JP2023152106A - sash - Google Patents

Abstract

To provide a sash having both usability and heat insulation in a compatible manner.SOLUTION: A sash 100 includes a rectangular window frame 8, and a sash S fitted inside a ring of the window frame 8 and having a face material G for partitioning an indoor side and an outdoor side. The sash S includes an outer sash 1 and an inner sash U arranged on the indoor side in the depth direction of the window frame 8 rather than the outer sash 1, the inner sash U has the plurality of face materials G overlapping in the depth direction, and the number of the face materials G of the inner sash U is larger than the number of the face materials G of the outer sash.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sash.

Patent Document 1 describes a fitting (an example of a sash). This fitting is composed of a window frame, and a fixed shoji and a movable shoji that are attached to the window frame. With this fitting, in order to improve the airtightness of the single sliding window as a whole, the upper stile of the fixed shoji is attached to a specific wall in either the outer shoji storage frame section or the inner shoji storage frame section to which the fixed shoji is attached to the window frame. , a band-like piece serving as an airtight means is interposed between specific walls of the lower stile and the door stile.

Patent Document 2 describes a double sash. A double sash is provided at an opening in a wall of a building, and includes an external window located on the outdoor side and an internal window located on the indoor side.

Japanese Patent Application Publication No. 2019-178547 JP 2019-120089 Publication

Merely improving the airtightness or heat insulation of conventional sashes (single-layer sashes) may not provide sufficient window insulation. In order to improve the insulation of the window, if an inner window is installed to create a so-called double sash, for example, when you want to go in or out or open the window, you have to open the outer window and the inner window, which takes time and effort. Usability is impaired. Further, when closing an open sash, the outer and inner windows must be closed in order to maintain airtightness and heat insulation, which is time-consuming and impairs usability. Therefore, it is desired that the sash be both easy to use and have good heat insulation properties.

The present invention was made in view of the above circumstances, and its purpose is to provide a sash that is both easy to use and has good heat insulation properties.

The sash according to the present invention for achieving the above object includes:
rectangular window frame,
A shoji that is fitted inside the ring of the window frame and has a face material that partitions an indoor side and an outdoor side,
The shoji is
Outside shoji and
an inner shoji placed on the indoor side in the direction in which the window frame is viewed than the outer shoji;
The inner shoji has a plurality of the facing materials that overlap in the prospective direction,
The number of the facing materials that the inner shoji has is greater than the number of the facing materials that the outer shoji has.

The sash according to the present invention is
The inner shoji is
a first inner shoji adjacent to the outer shoji in the prospective direction;
a second inner shoji arranged on the indoor side in the prospective direction than the first inner shoji;
The number of the surface materials that the first inner shoji and the second inner shoji have may be greater than the number of the surface materials that the outer shoji has.

The sash according to the present invention is
The outer shoji, the first inner shoji, and the second inner shoji each have a matching frame,
In a state in which the outer shoji, the first inner shoji, and the second inner shoji are closed, the matching frames may overlap in the prospective direction.

The sash according to the present invention is
The second inner shoji may be fixed to the window frame.

The sash according to the present invention is
The first inner shoji may be fixed to the window frame.

It is possible to provide a sash that is both easy to use and has good heat insulation properties.

It is a figure which looked at the sash of a first embodiment from the outdoor side. It is a sectional view (II-II arrow sectional view of FIG. 1) of the sash of the first embodiment when viewed from above. 3 is a sectional view taken along the line III-III in FIG. 2. FIG. FIG. 7 is a cross-sectional view of the sash of the second embodiment when viewed from above. It is a cross-sectional view of the sash of the second embodiment when viewed from above, and is a diagram when the second inner shoji is slid.

The sash described below is employed as one of the building materials of buildings such as multi-story houses having steel frames, for example. Buildings that use the sashes described below have a reinforced concrete foundation, a frame structure made up of frame members such as columns and beams, and panels that form walls and floors, and are fixed to the foundation. and an upper structure. The frame members and panels can be standardized in advance. In this case, the frame members and the like can be manufactured in advance at a factory and transported to the construction site to assemble the building.

Hereinafter, a sash according to an embodiment of the present invention will be described based on the drawings.

(First embodiment)
(Explanation of overview)
FIG. 1 shows a sash 100 according to this embodiment. FIG. 2 shows a cross-sectional view of the sash 100 when viewed from above (cross-sectional view taken along the line II-II in FIG. 1).

As shown in FIGS. 1 and 2, the sash 100 includes a rectangular window frame 8 and a shoji S having a face material G that is fitted inside the ring of the window frame 8 and partitions an indoor side and an outdoor side. , is equipped with.

The shoji S includes an outer shoji 1 and an inner shoji U arranged on the indoor side in the direction of the window frame 8 than the outer shoji 1.

The inner shoji U has a plurality of facing materials G that overlap in the viewing direction, and the number of facing materials G that the inner shoji U has is greater than the number of facing materials G that the outer shoji 1 has.

(Detailed explanation)
FIG. 2 shows a cross section of the sash 100 installed in the building T when viewed from above in the vertical direction, that is, when viewed from above. FIG. 3 shows a cross-sectional view taken along the line III-III in FIG. As described above, the sash 100 includes the window frame 8 and the shoji S fitted into the window frame 8. The shoji S includes an outer shoji 1 and an inner shoji U. The sash 100 may be, for example, a resin-aluminum composite sash.

In the following description, the direction in which the window frame 8 is viewed may be simply referred to as the direction in which it is viewed. The direction of view is the same as the direction of the indoor side and the outside (outdoor side) divided by the sash 100. Further, the direction or position of the indoor side in the direction of view may be simply referred to as the indoor side, and the direction or position of the outdoor side in the direction of view may be simply referred to as the outdoor side.

In addition, the direction perpendicular to the perspective direction and the vertical direction, that is, the direction of sight, is referred to as the width direction. The sash 100 side is referred to as the inner side in the width direction. To describe only the sash 100, the window frame 8 side in the width direction (finding direction) when viewed from the sash S is the outside in the width direction, and vice versa, the shoji S side when viewed from the window frame 8 is the inside in the width direction.

The window frame 8 is a framework for attaching the shoji S to an opening H formed in the wall of the building T. The window frame 8 is formed as a rectangular frame. As shown in FIG. 2, the window frame 8 may be formed by combining a plurality of members. FIG. 2 shows a case where the window frame 8 is fixed to the inner circumference of an opening H formed in a wall of a building T. The window frame 8 includes, for example, a rectangular and annular first outer frame 81, a second outer frame 82 disposed on the indoor side of the first outer frame 81, and a second outer frame 82 supported by the second outer frame 82. It may also have three outer frames 83. The interior side of the window frame 8 in the inner circumference of the opening H is covered with an interior material 9 such as a plate, for example. The window frame 8 may be made of an aluminum material, or may be an aluminum resin composite material made of an aluminum skeleton and a resin outer layer. The window frame 8 may be solid or hollow inside.

Rails 71 and 72 are formed in the upper and lower frame portions of the window frame 8 along the width direction. The rail 72 is arranged closer to the indoor side than the rail 71.

The shoji S is fitted inside the ring of the window frame 8 and partitions the indoor side and the outdoor side. The shoji S includes an outer shoji 1 and an inner shoji U arranged on the indoor side in the direction of the window frame 8 than the outer shoji 1.

The inner shoji U includes, for example, a first inner shoji 2 adjacent to the outer shoji 1 in the perspective direction, and a second inner shoji 3 arranged on the indoor side in the perspective direction than the first inner shoji 2. .
As will be described later, the sash 100 is a double-sliding sash in which, for example, when the outer shoji 1 is opened, the outer sash 1 overlaps the inner shoji U in the perspective direction.

The shoji S, that is, the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 each have a face material G such as a glass plate. Moreover, the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 are each arranged on the outer periphery of the facing material G, fixing the facing material G, and each has a frame that is fitted into the window frame 8. In this embodiment, the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 each have two face materials G fixed to the respective frames 10, 20, and 30. The frames 10, 20, and 30 may be made of an aluminum material, or may be an aluminum resin composite material made of an aluminum skeleton and a resin outer layer. The inside of the frames 10, 20, 30 may be solid or hollow.

As described above, the outer shoji 1 includes two face materials G and a frame 10 that fixes these and is fitted into the window frame 8.

As shown in FIGS. 2 and 3, the outer shoji 1 has door rollers (not shown) provided on the upper and lower side frames 13, 14 (see FIG. 3), etc., engaged with the rails 71. It is fitted into the window frame 8.

In FIG. 2, when the outer shoji 1 is closed, the vertical stile of the outer shoji 1 on the door stop side of the stile 10 (the vertical stile on the left side surface) is the door stop stile 11, and the width direction The inner stiles are shown as stile 12.

The outer shoji 1 is guided by rails 71 and is slidable in the width direction. When the outside shoji 1 is in the closed state shown in FIG. 2, the doorstop stile 11, which is a vertical stile on the left-hand side surface, acts as a doorstop when the outside of the room is viewed from inside the room. In the following explanation, when explaining the left and right sides of the sash 100, the side of the outer shoji 1 in the width direction when viewed from the inner shoji U and the side that has the same positional relationship as this will be explained as the left side, and the side in the width direction when viewed from the outer shoji 1. The side of the inner shoji U and the side that is in the same positional relationship as this may be described as the right side. In this embodiment, the term "door stopper" refers to a state in which either the left or right vertical stile of the shoji S is in contact with or closest to the vertical frame of the window frame 8.

Between the two face materials G of the outer shoji 1, an air layer is formed in which air circulation and movement are suppressed. In the outer shoji 1, the air layer between the two facing sheets G of the outer shoji 1 suppresses the transfer of heat between the indoor side and the outdoor side via the outer shoji 1 in the viewing direction, and the sash 100 Improves insulation performance.

As described above, the second inner shoji 3 includes the two face materials G and the frame 30 that fixes these and is fitted into the window frame 8.

As shown in FIGS. 2 and 3, the second inner shoji 3 has upper and lower horizontal frames 33 (see FIG. 3) and horizontal frames 34 attached to the window frame 8 (for example, the second outer frame 82 and the third outer frame 88). It is fixed to the window frame 8 in a fitted state. The second inner shoji 3 is a so-called FIX window that is fixed so as not to slide relative to the window frame 8. The second inner shoji 3 may be fitted into the window frame 8, for example, in the Kendon style.

In FIG. 2, the vertical stile on the side of the second inner shoji 3 in the stile 30 that is the door stop (the vertical stile on the right side) is the door stop stile 31, and the vertical stile on the inside of the door stop 31 in the width direction is It is shown as meeting frame 32. In the second inner shoji 3, when looking outside from the room, the door stop stile 31, which is a vertical stile on the right hand side, serves as a door stop. That is, in this embodiment, the second inner shoji 3 is fixed to the window frame 8 in a closed state with the door stop stile 31 against the door stop. Below, the state in which the second inner shoji 3 is closed with the door stop stile 31 being a stop may be referred to as a first closed state.

An air layer is formed between the two face materials G of the second inner shoji 3 in which air circulation and movement are suppressed. In the second inner shoji 3, the air layer between the two panels G of the second inner shoji 3 prevents the transfer of heat between the indoor side and the outdoor side via the second inner shoji 3 in the forward direction. As a result, the heat insulation performance of the sash 100 is improved.

As described above, the first inner shoji 2 includes the two face materials G and the frame 20 that fixes these and is fitted into the window frame 8.

As shown in FIGS. 2 and 3, the first inner shoji 2 has a window frame 8 with door rollers (not shown) provided on the upper and lower side frames 23, 24, etc. engaged with the rail 72. is embedded in.

In FIG. 2, the vertical stile on the door stop side of the first inner shoji 2 in the stile 20 (the vertical stile on the right side part) is combined with the door stop stile 21, and the vertical stile on the inside widthwise of the door stop stile 21. It is shown as frame 22. When the first inner shoji 2 is in a closed state, the door stop stile 21, which is a vertical stile on the right-hand side surface, hits the door when looking outside from the room.

Between the two face materials G of the first inner shoji 2, an air layer is formed in which air circulation and movement are suppressed. In the first inner shoji 2, the air layer between the two facing sheets G of the first inner shoji 2 prevents the transfer of heat between the indoor side and the outdoor side via the first inner shoji 2 in the forward direction. As a result, the heat insulation performance of the sash 100 is improved.

The first inner shoji 2 may be slidable in the width direction relative to the window frame 8 while being guided by the rails 72, or may be directly fixed to the window frame 8 or engaged with the second inner shoji 3. Therefore, it may be fixed to the window frame 8 via the second inner shoji 3 to form a FIX window. In this embodiment, a case where the first inner shoji 2 is a FIX window will be described below as an example.

When the outer shoji 1 is closed, that is, when the doorstop stile 11 of the outer shoji 1 is in contact with the window frame 8, the interlocking stile 12, 22, and 32 overlap in the perspective direction. Although not shown, a tight material may be placed between the matching stile 12 of the outer shoji 1 and the matching stile 22 of the first inner shoji 2.

In this embodiment, as shown in FIG. 2, the connecting frame 22 is supported by the connecting frame 32 between the connecting frame 22 of the first inner shoji 2 and the connecting frame 32 of the second inner shoji 3. In addition, a spacer 41 is disposed to make the space between the matching frame 22 and the matching frame 32 airtight and heat insulating. The spacer 41 may be arranged along the extending direction of the joining frames 22 and 32. The spacer 41 may be fixed to the matching frame 32, for example. It is preferable that the tip of the spacer 41 on the outdoor side lightly contacts the joint frame 22 as a whole in the extending direction of the joint frame 22.

The functionality of the sash 100 will be explained below.

As described above, in the sash 100, at least the outer shoji 1 can be slid in the width direction. When the outer shoji 1 is closed, that is, when the doorstop stile 11 of the outer shoji 1 is in contact with the window frame 8, the interlocking stile 12, 22, and 32 overlap in the perspective direction. Therefore, when force is applied to the connecting frames 12 and 22 from the outdoor side to the indoor side, the connecting frame 32 of the second inner shoji 3 fixed to the window frame 8 moves the connecting frame 22 from the indoor side. It becomes possible to support it. In addition, the matching stile 32 can support the matching stile 12 from the indoor side via the matching stile 22. This improves the strength of the sash 100 against loads applied to the sash 100 from the outdoor side to the indoor side due to pressure differences, strong winds, and the like. In addition, in FIG. 2, the case where each center in the width direction of the meeting frames 12, 22, and 32 overlaps in the viewing direction is illustrated and shown. A center line C shown in FIG. 2 is a line passing through the centers of the matching frames 12, 22, 32 in the width direction.

When the spacer 41 is arranged between the matching stile 22 of the first inner shoji 2 and the matching stile 32 of the second inner shoji 3 as in this embodiment, the joining stile 22 is strongly supported by the matching stile 32. It is preferable because it becomes It is preferable that the spacer 41 has a suitable width in the width direction and that the spacer 41 makes a moderately light surface contact with the connecting frame 22, since this will further strengthen the support of the connecting frame 22 by the connecting frame 32. In addition, by having the spacer 41 come into contact with the connecting frame 22 moderately and lightly, the shaking of the connecting frame 22 can be prevented when force is applied to the first inner shoji 2 due to pressure fluctuations on the indoor side or the outdoor side. Can be suppressed.

The width of the spacer 41 in the width direction is preferably 1/2 or less (in this embodiment, 1/3) of the width of the joining frame 22. By appropriately narrowing the width of the spacer 41 in the width direction, it is possible to suppress heat conduction between the interlocking stile 22 and the interlocking stile 32 via the spacer 41, thereby avoiding a decrease in the heat insulation properties of the sash 100. .

Since the second inner shoji 3 is fixed, regardless of whether the first inner shoji 2 is a FIX window, the first inner shoji 2 is in the closed state, that is, the door stop frame of the first inner shoji 2 is 21 is in contact with the window frame 8, the first inner shoji 2 and the second inner shoji 3 overlap in the forward direction. As a result, an air layer is formed between the first inner shoji 2 and the second inner shoji 3 in which air flow and movement are suppressed, and this air layer creates a space between the first inner shoji 2 and the second inner shoji 3 in the direction of view. Transfer of heat between the indoor side and the outdoor side via the double shoji 3 is suppressed, and the heat insulation performance of the sash 100 is improved.

In addition, the total number of facing materials G possessed by the first inner shoji 2 and the second inner shoji 3, that is, the number of facing materials G possessed by the inner shoji U is 4, and the number of facing materials G possessed by the outer shoji 1 is 4. (2). Therefore, compared to the side of the outer shoji 1 in the sash 100, on the inner shoji U side, between the two facing materials G of the first inner shoji 2 and between the two facing materials G of the second inner shoji 3. Air layers are formed between the two, and these two air layers further suppress the transfer of heat between the indoor side and the outdoor side via the first inner shoji 2 and the second inner shoji 3 in the forward direction. It has become so. This improves the heat insulation performance of the sash 100 as a whole.

Since only the outer shoji 1 is disposed on the left side of the sash 100, the sash 100 can be opened and closed by opening only the outer shoji 1, making it easy to use. On the other hand, in the case of double sliding sashes that have an outer window and an inner window, no matter which side is opened, the shoji of the inner window and the shoji of the outer window must be opened. It's a hassle.

In this way, the sash 100 can achieve a good balance between ease of use when opening and closing the sash 100 and heat insulation properties when the sash 100 is closed.

(Second embodiment)
In the first embodiment described above, the second inner shoji 3 is a FIX window, but in the second embodiment, the second inner shoji 3 is not a FIX window but can be slid in the width direction. Other aspects are generally the same. Hereinafter, with reference to FIGS. 4 and 5, differences from the first embodiment will be mainly explained, and explanations of common parts will be omitted as appropriate.

In addition to the rails 71 and 72, a rail 73 may be formed in the upper and lower frame portions of the window frame 8 along the width direction. The rail 73 is arranged closer to the indoor side than the rail 72.

The second inner shoji 3 is guided by the rails 73 and slides in the width direction with the upper and lower horizontal frames 33, 34 (see FIG. 3) fitted into the window frame 8 (for example, the second outer frame 82). It is considered possible. The second inner shoji 3 may be guided by the rails 73 by providing door rollers on the side frames 33, 34, etc.

The second internal shoji 3 can be in a closed state with the doorstop stile 31 serving as a doorstop (see FIG. 4), or in a closed state with the doorstop stile 32 serving as a doorstop (see FIG. 5). Below, the state in which the doorstop stile 31 is closed as a doorstop (see FIG. 4) may be referred to as a first closed state. Further, the state in which the door frame 32 is closed as a doorstop (see FIG. 5) may be referred to as a second closed state. In the second closed state, the doorstop stile 31 overlaps the doorstop stile 22 in the perspective direction.

The first inner shoji 2 is guided by a rail 72 and is slidable in the width direction with respect to the window frame 8.

In this embodiment, as shown in FIG. 4 and FIG. A tight material 42 is placed for airtightness and heat insulation of the space. The tight material 42 may be fixed and installed on the meeting frame 22. The tight material 42 may be arranged along the extending direction of the matching frame 22.

In this embodiment, it is sufficient that the tip of the tight member 42 on the indoor side lightly touches the joining frame 32 in the first closed state. Further, it is sufficient that the tip of the tight member 42 on the indoor side lightly touches the door stop stile 31 in the second closed state. By installing the tight material 42 in this way, when the first inner shoji 2 or the second inner shoji 3 slides, an increase in the frictional resistance between the tight material 42 and the second inner shoji 3 is suppressed, and the It becomes easier to slide the first shoji 2 or the second shoji 3.

As shown in FIG. 4, the door frames 21 and 31 of the first inner shoji 2 and the second inner shoji 3 are brought into contact with the window frame 8, that is, the first inner shoji 2 is closed and the second inner shoji 3 is closed. When the inner shoji 3 is in the first closed state, the heat insulation properties of the sash 100 are maintained as in the first embodiment. Furthermore, the sash 100 can be opened and closed by opening only the outer shoji 1, making it convenient to use. Particularly when the sash 100 is used as a window, it is easy to get in and out of the sash 100, and it is convenient to use.

On the other hand, as shown in FIG. 5, when the first inner shoji 2 is closed and the second inner shoji 3 is in the second closed state, unlike the case of the first embodiment, the outer shoji 1 and the second inner shoji Transfer of heat between the indoor side and the outdoor side via the shoji 3 is suppressed, and the heat insulation performance of the sash 100 is improved.

In addition, when the first inner shoji 2 is closed and the second inner shoji 3 is in the second closed state, the part on the outdoor side and the left side of the second outer frame 82 (in the width direction, the second inner shoji 3 or the part on the left side of the second inner shoji 3) is insulated in the space between the outer shoji 1, the second inner shoji 3, and the matching stile 22 of the first inner shoji 2. As a result, the movement of heat due to heat conduction through the outdoor side portion and the left side portion of the second outer frame 82 is suppressed, and the heat insulation is improved. In addition, when the first inner shoji 2 is closed, the outdoor side part and right side part of the second outer frame 82 is insulated by the door stop stile 31 and the upper and lower horizontal stile 33, 34 of the first inner shoji 2. Ru.

In the sash 100, in the first closed state of the second inner shoji 3, when the influence of heat conduction through the outdoor side portion and left side portion of the second outer frame 82 on the reduction in insulation properties is relatively large. It is preferable to put the second inner shoji 3 in the second closed state as necessary, because it is possible to suppress a decrease in the heat insulation properties of the sash 100 as a whole. For example, at times when you want to keep the sash 100 closed for a long time, for example, at night when you don't frequently go in and out of the sash 100 and for security reasons, you want to keep the sash 100 closed, the second inner shoji 3 is used. By setting it in the second closed state, it is possible to achieve both the usability of the sash 100 on a daily basis and the improvement of the heat insulation properties of the sash 100.

As described above, the sash according to this embodiment can achieve both ease of use and heat insulation.

[Another embodiment]
(1) In the above embodiment, the case was explained in which the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 each have two side materials G fixed to the respective frames 10, 20, and 30. . However, the number of facing materials G that the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 have is not limited to two. It may be one piece, or it may be three or more pieces.

(2) In the above embodiment, the case was explained in which the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 each have two side materials G fixed to the respective frames 10, 20, and 30. . However, the number of facing materials G that the outer shoji 1, the first inner shoji 2, and the second inner shoji 3 have does not need to be the same in each of the outer shoji 1, the first inner shoji 2, and the second inner shoji 3. do not have. For example, the second inner shoji 3 may have only one face material G.

(3) In the above embodiment, the shoji S includes the outer shoji 1 and the inner shoji U, and the inner shoji U includes the first inner shoji 2 and the second inner shoji 3. In addition, the number of facing materials G that the inner shoji U has is greater than the number of facing materials G that the outer shoji 1 has, and as an example, the total number of facing materials G that the first inner shoji 2 and the second inner shoji 3 have. It has been explained that the number of facing materials G that the inner shoji U has is four, which is greater than the number of facing materials G that the outer shoji 1 has (two).

However, the inner shoji U may be only the first inner shoji 2. In this case, it is sufficient that the number of facing materials G that the first inner shoji 2 has is greater than the number of facing materials G that the outer shoji 1 has. For example, let us assume that the number of facing materials G that the first inner shoji 2 has is 3, and the number of facing materials G that the first inner shoji 2 as the inner shoji U has is equal to the number of facing materials G that the outer shoji 1 has (2 sheets). ) can be more than

Note that the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction, and The embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the purpose of the present invention.

The present invention can be applied to sashes.

1: Outer shoji 10: Stile 100: Sash 11: Doorstop stile 12: Matching stile 13: Horizontal stile 14: Horizontal stile 2: First inner shoji 20: Stile 21: Doorstop stile 22: Matching stile 23: Horizontal Stile 24: Side stile 3: Second inner shoji 30: Stile 31: Doorstop stile 32: Combined stile 33: Side stile 34: Side stile 41: Spacer 42: Tight material 71: Rail 72: Rail 73: Rail 8: Window frame 81: First outer frame 82: Second outer frame 83: Third outer frame 9: Interior material C: Center line G: Surface material S: Shoji T: Building U: Shoji

Claims (5)

rectangular window frame,
A shoji that is fitted inside the ring of the window frame and has a face material that partitions an indoor side and an outdoor side,
The shoji is
Outside shoji and
an inner shoji placed on the indoor side in the direction in which the window frame is viewed than the outer shoji;
The inner shoji has a plurality of the facing materials that overlap in the prospective direction,
A sash in which the number of the facing materials of the inner shoji is greater than the number of facing materials of the outer shoji. The inner shoji is
a first inner shoji adjacent to the outer shoji in the prospective direction;
a second inner shoji arranged on the indoor side in the prospective direction than the first inner shoji;
The sash according to claim 1, wherein the number of the face materials of the first inner shoji and the second inner shoji is greater than the number of the face materials of the outer shoji. The outer shoji, the first inner shoji, and the second inner shoji each have a matching frame,
3. The sash according to claim 2, wherein when the outer shoji, the first inner shoji, and the second inner shoji are closed, the matching frames overlap in the prospective direction. The sash according to claim 2 or 3, wherein the second inner shoji is fixed to the window frame. The sash according to claim 2 or 3, wherein the first inner shoji is fixed to the window frame.

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