Construction tool

Abstract

To provide a fitting with improved heat insulation.SOLUTION: A fitting comprises a frame 10, an inner shoji 20A arranged on the indoor side of the frame 10, and an outer shoji 20B arranged on the outdoor side of the frame 10. In a lower frame 11 of the frame 10, an indoor building material element 11A located on the indoor side, an outdoor building material element 11B located on the outdoor side, and an intermediate building material element 11C located between the indoor building material element 11A and the outdoor building material element 11B are separated from each other in the depth direction, and further, the indoor building material element 11A and the intermediate building material element 11C and the outdoor building material element 11B and the intermediate building material element 11C are connected by heat insulating materials 60A and 60B, respectively. The intermediate building material element 11C is smaller than the outdoor building material element 11B and the indoor building material element 11A in the depth dimension of the inner peripheral surface of the frame 10. The outdoor building material element 11B is positioned such that an indoor-side edge portion 42 on the inner peripheral surface of the frame 10 overlaps the outer shoji 20B in the depth direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a building fixture including an inner shutter disposed on the indoor side of a frame body and an outer shutter disposed on the outdoor side of the frame body, and more particularly to a structure for improving heat insulation performance.

Background Art

[0002] As a heat insulation structure of this type of building fixture, there is one in which three building material elements separated from each other are connected by a heat insulating material. That is, the lower frame is divided into three parts in the expected direction with the slide groove for guiding the slide of the inner shutter and the slide groove for guiding the slide of the outer shutter as boundaries, and the three divided building material elements are connected to each other by a heat insulating material respectively (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, the intermediate building material element sandwiched between the slide groove of the inner shutter and the slide groove of the outer shutter is located indoors and outdoors respectively when the inner shutter and the outer shutter are closed. That is, when the inner shutter and the outer shutter are closed, the intermediate building material element is located indoors rather than the outer shutter on the outer shutter side, but the entire width in the expected direction is located outdoors rather than the inner shutter on the inner shutter side. Therefore, for example, when the portion of the intermediate building material element located outdoors on the inner shutter side rises in temperature due to solar radiation or the like, the influence of this temperature rise directly reaches indoors on the outer shutter side, which is not necessarily preferable in consideration of the heat insulation performance of the building fixture.

[0005] In view of the above circumstances, an object of the present invention is to provide a fitting capable of improving heat insulation performance.

Means for Solving the Problems

[0006] To achieve the above object, a fitting according to the present invention is a fitting including a frame body, an inner shutter disposed on the indoor side of the frame body, and an outer shutter disposed on the outdoor side of the frame body, wherein the building material constituting the frame body includes an indoor building material element located on the indoor side, an outdoor building material element located on the outdoor side, and an intermediate building material element located between the indoor building material element and the outdoor building material element, which are arranged side by side in the prospective direction in a separated state from each other, and the space between the indoor building material element and the intermediate building material element and the space between the outdoor building material element and the intermediate building material element are each connected by a heat insulating material. The intermediate building material element along the prospective direction is configured to have a smaller size than the outdoor building material element and the indoor building material element, and the outdoor building material element is characterized in that the indoor-side edge portion on the inner peripheral surface of the frame body is located on the indoor side rather than in the prospective direction wherein the outer shutter more on the indoor side.

Effects of the Invention

[0007] According to the present invention, heat transfer to the interior through the intermediate building material element can be suppressed by setting a small size in the prospective direction, and heat transfer to the interior through the outdoor building material element can be suppressed by the interposition of two heat insulating materials in the heat transfer path. Therefore, even if either the intermediate building material element or the outdoor building material element is arranged from the outside to the inside, it is possible to improve the heat insulation performance of the fitting.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] Hereinafter, preferred embodiments of the fitting according to the present invention will be described in detail with reference to the accompanying drawings. Incidentally, hereinafter, the terms "prospective direction" and "search direction" may be used for convenience. The prospective direction is the direction along the depth of the fitting as indicated by arrow A in the figure. A surface along the prospective direction may be referred to as a prospective surface. The search direction is the direction along the up and down perpendicular to the prospective direction in the case of something extending along the horizontal direction such as a lower frame. In the case of something extending along the vertical direction such as a vertical frame, the horizontal direction perpendicular to the prospective direction is referred to as the search direction. A surface along the search direction may be referred to as a search surface.

[0010] (Embodiment 1) FIGS. 1 and 2 show a fitting according to Embodiment 1 of the present invention. The fitting exemplified here is a sliding window called a double-hung window including a frame body 10, an inner shutter 20A disposed on the indoor side of the frame body 10, and an outer shutter 20B disposed on the outdoor side of the frame body 10. The frame body 10 is configured by forming a four-sided frame assembly with an upper frame (not shown), a lower frame (building material) 11, and left and right vertical frames 12, 13. The inner shutter 20A and the outer shutter 20B move using rail portions 11a, 11b provided on the lower frame 11 of the frame body 10 as guides, and are configured by attaching an upper frame (not shown), a lower frame 22, and left and right vertical frames 23, 24 to the four sides of, for example, glass 21 having a rectangular shape.

[0011] The lower frame 11 of the frame body 10 includes an indoor building material element 11A located on the indoor side, an outdoor building material element 11B located on the outdoor side, and an intermediate building material element 11C located between the indoor building material element 11A and the outdoor building material element 11B. These building material elements 11A, 11B, and 11C are configured by arranging them side by side in the prospective direction. The indoor building material element 11A, the outdoor building material element 11B, and the intermediate building material element 11C are extruded profiles formed of a metal such as an aluminum alloy, and are configured such that the portions along the entire length in the longitudinal direction each have a substantially uniform cross-sectional shape. In the first embodiment, a rail portion (hereinafter referred to as the inner rail portion 11a when distinguishing) for guiding the inner shutter 20A is provided on the indoor building material element 11A, and a rail portion (hereinafter referred to as the outer rail portion 11b when distinguishing) for guiding the outer shutter 20B is provided on the outdoor building material element 11B.

[0012] More specifically, as shown in FIGS. 1 and 3, the indoor building material element 11A is integrally formed with an inner main plate portion 31 having a thin plate shape extending along the prospective direction, and an inner rail portion 11a extending from the edge on the outdoor side of the inner main plate portion 31 toward the inner peripheral side of the frame body 10. The dimension of the indoor building material element 11A along the prospective direction is set such that the position of the edge 32 on the outdoor side of the inner peripheral surface of the frame body 10 overlaps with the lower frame 22 of the inner shutter 20A disposed on the inner rail portion 11a in the prospective direction. Two inner support fin portions 33, 34 for supporting the lower frame 11 on the upper surface of the window sill MD extend downward on the inner main plate portion 31.

[0013] The outdoor building material element 11B is integrally formed by an outer main part 41 having a hollow shape with a square cross-section and an outer rail part 11b extending inward from the central part of the surface on the inner peripheral side of the frame body 10 in the outer main part 41. The height of the outer rail part 11b is substantially the same as the height of the inner rail part 11a. The dimension along the prospective direction of the outdoor building material element 11B is slightly larger than that of the indoor building material element 11A, and the position of the edge part 42 on the indoor side of the inner peripheral surface of the frame body 10 is set to overlap with the lower frame 22 of the outer shutter 20B disposed on the outer rail part 11b in the prospective direction. At the lower corner part located on the indoor side in the outer main part 41, a nail fin part 43 for fixing the lower frame 11 to the surface facing the outside of the window sill MD extends toward the outer peripheral side.

[0014] The intermediate building material element 11C has a partition part 51 formed in a thin plate shape extending along the vertical direction, and is configured such that the dimension along the prospective direction is smaller than that of the indoor building material element 11A. In the illustrated example, the intermediate building material element 11C is configured to have a dimension in the prospective direction with only support claw parts 70, which will be described later, provided on both side surfaces of the partition part 51. At the lower edge part of the partition part 51, an intermediate support fin part 52 for supporting the lower frame 11 on the upper surface of the window sill MD extends downward. The position of the lower edge of the intermediate support fin part 52 is substantially the same as the position of the lower edges of the inner support fin parts 33 and 34 provided on the indoor building material element 11A.

[0015] Between the indoor building material element 11A and the intermediate building material element 11C, and between the outdoor building material element 11B and the intermediate building material element 11C, they are connected only by heat insulating materials 60A and 60B in a state of being separated from each other. The heat insulating materials 60A and 60B have a substantially horizontally long rectangular cross-section, and are joined to the respective building material elements 11A, 11B, and 11C without gaps in a state where the left and right both end parts are fitted between the support claw parts 70. The support claw parts 70 protrude in a direction approaching each other from the upper edge part and the lower edge part of the parts facing each other between the indoor building material element 11A and the intermediate building material element 11C, and between the outdoor building material element 11B and the intermediate building material element 11C.

[0016] In the interior building material element 11A, the inner peripheral surface of the support claw portion 70 provided on the inner peripheral side of the frame body 10 and the inner peripheral surface of the support claw portion 70 provided on the inner peripheral side of the frame body 10 on the indoor side of the intermediate building material element 11C are located on substantially the same plane, and the inner peripheral surface 61a of the heat insulating material (hereinafter referred to as the inner heat insulating material 60A when distinguishing) between them is provided so as to be on substantially the same plane as the inner peripheral surface of the support claw portion 70. In the inner heat insulating material 60A, the dimension along the expected direction of the inner peripheral surface 61a exposed between the support claw portion 70 of the interior building material element 11A and the support claw portion 70 of the intermediate building material element 11C is set to be smaller than the dimension along the expected direction of the inner blind 20A and larger than the dimension along the expected direction of the inner peripheral surface in the intermediate building material element 11C. In the exterior building material element 11B, the inner peripheral surface of the support claw portion 70 provided on the inner peripheral side of the frame body 10 and the inner peripheral surface of the support claw portion 70 provided on the inner peripheral side of the frame body 10 on the outdoor side of the intermediate building material element 11C are located on substantially the same plane, and the inner peripheral surface 61b of the heat insulating material (hereinafter referred to as the outer heat insulating material 60B when distinguishing) between them is provided so as to be on substantially the same plane as the inner peripheral surface of the support claw portion 70. In the outer heat insulating material 60B, the dimension along the expected direction of the inner peripheral surface 61b exposed between the support claw portion 70 of the exterior building material element 11B and the support claw portion 70 of the intermediate building material element 11C is substantially the same as the dimension along the expected direction of the inner heat insulating material 60A. As is clear from the figure, the support claw portion 70 of the intermediate building material element 11C constitutes a stepped portion 53 by protruding more toward the inner peripheral side than the one provided on the outdoor side of the one provided on the indoor side. An engaging claw 53a is provided on the upper edge portion of the stepped portion 53 so as to protrude toward the outside.

[0017] As a method of forming the lower frame 11 described above, for example, first, a lower frame material in which three building material elements 11A, 11B, and 11C are integrated is formed of an aluminum alloy. That is, a lower frame material having a shape in which the support claw portions 70 on the outer peripheral side are connected to each other between the indoor building material element 11A and the intermediate building material element 11C, and the support claw portions 70 on the outer peripheral side are connected to each other between the intermediate building material element 11C and the outdoor building material element 11B is formed. The molten heat insulating materials 60A and 60B are filled between the building material elements 11A, 11B, and 11C of this lower frame material and hardened. Thereafter, if the connected support claw portions 70 on the outer peripheral side are cut by a cutting tool, it becomes possible to form the lower frame 11 having the above-described configuration. In the lower frame 11 described above, since the inner peripheral surfaces 61a and 61b of the heat insulating materials 60A and 60B are exposed at the portion that becomes the inner peripheral surface of the frame body 10, it is possible to easily perform the work when filling in the molten state.

[0018] A cover member 80 is attached between the outer rail portion 11b and the inner rail portion 11a of this lower frame 11. The cover member 80 is integrally formed with a flat plate-shaped cover body 80a having dimensions capable of covering the space from the outer rail portion 11b to the inner rail portion 11a, and two support leg portions 80b and 80c protruding from the lower surface of the cover body 80a. This cover member 80 engages the indoor support leg portion 80b with the engaging claw 53a of the stepped portion 53 provided on the intermediate building material element 11C, and engages the outdoor support leg portion 80c with the engaging protrusion 11c provided at the base end portion of the outer rail portion 11b, whereby the cover body 80a is detachably attached to the lower frame 11 in a state of covering the inner heat insulating material 60A and the outer heat insulating material 60B.

[0019] According to the fitting provided with the lower frame 11 configured as described above, since the two heat insulating materials 60A and 60B are interposed in parallel in the prospective direction, the dimension along the prospective direction of the heat insulating materials 60A and 60B is substantially increased, which is advantageous in terms of heat insulation. Moreover, as for each of the heat insulating materials 60A and 60B, the dimension along the prospective direction does not become large, and even when the lower frame 11 is configured by curing the heat insulating materials 60A and 60B in a molten state as in the method described above, a situation where the shrinkage amount of the heat insulating materials 60A and 60B increases is not caused. Therefore, there is no possibility of generating a gap due to shrinkage between the building material elements 11A, 11B, 11C and the heat insulating materials 60A and 60B, and there is no concern about impairing the watertightness and airtightness of the fitting.

[0020] Furthermore, in the intermediate building material element 11C, the dimension in the prospective direction on the inner peripheral surface of the frame body 10 is smaller than that of the outdoor building material element 11B and the indoor building material element 11A, and in the outdoor building material element 11B, the indoor-side edge portion on the inner peripheral surface of the frame body 10 overlaps with the lower frame 22 of the outer shutter 20B in the prospective direction. Thereby, in a state where the inner shutter 20A and the outer shutter 20B are closed, the area of the portion of the intermediate building material element 11C located outside the lower frame 22 of the inner shutter 20A and the area of the portion located inside the lower frame 22 of the outer shutter 20B can be set to be small. Therefore, for example, even if the portion of the intermediate building material element 11C located outside the lower frame 22 of the inner shutter 20A is heated by solar radiation or the like, heat transfer to the interior through the intermediate building material element 11C can be suppressed, and it becomes possible to improve the heat insulation.

[0021] In the above-described Embodiment 1, since the two heat insulating materials 60A and 60B are provided between the inner rail portion 11a and the outer rail portion 11b, it is possible to improve the heat insulation without significantly increasing the dimension along the prospective direction of the lower frame 11. However, the present invention is not limited to this, and for example, as in Embodiment 2 described later, it is also possible to provide the inner heat insulating material 60A on the indoor side of the inner rail portion 11a.

[0022] (Embodiment 2) Figures 4 and 5 show the fittings according to Embodiment 2 of the present invention. The fittings exemplified here are, like those of Embodiment 1, a sliding window comprising a frame body 10, an inner shutter 20A disposed on the indoor side of the frame body 10, and an outer shutter 20B disposed on the outdoor side of the frame body 10, and are different from those of Embodiment 1 in the positions of the heat insulating materials 60A and 60B provided on the lower frame 11 and the position of the inner rail portion 11a that guides the inner shutter 20A. That is, in the lower frame 11 of Embodiment 2, the inner rail portion 11a is provided in the intermediate building material element 11C, and the inner heat insulating material 60A is provided in a portion on the indoor side of the inner rail portion 11a of the intermediate building material element 11C.

[0023] More specifically described, as shown in FIG. 6, the indoor building material element 11A has an inner main plate portion 91 formed in a thin plate shape extending along the prospective direction. The dimension of the indoor building material element 11A along the prospective direction is set such that the position of the edge portion on the outdoor side of the inner peripheral surface of the frame body 10 overlaps with the inner shutter 20A disposed on the inner rail portion 11a in the prospective direction. On the inner main plate portion 91, an inner support fin portion 92 for supporting the lower frame 11 on the upper surface of the window sill MD extends downward from the edge portion on the indoor side.

[0024] The outdoor building material element 11B is integrally formed by an outer main portion 101 having a hollow shape with a deformed cross section and an outer rail portion 11b extending from the central portion of the surface on the inner peripheral side of the outer main portion 101 toward the inner peripheral side. The height of the outer rail portion 11b is substantially the same as the height of the inner rail portion 11a. The dimension of the outdoor building material element 11B along the prospective direction is larger than that of the indoor building material element 11A, and the position of the edge portion 102 on the indoor side of the inner peripheral surface of the frame body 10 is set to be on the indoor side of the lower frame 22 of the outer shutter 20B disposed on the outer rail portion 11b in the prospective direction. At the lower corner portion located on the indoor side of the outer main portion 101, a nail fin portion 103 for fixing the lower frame 11 to the surface facing the outdoor of the window sill MD extends toward the outer peripheral side.

[0025] The intermediate building material element 11C is integrally formed by a partition wall portion 111 in the shape of a thin plate extending along the vertical direction and an inner rail portion 11a extending from the inner peripheral surface of the partition wall portion 111 toward the inner peripheral side of the frame body 10, and is configured such that the dimension along the prospective direction is smaller than that of the interior building material element 11A. In the illustrated example, the intermediate building material element 11C is configured such that the dimension in the prospective direction is only the dimension with support claw portions 70 provided on both side surfaces of the partition wall portion 111. An intermediate support fin portion 112 for supporting the lower frame 11 on the upper surface of the window sill MD extends downward at the lower edge portion of the partition wall portion 111. The position of the lower edge of the intermediate support fin portion 112 is substantially the same as the position of the lower edge of the inner support fin portion 92 provided on the interior building material element 11A.

[0026] The configuration of the inner heat insulating material 60A connecting between the interior building material element 11A and the intermediate building material element 11C and the outer heat insulating material 60B connecting between the exterior building material element 11B and the intermediate building material element 11C is the same as that in the first embodiment. The configuration of the support claw portions 70 provided on each of the building material elements 11A, 11B, 11C is also the same as that in the first embodiment. However, the stepped portion 104 and the engaging claw 104a with which the support leg portion 80b of the cover member 80 engages are provided on the exterior building material element 11B.

[0027] According to the fitting provided with the lower frame 11 configured as described above, since the two heat insulating materials 60A, 60B are interposed in the prospective direction, the dimension along the prospective direction of the heat insulating materials 60A, 60B is substantially increased, which is advantageous in terms of heat insulation. Moreover, as for each of the heat insulating materials 60A, 60B, the dimension along the prospective direction does not become large, and even when the heat insulating materials 60A, 60B in the molten state are cured to form the lower frame 11 as described above, a situation where the shrinkage amount of the heat insulating materials 60A, 60B increases is not caused. Therefore, there is no possibility of generating a gap due to shrinkage between the building material elements 11A, 11B, 11C and the heat insulating materials 60A, 60B, and there is no concern about impairing the watertightness and airtightness of the fitting.

[0028] Furthermore, for the intermediate building material element 11C, the dimension in the prospective direction on the inner peripheral surface of the frame body 10 is smaller than those of the outdoor building material element 11B and the indoor building material element 11A. For the outdoor building material element 11B, the inner-side edge portion 42 on the inner peripheral surface of the frame body 10 is located on the indoor side of the lower frame 22 of the outer shutter 20B in the prospective direction. As a result, as shown in FIG. 2, in a state where the inner shutter 20A and the outer shutter 20B are closed, the intermediate building material element 11C does not appear outdoors. For the outdoor building material element 11B, although there is a portion located on the indoor side of the lower frame 22 of the outer shutter 20B, not only can the dimension along the prospective direction be set small, but also two heat insulators 60A and 60B are interposed in the heat transfer path to the room. Therefore, for example, even if the portion of the outdoor building material element 11B located outdoors of the lower frame 22 of the inner shutter 20A has its temperature increased by solar radiation or the like, heat transfer from the outdoor building material element 11B to the room can be suppressed, and it becomes possible to improve the heat insulation performance.

[0029] In addition, in the above-described Embodiment 1 and Embodiment 2, only the lower frame has been described, but it goes without saying that the present invention can also be applied to the upper frame and the vertical frame.

[0030] As described above, the fitting according to the present invention is a fitting including a frame body, an inner shutter disposed on the indoor side of the frame body, and an outer shutter disposed on the outdoor side of the frame body. The building material constituting the frame body includes an indoor building material element located on the indoor side, an outdoor building material element located on the outdoor side, and an intermediate building material element located between the indoor building material element and the outdoor building material element, which are arranged side by side in the prospective direction in a separated state from each other, and the space between the indoor building material element and the intermediate building material element and the space between the outdoor building material element and the intermediate building material element are each connected by a heat insulator. The intermediate building material element is configured such that the dimension in the prospective direction on the inner peripheral surface of the frame body is smaller than those of the outdoor building material element and the indoor building material element. The outdoor building material element is characterized in that the inner-side edge portion on the inner peripheral surface of the frame body overlaps with the outer shutter in the prospective direction or is located on the indoor side of the outer shutter. According to the present invention, heat transfer into the room through the intermediate building material element can be suppressed by setting a small dimension in the prospective direction, and heat transfer into the room through the outdoor building material element can be suppressed by interposing two heat insulating materials in the heat transfer path. Therefore, even if either the intermediate building material element or the outdoor building material element is arranged from the outside to the inside of the room, it is possible to improve the heat insulation performance as a fitting.

[0031] Further, the present invention is characterized in that, in the fitting described above, the surface of the heat insulating material on the inner peripheral side of the frame body is provided without a step between the adjacent indoor building material element, outdoor building material element, and intermediate building material element. According to the present invention, since the heat insulating material is directly exposed on the surface on the inner peripheral side of the frame body, for example, when the molten heat insulating material is cured to form a building material, the filling work of the heat insulating material becomes easy, and thus the manufacturing work can be facilitated.

[0032] Further, the present invention is characterized in that, in the fitting described above, the intermediate building material element has a partition portion at a position between the heat insulating materials, and the heat insulating material between the outdoor building material element and the intermediate building material element abuts on one surface of the partition portion, and the heat insulating material between the indoor building material element and the intermediate building material element abuts on the other surface of the partition portion. According to the present invention, the dimension along the prospective direction of the intermediate building material element can be set small, and heat transfer through the intermediate building material element can be significantly suppressed.

[0033] Further, the present invention is characterized in that, in the fitting described above, both the outer sash and the inner sash move using the rail portion of the lower frame constituting the frame body as a guide, and the heat insulating material between the indoor building material element and the intermediate building material element is provided at a position outside the rail portion that guides the inner sash. According to the present invention, since two heat insulating materials are provided between the rail portions, it is possible to suppress an increase in the dimension in the prospective direction of the building material and improve the heat insulation performance.

[0034] Moreover, in the fitting described above, both the inner shutter and the outer shutter move with the rail portion of the lower frame constituting the frame body as a guide, and the heat insulating material between the indoor building material element and the intermediate building material element is provided at a position on the indoor side of the rail portion that guides the inner shutter. According to this invention, since the heat insulating material is provided in a portion on the indoor side of the rail portion of the inner shutter, it is possible to suppress heat transfer through the inner shutter and its rail portion.

[0035] Moreover, in the fitting described above, a stepped portion is provided on the inner peripheral surface of the frame body of the outdoor building material element or the intermediate building material element such that the indoor side is higher than the outdoor side, and a cover member supported by the building material by engaging with the stepped portion is provided at a position covering the heat insulating material between the outdoor building material element and the intermediate building material element. According to this invention, it is possible to prevent a situation where the heat insulating material is directly exposed by the cover member, which is advantageous in terms of appearance quality.

Explanation of Reference Numerals

[0036] 10 Frame body, 11 Lower frame, 11A Indoor building material element, 11B Outdoor building material element, 11C Intermediate building material element, 11a Inner rail portion, 11b Outer rail portion, 20A Inner shutter, 20B Outer shutter, 42, 102 Edges of outdoor building material element, 51, 111 Partition portion, 53, 104 Stepped portion, 60A Inner heat insulating material, 60B Outer heat insulating material, 80 Cover member

Claims

1. A fitting comprising a frame body, an inner shutter disposed on the indoor side of the frame body, and an outer shutter disposed on the outdoor side of the frame body, wherein the building materials constituting the frame body are arranged side by side in the prospective direction in a state where an indoor building material element located on the indoor side, an outdoor building material element located on the outdoor side, and an intermediate building material element located between the indoor building material element and the outdoor building material element are separated from each other, and the space between the indoor building material element and the intermediate building material element and the space between the outdoor building material element and the intermediate building material element are each connected by a heat insulating material, the intermediate building material element is configured to have a dimension along the prospective direction smaller than that of the outdoor building material element and the indoor building material element, the outdoor building material element is characterized in that the indoor-side edge portion on the inner peripheral surface of the frame body is located on the indoor side of the outer shutter in the prospective direction.

2. The fitting according to claim 1, wherein the surface of the heat insulating material on the inner peripheral side of the frame body is provided without a step between the adjacent indoor building material element, outdoor building material element, and intermediate building material element.

3. The intermediate building material element has a partition portion at a position between the heat insulating materials, and the heat insulating material between the outdoor building material element and the intermediate building material element abuts on one surface of the partition portion, and the heat insulating material between the indoor building material element and the intermediate building material element abuts on the other surface of the partition portion. The fitting according to claim 1 is characterized by this.

4. Both the outer shutter and the inner shutter move using the rail portion of the lower frame constituting the frame body as a guide, and the heat insulating material between the indoor building material element and the intermediate building material element is provided at a position on the indoor side of the rail portion that guides the inner shutter. The fitting according to claim 3 is characterized by this.

5. A step portion is provided on the outdoor building material element or the intermediate building material element such that the indoor side is higher than the outdoor side on the inner peripheral surface of the frame body, and a cover member supported by the building material is provided at a position covering the heat insulating material between the outdoor building material element and the intermediate building material element by engaging with the step portion. The fitting according to claim 1 is characterized by this.

Images