Modified construction tools

Abstract

To provide a renovation fitting capable of improving the workability of a new frame without being affected by the state of an existing frame while easily being adaptable to different new frames.SOLUTION: A renovation fitting to be attached to an existing frame placed in an opening of a building includes: a new frame composed of four perimeters; and an attachment frame that is attached to the inner circumference of the existing frame and attached around the outer circumference of the new frame. The new frame includes a new upper frame, and the attachment frame includes an upper attachment frame. The upper attachment frame has a screw fixing part through which screws pass when screwing the upper attachment frame to the new upper frame, a contact piece that protrudes from the upper attachment frame toward the new upper frame and abuts the upper face of the new upper frame when screwing to the new upper frame, and a hook piece that protrudes from the upper attachment frame toward the new upper frame and supports the new upper frame by hooking it from the outdoor side.SELECTED DRAWING: Figure 15

Description

Technical Field

[0001] The present disclosure relates to a refitted fitting.

Background Art

[0002] Conventionally, as a method of refitting an opening of a building by renovation or the like, a covering method of installing a new fitting in the opening has been adopted. In the refitted fitting refitted by this covering method, a new frame is attached to the inner peripheral side of an existing frame attached to the opening of the building (see, for example, Patent Document 1).

[0003] In the refitted fitting described in Patent Document 1, a new frame is directly attached to the inner peripheral side of the existing frame attached to the opening of the building.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the refitted fitting described in Patent Document 1, since the new frame is directly attached to the inner peripheral side of the existing frame, the attachment state of the new frame is easily affected by the distortion of the existing frame or the like, and there is room for improving workability. Further, in the refitted fitting, even when the structure of the new frame is different, it is also required to be able to easily cope without causing a difference in attachment strength. Therefore, the conventional refitted fitting has a problem that the new frame can be attached with good workability without being affected by the state of the existing frame and can easily cope with different structures of the new frame.

[0006] An object of the present disclosure is to provide a refitted fitting capable of improving the workability of a new frame without being affected by the state of an existing frame and easily coping with different new frames.

Means for Solving the Problems

[0007] The present disclosure relates to a retrofit fitting to be attached to an existing frame provided in an opening of a building, the retrofit fitting including a newly installed frame configured by assembling four sides, and an attachment frame attached to the inner peripheral side of the existing frame in a state where the four sides are assembled and attached to the outer periphery of the newly installed frame. The newly installed frame is composed of a newly installed upper frame, a newly installed lower frame, and a pair of newly installed vertical frames. The attachment frame is composed of an attachment upper frame, an attachment lower frame, and a pair of attachment vertical frames. The attachment upper frame has a screw fixing portion through which a screw passes when the attachment upper frame is screw-fixed to the newly installed upper frame, a hook piece that protrudes from the attachment upper frame toward the newly installed upper frame and hooks and supports the newly installed upper frame from the outdoor side, and a contact piece that protrudes from the attachment upper frame toward the newly installed upper frame and contacts the upper surface of the newly installed upper frame when screw-fixing to the newly installed upper frame.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The remodeling fitting 1 according to this embodiment is a remodeling fitting 1 for reforming that forms a new member while the existing frame 6 fixed to the building 100 remains attached to the building 100.

[0010] In this specification, the "viewing direction" means the surface direction of the face material of the shoji 10 in the retrofit fitting 1 housed in the opening formed in the wall of the building 100, and the "depth direction" means the thickness direction (i.e., the depth direction) of the face material. The "depth direction" is also the indoor-outdoor direction. In the drawings, the outdoor side of the retrofit fitting 1 is designated as the outdoor side X1, and the indoor side of the retrofit fitting 1 is designated as the indoor side X2. The lateral direction of the retrofit fitting 1 is referred to as the "left-right direction".

[0011] The retrofit fitting 1 according to the present embodiment is a sliding window type retrofit sash housed in the opening of the building 100. The retrofit fitting 1 is attached to the existing frame 6 provided in the opening of the building 100.

[0012] As shown in FIGS. 1 to 7, the retrofit fitting 1 includes a new frame 2, an attachment frame 3 attached to the inner side of the existing frame 6 in a state of being attached to the outer periphery of the new frame 2, indoor decorative members 41, 42, 43 (cover members), outdoor decorative covers 51, 52, 53, and shojis 10, 10 slidably housed in the new frame 2. The existing frame 6 is provided in the opening of the building 100. The new frame 2 is attached to the inner side of the existing frame 6 with the attachment frame 3 attached to the outer periphery. The attachment frame 3 is disposed between the existing frame 6 and the new frame 2.

[0013] First, the configuration of the existing frame 6 will be described. As shown in FIGS. 2 and 3, the existing frame 6 is provided inside the opening of the building 100 and is formed in a rectangular framed shape. The existing frame 6 includes an existing upper frame 61, an existing lower frame 62, and left and right existing vertical frames 63.

[0014] As shown in FIG. 2, the existing upper frame 61 is attached to the upper side of the opening of the building 100 and has guide rails 611, 612 for the existing shoji standing downward. The portion of the existing upper frame 61 on the indoor side X2 is fixed to the building 100 (the building structure).

[0015] The existing lower frame 62 is attached to the lower side of the opening of the building 100 and has guide rails 621 and 622 for existing shoji screens that stand upright upward. The portion on the indoor side X2 of the existing lower frame 62 is fixed to the building 100 (the building structure).

[0016] As shown in FIG. 3, the existing vertical frames 63 are respectively attached to the left and right vertical portions on the outdoor side X1 of the opening of the building 100. The portion on the indoor side X2 of the existing vertical frames 63 is fixed to the building 100 (the building structure).

[0017] As shown in FIGS. 8 and 9, the new frame 2 is attached to the existing frame 6 with the attachment frame 3 attached to its outer periphery. The new frame 2 is formed by assembling its four sides and is attached to the inner peripheral side of the existing frame 6 via the attachment frame 3.

[0018] The new frame 2 includes a new upper frame 21, a new lower frame 22, and left and right new vertical frames 23. In the state where the four sides of the new frame 2 are assembled, the new upper frame 21, the new lower frame 22, and the left and right new vertical frames 23 are screwed together at the combined portions. The attachment frame 3 includes an attachment upper frame 31, an attachment lower frame 32, and left and right attachment vertical frames 33.

[0019] As shown in FIG. 2, in the state where the new frame 2 with the attachment frame 3 attached to its outer periphery is attached to the existing frame 6, the new upper frame 21 is attached to the inner peripheral side (lower surface side) of the existing upper frame 61 with the attachment upper frame 31 sandwiched therebetween. The new upper frame 21 is formed of, for example, a metal material or a resin material and has guide rails 211 and 212 on the upper side of the upper portions of the shoji screens 10, 10 that stand upright downward. A resin angle member 213 is provided on the indoor side X2 of the new upper frame 21. The resin angle member 213 is arranged with a gap between it and the frame member 101.

[0020] The newly installed upper frame 21 is divided into two parts in the prospective direction into an outdoor side frame part 21A and an indoor side frame part 21B, and has a structure in which the space between the outdoor side frame part 21A and the indoor side frame part 21B is integrally connected by a resin bridge material 214. The resin bridge material 214 blocks the heat transfer in the indoor-outdoor direction in the newly installed upper frame 21. Therefore, the newly installed upper frame 21 has excellent heat insulation properties.

[0021] In a state where the newly installed frame 2 with the attachment frame 3 attached to the outer periphery is attached to the existing frame 6, as shown in FIG. 2, the newly installed lower frame 22 is attached to the inner peripheral side of the existing lower frame 62 with the attachment lower frame 32 interposed therebetween. The newly installed lower frame 22 is formed of, for example, a metal material or a resin material, and has guide rails 221 and 222 on the lower side of the shoji 10, 10 standing upright upward. A resin angle member 223 is provided on the indoor side X2 of the newly installed lower frame 22. The resin angle member 223 is arranged with a space between it and the frame member 101.

[0022] The newly installed lower frame 22 is divided into two parts in the prospective direction into an outdoor side frame part 22A and an indoor side frame part 22B, and has a structure in which the space between the outdoor side frame part 22A and the indoor side frame part 22B is integrally connected by a resin bridge material 224. The resin bridge material 224 blocks the heat transfer in the indoor-outdoor direction in the newly installed lower frame 22. Therefore, the newly installed lower frame 22 has excellent heat insulation properties.

[0023] In a state where the newly installed frame 2 with the attachment frame 3 attached to the outer periphery is attached to the existing frame 6, as shown in FIG. 3, the newly installed vertical frame 23 is attached to the inner peripheral side of the existing vertical frame 63 with the attachment vertical frame 33 interposed therebetween. The newly installed vertical frame 23 is formed of, for example, a metal material or a resin material. A resin angle member 233 is provided on the indoor side X2 of the newly installed vertical frame 23. The resin angle member 233 is arranged with a space between it and the frame member 101.

[0024] The above-described new frame 2 (new upper frame 21, new lower frame 22, and left and right new vertical frames 23) is attached to the inner peripheral side of the existing frame 6 (existing upper frame 61, existing lower frame 62, and left and right existing vertical frames 63) in a state where the attachment frame 3 (attachment upper frame 31, attachment lower frame 32, and left and right attachment vertical frames 33) is assembled around the outer periphery.

[0025] The attachment frame 3 is attached by assembling around the outer periphery of the new frame 2. The attachment frame 3 is attached to the inner peripheral side of the existing frame 6 in a state where it is assembled around the outer periphery of the new frame 2.

[0026] As shown in FIGS. 8 and 9, the attachment frame 3 is configured by arranging the attachment upper frame 31, the attachment lower frame 32, and a pair of attachment vertical frames 33 around the four sides and assembling them into a rectangle. The attachment upper frame 31, the attachment lower frame 32, and the left and right attachment vertical frames 33 are each formed of, for example, an aluminum material.

[0027] The attachment upper frame 31 is disposed at the upper part of the attachment frame 3 and extends in the left-right direction (horizontal direction). The attachment lower frame 32 is disposed on the lower side of the attachment frame 3 and extends in the left-right direction (horizontal direction). The attachment vertical frame 33 is disposed at the end side in the left-right direction of the attachment frame 3 and extends in the up-down direction.

[0028] As shown in FIGS. 8 and 9, the attachment frame 3 is configured by a so-called vertical-over structure in which the longitudinal ends of the attachment vertical frames 33 are disposed outside the longitudinal ends of the attachment upper frame 31 and the attachment lower frame 32 so as to cover the longitudinal ends of the attachment upper frame 31 and the attachment lower frame 32.

[0029] When the attachment frame 3 is attached to the inner circumferential side of the existing frame 6, it is disposed between the new frame 2 and the existing frame 6. As shown in FIG. 10, the attachment upper frame 31 is placed on the upper surface of the new upper frame 21 and then, as shown in FIGS. 2 and 15, is fixed to the new upper frame 21 by fixing screws 31a penetrating from the attachment upper frame 31 across the new upper frame 21 and fixing screws 31b penetrating from the new upper frame 21 across the attachment upper frame 31. As shown in FIG. 11, the attachment lower frame 32 is attached in a state of being hooked on the new lower frame 22 and then, as shown in FIG. 2, is fixed to the new lower frame 22 by fixing screws 32a and 32b penetrating from the attachment lower frame 32 across the new lower frame 22. As shown in FIGS. 12 and 13, the attachment vertical frame 33 is attached in a state of being hooked on the new vertical frame 23.

[0030] The attachment frame 3 has the attachment upper frame 31, the attachment lower frame 32, and a pair of attachment vertical frames 33 attached to the outer circumference of the new frame 2. In the attachment upper frame 31, the attachment lower frame 32, and the pair of attachment vertical frames 33, at the assembly portions of any two frames, they are screwed to each other. Specifically, screws are used to fix the upper and lower end portions of each of the pair of attachment vertical frames 33 to both longitudinal ends of the attachment upper frame 31 respectively, and screws are used to fix the upper and lower end portions of each of the pair of attachment vertical frames 33 to both longitudinal ends of the attachment lower frame 32 respectively.

[0031] As shown in FIGS. 2 and 10, the attachment upper frame 31 is divided into two in the prospective direction into an outdoor side frame portion 31A and an indoor side frame portion 31B, and between the outdoor side frame portion 31A and the indoor side frame portion 31B, there is a structure integrally connected by a resin bridge material 311. The resin bridge material 311 blocks the heat transfer in the indoor-outdoor direction through the attachment upper frame 31. Therefore, the attachment upper frame 31 has excellent heat insulation properties.

[0032] As shown in FIGS. 2, 10, and 15, the outdoor side frame portion 31A of the attachment upper frame 31 includes an outdoor side upward extending plate portion 312 (a finding direction extending plate portion), an indoor-outdoor direction extending portion 313, a first hollow portion 314, a screw fixing portion 315, an L-shaped hook piece 316a, and an outdoor side lower contact piece 316b. The indoor side frame portion 31B of the attachment upper frame 31 includes a second hollow portion 317 and an indoor side horizontally extending plate 318. The upper surface 314a of the first hollow portion 314 and the upper surface 317a of the second hollow portion 317 are arranged at the same height and form a flat same plane.

[0033] The outdoor side upward extending plate portion 312 is formed in a plate shape that extends upward from the end portion on the outdoor side X1 of the indoor-outdoor direction extending portion 313. The outdoor side upward extending plate portion 312 is arranged on the outdoor side X1 and extends upward (the upward direction in the finding direction). A pair of engaging protrusions 312a are formed on the lower side of the surface on the outdoor side X1 of the outdoor side upward extending plate portion 312 and are arranged at a vertical distance from each other. A pair of engaging protrusions 51a of the outdoor side decorative cover 51 are engaged and attached to the pair of engaging protrusions 312a.

[0034] The indoor-outdoor direction extending portion 313 extends from the lower end portion of the outdoor side upward extending plate portion 312 toward the indoor side X2. The indoor-outdoor direction extending portion 313 functions as a water accumulation portion when water such as rain infiltrates from the outdoor side X1. The first hollow portion 314 is arranged at the innermost side on the indoor side X2 of the outdoor side frame portion 310A. As shown in FIGS. 10 and 15, the upper surface 314a of the first hollow portion 314 is arranged above the indoor-outdoor direction extending portion 313. The screw fixing portion 315 is arranged between the indoor-outdoor direction extending portion 313 and the first hollow portion 314. The screw fixing portion 315 is a base portion through which a fixing screw 31a for fixing the attachment upper frame 31 to the outer peripheral side of the new upper frame 21 penetrates from above the attachment upper frame 31 toward the new upper frame 21, and extends along the longitudinal direction of the attachment upper frame 31.

[0035] The screw fixing portion 315 is disposed below the upper surface 314a of the first hollow portion 314 but above the bottom surface of the indoor-outdoor direction extending portion 313. Therefore, even if water infiltrates onto the indoor-outdoor direction extending portion 313 from the outdoor side X1, the water stays on the indoor-outdoor direction extending portion 313 whose bottom surface is disposed lower than the screw fixing portion 315 and does not infiltrate onto the screw fixing portion 315. Accordingly, there is no risk of water leakage from the attachment upper frame 31 to the new installation upper frame 21 side through the fixing screw 31a penetrating the screw fixing portion 315, and the waterproof property of the attachment upper frame 31 is improved. The water on the indoor-outdoor direction extending portion 313 is drained from the end of the indoor-outdoor direction extending portion 313 into the inside of the attachment vertical frame 33.

[0036] The L-shaped hook piece 316a is disposed on the lower surface of the indoor-outdoor direction extending portion 313, protrudes downward toward the new installation upper frame 21, and has a shape bent in an L-shape toward the indoor side X2. The L-shaped hook piece 316a is a portion that serves as an attachment portion when attaching by hooking the new installation upper frame 21. The attachment structure of the new installation upper frame 21 using this L-shaped hook piece 316a will be described later.

[0037] The outdoor lower contact piece 316b is integrally provided at the lower end portion of the L-shaped hook piece 316a and protrudes toward the outdoor side X1. The outdoor lower contact piece 316b is formed in a plate shape having a predetermined width in the prospective direction and is slightly downwardly inclined toward the outdoor side along the inclination of the upper surface 21a on the outdoor side of the new installation upper frame 21. The outdoor lower contact piece 316b is placed on the upper surface 21a of the new installation upper frame 21 via a packing member 319a made of resin or rubber or the like between it and the upper surface 21a of the new installation upper frame 21. The attachment upper frame 31 is fixed to the new installation upper frame 21 by a fixing screw 31a penetrating the screw fixing portion 315 and a fixing screw 31b penetrating from the new installation upper frame 21 toward the second hollow portion 317 in a state where the outdoor lower contact piece 318 is placed on the upper surface 21a of the new installation upper frame 21. Since the outdoor lower contact piece 316b is formed in a plate shape having a predetermined width in the prospective direction, the outdoor side X1 of the attachment upper frame 31 can be stably attached to the upper surface 21a of the outdoor side X1 of the new installation upper frame 21.

[0038] As shown in FIGS. 14 and 15, the resin bridge member 311 of the attachment upper frame 31 is provided across the opposing side surfaces 314b and 317b of the first hollow portion 314 and the second hollow portion 317 of the attachment upper frame 31. Specifically, a plurality of groove portions 314c and 317c extending in the longitudinal direction of the attachment upper frame 31 are provided in parallel in the vertical direction on the side surfaces 314b and 317b, respectively. The resin bridge member 311 is composed of a plurality of long strip-shaped bridge portions 311a and 311b along the longitudinal direction of the outdoor side frame portion 31A and the indoor side frame portion 31B, respectively. By fitting both end portions in the width direction of the strip-shaped bridge portions 311a and 311b across the groove portions 314c and 317c, respectively, the outdoor side frame portion 31A and the indoor side frame portion 31B are integrally connected.

[0039] Since the resin bridge member 311 is composed of a plurality of strip-shaped bridge portions, it is possible to appropriately adjust the number, interval, and thickness of the strip-shaped bridge portions according to the vertical thickness of the outdoor side frame portion 31A and the indoor side frame portion 31B of the attachment upper frame 31. That is, by appropriately adjusting the number, interval, and thickness of the strip-shaped bridge portions having the same shape, it is possible to easily cope with attachment upper frames of different thicknesses.

[0040] On the lower surface side of the resin bridge member 311 in the attachment upper frame 31, a packing member 319b made of resin or rubber is disposed across the outdoor side frame portion 31A and the indoor side frame portion 31B, preventing the outdoor side frame portion 31A and the indoor side frame portion 31B from being thermally connected via the new upper frame 21. Further, as shown in FIG. 10, in a state where the attachment upper frame 31 is overlaid on the new upper frame 21, the outdoor side frame portion 31A of the attachment upper frame 31 is overlaid on the outdoor side frame portion 21A of the new upper frame 21, and the indoor side frame portion 31B of the attachment upper frame 31 is overlaid on the indoor side frame portion 21B of the new upper frame 21. Therefore, heat is not transmitted in the indoor-outdoor direction through the outdoor side frame portions 21A, 31A and the indoor side frame portions 21B, 31B of the new upper frame 21 and the attachment upper frame 31.

[0041] The upper surfaces of the outdoor frame portion 31A and the indoor frame portion 31B of the attachment upper frame 31 are formed by the upper surface 314a of the first hollow portion 314 and the upper surface 317a of the second hollow portion 317. These upper surfaces 314a and 317a constitute a flat surface at the same height. In the present embodiment, as shown in FIG. 10, on the outer peripheral side of the attachment upper frame 31, from the indoor side X2 toward the outdoor side X1, from the upper space of the upper surface 314a of the first hollow portion 314 and the upper surface 317a of the second hollow portion 317 to the space in front of the outdoor-side upward extending plate portion 312, and from the space in front of the outdoor-side upward extending plate portion 312 to the space extending upward, as shown by the virtual line (two-dot chain line), an L-shaped space S1 is formed. The L-shaped space S1 is formed along the indoor-side X2 surface of the outdoor-side downward contact piece of the outdoor-side upward extending plate portion 312, the upper surface 314a of the first hollow portion 314, and the upper surface 317a of the second hollow portion 317 on the outer peripheral side of the attachment upper frame 31.

[0042] Thereby, since the existing upper frame 61 can be accommodated in the L-shaped space S1, the attachment frame 3 with the new frame 2 attached can be easily attached to the existing frame 6. In particular, in the present embodiment, since the upper surface 314a of the first hollow portion 314 and the upper surface 317a of the second hollow portion 317 are formed along the indoor-outdoor direction of the attachment upper frame 31, the attachment upper frame 31 with the new upper frame 21 attached can be attached to the existing upper frame 61 so as not to interfere when attaching, corresponding to existing frames 6 of various shapes.

[0043] The indoor-side horizontal extension plate 318 is disposed at the end of the attachment upper frame 31 on the most indoor side X2. The indoor-side horizontal extension plate 318 extends horizontally from the end of the upper surface 317a of the second hollow portion 317 on the indoor side X2 toward the indoor side X2. The indoor-side horizontal extension plate 318 is disposed on the same plane as the upper surface 317a of the second hollow portion 317 and is formed in a planar shape over the entire longitudinal direction of the attachment upper frame 31.

[0044] As shown in Fig. 2, when the indoor-side horizontal extension plate 318 fixes the attachment frame 3 to the building 100 (the main body), the mounting screws 34 are arranged to penetrate through it. Thereby, the indoor-side horizontal extension plate 318 is fixed to the building 100 (the main body) by the mounting screws 34. When a gap is formed between the indoor-side horizontal extension plate 318 and the frame member 101, the spacer member 341 is arranged. The spacer member 341 is composed of a plurality of sheets, and the thickness of the sheet for filling the gap is set according to the size of the gap between the indoor-side horizontal extension plate 318 and the frame member 101.

[0045] As shown in Figs. 2 and 10, the attachment lower frame 32 is divided into two parts in the looking direction into an outdoor-side frame part 32A and an indoor-side frame part 32B, and has a structure in which the space between the outdoor-side frame part 32A and the indoor-side frame part 32B is integrally connected by a resin bridge material 321. The resin bridge material 321 blocks the heat transfer in the indoor-outdoor direction through the attachment lower frame 32, and the heat insulation performance is improved.

[0046] As shown in Figs. 2 and 11, the outdoor-side frame part 32A of the attachment lower frame 32 has an outdoor-side downward extending plate part 322 (a looking-direction extending plate part), an indoor-outdoor direction extending part 323, and an indoor-side upward extending plate part 324. The indoor-side frame part 32B of the attachment lower frame 32 has a hollow part 325, an L-shaped hanging piece 326, an indoor-side upward extending plate 327, and an indoor-side horizontal extension plate 328.

[0047] The outdoor-side downward extending plate part 322 is formed in a plate shape extending downward from the end of the outdoor side X1 of the indoor-outdoor direction extending part 323. The outdoor-side downward extending plate part 322 is arranged on the outdoor side X1 and extends downward (the downward direction in the looking direction). A pair of engaging protrusions 322a arranged vertically apart are formed above the surface of the outdoor side X1 of the outdoor-side downward extending plate part 322. A pair of engaging protrusions 52a of the outdoor-side decorative cover 52 are engaged and attached to the pair of engaging protrusions 322a.

[0048] The indoor / outdoor direction extending portion 323 extends from the lower end portion of the outdoor-side downward extending plate portion 322 toward the indoor side X2. The indoor / outdoor direction extending portion 323 is a portion through which the fixing screw 32a for fixing the attachment lower frame 32 to the outer peripheral side of the newly installed lower frame 22 penetrates from below the attachment lower frame 32 toward the newly installed lower frame 22, and extends along the longitudinal direction of the attachment lower frame 32. The indoor-side upward extending plate portion 324 extends upward from the end portion on the indoor side X2 of the indoor / outdoor direction extending portion 323 and faces the side surface 325a on the outdoor side X1 of the hollow portion 325 of the indoor-side frame portion 32B disposed on the indoor side X2 side.

[0049] As shown in FIG. 18, the resin bridge member 321 of the attachment lower frame 32 is provided across the indoor-side upward extending plate portion 324 of the outdoor-side frame portion 32A and the side surface 325a on the outdoor side X1 of the hollow portion 325 of the indoor-side frame portion 32B. Specifically, a plurality of groove portions 324b and 325b extending in the longitudinal direction of the attachment lower frame 32 are provided in parallel in the vertical direction on the side surface 324a on the indoor side X2 of the indoor-side upward extending plate portion 324 and the side surface 325a on the outdoor side X1 of the hollow portion 325, respectively. The resin bridge member 321 is composed of a plurality of long strip-shaped bridge portions 321a and 321b extending along the longitudinal direction of the outdoor-side frame portion 32A and the indoor-side frame portion 32B, respectively. By fitting both end portions in the width direction of the strip-shaped bridge portions 321a and 321b across the groove portions 324b and 325b, respectively, the outdoor-side frame portion 32A and the indoor-side frame portion 32B are integrally connected.

[0050] Since the resin bridge member 321 is composed of a plurality of strip-shaped bridge portions, it is possible to appropriately adjust the number, interval, and thickness of the strip-shaped bridge portions according to the vertical thickness of the outdoor-side frame portion 32A and the indoor-side frame portion 32B of the attachment lower frame 32. That is, by appropriately adjusting the number, interval, and thickness of the strip-shaped bridge portions having the same shape, it is possible to easily cope with attachment lower frames having different thicknesses.

[0051] On the upper surface side of the resin bridge material 321 in the attachment lower frame 32, a packing member 329 made of resin, rubber, or the like is disposed across the outdoor frame portion 32A and the indoor frame portion 32B to prevent the outdoor frame portion 32A and the indoor frame portion 32B from being thermally connected via the newly installed lower frame 22. Further, as shown in FIG. 11, in a state where the attachment lower frame 32 is overlapped with the newly installed lower frame 22, the outdoor frame portion 32A of the attachment lower frame 32 is overlapped with the outdoor frame portion 22A of the newly installed lower frame 22, and the indoor frame portion 32B of the attachment lower frame 32 is overlapped with the indoor frame portion 22B of the newly installed lower frame 22. Therefore, heat is not transmitted in the indoor-outdoor direction through the outdoor frame portions 22A, 32A and the indoor frame portions 22B, 32B of the newly installed lower frame 22 and the attachment lower frame 32, respectively.

[0052] The lower surface of the attachment lower frame 32 is formed in a planar shape so as not to contact the inner peripheral side of the existing frame 6 when the attachment frame 3 with the newly installed frame 2 attached is attached to the inner peripheral side of the existing frame 6. In the present embodiment, as shown in FIG. 11, on the outer peripheral side of the attachment lower frame 32, from the indoor side X2 toward the outdoor side X1, up to the space in front of the outdoor downward extending plate portion 322 and the space from the space in front of the outdoor downward extending plate portion 322 toward the lower side, an L-shaped space S2 is formed as indicated by a virtual line (two-dot chain line). The L-shaped space S2 is formed along the surface of the indoor side X2 of the outdoor downward extending plate portion 322 and the lower surface of the attachment lower frame 32 on the outer peripheral side of the attachment lower frame 32.

[0053] As a result, since the existing lower frame 62 can be accommodated in the L-shaped space S2, the attachment frame 3 with the new frame 2 attached can be easily attached to the existing frame 6. In particular, in the present embodiment, as shown in FIG. 2, since the lower surface of the attachment lower frame 32 is formed along the indoor-outdoor direction of the attachment lower frame 32, the attachment lower frame 32 with the new lower frame 22 attached can be attached to the existing lower frame 62 so as not to interfere with the attachment for various shapes of the existing frame 6. When attaching the attachment frame 3 with the new frame 2 attached to the existing frame 6, it is attached in a tilted state such that the lower end side is located closer to the existing frame 6 side than the upper end side. Therefore, after the existing lower frame 62 enters the L-shaped space S2, the entire attachment frame 3 is attached to the existing frame 6. Therefore, by accommodating the L-shaped space S2 in the existing lower frame 62, the attachment frame 3 with the new frame 2 attached can be easily attached to the existing frame 6.

[0054] The L-shaped hook piece 326 is disposed on the upper surface of the indoor-outdoor direction extending portion 323, protrudes upward toward the new lower frame 22, and has a shape bent in an L-shape toward the outdoor side X1. As shown in FIG. 11, when attaching the new lower frame 22, the L-shaped hook piece 326 engages with the new lower frame 22 on the outdoor side X1 by being hooked on a hook piece 225 that protrudes downward on the outdoor side X1 of the new lower frame 22. In this state, the outdoor side X1 of the attachment lower frame 32 is fixed by a fixing screw 32a that penetrates the indoor-outdoor direction extending portion 323 from the new lower frame 22, as shown in FIG. 2.

[0055] The indoor upward extending plate 327 is disposed at the end of the attachment lower frame 32 on the innermost indoor side X2. The indoor upward extending plate 327 extends upward from the end of the upper surface of the hollow portion 325 on the indoor side X2 and is formed in a planar shape over the entire longitudinal direction of the attachment lower frame 32. As shown in FIGS. 2 and 11, the indoor upward extending plate 327 abuts against the indoor side X2 side surface of the indoor downward extending plate 226 that extends downward from the end of the indoor side X2 of the new installation lower frame 22 when the attachment lower frame 32 is attached to the new installation lower frame 22. In this state, the indoor side X2 of the attachment lower frame 32 is fixed by a fixing screw 32b that horizontally penetrates the indoor downward extending plate 226 of the new installation lower frame 22 from the indoor upward extending plate 327 of the attachment lower frame 32 toward the outdoor side X1 from the indoor side X2, as shown in FIG. 2.

[0056] The indoor horizontal extending plate 328 is disposed at the end of the attachment lower frame 32 on the innermost indoor side X2. The indoor horizontal extending plate 328 extends horizontally from the end of the lower surface of the hollow portion 325 on the indoor side X2 toward the indoor side X2 and is formed in a planar shape over the entire longitudinal direction of the attachment lower frame 32. As shown in FIG. 2, when the attachment frame 3 is fixed to the building 100 (structure), the mounting screw 35 is disposed to penetrate through the indoor horizontal extending plate 328. Thereby, the indoor horizontal extending plate 328 is fixed to the building 100 (structure) by the mounting screw 35.

[0057] The attachment vertical frame 33 is arranged in a so-called vertical-lapping structure in which the longitudinal ends of the attachment vertical frame 33 are disposed outside the longitudinal ends of the attachment upper frame 31 and the attachment lower frame 32. As shown in FIGS. 3, 12, and 13, the attachment vertical frame 33 has a hollow portion 331, an outdoor side left-right extending plate portion 332 (finding direction extending plate portion), an indoor side indoor direction extending portion 333 (extending plate), an indoor side side extending portion 334, and a hook piece 335.

[0058] The hollow portion 331 of the attachment vertical frame 33 is formed in an elongated rectangular hollow shape extending in the indoor-outdoor direction. On the outer surfaces of the hollow portion 331 in the left-right direction, outer peripheral side planes 331a are formed. The outer peripheral side planes 331a are formed on the outer peripheral side of the attachment frame 3 in the attachment vertical frame 33. The outer peripheral side planes 331a face the existing vertical frame 63 and are formed in a planar shape extending in the indoor-outdoor direction and the up-down direction. The outer peripheral side planes 331a are formed over the entire longitudinal direction of the attachment vertical frame 33 and face the outside in the left-right direction.

[0059] The outer peripheral side planes 331a are formed in a planar shape so as not to hit the inner peripheral side of the existing frame 6 when attaching the attachment frame 3 with the new frame 2 attached to the inner peripheral side of the existing frame 6. In the present embodiment, as shown in FIGS. 12 and 13, on the outer peripheral side of the attachment vertical frame 33, from the indoor side X2 toward the outdoor side X1, an L-shaped space S3 is formed by the space outside the outer peripheral side plane 331a in the left-right direction and the space on the indoor side of the outdoor side left-right extending plate portion 332, as indicated by the virtual line (two-dot chain line). The L-shaped space S3 is formed along the indoor side X2 surface and the outer peripheral side plane 331a of the outdoor side left-right extending plate portion 332 on the outer peripheral side of the attachment vertical frame 33.

[0060] Thereby, since the existing vertical frame 63 can be accommodated in the L-shaped space S3, the attachment frame 3 with the new frame 2 attached can be easily attached to the existing frame 6. In particular, in the present embodiment, as shown in FIG. 3, since the outer peripheral side plane 331a is formed along the indoor-outdoor direction of the attachment vertical frame 33, the attachment vertical frame 33 with the new vertical frame 23 attached can be attached to the existing vertical frame 63 so as not to interfere when attaching, corresponding to existing frames 6 of various shapes.

[0061] The indoor side indoor direction extending portion 333 extends from the end on the indoor side X2 of the end on the outer side in the left-right direction of the hollow portion 331 toward the indoor side X2, as shown in FIG. 3. The indoor side plane 333a is formed in a planar shape over the entire longitudinal direction of the attachment vertical frame 33.

[0062] When attaching the attachment frame 3 to the building 100 (frame), the indoor-side indoor-direction extending portion 333 is arranged such that the mounting screws 36 penetrate it. Thus, the indoor-side indoor-direction extending portion 333 is fixed to the building 100 (frame) by the mounting screws 36. When a gap is formed between the indoor-side indoor-direction extending portion 333 and the frame member 101, a spacer member 361 is arranged. The spacer member 361 is composed of a plurality of sheets, and the thickness of the sheet for filling the gap is set according to the size of the gap between the indoor-side indoor-direction extending portion 333 and the frame member 101.

[0063] On the outdoor-side X1 surface of the hollow portion 331, a pair of engaging protrusions 331b are formed and arranged at a distance from each other left and right. A pair of engaging protrusions 53a of the outdoor-side decorative cover 53 are engaged and attached to the pair of engaging protrusions 331b.

[0064] The outdoor-side left-right direction extending plate portion 332 is formed in a plate shape that extends outward in the left-right direction from the end of the outdoor-side X1 of the hollow portion 331. The outdoor-side left-right direction extending plate portion 332 is arranged on the outdoor-side X1 and extends in the left-right direction (the finding direction). The indoor-side side extending portion 334 extends inward in the left-right direction from the end of the indoor-side X2 of the hollow portion 331.

[0065] The hook piece 335 protrudes from the end of the indoor-side X1 of the hollow portion 331 in the left-right direction toward the outdoor-side X1. When attaching the attachment vertical frame 33 to the newly installed vertical frame 23, as shown in FIGS. 12 and 13, the hook piece 335 is hooked on a hook piece 231 provided at the end of the outdoor-side X1 of the newly installed vertical frame 23. Note that the structure for fixing the attachment vertical frame 33 to the newly installed vertical frame 23 may be a structure for fastening by screwing or the like instead of a hooking structure.

[0066] The indoor decorative members 41, 42, and 43 are cover members respectively attached to the resin angle members 213, 223, and 233 of the new frame 2 as shown in FIGS. 2 and 3. The indoor decorative members 41, 42, and 43 cover the indoor side surfaces f1, f2, and f3 that face the most indoor side X2 formed by the new frame 2 and the attachment frame 3. The boundary between the indoor decorative members 41, 42, and 43 and the inner peripheral surface of the frame member 101 is shielded by a parting material 45 with an L-shaped cross section fixed to the frame member 101.

[0067] The indoor decorative members 41, 42, and 43 each have a cover body 46 and a cover attachment portion 47. In the indoor decorative members 41, 42, and 43, the cover attachment portions 47 are respectively attached to the resin angle members 213, 223, and 233 of the new frame 2. The cover body 46 in a state of being attached to the resin angle members 213, 223, and 233 has predetermined space portions S11, S12, and S13 between it and the indoor side surfaces f1, f2, and f3 of the new frame 2 and the attachment frame 3. The space portions S11, S12, and S13 extend along the longitudinal direction of the indoor decorative members 41, 42, and 43 respectively.

[0068] In the space portions S11, S12, and S13 between the cover body 46 and the indoor side surfaces f1, f2, and f3, first heat insulating materials 46a are respectively accommodated. The first heat insulating materials 46a are made of resin, specifically extruded polystyrene foam, bead polystyrene, urethane resin, or rubber, and are accommodated over the entire longitudinal direction of the space portions S11, S12, and S13. By accommodating the first heat insulating materials 46a in the space portions S11, S12, and S13, the heat transfer from the outdoor side X1 to the indoor side X2 of the refitted fitting 1 is suppressed, and the heat insulating performance of the refitted fitting 1 is improved.

[0069] The cover body 46 of the indoor decorative members 41, 42, and 43 each has a cover body hollow portion 461 extending in the longitudinal direction of the cover body 46. The cover body hollow portion 461 is formed in a rectangular cross-sectional shape and is arranged at the inner peripheral side and the corner portion of the indoor side X2 of the indoor decorative members 41, 42, and 43. The cover body hollow portion 461 extends along the longitudinal direction of the indoor decorative members 41, 42, and 43 respectively.

[0070] Inside the hollow portion 461 of the cover body, the second heat insulating material 46b is filled respectively. The second heat insulating material 46b is made of, for example, resin, specifically, extrusion method polystyrene foam, bead method polystyrene, urethane resin, or rubber, and is filled over the entire longitudinal direction of the hollow portion 461 of the cover body. By filling the second heat insulating material 46b in the hollow portion 461 of the cover body, the heat transfer from the outdoor side X1 to the indoor side X2 of the retrofit fitting 1 is further suppressed, and the heat insulating performance of the retrofit fitting 1 is further improved. The cover body 46 of the indoor side decorative members 41, 42, 43 may be provided with only the first heat insulating material 46a, or may be provided with only the second heat insulating material 46b.

[0071] In the construction method of the retrofit fitting 1 of the present embodiment, the first heat insulating material 46a is arranged along the indoor side surfaces f1, f2, f3 of the new installation frame 2 and the attachment frame 3 before attaching the indoor side decorative members 41, 42, 43. The second heat insulating material 46b is pre-filled inside the hollow portion 461 of the cover body at a manufacturing factory or the like of the indoor side decorative members 41, 42, 43. The indoor side decorative members 41, 42, 43 are attached to the resin angle members 213, 223, 233 of the new installation frame 2 from the indoor side X2 of the retrofit fitting 1 after the first heat insulating material 46a is arranged in the space portions S11, S12, S13, and are respectively attached by screws 48. Thereby, a heat insulating function can be further added to the indoor side X2 of the retrofit fitting 1, and the heat insulating performance of the retrofit fitting 1 can be easily improved.

[0072] Next, the case of hooking and attaching the attachment upper frame 31 to the new installation upper frame will be described. The new installation upper frame 20 shown in FIGS. 16 and 17 shows a new installation upper frame for a decorative window. This new installation upper frame 20 has a hooking piece 215 on the outdoor side X1 that can be engaged with the L-shaped hooking piece 316a of the attachment upper frame 31. The hooking piece 215 protrudes toward the outdoor side X1.

[0073] When attaching the attachment upper frame 31 to the new upper frame 20 having the engaging piece 215, on the outdoor side X1, the L-shaped engaging piece 316a of the attachment upper frame 31 is hooked and attached to the engaging piece 215 of the new upper frame 20. That is, in the case of the new upper frame 21 without the engaging piece, the attachment upper frame 31 is attached by placing the outdoor-side lower contact piece 316b provided at the lower end of the L-shaped engaging piece 316a on the upper surface 21a of the outdoor side X1 of the new upper frame 21. In the case of the new upper frame 20 having the engaging piece 215, the attachment upper frame 31 is attached by placing the L-shaped engaging piece 316a on the upper surface 21a of the outdoor side X1 of the engaging piece 215 of the new upper frame 20.

[0074] In this way, the attachment upper frame 31 of the present embodiment can be commonly used in both the case where the new upper frame does not have the engaging piece and the case where the new upper frame has the engaging piece, and the same attachment strength can be ensured for any new upper frame. Since the outdoor-side lower contact piece 316b is integrally provided at the lower end of the L-shaped engaging piece 316a, the structure of the attachment upper frame 31 can be simplified.

[0075] As shown in FIG. 2, between the attachment lower frame 32 and the existing lower frame 62 in the attachment frame 3 attached to the outer peripheral side of the new frame 2, a reinforcing member 7 for receiving the loads of the new frame 2 and the attachment frame 3 is provided. The reinforcing member 7 is formed of a material having load-bearing properties such as, for example, hard resin, ceramics, CFRP (Carbon Fiber Reinforced Plastics), metal, etc., and is formed in a plate shape having a predetermined width in the expected direction. The reinforcing member 7 may be a long member extending along the longitudinal direction of the attachment lower frame 32, or may be a plurality of short members arranged at intervals in the longitudinal direction of the attachment lower frame 32.

[0076] As shown in Fig. 11, on the lower surface of the attachment lower frame 32 of the present embodiment, flat surfaces 320a and 320b are formed from the outdoor side frame portion 32A facing the existing lower frame 62 to the middle portion of the indoor side frame portion 32B. At the end of the flat surface 320b on the indoor side X2 of the indoor side frame portion 32B, a stepped portion 320c bent downward is formed. On the lower surface of the outdoor side frame portion 32A, an engaging piece 320d bent in an L shape toward the indoor side X2 is provided. At the lower end of the stepped portion 320c of the indoor side frame portion 32B, an engaging piece 320e extending toward the outdoor side X1 is provided. The reinforcing member 7 is disposed in the space surrounded by the flat surfaces 320a and 320b and the engaging pieces 320d and 320e, and is engaged with the engaging pieces 320d and 320e. Thereby, the reinforcing member 7 is disposed on the outer peripheral surface side of the attachment lower frame 32.

[0077] As shown in Fig. 2, the end of the reinforcing member 7 on the outdoor side X1 is disposed between the flat surface 320a of the outdoor side frame portion 32A and the guide rail 622 of the existing lower frame 62. The guide rail 622 is disposed below the outdoor side frame portion 32A and is a protruding piece protruding upward from the existing lower frame 62. The end of the reinforcing member 7 on the indoor side X2 is disposed between the flat surface 320b of the indoor side frame portion 32B and the frame member 101. Thereby, the entire load of the new frame 2 and the attachment frame 3 applied particularly to the attachment lower frame 32 can be supported from below by the reinforcing member 7. Further, since the reinforcing member 7 of the present embodiment is placed on the guide rail 622 of the existing lower frame 62 on the outdoor side X1 and on the frame member 101 on the indoor side X2, the entire load of the new frame 2 and the attachment frame 3 can be stably supported.

[0078] The reinforcing member 7 is disposed so as to cover the lower side of the resin bridge material 321 across the outdoor side frame portion 32A and the indoor side frame portion 32B that are connected via the resin bridge material 321 in the attachment lower frame 32. Therefore, it is possible to reinforce the portion of the resin bridge material 321 that is relatively vulnerable to the load from above. Moreover, when the reinforcing member 7 is formed of a non-metallic material with low thermal conductivity, there is no possibility of heat being transferred between the outdoor side frame portion 32A and the indoor side frame portion 32B via the reinforcing member 7. When the reinforcing member 7 includes a metal material, as shown in FIG. 18, it is desirable to provide a heat insulating layer 71 made of a non-metallic material with low thermal conductivity such as resin or rubber on at least the upper surface side that abuts against the attachment lower frame 32.

[0079] The reinforcing member 7 is fixed to the flat surface 320b of the indoor side frame portion 32B by screws 7a in a state of being accommodated in the reinforcing member accommodation space S30 of the attachment lower frame 32, as shown in FIG. 2. Since the reinforcing member 7 can be pre-attached to the attachment lower frame 32 before it is attached to the new lower frame 22, the workability when assembling the retrofit fitting 1 is improved. However, since the attachment lower frame 32 of the present embodiment engages the reinforcing member 7 with the engaging pieces 320d and 320e, it is not always necessary to fix the reinforcing member 7 with the screws 7a. The reinforcing member 7 may be adhered to the attachment lower frame 32 with a double-sided tape or the like.

[0080] As shown in FIGS. 2, 11, and 18, the lower surface side of the outdoor side frame portion 22A of the new lower frame 22 has an inclined surface 227 that slopes downward from the outdoor side X1 toward the indoor side X2. The inclined surface 227 is formed by the lower surface of the first hollow portion 228 provided in the outdoor side frame portion 22A of the new lower frame 22 and a protruding piece that is disposed on the indoor side X2 and slopes downward toward the indoor side X2.

[0081] A spacer member 8 is provided on the upper surface of the indoor-outdoor direction extending portion 323 of the attachment lower frame 32 corresponding to the lower side of the inclined surface 227 of the newly installed lower frame 22. The spacer member 8 is formed, for example, in a block shape from a resin material, and when the attachment lower frame 32 is attached to the newly installed lower frame 22, it abuts against the inclined surface 227 and has an upper surface 81 that slopes downward toward the indoor side X2 along the inclination of the inclined surface 227. The spacer member 8 may be a long member extending along the longitudinal direction of the attachment lower frame 32, or may be a plurality of short members arranged at intervals along the longitudinal direction of the attachment lower frame 32.

[0082] As shown in FIG. 18, the spacer member 8 has a protrusion 82 that protrudes downward at the end on the outdoor side X1. The protrusion 82 is inserted into and engaged with a groove portion 323a provided on the upper surface of the indoor-outdoor direction extending portion 323 of the outdoor side frame portion 32A of the attachment lower frame 32, and is attached to the indoor-outdoor direction extending portion 323. Thereby, since the spacer member 8 can be pre-attached to the attachment lower frame 32 before being attached to the newly installed lower frame 22, the workability when assembling the retrofit fitting 1 is improved. The groove portion 323a of the present embodiment is formed by a tapping hole extending along the longitudinal direction of the attachment lower frame 32.

[0083] When the attachment lower frame 32 is attached to the outer peripheral surface side of the newly installed lower frame 22, as shown in FIG. 18, the inclined surface 227 of the newly installed lower frame 22 abuts against and is placed on the upper surface 81 of the spacer member 8 of the attachment lower frame 32. At this time, the load F2 directed toward the spacer member 8 is directed toward the indoor side X2 due to the contact between the inclined surface 227 of the newly installed lower frame 22 and the upper surface 81 of the spacer member 8. Therefore, the attachment lower frame 32 can receive the load of the newly installed frame 2 as much as possible on the indoor side X2.

[0084] As shown in FIG. 2, when a fixing screw 32b passing through the indoor-side upward extension plate 327 of the attachment lower frame 32 is screwed from the indoor side X2 toward the outdoor side X1 into the indoor-side downward extension plate 226 of the newly installed lower frame 22, a force F2 acting from the indoor side X2 toward the outdoor side X1 is applied to the newly installed lower frame 22 as shown in FIG. 18, and the newly installed lower frame 22 tends to move to the outdoor side X1. At this time, since the inclined surface 227 of the newly installed lower frame 22 and the upper surface 81 of the spacer member 8 are inclined upward from the indoor side X2 toward the outdoor side X1, it is possible to effectively prevent the newly installed lower frame 22 from moving to the outdoor side X1.

[0085] As shown in FIGS. 2 and 18, the spacer member 8 is disposed above the reinforcing member 7. According to this, the load F1 applied to the attachment lower frame 32 via the spacer member 8 can be stably supported by the reinforcing member 7 on the lower surface side of the attachment lower frame 32. Moreover, the reinforcing member 7 of the present embodiment is placed on the guide rail 622 of the existing lower frame 62, and the spacer member 8 is disposed directly above this guide rail 622. Therefore, the load F1 applied to the attachment lower frame 32 via the spacer member 8 can be more stably supported by the reinforcing member 7.

[0086] According to the retrofit fitting 1 according to this embodiment, the following effects can be achieved. That is, the retrofit fitting 1 is attached to the existing frame 6 provided at the opening of the building 100, and includes a newly installed frame 2 configured by assembling four sides, and an attachment frame 3 attached to the inner peripheral side of the existing frame 6 in a state where it is attached to the outer periphery of the newly installed frame 2 by assembling four sides. The newly installed frame 2 includes a newly installed upper frame 21, and the attachment frame 3 includes an attachment upper frame 31. The attachment upper frame 31 has a screw fixing portion 315 through which a fixing screw 31a passes when the attachment upper frame 31 is screwed to the newly installed upper frame 21, an L-shaped hook piece 316a that protrudes from the attachment upper frame 31 toward the newly installed upper frame 21 and hooks and supports the newly installed upper frame 21 from the outdoor side X1, and an outdoor-side lower contact piece 316b that protrudes from the attachment upper frame 31 toward the newly installed upper frame 21 and contacts the upper surface 21a of the newly installed upper frame 21 when screwed to the newly installed upper frame 21. According to this, the attachment upper frame 31 can be commonly used in both cases where the newly installed upper frame does not have a hook piece and where it has a hook piece, and the same attachment strength can be ensured for any type of newly installed upper frame.

[0087] In this embodiment, the outdoor-side lower contact piece 316b is integrally provided at the lower end of the L-shaped hook piece 316a. According to this, the structure of the attachment upper frame 31 can be simplified.

[0088] In this embodiment, the attachment upper frame 31 has an indoor-outdoor direction extending portion 313 that is a water reservoir portion whose bottom surface is disposed lower than the upper surface of the screw fixing portion 315 on the outdoor side X1 with respect to the screw fixing portion 315. According to this, even if water infiltrates onto the indoor-outdoor direction extending portion 313 from the outdoor side X1, the water stays on the indoor-outdoor direction extending portion 313 that is lower than the screw fixing portion 315 and does not infiltrate onto the screw fixing portion 315. Therefore, there is no risk of water leakage from the attachment upper frame 31 to the newly installed upper frame 21 side through the fixing screw 31a passing through the screw fixing portion 315, and the waterproof property of the attachment upper frame 31 is improved.

[0089] As described above, a preferred embodiment of the present disclosure has been explained. However, the present disclosure is not limited to the above-described embodiment and can be appropriately modified. For example, in the attachment frame 3, the resin bridge material is provided only on the attachment upper frame 31 and the attachment lower frame 32, but it may be similarly provided on the pair of attachment vertical frames 33.

[0090] In the above embodiment, the case where the retrofit fitting 1 is applied to a sliding window type retrofit sash has been described, but it is not limited thereto. The retrofit fitting may be applied to, for example, an opening and closing type retrofit fitting in which the door body rotates about a rotation axis to open and close, or a vertically sliding type retrofit fitting. Further, the retrofit fitting may be applied to, for example, a FIX type retrofit fitting that is fixedly attached without opening and closing with respect to the frame.

Explanation of Reference Numerals

[0091] 1 Retrofit fitting, 2 Newly installed frame, 3 Attachment frame, 6 Existing frame, 21 Newly installed upper frame 21, 31 Attachment upper frame, 31a Fixing screw, 313 Portion extending in the indoor-outdoor direction (water reservoir portion), 315 Screw fixing portion, 316a L-shaped hook piece, 316b Contact piece, 100 Building

Claims

1. A retrofit fitting to be attached to an existing frame provided at an opening of a building, comprising: a newly installed frame formed by assembling four sides; and an attachment frame attached to the inner peripheral side of the existing frame in a state where the four sides are assembled and attached to the outer periphery of the newly installed frame, the newly installed frame includes a newly installed upper frame, the attachment frame includes an attachment upper frame, the attachment upper frame has a screw fixing portion through which a screw passes when the attachment upper frame is screw-fixed to the newly installed upper frame, a hook piece protruding from the attachment upper frame toward the newly installed upper frame and hook-supporting the newly installed upper frame from the outdoor side, and a contact piece protruding from the attachment upper frame toward the newly installed upper frame and contacting the upper surface of the newly installed upper frame when the newly installed upper frame is screw-fixed, a retrofit fitting.

2. The retrofit fitting according to claim 1, wherein the contact piece is integrally provided at a lower end portion of the hook piece.

3. The retrofit fitting according to claim 1 or 2, wherein the attachment upper frame has a water collecting portion on the outdoor side of the screw fixing portion and having a bottom surface disposed lower than the upper surface of the screw fixing portion.

Images