Sash, remodeled sash, and sash remodeling method

Abstract

To provide a renovated sash for preventing rain water from entering to the indoor side through the upper face of a base material when the rain water enters from the outdoor side into a lower frame.SOLUTION: A renovated sash 1 includes an existing lower frame 210 remaining in an opening 2 of a building, a new lower frame 220 mounted covering an area on the inner periphery side of the existing lower frame 210, and a base material 230 provided between the existing lower frame 210 and the new lower frame 220 to form the mounting surface of the new lower frame 220, the base material 230 having an outdoor side upper face part 231A, an indoor side upper face part 231B whose height toward the side of an upper frame 100 is greater than that of the outdoor side upper face part 231A, and a connection part 234 connecting the outdoor side upper face part 231A and the indoor side upper face part 231B.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a retrofit sash for retrofitting an existing window in a building into a new window. [Background technology]

[0002] Conventionally, a covering method has been adopted as a method for renovating existing windows. In a renovated sash renovated using this covering method, a new frame is attached to the existing frame installed in the opening of a building so as to cover the inner periphery of the existing frame (see, for example, Patent Document 1).

[0003] In addition, there is also a known type of remodeled sash in which a new frame is attached to the inner periphery of an existing frame via a base material. The base material is attached so as to cover the inner periphery of the existing frame from indoors to outdoors, and its surface serves as the mounting surface for the new frame (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-94771 [Patent Document 2] Japanese Utility Model Application Publication No. 63-146085 Summary of the Invention [Problem to be solved by the invention]

[0005] In a renovated sash having a base material, if rainwater seeps into the sash frame from the outside, there is a risk that the rainwater will run down the top surface of the base material and seep inside the sash.

[0006] Therefore, an object of the present invention is to provide a remodeled sash that prevents rainwater from seeping into the lower frame from the outside by running down the top surface of the base material to the inside of the building. [Means for solving the problem]

[0007] (1) The renovated sash of the present invention is a renovated sash (e.g., renovated sash 1 described below) comprising an existing lower frame (e.g., existing lower frame 210 described below) remaining in an opening in a building (e.g., opening 2 described below), a new lower frame (e.g., new lower frame 220 described below) attached so as to cover the inner periphery of the existing lower frame, and a base material (e.g., lower frame base material 230 described below) provided between the existing lower frame and the new lower frame and forming the mounting surface of the new lower frame, wherein the base material has an outdoor upper surface portion (e.g., outdoor upper surface portion 231A described below), an indoor upper surface portion (e.g., indoor upper surface portion 231B described below) provided closer to the upper frame (e.g., upper frame 100 described below) than the outdoor upper surface portion, and a connecting portion (e.g., connecting portion 234 described below) connecting the outdoor upper surface portion and the indoor upper surface portion.

[0008] (2) In the remodeled sash described in (1), it is preferable that the connecting portion is an inclined surface that slopes downward from the indoor-side upper surface portion toward the outdoor-side upper surface portion.

[0009] (3) In the renovated sash described in (1) or (2), the newly installed lower frame is fixed to the base material by an attachment screw (e.g., attachment screw 225 described below) that penetrates the newly installed lower frame and the base material, and it is preferable that the attachment screw penetrates the outdoor-facing upper surface of the base material.

[0010] (4) In the remodeled sash described in any one of (1) to (3), the newly installed sill preferably abuts against the outdoor end of the indoor-side upper surface (for example, the outdoor end 231Ba described below). [Effects of the Invention]

[0011] According to the present invention, a remodeled sash can be provided in which, even if rainwater seeps into the sash frame from the outside, the rainwater will not flow down the top surface of the base material and seep inside the sash. [Brief explanation of the drawings]

[0012] [Figure 1]FIG. 1 is a front view of a retrofit sash according to one embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view of the remodeled sash shown in FIG. 1. [Figure 3] FIG. 2 is a cross-sectional view of the remodeled sash shown in FIG. 1. [Figure 4] 3 is an enlarged vertical cross-sectional view showing a main portion of the upper side of the remodeled sash shown in FIG. 2. FIG. [Figure 5] 3 is an enlarged vertical cross-sectional view showing a main part of the lower side of the remodeled sash shown in FIG. 2. FIG. [Figure 6] 3 is an enlarged cross-sectional view showing a main part on the left side of the remodeled sash shown in FIG. 2. FIG. [Figure 7] 3 is an enlarged cross-sectional view showing a main part on the right side of the remodeled sash shown in FIG. 2. FIG. [Figure 8] This is an oblique view showing the base material attached to the inner periphery of the existing frame of the renovated sash. [Figure 9] An oblique view of the upper frame base material. [Figure 10] A partial oblique view of the upper frame base material from the back side. [Figure 11] FIG. 10 is a front view of the mounting member as seen from the indoor side. [Figure 12] FIG. [Figure 13] An oblique view of the lower frame base material. [Figure 14] A diagram illustrating how a new lower frame is attached to an existing lower frame. [Figure 15] FIG. 2 is a cross-sectional view of the height adjustment mechanism as seen from the front. [Figure 16] FIG. 4 is a cross-sectional side view of the height adjustment mechanism. [Figure 17] This is an oblique view of the back side of the vertical frame base material viewed from the outdoors side. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a front view of a remodeled sash according to one embodiment of the present invention, Fig. 2 is a vertical cross-sectional view of the remodeled sash shown in Fig. 1, and Fig. 3 is a horizontal cross-sectional view of the remodeled sash shown in Fig. 1. Fig. 4 is a vertical cross-sectional view showing an enlarged view of the upper main part of the remodeled sash shown in Fig. 2, Fig. 5 is a vertical cross-sectional view showing an enlarged view of the lower main part of the remodeled sash shown in Fig. 2, Fig. 6 is a horizontal cross-sectional view showing an enlarged view of the left main part of the remodeled sash shown in Fig. 2, and Fig. 7 is a horizontal cross-sectional view showing an enlarged view of the right main part of the remodeled sash shown in Fig. 2. Fig. 8 is a perspective view showing a base material attached to the inner periphery of the existing frame of the remodeled sash.

[0014] As shown in Figure 1, the remodeled sash 1 of the present invention comprises a rectangular window frame 10 formed by an upper frame 100, a lower frame 200, and a pair of left and right vertical frames 300, 400, a shoji screen 20 that can be opened and closed within the window frame 10, and a screen door 30 that can be slidably fitted into the window frame 10 on the indoor side of the shoji screen 20. A frame member 3 is provided around the opening 2 so as to cover the inner periphery. Figure 1 shows the remodeled sash 1 as seen from the outdoor side.

[0015] 2 and 3, the shoji screen 20 shown in this embodiment is a sliding type shoji screen made of multiple panes of glass, with two panes of glass 22, 22 on the indoor and outdoor sides, and a spacer 23 sandwiched between these panes of glass 22, 22, all within a frame 21 that runs all around the screen, and has excellent thermal insulation properties. The shoji screen 20 is configured to rotate by operating a lever 24 attached to the indoor side, so that it opens toward the outdoor side and closes toward the indoor side.

[0016] The screen door 30 is housed in the groove 11 provided around the window frame 10. As shown in FIG. 3, the screen door 30 has a net part 31 that can be folded in the left-right direction, and in the state where the net part 31 is folded, it is housed on one vertical frame 300 side. When the vertical frame part 32 attached to the end of the net part 31 is slid toward the vertical frame 400 side, it is extended to the indoor side of the shoji 20, and when the vertical frame part 32 is slid toward the vertical frame 300 side, it is configured to be folded. FIG. 3 shows the state where the screen door 30 is folded to the vertical frame 300 side, and the state where the screen door 30 is extended is shown by a dashed line.

[0017] Next, the window frame 10 will be described. <A. Upper frame> First, the upper frame 100 will be described. As shown in FIGS. 2 and 4, the upper frame 100 is composed of an existing upper frame 110, a newly installed upper frame 120, and an upper frame base material 130.

[0018] a1. Existing upper frame The existing upper frame 110 is made of a metal frame body and is attached to the outdoor side of the upper side of the opening 2 of the building. The existing upper frame 110 has an outdoor side wall part 111 that extends downward at the outdoor side end. As shown in FIG. 4, the outdoor side wall part 111 is the base part of the existing side wall part 111a (shown by a dashed line in FIG. 4) that was originally provided on the existing upper frame 110 before being modified to the retrofit sash 1 and was left after the existing side wall part 111a was cut. The lower end of the outdoor side wall part 111 is located above the position of the inner peripheral surface 3a of the frame member 3.

[0019] Also, the existing upper frame 110 integrally has an angle part 112 that extends so as to project inward on the indoor side at the indoor side end. The angle part 112 is fixed to the outdoor side end of the inner peripheral surface 3a of the frame member 3.

[0020] The existing upper frame 110 further has a protruding piece 113. The protruding piece 113 protrudes from the outdoor end of the angle portion 112 toward the inside of the opening 2 (the lower side in Figures 2 and 4). This protruding piece 113 is a remnant of the protruding piece consisting of the base portion of the existing protruding piece 113a (shown by a dashed line in Figure 4) that was originally provided on the existing upper frame 110 before it was remodeled into the remodeled sash 1 and was left uncut when it was cut off. The protruding piece 113 protrudes further toward the inside of the opening 2 than the inner circumferential surface 3a of the frame member 3. In this embodiment, the protruding piece 113 protrudes inward (downward) by about 5 mm beyond the inner circumferential surface 3a of the frame member 3.

[0021] a2. New upper frame The new upper frame 120 is attached to the inner periphery of the existing upper frame 110, with an upper frame base material 130 sandwiched therebetween. The new upper frame 120 is primarily made of a metal frame body, and has a protruding portion 121 on the outdoor side that protrudes further outdoors than the shoji screen 20. The protruding portion 121 slopes slightly downward toward the outdoors, and has an outdoor side wall portion 122 that rises upward at its tip. The outdoor side wall portion 122 extends approximately parallel to and faces the outdoor side wall portion 111 of the existing upper frame 110, and is positioned so as to completely conceal the outdoor side wall portion 111 from the outdoors side.

[0022] The outdoor side wall 122 has multiple ribs 122a to 122c that protrude toward the indoor side. The rib 122a is located at the upper end of the outdoor side wall 122. The ribs 122b and 122c are located below the rib 122a and protrude so as to abut against the outdoor side wall 132 of the upper frame base material 130, which will be described later. These ribs 122a to 122c extend parallel to each other over the entire length of the new upper frame 120.

[0023] The new upper frame 120 has a resin angle member 123 at its indoor end that extends toward the indoor side. The angle member 123 is formed integrally with the groove 11 in which the screen door 30 is placed, and is positioned at a distance from the inner peripheral surface 3a of the frame member 3. A resin angle cover 124 is attached between this angle member 123 and the inner peripheral surface 3a of the frame member 3. The boundary between the angle cover 124 and the inner peripheral surface 3a of the frame member 3 is shielded by an L-shaped resin parting material 125. The parting material 125 is fixed to the inner peripheral surface 3a of the frame member 3 with mounting screws 125a.

[0024] The new upper frame 120 is fixed to the upper frame base material 130 via a spacer member 140 by a plurality of mounting screws 126a, 126b that penetrate the upper frame base material 130. The mounting screws 126a, 126b penetrate from the new upper frame 120 through the upper frame base material 130.

[0025] a3. Upper frame base material The upper frame base material 130 is disposed between the existing upper frame 110 and the new upper frame 120. As shown in Fig. 8, only one upper frame base material 130 is attached to the inner periphery of the existing upper frame 110, and extends over substantially the entire length of the existing upper frame 110. The upper frame base material 130 is formed to be the same length as the entire length of the new upper frame 120 or longer than the entire length of the new upper frame 120.

[0026] Details of the upper frame base material 130 are shown in Fig. 9. Fig. 9 is a perspective view of the upper frame base material 130. The upper frame base material 130 is made of metal, and integrally includes a base material main body 131, an outdoor side wall portion 132, and a plurality of protrusions 133a to 133d.

[0027] The base material body 131 is made of a long plate-like member that extends along the length of the existing upper frame 110, and covers the inner periphery of the existing upper frame 110 over almost the entire length in the length direction and in the indoor / outdoor directions, thereby forming a substantially flat mounting surface for the new upper frame 120. The indoor end of the base material body 131 is placed on the inner periphery surface 3a of the frame member 3 so as to cover the angle portion 112 of the existing upper frame 110.

[0028] The outdoor side wall portion 132 extends upward from the outdoor end portion of the base material main body 131. The outdoor side wall portion 132 extends approximately parallel to the outdoor side wall portion 111 of the existing upper frame 110, and is arranged between the outdoor side wall portion 122 of the new upper frame 120 and the outdoor side wall portion 111 of the existing upper frame 110 so as to cover approximately the lower half of the outdoor side wall portion 111 of the existing upper frame 110. The outdoor side wall portion 132 is arranged so as to abut against ribs 122b, 122c provided on the outdoor side wall portion 122 of the new upper frame 120, but the upper end portion 132a of the outdoor side wall portion 132 is arranged below the rib 122a.

[0029] The protrusions 133a to 133d are provided on the back surface (surface facing the existing upper frame 110) of the base material main body 131 so as to protrude and extend along the length direction of the base material main body 131. As shown in FIG. 4, the two indoor-side protrusions 133a and 133b of the protrusions 133a to 133d are arranged facing the inner peripheral surface 3a of the frame member 3. The indoor-side end of the base material main body 131 is fixed to the angle portion 112 of the existing upper frame 110 by a mounting screw 134 threaded between the protrusions 133a and 133b. At this time, the two protrusions 133a and 133b can maintain a constant distance between the inner peripheral surface 3a of the frame member 3 and the base material main body 131.

[0030] The indoor-most protrusion 133a is located at the indoor-most end of the base material main body 131. The indoor-side side of this protrusion 133a forms the indoor side surface 130a of the upper frame base material 130. As shown in FIG. 4, this indoor side surface 130a is located on the same plane as the indoor side surface 120a of the new upper frame 120 excluding the angle cover 124. The angle cover 124 is attached across the indoor side surface 130a of the upper frame base material 130 and the indoor side surface 120a of the new upper frame 120, covering these indoor side surfaces 120a, 130a.

[0031] Furthermore, when rainwater seeps in between the outdoor side wall 111 of the existing upper frame 110 and the outdoor side wall 132 of the upper frame base material 130, the protrusions 133a to 133d also have the function of blocking the rainwater and preventing it from further seeping indoors. In particular, the outdoor-most protrusion 133d functions as a first dam that first blocks rainwater seeping in from the outdoor side.

[0032] a4. Upper frame base material mounting structure As shown in Fig. 4, the outdoor side of the upper frame base material 130 is fixed to the outdoor side wall portion 111 of the existing upper frame 110 by an attachment member 40. Details of this attachment member 40 will be further explained with reference to Figs. 10 to 12. Fig. 10 is a partial perspective view of the upper frame base material 130 seen from the back side, Fig. 11 is a front view of the attachment member 40 seen from the indoor side, and Fig. 12 is a vertical cross-sectional view of the attachment member 40. Note that in Fig. 10, the existing upper frame 110 has been omitted from illustration to make it easier to understand the configuration.

[0033] The mounting member 40 comprises a base 41 attached to the back surface of the base material main body 131, a mounting piece 42 attached to the outdoor side wall portion 111 of the existing upper frame 110, and a height adjustment screw 43 consisting of a flat head screw rotatably held on the base 41. One or more mounting members 40 are provided depending on the length of the upper frame base material 130.

[0034] The base 41 is made of a flat metal plate, and a pair of support plate portions 41a, 41a are erected on the surface (the surface facing the existing upper frame 110). The support plate portions 41a, 41a are arranged parallel to each other in the indoor-outdoor direction, and are erected at a predetermined interval in the longitudinal direction of the upper frame base material 130. The interval between the pair of support plate portions 41a, 41a is set to be approximately the same as the length of the mounting piece 42 (the length along the longitudinal direction of the upper frame base material 130), which will be described later.

[0035] As shown in Fig. 9, the base material main body 131 is formed with a plurality of elongated holes 136 for inserting screws that extend along the indoor / outdoor direction. The elongated holes 136 are positioned closer to the outdoors than the protrusion 133d that is closest to the outdoors. Fig. 9 shows the upper frame base material 130 to which two mounting members 40 are attached, with two elongated holes 136 provided for each set of mounting members 40. The base 41 is fixed to the base material main body 131 with mounting screws 44 that pass through these elongated holes 136. Because the elongated holes 136 are long in the indoor / outdoor direction, the fixed position of the base 41 in the indoor / outdoor direction can be fine-tuned.

[0036] The mounting piece 42 is made of a metal plate that extends approximately parallel to the base material main body 131. A pair of clamping pieces 42a, 42a is erected on the upper surface of the mounting piece 42 (the surface facing the existing upper frame 110). The clamping pieces 42a, 42a extend along the length direction of the upper frame base material 130. As shown in FIG. 12 , the clamping pieces 42a, 42a are accommodated from below the outdoor side wall portion 111 of the existing upper frame 110, sandwiching the outdoor side wall portion 111 therebetween. The mounting piece 42 extends from below the outdoor side wall portion 111 sandwiched between the clamping pieces 42a, 42a so as to protrude toward the indoor side, and is positioned so as to be sandwiched between a pair of support plate portions 41a, 41a on the base 41.

[0037] With the outdoor side wall 111 sandwiched between the pair of clamping pieces 42a, 42a, a mounting screw 45 is screwed through the mounting piece 42 from below. The distance between the clamping pieces 42a, 42a is set slightly narrower than the sum of the thickness of the outdoor side wall 111 and the outer diameter of the threaded portion of the mounting screw 45. Therefore, the outdoor side wall 111 between the clamping pieces 42a, 42a is clamped between one of the clamping pieces 42a (the outdoor-side clamping piece 42a in this embodiment) and the mounting screw 45. In this way, the mounting piece 42 is fixed to the outdoor side wall 111.

[0038] 12, double-sided tape 46 is interposed between the outdoor-side clamping piece 42a and the outdoor side wall portion 111, bonding the clamping piece 42a to the outdoor side wall portion 111. The double-sided tape 46 limits the relative movement between the clamping piece 42a and the outdoor side wall portion 111, and prevents the mounting piece 42 from sliding sideways in conjunction with the rotation of the mounting screw 45. This improves the ease of work when fixing the mounting piece 42 to the outdoor side wall portion 111.

[0039] The height adjustment screw 43 fixes the mounting piece 42 to the base 41 so that the height can be adjusted. Specifically, a pair of holding claws 41b, 41b for holding the head 43a of the height adjustment screw 43 is provided on the surface of the base 41 between the pair of support plate portions 41a, 41a. The holding claws 41b, 41b rotatably hold the head 43a of the height adjustment screw 43. With the head 43a rotatably held by the holding claws 41b, 41b, the height adjustment screw 43 fixes the mounting piece 42 to the base 41 by screwing into the mounting piece 42 on the indoor side of the pair of clamping pieces 42a, 42a. This fixes the outdoor end of the upper frame base material 130 to the existing upper frame 110.

[0040] Between the holding claws 41b, 41b, an operation hole 41c having a diameter smaller than the outer diameter of the head 43a of the height adjustment screw 43 is formed. The upper surface (the surface having the screwdriver groove) of the head 43a of the height adjustment screw 43 faces into the operation hole 41c. Also, as shown in FIGS. 9 to 11, the base material main body 131 of the upper frame base material 130 has a hole portion 137 between adjacent elongated holes 136, which is larger than the operation hole 41c. The operation hole 41c is disposed within the hole portion 137 of this base material main body 131. Therefore, the head 43a of the height adjustment screw 43 facing into the operation hole 41c can be rotated using a screwdriver or the like from the lower side of the base material main body 131 through the hole portion 137.

[0041] The mounting piece 42 that threads onto the height adjustment screw 43 cannot rotate because it is sandwiched between the pair of support plate portions 41a, 41a, so when the height adjustment screw 43 rotates, the mounting piece 42 moves up and down between the support plate portions 41a, 41a along the axial direction of the height adjustment screw 43. This makes it possible to adjust the height of the outdoor side of the upper frame base material 130, and makes it easy to fine-tune the levelness of the upper frame base material 130.

[0042] 4, the upper frame base material 130 is attached to the inner periphery of the existing upper frame 110, with a predetermined space S1 between the base material main body 131 and the inner periphery 110a of the existing upper frame 110 and the inner periphery 3a of the frame member 3. This space S1 is defined by two protrusions 133a, 133b of the upper frame base material 130 and the height-adjustable mounting member 40. In this embodiment, the distance between the base material main body 131 of the upper frame base material 130 and the inner periphery 3a of the frame member 3 is set to be the same as or slightly larger than the protrusion height (approximately 5 mm) of the protrusion piece 113 of the existing upper frame 110. As a result, the protrusion piece 113 of the existing upper frame 110 is completely contained within the space S1 and does not interfere with the upper frame base material 130, making it easy to attach the upper frame base material 130 to the inner periphery of the existing upper frame 110.

[0043] Furthermore, in the upper frame base material 130 shown in this embodiment, the two protrusions 133a, 133b arranged on the indoor side can maintain a constant distance between the inner surface 3a of the frame member 3 and the base material main body 131, so even if the upper frame base material 130 is pushed by the newly installed upper frame 120 and moves toward the existing upper frame 110, the base material main body 131 is prevented from coming too close to the existing upper frame 110, and a space S1 in which the protrusion piece 113 is accommodated can be secured.

[0044] When constructing the upper frame 100 of the remodeled sash 1, first, the existing side wall portion 111a and existing protruding piece 113a that protrude toward the inner periphery of the existing upper frame 110 are cut off. At this time, since it is difficult to cut the existing protruding piece 113a flush with the inner periphery 3a of the frame member 3, it is cut so that it protrudes further into the opening 2 than the inner periphery 3a of the frame member 3. This forms the protruding piece (remaining protruding piece) 113 that remains on the existing upper frame 110. Next, the upper frame base material 130 is attached to the inner periphery of the existing upper frame 110 so as to provide a space S1 between the existing upper frame 110 and the inner periphery 3a of the frame member 3, and the protruding piece 113 is housed in the space S1. This makes it possible to easily attach the upper frame base material 130 to the inner periphery of the existing upper frame 110 even if the protruding piece 113 protrudes beyond the inner periphery 3a of the frame member 3 on the existing upper frame 110.

[0045] a5.Watertight structure of the upper frame 4, a waterproof tape 150 is interposed between the two protruding portions 133a, 133b on the indoor side of the upper frame base material 130 and the inner peripheral surface 3a of the frame member 3 (the surface of the angle portion 112 of the existing upper frame 110). The waterproof tape 150 covers the protruding pieces 113 of the existing upper frame 110 and is also attached to the vicinity of the trim material 125 of the new upper frame 120.

[0046] Furthermore, a waterproof tape 151 is attached to the indoor side surface 120a of the new upper frame 120 and the indoor side surface 130a of the upper frame base material 130. The waterproof tape 151 extends from the indoor side surface 130a of the upper frame base material 130 to the portion of the waterproof tape 150 attached to the inner peripheral surface 3a of the frame member 3. In this embodiment, the indoor side surface 130a of the upper frame base material 130 and the indoor side surface 120a of the new upper frame 120 are arranged on the same plane. This allows the waterproof tape 151 to be applied flatly, improving application workability and adhesion, and improving waterproofing performance. In this embodiment, the indoor side surface 140a of the spacer member 140 is also arranged on the same plane as the indoor sides 120a and 130a, but the position of the indoor side surface 140a of the spacer member 140 is not particularly limited.

[0047] Furthermore, as shown in FIGS. 4 and 10, a plurality of waterstops 160 to 162 made of foamed rubber or the like are interposed between the existing upper frame 110 and the new upper frame 120. These waterstops 160 to 162 extend longitudinally along the length direction of the new upper frame 120.

[0048] The waterstop 160 is sandwiched between the outdoor side wall portion 111 of the existing upper frame 110 and the outdoor side wall portion 122 of the new upper frame 120, and abuts on the upper end portion 132a of the outdoor side wall portion 132 of the upper frame base material 130. Also, the waterstop 161 is sandwiched between the outdoor side wall portion 122 of the new upper frame 120 and the outdoor side wall portion 132 of the upper frame base material 130. Further, the waterstop 162 is disposed on the indoor side of the long hole 136 and the hole portion 137 formed in the base material main body 131 and on the outdoor side of the mounting screw 126b, and is sandwiched between the new upper frame 120 and the base material main body 131.

[0049] <B. Lower Frame> Next, the lower frame 200 will be described. As shown in FIGS. 2 and 5, the lower frame 200 includes an existing lower frame 210, a new lower frame 220, and a lower frame base material 230.

[0050] b1. Existing lower frame The existing lower frame 210 is attached to the outdoor side of the lower side portion of the opening 2 of the building. The existing lower frame 210 has a standing wall portion 211 that stands upright from a prospective wall portion 210a toward the new lower frame 220 disposed above. The standing wall portion 211 is continuously arranged along the length direction of the existing lower frame 210. The prospective wall portion 210a is slightly inclined downward toward the outdoor side, and the standing wall portion 211 is disposed at the outdoor side end portion of the prospective wall portion 210a. The standing wall portion 211 shown in the present embodiment is provided so as to protrude at approximately the same height as the inner peripheral surface 3a of the frame member 3, but is not limited thereto.

[0051] The existing lower frame 210 has a protruding portion 212 that protrudes from the lower part of the standing wall portion 211 toward the outdoor side, sloping slightly downward from the vertical wall portion 211. The protruding portion 212 protrudes toward the outdoor side from the vertical wall portion 211 at a position lower than the connection portion 210b between the vertical wall portion 211 and the recessed wall portion 210a. The outdoor end of the protruding portion 212 has an outdoor side wall portion 213 that extends downward. The existing lower frame 210 also has an angle portion 214 integral with the indoor end that protrudes toward the indoor side. The angle portion 214 is fixed to the outdoor end of the inner circumferential surface 3a of the frame member 3.

[0052] b2. New lower frame The new lower frame 220 is attached to the inner periphery of the existing lower frame 210, with a lower frame base material 230 sandwiched therebetween. The new lower frame 220 is mainly made of a metal frame body, and has an outdoor side wall 221 extending downward at its outdoor end. The outdoor side wall 221 extends approximately parallel to the outdoor side wall 213 of the existing lower frame 210, and is positioned so as to completely cover and conceal the outdoor side wall 213.

[0053] The new sill 220 has a resin angle member 222 at its indoor end that extends toward the indoor side. The angle member 222 is formed integrally with the groove 11 in which the screen door 30 is placed, and is positioned at a distance from the inner peripheral surface 3a of the frame member 3. A resin angle cover 223 is attached between this angle member 222 and the inner peripheral surface 3a of the frame member 3. The boundary between the angle cover 223 and the inner peripheral surface 3a of the frame member 3 is shielded by an L-shaped resin parting material 224. The parting material 224 is fixed to the inner peripheral surface 3a of the frame member 3 with mounting screws 224a.

[0054] The new lower frame 220 is fixed by mounting screws 225 that penetrate the lower frame base material 230. These mounting screws 225 penetrate the lower frame base material 230 but do not penetrate the existing lower frame 210. The mounting screws 225 are positioned on the indoor side of the vertical wall portion 211 of the existing lower frame 210.

[0055] b3. Lower frame base material The lower frame base material 230 is disposed between the existing lower frame 210 and the new lower frame 220. As shown in Figure 8, a plurality of lower frame base materials 230 are provided at intervals along the length direction of the existing lower frame 210.

[0056] Details of the lower frame base material 230 are shown in Fig. 13. Fig. 13 is a perspective view of the lower frame base material 230. The lower frame base material 230 is made of metal, and integrally includes a base material main body 231, an outdoor side wall portion 232, a protruding step portion 233, a connecting portion 234, and a plurality of protruding portions 235a to 235c.

[0057] The base material body 231 is made of a plate-like member that is sufficiently short compared to the longitudinal length of the existing lower frame 210, and by covering the inner periphery of the existing lower frame 210 in the indoor-outdoor direction, it forms a substantially flat mounting surface for the new lower frame 220. The indoor end of the base material body 231 is arranged on the inner periphery 3a of the frame member 3 so as to cover the angle portion 214 of the existing lower frame 210.

[0058] The outdoor side wall portion 232 extends downward from the outdoor end portion of the base material main body 231. The outdoor side wall portion 232 extends approximately parallel to the outdoor side wall portion 213 of the existing lower frame 210, and is disposed between the outdoor side wall portion 221 of the new lower frame 220 and the outdoor side wall portion 213 of the existing lower frame 210, with a length approximately the same as that of the outdoor side wall portion 221 of the new lower frame 220.

[0059] The protruding step portion 233 is positioned at the connection portion between the base material main body 231 and the outdoor side wall portion 232, and is integrally formed from the base material main body 231 to the outdoor side wall portion 232 so as to be partially bent and protrude toward the outdoors beyond the outdoor side wall portion 232.

[0060] As shown in Fig. 5, the outdoor side wall 221 of the new lower frame 220 abuts against the protruding step 233 from the outdoor side. Therefore, the outdoor side wall 221 of the new lower frame 220 is located further outdoors than the outdoor side wall 232 of the lower frame base member 230 by the amount of protrusion of the protruding step 233. This protrusion of the protruding step 233 toward the outdoor side corresponds to the amount by which the outdoor side wall 122 of the new upper frame 120 is positioned to protrude outdoors due to the presence of the ribs 122b, 122c provided on the outdoor side wall 122 of the new upper frame 120, the outdoor side wall 132 of the upper frame base member 130, and the clamping piece 42a of the mounting piece 42 of the mounting member 40, as shown in Fig. 4. Therefore, by abutting the outdoor side wall portion 221 of the new lower frame 220 against the protruding step portion 233, the outdoor side wall portion 122 of the new upper frame 120 and the outdoor side wall portion 221 of the new lower frame 220 can be aligned on the same plane.

[0061] The outdoor side wall 221 of the new sill 220 is aligned so as to be flush with the first outdoor side wall 321a, 421a of the new vertical frames 320, 420 (described later). As a result, the visible surface of the remodeled sash 1 (the surfaces of the outdoor side wall 122, 221, 321a, 421a) is aligned to be flush all around, improving the appearance of the remodeled sash 1 from the outdoor side.

[0062] The connecting portion 234 is a portion that connects the outdoor upper surface portion 231A, which is located on the outdoor side of the base material main body 231, with the indoor upper surface portion 231B, which is located on the indoor side, and is provided along the longitudinal direction of the base material main body 231 at a position on the indoor side of the mounting screws 225 of the newly installed lower frame 220.

[0063] The outdoor-side upper surface portion 231A and the indoor-side upper surface portion 231B form the upper surface of the lower frame base material 230. The outdoor-side upper surface portion 231A and the indoor-side upper surface portion 231B have different heights toward the upper frame 100, with the connecting portion 234 as the boundary. That is, the indoor-side upper surface portion 231B of the base material main body 231 is higher toward the upper frame 100 than the outdoor-side upper surface portion 231A, with the connecting portion 234 as the boundary, and the upper surface of the lower frame base material 230 has a stepped shape at the connecting portion 234. Therefore, even if rainwater seeps in between the new lower frame 220 and the lower frame base material 230 from the outdoor side, it will not seep indoors beyond the connecting portion 234. Therefore, with this lower frame base material 230, infiltrating rainwater can be blocked within the outdoor-side upper surface portion 231A of the base material main body 231, preventing rainwater from infiltrating into the indoor-side upper surface portion 231B.

[0064] The connecting portion 234 of this embodiment is configured with an inclined surface that slopes downward from the indoor-side upper surface portion 231B to the outdoor-side upper surface portion 231A. This has the effect of making it easy to attach the new lower frame 220 to the existing lower frame 210.

[0065] That is, when attaching a new frame to the inner periphery of an existing frame, first insert the new upper frame 120 from the outdoor side into the inner periphery of the existing upper frame 110 and butt it against it. Then, as shown in Figure 14, the new lower frame 220 is attached by retracting it from the outdoor side toward the inner periphery of the existing lower frame 210. During this process, the indoor-side vertical wall 228 and tapping holes 229 projecting downward from the new lower frame 220 abut against the upper surface of the lower frame base material 230, rubbing against it as it moves toward the indoor side. Therefore, if there is a step on the upper surface of the lower frame base material 230, it becomes difficult to retract the new lower frame 220 indoors. However, with this remodeled sash 1, because the connecting portion 234 of the lower frame base material 230 is an inclined surface, even if the vertical wall 228 and tapping holes 229 of the new lower frame 220 abut against it, it can be easily retracted toward the indoor side while being guided by the inclination of the connecting portion 234.

[0066] 5, the mounting screws 225 of the new lower frame 220 penetrate the outdoor-side upper surface 231A of the lower frame base material 230. Therefore, even if rainwater runs down the mounting screws 225 and seeps into the upper surface of the lower frame base material 230, it is blocked by the connecting parts 234 and does not seep into the indoor-side upper surface 231B.

[0067] 5 and 14, after being pulled onto the lower frame base material 230, the new lower frame 220 abuts against the indoor-side upper surface 231B of the lower frame base material 230. That is, the lower ends of the tapping holes 229 of the new lower frame 220 abut against the outdoor-side end 231Ba, which is located closest to the outdoors, of the indoor-side upper surface 231B. This makes it more difficult for water to be drawn indoors beyond the outdoor-side upper surface 231A, and this, combined with the rainwater blocking effect of the connecting portions 234, more effectively prevents rainwater that has infiltrated the upper surface of the lower frame base material 230 from seeping into the indoor side.

[0068] The protrusions 235a to 235c are provided on the back surface (surface on the existing lower frame 210 side) of the base material main body 231, protruding from the indoor side upper surface portion 231B, and extend parallel to the longitudinal direction of the base material main body 231. The protrusion height of the protrusions 235a to 235c is set to be slightly lower than the difference in height between the outdoor side upper surface portion 231A and the indoor side upper surface portion 231B of the base material main body 231, with the connecting portion 234 as the boundary.

[0069] 5, the protrusions 235a to 235c are disposed opposite the inner peripheral surface 3a of the frame member 3. The base material main body 231 is fixed to the angle portion 214 of the existing lower frame 210 by a mounting screw 236 between the protrusions 235b and 235c. At this time, the protrusions 235a to 235c can maintain a constant distance between the inner peripheral surface 3a of the frame member 3 and the base material main body 231.

[0070] The protrusion 235a closest to the interior is located at the indoor end of the base material main body 231. The indoor side of this protrusion 235a forms the indoor side surface 230a of the lower frame base material 230. As shown in Fig. 5, this indoor side surface 230a is located on the same plane as the indoor side surface 220a of the new lower frame 220 excluding the angle cover 223. The angle cover 223 is attached across the indoor side surface 230a of the lower frame base material 230 and the indoor side surface 220a of the new lower frame 220 so as to cover these indoor side surfaces 220a, 230a.

[0071] b4. Mounting structure of the lower frame base material 2 and 5, the outdoor side of the lower frame base material 230 is placed on the protruding portion 212 of the existing lower frame 210 via a height adjustment mechanism 50. Details of this height adjustment mechanism 50 will be further described with reference to Figures 15 and 16. Figure 15 is a cross-sectional view of the height adjustment mechanism 50 as seen from the front, and Figure 16 is a cross-sectional view of the height adjustment mechanism 50 as seen from the side.

[0072] The height adjustment mechanism 50 comprises a base 51 attached to the back surface of the base material main body 231, a height adjustment screw 52 consisting of a flat head screw rotatably held on the base 51, and a support leg 53 that threads onto the height adjustment screw 52.

[0073] The base 51 has a contact portion 51a that contacts the back surface of the base material main body 231, and a pair of side wall portions 51b, 51b that hang down from both ends of the contact portion 51a on the indoor and outdoor sides. The contact portion 51a and the side wall portions 51b, 51b extend along the length direction of the lower frame base material 230.

[0074] Height adjustment screw 52 is housed between side wall portions 51b, 51b. Specifically, holding steps 51c, 51c that conform to the cross-sectional shape of head 52a of height adjustment screw 52 are formed on the inner surfaces of side wall portions 51b, 51b, respectively. Head 52a of height adjustment screw 52 is inserted between abutment portion 51a and the pair of holding steps 51c, 51c from the side of base 51, and is thereby rotatably held between abutment portion 51a and the pair of holding steps 51c, 51c.

[0075] As shown in Fig. 13, two elongated holes 237 for inserting screws that extend along the indoor / outdoor direction are formed in the base material main body 231 of the lower frame base material 230. As shown in Fig. 15, the base 51 is fixed to the base material main body 231 by two mounting screws 54 that pass through the elongated holes 237. Because the elongated holes 237 are long in the indoor / outdoor direction, the fixed position of the base 51 in the indoor / outdoor direction can be fine-tuned.

[0076] The abutment portion 51a is formed with a through hole 51d having a diameter smaller than the outer diameter of the head 52a of the height adjustment screw 52. The upper surface (the surface having the driver groove) of the head 52a of the height adjustment screw 52 faces the inside of the through hole 51d. Also, as shown in FIGS. 13, 15, and 16, the base material main body 231 of the lower frame base material 230 has an elongated hole 238 formed similarly to the elongated hole 237 between adjacent elongated holes 237. The through hole 51d is arranged to face the inside of this elongated hole 238.

[0077] The support leg 53 has a threaded portion 53a that threads onto the height adjustment screw 52, ​​and a pair of L-shaped leg portions 53b, 53b that extend downward from the threaded portion 53a, sandwiching the height adjustment screw 52 therebetween. The legs 53b, 53b are placed on the protruding portion 212 of the existing lower frame 210. The thickness of the support leg 53 in the indoor / outdoor direction is approximately the same as the distance between the pair of side wall portions 51b, 52b of the base 51. Therefore, as shown in FIG. 16 , when the threaded portion 53a is threaded onto the height adjustment screw 52, ​​the support leg 53 is in surface contact with the pair of side wall portions 51b, 51b and is supported from the indoor / outdoor direction.

[0078] To adjust the height using the height adjustment mechanism 50, the head 52a of the height adjustment screw 52 facing the through-hole 51d is rotated with a screwdriver or the like through the elongated hole 238 from above the lower frame base material 230. Because the support leg 53 is sandwiched between the pair of side walls 51b and cannot rotate, when the head 52a of the height adjustment screw 52 is rotated, the support leg 53 moves up and down between the side walls 51b along the axial direction of the height adjustment screw 52. This adjusts the outdoor-side height of the lower frame base material 230, making it easy to fine-tune the level of the lower frame base material 230.

[0079] At this time, the support legs 53 of the height adjustment mechanism 50 come into contact with the downwardly sloping overhang 212, but there is no risk of tilting because they are supported by the pair of side walls 51b, 51b. Therefore, the height adjustment mechanism 50 can stably support the outdoor side of the lower frame base material 230 so that the height can be adjusted.

[0080] Furthermore, the pair of legs 53b, 53b of the support leg 53 are formed in an L shape and have a shape that protrudes to the left and right along the length direction of the lower frame base material 230 (the left and right direction in FIG. 15), thereby ensuring a large contact area with the protruding portion 212 of the existing lower frame 210. Therefore, the height adjustment mechanism 50 can stably withstand the load applied to the lower frame base material 230.

[0081] b5.Watertight structure of the lower frame 5, a waterproof tape 240 is interposed between the protruding portions 235a to 235c of the lower frame base material 230 and the inner peripheral surface 3a of the frame member 3 (the surface of the angle portion 214 of the existing lower frame 210). The waterproof tape 240 is attached between the protruding portions 235a to 235c and the inner peripheral surface 3a of the frame member 3, over the vicinity of the parting material 224 of the new lower frame 220.

[0082] Furthermore, a waterproof tape 241 is attached across the indoor side surface 220a of the new sill 220 and the indoor side surface 230a of the sill base material 230. The waterproof tape 241 extends from the indoor side surface 230a of the sill base material 230 to the portion of the waterproof tape 240 that is attached to the inner circumferential surface 3a of the frame member 3. In this embodiment, the indoor side surface 230a of the sill base material 230 and the indoor side surface 220a of the new sill 220 are arranged on the same plane. This allows the waterproof tape 241 to be attached flatly, which improves the ease of application and the adhesion state, thereby improving the waterproofing function.

[0083] b6. Drainage structure of the lower frame 5, a drainage hole 215 is provided in the lower part of the standing wall portion 211 of the existing lower frame 210, specifically, in the connection portion 210b between the standing wall portion 211 and the projection wall portion 210a. This drainage hole 215 is opened in the standing wall portion 211 prior to attaching the lower frame base material 230 and the new lower frame 220 to the existing lower frame 210.

[0084] In this remodeled sash 1, the mounting screws 225 that attach the new sill 220 penetrate the new sill 220, which is located indoors relative to the standing wall 211, and the outdoor-facing upper surface 213A of the sill base material 230. This raises the concern that rainwater may seep in from the new sill 220 along the mounting screws 225 and accumulate on the existing sill 210, which is located indoors relative to the standing wall 211, as shown by the arrows in Figure 5. However, with this remodeled sash 1, even if the standing wall 211 is located on the existing sill 210, which is located outdoor relative to the mounting screws 225, rainwater that seeps indoors relative to the standing wall 211 can be easily drained through the drainage holes 215 to the outdoor side of the standing wall 211. Because the concealed wall 210a is sloped downward toward the outdoor side, rainwater is quickly drained from the drainage holes 215. Rainwater drained onto the outdoor side of the vertical wall portion 211 flows down onto the protruding portion 212 of the existing lower frame 210, which is located below the drainage hole 215, and is drained outdoors between adjacent lower frame base materials 230 or between the outdoor side wall portion 213 of the existing lower frame 210 and the outdoor side wall portion 232 of the lower frame base material 230.

[0085] The drain holes 215 are provided one or a plurality along the length direction of the vertical wall portion 211. In particular, when the drain holes 215 are provided at one or both ends (on the side of the vertical frames 300 and 400) in the length direction of the vertical wall portion 211, drainage can be achieved from the end of the lower frame 200, which is preferable because it can make the drainage less conspicuous. The outdoor side of the vertical wall portion 211 is covered by the outdoor side wall portion 221 of the newly installed lower frame 220, so there is no risk of rainwater entering the drain holes 215 from the outdoor side.

[0086] As shown in FIG. 5, a predetermined space portion S3 is formed between the newly installed lower frame 220 and the base material main body 231 of the lower frame base material 230, specifically, between the newly installed lower frame 220 and the outdoor side upper surface portion 231A of the base material main body 231. As a result, the newly installed lower frame 220 and the outdoor side upper surface portion 231A of the base material main body 231 are separated without contact. For this reason, it is possible to avoid the phenomenon that rainwater infiltrating through the mounting screws 225 remains between the newly installed lower frame 220 and the outdoor side upper surface portion 231A of the base material main body 231 due to capillary action, and it can flow quickly to the existing lower frame 210 side from the long holes 237 or the like.

[0087] Also, as shown in FIG. 5, the newly installed lower frame 220 has a bottom wall portion 226 that slopes downward toward the outdoor side. The outdoor side wall portion 221 of the newly installed lower frame 220 is integrally formed at the outdoor side end of this bottom wall portion 226, and the mounting screws 225 of the newly installed lower frame 220 penetrate through this bottom wall portion 226. Above the bottom wall portion 226, there is an upper wall portion 227 in which the shoji 20 is stored so as to be openable and closable. The space between the bottom wall portion 226 and the upper wall portion 227 is sealed by a sealing member 228 mounted from the outdoor side. Therefore, the rainwater that infiltrates into the bottom wall portion 226 through the mounting screws 225 can be drained to the outside through the gap of the sealing member 228 along the inclined surface of the bottom wall portion 226.

[0088] <C. Vertical Frame> Next, the vertical frames 300 and 400 will be described. As shown in FIGS. 3, 6, and 7, the vertical frames 300 and 400 are composed of existing vertical frames 310 and 410, newly installed vertical frames 320 and 420, and vertical frame base materials 330 and 430.

[0089] c1. Existing vertical frame The existing vertical frames 310, 410 are attached to the left and right vertical sides of the outdoor side of the building opening 2. The existing vertical frames 310, 410 have outdoor side walls 311, 411 at their outdoor ends that extend outward on the left and right, and angle parts 312, 412 that extend integrally with their indoor ends so as to protrude toward the indoor side. The angle parts 312, 412 are fixed to the outdoor ends of the inner circumferential surface 3a of the frame member 3.

[0090] The existing vertical frames 310, 410 have multiple (three in this embodiment) protruding pieces 313, 413 that protrude toward the inside of the opening 2 (the center side in FIG. 3, the right side in FIG. 6, and the left side in FIG. 7). The protruding pieces 313, 413 extend parallel to the length of the existing vertical frames 310, 410.

[0091] The protruding pieces 313, 413 are remnants of the existing protruding pieces 313a, 413a (shown by dashed lines in Figures 6 and 7) that were originally provided on the existing vertical frames 310, 410 before they were remodeled into the remodeled sash 1, and consist of the base portions of the existing protruding pieces 313a, 413a that were left uncut when the existing protruding pieces 313a, 413a (shown by dashed lines in Figures 6 and 7) that were originally provided on the existing vertical frames 310, 410 before they were remodeled into the remodeled sash 1 were cut off. The protruding pieces 313, 413 are approximately the same height and protrude further inward into the opening 2 than the inner peripheral surface 3a of the frame member 3. In this embodiment, the protruding pieces 313, 413 protrude about 5 mm from the inner peripheral surface 3a of the frame member 3.

[0092] c2. New vertical frame The new vertical frames 320, 420 are attached to the inner periphery of the existing vertical frames 310, 410, with vertical frame base materials 330, 430 sandwiched therebetween. The new vertical frames 320, 420 are mainly made of a metal frame body, and have first outdoor side walls 321a, 421a integrally formed at the outdoor end and extending outward on the left and right, and further have second outdoor side walls 321b, 421b integrally formed at the end of the first outdoor side wall 321a, 421a and extending toward the indoor side.

[0093] The first outdoor side walls 321a, 421a extend approximately parallel to the outdoor side walls 311, 411 of the existing vertical frames 310, 410, and are arranged so as to entirely cover the outdoor side walls 311, 411. The second outdoor side walls 321b, 421b are arranged so as to cover the outdoor side walls 311, 411 of the existing vertical frames 310, 410 from the outside, left and right.

[0094] The new vertical frames 320, 420 have resin angle members 322, 422 at their indoor end that extend toward the indoor side. The angle members 322, 422 are formed integrally with the groove 11 in which the screen door 30 is placed, and are positioned at a distance from the inner surface 3a of the frame member 3. Resin angle covers 323, 423 are attached between the angle members 322, 422 and the inner surface 3a of the frame member 3. The boundary between the angle covers 323, 423 and the inner surface 3a of the frame member 3 is shielded by resin L-shaped parting members 324, 424. The parting members 324, 424 are fixed to the inner surface 3a of the frame member 3 with mounting screws 324a, 424a.

[0095] The new vertical frames 320, 420 are fixed to the vertical frame base materials 330, 430 with mounting screws 326a, 326b, 426a, 426b via spacer members 325, 425. The mounting screws 326a, 426a pass through the center of the vertical frame base materials 330, 430 and are screwed into the existing vertical frames 310, 410. The mounting screws 326b, 426b also pass through the bottom of the groove 11 and near the indoor-side end of the vertical frame base materials 330, 430.

[0096] c3. Vertical frame base material The vertical frame base materials 330, 430 are placed between the existing vertical frames 310, 410 and the new vertical frames 320, 420. As shown in Figure 8, a plurality of the vertical frame base materials 330, 430 are provided at intervals along the length direction of the existing vertical frames 310, 410. The vertical frame base materials 330 and 430 have the same configuration.

[0097] Details of the vertical frame base materials 330, 430 are shown in Figure 17. Figure 17 is a perspective view of the back side of the vertical frame base materials 330, 430 viewed from the outdoor side. The vertical frame base materials 330, 430 are made of metal, and integrally include base material main bodies 331, 431, outdoor side wall portions 332, 432, and protrusions 333, 433.

[0098] The base material main body 331, 431 is made of a plate-like member that is sufficiently short compared to the longitudinal length of the existing vertical frames 310, 410, and by covering the inner periphery of the existing vertical frames 310, 410 in both the indoor and outdoor directions, it forms an approximately flat mounting surface for the new vertical frames 320, 420.

[0099] 8, multiple vertical frame base materials 330, 430 are provided at intervals along the length of the existing vertical frames 310, 410. The indoor end of the base material main body 331, 431 is placed on the inner peripheral surface 3a of the frame member 3 so as to cover the angle portions 312, 412 of the existing vertical frames 310, 410.

[0100] 6 and 7, the outdoor side wall portions 332, 432 extend outward from the outdoor end portions of the base material main bodies 331, 431. The outdoor side wall portions 332, 432 extend approximately parallel to the outdoor side wall portions 311, 411 of the existing vertical frames 310, 410, and are disposed in contact with the outdoor side wall portions 311, 411 between the first outdoor side wall portions 321a, 421a of the new vertical frames 320, 420 and the outdoor side wall portions 311, 411 of the existing vertical frames 310, 410.

[0101] The protrusions 333, 433 are formed integrally with the indoor-side end of the base material main body 331, 431. The protrusions 333, 433 are arranged opposite the inner peripheral surface 3a of the frame member 3, and protrude from the back surface (the surface on the side of the existing vertical frames 310, 410) of the base material main body 331, 431 toward the inner peripheral surface 3a of the frame member 3. The protrusion height of the protrusions 333, 433 is set to be the same as or slightly greater than the height to which the protruding pieces 313, 413 remaining on the existing vertical frames 310, 410 protrude from the inner peripheral surface 3a of the frame member 3.

[0102] c4. Vertical frame base material mounting structure The vertical frame base materials 330, 430 are attached to the existing vertical frames 310, 410 by a pair of attachment stays 334, 434 on the back surface of the base material main body 331. Each attachment stay 334, 434 is formed in a strip shape extending along the length of the vertical frame base materials 330, 430, and is attached by attachment screws 337, 437 to elongated holes 335, 435, 336, 436 that are long in the indoor / outdoor direction and formed in the base material main body 331, 431. Because the attachment stays 334, 434 are attached using the elongated holes 335, 435, 336, 436, the attachment position of the attachment stays 334, 434 in the indoor / outdoor direction can be fine-tuned.

[0103] Each mounting stay 334, 434 has bent portions 334b, 434b that bend toward the existing vertical frames 310, 410 on both ends closer to the fixed portion with the mounting screws 337, 437. As a result, both end portions 334a, 434a of the mounting stays 334, 434 protrude toward the existing vertical frames 310, 410 further than the base material main bodies 331, 431. The mounting stays 334, 434 are fixed at both end portions 334a, 434a to the inner peripheral surfaces 310a, 410a of the existing vertical frames 310, 410 by mounting screws 338, 438, respectively, avoiding the protruding pieces 313, 413. As a result, the vertical frame base materials 330, 430 are attached to the inner peripheral sides of the existing vertical frames 310, 410.

[0104] Here, both end portions 334a, 434a of each mounting stay 334, 434 protrude further toward the existing vertical frames 310, 410 than the base material main body 331, 431, so the base material main body 331, 431 is positioned at a distance equal to the height of the bend caused by the bends 334b, 434b from the inner peripheral surfaces 310a, 410a of the existing vertical frames 310, 410. As a result, a space S2 is formed between the vertical frame base material 330, 430 and the inner peripheral surfaces 310a, 410a of the existing vertical frames 310, 410.

[0105] The height of the bend caused by the bent portions 334b, 434b of the mounting stays 334, 434 is set to be the same as or slightly higher than the protruding height (about 5 mm) of the protruding pieces 313, 413 of the existing vertical frames 310, 410. As a result, all of the protruding pieces 313, 413 of the existing vertical frames 310, 410 are housed within the space S2 and do not interfere with the vertical frame base materials 330, 430, making it possible to easily attach the vertical frame base materials 330, 430 to the inner periphery of the existing vertical frames 310, 410.

[0106] Furthermore, the indoor-side end of the vertical frame base material 330, 430 shown in this embodiment is provided with protrusions 333, 433 that protrude toward the inner peripheral surface 3a of the frame member 3, and these protrusions 333, 433 make it possible to maintain a constant distance between the inner peripheral surface 3a of the frame member 3 and the base material main body 331, 431. Therefore, even if the vertical frame base material 330, 430 moves toward the existing vertical frame 310, 410 due to bending of the mounting stays 334, 434 when the new vertical frame 320, 420 is attached to the vertical frame base material 330, 430, the base material main body 331, 431 is prevented from coming too close to the existing vertical frame 310, 410, and a space S2 in which the protrusion pieces 313, 413 are accommodated can be secured.

[0107] When constructing the vertical frames 300, 400 of the remodeled sash 1, first, the protruding pieces (existing protruding pieces) 313a, 413a protruding on the inner periphery of the existing vertical frames 310, 410 are cut so that they protrude further into the opening 2 than the inner periphery 3a of the frame member 3, forming protruding pieces (remaining protruding pieces) 313, 413 that are left uncut on the inner periphery 310a, 410a of the existing vertical frames 310, 410. Next, the vertical frame base materials 330, 430 are attached to the inner periphery of the existing vertical frames 310, 410 using mounting stays 334, 434 so as to provide a space S2 between them and the inner periphery 310a, 410a of the existing vertical frames 310, 410, and the protruding pieces 313, 413 are housed in the space S2. This makes it possible to easily attach the vertical frame base material 330, 430 to the inner periphery of the existing vertical frame 310, 410 even if the protruding pieces 313, 413 protrude from the existing vertical frame 310, 410.

[0108] The protrusions 333, 433 are located at the ends of the vertical frame base materials 330, 430 closest to the interior. The indoor-facing sides of these protrusions 333, 433 form the indoor side faces 330a, 430a of the vertical frame base materials 330, 430. As shown in Figures 6 and 7, these indoor side faces 330a, 430a are located on the same plane as the indoor side faces 320a, 420a of the newly-installed vertical frames 320, 420, excluding the angle covers 323, 423. The angle covers 323, 423 are attached across the indoor side faces 330a, 430a of the vertical frame base materials 330, 430 and the indoor side faces 320a, 420a of the newly-installed vertical frames 320, 420, covering these indoor side faces 320a, 330a, 420a, 430a.

[0109] c5.Waterproof structure of vertical frame 6 and 7, waterproof tapes 340, 440 are interposed between the protruding portions 333, 433 of the vertical frame base materials 330, 430 and the inner peripheral surface 3a of the frame member 3 (surfaces of the angle portions 312, 412 of the existing vertical frames 310, 410). The waterproof tapes 340, 440 are attached from the protruding pieces 313, 413 of the existing vertical frames 310, 410 to the vicinity of the parting materials 324, 424.

[0110] Furthermore, waterproof tapes 341, 441 are attached to the indoor side surfaces 320a, 420a of the newly installed vertical frames 320, 420 and the indoor side surfaces 330a, 430a of the vertical frame base materials 330, 430. The waterproof tapes 341, 441 extend from the indoor side surfaces 330a, 430a of the vertical frame base materials 330, 430 to the portions of the waterproof tapes 340, 440 that are attached to the inner peripheral surfaces 3a of the frame members 3. In this embodiment, the indoor side surfaces 330a, 430a of the vertical frame base materials 330, 430 and the indoor side surfaces 320a, 420a of the newly installed vertical frames 320, 420 are arranged on the same plane. This allows the waterproof tapes 341, 441 to be attached flatly, which improves the ease of application and the adherence state, thereby improving the waterproofing function. In this embodiment, the indoor sides 325a, 425a of the spacer members 325, 425 are also arranged on the same plane as the indoor sides 320a, 420a, 330a, 430a, but the positions of the indoor sides 325a, 425a of the spacer members 325, 425 are not particularly limited.

[0111] Furthermore, water-stopping materials 350, 450 made of foam rubber or the like are interposed between the existing vertical frames 310, 410 and the new vertical frames 320, 420. The water-stopping materials 350, 450 are sandwiched between the outdoor side wall portions 311, 411 of the existing vertical frames 310, 410 and the first outdoor side wall portions 321 a, 421 a of the new vertical frames 320, 420, and extend longitudinally along the length of the new vertical frames 320, 420.

[0112] The window frame 10 having the above configuration is framed in a rectangular shape by an upper frame 100, a lower frame 200, and left and right vertical frames 300, 400. As a result, the new frames of the renovated sash 1 (new upper frame 120, new lower frame 220, and new vertical frames 320, 420) are attached via the respective base materials 130, 230, 330, 430 so as to cover the inner periphery of the existing frames (existing upper frame 110, existing lower frame 210, and existing vertical frames 310, 410).

[0113] In this embodiment, the protruding pieces 113 remaining on the existing upper frame 110 and the protruding pieces 313, 413 remaining on the existing vertical frames 310, 410 are configured to be accommodated within the spaces S1, S2, respectively. However, if the remaining protruding pieces are similarly formed on the existing lower frame 210, a space can be similarly formed between the existing lower frame 210 and the lower frame base material 230, and the protruding pieces can be accommodated within that space. [Explanation of symbols]

[0114] 1 Renovated sash 2 Opening 100 upper frame 210 Existing lower frame 220 New Lower Frame 225 Mounting screw 230 Lower frame base material 231A Outdoor side top section 231B Indoor side top part 231Ba Outdoor end of the indoor upper surface 234 Connecting part

Claims

1. A new lower frame to be placed on the inner periphery of the existing lower frame to be placed in the opening of the building; A sash comprising a sash base material disposed between the existing sash and the new sash, The lower frame base material is made of metal and is fixed to a frame member arranged on the indoor side of the existing lower frame by mounting screws, A sash in which a first waterproof tape is attached across the indoor side of the lower frame base material and the frame member.

2. A second waterproof tape is provided under the lower frame base material, The second waterproof tape extends indoors beyond the lower frame base material and is attached to the frame member, The sash according to claim 1 , wherein the first waterproof tape extends over a portion of the second waterproof tape that is attached to the frame member.

3. A sash as described in claim 1 or 2, wherein the lower frame base material has multiple protrusions on the back surface.

4. A sash as described in Claim 3, wherein the multiple protrusions are arranged opposite the inner surface of the frame member.

5. A sash as described in claim 3 or 4, wherein the lower frame base material is fixed to the frame member between the multiple protrusions by the mounting screws.

6. An existing lower frame of an opening in a building; A new lower frame arranged on the inner periphery side of the existing lower frame; A renovated sash comprising a sash base material disposed between the existing sash and the new sash, The lower frame base material is made of metal and is fixed to a frame member arranged on the indoor side of the existing lower frame by mounting screws, A renovated sash in which a first waterproof tape is attached across the indoor side of the lower frame base material and the frame member.

7. A method for renovating a sash by attaching a new sash to the inner periphery of an existing sash of an opening in a building, comprising: A metal lower frame base material arranged on the inner periphery side of the existing lower frame is fixed to a frame member arranged on the indoor side of the existing lower frame with mounting screws; A sash renovating method comprising applying a first waterproof tape to the indoor side of the lower frame base material and the frame member.

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