Sash, modified sash, and method for modifying sash

Abstract

To provide a renovated sash for allowing new frames to be brought as close as possible to existing frames, when mounted, while enabling an increase in the opening size of a window frame.SOLUTION: A renovated sash 1 includes existing frames consisting of an existing upper frame 110, an existing lower frame 210, and existing vertical frames 310, 410 remaining in an opening 2 of a building, new frames consisting of a new upper frame 120, a new lower frame 220, and new vertical frames 320, 420 mounted covering an area on the inner periphery side of the existing frames, and a base material 130 arranged between the existing upper frame 110 and the new upper frame 120. The longitudinal size of the base material 130 is longer than the longitudinal size of the new upper frame 120, and both ends 130b of the base material 130 are arranged facing a space between the existing vertical frame 310 and the new vertical frames 320 420.SELECTED DRAWING: Figure 11

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 the 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 known as a retrofit sash is one in which a base material serving as an attachment surface of a new frame is provided between an existing frame and a new frame (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When retrofitting a sash, For existing vertical frames of various shapes it is desired to be retrofittable.

[0006] The present disclosure is, For existing vertical frames of various shapes retrofittable S sshi retrofitting An object of the present invention is to provide a sash and a method for retrofitting the sash that are retrofittable.

Means for Solving the Problems

[0007] The present disclosureis a retrofit sash comprising an existing upper frame (e.g., the existing upper frame 110 described later), an existing lower frame (e.g., the existing lower frame 210 described later), and existing vertical frames (e.g., the existing vertical frames 310, 410 described later) remaining in an opening of a building (e.g., the opening 2 described later). mounted on the inner peripheral side of A new upper frame (e.g., the new upper frame 120 described later), a new lower frame (e.g., the new lower frame 220 described later), and new vertical frames (e.g., the new vertical frames 320, 420 described later), and the existing vertical frame and the new vertical frame are arranged between the vertical frame base material (e.g., the vertical frame base material 330,430 ) and is provided with S a sash, wherein the vertical frame base material The vertical frame is disposed so as to face the prospective surface (e.g., the inner peripheral surfaces 310a and 410a described later) of the existing vertical frame with a gap therebetween, and has an opposing portion (e.g., the base material main bodies 331 and 431 described later) that faces the prospective surface of the existing vertical frame and a screw fixing portion (e.g., the portions of the mounting screws 338 and 438 described later) that is fixed to the prospective surface of the existing vertical frame, and is related to a window sash that does not have a screw fixing portion for the finding surface of the existing vertical frame .

[0008] The present disclosure is a retrofitted window sash (e.g., the retrofitted window sash 1 described later) including an existing frame including an existing upper frame (e.g., the existing upper frame 110 described later), an existing lower frame (e.g., the existing lower frame 210 described later), and an existing vertical frame (e.g., the existing vertical frames 310 and 410 described later) remaining in an opening of a building (e.g., the opening 2 described later), a new frame including a newly installed upper frame (e.g., the newly installed upper frame 120 described later), a newly installed lower frame (e.g., the newly installed lower frame 220 described later), and a newly installed vertical frame (e.g., the newly installed vertical frames 320 and 420 described later) attached to the inner peripheral side of the existing frame, and a vertical frame base material (e.g., the vertical frame base materials 330 and 430 described later) disposed between the existing vertical frame and the newly installed vertical frame. The vertical frame base material has an opposing portion (e.g., the base material main bodies 331 and 431 described later) that faces the prospective surface (e.g., the inner peripheral surfaces 310a and 410a described later) of the existing vertical frame with a gap therebetween and a screw fixing portion (e.g., the portions of the mounting screws 338 and 438 described later) fixed to the prospective surface of the existing vertical frame, and is not fixed to the finding surface of the existing vertical frame, and is related to a retrofitted window sash .

[0009] The present disclosure relates to a method for retrofitting a window sash in which a new window frame composed of a new upper frame (for example, the new upper frame 120 described later), a new lower frame (for example, the new lower frame 220 described later), and new vertical frames (for example, the new vertical frames 320 and 420 described later) is attached to the inner peripheral side of an existing window frame composed of an existing upper frame (for example, the existing upper frame 110 described later), an existing lower frame (for example, the existing lower frame 210 described later), and existing vertical frames (for example, the existing vertical frames 310 and 410 described later) remaining in an opening of a building (for example, the opening 2 described later). The method includes arranging vertical frame base materials (for example, the vertical frame base materials 330 and 430 described later) on the inner peripheral side of the existing vertical frames, arranging the vertical frame base materials so as to be spaced apart and opposed to the expected surfaces (for example, the inner peripheral surfaces 310a and 410a described later) of the existing vertical frames, and screw-fixing (for example, fixing by the mounting screws 338 and 438 described later) to the expected surfaces of the existing vertical frames, without screw-fixing to the found surfaces of the existing vertical frames. .

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Mode for Carrying Out the Invention

[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 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 the 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 the 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 the 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 the main part on the right side of the modified sash shown in FIG. 2. Further, FIG. 8 is a perspective view showing a state in which a base material is attached to the inner peripheral side of the existing frame of the modified sash.

[0014] As shown in Fig. 1, the modified sash 1 according to the present invention is mounted on the outdoor side of the 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 housed in the window frame 10, and a screen door 30 that is slidably housed 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 the modified sash 1 as viewed from the outdoor side.

[0015] As shown in Figs. 2 and 3, the shoji 20 shown in the present 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, and to be opened toward the outdoor side and closed toward the indoor side.

[0016] The screen door 30 is housed in a groove portion 11 provided on 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 is housed on one vertical frame 300 side in a state where the net portion 31 is folded. 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 a state where the screen door 30 is folded toward the vertical frame 300 side, and a state where the screen door 30 is extended is shown by a dashed-dotted 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 new 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 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 broken line in FIG. 4) that was originally provided on the existing upper frame 110 before being modified to the modified sash 1 when 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.

[0019] 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.

[0020] The existing upper frame 110 further has a protruding piece 113. The protruding piece 113 projects from the outdoor side end of the angle portion 112 toward the inside of the opening 2 (the lower side in FIGS. 2 and 4). This protruding piece 113 is the remaining part of the protruding piece 113a (shown by a broken line in FIG. 4) that was originally provided on the existing upper frame 110 before being modified to the modified sash 1 when the existing protruding piece 113a was cut. The protruding piece 113 projects toward the inside of the opening 2 more than the inner peripheral surface 3a of the frame member 3.

[0021] a2. New upper frame The new 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 new upper frame 120 mainly consists of a metal frame body and has an overhanging portion 121 that projects further outside than the shoji 20 on the outdoor side. The overhanging portion 121 slopes slightly downward toward the outdoor side and has an outdoor side wall portion 122 that rises upward at its tip. The outdoor side wall portion 122 extends substantially parallel so as to face the outdoor side wall portion 111 of the existing upper frame 110 and is arranged to cover the entire outdoor side wall portion 111 from the outdoor side.

[0022] The outdoor side wall portion 122 has a plurality of ribs 122a to 122c protruding toward the indoor side. The rib 122a is disposed at the upper end portion of the outdoor side wall portion 122. The ribs 122b and 122c are disposed below the rib 122a and protrude so as to abut against the outdoor side wall portion 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.

[0023] The newly installed upper frame 120 has a resin angle member 123 extending so as to protrude 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 disposed at a distance 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.

[0024] 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 penetrate 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 penetrate from the newly installed 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 newly installed upper frame 120. As shown in FIG. 8, the upper frame base material 130 is attached only on 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.

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

[0027] The base material main 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 across the indoor / outdoor direction. The indoor-side end of the base material main 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.

[0028] The outdoor side wall portion 132 extends upward from the outdoor-side end of the base material main 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 and 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.

[0029] The protruding portions 133a to 133d project from the back surface (the surface on the side of the existing upper frame 110) of the base material main body 131 toward the existing upper frame 110 so as to extend parallel along the longitudinal direction of the base material main body 131 (the extending direction of the upper frame 100). As shown in FIG. 4, a pair of indoor protruding portions 133a and 133b among the protruding portions 133a to 133d are disposed to face the surface of the angle portion 112 of the existing upper frame 110 and the inner peripheral surface 3a of the frame member 3, and protrude toward the surface of the angle portion 112 and the inner peripheral surface 3a of the frame member 3.

[0030] The most indoor protruding portion 133a is disposed at the most indoor end of the base material main body 131. The indoor side surface of this protruding portion 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 disposed 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 mounted so as to cover these indoor side surfaces 120a and 130a 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.

[0031] In addition, when rainwater infiltrates into the upper frame base material 130, the protruding portions 133a to 133d also have a function of blocking the rainwater and preventing it from further infiltrating into the indoor side. In particular, the outermost protruding portion 133d functions as a first weir that first blocks the rainwater infiltrating from the outdoor side.

[0032] Here, the arrangement configuration of the upper frame base material 130 in the upper frame 100 will be further described. As shown in FIGS. 10 to 12, the dimension of the upper frame base material 130 in the length direction (the left - right direction in FIG. 1) is formed to be larger than the dimension of the new upper frame 120 in the length direction (the left - right direction in FIG. 1). Both end portions 130b, 130b of the upper frame base material 130 are respectively arranged facing the space S between the existing vertical frames 310 (410) and the new vertical frames 320 (420). Specifically, both end portions 130b of the upper frame base material 130 are arranged on the outer peripheral side of the new vertical frames 320 (420), that is, on the side of the existing vertical frames 310 (410).

[0033] Thereby, as shown by the arrow in FIG. 12, the upper frame base material 130 can drain some or all of the infiltrated rainwater from the end portion 130b of the upper frame base material 130 between the existing vertical frames 310, 410 and the new vertical frames 320, 420. As a result, there is no need to secure a space for accumulating rainwater between the new upper frame 120 and the upper frame base material 130, or the space for accumulating rainwater can be reduced. Therefore, as shown in FIG. 4, the distance D between the new upper frame 120 and the upper frame base material 130 can be made as small as possible and brought close to each other. Accordingly, according to this retrofit sash 1, the opening dimension of the window frame 10 can be increased by the amount that the distance D can be reduced.

[0034] Also, as shown in FIGS. 11 and 12, the end face 130c of the upper frame base material 130 is not in contact with the existing vertical frames 310, (410), and there is a gap between the end face 130c of the upper frame base material 130 and the existing vertical frames 310, (410). Therefore, when the upper frame base material 130 is attached to the inner peripheral side of the existing upper frame 110, there will be no interference with the existing vertical frames 310 and 410.

[0035] Furthermore, since the back surface of the base material main body 131 has the protruding portion 133d, rainwater that has entered onto the upper frame base material 130 can be guided in the length direction without further entering the indoor side, and quickly drained from the end portion 130b between the existing vertical frames 310, 410 and the newly installed vertical frames 320, 420.

[0036] 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.

[0037] The attachment member 40 includes a base portion 41 attached to the back surface of the base material main 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 composed of 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.

[0038] 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.

[0039] 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 body 131. The long holes 136 are arranged on the outdoor side of the outermost outdoor protrusion 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 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.

[0040] The mounting piece 42 is made of a metal plate extending substantially parallel to the base material 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 from below the outdoor side wall portion 111 sandwiched between the clamping pieces 42a, 42a toward the indoor side and is arranged so as to be sandwiched between the pair of support plate portions 41a, 41a on the base 41.

[0041] Between a pair of clamping pieces 42a, 42a, with the outdoor side wall portion 111 sandwiched therebetween, a mounting screw 45 that penetrates the mounting piece 42 from below 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.

[0042] 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.

[0043] 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 end of the upper frame base material 130 is fixed to the existing upper frame 110.

[0044] 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. Further, 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. For this reason, 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.

[0045] The mounting 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 mounting 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. Thereby, 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.

[0046] 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 portions 133a to 133d erected on the base material main body 131, a pair of protruding portions 133a and 133b disposed on the indoor side face the surface of the angle portion 112 that is the mounting target surface and the inner peripheral surface 3a of the frame member 3. The mounting screw 134 is disposed between the pair of protruding portions 133a and 133b, penetrates the base material main body 131, and is screwed into the frame member 3.

[0047] The upper frame base member 130 is attached to the inner peripheral side of the existing upper frame 110 by having the protruding portions 133a and 133b arranged to face the frame member 3, and having a predetermined space S1 between the base member main body 131 of the base member 130 and the inner peripheral surface 3a of the frame member 3 as shown in FIG. 4. In the present embodiment, this space S1 is set such that the distance between the base member main 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 of the protruding piece 113 of the existing upper frame 110. Thereby, since the protruding piece 113 of the existing upper frame 110 is completely accommodated in the space S1, it does not interfere with the upper frame base member 130.

[0048] a5. Waterstop 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 portions 133a and 133b on the indoor side of the upper frame base member 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 parting material 125 of the new upper frame 120. The mounting screw 134 for fixing the indoor side of the upper frame base member 130 penetrates through this waterstop tape 150. Therefore, the outer peripheral surface of the mounting screw 134 is waterproofed.

[0049] Also, a waterstop tape 151 is adhered over the indoor side surface 120a of the new upper frame 120 and the indoor side surface 130a of the upper frame base member 130. The waterstop tape 151 extends from the indoor side surface 130a of the upper frame base member 130 so as to overlap the portion 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 member 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.

[0050] 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 newly installed upper frame 120. These waterstops 160 to 162 extend longitudinally along the length direction of the newly installed upper frame 120.

[0051] 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 newly installed 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. Further, the waterstop 161 is sandwiched between the outdoor side wall portion 122 of the newly installed upper frame 120 and the outdoor side wall portion 132 of the upper frame base material 130. Furthermore, 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 newly installed upper frame 120 and the base material main body 131.

[0052] <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 newly installed lower frame 220, and a lower frame base material 230.

[0053] 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 newly installed 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 slopes slightly 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 at about the same height as the inner peripheral surface 3a of the frame member 3, but is not limited thereto.

[0054] The existing lower frame 210 has a projecting portion 212 that projects outward from the lower part of the standing wall portion 211 toward the outdoor side, sloping slightly downward, on the outdoor side of the standing wall portion 211. The projecting portion 212 projects outward 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. At the outdoor side end of the projecting portion 212, there is an outdoor side wall portion 213 that extends downward. Also, the existing lower frame 210 integrally has an angle portion 214 that extends so as to project 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.

[0055] b2. New lower frame The new lower frame 220 is attached to the inner peripheral side of the existing lower frame 210 with the lower frame base material 230 interposed therebetween. The new lower frame 220 mainly consists of a frame body made of metal, and has an outdoor side wall portion 221 that extends 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.

[0056] The new lower frame 220 has a resin angle member 222 that extends so as to project toward the indoor side 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 material 224. The partition material 224 is fixed to the inner peripheral surface 3a of the frame member 3 by mounting screws 224a.

[0057] 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 arranged on the indoor side of the standing wall portion 211 of the existing lower frame 210.

[0058] b3. Lower frame base material The lower frame base member 230 is disposed between the existing lower frame 210 and the newly installed lower frame 220. As shown in FIG. 8, a plurality of lower frame base members 230 are provided at intervals along the length direction of the existing lower frame 210.

[0059] Details of the lower frame base member 230 are shown in FIG. 15 shown. FIG. 15 is a perspective view of the lower frame base member 230. The lower frame base member 230 is made of metal and integrally has a base member 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.

[0060] The base member main body 231 is formed of a plate-like 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 newly installed lower frame 220 by covering the inner peripheral side of the existing lower frame 210 across the indoor and outdoor directions. The indoor-side end of the base member main body 231 is disposed on the inner peripheral surface 3a of the frame member 3 so as to cover the angle portion 214 of the existing lower frame 210. In the present embodiment, the surface of the angle portion 214 of the existing lower frame 210 and the inner peripheral surface 3a of the frame member 3 are the mounting target surfaces for the indoor-side end of the lower frame base member 230.

[0061] The outdoor side wall portion 232 extends downward from the outdoor-side end of the base member main 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 disposed at a length similar to that of the outdoor side wall portion 221 of the newly installed lower frame 220 between the outdoor side wall portion 221 of the newly installed lower frame 220 and the outdoor side wall portion 213 of the existing lower frame 210.

[0062] The protruding step portion 233 is disposed at the connection portion between the base member main body 231 and the outdoor side wall portion 232, and is integrally formed from the base member main body 231 to the outdoor side wall portion 232 so as to partially bend and protrude toward the outdoor side from the outdoor side wall portion 232.

[0063] As shown in FIG. 5, the outdoor side wall portion 221 of the newly installed lower frame 220 is in contact with the protruding step portion 233 protruding from the outdoor side. For this reason, 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 step 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 the protruding step 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 clamping piece 42a of the mounting piece 42 in the mounting member 40. Therefore, by bringing the outdoor side wall portion 221 of the newly installed lower frame 220 into contact with the protruding step 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.

[0064] 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 surfaces (the surfaces of the outdoor side wall portions 122, 221, 321a, and 421a) of the retrofit sash 1 are aligned on the same plane over the four sides, so that the appearance of the retrofit sash 1 from the outdoor side is good.

[0065] 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 mounting screw 225 of the newly installed lower frame 220 in the base material main body 231.

[0066] 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, the base material main body 231 is higher toward the upper frame 100 side on the indoor upper surface portion 231B than on the outdoor 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 infiltrates between the newly installed lower frame 220 and the lower frame base material 230 from the outside, it will not infiltrate to the indoor side of the connecting portion 234. Therefore, 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 to the indoor upper surface portion 231B can be prevented.

[0067] 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, but the connecting portion 234 is not limited to the inclined surface and may be a substantially vertical wall surface.

[0068] The protruding portions 235a to 235c protrude toward the existing lower frame 210 from 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 portions 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.

[0069] The innermost protruding portion 235a is arranged at the indoor end of the base material main body 231. The indoor side surface of this protruding portion 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.

[0070] 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, refer to FIGS. 16 and 17 which will be described below. FIG. 16 is a cross-sectional view of the height adjustment mechanism 50 seen from the front, and FIG. 17 is a cross-sectional view of the height adjustment mechanism 50 seen from the side.

[0071] 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 composed of a dish screw rotatably held by the base portion 51, and a support leg portion 53 screwed to the height adjustment screw 52.

[0072] 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.

[0073] The height adjustment screw 52 is accommodated between the side wall portions 51b, 51b. 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.

[0074] FIG. 15 As shown, two screw insertion long holes 237 extending along the indoor-outdoor direction are formed in the base material main body 231 of the lower frame base material 230. FIG. 16As shown in the figure, the base 51 is fixed to the base material body 231 by two mounting screws 54 that penetrate through the elongated holes 237 respectively. Since the elongated holes 237 are long in the indoor / outdoor direction, the fixing position of the base 51 in the indoor / outdoor direction can be finely adjusted.

[0075] A through hole 51d having a diameter smaller than the outer diameter of the head 52a of the height adjustment screw 52 is formed in the contact portion 51a. 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 FIG. 15 ~FIG. 17 As shown in the figure, the base material body 231 of the lower frame base material 230 has an elongated hole 238 formed between adjacent elongated holes 237 in the same manner as the elongated hole 237. The through hole 51d is arranged so as to face the inside of the elongated hole 238.

[0076] The support leg 53 has a threaded portion 53a that is screwed onto the height adjustment screw 52, and a pair of L-shaped legs 53b, 53b that extend downward from the threaded portion 53a with the height adjustment screw 52 sandwiched therebetween. The legs 53b, 53b are placed on the overhanging portion 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 portions 51b, 52b of the base 51. For this reason, as shown in FIG. 17 As shown in the figure, the support leg 53 in a state where the threaded portion 53a is screwed onto the height adjustment screw 52 is in surface contact with the pair of side wall portions 51b, 51b and is supported from the indoor / outdoor direction.

[0077] The height adjustment by the height adjustment mechanism 50 is performed by rotating the head 52a of the height adjustment screw 52 facing the inside of the through hole 51d through the elongated 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 portions 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 portions 51b, 51b. As a result, the height of the outdoor side of the lower frame base material 230 is adjusted, so that the levelness of the lower frame base material 230 can be easily and finely adjusted.

[0078] At this time, although the support leg portion 53 of the height adjustment mechanism 50 abuts on the overhanging portion 212 that slopes downward, since it is supported by the pair of side wall portions 51b, 51b, there is no fear of tilting. For this reason, the height adjustment mechanism 50 can stably support the outdoor side of the lower frame base material 230 in a height-adjustable manner.

[0079] Also, the pair of leg portions 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 (the left-right direction in the figure 16 of the lower frame base material 230). Therefore, a large contact area with respect to the overhanging 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.

[0080] 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 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 portions 235b, 235c and is screwed into the frame member 3 through the base material main body 231.

[0081] 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 portions 133a to 133d erected on the base material main body 131, a pair of protruding portions 133a, 133b disposed on the indoor side face the surface of the angle portion 112 that 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 portions 133a, 133b and is screwed into the frame member 3 through the base material main body 131.

[0082] Here, the indoor side end of the lower frame base material 230 is shown in the figure 5As shown in the figure, there is a gap D between the surface of the angle portion 214, which is the surface to be attached, and the inner peripheral surface 3a of the frame member 3, and it is attached by the attachment screw 236. That is, in a state where the lower frame base material 230 is screwed to the attachment screw 236, a gap D is formed between the tips of the protruding portions 235a, 235b, 235c of the lower frame base material 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 portions 235a, 235b, 235c to a height of D1 - D2, where D1 is the design distance between the base material main body 231 of the lower frame base material 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 water stop tape 240 described later.

[0083] Thereby, even when the attachment screw 236 is screwed in with the water stop tape 240 disposed between the lower frame base material 230, the angle portion 214, and the frame member 3, there is no possibility that the indoor side end of the lower frame base material 230 protrudes inward (upper side in FIGS. 5 and 15) and tilts, and it becomes possible to form an attachment surface for the new lower frame 220 at an appropriate position.

[0084] b5. Waterstop structure of the lower frame As shown in FIG. 5, a water stop tape 240, which is a sealing material, is interposed between the protruding portions 235a to 235c of the lower frame base material 230 and the inner peripheral surface 3a (the surface of the angle portion 214 of the existing lower frame 210). The water stop tape 240 is adhered over the vicinity of the parting material 224 of the new lower frame 220 between the protruding portions 235a to 235c and the inner peripheral surface 3a of the frame member 3. The attachment screw 236 for fixing the indoor side of the lower frame base material 230 penetrates through this water stop tape 240. For this reason, water stop is performed on the outer peripheral surface of the attachment screw 236.

[0085] In addition, a waterproof 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 waterproof tape 241 extends from the indoor side surface 230a of the lower frame base material 230 to the portion where it is adhered to the inner peripheral surface 3a of the frame member 3 of the waterproof 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 waterproof tape 241 can be adhered flatly, the adhesion workability is good, the adhesion state is also good, and the waterproof function can be improved. b6. Drainage structure of the lower frame As shown in FIG. 5, a drain hole 215 is provided at the lower part of the vertical wall portion 211 of the existing lower frame 210. This drain hole 215 was opened in the vertical wall portion 211 of the existing lower frame 210 prior to the attachment of the lower frame base material 230 and the newly installed lower frame 220.

[0086] In this retrofitted window sash 1, since the mounting screw 225 for attaching the newly installed lower frame 220 penetrates the outdoor upper surface portion 213A of the newly installed lower frame 220 and the lower frame base material 230 on the indoor side of the vertical wall portion 211, as indicated by the arrow in FIG. 5, there is a concern that rainwater may penetrate through the mounting screw 225 from the newly installed lower frame 220 and accumulate on the existing lower frame 210 on the indoor side of the vertical wall portion 211. However, by forming the drain hole 215 at the lower part of the vertical wall portion 211, the rainwater that has penetrated to the indoor side of the vertical wall portion 211 can be drained to the outdoor side of the vertical wall portion 211 through the drain hole 215. The rainwater drained to the outdoor side of the vertical wall portion 211 flows down on the overhanging portion 212 of the existing lower frame 210 and is drained outdoors from between the 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.

[0087] One or a plurality of drain holes 215 are provided in the vertical wall portion 211 along the length direction of the vertical wall portion 211. In particular, it is preferable to provide the drain holes 215 on both end sides (the side of the vertical frames 300 and 400) in the length direction of the vertical wall portion 211 because drainage can be achieved from both ends of the lower frame 200, and the drainage can be made less conspicuous.

[0088] As shown in FIG. 5, a predetermined space 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. Thereby, 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 screw 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 down quickly to the existing lower frame 210 side from the long hole 237 or the like.

[0089] Also, as shown in FIG. 5, the newly installed lower frame 220 has an inclined 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 inclined portion 226, and the mounting screw 225 of the newly installed lower frame 220 penetrates through this inclined portion 226. Above the inclined 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 inclined portion 226 and the upper wall portion 227 is sealed by a sealing member 228 mounted from the outdoor side. Therefore, the rainwater that has infiltrated into the inclined portion 226 through the mounting screw 225 can also be drained to the outside through the gap of the sealing member 228 along the inclined surface of the inclined portion 226.

[0090] <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.

[0091] 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 that extend outward to the left and right at the outdoor side ends, and integrally have angle portions 312 and 412 that extend so as to project inward on the indoor side 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.

[0092] The inner peripheral surfaces 310a and 410a of the existing vertical frames 310 and 410 are arranged flush with the inner peripheral surface 3a of the left and right frame members 3 respectively.

[0093] The existing vertical frames 310 and 410 have a plurality (three in this embodiment) of protruding pieces 313 and 413 that protrude 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.

[0094] The protruding pieces 313 and 413 are the remaining parts of the existing protruding pieces 313a and 413a (shown by broken lines in FIGS. 6 and 7), such as fins and ribs, which were originally provided on the existing vertical frames 310 and 410 before being modified to the retrofit sash 1, when the existing protruding pieces 313a and 413a were cut. Each of the protruding pieces 313 and 413 is at substantially the same height and protrudes further toward the inside of the opening 2 than the inner peripheral surface 3a of the frame member 3. In this embodiment, the protruding pieces 313 and 413 protrude about 5 mm from the inner peripheral surface 3a of the frame member 3.

[0095] c2. New 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 frames, and integrally have first outdoor side wall portions 321a and 421a that extend toward the left and right outer sides at the outdoor side ends, and further integrally have second outdoor side wall portions 321b and 421b that extend toward the indoor side at the ends of the first outdoor side wall portions 321a and 421a.

[0096] 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 to cover the entire outdoor side wall portions 311 and 411. Also, the second outdoor side wall portions 321b and 421b are arranged 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.

[0097] The newly installed vertical frames 320 and 420 have resin angle members 322 and 422 that extend 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 portions 11 in which the screen doors 30 are stored, and are arranged at intervals 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.

[0098] 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.

[0099] 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.

[0100] Details of the vertical frame base materials 330 and 430 are shown in FIG. 18 shown in FIG. 18 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 a protruding portion 333 and 433.

[0101] The base material bodies 331 and 431 are formed of plate-like 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.

[0102] 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 disposed 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.

[0103] 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 disposed 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.

[0104] The protruding 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 portions 333 and 433 cover the angle portions 312 and 412 and are disposed opposite to 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.

[0105] The protruding portions 333 and 433 are arranged at the innermost ends of the vertical frame base members 330 and 430. The inner side surfaces of these protruding portions 333 and 433 form the inner side surfaces 330a and 430a of the vertical frame base members 330 and 430. As shown in FIGS. 6 and 7, these inner side surfaces 330a and 430a are arranged on the same plane as the inner side surfaces 320a and 420a of the newly installed vertical frames 320 and 420, excluding the angle covers 323 and 423. The angle covers 323 and 423 are mounted so as to cover these inner side surfaces 320a, 330a, 420a, and 430a across the inner side surfaces 330a and 430a of the vertical frame base members 330 and 430 and the inner side surfaces 320a and 420a of the newly installed vertical frames 320 and 420.

[0106] c4. Mounting structure of the vertical frame base material The vertical frame base members 330 and 430 are attached to the existing vertical frames 310 and 410 by a pair of mounting stays 334 and 434 on the back surface of the base member body 331. Each mounting stay 334 and 434 is formed in a strip shape extending along the length direction of the vertical frame base members 330 and 430, and is attached by mounting screws 337 and 437 to the long holes 335, 435, 336, and 436 that are long in the indoor-outdoor direction and formed in the base member bodies 331 and 431. Since the mounting stays 334 and 434 are attached using the long holes 335, 435, 336, and 436, the mounting positions of the mounting stays 334 and 434 in the indoor-outdoor direction can be finely adjusted.

[0107] Each mounting stay 334 and 434 has bending portions 334b and 434b that bend toward the existing vertical frames 310 and 410 on both ends of the mounting stay 334 and 434 rather than the fixed portions with the mounting screws 337 and 437. As a result, both ends 334a and 434a of the mounting stays 334 and 434 protrude toward the existing vertical frames 310 and 410 more than the base member bodies 331 and 431. The mounting stays 334 and 434 are fixed to the inner peripheral surfaces 310a and 410a of the existing vertical frames 310 and 410, avoiding the protruding pieces 313 and 413, respectively, by the mounting screws 338 and 438 at both ends 334a and 434a. As a result, the vertical frame base members 330 and 430 are attached to the inner peripheral sides of the existing vertical frames 310 and 410.

[0108] c5. Waterstop structure of the vertical frame As shown in FIGS. 6 and 7, between the protruding portions 333 and 433 of the vertical frame base members 330 and 430 and the inner peripheral surface 3a of the frame member 3 (the surfaces of the angle portions 312 and 412 of the existing vertical frames 310 and 410), water-stop tapes 340 and 440, which are sealing materials, are interposed. 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.

[0109] Also, water-stop tapes 341 and 441 are adhered over the indoor side surfaces 320a and 420a of the new vertical frames 320 and 420 and the indoor side surfaces 330a and 430a of the vertical frame base members 330 and 430. The water-stop tapes 341 and 441 extend from the indoor side surfaces 330a and 430a of the vertical frame base members 330 and 430 over the portion where they are adhered to the inner peripheral surface 3a of the frame member 3 of the water-stop tapes 340 and 440. In the present embodiment, the indoor side surfaces 330a and 430a of the vertical frame base members 330 and 430 and the indoor side surfaces 320a and 420a of the new vertical frames 320 and 420 are arranged on the same plane. Thereby, since the water-stop tapes 341 and 441 can be adhered flatly, the adhesion workability is good, the adhesion state is also good, and the water-stop function can be improved. In the present 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 430a, but the positions of the indoor side surfaces 325a and 425a of the spacer members 325 and 425 are not particularly limited.

[0110] Furthermore, between the existing vertical frames 310 and 410 and the new vertical frames 320 and 420, water-stop materials 350 and 450 made of foamed rubber or the like are interposed. The water-stop 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 new vertical frames 320 and 420, and extend longitudinally along the length direction of the new vertical frames 320 and 420.

[0111] 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. Accordingly, the new frames of the retrofit sash 1 (the new upper frame 120, the new lower frame 220, and the new vertical frames 320 and 420) are attached via the respective base materials 130, 230, 330, and 430 so as to cover the inner peripheral side of the existing frames (the existing upper frame 110, the existing lower frame 210, and the existing vertical frames 310 and 410).

Explanation of Signs

[0112] 1 Retrofitting sash 2 Opening 110 Existing upper frame 120 New upper frame 130 Base material for upper frame 130b End portion 133d Protrusion 210 Existing lower frame 220 New lower frame 310, 410 Existing vertical frames 320, 420 New vertical frames

Claims

1. A window sash comprising a new frame consisting of a new upper frame, a new lower frame, and a new vertical frame disposed on the inner peripheral side of an existing frame consisting of an existing upper frame, an existing lower frame, and an existing vertical frame remaining at an opening of a building, a vertical frame base material disposed between the existing vertical frame and the new vertical frame, wherein the vertical frame base material has an opposing portion disposed so as to be spaced apart and opposed to an expected surface of the existing vertical frame, a screw fixing portion fixed to the expected surface of the existing vertical frame, and an outdoor side wall portion that abuts against an outdoor side surface of an outdoor side wall portion of the existing vertical frame, and does not have a screw fixing portion with respect to a finding surface of the existing vertical frame.

2. The window sash according to claim 1, wherein the vertical frame base material is fixed to the expected surface of the existing vertical frame at the opposing portion.

3. The window sash according to claim 1, further comprising a water stop material that abuts against the outdoor side surface of the outdoor side wall portion of the existing vertical frame.

4. A retrofit window sash comprising a new frame consisting of a new upper frame, a new lower frame, and a new vertical frame disposed on the inner peripheral side of an existing frame consisting of an existing upper frame, an existing lower frame, and an existing vertical frame remaining at an opening of a building, a vertical frame base material disposed between the existing vertical frame and the new vertical frame, wherein the vertical frame base material has an opposing portion disposed so as to be spaced apart and opposed to an expected surface of the existing vertical frame, a screw fixing portion fixed to the expected surface of the existing vertical frame, and an outdoor side wall portion that abuts against an outdoor side surface of an outdoor side wall portion of the existing vertical frame, and is not screwed to a finding surface of the existing vertical frame.

5. The retrofit window sash according to claim 4, wherein the vertical frame base material is fixed to the expected surface of the existing vertical frame at the opposing portion.

6. A method for retrofitting a window sash, in which a new frame consisting of a new upper frame, a new lower frame, and a new vertical frame is attached to the inner peripheral side of an existing frame consisting of an existing upper frame, an existing lower frame, and an existing vertical frame remaining at an opening of a building, wherein a vertical frame base material is disposed on the inner peripheral side of the existing vertical frame, the vertical frame base material has an opposing portion facing the expected surface of the existing vertical frame and an outdoor side wall portion extending outwardly toward the outer periphery at an outdoor end, and the vertical frame base material is disposed such that the opposing portion is spaced apart and opposed to the expected surface of the existing vertical frame and the outdoor side wall portion abuts against the outdoor side surface of the outdoor side wall portion of the existing vertical frame, and is screwed to the expected surface of the existing vertical frame and not screwed to the finding surface of the existing vertical frame.

7. ​ ​ The method for retrofitting a sash according to claim 6, wherein the vertical frame base material is screw-fixed to the expected surface of the existing vertical frame at the opposing portion.

Images