Edge joist support, and double floor structure

Abstract

To provide an edge joist support 10 capable of dispersing a load from an upper floor material 40 without requiring special processing of a joist material 30.SOLUTION: An edge joist support 10 has a joist support plate 14 having a female screw hole 15a penetrating in a vertical direction and a support bolt 22 screwed into the female screw hole 15a. The joist support plate 14 has a joist support surface 14a, a first rising portion 11, a second rising portion 12, a third rising portion 13, and a protrusion 16. The third rising portion 13 is formed lower than the second rising portion at a second end 14c at the female screw hole 15a side of the joist support surface 14a. The second rising portion 12 is formed at a position adjacent to the female screw hole 15a. The first rising portion 11 and the third rising portion 13 face both side surfaces of a joist material 30 arranged on the joist support surface 14a, and a lower surface of the protrusion 16 faces a part of an upper surface of the joist material 30. A second upper surface 12c of the second rising portion 12 has a portion at the same height as the upper surface of the joist material 30.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a skirting board receiver and a double floor structure using the skirting board receiver.

Background Art

[0002] A double floor structure using a joist receiver constructed on a building floor such as concrete is known (for example, Patent Document 1, Patent Document 2, etc.). The double floor structure is adopted, for example, in a concrete building floor such as an apartment building. A plurality of joist receivers are installed at predetermined intervals on the building floor, and a floor material is placed thereon for construction. The joist receiver is configured to be height-adjustable, and the distance between the building floor and the floor material can be adjusted by adjusting the height of the joist receiver. The double floor structure exhibits excellent effects such as sound insulation and heat insulation depending on the material of the floor material and the configuration of the joist receiver. Among the joist materials, those installed along the wall are called skirting joists.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in order to securely hold the joist material, the conventional joist receiver requires the joist material to be processed into a special shape. Specifically, a groove extending in the longitudinal direction is provided on the side surface of the joist material, and the joist receiver is slidably attached to the joist material by inserting a ridge of the joist receiver into the groove. Therefore, labor and costs are required for processing the joist material.

[0005] In addition, when supporting a floor joist member for a conventional floor joist, the floor joist receiver is in a state where the floor joist member is a cantilever beam with respect to the support bolt, and the floor joist receiver is likely to bend due to the load from the upper floor member.

[0006] Therefore, the present invention provides a floor joist receiver that does not require special processing of the floor joist member and can disperse the load from the upper floor member, and a double floor structure using the floor joist receiver.

Means for Solving the Problems

[0007] The present invention has been made to solve at least a part of the above-described problems, and can be realized as the following aspects or application examples.

[0008] [1] One aspect of the floor joist receiver according to the present invention is a floor joist receiving plate formed with a female screw hole penetrating in the vertical direction, a support bolt screwed into the female screw hole, and has the floor joist receiving plate has a floor joist support surface formed on the upper surface of the floor joist receiving plate, a first upright portion, a second upright portion, and a third upright portion extending above the floor joist support surface, and a ridge protruding from the upper portion of the first upright portion and extending parallel to the floor joist support surface, the floor joist support surface is formed in a flat portion extending in a first direction from the female screw hole, the first upright portion is formed at one end of the floor joist support surface, the third upright portion is formed lower than the second upright portion at the other end of the floor joist support surface on the side of the female screw hole, the second upright portion is formed at a position adjacent to the female screw hole, the first upright portion and the third upright portion face both side surfaces of the floor joist member disposed on the floor joist support surface and face each other, the lower surface of the ridge faces a part of the upper surface of the floor joist member, and the upper surface of the second upright portion has a portion having the same height as the upper surface of the floor joist member.

[0009] According to one aspect of the above-mentioned joist receiver, since the protrusion is located at a position facing the upper surface of the joist member, it is not necessary to groove the side surface of the joist member. Further, since a part of the upper surface of the second upright portion is at the same height as the upper surface of the joist member, the load from the upper floor member is also received by the upper surface of the second upright portion. As a result, not only the joist support surface but also the position adjacent to the female screw hole, that is, near the support bolt, can receive the load from the upper floor member. Therefore, not only the conventional cantilever beam structure but also the load can be dispersed to the support bolt side.

[0010] [2] In one aspect of the above-mentioned joist receiver, The upper surface of the second upright portion includes, in plan view, a first portion located on the back side of the female screw hole with respect to the first upright portion, and a second portion extending in a second direction orthogonal to the first direction from the first portion, The second portion can have a portion that overlaps a part of the female screw hole in the second direction in plan view.

[0011] With such a configuration, since the load from the upper floor member can be received by the first portion and the second portion around the female screw hole, it is easy to transmit the load to the support bolt.

[0012] [3] In one aspect of the above-mentioned joist receiver, The side surface of the second upright portion can have a concave portion that curves along the female screw hole.

[0013] With such a configuration, since the second upright portion can be formed along the female screw hole, the second upright portion can receive the load from the upper floor member at a position close to the support bolt, so it is easy to transmit the load to the support bolt.

[0014] [4] One aspect of the double floor structure according to the present invention is characterized in that one aspect of the above-mentioned joist receiver is disposed on the lower floor, the joist member is held on the joist support surface, and the upper floor member is supported on the upper surface of the first upright portion and the upper surface of the second upright portion.

[0015] According to one aspect of the above double - floor structure, since it is not necessary to groove the joist material, it is possible to reduce the material cost and shorten the material processing period. In addition, since the actual joist receiver has a support structure that does not rely solely on the cantilever beam structure, the rigidity of the upper floor material at the wall edge is increased.

Advantages of the Invention

[0016] According to one aspect of the actual joist receiver according to the present invention, since it is not necessary to groove the joist material, the material cost can be reduced and the material processing period can be shortened, and the load from the upper floor material can be dispersed. According to one aspect of the double - floor structure according to the present invention, since it is not necessary to groove the joist material, the material cost can be reduced and the material processing period can be shortened, and the rigidity of the upper floor material at the wall edge can be increased.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0018] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention described in the claims. Also, not all of the configurations described below are essential constituent elements of the present invention.

[0019] 1. Double floor structure FIG. 1 is a front view of the skirting board receiver 10 according to an embodiment of the present invention. Also, FIGS. 1 and 6 show a part of the double floor structure 50 according to an embodiment of the present invention at the wall side.

[0020] As shown in FIG. 1, in the double floor structure 50, the skirting board receiver 10 is disposed on the lower floor 42, the floor joist 30 is held on the floor joist support surface 14a, and the upper floor material 40 is supported on the first upper surface 11c of the first upright portion 11 and the second upper surface 12c of the second upright portion 12. A plurality of skirting board receivers 10 are installed along the wall 44 to support the floor joist 30 extending along the wall 44. Although FIG. 1 shows only the configuration at the wall side, the double floor structure 50 includes a plurality of floor joists and skirting board receivers (not shown) between the lower floor 42 and the upper floor material 40. As skirting board receivers other than the skirting board receiver 10, known skirting board receivers may be employed. The space between the lower floor 42 and the upper floor material 40 is constructed to have a predetermined interval. With the double floor structure 50, various pipes and various wirings can be installed between the lower floor 42 and the upper floor material 40. Since the details of the skirting board receiver 10 will be described later, the description here is omitted.

[0021] For the upper floor material 40 and the lower floor 42, known materials and structures can be adopted. The lower floor 42 can be, for example, a concrete framed floor. The upper floor material 40 is configured, for example, by installing a finishing material on a base panel. The base panel can adopt plywood, particle board, etc., and the finishing material can adopt a flooring material, cork material, vinyl floor tile, sheet material, stone material, tatami, etc. Also, a heat insulating material may be sandwiched between the base panel and the finishing material.

[0022] The joist material 30 can adopt a known wooden joist material. In particular, a joist material 30 of a general size that is adopted for the edge joist can be used. In particular, a concave groove is not required on the side surface of the joist material 30 supported by the edge joist receiver 10. Therefore, since it is not necessary to perform grooving on the joist material 30, the material cost can be reduced, and moreover, the material processing period of the joist material 30 can be shortened. Where there is no edge joist receiver 10, the joist material 30 supports the floor boarding 40 on its upper surface, but there may be a slight gap between the joist material 30 and the floor boarding 40 on the edge joist receiver 10.

[0023] The edge joist receiver 10 is arranged adjacent to the wall 44 and supports the floor boarding 40 on the first upper surface 11c of the first upright upper part 11 and the second upper surface 12c of the second upright upper part 12. In the case of a conventional edge joist receiver, the floor boarding 40 was only supported on the joist material, but the edge joist receiver 10 according to the present embodiment also supports the floor boarding 40 on the second upper surface 12c of the second upright upper part 12. And since the second upright upper part 12 is located at a position adjacent to the female screw hole 15a as will be described later, the load from the floor boarding 40 can be applied vertically to the support bolt 22, rather than a cantilever beam as in the conventional case. Therefore, according to the double-floor structure 50, the rigidity of the floor boarding 40 at the wall edge is increased, and the stability of the floor surface is improved.

[0024] 2. Edge joist receiver Figs. 1 to 5 are views showing the edge joist receiver 10 according to the present embodiment. Fig. 1 is a front view of the edge joist receiver 10 according to the present embodiment, Fig. 2 is a plan view of the edge joist receiver 10 according to the present embodiment, Fig. 3 is a right side view of the edge joist receiver 10 according to the present embodiment, Fig. 4 is a sectional view taken along line A-A of Fig. 1, and Fig. 5 is a sectional view taken along line B-B of Fig. 2. In Figs. 2 to 5, the floor boarding 40 is omitted.

[0025] As shown in Fig. 1, the edge joist receiver 10 has a joist receiving plate 14 in which a female screw hole 15a penetrating in the vertical direction (the third direction Z) is formed, and a support bolt 22 screwed into the female screw hole 15a. The edge joist receiver 10 is preferably made of, for example, synthetic resin, but the support bolt 22 may be made of metal.

[0026] The joist receiving plate 14 has a joist support surface 14a formed on the upper surface of the joist receiving plate 14, a first upright portion 11, a second upright portion 12, and a third upright portion 13 extending upward from the joist support surface 14a, and a protrusion 16 protruding from the upper portion of the first upright portion 11 and extending parallel to the joist support surface 14a. The joist receiving plate 14 has a shape in which the first upright portion 11 and the second upright portion 12 rise from both ends of a flat plate extending in the first direction X to the third direction Z, and is a plate-shaped member formed in a substantially U shape when viewed from the front. And a female screw hole 15a and the third upright portion 13 are formed between the first upright portion 11 and the second upright portion 12. Here, in a state where the joist receiver 10 is installed on the lower floor 42, the first direction X is a horizontal direction and is a direction toward the wall 44, the second direction Y is a direction orthogonal to the first direction X in the horizontal plane, and the third direction Z is a vertical direction and is orthogonal to the first direction X and the second direction Y.

[0027] The joist support surface 14a is formed on a flat portion extending in the first direction X (left in FIG. 1) from the female screw hole 15a. The joist support surface 14a is a surface on which a joist member 30 extending in the second direction Y is placed. The first upright portion 11 is formed at one end (the first end portion 14b) of the joist support surface 14a. The third upright portion 13 is formed lower than the second upright portion 12 at the other end (the second end portion 14c) on the side of the female screw hole 15a of the joist support surface 14a. As shown in FIG. 2, the length of the joist support surface 14a in the first direction X is formed slightly longer than the width of the joist member 30. The length of the joist support surface 14a in the second direction Y is shorter than the length in the first direction X.

[0028] The first upright upper part 11 is arranged on the wall 44 side. The first upright upper part 11 may be in contact with the wall 44. The first upright upper part 11 is a plate-like part extending in the third direction Z from the first end part 14b. As shown in FIG. 2, the width of the first upright upper part 11 in a plan view in the second direction Y is the same as the width of the joist receiving plate 14. The first upright upper part 11 is at the position farthest from the female screw hole 15a in the first direction X. The first side surface 11a of the first upright upper part 11 faces the joist support surface 14a and is a flat surface extending in the third direction Z. The first upper surface 11c at the upper end of the first upright upper part 11 is at a position slightly higher than the upper surface of the joist 30 supported by the joist support surface 14a. Therefore, in the actual joist receiver 10, the upper floor material 40 is directly supported by the first upper surface 11c and the second upper surface 12c. The height of the first upper surface 11c (the height in the third direction Z from the joist support surface 14a) is preferably not more than, for example, 2 mm, and more preferably not more than 1 mm, higher than the upper surface of the joist 30. Since the upper floor material 40 is supported by the upper surface of the joist 30 at a place where there is no actual joist receiver 10, it is preferable that there is as little difference as possible between that part and the support height in the actual joist receiver 10. Also, the height of the first upper surface 11c is preferably not more than, for example, 2 mm, and more preferably not more than 1 mm, higher than the height of the second upper surface 12c (both are the heights in the third direction Z from the joist support surface 14a).

[0029] The protrusion 16 is a plate-like part protruding from the upper part of the first upright upper part 11, for example, the upper end, toward the second upright upper part 12 side. The protrusion 16 restricts the upward movement of the joist 30. The protrusion 16 protrudes from the position of the first upright upper part 11 which is slightly higher than the height of the joist 30. The length of the protrusion 16 in the first direction X only needs to be such that the joist 30 does not come off from the actual joist receiver 10, and when assembling the joist 30 and the actual joist receiver 10, the joist 30 can enter the first side surface 11a It is sufficient to the extent possible. As shown in FIG. 2, the width of the protrusion 16 is the same as the width of the joist support surface 14a in the second direction Y. The thickness of the protrusion 16 can be appropriately set within a range that does not affect the operation on the protrusion 16. Since it is not a part where strength is required, it may be 1 mm or less. By the protrusion 16 being at a position facing the upper surface of the joist member 30 disposed on the joist support surface 14a, the movement of the joist member 30 in the third direction Z can be restricted, and it is possible to make it difficult for the joist member 30 to come out from the joist receiver 10.

[0030] The second upright upper part 12 is formed at a position adjacent to the female screw hole 15a. The second upright upper part 12 is a plate-like part extending in the third direction Z. The width of the second upright upper part 12 in the second direction Y is, for example, the same as the width of the first upright upper part 11 and the width of the joist support surface 14a as shown in FIG. 2. The second upper surface 12c of the second upright upper part 12 has a part at the same height as the upper surface of the joist member 30. "The same height" means at least within the range of the dimensional error of the wooden joist member 30 being the same height. In this embodiment, all of the second upper surface 12c is at the same height as the upper surface of the joist member 30. The thickness of the second upright upper part 12 in the first direction X is preferably wider for supporting the floor joist 40. For example, it is preferably about the thickness of the protrusion 15, and for example, it is preferably 4 mm or more. When the floor joist 40 is supported only by the upper surface of the joist member 30, the joist receiving plate 14 is in a cantilever state and is easily deflected. However, by supporting the floor joist 40 with the second upper surface 12c of the second upright upper part 12 adjacent to the female screw hole 15a, the load can be transmitted to the support bolt 22 without significant deflection of the joist receiving plate 14. Thus, according to the joist receiver 10, the load from the floor joist 40 can be dispersed to the joist support surface 14a and the second upright upper part 12. And by disposing the joist receiver 10 along the wall, a firm rigidity can be given to the floor joist 40.

[0031] The first upright upper part 11 and the third upright upper part 13 face both side surfaces of the joist member 30 disposed on the joist support surface 14a. The lower surface of the protrusion 16 faces a part of the upper surface of the joist member 30. Therefore, the joist member 30 is held so as to be sandwiched between the first side surface 11a of the first upright upper part 11 and the third side surface 13a of the third upright upper part 13 in the front-rear direction of the first direction X, and is held so as to be sandwiched between the joist support surface 14a and the lower surface of the protrusion 16 in the up-down direction of the third direction Z. The joist member 30 does not have to be in close contact with the protrusion 16, the first side surface 11a, and the third side surface 13a, and it is sufficient that the joist member 30 can be held so that the intermediate joist receiver 10 does not come off the joist member 30 even when the joist member 30 is lifted during construction. With the joist member 30 held by the first upright upper part 11, the third upright upper part 13, and the joist support surface 14a during construction, the intermediate joist receiver 10 can be slid to an appropriate position along the joist member 30 extending in the second direction Y. Thus, according to the intermediate joist receiver 10, even if the joist member 30 has no groove, the joist member 30 can be held, so that the material cost can be reduced and the material processing period can be shortened.

[0032] The third upright upper part 13 is disposed adjacent to the female screw hole 15a. As shown in FIGS. 2 and 3, two third upright upper parts 13 may be provided with the female screw hole 15a sandwiched therebetween in the second direction Y, or may be provided as one continuous protrusion bypassing the female screw hole 15a. The third upright upper part 13 is provided at a position that does not prevent the movement of the support bolt 22 moving up and down in the female screw hole 15a. The height of the third upright upper part 13 is lower than that of the first upright upper part 11 and the second upright upper part 12. The third upright upper part 13 has a tapered surface 13b formed to incline from the upper end toward the third side surface 13a side.

[0033] As shown in Fig. 2, in plan view, the second upper surface 12c of the second upright upper part 12 includes a first part 12d located on the back side of the female screw hole 15a with respect to the first upright upper part 11, and second parts 12e, 12e extending in a second direction Y orthogonal to the first direction X from the first part 12d. The second parts 12e have portions that overlap a part of the female screw hole 15a in the second direction Y in plan view. The first part 12d and the second parts 12e are parts having the same height as the upper surface of the joist member 30. By arranging the first part 12d and the second parts 12e that receive the load from the upper floor member 40 so as to surround a part of the female screw hole 15a, it is easy to transmit the load from the upper floor member 40 to the support bolt 22. The second side surface 12a of the second upright upper part 12 has a concave surface part 12b that curves along the female screw hole 15a. The second side surface 12a is provided on the side of the female screw hole 15a of the second upright upper part 12. Due to the concave surface part 12b the second upright upper part 12 can be formed along the female screw hole 15a with the second side surface 12a without hindering the lifting and lowering of the support bolt 22. As a result, the second upper surface 12c comes close to the female screw hole 15a, and the load from the upper floor member 40 can be efficiently transmitted to the support bolt 22.

[0034] The joist receiving plate 14 has a protrusion 15 that protrudes downward from the lower surface of the joist receiving plate 14 at the position where the female screw hole 15a is formed. The protrusion 15 can be substantially cylindrical as shown in Fig. 4. The protrusion 15 has a female screw hole 15a formed therein that extends to the upper surface of the joist receiving plate 14. The female screw hole 15a has a female screw 15b formed on its inner peripheral surface. The female screw hole 15a is screwed with the male screw 22a of the support bolt 22.

[0035] The support bolt 22 has a male screw 22a formed on its outer peripheral surface and extends along the third direction Z which is the vertical direction. A groove 22b for inserting a minus driver is formed at the upper end of the support bolt 22 (Fig. 2). When the support bolt 22 is rotated with a minus driver, the joist receiving plate 14 moves up and down along the third direction Z along the support bolt 22, and the height of the upper floor member 40 with respect to the lower floor 42 can be adjusted. A base 20 made of a material that absorbs vibration such as rubber or soft plastic is fixed to the lower end of the support bolt 22.

[0036] As shown in Fig. 5, the joist member 30 is inserted obliquely from above from the side of the third upright upper portion 13 while avoiding the protrusion 16 and is placed on the joist support surface 14a. At this time, since the joist receiving plate 14 is made of synthetic resin, the joist member 30 may be pushed between the first upright upper portion 11 and the third upright upper portion 13 while slightly deforming the first upright upper portion 11. Further, since the third upright upper portion 13 is lower than the first upright upper portion 11, the joist member 30 can be moved to the joist support surface 14a, and in particular, the taper surface 13b makes it easier to move the joist member 30 toward the joist support surface 14a side.

[0037] 3. Modified Example Figs. 6 to 9 are views showing the joist receiver 100 according to a modified example of the present invention. Figs. 6 and 9 show a part of the double floor structure 50 according to the modified example of the present invention at the wall side. Fig. 6 is a front view of the joist receiver 100 according to the modified example, Fig. 7 is a plan view of the joist receiver 100 according to the modified example, Fig. 8 is a cross-sectional view taken along line C-C of Fig. 6, and Fig. 9 is a cross-sectional view taken along line D-D of Fig. 7. In Figs. 6 to 9, parts having the same functions as those in Figs. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted.

[0038] As shown in Fig. 6, in the modified example, the shape of the third upright upper portion 13 is different from that in the above-described embodiment. The third upright upper portion 13 has a substantially cylindrical shape extending upward from the joist support surface 14a. A female screw hole 15a penetrating vertically is formed inside the third upright upper portion 13. The portion of the third upright upper portion 13 closest to the first upright upper portion 11 is the third side surface 13a. As seen in plan view as shown in Fig. 7, the third side surface 13a is a curved surface, but the joist member 30 can be held between the first side surface 11a.

[0039] The joist receiver 100 does not have a protrusion 15 protruding downward from the joist receiving plate 14. Therefore, it is advantageous in that a double floor structure 52 having a narrower distance between the lower floor 42 and the upper floor member 40 than in the above-described embodiment can be obtained.

[0040] Thus, according to the soleplate receiver 100 according to the modified example, similar to the above-described embodiment, grooving of the soleplate member 30 is not required, so that material costs can be reduced and the material processing period can be shortened, and the load from the upper floor member 40 can be dispersed. Further, according to one aspect of the double floor structure 52 according to the modified example, similar to the above-described embodiment, grooving of the soleplate member 30 is not required, so that material costs can be reduced and the material processing period can be shortened, and the rigidity of the upper floor member 40 at the wall side can be increased.

[0041] The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the present invention includes a configuration that is substantially the same as the configuration described in the embodiment (for example, a configuration having the same functions, methods, and results, or a configuration having the same objectives and effects). Further, the present invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. Further, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same objective. Further, the present invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

Explanation of Reference Numerals

[0042] 10, 100... soleplate receiver, 11... first upright upper portion, 11a... first side surface, 11c... first upper surface, 12... second upright upper portion, 12a... second side surface, 12b... concave portion, 12c... second upper surface, 12d... first portion, 12e... second portion, 13... third upright upper portion, 13a... third side surface, 13b... tapered surface, 14... soleplate receiving plate, 14a... soleplate support surface, 14b... first end portion, 14c... second end portion, 15... protrusion, 15a... female screw hole, 15b... female screw, 16... rib, 20... base portion, 22... support bolt, 22a... male screw, 22b... groove, 30... soleplate member, 40... upper floor member, 42... lower floor, 44... wall, 50... double floor structure, X... first direction, Y... second direction, Z... third direction

Claims

1. A joist receiving plate having a female screw hole penetrating in the vertical direction, A support bolt screwed into the female screw hole, and having, The joist receiving plate has a joist support surface formed on the upper surface of the joist receiving plate, a first upright portion, a second upright portion, and a third upright portion extending above the joist support surface, and a protrusion protruding from the upper portion of the first upright portion and extending parallel to the joist support surface. The joist support surface is formed on a flat portion extending in a first direction from the female screw hole. The first upright portion is formed at one end of the joist support surface. The third upright portion is formed lower than the second upright portion at the other end of the joist support surface on the side of the female screw hole. The second upright portion is formed at a position adjacent to the female screw hole. The first upright portion and the third upright portion face both side surfaces of a joist member disposed on the joist support surface. The lower surface of the protrusion faces a part of the upper surface of the joist member. The upper surface of the second upright portion has a portion at the same height as the upper surface of the joist member. A joist receiving tool characterized by this.

2. In the joist receiving tool according to Claim 1, The upper surface of the second upright portion includes, in plan view, a first portion located on the back side of the female screw hole with respect to the first upright portion, and a second portion extending in a second direction orthogonal to the first direction from the first portion. The second portion has a portion overlapping a part of the female screw hole in the second direction in plan view. A joist receiving tool characterized by this.

3. In the joist receiving tool according to Claim 2, The side surface of the second upright portion has a concave portion curved along the female screw hole. A joist receiving tool characterized by this.

4. A double floor structure, wherein the sill receiver according to claim 1 or 2 is disposed on the floor surface, the sill member is held on the sill support surface, and the floor member is supported on the upper surfaces of the first upright upper portion and the second upright upper portion.

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