region A32, and the other end-side region (specifically, the lower region) is defined as the third region A33. The second region A32 and the third region A33 may be set in the reverse up-and-down order.

[0023] The left vertical frame 50 is divided into three equal parts in the vertical direction to form three regions. Among the three regions, the middle region is defined as the first region A21, the upper region is defined as the second region A22, and the lower region is defined as the third region A23. The second region A22 and the third region A33 may be set in the reverse up-and-down order.

[0024] Divide the upper frame 30 into three equal parts in the left-right direction to form three regions. Among these three regions, the middle region is designated as the first region A1, the left region is designated as the second region A2, and the right region is designated as the third region A3. The second region A2 and the third region A3 may be set in reverse left and right.

[0025] Divide the lower frame 40 into three equal parts in the left-right direction to form three regions. Among these three regions, the middle region is designated as the first region A11, the left region is designated as the second region A12, and the right region is designated as the third region A13. The second region A12 and the third region A13 may be set in reverse left and right.

[0026] As shown in FIG. 2, the right vertical frame 60 is divided into two parts in the indoor-outdoor direction, including an outdoor frame portion 61, an indoor frame portion 62 provided on the indoor side of the outdoor frame portion 61, and a bridge portion 63 provided between the outdoor frame portion 61 and the indoor frame portion 62 for connecting the outdoor frame portion 61 and the indoor frame portion 62.

[0027] Both the outdoor frame portion 61 and the indoor frame portion 62 are long frame members. Both the outdoor frame portion 61 and the indoor frame portion 62 are formed of a metal material, specifically, formed of aluminum.

[0028] Here, the configuration and arrangement mode of the bridge portion are optimized so that the strength of the long member can be efficiently ensured with a smaller amount of material. Hereinafter, the configuration of the bridge portion and the like will be described.

[0029] Incidentally, the density of the materials required for each part of the long member can be virtually determined by a commercially available analysis application. Regarding the method for designing the fitting, specifically, first, for the long member, an initial configuration is set. At this time, any configuration can be set as the initial configuration. Next, the long member with the initial configuration is divided into a plurality of meshes. Each mesh becomes a space where materials can be arranged. Next, by topology optimization, in the long member, an optimal arrangement of the region where the bridge parts are arranged more densely and the region where the bridges are arranged more sparsely is derived. More specifically, for each of the plurality of meshes, the optimal material amount of the bridge part is derived, and the configuration of the long member is optimized. At this time, for example, various functions are set to minimize the material amount of the bridge part while ensuring the required strength of the long member. Simplification of the shape of the long member, minimization of the number of parts of the long member, etc. may be set as optimization conditions. Thus, the configuration of the long member can be optimized. Further, stress analysis may be performed on the long member having the configuration derived by topology optimization. The configuration of the long member may be further changed based on the results of the stress analysis. Similarly, thermal analysis may be performed on the long member and the configuration of the long member may be changed.

[0030] Also, in this specification, among the plurality of regions obtained by dividing the long member in the longitudinal direction, the region where the value obtained by dividing the total mass of the bridge parts arranged in the region by the volume of the region is larger is the region where the bridges are arranged more densely, and the region where the value is smaller is the region where the bridges are arranged more sparsely.

[0031] The bridge part 63 has a truss structure part 64 formed in a truss shape. In the bridge part 63, the truss structure parts 64 are provided in pairs in the left-right direction. Each truss structure part 64 is configured by a plurality of beam parts 65 that connect the outdoor side frame part 61 and the indoor side frame part 62 being arranged in a truss shape. Each truss structure part 64 is formed of a metal material, specifically, aluminum.

[0032] A plurality of bridge portions 63 are arranged at intervals in the vertical direction, and specifically, four are provided.

[0033] In the first region A31, two bridge portions 63 are provided. The two bridge portions 63 are arranged at intervals in the middle part in the vertical direction of the first region A31. In the first region A31, the bridge portions 63 are not arranged in each region near each end in the vertical direction of the first region A31 and in the central part in the vertical direction of the first region A31.

[0034] In the second region A32, one bridge portion 63 is provided. The bridge portion 63 is arranged from the upper end of the second region A32 to the middle part of the lower part of the second region A32. In the second region A32, the bridge portion 63 is not arranged in the region near the lower end of the second region A32.

[0035] Also, in the second region A32, the truss structure of the bridge portion 63 has different longitudinal dimensions (vertical dimensions) of each triangle constituting the truss structure depending on the part. In the second region A32, the vertical dimensions of each triangle constituting the truss structure of the bridge portion 63 are smaller than those of other parts of the second region A32 near the central part in the vertical direction of the second region A32. For this reason, in the second region A32, the bridge portions 63 are arranged more densely in the vicinity of the central part in the vertical direction of the second region A32 than in other parts of the second region A32.

[0036] The total mass of the bridge portions 63 arranged in the second region A32 is larger than the total mass of the bridge portions 63 arranged in the first region A31. For this reason, in the right vertical frame 60, the bridge portions 63 are arranged more densely in the second region A32 than in the first region A31. In other words, when the right vertical frame 60 is divided into a plurality of regions (the first region A31 and the second region A32) arranged in the vertical direction, the plurality of regions have a region (the second region A32) where the bridge portions 63 are arranged more densely and a region (the first region A31) where the bridge portions 63 are arranged more sparsely.

[0037] The third region A33 is provided with one bridge portion 63. The right vertical frame 60 has a symmetrical configuration in the up-down direction. Therefore, in the right vertical frame 60, the configuration of the third region A33 portion is a configuration obtained by inverting the configuration of the second region A32 portion in the up-down direction. That is, the total mass of the bridge portions 63 arranged in the third region A33 is greater than the total mass of the bridge portions 63 arranged in the first region A31. Therefore, in the right vertical frame 60, the bridge portions 63 are arranged more densely in the third region A33 than in the first region A31. A detailed description of the configuration of the bridge portions 63 in the third region A33 is omitted.

[0038] Furthermore, by using the above-described topology optimization, the portion where the bridge portions are arranged can be considered to be a portion of the elongated member that requires a relatively high strength, and the portion where the bridge portions are arranged more densely can be considered to be a portion of the elongated member that requires a higher strength.

[0039] Therefore, the middle part of the first region A31, the second region A32, and the third region A33 are considered to be parts of the right vertical frame 60 that require relatively high strength. The second region A32 and the third region A33 are considered to be parts of the right vertical frame 60 that require especially high strength.

[0040] In addition, it is considered that the part of the right vertical frame 60 where the locking / unlocking member 9 is arranged is likely to be subjected to external forces. The locking / unlocking member 9 is arranged in the first area A31. Therefore, it is preferable that the first area A31 is reinforced. In addition, when an opening / closing mechanism or part arrangement is provided as in the case of the long member in this case, it is considered preferable that the bridge portion is arranged in a key position near the opening / closing mechanism, etc., even if it is not at the end in the longitudinal direction. It is possible to confirm which part of the fitting is likely to be subjected to external forces by using commercially available analysis software.

[0041] In the right vertical frame 60, bridge portions 63 are arranged in regions where these high strengths are required, and in regions where particularly high strength is required among these regions, the bridge portions 63 are arranged more densely. Thereby, the strength of the long member is ensured. On the other hand, among the right vertical frame 60, in regions where relatively low strength is required, the bridge portions 63 are either arranged more sparsely than the regions where strength is required in the right vertical frame 60 or not arranged at all. Thereby, the material amount of the bridge portions is reduced. In this way, by providing a difference in density in the material amount of the bridge portions for each part of the long member, it is possible to provide a long member capable of reducing the material amount while ensuring sufficient strength. Therefore, it is possible to provide a fitting with excellent environmental performance.

[0042] Further, the bridge portions 63 are formed of metal, and the entire right vertical frame 60 is formed of metal. Metals can be easily recycled. Thereby, the environmental performance of the fitting can be further improved.

[0043] Note that a heat insulating material may be provided in the region between the outdoor side frame portion 61 and the indoor side frame portion 62. Thereby, heat transfer between the indoor and outdoor can be further suppressed. In that case, for example, the heat insulating material is provided at the intermediate portion in the longitudinal direction of each beam portion 65, and each beam portion 65 is divided at its intermediate portion in the longitudinal direction and connected via the heat insulating material. The heat insulating material is, for example, a small piece formed of a material having heat insulating properties. However, the shape of the heat insulating material is not particularly limited and can be appropriately selected according to required qualities and the like. For example, the heat insulating material may be formed in a long shape. Also, the heat insulating material may be arranged in a space surrounded by the outdoor side frame portion 61, the indoor side frame portion 62, and the truss structure portion 64 that is paired in the left-right direction. In that case, for example, the heat insulating material is a heat insulating material containing an aerogel component. In this way, the heat insulating material does not necessarily have high strength by itself, and the degree of freedom in selecting the heat insulating material is extremely high. The type of the heat insulating material is not particularly limited and can be appropriately selected.

[0044] The left vertical frame 50, the upper frame 30, and the lower frame 40 each have a configuration that generally corresponds to the right vertical frame 60. Hereinafter, the configurations of the left vertical frame 50, the upper frame 30, and the lower frame 40 will be described with a focus on the differences from the right vertical frame 60.

[0045] The left vertical frame 50 further has a swing prevention member 54 on its door end side. Also, the left vertical frame 23 has a rail (not shown) that protrudes toward the outer shutter 3 side. The swing prevention member 54 has a groove portion (not shown) that is open on the left side. At least a part of the rail is accommodated in the groove portion. Thereby, the swing of the outer shutter 3 can be suppressed. Note that the swing prevention member 54 corresponds to a restricting member.

[0046] Two swing prevention members 54 are provided at intervals in the vertical direction. Of the two swing prevention members 54, one is provided in the second region A22 and the other is provided in the third region A23. The swing prevention member is a member that restricts the movement of the shutter. In the long member, an external force acts particularly strongly at the location where the swing prevention member is provided.

[0047] The bridge portion 53 of the left vertical frame 50 is provided at least in the second region A22 and the third region A23. In the left vertical frame 50, the bridge portion 53 is disposed at a position that is the same as the portion where the swing prevention member 54 is provided in the vertical direction. Thereby, in the long member, at the location where the swing prevention member is provided and where an external force tends to act particularly strongly, that location can be reinforced.

[0048] Note that in the long member, the region in the middle portion in the longitudinal direction is considered to be a region where less strength is required compared to the end regions. Also, in the case of the left vertical frame 50, members that restrict the movement of the shutter, such as a locking and unlocking member and a swing prevention member, are not disposed in the first region A21. For this reason, in the left vertical frame 50, the mass of the bridge portion 53 disposed in the first region A21 can be set to be relatively small. In that case, it is possible to reduce the amount of material of the bridge portion while avoiding insufficient strength of the long member.

[0049] The upper frame 30 is different from the right vertical frame 60 in that the longitudinal direction is the left - right direction. Also, similar to the left vertical frame 50 and the left - hand vertical frame member 23, the upper frame 30 further has two anti - swing members 34 (corresponding to the restricting members). The upper frame 21 has a rail (not shown in the figure) protruding toward the outer shutter 3 side. Of each of the anti - swing members 34, one is provided in the second region A2 and the other is provided in the third region A3.

[0050] The bridge portion 33 of the upper frame 30 is provided at least in the second region A2 and the third region A3. In the upper frame 30, the bridge portion 33 is disposed at a position where the position in the left - right direction is the same as the portion where the anti - swing member 34 is provided.

[0051] The lower frame 40 is different from the right vertical frame 60 in that the longitudinal direction is the left - right direction. The lower frame 40 further has door wheels 44. Two door wheels 44 are provided at intervals in the left - right direction. Of the two door wheels 44, one is provided in the second region A12 and the other is provided in the third region A13.

[0052] The bridge portion 43 of the lower frame 40 is provided at least in the second region A12 and the third region A13. In the lower frame 40, the bridge portion 43 is disposed at a position where the position in the left - right direction is the same as the portion where the door wheel 44 is provided. Thus, at a location where a door wheel is provided in the long member, where an external force tends to act particularly greatly, the said location can be reinforced.

[0053] Note that the positions where the anti - swing members 34, 54 and the door wheels 44 are provided in the shutter are not limited to the above - mentioned positions and can be changed as appropriate.

[0054] Further, the total mass of the bridge portion 63 of the right vertical frame 60 is the largest among the total mass of the bridge portion 33 of the upper frame 30, the total mass of the bridge portion 43 of the lower frame 40, the total mass of the bridge portion 53 of the left vertical frame 50, and the total mass of the bridge portion 63 of the right vertical frame 60. Thus, it is considered that the frame is a frame that particularly requires high strength among the frames of the shoji provided in the sliding window, and the calling frame can be reinforced. Further, by relatively reducing the bridge portions of the frames other than the calling frame, the amount of heat insulating material used in the shoji can be reduced. Thereby, a shoji excellent in environmental performance can be provided.

[0055] According to the present embodiment, the following effects are achieved.

[0056] According to the present embodiment, when the right vertical frame 60 is divided into a plurality of regions arranged in the vertical direction, the plurality of regions include a region where the bridge portions 63 are arranged more densely and a region where the bridge portions 63 are arranged more sparsely. For example, in the second region A32, the bridge portions 63 are arranged more densely than in the first region A31.

[0057] It is considered that there are portions where high strength is required and portions where relatively low strength is required in the long member. Therefore, by providing a difference in density in the amount of material of the bridge portion for each part of the long member, the long member can be efficiently reinforced. Specifically, in the right vertical frame 60, in the region where high strength is required, the bridge portions 63 are arranged more densely to improve the strength of the right vertical frame 60, and in the region where relatively low strength is required, the bridge portions 63 are arranged more sparsely to reduce the amount of material of the bridge portions 63. Thereby, the amount of material can be reduced while ensuring sufficient strength.

[0058] Therefore, a fitting excellent in environmental performance can be provided.

[0059] According to the present embodiment, for example, the right vertical frame 60 includes an outdoor side frame portion 61 formed of a metal material, an indoor side frame portion 62 provided on the indoor side of the outdoor side frame portion 61 and formed of a metal material, and a bridge portion 63 provided between the outdoor side frame portion 61 and the indoor side frame portion 62 to connect the outdoor side frame portion 61 and the indoor side frame portion 62. A plurality of bridge portions of the right vertical frame 60 are provided at intervals in the vertical direction.

[0060] Thereby, the material amount of the bridge portion 63 can be reduced as compared with the case where the bridge portion 63 is arranged over the entire vertical direction of the right vertical frame 60. Therefore, it is possible to provide a fitting having excellent environmental performance.

[0061] Further, in a region where the bridge portion 63 is not arranged, heat transfer between the indoor and outdoor can be suppressed. Thereby, the heat insulation performance of the long member can be improved. Also, in a region where the bridge portion 63 is arranged, since the structure of the bridge portion 63 is a truss structure and the material amount of the bridge portion 63 is small within a range capable of ensuring the strength of the right vertical frame 60, heat transfer between the indoor and outdoor is suppressed.

[0062] According to the present embodiment, the total mass of the bridge portions 63 arranged in the first region A31 and the total mass of the bridge portions 63 arranged in the second region A32 are different from each other.

[0063] Thereby, in the first region A31 and the second region A32, where different strengths are considered to be required, the bridge portions 63 can be arranged more densely in the region where higher strength is required, and the bridge portions 63 can be arranged more sparsely in the region where lower strength is required. Thereby, while ensuring the strength of the long member, the material amount of the bridge portion can be reduced, so that it is possible to provide a fitting having excellent environmental performance.

[0064] Further, in a region where the bridge portions are arranged more sparsely, heat transfer between the indoor and outdoor can be suppressed. Thereby, the heat insulation performance of the long member can be improved.

[0065] According to the present embodiment, the bridge portion 53 is disposed at a portion of the left vertical frame 50 where the position in the vertical direction is the same as the portion where the anti-sway member 54 is provided.

[0066] Thus, in the long member, at a location where a member that can limit the movement of a shoji such as an anti-sway member is provided, since an external force tends to act particularly strongly, the location can be reinforced.

[0067] According to the present embodiment, the bridge portion 43 is disposed at a portion of the lower frame 40 where the position in the left-right direction is the same as the portion where the door wheel 44 is provided.

[0068] Thus, in the long member, at a location where a door wheel is provided, since an external force tends to act particularly strongly, the location can be reinforced.

[0069] (First Modification Example of the First Embodiment) Hereinafter, a first modification example of the first embodiment of the present disclosure will be described. Hereinafter, the description will focus on the differences from the first embodiment. The description of the same configuration as the first embodiment may be omitted.

[0070] In this modification example, the configuration of the long member is different from that of the first embodiment. Hereinafter, the left vertical frame 100 will be described as an example. Note that the left vertical frame 100 corresponds to a frame body and a long member.

[0071] As shown in FIG. 3, the bridge portion 130 of the left vertical frame 100 includes a first rod-shaped member 131, a second rod-shaped member 132, a third rod-shaped member 133, a fourth rod-shaped member 134, and a fifth rod-shaped member 135. Note that the first rod-shaped member 131, the second rod-shaped member 132, the third rod-shaped member 133, the fourth rod-shaped member 134, and the fifth rod-shaped member 135 may be collectively referred to as "each rod-shaped member 131, 132, 133, 134, 135".

[0072] Each of the rod-shaped members 131, 132, 133, 134, and 135 has an elongated shape extending in the vertical direction. The longitudinal dimension of each of the rod-shaped members 131, 132, 133, 134, and 135 is smaller than 1 / 3 of the longitudinal dimension of the left vertical frame 100. For example, the longitudinal dimensions of the first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 are each 1 / 5 of the longitudinal dimension of the left vertical frame 100. The longitudinal dimensions of the fourth rod-shaped member 134 and the fifth rod-shaped member 135 are each 1 / 4 of the longitudinal dimension of the left vertical frame 100. However, the longitudinal dimensions of the first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 are not limited to 1 / 5 of the longitudinal dimension of the left vertical frame 100. The longitudinal dimensions of the fourth rod-shaped member 134 and the fifth rod-shaped member 135 are not limited to 1 / 4 of the longitudinal dimension of the left vertical frame 100.

[0073] The first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 are all formed of a heat-insulating material, for example, bamboo. However, it is not limited thereto, and the first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 may be formed of, for example, carbon fiber reinforced plastic (CFRP). The material forming the first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 preferably has a thermal conductivity of 0.3 W / (m·K) or less, and more preferably 0.25 W / (m·K) or less.

[0074] The fourth rod-shaped member 134 and the fifth rod-shaped member 135 are both bolts. The fourth rod-shaped member 134 and the fifth rod-shaped member 135 are formed of a metal material, for example, aluminum. In this case, the strength of the left vertical frame 100 can be improved. However, it is not limited thereto, and the fourth rod-shaped member 134 and the fifth rod-shaped member 135 may be formed of, for example, resin. By forming the fourth rod-shaped member 134 and the fifth rod-shaped member 135 of a material with low thermal conductivity, the heat insulation performance can be improved.

[0075] Note that the material forming the rod-shaped member is preferably not a petroleum-derived material. When the material forming the rod-shaped member is a resin, the resin is preferably a non-petroleum-based material or a recycled material. In that case, the environmental performance of the long member can be improved.

[0076] The outdoor frame portion 110 of the left vertical frame 100 has outdoor extension pieces 111 that extend indoors from the outdoor frame portion 110. A plurality of outdoor extension pieces 111 are provided at intervals in the longitudinal direction of the left vertical frame 100. The outdoor extension pieces 111 are formed integrally with the outdoor frame portion 110 from, for example, a metal material.

[0077] The outdoor frame portion 110 has a plurality of outdoor holes 112 that penetrate each of the outdoor extension pieces 111 in the vertical direction. The outdoor holes 112 include a first outdoor hole 114 and a second outdoor hole 115 that are arranged side by side in the prospective direction in each outdoor extension piece 111. In each outdoor extension piece 111, the first outdoor hole 114 is provided on the indoor side of the second outdoor hole 115.

[0078] The indoor frame portion 120 of the left vertical frame 100 has indoor extension pieces 121 that extend outdoors from the indoor frame portion 120. A plurality of indoor extension pieces 121 are provided at intervals in the longitudinal direction of the left vertical frame 100. The indoor extension pieces 121 are formed integrally with the indoor frame portion 120 from, for example, a metal material.

[0079] The indoor frame portion 120 has a plurality of indoor holes 122 that penetrate each of the indoor extension pieces 121 in the vertical direction. The indoor holes 122 include a first indoor hole 124 and a second indoor hole 125 that are arranged side by side in the prospective direction in each indoor extension piece 121. In each indoor extension piece 121, the first indoor hole 124 is provided on the indoor side of the second indoor hole 125.

[0080] The outdoor extension pieces 111 (outdoor holes 112) and the indoor extension pieces 121 (indoor holes 122) are arranged alternately, for example, in the vertical direction.

[0081] The left vertical frame 100 is divided into three equal parts in the vertical direction to form three regions. Among these three regions, the middle region is designated as the first region A51, the upper region is designated as the second region A52, and the lower region is designated as the third region A53.

[0082] In the first region A51, a first rod-shaped member 131 is disposed. The first rod-shaped member 131 passes through the first outdoor side hole portion 114 and the first indoor side hole portion 124. Note that no rod-shaped member is disposed in the second outdoor side hole portion 115 and the second indoor side hole portion 125. Thereby, heat transfer between the indoor and outdoor is suppressed. Also, it is possible to dispose a rod-shaped member in the second outdoor side hole portion 115 and the second indoor side hole portion 125. In that case, the strength of the left vertical frame 100 can be improved.

[0083] In the second region A52, a second rod-shaped member 132 and a fourth rod-shaped member 134 are disposed. The second rod-shaped member 132 passes through the first outdoor side hole portion 114 and the first indoor side hole portion 124. The fourth rod-shaped member 134 passes through the second outdoor side hole portion 115 and the second indoor side hole portion 125.

[0084] In the third region A53, a third rod-shaped member 133 and a fifth rod-shaped member 135 are disposed. The third rod-shaped member 133 passes through the first outdoor side hole portion 114 and the first indoor side hole portion 124. The fifth rod-shaped member 135 passes through the second outdoor side hole portion 115 and the second indoor side hole portion 125.

[0085] The first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 are arranged at intervals in the vertical direction. The fourth rod-shaped member 134 and the fifth rod-shaped member 135 are arranged at intervals in the vertical direction. In this case, in the left vertical frame 100, a plurality of bridge portions 130 are provided at intervals in the vertical direction. Thereby, the amount of material of the bridge portion 130 can be reduced as compared with the case where the bridge portion 130 is provided over the entire vertical region of the left vertical frame 100.

[0086] The total mass of the bridge part 130 disposed in the first region A51 (i.e., the mass of the first rod-shaped member 131) is smaller than the total mass of the bridge part 130 disposed in the second region A52 (i.e., the sum of the mass of the second rod-shaped member 132 and the mass of the fourth rod-shaped member 134). Further, the total mass of the bridge part 130 disposed in the first region A51 is smaller than the total mass of the bridge part 130 disposed in the third region A53 (i.e., the sum of the mass of the third rod-shaped member 133 and the mass of the fifth rod-shaped member 135).

[0087] Thereby, in the second region A52 and the third region A53, which are regions where particularly high strength is required among the long members, the rod-shaped members can be arranged more densely to improve the strength of the long members. In the first region A51, which is a region where strength is not required compared to the second region A52 and the third region A53, the rod-shaped members can be arranged more sparsely to reduce the amount of material of the rod-shaped members.

[0088] Note that the rod-shaped members do not necessarily have to be arranged at each end in the vertical direction of the left vertical frame 100 as long as the strength of the left vertical frame 100 can be ensured. Further, the rod-shaped members arranged at each end in the vertical direction of the left vertical frame 100 do not necessarily have to be bolts, and may be round bars without screw grooves. A rod-shaped member that is a bolt and a rod-shaped member that is a round bar may be arranged at each end in the vertical direction of the left vertical frame 100.

[0089] The first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 are each formed of a material having heat insulation properties. Thereby, heat transfer between the indoor and outdoor can be suppressed.

[0090] The fourth rod-shaped member 134 and the fifth rod-shaped member 135 are each formed of aluminum. Thereby, the strength of the second region A52 and the third region A53 can be further improved. Further, the fourth rod-shaped member 134 and the fifth rod-shaped member 135 can be easily recycled.

[0091] The number of outdoor side holes 112 arranged in the first area A51 is preferably smaller than the number of outdoor side holes 112 arranged in the second area A52. The number of outdoor side holes 112 and indoor side holes 122 arranged in the first area A51 and inserted through the rod-shaped members 131, 132, 133, 134, 135 is preferably smaller than the number of outdoor side holes 112 and indoor side holes 122 arranged in the second area A52 and inserted through the rod-shaped members 131, 132, 133, 134, 135.

[0092] In the first area A51, the smaller of the contact area between the rod-shaped member (specifically, the first rod-shaped member 131) and the outdoor side hole 112 and the contact area between the rod-shaped member (specifically, the first rod-shaped member 131) and the indoor side hole 122 is defined as the first contact area. In the second area A52, the smaller of the contact area between the rod-shaped members (the second rod-shaped member 132 and the fourth rod-shaped member 134) and the outdoor side hole 112 and the contact area between the rod-shaped members (the second rod-shaped member 132 and the fourth rod-shaped member 134) and the indoor side hole 122 is defined as the second contact area. When this is the case, the first contact area is preferably smaller than the second contact area. Thereby, in the second area A52, the strength of the long member can be improved, and in the first area A51, the heat insulation performance of the long member can be improved. Therefore, it is possible to more efficiently suppress heat transfer between indoors and outdoors while ensuring the strength of the long member, and thus it is easier to ensure the strength and heat insulation performance of the long member while reducing the size of the bridge portion.

[0093] In addition, the indoor side frame portion 120 has, on the indoor side thereof, a recessed portion 127 that is recessed toward the outdoor side. Return portions that protrude from the inner peripheral surface of the recessed portion 127 are provided at each end on the indoor side of the inner peripheral surface of the recessed portion 127.

[0094] The left vertical frame 100 has a cover member 128 attached to the indoor side of the indoor side frame portion 120. The cover member 128 has a rectangular plate shape, and has a covering portion 128a whose plate surface extends parallel to the finding direction, and a pair of left and right engaging protrusions 128b that are formed as a pair, extend from the covering portion 128a to the outdoor side, and have returns at the outdoor side ends.

[0095] The covering portion 128a and the indoor side frame portion 120 have substantially the same vertical dimension and horizontal dimension. The covering portion 128a covers the entire indoor side frame portion 120 when viewed from the indoor side. The covering portion 128a is formed of, for example, wood. Thereby, the design property when the left vertical frame 100 is viewed from the indoor side can be enhanced. Note that the covering portion 128a does not necessarily have to be formed of wood, and may be formed of, for example, metal or resin. When the covering portion 128a is formed of metal, the strength of the left vertical frame 100 can be further improved. However, the covering portion 128a is preferably formed of a material with high design property.

[0096] The covering portion 128a covers the recessed portion 127 from the outdoor side. For this reason, an indoor side space portion 129 is formed by being surrounded by the recessed portion 127 and the covering portion 128a. For example, a heat insulating material (not shown) is disposed in the indoor side space portion 129. In that case, the heat insulating performance of the left vertical frame 100 can be further improved.

[0097] Each engaging protrusion 128b is engaged with the return portion of the recessed portion 127. Thereby, the cover member 128 is attached to the indoor side frame portion 120. Note that the cover member 128 can be easily removed from the indoor side frame portion 120 by releasing the engagement between each engaging protrusion 128b and the return portion of the recessed portion 127. For this reason, even when a heat insulating material is disposed in the indoor side space portion 129, it can be easily disassembled and separated.

[0098] According to this modification, the following effects are obtained.

[0099] According to this modification example, the bridge portion 130 of the left vertical frame 100 has rod-shaped members 131, 132, 133, 134, 135 extending in the vertical direction. The outdoor side frame portion 110 has an outdoor side hole portion 112, and the indoor side frame portion 120 has an indoor side hole portion 122. Each of the rod-shaped members 131, 132, 133, 134, 135 passes through the outdoor side hole portion 112 and the indoor side hole portion 122, respectively.

[0100] Thereby, the bridge portion 130 can connect the outdoor side frame portion 110 and the indoor side frame portion 120 by the respective rod-shaped members 131, 132, 133, 134, 135, and can improve the strength of the long member.

[0101] Since each of the rod-shaped members 131, 132, 133, 134, 135 can be relatively small, the amount of material of the bridge portion can be reduced.

[0102] Thereby, while ensuring the strength and heat insulation performance of the long member, the amount of material of the bridge portion can be reduced, so that a fitting with excellent environmental performance can be provided.

[0103] In addition, the contact area between each of the rod-shaped members 131, 132, 133, 134, 135 and the outdoor side hole portion 112 or the indoor side hole portion 122 is relatively small. Thereby, the heat transfer area in the bridge portion 130 can be reduced, so that the heat insulation performance of the long member can be improved.

[0104] According to this modification example, the first rod-shaped member 131, the second rod-shaped member 132, and the third rod-shaped member 133 are arranged at intervals in the vertical direction. The fourth rod-shaped member 134 and the fifth rod-shaped member 135 are arranged at intervals in the vertical direction. In this case, in the left vertical frame 100, a plurality of bridge portions 130 are provided at intervals in the vertical direction.

[0105] Thereby, in the left vertical frame 100, the amount of material of the bridge portion 130 can be reduced as compared with the case where the bridge portion 130 is provided over the entire vertical range of the left vertical frame 100.

[0106] According to this modification example, the total mass of the bridge portion 130 disposed in the first region A51 (i.e., the mass of the first rod-shaped member 131) is smaller than the total mass of the bridge portion 130 disposed in the second region A52 (i.e., the sum of the mass of the second rod-shaped member 132 and the mass of the fourth rod-shaped member 134). Further, the total mass of the bridge portion 130 disposed in the first region A51 is smaller than the total mass of the bridge portion 130 disposed in the third region A53 (i.e., the sum of the mass of the third rod-shaped member 133 and the mass of the fifth rod-shaped member 135).

[0107] Thereby, in the second region A52 and the third region A53, which are regions where relatively high strength is required in the left vertical frame 100, more rod-shaped members can be arranged to improve the strength of the long member. In the first region A51, which is a region where strength is not required compared to the second region A52 and the third region A53, fewer rod-shaped members can be arranged to reduce the material amount of the bridge portion (rod-shaped member).

[0108] The left vertical frame 100 has a cover member 128 attached to the indoor side of the indoor side frame portion 120.

[0109] Thereby, the design property of the long member viewed from the indoor side can be improved.

[0110] (Second Modification Example of the First Embodiment) Hereinafter, a second modification example of the first embodiment of the present disclosure will be described. Hereinafter, the description will focus on the differences from the first embodiment. The description of the same configuration as the first embodiment may be omitted.

[0111] In this modification example, the configuration of the long member is different from that of the first embodiment. As shown in FIG. 4, in the long member 150 of this modification example, the bridge portion 157 has a plurality of expanded metals 158.

[0112] Each expandable metal 158 is formed of a metallic material. Each expandable metal 158 has a thin plate shape with a mesh structure.

[0113] Each expandable metal 158 is respectively disposed between the outdoor frame portion 151 and the indoor frame portion 154. Each expandable metal 158 is respectively disposed with its plate surface along the expected direction. Each expandable metal 158 is provided at intervals in the longitudinal direction of the long member 150.

[0114] The outdoor frame portion 151 has, for example, an outdoor extension piece (not shown) extending indoors from its indoor surface. The indoor frame portion 154 has, for example, an indoor extension piece (not shown) extending outdoors from its outdoor surface. In that case, each expandable metal 158 is arranged such that, among the respective end portions in its left - right direction, one end portion abuts against the outdoor extension piece and the other end portion abuts against the indoor extension piece.

[0115] Each expandable metal 158 is respectively fixed to the outdoor frame portion 151 and the indoor frame portion 154 by, for example, clips (not shown). In that case, the clips sandwich together the expandable metal 158, the outdoor extension piece, and the indoor extension piece. Thereby, the outdoor frame portion 151 and the indoor frame portion 154 are connected via the expandable metal 158.

[0116] Each expandable metal 158 respectively has a plurality of bending portions 158a. Each expandable metal 158 is bent in an arc shape at the bending portion 158a and is curved in a wave shape as a whole. The plurality of bending portions 158a are arranged side by side in the longitudinal direction of the long member 150. However, the bending method of the expandable metal 158 is not limited to this. The expandable metal 158 may be bent at the bending portion, or may be, for example, pleated as a whole. Note that the expandable metal 158 may be formed in a flat plate shape. In other words, the bending portion 158a is not an essential configuration.

[0117] Further, a plurality of expandable metals 158 may be arranged side by side in the expected direction. In that case, the arrangement density of the bridge portion 157 (expandable metal 158) can be increased at the location where the plurality of expandable metals 158 overlap in the expected direction.

[0118] Also, a plurality of expandable metals 158 may not be arranged at intervals in the vertical direction. For example, the bridge portion 157 may have an expandable metal 158 extending over the entire longitudinal direction of the long member 150. In that case, the bridge portion 63 may have only one expandable metal 158. In such a bridge portion 63 (expandable metal 158), the density can be adjusted by adjusting the interval between the bending portions 158a and the magnitude of the bend at each bending portion 158a.

[0119] According to this modification, the following effects are achieved.

[0120] According to this modification, the plurality of expandable metals 158 are provided at intervals in the longitudinal direction of the long member 150. Thereby, the material amount of the bridge portion can be reduced as compared with the case where the expandable metal 158 is provided over the entire longitudinal direction of the long member 150.

[0121] According to this modification, the expandable metal 158 is formed of a metal material. Thereby, the use of petroleum-derived products can be suppressed.

[0122] According to this modification, the expandable metal 158 has a mesh shape. Thereby, since the heat transfer area of the expandable metal 158 is relatively small, heat transfer through the bridge portion 157 can be suppressed.

[0123] According to this modification example, each expandable metal 158 has a plurality of bent portions 158a. By bending the expandable metal 158, the expandable metals 158 can be arranged more densely around the bent portions 158a, so that the strength of the long member 150 can be improved.

[0124] Note that the intervals between the bent portions 158a and the magnitudes of the bends at the bent portions 158a may vary depending on the part of the expandable metal 158. When the long member 150 is divided into three equal parts in the longitudinal direction of the long member 150 and divided into three regions, among the three regions, the number of bent portions 158a located in the middle region is preferably smaller than the number of bent portions 158a located in one of the end regions. Thereby, in the long member 150, in the region where higher strength is required, the expandable metals 158 are arranged more densely to improve the strength of the long member 150, and in the region where relatively low strength is required, the expandable metals 158 are arranged more sparsely to suppress heat transfer between indoors and outdoors.

[0125] Further, the expandable metal 158 may be, for example, a punching metal having a plurality of holes. Similar to the bent portions 158a of the expandable metal 158, the arrangement density of the holes formed in the punching metal may vary depending on the part.

[0126] Also, the bridge portion 157 may not have the expandable metal 158. When it is considered that sufficient strength of the long member 150 can be ensured, the bridge portion 157 may be composed only of a clamping member such as a clip, and the outdoor side frame portion 151 and the indoor side frame portion 154 may be connected only by the clamping member. Thereby, the configuration of the long member can be further simplified and the amount of material of the bridge portion can be reduced.

[0127] As described above, the preferred embodiments of the present disclosure have been described. However, the present disclosure is not limited to the above-described embodiments and can be appropriately changed.

[0128] In each of the above embodiments, the bridge portions were arranged in the first region, the second region, and the third region. However, the bridge portions do not necessarily have to be arranged in the first region. If the strength of the long member can be sufficiently ensured, the total mass of the bridge portions arranged in the first region may be 0. However, it is preferable that the bridge portions are arranged in at least the second region. Further, when a restricting member or a shutter wheel is attached to the first region, it is preferable that the bridge portions are arranged in the first region.

[0129] In the above embodiment, the fitting was a sliding window, but it is not limited thereto. The fitting may be, for example, another type of window such as a vertical-sliding window, or may be provided at an opening through which people enter and exit.

[0130] In the above embodiment, the restricting member was a locking and unlocking member and an anti-sway member, but it is not limited thereto. For example, the restricting member may be a stay or the like that supports the opening and closing operation of a vertically-sliding shoji. Further, when the restricting member is provided on the long member constituting the frame body 2, it is preferable that the bridge portions are arranged at portions where the restricting member is provided and at portions where the positions in the longitudinal direction are the same among the long members.

[0131] In the above embodiment, when the long member was divided in the longitudinal direction into a plurality of regions, the long member was divided into three equal parts, but it does not necessarily have to be divided equally. That is, the first region and the second region do not necessarily have to have the same dimension in the longitudinal direction. Further, the first region does not necessarily have to include the central portion in the longitudinal direction. Further, the second region does not necessarily have to include the end portion on one end side. Further, the long member may be divided into two regions or four or more regions.

[0132] In the above embodiment, the first region and the second region were each set as a rectangular parallelepiped space, but the present invention is not limited to this. However, it is preferable that the bottom areas of the first region and the second region are the same. In that case, by comparing the value obtained by dividing the total mass of the bridge portions arranged in the region by the dimension in the longitudinal direction of the region, it is possible to easily compare the density of the bridge portions in each region.

[0133] [Aspect 1] A fitting provided at an opening of a building, comprising a sash formed by framing a long member which is either a frame body or a mullion body, the long member including an outdoor side frame portion formed of a metal material, an indoor side frame portion provided on the indoor side of the outdoor side frame portion and formed of a metal material, and a bridge portion provided between the outdoor side frame portion and the indoor side frame portion for connecting the outdoor side frame portion and the indoor side frame portion, with the longitudinal direction of the long member being the longitudinal direction, and when the long member is divided into a plurality of regions arranged in the longitudinal direction, the plurality of regions include a region where the bridge portions are arranged more densely and a region where the bridge portions are arranged more sparsely. [Aspect 2] The fitting according to Aspect 1, wherein a plurality of the bridge portions are provided at intervals in the longitudinal direction. [Aspect 3] When a region including the central portion in the longitudinal direction of the long member is defined as the first region, and a region on one end side of the first region and including the end portion on the one end side is defined as the second region, the value obtained by dividing the total mass of the bridge portions arranged in the first region by the volume of the first region and the value obtained by dividing the total mass of the bridge portions arranged in the second region by the volume of the second region are different from each other. The fitting according to Aspect 1 or 2. [Aspect 4] The first region is the central region among the three regions obtained by equally dividing the long member in the longitudinal direction. The second region is the region on one end side among the three regions obtained by equally dividing the long member in the longitudinal direction. The total mass of the bridge portions arranged in the first region is smaller than the total mass of the bridge portions arranged in the second region. The fitting according to aspect 1 or 2. [Aspect 5] The bridge portion has a rod-shaped member extending in the longitudinal direction. The outdoor side frame portion has an outdoor side hole portion. The indoor side frame portion has an indoor side hole portion. The rod-shaped member passes through the outdoor side hole portion and the indoor side hole portion. The fitting according to any one of aspects 1 to 4. [Aspect 6] The long member has a cover member attached to the indoor side of the indoor side frame portion. The fitting according to any one of aspects 1 to 5. [Aspect 7] The fitting includes a shoji screen. The long member has a restricting member capable of restricting the movement of the shoji screen. In the long member, the bridge portion is arranged at a portion where the position in the longitudinal direction is the same as the portion where the restricting member is provided. The fitting according to any one of aspects 1 to 6. [Aspect 8] The long member has a door wheel. In the long member, the bridge portion is arranged at a portion where the position in the longitudinal direction is the same as the portion where the door wheel is provided. The fitting according to any one of aspects 1 to 7. [Aspect 9] A method for designing the fitting according to claim 1 or 2, including a step of deriving, by topology optimization, the arrangement of a region where the bridge portions are more densely arranged and a region where the bridge portions are more sparsely arranged in the long member. A method for designing a fitting.

Explanation of symbols

[0134] 1: Staggered window (fitting), 2: Frame body (sash), 3: Inner shutter (shutter), 8: Outer shutter (shutter), 10: Building, 11: Opening, 21: Upper frame (frame body and long member), 22: Lower frame (frame body and long member), 23: Vertical frame (frame body and long member), 30: Upper sill (sill body and long member), 34, 54: Anti-sway member (restriction member), 40: Lower sill (sill body and long member), 44: Door wheel, 50: Left vertical sill (sill body and long member), 60: Right vertical sill (sill body and long member), 61, 110, 151: Outdoor side frame part, 62, 120, 154: Indoor side frame part, 63, 130, 157: Bridge part, 100: Left vertical sill (sill body and long member), 112, 114, 115: Outdoor side hole part, 122, 124, 125: Indoor side hole part, 128: Cover member, 131: First rod-shaped member, 132: Second rod-shaped member, 133: Third rod-shaped member, 134: Fourth rod-shaped member, 135: Fifth rod-shaped member, 150: Long member, A1, A11, A21, A31, A51: First region, A2, A12, A22, A32, A52: Second region, A3, A13, A23, A33, A53: Third region.

Claims

1. A fitting provided at an opening of a building, comprising a sash formed by framing a long member which is either a frame body or a mullion, wherein the long member has an outdoor frame portion formed of a metal material, an indoor frame portion provided on the indoor side of the outdoor frame portion and formed of a metal material, and a bridge portion provided between the outdoor frame portion and the indoor frame portion for connecting the outdoor frame portion and the indoor frame portion, wherein when the longitudinal direction of the long member is defined as the long dimension direction and the long member is divided into a plurality of regions arranged in the long dimension direction, the plurality of regions include a region where the bridge portions are more densely arranged and a region where the bridge portions are more sparsely arranged.

2. The fitting according to claim 1, wherein a plurality of the bridge portions are provided at intervals in the long dimension direction.

3. When a region including the central portion in the long dimension direction of the long member is defined as a first region and a region on one end side of the first region and including the end portion on the one end side is defined as a second region, a value obtained by dividing the total mass of the bridge portions arranged in the first region by the volume of the first region and a value obtained by dividing the total mass of the bridge portions arranged in the second region by the volume of the second region are different from each other.

4. The first region is a central region among three regions obtained by trisecting the long member in the long dimension direction, the second region is an end region among three regions obtained by trisecting the long member in the long dimension direction, and the total mass of the bridge portions arranged in the first region is smaller than the total mass of the bridge portions arranged in the second region.

5. The bridge portion has a rod-shaped member extending in the long dimension direction, the outdoor frame portion has an outdoor side hole portion, the indoor frame portion has an indoor side hole portion, and the rod-shaped member passes through the outdoor side hole portion and the indoor side hole portion.

6. The long member has a cover member attached to the indoor side of the indoor frame portion.

7. A shoji screen is provided, the long member has a limiting member capable of restricting the movement of the shoji screen, and the bridge portions are arranged at positions where the portion provided with the limiting member and the portion having the same position in the long dimension direction of the long member are the same.

8. ​ The long member has a door wheel, The fitting according to claim 1 or 2, wherein the bridge portion is disposed at a portion of the long member where the position in the longitudinal direction is the same as the portion where the door wheel is provided.

9. A method for designing a fitting according to claim 1 or 2, A method for designing a fitting, comprising a step of deriving an arrangement of a region where the bridge portion is more densely arranged and a region where the bridge portion is more sparsely arranged in the long member by topology optimization.

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