Inspection hatches and insulation installation methods

Abstract

To improve workability of a thermal insulation material by performing a construction of the thermal insulation material without depending on a size of a fixed frame as much as possible.SOLUTION: An inspection port (10) of the present invention is provided at an attic of a ceiling plate (12) or at the underfloor of a floor plate (12) and comprises a rectangular fixed frame (22) arranged along an opening (14) at the ceiling plate (12) or the floor plate (12) and a thermal insulation material (26) arranged at the fixed frame (22) in a rectangular frame shape and constituted of a plurality of segments (S). At least three segments (S) are arranged at each side part (22m) of the fixed frame (22).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inspection hatch for inspecting the space above a ceiling panel or under a floor panel, and to a method for installing insulation material in a rectangular frame shape in a rectangular fixed frame used in the inspection hatch. [Background technology]

[0002] In order to inspect wiring or piping, etc., arranged above the ceiling panels or below the floorboards of a building, an inspection hatch having the following configuration, for example, may be installed in the ceiling panels or floorboards (see Patent Documents 1 and 2).

[0003] That is, a rectangular opening is formed in the ceiling or floor panel, and an outer frame is provided around the periphery of the opening in the ceiling or floor panel. A lid member that opens and closes the opening in the ceiling or floor panel is provided on the ceiling or floor panel. A rectangular outer insulation unit that prevents outside air from entering the room through the opening in the ceiling or floor panel is provided above the ceiling panel or below the floor. The outer insulation unit includes a fixed frame that is arranged along the opening in the ceiling or floor panel, and insulation material that is arranged in a rectangular frame shape on the fixed frame. A rectangular inner insulation unit that prevents outside air from entering the room through the opening in the ceiling or floor panel is detachably provided inside the outer insulation unit.

[0004] In addition to Patent Documents 1 and 2, prior art related to the present invention includes those shown in Patent Documents 3 and 4. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-245973 [Patent Document 2] Japanese Patent Application Publication No. 11-131782 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-73556 [Patent Document 4] Japanese Patent Application Laid-Open No. 2007-198059 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the external insulation units for inspection hatches according to the prior art, the installation of the insulation material often depends on the size of the fixing frame, which means that it is necessary to prepare insulation material according to the size of the fixing frame, which makes it difficult to improve the installability of the insulation material, in other words, the installability of the inspection hatch.

[0007] Therefore, one aspect of the present invention aims to improve the ease of installation of insulation, in other words, the ease of installation of inspection hatches, by installing insulation without relying as much as possible on the size of the fixed frame. [Means for solving the problem]

[0008] In order to solve the above problem, one embodiment of the present invention provides an inspection hatch that is provided above the ceiling or below the floor, and includes a rectangular fixed frame that is arranged along an opening formed in the ceiling or floor, and an insulating material that is arranged in a rectangular frame shape on the fixed frame and is made up of a plurality of segments, with at least three or more of the segments arranged on each side of the fixed frame.

[0009] In the inspection hatch, the abutting surfaces (adjacent surfaces) of two adjacent segments at right angles at each corner of the fixed frame may be inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

[0010] In the inspection hatch, the multiple segments that make up the insulation material may be classified into first terminal segments located on one end side of each side of the fixed frame, second terminal segments located on the other end side of each side of the fixed frame, and intermediate segments arranged between the first terminal segments and the second terminal segments on each side of the fixed frame.

[0011] In the inspection hatch, the abutment surfaces (adjacent surfaces) of each adjacent first terminal segment and intermediate segment may each be inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame, and the abutment surfaces of each adjacent second terminal segment and intermediate segment may each be inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

[0012] In the inspection hatch, the first terminal segment, the second terminal segment, and the intermediate segment may be arranged point-symmetrically with respect to the center of gravity of the fixed frame.

[0013] In the inspection hatch, each segment may be a long segment whose both ends are located at the corners of the fixed frame.

[0014] In the inspection hatch, an engagement protrusion may be formed on the abutment surface of one of the two segments that are adjacent at right angles at each corner of the fixed frame, and an engagement hole may be formed on the abutment surface of the other segment for engaging the engagement protrusion of one of the segments.

[0015] In the inspection hatch, the multiple segments that make up the insulation material may be classified into L-shaped segments that are arranged at each corner of the fixed frame and are L-shaped, and intermediate segments that are arranged between two of the L-shaped segments on each side of the fixed frame.

[0016] In the inspection hatch, the abutting surfaces of each adjacent L-shaped segment and each intermediate segment may be inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

[0017] In the inspection hatch, a rectangular frame-shaped recess may be formed in the fixed frame, and each segment may be fitted into or engaged with the recess of the fixed frame.

[0018] In the inspection hatch, the heat insulating material may be made of a polyethylene-based resin foam or a polyolefin-based resin foam having an expansion ratio of 10 times or more and less than 100 times.

[0019] In addition, in order to solve the above-mentioned problem, a method of installing insulation material according to one embodiment of the present invention is a method of installing insulation material for arranging insulation material in a rectangular frame shape in a rectangular fixed frame used in the inspection hatch, in which a first terminal segment, an intermediate segment, and a second terminal segment are sequentially attached to a first side of the fixed frame, then the first terminal segment, the intermediate segment, and the second terminal segment are sequentially attached to a second side adjacent to the first side of the fixed frame at a right angle, and further the first terminal segment, the intermediate segment, and the second terminal segment are sequentially attached to a third side adjacent to the second side of the fixed frame at a right angle, after which the first terminal segment is attached to one end side of a fourth side adjacent to the third side and the first side of the fixed frame at a right angle, and the second terminal segment is attached to the other end side of the fourth side of the fixed frame, and the intermediate segment is pushed and installed between the first terminal segment and the second terminal segment at the fourth side of the fixed frame. [Effects of the Invention]

[0020] According to one aspect of the present invention, by installing the insulation material without depending as much as possible on the size of the fixing frame, the installability of the insulation material, in other words, the installability of the inspection hatch, can be improved. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic plan view or bottom view of a large inspection hatch according to embodiment 1. FIG. [Figure 2] 1 is a schematic bottom or plan view of a large external insulation unit according to a first embodiment. FIG. [Figure 3] 1 is a schematic bottom view or plan view of a small inspection hatch according to embodiment 1. FIG. [Figure 4] 1 is a schematic bottom or plan view of a small-sized outer insulation unit according to a first embodiment. FIG. [Figure 5] 1 is a schematic bottom view or plan view of a large external insulation unit according to a first embodiment. FIG. [Figure 6] 1 is a schematic bottom or plan view of a small-sized outer insulation unit according to a first embodiment. FIG. [Figure 7] 1 is a schematic bottom view or plan view of a small-sized outer insulation unit according to a first modified example of the first embodiment. FIG. [Figure 8] 10 is a schematic plan view or bottom view of a large external insulation unit according to a second variant of the first embodiment. FIG. [Figure 9] FIG. 10 is a schematic bottom or plan view of an outer insulation unit according to an aspect of embodiment 2. [Figure 10] 10 is a schematic bottom view or plan view of an outer insulation unit according to a first modified example of the second embodiment. FIG. [Figure 11] 10 is a schematic bottom or plan view of an outer insulation unit according to an aspect of embodiment 3. FIG. [Figure 12] 10 is a schematic bottom view or plan view of an outer insulation unit according to a first modified example of the third embodiment. FIG. [Figure 13] FIG. 10 is a schematic diagram illustrating a method for applying a heat insulating material according to a fourth embodiment. [Figure 14] FIG. 10 is a schematic diagram illustrating a method for applying a heat insulating material according to a fourth embodiment. [Figure 15] FIG. 10 is a schematic diagram illustrating a method for applying a heat insulating material according to a fourth embodiment. [Figure 16] FIG. 10 is a schematic diagram illustrating a method for applying a heat insulating material according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The inspection hatch installed above the ceiling panel and the inspection hatch installed below the floor panel will be described using the same drawings. The outer insulation unit of the inspection hatch installed above the ceiling panel and the outer insulation unit of the inspection hatch installed below the floor panel will be described using the same drawings. The shapes of each component of the inspection hatch will be described based on the state when each surface is projected using third angle projection.

[0023] [Embodiment 1] A first embodiment of the present invention will be described with reference to Figs. 1 to 6. Fig. 1 is a schematic plan view or bottom view of a large inspection hatch according to the first embodiment. Fig. 2 is a schematic bottom view or bottom view of a large external insulation unit according to the first embodiment. Fig. 3 is a schematic plan view or bottom view of a small inspection hatch according to the first embodiment. Fig. 4 is a schematic bottom view or bottom view of a small external insulation unit according to the first embodiment. Fig. 5 is a schematic bottom view or bottom view of a large external insulation unit according to the first embodiment. Fig. 6 is a schematic bottom view or bottom view of a small external insulation unit according to the first embodiment.

[0024] (Overview of inspection hatch 10) As shown in Figures 1 to 4, the inspection hatch 10 of embodiment 1 is a structure for inspecting the space above the ceiling boards 12 or under the floor boards 12 of a building, and the overview of the inspection hatch 10 is as follows.

[0025] A rectangular opening 14 is formed in the ceiling panel 12 or the floor panel 12, and an outer frame (not shown) that is rectangular in plan view is provided around the periphery of the opening 14. A rectangular lid 16 that opens and closes the opening 14 is provided at the opening 14 in the ceiling panel 12 or the floor panel 12. In addition, a rectangular frame-shaped outer insulation unit 18 that prevents outside air from entering the room through the opening 14 in the ceiling panel 12 or the floor panel 12 is provided above the ceiling panel 12 or below the floor panel 12. The outer insulation unit 18 is arranged along the opening 14 in the ceiling panel 12 or the floor panel 12. A detachable inner insulation unit 20 that is rectangular in plan view and prevents outside air from entering the room through the opening 14 in the ceiling panel 12 or the floor panel 12 is provided inside the outer insulation unit 18. Although not shown, the inner insulation unit 20 includes a rectangular unit base and a rectangular insulation material provided on the unit base.

[0026] With the above-described configuration, when inspecting the space above the ceiling board 12 or the space below the floor board 12, the worker opens the opening 14 in the ceiling board 12 or the floor board 12 with the lid 16. Next, the worker detaches the inner insulation unit 20 from the outer insulation unit 18 and removes it from the opening 14 in the ceiling board 12 or the floor board 12 to the indoor side. The worker then enters the space above the ceiling board 12 or the space below the floor board 12 through the opening 14 in the ceiling board 12 or the floor board 12 and performs the inspection work.

[0027] After completing the inspection work above the ceiling panel 12 or below the floor panel 12, the worker sends the inner insulation unit 20 through the opening 14 in the ceiling panel 12 or floor panel 12 into the ceiling panel or below the floor and attaches it to the inside of the outer insulation unit 18. Finally, the worker closes the opening 14 in the ceiling panel 12 or floor panel 12 with the lid 16.

[0028] Next, a specific configuration of the outer insulation unit 18 according to the first embodiment will be described.

[0029] (Fixed frame 22) As shown in Figures 1 to 4, the outer insulation unit 18 includes a rectangular fixing frame 22 provided above the ceiling panel 12 or below the floor panel of the floor 12. The fixing frame 22 is arranged along the opening 14 in the ceiling panel 12 or floor panel 12. The fixing frame 22 is made of a metal such as aluminum, stainless steel, or copper alloy. Considering the light weight and ease of handling of the fixing frame 22, it is preferable that the fixing frame 22 be made of aluminum. When the fixing frame 22 is made of a metal such as aluminum, the ends of four metal members are connected by welding, for example. Note that the fixing frame 22 may be made of wood instead of a metal such as aluminum. A portion of the fixing frame 22 may be made of a metal such as aluminum, and the remaining portion of the fixing frame 22 may be made of wood.

[0030] The fixed frame 22 has four sides 22m and four corners 22c. The four sides 22m consist of a first side 22ma, a second side 22mb adjacent to the first side 22ma at a right angle, a third side 22mc adjacent to the second side 22mb at a right angle, and a fourth side 22md adjacent to the third side 22mc and the first side 22ma at a right angle. The fixed frame 22 also has a rectangular frame-shaped recess 24. The recess 24 of the fixed frame 22 includes a rectangular frame-shaped groove portion and a rectangular frame-shaped step portion.

[0031] As shown in Figures 1 and 3, the recess 24 of the fixed frame 22 opens toward the ceiling board 12 side or the floor board 12 side, but it may also open toward the opposite side of the ceiling board 12 side or the opposite side of the floor board 12 side.

[0032] (Insulation 26) As shown in FIGS. 1 to 4 , the insulating material 26 is disposed in the recess 24 of the fixed frame 22 in a rectangular frame shape. For example, the insulating material 26 is attached by being fitted into the recess 24 of the fixed frame 22. The insulating material 26 has flexibility that allows for moderate deformation, water resistance, and heat resistance. The insulating material 26 has flexibility that allows for moderate deformation, allowing it to be attached to the recess 24 of the fixed frame 22 in a tight, tight fit state without any gaps. The attachment method is not limited to fitting, and a method in which an adhesive or the like is placed between the fixed frame 22 and the insulating material 26 and bonded thereto can be used to firmly position the insulating material 26. The insulating material 26's water resistance prevents moisture, such as condensation water, that has penetrated the fixed frame 22 from passing over the insulating material 26 and adhering to the ceiling panel 12 or floor panel 12. The insulating material 26's insulating properties improve the insulation properties of the area where the insulating material 26 is installed and prevent condensation from occurring on the surface of the fixed frame 22.

[0033] The thermal insulation material 26 is made of a resin foam. The base resin of the resin foam that makes up the thermal insulation material 26 is not particularly limited, but is preferably a foamable thermoplastic resin. The thermoplastic resin is preferably at least one resin selected from the group consisting of polystyrene-based resins, polyolefin-based resins, polyester-based resins, and polycarbonate-based resins. Examples of base resins for the resin foam that makes up the thermal insulation material 26 include those described in International Publication No. 2020 / 170694, International Publication No. 2009 / 75208, and Japanese Patent No. 6612764.

[0034] The resin foam constituting the thermal insulation material 26 may be either a bead molded body or an extrusion molded body, and has a closed-cell structure with excellent water-blocking properties. The cell expansion ratio of the resin foam constituting the thermal insulation material 26 is set to 80% or more, preferably 85% or more, and more preferably 90% or more.

[0035] The expansion ratio of the resin foam constituting the thermal insulation material 26 is not particularly limited, but is set to be 10 times or more and 100 times or less, preferably 25 times or more and 75 times or less, and more preferably 30 times or more and 50 times or less. If the expansion ratio of the resin foam is less than 10 times, the weight of the thermal insulation material 26 tends to increase and the deformability of the thermal insulation material 26 tends to decrease. If the expansion ratio of the resin foam exceeds 100 times, the shape retention of the thermal insulation material 26 tends to decrease.

[0036] The resin foam separated from the recess 24 of the fixing frame 22 can be reused.

[0037] As shown in Figures 2 and 4 to 6, the heat insulating material 26 is composed of a plurality of segments S. The plurality of segments S constituting the heat insulating material 26 are classified into trapezoidal first terminal segments 28 located on one end side of each side 22m of the fixed frame 22, trapezoidal second terminal segments 30 located on the other end side of each side 22m of the fixed frame 22, and rectangular intermediate segments 32. The intermediate segments 32 are disposed between the first terminal segments 28 and the second terminal segments 30 on each side 22m of the fixed frame 22. Each of the first terminal segments 28, second terminal segments 30, and intermediate segments 32 is fitted into or engaged with a recess 24 of the fixed frame 22, thereby preventing the first terminal segments 28, second terminal segments 30, and intermediate segments 32 from falling off from the fixed frame 22. The fitting or engaging portions of the recesses 24 into which the segments S fit or engage are not particularly limited as long as they have a structure that prevents the segments S from falling off from the fixed frame 22, and any conventionally known structure can be employed.

[0038] The length dimension of each first terminal segment 28 (the length dimension along each side 22m of the fixed frame 22) and the length dimension of each second terminal segment 30 may be different (see Figures 2 and 4), or the length of each first terminal segment 28 and the length dimension of each second terminal segment 30 may be the same (see Figures 5 and 6). If the length dimension of each first terminal segment 28 and the length dimension of each second terminal segment 30 are different, it is possible to prevent the first terminal segment 28 and the second terminal segment 30 from being attached to each side 22m of the fixed frame 22 in reverse.

[0039] The abutting surfaces 28f of the first terminal segment 28 and the abutting surfaces 30f of the second terminal segment 30 that are adjacent at right angles at each corner 22c of the fixed frame 22 are each inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. The abutting surfaces 28v of the adjacent first terminal segment 28 and the abutting surfaces 32f of the intermediate segment 32 are each perpendicular to the longitudinal direction of each side 22m of the fixed frame 22. The abutting surfaces 30v of the adjacent second terminal segment 30 and the abutting surfaces 32v of the intermediate segment 32 are each perpendicular to the longitudinal direction of each side 22m of the fixed frame 22.

[0040] The first terminal segment 28, the second terminal segment 30, and one or more intermediate segments 32 are arranged point-symmetrically with respect to the center of gravity 22b of the fixed frame 22. With this configuration, the positions of the first terminal segment 28, the second terminal segment 30, and the intermediate segment 32 are made clear, and it is possible to prevent the segments S from being attached to each side 22m of the fixed frame 22 in an incorrect position.

[0041] At least three or more segments S are arranged in the recesses 24 of each side 22m of the fixed frame 22. Here, "arranging the segments S in the recesses 24 of each side 22m of the fixed frame 22" means that not only the entire segments S are arranged in the recesses 24 of each side 22m of the fixed frame 22, but also that a part of the segments S is arranged in the recesses 24 of each side 22m of the fixed frame 22.

[0042] 2 and 5, in the recess 24 of each side 22m of the fixed frame 22, a part of the second terminal segment 30, the first terminal segment 28, three intermediate segments 32, the second terminal segment 30, and a part of the first terminal segment 28 are arranged from one end to the other end (see the area surrounded by the dashed line in FIG. 2). In other words, in the large outer insulation unit 18 shown in FIG. 2 and 5, for example, seven segments S are arranged in the recess 24 of each side 22m of the fixed frame 22.

[0043] In the small-sized outer insulation unit 18 shown in Figures 4 and 6, a part of the second terminal segment 30, the first terminal segment 28, one intermediate segment 32, the second terminal segment 30, and a part of the first terminal segment 28 are arranged in the recess 24 of each side 22m of the fixed frame 22 from one end side to the other end side (see the area surrounded by the dashed line in Figure 4). In other words, in the small-sized outer insulation unit 18 shown in Figures 4 and 6, for example, five segments S are arranged in the recess 24 of each side 22m of the fixed frame 22.

[0044] Furthermore, as long as at least three or more segments S are arranged in the recesses 24 of each side 22m of the fixed frame 22, the number of segments S arranged in each of the recesses 24 of two adjacent side portions 22m of the fixed frame 22 at right angles does not have to be the same.

[0045] (Effects of the first embodiment) Next, the effects of the first embodiment will be described.

[0046] As described above, the multiple segments S constituting the thermal insulation material 26 are classified into first terminal segments 28, second terminal segments 30, and intermediate segments 32. Furthermore, at least three or more segments S are arranged in the recessed portion 24 of each side portion 22m of the fixed frame 22. Therefore, even if the sizes (length dimensions) of the first terminal segments 28 and the second terminal segments 30 are fixed, for example, by adjusting the number or size of the intermediate segments 32, a worker can easily arrange (install) the thermal insulation material 26 in a rectangular frame shape in the recessed portion 24 of a fixed frame 22 of any size. In other words, according to the first embodiment, the thermal insulation material 26 can be installed regardless of the size of the fixed frame 22, thereby improving the installability of the thermal insulation material 26, in other words, the installability of the inspection hatch 10.

[0047] As described above, the abutting surfaces 28f of the first terminal segment 28 and the abutting surfaces 30f of the second terminal segment 30 that are adjacent at right angles at each corner 22c of the fixed frame 22 are each inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. Therefore, according to the first embodiment, the adhesion between the abutting surfaces 28f of the first terminal segment 28 and the abutting surfaces 30f of the second terminal segment 30 can be increased, thereby improving the thermal insulation properties of the thermal insulator 26.

[0048] As described above, according to one embodiment of the present invention, it is possible to provide houses and the like with improved thermal insulation performance safely and inexpensively, which can contribute to the creation of livable towns and cities, for example, to the achievement of Goal 11 of the Sustainable Development Goals (SDGs), such as the creation of sustainable cities.

[0049] [Modification 1 of Embodiment 1] A first modification of the first embodiment of the present invention will be described with reference to Fig. 7. Fig. 7 is a schematic bottom view or plan view of a small-sized outer insulation unit according to the first modification of the first embodiment.

[0050] As shown in Fig. 7, the small-sized outer insulation unit 18A according to the first modification of the first embodiment has the same configuration as the small-sized outer insulation unit 18 according to the first embodiment (see Fig. 6), except for the following points: For ease of explanation, the same reference numerals are used for members having the same functions as those described in the first embodiment, and the explanation thereof will not be repeated.

[0051] (specific configuration) That is, each intermediate segment 32 is formed in a trapezoidal shape. The abutting surfaces 28v, 32f of each adjacent first terminal segment 28 and intermediate segment 32 are inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. The abutting surfaces 30v, 32v of each adjacent second terminal segment 30 and intermediate segment 32 are inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22.

[0052] In the small outer insulation unit 18A, a part of the second terminal segment 30, the first terminal segment 28, one intermediate segment 32, the second terminal segment 30, and a part of the first terminal segment 28 are arranged in the recess 24 of each side 22m of the fixed frame 22 from one end to the other end (see the area surrounded by the dashed line in Figure 7). In other words, in the small outer insulation unit 18A, for example, five segments S are arranged in the recess 24 of each side 22m of the fixed frame 22.

[0053] (Operation and effect of Modification 1 of Embodiment 1) According to the first modification of the first embodiment, in addition to the same effects as those of the first embodiment described above, the following effects are also achieved.

[0054] As described above, the abutting surfaces 28v, 32f of adjacent first terminal segments 28 and intermediate segments 32 are each inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. The abutting surfaces 30v, 32v of adjacent second terminal segments 30 and intermediate segments 32 are each inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. Therefore, according to the first modification of the first embodiment, the adhesion between the abutting surface 28v of the first terminal segment 28 and the abutting surface 32f of the intermediate segment 32, and the adhesion between the abutting surface 30v of the second terminal segment 30 and the abutting surface 32v of the intermediate segment 32 are improved, thereby further improving the thermal insulation of the insulating material 26 at each corner 22c of the fixed frame 22.

[0055] [Modification 2 of Embodiment 1] A second modification of the first embodiment of the present invention will be described with reference to Fig. 8. Fig. 8 is a schematic bottom view or plan view of a large outer insulation unit according to the second modification of the first embodiment.

[0056] As shown in Figure 8, the large outer insulation unit 18B according to the second modification of the first embodiment has the same configuration as the large outer insulation unit 18 according to the first embodiment (see Figure 5), except for the following points: For ease of explanation, the same reference numerals are used for members having the same functions as those described in the first embodiment, and their explanation will not be repeated.

[0057] (specific configuration) That is, of the abutment surfaces 28f and 30f of the first and second terminal segments 28 and 30, which are adjacent at right angles at each corner 22c of the fixed frame 22, an engagement protrusion 34 is formed on the abutment surface 28f or 30f of one of the terminal segments 28 or 30. An engagement hole 36 for engaging the engagement protrusion 34 of the one of the terminal segments 28 or 30 is formed on the abutment surface 30f or 28f of the other terminal segment 30 or 28.

[0058] The numbers of segments S arranged in the recesses 24 of the two sides 22m of the fixed frame 22 adjacent to each other at right angles are not the same.

[0059] Specifically, in the recess 24 of one of the two side portions 22m adjacent to each other at right angles on the fixed frame 22, a part of the second terminal segment 30, the first terminal segment 28, two intermediate segments 32, the second terminal segment 30, and a part of the first terminal segment 28 are arranged from one end side to the other end side (see the area surrounded by the dashed line in Figure 8). In the recess 24 of the other of the two side portions 22m adjacent to each other at right angles on the fixed frame 22, a part of the second terminal segment 30, the first terminal segment 28, one intermediate segment 32, the second terminal segment 30, and a part of the first terminal segment 28 are arranged from one end side to the other end side (see the area surrounded by the dashed line in Figure 8). In other words, in a large external insulation unit 18A, for example, six segments S are arranged in the recess 24 of one of the two side portions 22m adjacent to each other at right angles on the fixed frame 22, and for example, five segments S are arranged in the recess 24 of the other side portion 22m.

[0060] (Operation and effect of Modification 2 of Embodiment 1) According to the second modification of the first embodiment, in addition to the same effects as those of the first embodiment described above, the following effects are also achieved.

[0061] As described above, by engaging the engaging protrusion 34 of one terminal segment 28 or 30 with the engaging hole 36 of the other terminal segment 30 or 28 at each corner 22c of the fixed frame 22, the abutting surface 28f of the first terminal segment 28 and the abutting surface 30f of the second terminal segment 30 are connected. Therefore, according to the second modification of the first embodiment, the first terminal segment 28 and the second terminal segment 30 can be easily disposed (installed) in the recess 24 of the fixed frame 22, which further improves the installability of the heat insulating material 26, in other words, the installability of the inspection hatch 10. In addition, the state of close contact between the abutting surface 28f of the first terminal segment 28 and the abutting surface 30f of the second terminal segment 30 can be stabilized, thereby further improving the thermal insulation of the heat insulating material 26.

[0062] [Embodiment 2] A second embodiment of the present invention will be described with reference to Fig. 9. Fig. 9 is a schematic bottom or plan view of a small-sized outer insulation unit according to the second embodiment.

[0063] As shown in Figure 9, the small-sized outer insulation unit 38 according to the second embodiment has the same configuration as the small-sized outer insulation unit 18 according to the first embodiment (see Figure 4), except for the following points: For ease of explanation, the same reference numerals are used for components having the same functions as those described in the first embodiment, and the description thereof will not be repeated.

[0064] (specific configuration) That is, the heat insulating material 26 is composed of a plurality of segments S, and each segment S is a trapezoidal long segment 40 with both ends located at the corners 22c of the fixed frame 22. The butt faces 40f of two long segments 40 adjacent at right angles at each corner 22c of the fixed frame 22 are inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. Each long segment 40 fits into or engages with a recess 24 of the fixed frame 22, preventing the long segment 40 from falling off the fixed frame 22.

[0065] In the small outer insulation unit 38, the recesses 24 on each side 22m of the fixed frame 22 are From one end side, a part of the long segment 40, the long segment 40, and the long segment 40 are arranged (see the area surrounded by the dashed line in Figure 9). In other words, in the small outer insulation unit 18, three segments S are arranged in the recess 24 of each side 22m of the fixed frame 22.

[0066] (Effects of the second embodiment) Next, the effects of the second embodiment will be described.

[0067] As described above, three long segments 40, which are three segments S, are arranged in the recesses 24 of each side 22m of the fixed frame 22. The butt surfaces 40f of two long segments 40 adjacent to each other at right angles at each corner 22c of the fixed frame 22 are inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. Therefore, according to the second embodiment, the adhesion between the butt surfaces 40f of the two long segments 40 adjacent to each other at right angles at each corner 22c of the fixed frame 22 can be improved, thereby improving the thermal insulation properties of the thermal insulator 26.

[0068] Furthermore, by slightly displacing each long segment 40 in the longitudinal direction while the butt faces 40f of two long segments 40 adjacent at right angles at each corner 22c of the fixed frame 22 are in close contact, the worker can arrange (apply) the insulating material 26 in a rectangular frame shape in the recesses 24 of different sized fixed frames 22. In other words, according to the second embodiment, the insulating material 26 can be installed without depending as much as possible on the size of the fixed frame 22, thereby improving the installability of the insulating material 26, in other words, the installability of the inspection hatch 10.

[0069] [Modification 1 of Embodiment 2] A first modification of the second embodiment of the present invention will be described with reference to Fig. 10. Fig. 10 is a schematic bottom view or plan view of the small-sized outer insulation unit according to the second embodiment.

[0070] As shown in Figure 10, the small-sized outer insulation unit 38A according to the first modification of the second embodiment has the same configuration as the small-sized outer insulation unit 38 according to the second embodiment (see Figure 9), except for the following points: For ease of explanation, the same reference numerals are used for members having the same functions as those described in the first embodiment, and the explanation thereof will not be repeated.

[0071] (specific configuration) That is, of the abutting surfaces 40f of two long segments 40 adjacent at right angles at each corner 22c of the fixed frame 22, an engaging protrusion 42 is formed on the abutting surface 40f of one of the long segments 40. An engaging hole 44 for engaging the engaging protrusion 42 of one long segment 40 is formed on the abutting surface 40f of the other long segment 40.

[0072] In the small-sized outer insulation unit 38A, similar to the small-sized outer insulation unit 38, three long segments 40 are arranged in the recesses 24 of each side 22m of the fixed frame 22 (see the area surrounded by the dashed line in FIG. 10). In other words, in the small-sized outer insulation unit 38A, three segments S are arranged.

[0073] (Operation and effect of Modification 1 of Embodiment 2) According to the first modification of the second embodiment, in addition to the same effects as those of the second embodiment described above, the following effects are also achieved.

[0074] As described above, the butt surfaces 40f of the two long segments 40 are connected by engaging the engagement protrusions 42 of one long segment 40 with the engagement holes 44 of the other long segment 40 at each corner 22c of the fixed frame 22. Therefore, according to the first modification of the second embodiment, the worker can easily arrange (install) the long segment 40 in the recess 24 of the fixed frame 22, further improving the installability of the heat insulating material 26, in other words, the installability of the inspection hatch 10. Furthermore, the tight contact between the butt surfaces 40f of the two long segments 40 can be stabilized at each corner 22c of the fixed frame 22, further improving the thermal insulation of the heat insulating material 26.

[0075] [Embodiment 3] A third embodiment of the present invention will be described with reference to Fig. 11. Fig. 11 is a schematic bottom or plan view of a small-sized outer insulation unit according to the third embodiment.

[0076] As shown in Figure 11, the small-sized outer insulation unit 46 according to the third embodiment has the same configuration as the small-sized outer insulation unit 18 according to the first embodiment (see Figure 4), except for the following points: For ease of explanation, the same reference numerals are used for components having the same functions as those described in the first embodiment, and the description thereof will not be repeated.

[0077] (specific configuration) The heat insulating material 26 is composed of a plurality of segments S. The plurality of segments S constituting the heat insulating material 26 are classified into L-shaped segments 48 that are arranged at each corner 22c of the fixed frame 22, and rectangular intermediate segments 50 that are arranged between two L-shaped segments 48 on each side 22m of the fixed frame 22. Each L-shaped segment 48 and each intermediate segment 50 fits into or engages with a recess 24 of the fixed frame 22, preventing each L-shaped segment 48 and each intermediate segment 50 from falling off from the fixed frame 22. Note that a plurality of intermediate segments 50 may be arranged on each side 22m of the fixed frame 22.

[0078] The abutting surfaces 48f of adjacent L-shaped segments 48 and the abutting surfaces 50f of adjacent intermediate segments 50 are perpendicular to the longitudinal direction of each side 22m of the fixed frame 22. The L-shaped segments 48 and the intermediate segments 50 are arranged symmetrically with respect to the center of gravity 22b of the fixed frame 22.

[0079] In the small-sized outer insulation unit 46, a part of an L-shaped segment 48, an intermediate segment 50, and a part of an L-shaped segment 48 are arranged from one end to the other end of the recess 24 of each side 22m of the fixed frame 22 (see the area surrounded by the dashed line in FIG. 11). In other words, in the small-sized outer insulation unit 46, for example, three segments S are arranged in the recess 24 of each side 22m of the fixed frame 22.

[0080] (Effects of the Third Embodiment) Next, according to the third embodiment, the following effects are achieved.

[0081] As described above, the multiple segments S that make up the thermal insulation material 26 are classified into L-shaped segments 48 and intermediate segments 50. Three or more segments S are arranged on each side 22m of the fixed frame 22. Therefore, by adjusting the number or size of the intermediate segments 50, workers can easily arrange (install) the thermal insulation material 26 in a rectangular frame shape in the recess 24 of a fixed frame 22 of any size. In other words, according to the third embodiment, the thermal insulation material 26 can be installed regardless of the size of the fixed frame 22, thereby improving the installability of the thermal insulation material 26, in other words, the installability of the inspection hatch 10.

[0082] [Modification 1 of Embodiment 3] A first modification of the third embodiment of the present invention will be described with reference to Fig. 12. Fig. 12 is a schematic bottom view or plan view of a small-sized outer insulation unit according to the first modification of the third embodiment.

[0083] (specific configuration) As shown in Figure 12, the small-sized outer insulation unit 46A according to the first modification of the third embodiment has the same configuration as the small-sized outer insulation unit 46 according to the third embodiment (see Figure 11), except for the following points: For ease of explanation, the same reference numerals are used for components having the same functions as those described in the first embodiment, and the description thereof will not be repeated.

[0084] (specific configuration) Each intermediate segment 50 is formed in a trapezoidal shape. The abutting surfaces 48f of adjacent L-shaped segments 48 and the abutting surfaces 50f of adjacent intermediate segments 50 are inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22.

[0085] In the small-sized outer insulation unit 46A, similarly to the small-sized outer insulation unit 46, a part of an L-shaped segment 48, an intermediate segment 50, and a part of an L-shaped segment 48 are arranged from one end to the other end of the recess 24 of each side 22m of the fixed frame 22 (see the area surrounded by the dashed line in FIG. 12). In other words, in the small-sized outer insulation unit 46A, for example, three segments S are arranged in the recess 24 of each side 22m of the fixed frame 22.

[0086] (Operation and effect of Modification 1 of Embodiment 3) According to the first modification of the third embodiment, in addition to the same effects as those of the third embodiment described above, the following effects are also achieved.

[0087] As described above, the abutting surfaces 48f of adjacent L-shaped segments 48 and the abutting surfaces 50f of adjacent intermediate segments 50 are inclined at 45 degrees with respect to the longitudinal direction of each side 22m of the fixed frame 22. Therefore, according to the first modification of the third embodiment, the adhesion between the abutting surfaces 48f of the L-shaped segments 48 and the abutting surfaces 50f of the intermediate segments 50 can be improved, thereby improving the thermal insulation of the thermal insulators 26 at each corner 22c of the fixed frame 22.

[0088] [Embodiment 4] A fourth embodiment of the present invention will be described with reference to Figures 13 to 16. Figures 13 to 16 are schematic diagrams illustrating a method for applying a heat insulating material according to the fourth embodiment.

[0089] As shown in Figures 13 to 16, the method for installing a heat insulating material according to embodiment 4 is a method for arranging heat insulating material 26 in a rectangular frame shape in rectangular fixed frame 22 used in inspection hatch 10 (see Figures 1 and 2) according to embodiment 1. The specific configuration of the method for installing a heat insulating material according to embodiment 4 is as follows.

[0090] (specific configuration) As shown in Fig. 13, the first terminal segment 28, the multiple intermediate segments 32, and the second terminal segment 30 are sequentially fitted into the recess 24 of the first side 22ma of the fixed frame 22 from one end to the other. Next, as shown in Fig. 14, the first terminal segment 28, the multiple intermediate segments 32, and the second terminal segment 30 are sequentially fitted into the recess 24 of the second side 22mb of the fixed frame 22 from one end to the other. Furthermore, as shown in Fig. 15, the first terminal segment 28, the multiple intermediate segments 32, and the second terminal segment 30 are sequentially fitted into the recess 24 of the third side 22mc of the fixed frame 22 from one end to the other.

[0091] 16, the first terminal segment 28 is attached to one end of the recess 24 of the fourth side 22md of the fixed frame 22 by fitting, and the second terminal segment 30 is attached to the other end of the recess 24 of the fourth side 22md of the fixed frame 22 by fitting. Then, two intermediate segments 32 other than the predetermined intermediate segment 32 are attached by fitting between the first terminal segment 28 and the second terminal segment 30 in the recess 24 of the fourth side 22md of the fixed frame 22. Finally, the predetermined intermediate segment 32 is attached by pushing it between the two intermediate segments 32 (between the first terminal segment 28 and the second terminal segment 30) in the recess 24 of the fourth side 22md of the fixed frame 22. Note that it is desirable to adjust the length of the predetermined intermediate segment 32 before pushing it in.

[0092] Next, the effects of the fourth embodiment will be described.

[0093] A first terminal segment 28, a plurality of intermediate segments 32, and a second terminal segment 30 are attached to the recesses 24 from the first side portion 22ma to the second side portion 22mb of the fixed frame 22. Therefore, even if the sizes (length dimensions) of the first terminal segment 28 and the second terminal segment 30 are fixed, for example, a worker can easily arrange (apply) the insulating material 26 in a rectangular frame shape in the recesses 24 of the fixed frame 22 of any size by adjusting the number or size of the intermediate segments 32. In other words, according to the fourth embodiment, the insulating material 26 can be installed without depending on the size of the fixed frame 22, thereby improving the installability of the insulating material 26, in other words, the installability of the inspection hatch 10.

[0094] As described above, a predetermined intermediate segment 32 is attached by being pushed between the first terminal segment 28 and the second terminal segment 30 in the recess 24 of the fourth side 22md of the fixed frame 22. Therefore, according to the fourth embodiment, the adhesion between adjacent segments S can be increased, thereby improving the thermal insulation properties of the insulating material 26. [Example]

[0095] An embodiment of the present invention will be described with reference to the drawings.

[0096] Example 1 As shown in Figures 2 and 13 to 16, the worker prepared one first terminal segment 28, one second terminal segment 30, and three intermediate segments 32 as multiple segments S to be arranged on each side 22m of the rectangular fixed frame 22. The long side dimension of the first terminal segment 28 was 403.0 mm, the short side dimension of the first terminal segment 28 was 296.5 mm, and the width dimension of the first terminal segment 28 was 122.0 mm. The long side dimension of the second terminal segment 30 was 253.0 mm, the short side dimension of the second terminal segment 30 was 146.5 mm, and the width dimension of the second terminal segment 30 was 122.0 mm. The length dimension of the intermediate segment 32 was 150.0 mm, and the width dimension of the intermediate segment 32 was 122.0 mm. Then, the worker arranged the insulating material 26 in a rectangular frame shape on the rectangular fixed frame 22 using the insulating material installation method of embodiment 4. The vertical dimension of the insulating material 26 was 1137.0 mm, and the horizontal dimension of the insulating material 26 was 1137.0 mm. Kanepearl VF (manufactured by Kaneka Corporation) was used as the material for the insulating material 26. The insulating material 26 placed in the fixing frame 22 was placed without any gaps in the recessed portion 24 of the fixing frame 22, the adhesion state (butting state) between the segments S was good, and no falling off of the segments S from the recessed portion 24 of the fixing frame 22 was observed.

[0097] Example 2 As shown in Figures 4 and 13 to 16, the worker prepared one first terminal segment 28, one second terminal segment 30, and one intermediate segment 32 as multiple segments S to be arranged on each side 22m of the rectangular fixed frame 22. The dimensions of the first terminal segment 28, the second terminal segment 30, and the intermediate segment 32 were the same as in Example 1. The worker then arranged the insulating material 26 in a rectangular frame shape on the rectangular fixed frame 22 using the insulating material installation method of Embodiment 4. The vertical dimension of the insulating material 26 was 837.0 mm, and the horizontal dimension of the insulating material 26 was 837.0 mm. The same material as in Example 1 was used to form the insulating material 26. The insulating material 26 arranged on the fixed frame 22 was placed in the recessed portion 24 of the fixed frame 22 with no gaps, the segments S were in good contact with each other (butted together), and no segments S were observed to fall off from the recessed portion 24 of the fixed frame 22. [Explanation of symbols]

[0098] 10 Inspection hatch 12 Ceiling or floor boards 14 Openings 16 Lid 18. Outer insulation unit 20 Inner insulation unit 22 Fixed Frame 22c Corner 22m edge 22ma First edge 22mb second side 22mc 3rd side 22md 4th side 24 recess 26 Insulation 26b Center of gravity S segment 28 First Terminal Segment 30 Second Terminal Segment 32 Middle Segment 18A External insulation unit 18B External insulation unit 34 Engagement protrusion 36 Engagement hole 38 External insulation unit 38A External insulation unit 40 long segments 42 Engagement protrusion 44 Engagement hole 46 External insulation unit 46A External insulation unit 48 L-shaped segments 50 middle segments

Claims

1. a rectangular fixing frame provided under the ceiling board or under the floor board and arranged along an opening formed in the ceiling board or the floor board; In the inspection hatch, a heat insulating material is arranged in a rectangular frame shape on the fixed frame and is composed of a plurality of segments, At least three or more of the segments are arranged on each side of the fixed frame, A rectangular frame-shaped recess is formed in the fixed frame, and each segment is fitted into or engaged with the recess of the fixed frame, The plurality of segments constituting the heat insulating material are classified into first terminal segments located on one end side of each side of the fixed frame, second terminal segments located on the other end side of each side of the fixed frame, and intermediate segments located between the first terminal segments and the second terminal segments on each side of the fixed frame, An inspection hatch in which the first terminal segment, the second terminal segment, and the intermediate segment are arranged point-symmetrically with respect to the center of gravity of the fixed frame.

2. 2. The inspection hatch according to claim 1, wherein the abutting surfaces of two adjacent segments at right angles at each corner of the fixed frame are inclined at 45 degrees with respect to the longitudinal direction of each side of the fixed frame.

3. a rectangular fixing frame provided under the ceiling board or under the floor board and arranged along an opening formed in the ceiling board or the floor board; In the inspection hatch, a heat insulating material is arranged in a rectangular frame shape on the fixed frame and is composed of a plurality of segments, At least three or more of the segments are arranged on each side of the fixed frame, The plurality of segments constituting the heat insulating material are classified into first terminal segments located on one end side of each side of the fixed frame, second terminal segments located on the other end side of each side of the fixed frame, and intermediate segments located between the first terminal segments and the second terminal segments on each side of the fixed frame, An inspection hatch in which the abutting surfaces of each adjacent first terminal segment and intermediate segment are each inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame, and the abutting surfaces of each adjacent second terminal segment and intermediate segment are each inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

4. a rectangular fixing frame provided under the ceiling board or under the floor board and arranged along an opening formed in the ceiling board or the floor board; In the inspection hatch, a heat insulating material is arranged in a rectangular frame shape on the fixed frame and is composed of a plurality of segments, At least three or more of the segments are arranged on each side of the fixed frame, The plurality of segments constituting the heat insulating material are classified into first terminal segments located on one end side of each side of the fixed frame, second terminal segments located on the other end side of each side of the fixed frame, and intermediate segments located between the first terminal segments and the second terminal segments on each side of the fixed frame, An inspection hatch in which the first terminal segment, the second terminal segment, and the intermediate segment are arranged point-symmetrically with respect to the center of gravity of the fixed frame.

5. An inspection hatch as described in claim 1 or 4, wherein the abutting surfaces of each adjacent first terminal segment and intermediate segment are each inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame, and the abutting surfaces of each adjacent second terminal segment and intermediate segment are each inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

6. The inspection hatch according to claim 2 , wherein each segment is an elongated segment whose both ends are located at the corners of the fixed frame.

7. An inspection hatch as described in any one of claims 2 to 6, wherein an engagement protrusion is formed on the abutment surface of one of the two segments adjacent at right angles at each corner of the fixed frame, and an engagement hole for engaging the engagement protrusion of one of the segments is formed on the abutment surface of the other segment.

8. a rectangular fixing frame provided under the ceiling board or under the floor board and arranged along an opening formed in the ceiling board or the floor board; In the inspection hatch, a heat insulating material is arranged in a rectangular frame shape on the fixed frame and is composed of a plurality of segments, At least three or more of the segments are arranged on each side of the fixed frame, abutting surfaces of two adjacent segments at right angles at each corner of the fixed frame are inclined at 45 degrees with respect to the longitudinal direction of each side of the fixed frame, An inspection hatch in which an engagement protrusion is formed on the abutment surface of one of the two segments that are adjacent at right angles at each corner of the fixed frame, and an engagement hole is formed on the abutment surface of the other segment for engaging the engagement protrusion of one of the segments.

9. The inspection hatch described in claim 1, wherein the multiple segments that make up the insulation material are classified into L-shaped segments that are arranged at each corner of the fixed frame and are L-shaped, and intermediate segments that are arranged between two of the L-shaped segments on each side of the fixed frame.

10. 10. The inspection hatch according to claim 9, wherein the abutting surfaces of each adjacent L-shaped segment and each intermediate segment are inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

11. a rectangular fixing frame provided under the ceiling board or under the floor board and arranged along an opening formed in the ceiling board or the floor board; In the inspection hatch, a heat insulating material is arranged in a rectangular frame shape on the fixed frame and is composed of a plurality of segments, At least three or more of the segments are arranged on each side of the fixed frame, The plurality of segments constituting the thermal insulation material are classified into L-shaped segments arranged at each corner of the fixed frame and L-shaped, and intermediate segments arranged between two of the L-shaped segments at each side of the fixed frame, An inspection hatch in which the abutting surfaces of each adjacent L-shaped segment and intermediate segment are inclined at 45 degrees relative to the longitudinal direction of each side of the fixed frame.

12. 12. An inspection hatch according to claim 3, 8 or 11, characterized in that a rectangular frame-shaped recess is formed in the fixed frame, and each segment is fitted into or engaged with the recess of the fixed frame.

13. An inspection hatch as described in any one of claims 1 to 12, characterized in that the insulation material is composed of a polystyrene-based resin foam or a polyolefin-based resin foam having an expansion ratio of 10 times or more and less than 100 times.

14. 2. A method for installing a heat insulating material in a rectangular frame shape in a rectangular fixed frame used for an inspection hatch according to claim 1, a first terminal segment, an intermediate segment, and a second terminal segment are sequentially attached to a first side of the fixed frame; Next, the first terminal segment, the intermediate segment, and the second terminal segment are sequentially attached to a second side portion adjacent to the first side portion of the fixing frame at a right angle; Furthermore, the first terminal segment, the intermediate segment, and the second terminal segment are sequentially attached to a third side portion adjacent to the second side portion of the fixing frame at a right angle; Then, the first terminal segment is attached to one end side of a fourth side portion adjacent to the third side portion and the first side portion of the fixed frame at right angles, and the second terminal segment is attached to the other end side of the fourth side portion of the fixed frame, and the intermediate segment is pushed and attached between the first terminal segment and the second terminal segment at the fourth side portion of the fixed frame.

15. a rectangular fixing frame provided under the ceiling board or under the floor board and arranged along an opening formed in the ceiling board or the floor board; In the inspection hatch, a heat insulating material is arranged in a rectangular frame shape on the fixed frame and is composed of a plurality of segments, At least three or more of the segments are arranged on each side of the fixed frame, In a method for installing insulation material for arranging insulation material in a rectangular frame shape in a rectangular fixed frame used for an inspection hatch, the plurality of segments constituting the insulation material are classified into first terminal segments located on one end side of each side of the fixed frame, second terminal segments located on the other end side of each side of the fixed frame, and intermediate segments located between the first terminal segment and the second terminal segment on each side of the fixed frame, a first terminal segment, an intermediate segment, and a second terminal segment are sequentially attached to a first side of the fixed frame; Next, the first terminal segment, the intermediate segment, and the second terminal segment are sequentially attached to a second side portion adjacent to the first side portion of the fixing frame at a right angle; Furthermore, the first terminal segment, the intermediate segment, and the second terminal segment are sequentially attached to a third side portion adjacent to the second side portion of the fixing frame at a right angle; Then, the first terminal segment is attached to one end side of a fourth side portion adjacent to the third side portion and the first side portion of the fixed frame at right angles, and the second terminal segment is attached to the other end side of the fourth side portion of the fixed frame, and the intermediate segment is pushed and attached between the first terminal segment and the second terminal segment at the fourth side portion of the fixed frame.

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