JP6366925B2 - Dry storage structure of sash frame - Google Patents

Description

  The present invention relates to a dry storage structure of a sash frame.

  In general, in order to attach a sash frame to a wall opening of a building, several anchor members are fixed to the sash frame in advance, and the anchor members are welded to reinforcing bars in the wall. The anchor member is a metal fitting spanned in the width direction of the sash frame, and its dimension is long in the width direction of the sash frame and shorter in the longitudinal direction of the sash frame. An anchor member and an adjacent anchor member are sufficiently separated in the longitudinal direction of the sash frame. In such a sash frame mounting structure, a wet construction method in which a filler such as mortar is filled around the welded portion after welding is generally performed.

Japanese Utility Model Publication No. 63-12584

  However, the method of storing the sash frame in the housing is not limited to such a wet method, and there is a dry method in which no filler is filled around the sash frame. In that case, it is desired to achieve a desired sash performance by the sash frame structure itself without depending on the filler.

  For example, in terms of fireproof performance, it is desirable to sufficiently suppress deformation of the sash frame that may occur when exposed to high temperatures due to fire. However, when a conventional anchor member is used in a dry-type storage method, the sash frame portion between one anchor member and the adjacent anchor member is not directly supported by the casing, This portion may be deformed by expansion or strength reduction. These two anchor members are separated from each other, and therefore, the deformable sash frame portion is relatively long, so that the amount of deformation tends to be large.

  The present invention has been made in view of such a problem, and one of the exemplary purposes of an embodiment thereof is to improve the rigidity of the sash frame in the dry storage structure of the sash frame, and thereby, for example, a sash during a fire. The object is to reduce or prevent the deformation of the frame.

  In order to solve the above-described problems, a sash frame dry storage structure according to an aspect of the present invention includes a sash frame and a sash frame having a space in the longitudinal direction to fix the sash frame to a housing. In the longitudinal direction of the sash frame over a length range including at least two housing fixing portions mounted on the housing side and the mounting positions of the at least two housing fixing portions mounted on the housing side of the sash frame. And a sash frame reinforcing material extending along.

  According to this aspect, the sash frame reinforcing material is provided over a relatively long distance along the longitudinal direction of the sash frame. Specifically, two or more chassis fixing portions for fixing the sash frame to the chassis are mounted on the chassis side of the sash frame, and the sash frame reinforcement is also attached to the chassis side of the sash frame. It is mounted over the mounting range in the longitudinal direction to the sash frame of the housing fixing part. In this way, in a dry sash frame structure that does not use a filler such as mortar, the sash frame portion between adjacent housing fixing parts is reinforced with the sash frame reinforcing material, and the rigidity of the sash frame is improved. Therefore, the deformation | transformation which can arise in the reinforcement part of a sash frame at the time of a fire is reduced or prevented, and the sash frame which improved the fireproof performance can be provided.

In the dry storage structure of the sash frame, the sash frame has an open cross section in a plane perpendicular to the longitudinal direction, and the sash frame and the sash frame reinforcing material form a closed cross section on the housing side of the sash frame. Also good.
Thus, forming a closed cross-section by combining the reinforcing material with a sash frame having an open cross-section greatly helps to improve the rigidity of the sash frame, and is effective for reinforcement.

The frame fixing part is a separate member from the sash frame reinforcement, and the frame fixing part is attached to the sash frame reinforcement so that the tabs of the sash frame are sandwiched between the frame fixing part and the sash frame reinforcement. May be.
Since the frame fixing part is a separate member from the sash frame reinforcing material, the position of the sash frame reinforcing material with respect to the frame fixing part can be adjusted, so the reinforcing material is attached to the frame fixing part at a desired location. It becomes possible. In addition, the attachment method in which a part of the sash frame is sandwiched in this way enables the sash frame and its reinforcing material to be securely fixed. In this case, for example, if the frame fixing part and the sash reinforcing material are tightened and fixed with screws or the like while the claw part of the sash frame is sandwiched between the sash frame reinforcing material and the frame fixing part, the mounting operation is compared. Easy.

The housing fixing part may be a member integrated with the sash frame reinforcing material.
In this case, since the members are integrated, the number of parts is reduced. In addition, since it is only necessary to attach the integrated member to the sash frame in the installation work, there is a possibility that it is somewhat more workable than attaching the frame fixing part and the sash frame reinforcement to the sash frame individually. There is.

The sash frame reinforcing material may be attached to a predetermined portion of the sash frame in the longitudinal direction of the sash frame. The dry storage structure of the sash frame may further include a housing fixture attached to the sash frame outside the predetermined portion in the longitudinal direction in order to fix the sash frame to the housing.
In this case, the sash frame reinforcing member may be attached to a portion where it is desired to increase the strength of the sash frame, for example, in the longitudinal center of the sash frame. Arbitrary frame fixing tools, for example, so-called piece anchors or other known anchor members may be used in combination with the sash frame portion where the sash frame reinforcing material is not provided. By using a relatively short reinforcing material in this manner, the reinforcing material can be lightened and the material cost can be reduced as compared with the case where a through-type reinforcing material is used. If the reinforcing material is light, the weight of the sash frame structure after mounting is also lightened.

The sash frame reinforcing material may be formed of a material having higher strength than the sash frame in a high temperature environment.
In this way, it is more effective in reducing or preventing deformation that may occur during a fire.

  The sash frame dry storage structure according to another aspect of the present invention includes a sash frame, a chassis fixing portion attached to the chassis side of the sash frame to fix the sash frame to the chassis, and a chassis of the sash frame And a sash frame reinforcing member that is elongated along the longitudinal direction of the sash frame over a length range that includes a position where the housing fixing portion is attached to the sash frame.

  According to this aspect, the elongated sash frame reinforcing material is provided along the longitudinal direction of the sash frame. A frame fixing part for fixing the sash frame to the frame is mounted on the frame side of the sash frame, and the sash frame reinforcing member is also mounted on the mounting part of the frame fixing part on the frame side of the sash frame. Thus, in a dry sash frame structure that does not use a filler such as mortar, the housing fixing portion and the sash frame portion in the vicinity thereof are reinforced with the sash frame reinforcing material, and the rigidity of the sash frame is improved. It is possible to provide a sash frame in which the deformation that may occur in the reinforcing portion of the sash frame during a fire is reduced or prevented, and the fire prevention performance is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the rigidity of a sash frame can be improved in the dry accommodation structure of a sash frame, and, thereby, the deformation | transformation of a sash frame at the time of a fire can be reduced or prevented, for example.

It is a schematic front view which illustrates the window to which the dry storage structure of the sash frame concerning a 1st embodiment of the present invention is applied. It is a schematic sectional drawing of the sash frame which concerns on 1st Embodiment of this invention. It is an AA arrow line view in FIG. It is a schematic sectional drawing of the sash frame which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the sash frame which concerns on 2nd Embodiment of this invention. It is a BB arrow directional view in FIG. It is a schematic sectional drawing of the sash frame which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing of the sash frame which concerns on 3rd Embodiment of this invention. It is CC sectional view taken on the line in FIG. It is a schematic front view which illustrates the window which applied the dry storage structure of the sash frame which concerns on 4th Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Moreover, the structure described below is an illustration and does not limit the scope of the present invention at all.

  FIG. 1 is a schematic front view illustrating a window 1 to which a sash frame dry storage structure according to a first embodiment of the invention is applied. The window 1 includes a sash frame 2 and a shoji 3. The sash frame 2 is a frame that supports the shoji 3 fixedly or movably for opening and closing, and includes an upper frame 2a, a lower frame 2b, a right vertical frame 2c, and a left vertical frame 2d.

  In FIG. 1, the arrangement of reinforcing elements for reinforcing the sash frame 2, for example, the reinforcing metal fittings 10, is schematically shown by broken lines. The reinforcing metal fitting 10 is provided through each of the upper frame 2a, the lower frame 2b, the right vertical frame 2c, and the left vertical frame 2d in the longitudinal direction. The reinforcing metal fitting 10 is provided over substantially the entire length of the sash frame along the longitudinal direction of the sash frame 2 except for the corners of the sash frame 2. The reinforcing metal fitting 10 is a separate member from the sash frame 2.

  Here, the longitudinal direction is the direction in which the sash frame 2 extends, the longitudinal directions of the upper frame 2a and the lower frame 2b are the left and right directions in FIG. 1, and the longitudinal directions of the right vertical frame 2c and the left vertical frame 2d. Is the vertical direction in FIG. In the following description, the width direction of the sash frame 2 may be referred to for convenience of explanation. The width direction is a direction perpendicular to the paper surface in FIG.

  As will be described in detail later, the sash frame 2 is fixed to the housing 4 (see FIG. 2) via the reinforcing metal fitting 10. Therefore, the reinforcing metal fitting 10 has not only a role of reinforcing the sash frame 2 but also a role of fixing the sash frame 2 to the housing 4.

  FIG. 2 is a schematic cross-sectional view of the sash frame 2 according to the first embodiment of the present invention. Specifically, FIG. 2 shows a cross-sectional view of the right vertical frame 2c. In FIG. 2, the longitudinal direction of the right vertical frame 2c is a direction perpendicular to the paper surface, and the width direction of the right vertical frame 2c is the vertical direction of the paper surface. FIG. 3 is a view taken along line AA in FIG. FIG. 3 shows the right vertical frame 2 c and the reinforcing metal fitting 10. In FIG. 3, the longitudinal direction of the right vertical frame 2c is the left-right direction, and the width direction of the right vertical frame 2c is the vertical direction. FIG. 4 is a schematic cross-sectional view of the sash frame 2 according to the first embodiment of the present invention. FIG. 4 shows a longitudinal sectional view of the upper frame 2a.

  2 and subsequent drawings show main parts related to the present embodiment, and other parts, for example, the peripheral structure of the sash frame 2 and the housing 4 are understood of the main parts related to the present embodiment. In order to facilitate, the outline shape is represented by a broken line, or the illustration is omitted as appropriate. For example, the reinforcing bars 5 are omitted in FIG.

  In the reinforcing metal fitting 10 according to the present embodiment, the sash frame 2 (the right vertical frame 2c in FIGS. 2 and 3 and the upper frame 2a in FIG. 4) is fixed to the housing 4. The frame fixing part 11 is configured as a member integrated with the sash frame reinforcing member 12. The sash frame reinforcing material 12 is a through plate material, and extends elongated in the longitudinal direction of the sash frame 2. Most of the reinforcing metal fitting 10 corresponds to the sash frame reinforcing material 12. Therefore, in this document, the reference to the reinforcing metal fitting 10 may be read as meaning the sash frame reinforcing material 12 depending on the context, and vice versa.

  The sash frame reinforcing material 12 is formed of a material having higher strength (for example, tensile strength or proof stress) than the sash frame 2 in a high temperature environment. The high temperature environment refers to, for example, a temperature range assumed at the time of a fire, for example, a high temperature exceeding 500 degrees. In the present embodiment, the sash frame 2 is formed of, for example, an aluminum material, and the sash frame reinforcing material 12 is formed of a steel material.

  The reinforcing metal fitting 10 includes an engaging portion 13 that engages with the sash frame 2. Several engaging portions 13 are provided at different positions in the longitudinal direction. Each engaging portion 13 has an engaging piece 14. The engaging piece 14 is formed by bending a part of the sash frame reinforcing member 12 on the sash frame reinforcing member 12 on the side opposite to the folded piece 24 of the housing fixing part 11 described later. The engaging pieces 14 are provided on both sides in the width direction. The engaging portion 13 may be provided on the sash frame reinforcing material 12 at or adjacent to the housing fixing portion 11, or provided on the sash frame reinforcing material 12 away from the housing fixing portion 11 in the longitudinal direction. Also good.

  The sash frame 2 includes a frame main body 16 facing the opening to which the window 1 (see FIG. 1) is attached, and a frame side wall 18 erected from the frame main body 16 toward the housing 4 on both sides in the width direction of the frame main body 16. And comprising. On the opening side of the frame body 16, a rail or the like for supporting or guiding the shoji 3 (see FIG. 1) is formed. Two claw portions 20 are provided on the sash frame 2 on the housing 4 side. Each claw portion 20 is formed by bending inward in the width direction so as to face each other from the end portions on the housing 4 side of the two frame side walls 18.

  When attaching the reinforcing bracket 10 to the sash frame 2, for example, the reinforcing bracket 10 is inserted from one end of the sash frame 2 along the tab portion 20, and the engaging portion 13 of the reinforcing bracket 10 is inserted into the tab portion 20 of the sash frame 2. Engage. That is, the claw portion 20 is sandwiched between the sash frame reinforcing member 12 and the engagement piece 14. In this way, the sash frame reinforcing member 12 is arranged at a predetermined position in the longitudinal direction so as to cover the sash frame 2 on the housing 4 side.

  The sash frame reinforcing member 12 is fixed to the sash frame 2 by abutting the fixing screw 22 against the sash frame 2. A screw hole for the fixing screw 22 is formed in the housing fixing part 11 and / or the sash frame reinforcing material 12. Two screw holes are formed side by side in the width direction, and the sash frame reinforcing material 12 is fixed to the sash frame 2 by fixing screws 22 at two locations in the width direction. When the fixing screw 22 is tightened in a state in which the sash frame reinforcing member 12 is disposed at the predetermined position in the longitudinal direction, the end of the fixing screw 22 is abutted against the frame body 16 of the sash frame 2 through this screw hole, thereby engaging The piece 14 is pressed against the claw portion 20. In this way, the sash frame reinforcing material 12 is fixed to the sash frame 2 at a specified position in the longitudinal direction.

  In some embodiments, the reinforcing metal fitting 10 may not include the engaging portion 13. In this case, for example, the sash frame reinforcing material 12 may be inserted between the claw portion 20 and the frame body 16. The end in the width direction of the sash frame reinforcement member 12 may be pressed against the claw portion 20 by abutment of the fixing screw 22 against the sash frame 2, and the sash frame reinforcement member 12 may be fixed to the sash frame 2.

  In this way, the sash frame reinforcing member 12 is mounted on the housing 4 side of the sash frame 2. Since the frame fixing portion 11 is integral with the sash frame reinforcing material 12, it can be said that the frame fixing portion 11 is also mounted on the frame 4 side of the sash frame 2, as with the sash frame reinforcing material 12.

  The sash frame 2 has an open cross section in a plane perpendicular to the longitudinal direction. As shown in the drawing, the open cross section of the sash frame 2 on the side of the housing 4 is composed of a frame body 16 and a frame side wall 18. The sash frame reinforcing member 12 has a width that crosses the space between the two frame side walls 18 of the sash frame 2, and connects the two claw portions 20. In this manner, the open cross section of the sash frame 2 is closed by mounting the sash frame reinforcement member 12 to the sash frame 2, and the sash frame 2 and the sash frame reinforcement are disposed on the housing 4 side of the sash frame 2 as shown in the figure. A substantially rectangular closed cross section made of the material 12 is formed.

  The sash frame 2 is fixed to the housing 4 by welding. Therefore, the frame fixing part 11 has a folded piece 24 welded to the reinforcing bar 5 protruding from the frame 4 toward the sash frame 2. 2 to 4 show a folded piece 24 formed at one end of the reinforcing metal fitting 10. In this embodiment, since the sash frame 2 is dry and attached to the housing 4, the reinforcing bars 5 are not filled with a filler such as mortar.

  In addition, the reinforcing metal fitting 10 includes, for example, the housing fixing portion 11 and the folded piece 24 at the other end (not shown). The reinforcing metal fitting 10 may have the housing fixing part 11 and the folded piece 24 at the center part thereof. The plurality of housing fixing portions 11 are arranged side by side in the longitudinal direction of the sash frame 2 so that two adjacent housing fixing portions 11 are spaced in the longitudinal direction of the sash frame 2. The interval between adjacent housing fixing parts 11 is, for example, constant, but may be different depending on the position in the longitudinal direction.

  In this way, the sash frame reinforcing member 12 formed integrally with the housing fixing portion 11 extends along the longitudinal direction of the sash frame 2 over a relatively long range of the sash frame 2. The length range in which the sash frame 2 extends includes the mounting position of each of the plurality of housing fixing portions 11 on the sash frame 2 (that is, the installation location of the housing fixing portion 11 in the sash frame 2).

  According to the present embodiment, the sash frame reinforcing member 12 is provided over substantially the entire length of the sash frame 2 along the longitudinal direction of the sash frame 2, and the plurality of folded pieces 24 for welding the sash frame 2 to the housing 4 are provided. The sash frame reinforcing material 12 is formed. In this way, in a dry sash frame structure that does not use a filler such as mortar, the sash frame portion between adjacent welded portions is reinforced by the sash frame reinforcing material 12, and the rigidity of the sash frame 2 is improved. In particular, when the sash frame reinforcing member 12 forms a closed cross-section with the sash frame 2, the rigidity of the sash frame 2 is significantly improved. Further, the sash frame reinforcing material 12 is formed of a material that is resistant to high temperatures as compared to the sash frame 2. Therefore, it is possible to provide the sash frame 2 in which deformation that may occur in the sash frame 2 at the time of a fire is reduced or prevented, and fire prevention performance is improved.

  FIG. 5 is a schematic cross-sectional view of a sash frame 2 according to the second embodiment of the present invention. Specifically, FIG. 5 shows a cross-sectional view of the right vertical frame 2c. 6 is a view taken in the direction of arrows BB in FIG. FIG. 7 is a schematic cross-sectional view of the sash frame 2 according to the second embodiment of the present invention. FIG. 7 shows a longitudinal sectional view of the upper frame 2a.

  The reinforcing metal fitting 10 according to the second embodiment is different from the first embodiment in which the housing fixing part 11 and the sash frame reinforcing material 12 are separate members in that they are separate members. About the remainder, 2nd Embodiment is the same as that of 1st Embodiment. In the following description, the description of similar parts will be omitted as appropriate to avoid redundancy.

  The plurality of housing fixing portions 11 are arranged at different positions in the longitudinal direction. In FIG. 6, a frame fixing part 11 (right side in the figure) arranged at one end of the sash frame reinforcing material 12 and a frame fixing part 11 (left side in the figure) arranged at the center of the sash frame reinforcing material 12 are shown. It is shown. The frame fixing part 11 is spanned in the width direction of the sash frame 2, and its dimension is long in the width direction of the sash frame 2, and shorter in the longitudinal direction of the sash frame 2. A folded piece 24 welded to the reinforcing bar 5 is provided in each of the housing fixing portions 11. The frame fixing part 11 is a welding part similar to a typical anchor member.

  Each housing fixing part 11 is attached to the sash frame reinforcing material 12 using a fixing screw 22 so that the claw 20 of the sash frame 2 is sandwiched between the housing fixing part 11 and the sash frame reinforcing material 12. . When the fixing screw 22 is tightened in a state where the housing fixing part 11 and the sash frame reinforcing material 12 are arranged at the specified positions in the longitudinal direction, the housing fixing part 11 and the sash frame reinforcing material 12 are pressed against the claw parts 20 respectively. The claw portion 20 is sandwiched between the housing fixing portion 11 and the sash frame reinforcing material 12. In this way, the housing fixing part 11 and the sash frame reinforcing material 12 are fixed to the sash frame 2 at a predetermined position in the longitudinal direction. In this case, unlike the first embodiment, the fixing screw 22 does not have to be abutted against the frame main body 16, so the end of the fixing screw 22 in the second embodiment may not be in contact with the frame main body 16.

  FIG. 8 is a schematic cross-sectional view of the sash frame 2 according to the third embodiment of the present invention. Specifically, FIG. 8 shows a longitudinal sectional view of the upper frame 2a. 9 is a cross-sectional view taken along the line CC in FIG. The third embodiment is basically the same as the second embodiment. However, in 3rd Embodiment, the frame side wall 18 has the extension part 26 in the housing side. Therefore, in the third embodiment, the attaching direction of the fixing screw 22 is adjusted so that the attaching operation of the fixing screw 22 (left side in the figure) below the extending portion 26 is facilitated. For this purpose, the housing fixing part 11 and the sash frame reinforcing member 12 each have a bent part 28 at the site of the screw hole for the fixing screw 22. In addition, as FIG. 9 shows, the folding piece 24 may be formed in the center part of the housing fixing | fixed part 11. As shown in FIG.

  FIG. 10 is a schematic front view illustrating the window 1 to which the sash frame dry storage structure according to the fourth embodiment of the invention is applied. The fourth embodiment differs from the first embodiment in that the reinforcing metal fitting 10 is partially provided in the longitudinal direction of the sash frame 2 and the reinforcing metal fitting 10 extends over almost the entire length of the sash frame. About the remainder, 4th Embodiment is as substantially the same as 1st Embodiment. Moreover, it is also possible to apply the reinforcing metal fitting 10 according to the second embodiment or the third embodiment to the fourth embodiment. In the following description, the description of similar parts will be omitted as appropriate to avoid redundancy.

  The reinforcing metal fitting 10 is attached to a predetermined portion of the sash frame 2 in the longitudinal direction of the sash frame 2. The reinforcing metal fitting 10 may be attached to a part where it is desired to increase the strength of the sash frame 2, for example, a part away from the corner of the sash frame 2 in the longitudinal direction, for example, a central part. The length of the reinforcing bracket 10 may be at least half of the total length of the sash frame 2, or at least 1/3, or at least 1/4.

  As shown in FIG. 10, one or a plurality of housing fixtures 30 are provided in the portion of the sash frame 2 where the reinforcing metal fitting 10 is not provided. The frame fixing tool 30 is attached to the sash frame 2 outside the reinforcing metal fitting 10 in the longitudinal direction in order to fix the sash frame 2 to the frame. The frame fixing tool 30 is arranged with a space in the longitudinal direction between the reinforcing metal fittings 10, and the adjacent frame fixing tool 30 is also arranged with a space in the longitudinal direction. The frame fixing tool 30 may be an arbitrary frame fixing tool such as a so-called piece anchor or other known anchor member. In this manner, the reinforcing bracket 10 can be shortened by using the housing fixture 30 in combination with the reinforcing bracket 10, so that the weight can be reduced and the material cost can be reduced as compared with the case where a through-type reinforcing material is used as described above. It becomes.

  In the above, this invention was demonstrated based on the Example. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiment, and various design changes are possible, various modifications are possible, and such modifications are within the scope of the present invention. By the way.

  In the above-described embodiment, the reinforcing metal fitting 10 is provided with a plurality of housing fixing portions 11. However, the number of housing fixing portions 11 provided in the reinforcing metal fitting 10 may be one. Even in this case, by providing the elongated sash frame reinforcing material 12 at the mounting portion of the housing fixing portion, the housing fixing portion and the sash frame portion in the vicinity thereof can be reinforced to improve the rigidity of the sash frame 2.

  In the above-described embodiment, the sash frame 2 is fixed to the housing 4 by welding. However, the fixing method is not limited to welding. In an embodiment, the sash frame 2 may be fixed to the housing 4 by any non-welding method such as screwing or bonding. In this case, the frame fixing part 11 and the frame fixing tool 30 are configured to match the construction method.

  In the above-described embodiment, the reinforcing metal fitting 10 is formed of a material different from the sash frame 2, for example, a material having higher strength than the sash frame 2 in a high temperature environment. However, the reinforcing bracket 10 may be formed of the same material as the sash frame 2, for example, an aluminum material. Even in this case, the rigidity of the sash frame 2 can be improved. This is particularly effective when the closed cross section is formed by the reinforcing metal fitting 10 and the sash frame 2 as described above.

  In the above-described embodiment, the reinforcing metal fitting 10 is provided in each component of the sash frame 2, that is, the upper frame 2a, the lower frame 2b, the right vertical frame 2c, and the left vertical frame 2d. However, it is not essential that the reinforcing bracket 10 is provided on all of the upper, lower, left and right sides of the sash frame 2 as described above. The reinforcing bracket 10 includes the upper frame 2a, the lower frame 2b, the right vertical frame 2c, and the left vertical frame. It may be provided in at least one of 2d.

  2 sash frame, 2a upper frame, 2c right vertical frame, 4 frame, 5 rebar, 10 reinforcing bracket, 11 frame fixing part, 12 sash frame reinforcing material, 20 claw part, 22 fixing screw, 24 folding piece, 30 frame fixing tool .

Claims (1)

A sash frame,
In order to fix the sash frame to the housing, at least two housing fixing portions mounted on the housing side of the sash frame with a distance in the longitudinal direction of the sash frame;
A sash frame reinforcing member that is mounted on the housing side of the sash frame and extends along the longitudinal direction of the sash frame over a length range that includes a mounting position of each of the at least two housing fixing portions on the sash frame; equipped with a,
The sash frame has an open cross section in a plane perpendicular to its longitudinal direction, and forms a closed cross section with the sash frame and the sash frame reinforcement on the housing side of the sash frame,
The housing fixing part is a separate member from the sash frame reinforcing material,
As the claw portion of the sash frame and the skeleton fixing portion and the sash frame reinforcement is held, Rukoto the skeleton fixed portion by a fixing screw that is tightened from the skeleton side is attached to the sash frame reinforcement The sash frame features a dry storage structure.

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