Renovated sash

Abstract

To provide a renovated sash for allowing base materials to be screwed to fixed surfaces without being inclined.SOLUTION: A renovated sash 1 includes existing frames remaining in an opening 2 of a building, new frames mounted covering an area on the inner periphery side of the existing frames, and base materials 130, 230, 330, 430 arranged between the existing frames and the new frames. The ends on the indoor side of the base materials are mounted at clearances D from mounted faces, respectively. For example, at the ends on the indoor side of the base materials 130, 230, 330, 430, there are protruded leg parts 133a, 133b, 235a, 235b, 235c, 333, 433 protruded toward the mounted face so that the clearances D are formed between the front ends of the protruded leg parts and the mounted face.SELECTED DRAWING: Figure 13

Description

Technical Field

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

Background Art

[0002] Conventionally, as a method for retrofitting an existing window, a covering method has been adopted. In a retrofit sash retrofitted by this covering method, a new frame is attached so as to cover the inner peripheral side of an existing frame attached to an opening of a building (see, for example, Patent Document 1).

[0003] Also, as a retrofit sash, one provided with a base material serving as an attachment surface of a new frame between an existing frame and a new frame is known (see, for example, Patent Documents 2 and 3). The base material is attached so as to cover the inner peripheral side of the existing frame across the indoor / outdoor direction of the existing frame. At this time, the indoor-side end portion of the base material is screwed and fixed to the indoor side of the existing frame (for example, a frame member or an angle portion of the existing frame).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] When attaching the base material to the existing frame, in order to ensure watertightness between the base material and the existing frame, a sealing material may be provided between the indoor-side end of the base material and its mounting surface (the surface of the frame member or the angle part of the existing frame). In this case, when the base material is screwed, the indoor-side end of the base material protrudes toward the inner peripheral side by the thickness of the sealing material, and the base material may be attached to the existing frame at an inclination. Since the base material is a member that forms the mounting surface of the new frame, if the base material is inclined, it may affect the mounting of the new frame.

[0006] Therefore, an object of the present invention is to provide a retrofit sash that can be screwed to the mounting surface without tilting the base material.

Means for Solving the Problems

[0007] (1) The retrofit sash according to the present invention includes an existing frame (for example, the existing upper frame 110, existing lower frame 210, existing vertical frames 310, 410) remaining in an opening of a building (for example, the opening 2 described later), a new frame (for example, the new upper frame 120, new lower frame 220, new vertical frames 320, 420) attached so as to cover the inner peripheral side of the existing frame, and a base material (for example, the upper frame base material 130, lower frame base material 230, vertical frame base materials 330, 430) disposed between the existing frame and the new frame. The retrofit sash (for example, the retrofit sash 1 described later) is characterized in that the indoor-side end of the base material is attached with a gap (for example, the gap D described later) between it and the mounting surface (for example, the angle parts 112, 214, 312, 412, and the inner peripheral surface 3a of the frame member 3 described later).

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

Figure 19

Embodiments for Carrying Out the Invention

[0009] 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 modified sash according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the modified sash shown in FIG. 1, and FIG. 3 is a transverse sectional view of the modified sash shown in FIG. 1. FIG. 4 is a longitudinal sectional view showing an enlarged view of a main part on the upper side of the modified sash shown in FIG. 2, FIG. 5 is a longitudinal sectional view showing an enlarged view of a main part on the lower side of the modified sash shown in FIG. 2, FIG. 6 is a transverse sectional view showing an enlarged view of a main part on the left side of the modified sash shown in FIG. 2, and FIG. 7 is a transverse sectional view showing an enlarged view of a main part on the right side of the modified sash shown in FIG. 2. Further, FIG. 8 is a perspective view showing a state where a base material is attached to the inner peripheral side of an existing frame of the modified sash.

[0010] As shown in FIG. 1, a modified sash 1 according to the present invention is attached to the outdoor side of an opening 2 of a building, and includes a window frame 10 framed in a rectangular shape by an upper frame 100, a lower frame 200, and a pair of left and right vertical frames 300 and 400, a shoji 20 that is openably stored in the window frame 10, and a screen door 30 that is slidably stored in the window frame 10 on the indoor side of the shoji 20. On the inner peripheral side of the opening 2, a frame member 3 is provided over the four sides. FIG. 1 shows a state of the modified sash 1 viewed from the outdoor side.

[0011] As shown in FIGS. 2 and 3, the shoji 20 shown in this embodiment is a sliding type shoji composed of a plurality of glasses including two glasses 22 and 22 on the indoor side and the outdoor side and a spacer 23 sandwiched between these glasses 22 and 22 within a frame 21 extending over the four sides, and has excellent heat insulation properties. The shoji 20 is configured to rotate by operating a lever 24 attached to the indoor side, open toward the outdoor side, and close toward the indoor side.

[0012] The screen door 30 is housed in a groove portion 11 provided around the four sides of the window frame 10. As shown in FIG. 3, the screen door 30 has a net portion 31 that can be folded in the left-right direction, and in the state where the net portion 31 is folded, it is housed on one vertical frame 300 side. This screen door 30 is configured to be extended to the indoor side of the shoji 20 by sliding a vertical frame portion 32 attached to the end of the net portion 31 toward the vertical frame 400 side, and to be folded by sliding the vertical frame portion 32 toward the vertical frame 300 side. FIG. 3 shows the state where the screen door 30 is folded toward the vertical frame 300 side, and the state where the screen door 30 is extended is shown by a dashed line.

[0013] 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.

[0014] 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 portion of the opening 2 of the building. The existing upper frame 110 has an outdoor side wall portion 111 that extends downward at the outdoor side end. As shown in FIG. 4, the outdoor side wall portion 111 is the root portion of the existing side wall portion 111a (shown by a dashed line in FIG. 4) that was originally provided on the existing upper frame 110 before being modified to the modified sash 1 and was left after the existing side wall portion 111a was cut. The lower end portion of the outdoor side wall portion 111 is located above the position of the inner peripheral surface 3a of the frame member 3.

[0015] Also, the existing upper frame 110 integrally has an angle portion 112 that extends so as to project inward on the indoor side at the indoor side end. The angle portion 112 is fixed to the outdoor side end of the inner peripheral surface 3a of the frame member 3.

[0016] The existing upper frame 110 further has a protruding piece 113. The protruding piece 113 protrudes from the outdoor-side end of the angled part 112 toward the inside of the opening 2 (the lower side in FIGS. 2 and 4). This protruding piece 113 is a remaining part of the existing protruding piece 113a (shown by a broken line in FIG. 4) originally provided on the existing vertical frames 310 and 410 before being refitted to the refitted sash 1, which is the root part of the existing protruding piece 113a left when it was cut. The protruding piece 113 protrudes toward the inside of the opening 2 more than the inner peripheral surface 3a of the frame member 3. In the present embodiment, the protruding piece 113 protrudes about 5 mm (downward) more than the inner peripheral surface 3a of the frame member 3 toward the inside.

[0017] a2. Newly installed upper frame The newly installed upper frame 120 is attached to the inner peripheral side of the existing upper frame 110 with the upper frame base material 130 sandwiched therebetween. The newly installed upper frame 120 mainly consists of a metal frame body and has an overhanging part 121 that protrudes further outside than the shoji 20 on the outdoor side. The overhanging part 121 is slightly downwardly inclined toward the outdoor side and has an outdoor side wall part 122 that rises upward at its tip. The outdoor side wall part 122 extends substantially parallel so as to face the outdoor side wall part 111 of the existing upper frame 110 and is arranged to cover the entire outdoor side wall part 111 from the outdoor side.

[0018] The outdoor side wall part 122 has a plurality of ribs 122a to 122c that protrude toward the indoor side. The rib 122a is arranged at the upper end of the outdoor side wall part 122. The ribs 122b and 122c are arranged below the rib 122a and protrude so as to contact the outdoor side wall part 132 of the upper frame base material 130 described later. These ribs 122a to 122c extend in parallel over the entire length of the newly installed upper frame 120.

[0019] The newly installed upper frame 120 has a resin angle member 123 that extends toward the indoor side and protrudes toward the indoor side at the indoor-side end. The angle member 123 is integrally formed with the groove portion 11 in which the screen door 30 is stored and is arranged at an interval from the inner peripheral surface 3a of the frame member 3. A resin angle cover 124 is attached between the 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 a resin L-shaped partition member 125. The partition member 125 is fixed to the inner peripheral surface 3a of the frame member 3 by mounting screws 125a.

[0020] The newly installed upper frame 120 is fixed to the upper frame base material 130 by a plurality of mounting screws 126a and 126b that pass through the upper frame base material 130 via a spacer member 140 between the newly installed upper frame 120 and the upper frame base material 130. The mounting screws 126a and 126b pass through the upper frame base material 130 from the newly installed upper frame 120.

[0021] a3. Upper frame base material The upper frame base material 130 is arranged between the existing upper frame 110 and the newly installed upper frame 120. As shown in FIG. 8, only one upper frame base material 130 is attached to the inner peripheral side of the existing upper frame 110 and extends over substantially the entire length in the longitudinal direction of the existing upper frame 110. The upper frame base material 130 is formed to be the same as or longer than the entire length in the longitudinal direction of the newly installed upper frame 120.

[0022] 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 has a base material main body 131, an outdoor side wall portion 132, and a plurality of protruding leg portions 133a to 133d.

[0023] The base material body 131 is formed of a long plate-shaped member extending along the extending direction of the upper frame 100, and forms a substantially flat mounting surface for the new upper frame 120 by covering the inner peripheral side of the existing upper frame 110 over substantially the entire length in the longitudinal direction and also in the indoor-outdoor direction. The indoor-side end of the base material body 131 is disposed on the inner peripheral surface 3a of the frame member 3 so as to cover the angle portion 112 of the existing upper frame 110. In the present embodiment, the surface of the angle portion 112 of the existing upper frame 110 and the inner peripheral surface 3a of the frame member 3 are the mounting target surfaces for the indoor-side end of the upper frame base material 130.

[0024] The outdoor side wall portion 132 extends upward from the outdoor-side end of the base material body 131. The outdoor side wall portion 132 extends substantially parallel to the outdoor side wall portion 111 of the existing upper frame 110, and is disposed so as to cover substantially the lower half of the outdoor side wall portion 111 of the existing upper frame 110 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. The outdoor side wall portion 132 is disposed so as to abut against the 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 disposed below the rib 122a.

[0025] The protruding leg portions 133a to 133d protrude on the back surface (the surface on the side of the existing upper frame 110) of the base material body 131 parallel to each other along the length direction of the base material body 131 (the extending direction of the upper frame 100) toward the existing upper frame 110. As shown in FIG. 4, a pair of indoor protruding leg portions 133a, 133b among the protruding leg portions 133a to 133d are disposed to face the surface of the angle portion 112 of the existing upper frame 110, which is the mounting target surface, and the inner peripheral surface 3a of the frame member 3, and protrude toward this mounting target surface.

[0026] The innermost protruding leg portion 133a is disposed at the innermost end of the base material body 131. The inner side surface of this protruding leg portion 133a forms the inner side surface 130a of the upper frame base material 130. As shown in FIG. 4, this inner side surface 130a is disposed on the same plane as the inner side surface 120a excluding the angle cover 124 of the newly installed upper frame 120. The angle cover 124 is mounted so as to cover these inner side surfaces 120a, 130a across the inner side surface 130a of the upper frame base material 130 and the inner side surface 120a of the newly installed upper frame 120.

[0027] Further, when rainwater infiltrates between the outdoor side wall portion 111 of the existing upper frame 110 and the outdoor side wall portion 132 of the upper frame base material 130, the protruding leg portions 133a to 133d have a function of blocking the rainwater and preventing it from further infiltrating into the indoor side. In particular, the outermost protruding leg portion 133d functions as a first weir for first blocking the rainwater infiltrating from the outdoor side.

[0028] a4. Mounting structure of the upper frame base material 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 the attachment member 40. Details of this attachment member 40 will be further described with reference to FIGS. 10 to 12. FIG. 10 is a partial perspective view of the upper frame base material 130 viewed from the back side, FIG. 11 is a front view of the attachment member 40 viewed from the indoor side, and FIG. 12 is a longitudinal sectional view of the attachment member 40. In FIG. 10, the illustration of the existing upper frame 110 is omitted for easy understanding of the configuration.

[0029] The attachment member 40 includes a base portion 41 attached to the back surface of the base material body 131, an attachment piece 42 attached to the outdoor side wall portion 111 of the existing upper frame 110, and a height adjustment screw 43 including a dish screw rotatably held by the base portion 41. One or a plurality of these attachment members 40 are provided according to the length of the upper frame base material 130.

[0030] 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 on the side of the existing upper frame 110). Each of the support plate portions 41a, 41a is arranged in parallel along the indoor-outdoor direction and is erected at a predetermined interval in the length 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 length direction of the upper frame base material 130) described later.

[0031] As shown in FIG. 9, a plurality of long holes 136 for screw insertion extending along the indoor-outdoor direction are formed in the base material main body 131. The long holes 136 are arranged on the outdoor side of the outermost outdoor protruding leg portion 133d. FIG. 9 shows the upper frame base material 130 to which two mounting members 40 are attached, and two long holes 136 are provided for each set of mounting members 40. The base 41 is fixed to the base material main body 131 by mounting screws 44 passing through the long holes 136. Since the long holes 136 are long in the indoor-outdoor direction, the fixing position of the base 41 in the indoor-outdoor direction can be finely adjusted.

[0032] The mounting piece 42 is made of a metal plate extending substantially parallel to the base material main body 131. A pair of clamping pieces 42a, 42a are erected on the upper surface (the surface on the side of the existing upper frame 110) of the mounting piece 42. 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 house the outdoor side wall portion 111 of the existing upper frame 110 so as to sandwich the outdoor side wall portion 111 therebetween from below the outdoor side wall portion 111. The mounting piece 42 extends so as to protrude inward from below the outdoor side wall portion 111 sandwiched between the clamping pieces 42a, 42a and is arranged to be sandwiched between the pair of support plate portions 41a, 41a on the base 41.

[0033] Between a pair of clamping pieces 42a, 42a, with the outdoor side wall portion 111 being clamped therebetween, a mounting screw 45 that penetrates the mounting piece 42 from the lower side is screwed in. Here, the interval between the clamping pieces 42a, 42a is set to be slightly narrower than the dimension obtained by adding the thickness of the outdoor side wall portion 111 and the outer diameter of the thread portion of the mounting screw 45. Therefore, the outdoor side wall portion 111 between the clamping pieces 42a, 42a is clamped between one clamping piece 42a (the outdoor side clamping piece 42a in this embodiment) and the mounting screw 45. At this time, the thread of the mounting screw 45 bites into the outdoor side wall portion 111 and the clamping piece 42a respectively, so the mounting screw 45 will not easily fall off, and the mounting piece 42 can be firmly fixed to the outdoor side wall portion 111.

[0034] As shown in FIG. 12, an adhesive tape 46 is interposed between the outdoor side clamping piece 42a and the outdoor side wall portion 111, bonding the clamping piece 42a and the outdoor side wall portion 111. The double-sided tape 46 restricts the relative movement between the clamping piece 42a and the outdoor side wall portion 111, preventing the mounting piece 42 from sliding laterally in conjunction with the rotation of the mounting screw 45. Thereby, the workability when fixing the mounting piece 42 to the outdoor side wall portion 111 is improved.

[0035] The height adjustment screw 43 fixes the mounting piece 42 to the base 41 in a height-adjustable manner. Specifically, on the surface of the base 41 between a pair of support plate portions 41a, 41a, a pair of holding claw portions 41b, 41b for holding the head 43a of the height adjustment screw 43 are provided. The holding claw portions 41b, 41b rotatably hold the head 43a of the height adjustment screw 43. The height adjustment screw 43 is screwed into the mounting piece 42 on the indoor side of the pair of clamping pieces 42a, 42a with the head 43a rotatably held by the holding claw portions 41b, 41b, thereby fixing the mounting piece 42 to the base 41. Thereby, the outdoor side end portion of the upper frame base material 130 is fixed to the existing upper frame 110.

[0036] Between the holding claws 41b and 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 driver groove) of the head 43a of the height adjustment screw 43 faces the inside of 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 larger than the operation hole 41c between adjacent long holes 136. The operation hole 41c is disposed within the hole portion 137 of the base material main body 131. Therefore, the head 43a of the height adjustment screw 43 facing the inside of the operation hole 41c can be rotationally operated by a driver or the like through the hole portion 137 from the lower side of the base material main body 131.

[0037] The attachment piece 42 that is screwed with the height adjustment screw 43 is non-rotatable by being sandwiched between the pair of support plate portions 41a and 41a. Therefore, when the height adjustment screw 43 rotates, the attachment piece 42 moves in the vertical direction along the axial direction of the height adjustment screw 43 while being sandwiched between the support plate portions 41a and 41a. As a result, the height of the outdoor side of the upper frame base material 130 can be adjusted, and the levelness of the upper frame base material 130 can be easily finely adjusted.

[0038] Next, the indoor side of the upper frame base material 130 is fixed to the frame member 3 by attachment screws 134 that penetrate the base material main body 131 and the angle portion 112 of the existing upper frame 110. Among the plurality of protruding leg portions 133a to 133d erected on the base material main body 131, a pair of protruding leg portions 133a and 133b disposed on the indoor side face the surface of the angle portion 112 that is the attachment target surface and the inner peripheral surface 3a of the frame member 3. The attachment screw 134 is disposed between the pair of protruding leg portions 133a and 133b, penetrates the base material main body 131, and is screwed into the frame member 3.

[0039] Here, as shown in FIG. 13, the indoor-side end of the upper frame base member 130 has a gap D between the surface of the angle portion 112, which is the mounting target surface, and the inner peripheral surface 3a of the frame member 3, and is attached by the mounting screws 134. That is, in a state where the upper frame base member 130 is screwed to the mounting screws 134, a gap D is formed between the tips of the protruding legs 133a and 133b of the upper frame base member 130 and the surface of the angle portion 112 and the inner peripheral surface 3a of the frame member 3. This gap D is formed by setting the protruding height of the protruding legs 133a and 133b to a height of D1 - D2, where D1 is the designed distance between the base member body 131 of the upper frame base member 130 and the surface of the angle portion 112 and the inner peripheral surface 3a of the frame member 3, and D2 is the thickness of the waterproof tape 150 described later.

[0040] Thereby, even when the mounting screws 134 are screwed in with the waterproof tape 150 disposed between the upper frame base member 130, the angle portion 112, and the frame member 3, there is no risk that the indoor-side end of the upper frame base member 130 will protrude inward (the lower side in FIGS. 4 and 13) and tilt, and it becomes possible to form the mounting surface for the new upper frame 120 at an appropriate position.

[0041] Note that the upper frame base member 130 has a predetermined space S1 between the base member body 131 and the inner peripheral surface 3a of the frame member 3 as shown in FIG. 4, with the protruding legs 133a and 133b disposed to face the frame member 3, and is attached to the inner peripheral side of the existing upper frame 110. In the present embodiment, this space S1 is set such that the distance between the base member body 131 of the upper frame base member 130 and the inner peripheral surface 3a of the frame member 3 is the same as or slightly larger than the protruding height (about 5 mm) of the protruding piece 113 of the existing upper frame 110. Thereby, the protruding piece 113 of the existing upper frame 110 is completely accommodated within the space S1 and thus does not interfere with the upper frame base member 130.

[0042] a5. Water stop structure of the upper frame As shown in FIG. 4, a waterstop tape 150, which is a sealing material, is interposed between the two protruding leg portions 133a and 133b on the indoor side of the upper frame base material 130, the surface of the angle portion 112 of the existing upper frame 110, and the inner peripheral surface 3a of the frame member 3. The waterstop tape 150 covers the protruding piece 113 of the existing upper frame 110 and is adhered over the vicinity of the partition material 125 of the new upper frame 120. The mounting screw 134 for fixing the indoor side of the upper frame base material 130 penetrates through this waterstop tape 150. Therefore, the outer peripheral surface of the mounting screw 134 is waterproofed.

[0043] Also, a waterstop tape 151 is adhered across 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 waterstop tape 151 extends from the indoor side surface 130a of the upper frame base material 130 so as to overlap the portion where it is adhered to the inner peripheral surface 3a of the frame member 3 of the waterstop tape 150. In the present 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. Thereby, since the waterstop tape 151 can be adhered flatly, the adhesion workability is good, the adhesion state is also good, and the waterstop function can be improved. In the present embodiment, the indoor side surface 140a of the spacer member 140 is also arranged on the same plane as the indoor side surfaces 120a and 130a, but the position of the indoor side surface 140a of the spacer member 140 is not particularly limited.

[0044] Furthermore, as shown in FIGS. 4 and 10, a plurality of waterstop materials 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 waterstop materials 160 to 162 extend longitudinally along the length direction of the new upper frame 120.

[0045] The waterproof material 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 is in contact with the upper end portion 132a of the outdoor side wall portion 132 of the upper frame base material 130. Further, the waterproof material 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. Furthermore, the waterproof material 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.

[0046] <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.

[0047] 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 the 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 of the prospective wall portion 210a. The standing wall portion 211 shown in the present embodiment is provided so as to protrude to the same height as the inner peripheral surface 3a of the frame member 3, but is not limited thereto.

[0048] The existing lower frame 210 has an overhanging portion 212 that protrudes slightly downward from the lower part of the standing wall portion 211 toward the outdoor side on the outdoor side of the standing wall portion 211. The overhanging portion 212 protrudes toward the outdoor side from the standing wall portion 211 at a position below the connection portion 210b between the standing wall portion 211 and the prospective wall portion 210a. The outdoor side end of the overhanging portion 212 has an outdoor side wall portion 213 that extends downward. Further, the existing lower frame 210 integrally has an angle portion 214 that extends so as to protrude toward the indoor side at the indoor side end. The angle portion 214 is fixed to the outdoor side end of the inner peripheral surface 3a of the frame member 3.

[0049] b2. Newly installed lower frame The newly installed lower frame 220 is attached to the inner peripheral side of the existing lower frame 210 with the lower frame base material 230 sandwiched therebetween. The newly installed lower frame 220 mainly consists of a metal frame body and has an outdoor side wall portion 221 extending downward at the outdoor side end. The outdoor side wall portion 221 extends substantially parallel to the outdoor side wall portion 213 of the existing lower frame 210 and is arranged so as to cover the entire outdoor side wall portion 213 thereof.

[0050] The newly installed lower frame 220 has a resin angle member 222 extending so as to project inward at the indoor side end. The angle member 222 is integrally formed with the groove portion 11 in which the screen door 30 is stored and is arranged at a distance from the inner peripheral surface 3a of the frame member 3. A resin angle cover 223 is attached between the 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 a resin L-shaped partition member 224. The partition member 224 is fixed to the inner peripheral surface 3a of the frame member 3 by mounting screws 224a.

[0051] The newly installed lower frame 220 is fixed by mounting screws 225 passing through the lower frame base material 230. These mounting screws 225 pass through the lower frame base material 230 but do not pass through the existing lower frame 210. The mounting screws 225 are arranged on the indoor side of the vertical wall portion 211 of the existing lower frame 210.

[0052] b3. Lower frame base material The lower frame base material 230 is arranged between the existing lower frame 210 and the newly installed lower frame 220. As shown in FIG. 8, a plurality of lower frame base materials 230 are provided at intervals along the length direction of the existing lower frame 210.

[0053] Details of the lower frame base material 230 are shown in FIG. 14. FIG. 14 is a perspective view of the lower frame base material 230. The lower frame base material 230 is made of metal and integrally has 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 leg portions 235a to 235c.

[0054] The base material body 231 is composed of a plate-shaped member that is sufficiently short with respect to the length along the extending direction of the lower frame 200, and forms a substantially flat mounting surface for the new lower frame 220 by covering the inner peripheral side of the existing lower frame 210 across the indoor-outdoor direction. The indoor-side end of the base material body 231 is disposed on the inner peripheral surface 3a of the frame member 3 so as to cover the angled portion 214 of the existing lower frame 210. In the present embodiment, the surface of the angled portion 214 of the existing lower frame 210 and the inner peripheral surface 3a of the frame member 3 are the mounting target surfaces of the indoor-side end of the lower frame base material 230.

[0055] The outdoor side wall portion 232 extends downward from the outdoor-side end of the base material body 231. The outdoor side wall portion 232 extends substantially parallel to the outdoor side wall portion 213 of the existing lower frame 210, and is arranged at a length similar to that of the outdoor side wall portion 221 of the new lower frame 220 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.

[0056] The protruding step portion 233 is disposed at the connection portion between the base material body 231 and the outdoor side wall portion 232, and is integrally formed from the base material body 231 to the outdoor side wall portion 232 so as to partially bend and project outward from the outdoor side wall portion 232.

[0057] As shown in FIG. 5, the outdoor side wall portion 221 of the newly installed lower frame 220 is in contact with the protruding stepped portion 233 protruding from the outdoor side. Therefore, the outdoor side wall portion 221 of the newly installed lower frame 220 is located on the outdoor side by the amount of protrusion of the protruding stepped portion 233 more than the outdoor side wall portion 232 of the lower frame base material 230. As shown in FIG. 4, the amount of protrusion of this protruding stepped portion 233 to the outdoor side corresponds to the amount by which the outdoor side wall portion 122 of the newly installed upper frame 120 is arranged to protrude to the outdoor side due to the presence of the ribs 122b and 122c provided on the outdoor side wall portion 122 of the newly installed upper frame 120, the outdoor side wall portion 132 of the upper frame base material 130, and the sandwiching piece 42a of the attachment piece 42 in the attachment member 40. Therefore, by bringing the outdoor side wall portion 221 of the newly installed lower frame 220 into contact with the protruding stepped portion 233, the outdoor side wall portion 122 of the newly installed upper frame 120 and the outdoor side wall portion 221 of the newly installed lower frame 220 can be aligned on the same plane.

[0058] Note that the outdoor side wall portion 221 of the newly installed lower frame 220 is also aligned to be on the same plane as the first outdoor side wall portions 321a and 421a of the newly installed vertical frames 320 and 420, which will be described later. Thereby, the appearance surface (the surfaces of the outdoor side wall portions 122, 221, 321a, and 421a) of the retrofit sash 1 is aligned on the same plane over the four sides, so that the appearance of the retrofit sash 1 from the outdoor side is good.

[0059] The connecting portion 234 is a portion that connects the outdoor side upper surface portion 231A arranged on the outdoor side and the indoor side upper surface portion 231B arranged on the indoor side in the base material main body 231, and is provided along the length direction of the base material main body 231 at a position on the indoor side of the attachment screw 225 of the newly installed lower frame 220 in the base material main body 231.

[0060] The outdoor upper surface portion 231A and the indoor upper surface portion 231B constitute the upper surface of the lower frame base material 230. The outdoor upper surface portion 231A and the indoor upper surface portion 231B have different heights toward the upper frame 100 side with the connecting portion 234 as the boundary. That is, for the base material main body 231, with the connecting portion 234 as the boundary, the indoor upper surface portion 231B is higher toward the upper frame 100 side than the outdoor upper surface portion 231A, and the upper surface of the lower frame base material 230 has a stepped shape at the connecting portion 234. Therefore, even if rainwater infiltrates between the newly installed lower frame 220 and the lower frame base material 230 from the outdoor side, it will not infiltrate to the indoor side beyond the connecting portion 234. Thus, according to this lower frame base material 230, the infiltrated rainwater can be blocked within the outdoor upper surface portion 231A of the base material main body 231, and the infiltration of rainwater into the indoor upper surface portion 231B can be prevented.

[0061] The connecting portion 234 of the present embodiment is composed of an inclined surface that slopes downward from the indoor upper surface portion 231B toward the outdoor upper surface portion 231A. However, the connecting portion 234 is not limited to an inclined surface and may be a substantially vertical wall surface.

[0062] The protruding legs 235a to 235c are protrudingly provided toward the existing lower frame 210 on the back surface (the surface on the side of the existing lower frame 210) of the indoor upper surface portion 231B of the base material main body 231 and extend parallel along the length direction of the base material main body 231. As shown in FIG. 5, the protruding legs 235a to 235c are arranged to face the surface of the angle portion 214 of the existing lower frame 210, which is the mounting target surface, and the inner peripheral surface 3a of the frame member 3, and protrude toward this mounting target surface.

[0063] The innermost protruding leg 235a is arranged at the indoor end of the base material main body 231. The indoor side surface of this protruding leg 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 arranged on the same plane as the indoor side surface 220a excluding the angle cover 223 of the newly installed lower frame 220. The angle cover 223 is mounted so as to cover these indoor side surfaces 220a and 230a across the indoor side surface 230a of the lower frame base material 230 and the indoor side surface 220a of the newly installed lower frame 220.

[0064] b4. Mounting structure of the lower frame base material As shown in FIGS. 2 and 5, the outdoor side of the lower frame base material 230 is placed on the overhanging portion 212 of the existing lower frame 210 via the height adjustment mechanism 50. For the details of this height adjustment mechanism 50, reference is further made to FIGS. 14 and 15 for description. FIG. 14 is a cross-sectional view of the height adjustment mechanism 50 as viewed from the front, and FIG. 15 is a cross-sectional view of the height adjustment mechanism 50 as viewed from the side.

[0065] The height adjustment mechanism 50 includes a base portion 51 attached to the back surface of the base material main body 231, a height adjustment screw 52 formed of a dish screw rotatably held by the base portion 51, and a support leg portion 53 screwed to the height adjustment screw 52.

[0066] The base portion 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 downward from both ends of the indoor side and the outdoor side of the contact portion 51a. The contact portion 51a and the side wall portions 51b, 51b extend along the length direction of the lower frame base material 230.

[0067] Between the side wall portions 51b, 51b, the height adjustment screw 52 is accommodated. Specifically, holding step portions 51c, 51c along the cross-sectional shape of the head portion 52a of the height adjustment screw 52 are respectively formed on the inner surfaces of the side wall portions 51b, 51b. The head portion 52a of the height adjustment screw 52 is inserted between the contact portion 51a and the pair of holding step portions 51c, 51c from the side of the base portion 51, and is rotatably held between the contact portion 51a and the holding step portions 51c, 51c.

[0068] As shown in FIG. 13, two long holes 237 for screw insertion extending 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. 14, the base portion 51 is fixed to the base material main body 231 by two mounting screws 54 that respectively penetrate the long holes 237. Since the long holes 237 are long in the indoor-outdoor direction, the fixing position of the base portion 51 in the indoor-outdoor direction can be finely adjusted.

[0069] The connection part 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 into the through hole 51d. Further, as shown in FIGS. 13 to 15, the base material main body 231 of the lower frame base material 230 has a long hole 238 formed in the same manner as the long hole 237 between adjacent long holes 237. The through hole 51d is arranged so as to face the inside of this long hole 238.

[0070] The support leg 53 has a screwing part 53a that screws onto the height adjustment screw 52, and a pair of L-shaped legs 53b, 53b that extend downward from the screwing part 53a with the height adjustment screw 52 sandwiched therebetween. The legs 53b, 53b are placed on the overhanging part 212 of the existing lower frame 210. The thickness of the support leg 53 in the indoor / outdoor direction is substantially the same as the interval between the pair of side wall parts 51b, 52b of the base part 51. Therefore, as shown in FIG. 15, the support leg 53 in a state where the screwing part 53a is screwed onto the height adjustment screw 52 is in surface contact with the pair of side wall parts 51b, 51b and is supported from the indoor / outdoor direction.

[0071] The height adjustment by the height adjustment mechanism 50 is performed by rotating the head 52a of the height adjustment screw 52 facing into the through hole 51d through the long hole 238 from the upper side of the lower frame base material 230 by a driver or the like. Since the support leg 53 is sandwiched between the pair of side wall parts 51b, 51b and cannot rotate, when the head 52a of the height adjustment screw 52 is rotated, the support leg 53 moves up and down along the axial direction of the height adjustment screw 52 between the side wall parts 51b, 51b. Thereby, since the height of the outdoor side of the lower frame base material 230 is adjusted, the levelness of the lower frame base material 230 can be easily finely adjusted.

[0072] At this time, although the support leg 53 of the height adjustment mechanism 50 abuts on the downwardly inclined overhanging part 212, since it is supported by the pair of side wall parts 51b, 51b, there is no risk of tilting. For this reason, 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.

[0073] Further, the pair of legs 53b, 53b of the support leg portion 53 are formed in an L shape and have a shape that protrudes left and right along the length direction of the lower frame base material 230 (the left - right direction in FIG. 14). Therefore, a large contact area with respect to the protruding portion 212 of the existing lower frame 210 can be ensured. For this reason, the height adjustment mechanism 50 can stably receive the load applied to the lower frame base material 230.

[0074] Next, the indoor side of the lower frame base material 230 is fixed to the frame member 3 by mounting screws 236 that penetrate the base material main body 231. These protruding leg portions 235a to 235c face the inner peripheral surface 3a of the frame member 3. The mounting screw 236 is disposed between a pair of the protruding leg portions 235b, 235c among them, penetrates the base material main body 231, and is screwed into the frame member 3.

[0075] Next, the indoor side of the upper frame base material 130 is fixed to the frame member 3 by mounting screws 134 that penetrate the base material main body 131 and the angle portion 112 of the existing upper frame 110. Among the plurality of protruding leg portions 133a to 133d erected on the base material main body 131, a pair of protruding leg portions 133a, 133b disposed on the indoor side face the surface of the angle portion 112 which is the mounting target surface and the inner peripheral surface 3a of the frame member 3. The mounting screw 134 is disposed between this pair of protruding leg portions 133a, 133b, penetrates the base material main body 131, and is screwed into the frame member 3.

[0076] Here, as shown in FIG. 15, the indoor-side end of the lower frame base member 230 has a gap D between the surface of the angle portion 214, which is the mounting target surface, and the inner peripheral surface 3a of the frame member 3, and is attached by the mounting screws 236. That is, in a state where the lower frame base member 230 is screwed to the mounting screws 236, a gap D is formed between the tips of the protruding leg portions 235a, 235b, 235c of the lower frame base member 230 and the surface of the angle portion 214 and the inner peripheral surface 3a of the frame member 3. This gap D is formed by setting the protruding height of the protruding leg portions 235a, 235b, 235c to a height of D1 - D2, where D1 is the designed distance between the base member body 231 of the lower frame base member 230 and the surface of the angle portion 214 and the inner peripheral surface 3a of the frame member 3, and D2 is the thickness of the waterstop tape 240 described later.

[0077] As a result, even when the mounting screws 236 are screwed in with the waterstop tape 240 disposed between the lower frame base member 230, the angle portion 214, and the frame member 3, there is no risk that the indoor-side end of the lower frame base member 230 will protrude inward (upper side in FIGS. 5 and 15) and tilt, and it becomes possible to form an appropriate mounting surface for the new lower frame 220.

[0078] b5. Water stop structure of the lower frame As shown in FIG. 5, a waterstop tape 240, which is a sealing material, is interposed between the protruding leg portions 235a to 235c of the lower frame base member 230 and the inner peripheral surface 3a (surface of the angle portion 214 of the existing lower frame 210). The waterstop tape 240 is adhered over the vicinity of the parting material 224 of the new lower frame 220 between the protruding leg portions 235a to 235c and the inner peripheral surface 3a of the frame member 3. The mounting screws 236 for fixing the indoor side of the lower frame base member 230 penetrate through this waterstop tape 240. For this reason, the outer peripheral surface of the mounting screw 236 is waterproofed.

[0079] In addition, a waterstop tape 241 is adhered across the indoor side surface 220a of the newly installed lower frame 220 and the indoor side surface 230a of the lower frame base material 230. The waterstop tape 241 extends from the indoor side surface 230a of the lower frame base material 230 across the portion adhered to the inner peripheral surface 3a of the frame member 3 of the waterstop tape 240. In the present embodiment, the indoor side surface 230a of the lower frame base material 230 and the indoor side surface 220a of the newly installed lower frame 220 are arranged on the same plane. Thereby, since the waterstop tape 241 can be adhered flatly, the adhesion workability is good, the adhesion state is also good, and the waterstop function can be improved.

[0080] <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 configured to include existing vertical frames 310 and 410, newly installed vertical frames 320 and 420, and vertical frame base materials 330 and 430.

[0081] c1. Existing vertical frame The existing vertical frames 310 and 410 are respectively attached to the left and right vertical side portions on the outdoor side of the opening 2 of the building. The existing vertical frames 310 and 410 have outdoor side wall portions 311 and 411 extending outwardly to the left and right at the outdoor side ends, and integrally have angle portions 312 and 412 extending so as to project inwardly at the indoor side ends. The angle portions 312 and 412 are fixed to the outdoor side ends of the inner peripheral surface 3a of the frame member 3.

[0082] The inner peripheral surfaces 310a and 410a of the existing vertical frames 310 and 410 are arranged flush with the inner peripheral surfaces 3a of the left and right frame members 3, respectively.

[0083] The existing vertical frames 310 and 410 have a plurality (three in the present embodiment) of protruding pieces 313 and 413 protruding from the inner peripheral surfaces 310a and 410a toward the inside of the opening 2 (the central side in FIG. 3, the right side in FIG. 6, and the left side in FIG. 7). The protruding pieces 313 and 413 extend parallel to each other along the length direction of the existing vertical frames 310 and 410.

[0084] The protruding pieces 313 and 413 are the remaining parts of the original protruding pieces 313a and 413a such as fins and ribs originally provided on the existing vertical frames 310 and 410 before being modified to the modified sash 1, when the original protruding pieces 313a and 413a (shown by broken lines in FIGS. 6 and 7) were cut off. Each of the protruding pieces 313 and 413 is at approximately the same height and protrudes further inward of the opening 2 than the inner peripheral surface 3a of the frame member 3. In the present embodiment, the protruding pieces 313 and 413 protrude about 5 mm from the inner peripheral surface 3a of the frame member 3.

[0085] c2. Newly installed vertical frame The new vertical frames 320 and 420 are attached to the inner peripheral sides of the existing vertical frames 310 and 410 with the vertical frame base materials 330 and 430 interposed therebetween. The new vertical frames 320 and 420 mainly consist of metal frame bodies, and integrally have first outdoor side wall portions 321a and 421a extending outwardly to the left and right at the outdoor side ends, and further integrally have second outdoor side wall portions 321b and 421b extending inwardly at the ends of the first outdoor side wall portions 321a and 421a.

[0086] The first outdoor side wall portions 321a and 421a extend substantially parallel to the outdoor side wall portions 311 and 411 of the existing vertical frames 310 and 410 and are arranged so as to cover the entire outdoor side wall portions 311 and 411. Also, the second outdoor side wall portions 321b and 421b are arranged so as to cover the outdoor side wall portions 311 and 411 of the existing vertical frames 310 and 410 from the left and right outer sides.

[0087] The newly installed vertical frames 320 and 420 have resin angle members 322 and 422 that extend toward the indoor side so as to protrude toward the indoor side at the indoor-side ends. The angle members 322 and 422 are integrally formed with the groove portion 11 in which the screen door 30 is stored, and are arranged at an interval from the inner peripheral surface 3a of the frame member 3. Resin angle covers 323 and 423 are attached between the angle members 322 and 422 and the inner peripheral surface 3a of the frame member 3. The boundary between the angle covers 323 and 423 and the inner peripheral surface 3a of the frame member 3 is shielded by resin L-shaped parting materials 324 and 424. The parting materials 324 and 424 are fixed to the inner peripheral surface 3a of the frame member 3 by mounting screws 324a and 424a.

[0088] The newly installed vertical frames 320 and 420 are fixed by mounting screws 326a, 326b, 426a, and 426b via spacer members 325 and 425 between the vertical frame base materials 330 and 430. The mounting screws 326a and 426a penetrate the central portions of the vertical frame base materials 330 and 430 and are screwed into the existing vertical frames 310 and 410. Further, the mounting screws 326b and 426b penetrate from the bottom of the groove portion 11 to the vicinity of the indoor-side ends of the vertical frame base materials 330 and 430.

[0089] c3. Vertical frame base material The vertical frame base materials 330 and 430 are arranged between the existing vertical frames 310 and 410 and the newly installed vertical frames 320 and 420. As shown in FIG. 8, a plurality of vertical frame base materials 330 and 430 are provided at intervals along the length direction of the existing vertical frames 310 and 410. The vertical frame base material 330 and the vertical frame base material 430 have the same configuration.

[0090] Details of the vertical frame base materials 330 and 430 are shown in FIG. 16. FIG. 16 is a perspective view of the back side of the vertical frame base materials 330 and 430 as viewed from the outdoor side. The vertical frame base materials 330 and 430 are made of metal and integrally have a base material body 331 and 431, an outdoor side wall portion 332 and 432, and protruding leg portions 333 and 433.

[0091] The base material bodies 331 and 431 are formed of plate-shaped members that are sufficiently shorter than the lengths of the existing vertical frames 310 and 410 in the longitudinal direction, and by covering the inner peripheral sides of the existing vertical frames 310 and 410 across the indoor-outdoor direction, a substantially flat mounting surface for the new vertical frames 320 and 420 is formed.

[0092] As shown in FIG. 8, a plurality of vertical frame base materials 330 and 430 are provided at intervals along the longitudinal direction of the existing vertical frames 310 and 410. The indoor-side ends of the base material bodies 331 and 431 are arranged on the inner peripheral surface 3a of the frame member 3 so as to cover the angle portions 312 and 412 of the existing vertical frames 310 and 410. In the present embodiment, the surfaces of the angle portions 312 and 412 of the existing vertical frames 310 and 410 and the inner peripheral surface 3a of the frame member 3 are the mounting target surfaces for the indoor-side ends of the vertical frame base materials 330 and 430.

[0093] As shown in FIGS. 6 and 7, the outdoor side wall portions 332 and 432 extend outward from the outdoor-side ends of the base material bodies 331 and 431. The outdoor side wall portions 332 and 432 extend substantially parallel to the outdoor side wall portions 311 and 411 of the existing vertical frames 310 and 410, and are arranged in contact with the outdoor side wall portions 311 and 411 between the first outdoor side wall portions 321a and 421a of the new vertical frames 320 and 420 and the outdoor side wall portions 311 and 411 of the existing vertical frames 310 and 410.

[0094] The protruding leg portions 333 and 433 are integrally formed at the indoor-side ends of the base material bodies 331 and 431. As shown in FIGS. 6 and 7, the protruding leg portions 333 and 433 cover the angle portions 312 and 412 and are arranged to face the inner peripheral surface 3a of the frame member 3, protruding from the back surfaces of the base material bodies 331 and 431 (the surfaces on the side of the existing vertical frames 310 and 410) toward the inner peripheral surface 3a of the frame member 3.

[0095] The protruding foot portions 333, 433 are arranged at the innermost ends of the vertical frame base members 330, 430 on the indoor side. The indoor side surfaces of these protruding foot portions 333, 433 form the indoor side surfaces 330a, 430a of the vertical frame base members 330, 430. As shown in FIGS. 6 and 7, these indoor side surfaces 330a, 430a are arranged on the same plane as the indoor side surfaces 320a, 420a of the newly installed vertical frames 320, 420 excluding the angle covers 323, 423. The angle covers 323, 423 are mounted so as to cover these indoor side surfaces 320a, 330a, 420a, 430a across the indoor side surfaces 330a, 430a of the vertical frame base members 330, 430 and the indoor side surfaces 320a, 420a of the newly installed vertical frames 320, 420.

[0096] c4. Mounting structure of the vertical frame base material The vertical frame base members 330, 430 are attached to the existing vertical frames 310, 410 by a pair of mounting stays 334, 434 on the back surface of the base member body 331. Each mounting stay 334, 434 is formed in a strip shape extending along the length direction of the vertical frame base members 330, 430, and is attached by mounting screws 337, 437 to long holes 335, 435, 336, 436 that are long in the indoor-outdoor direction and formed in the base member bodies 331, 431. Since the mounting stays 334, 434 are attached using the long holes 335, 435, 336, 436, the mounting positions of the mounting stays 334, 434 in the indoor-outdoor direction can be finely adjusted.

[0097] Each mounting stay 334, 434 has bending portions 334b, 434b that bend toward the existing vertical frames 310, 410 on both ends thereof rather than the fixing portions 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 more than the base member bodies 331, 431. The mounting stays 334, 434 are fixed to the inner peripheral surfaces 310a, 410a of the existing vertical frames 310, 410 avoiding the protruding pieces 313, 413 by mounting screws 338, 438 at both end portions 334a, 434a respectively. Thereby, the vertical frame base members 330, 430 are attached to the inner peripheral side of the existing vertical frames 310, 410.

[0098] Here, the attachment structure of the indoor-side ends of the vertical frame base members 330 and 430 is shown in Fig. 19. Fig. 19 shows one of the vertical frame base members 330. Since the other vertical frame base member 430 has the same configuration, for the other vertical frame base member 430, reference numerals will be given in parentheses during the description with reference to Fig. 19. The indoor-side ends of the vertical frame base members 330 and 430 are attached with a gap D between them and the inner peripheral surface 3a of the frame member 3 which is the attachment target surface. That is, in the state where the vertical frame base member 330 (430) is attached by the attachment stays 334 and 434, a gap D is formed between the tip of the protruding leg portion 333 (433) of the vertical frame base member 330 (430) and the inner peripheral surface 3a of the frame member 3. When the design distance between the base member body 331 (431) of the vertical frame base member 330 (430) and the inner peripheral surface 3a of the frame member 3 is D1 and the thickness of the water stop tape 340 (440) described later is D2, this gap D is formed by setting the protruding height of the protruding leg portion 333 (433) to a height of D1 - D2.

[0099] Thereby, even when the vertical frame base members 330 and 430 are attached with the water stop tapes 340 and 440 disposed between the vertical frame base members 330 and 430 and the frame member 3, there is no risk that the indoor-side ends of the vertical frame base members 330 and 430 will protrude inward (the right side in Figs. 6 and 19, the left side in Fig. 7) and tilt, and it becomes possible to form the attachment surface for the newly installed vertical frames 320 and 420 at an appropriate position.

[0100] c5. Water stop structure of the vertical frame As shown in Figs. 6 and 7, water stop tapes 340 and 440 which are sealing materials are interposed between the protruding leg portions 333 and 433 of the vertical frame base members 330 and 430 and the inner peripheral surface 3a (the surfaces of the angle portions 312 and 412 of the existing vertical frames 310 and 410). The water stop tapes 340 and 440 are adhered over the vicinity of the cut-off materials 324 and 424 as seen from the protruding pieces 313 and 413 of the existing vertical frames 310 and 410.

[0101] Also, waterproof tapes 341 and 441 are adhered across the indoor side surfaces 320a and 420a of the newly installed vertical frames 320 and 420 and the indoor side surfaces 330a and 430a of the vertical frame base materials 330 and 430. The waterproof tapes 341 and 441 extend from the indoor side surfaces 330a and 430a of the vertical frame base materials 330 and 430 across the portions adhered to the inner peripheral surface 3a of the frame member 3 of the waterproof tapes 340 and 440. In this embodiment, the indoor side surfaces 330a and 430a of the vertical frame base materials 330 and 430 and the indoor side surfaces 320a and 420a of the newly installed vertical frames 320 and 420 are arranged on the same plane. Thereby, since the waterproof tapes 341 and 441 can be adhered flatly, the adhesion workability is good, the adhesion state is also good, and the waterproof function can be improved. In this embodiment, the indoor side surfaces 325a and 425a of the spacer members 325 and 425 are also arranged on the same plane as the indoor side surfaces 320a, 420a, 330a, and 430, but the positions of the indoor side surfaces 325a and 425a of the spacer members 325 and 425 are not particularly limited.

[0102] Furthermore, between the existing vertical frames 310 and 410 and the newly installed vertical frames 320 and 420, waterproof materials 350 and 450 made of foamed rubber or the like are interposed. The waterproof materials 350 and 450 are sandwiched between the outdoor side wall portions 311 and 411 of the existing vertical frames 310 and 410 and the first outdoor side wall portions 321a and 421a of the newly installed vertical frames 320 and 420, and extend longitudinally along the length direction of the newly installed vertical frames 320 and 420.

[0103] The window frame 10 having the above configuration is framed in a rectangle by the upper frame 100, the lower frame 200, and the left and right vertical frames 300 and 400. Thereby, the newly installed frames (newly installed upper frame 120, newly installed lower frame 220, and newly installed vertical frames 320 and 420) of the retrofit sash 1 are attached so as to cover the inner peripheral side of the existing frames (existing upper frame 110, existing lower frame 210, and existing vertical frames 310 and 410) via the respective base materials 130, 230, 330, and 430.

Explanation of Reference Numerals

[0104] 1 Modified sash, 2 Opening, 3 Frame member, 3a Inner peripheral surface, 110 Existing upper frame (existing frame), 120 Newly installed vertical frame (newly installed frame), 130 Upper frame base material, 210 Existing lower frame (existing frame), 220 Newly installed lower frame (newly installed frame), 230 Lower frame base material, 310, 410 Existing vertical frames (existing frames), 320, 420 Newly installed vertical frames (newly installed frames), 330, 430 Vertical frame base materials, 112, 214, 312, 412 Angle parts, 133a, 133b, 235b, 235c, 333, 433 Protruding foot parts, 150, 240, 340, 440 Waterproof tape (sealing material), D Gap

Claims

[Claim 1] A remodeled sash comprising an existing frame remaining in an opening of a building, a new frame attached to cover the inner periphery of the existing frame, and a base material disposed between the existing frame and the new frame, A retrofit sash, in which the indoor end of the base material is attached with a gap between it and the surface to which it is attached.

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