Door and window frames

Abstract

To provide a fitting frame that can efficiently suppress heat transfer from the outside to the inside of a room.SOLUTION: The inventive fitting frame comprises a frame fixing portion 41 fixed to an outer wall 11 (frame), a sash facing portion 42 that is arranged to face the frame fixing portion 41 via a first hollow portion 321 (hollow portion) and faces the sash, a first rib 47 provided between the frame fixing portion 41 and the sash facing portion 42 and partitioning the first hollow portion 321 in the indoor / outdoor direction. The first rib 47 has an oblique portion 472 that gradually extends in an oblique direction from the sash facing portion 42 side toward the frame fixing portion 41 side toward the chamber 13 side.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to door frames. [Background technology]

[0002] In recent years, fittings such as sashes and doors are required to have high insulation performance to suppress the transfer of heat from the outside to the inside of the room. For this reason, there is a demand to ensure airtightness between the fitting frame (fitting frame) and the shoji screen, as well as to improve the insulation performance of the frame and the shoji frame. The fitting frame disclosed in Patent Document 1 is provided with ribs that separate the internal hollow space into the inside and outside of the room, and is configured to suppress the transfer of heat from the outside to the inside of the room. The fitting frame ribs disclosed in Patent Document 1 are provided so as to be parallel to the facing surface of the fitting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-196359 A Summary of the Invention [Problem to be solved by the invention]

[0004] When heat is transferred from the outside to the inside of a room through a door frame, it is easier for heat to be transferred to the side of the door frame that is fixed to the building's framework than to the opposite side, where the shoji screen is installed. Therefore, if the door frame's ribs are set parallel to the front surface of the door, the orientation of the ribs will not correspond to the temperature distribution inside the door frame, making it difficult to efficiently suppress the transfer of heat from the outside to the inside of the room.

[0005] The present disclosure aims to provide a door and window frame that can efficiently suppress the transfer of heat from the outside to the inside of a room. [Means for solving the problem]

[0006] In order to achieve the above object, the door frame according to the present disclosure has a body fixing part fixed to a body, a shoji facing part arranged opposite to the body fixing part via a hollow part and facing a shoji screen, and a first rib provided between the body fixing part and the shoji facing part and dividing the hollow part into indoor and outdoor directions, The shoji facing portion includes a first shoji facing plate portion extending diagonally toward the shoji side toward the interior side of the room, a second shoji facing plate portion extending toward the shoji side from the first shoji facing plate portion, a third shoji facing plate portion extending toward the interior side from the second shoji facing plate portion, a fourth shoji facing plate portion connected to the third shoji facing plate portion and facing the second shoji facing plate portion, a fifth shoji facing plate portion extending toward the interior side from the fourth shoji facing plate portion, and a sixth shoji facing plate portion extending toward the shoji side from a middle portion of the fifth shoji facing plate portion in the interior / exterior direction, the fifth shoji facing plate portion being located on the interior side of the room relative to the sixth shoji facing plate portion and having a thin plate portion having a thickness thinner than a portion on the exterior side of the sixth shoji facing plate portion, The first rib has an inclined portion that extends diagonally gradually toward the inside of the room from the shoji opposing portion toward the body fixing portion. [Brief description of the drawings]

[0007] [Figure 1] This is a front view of the fixture from the inside of the room. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 4] A cross-sectional view of the lower frame. [Diagram 5] A cross-sectional view of a lower frame according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] As shown in Figs. 1 to 3, the door frame 1 according to this embodiment is a frame for a door 2 provided in an opening 12 of an exterior wall 11 (building frame) that separates an interior 13 from an exterior 14. The door 2 according to this embodiment is a vertical sliding window. The door frame 1 is fixed to the exterior surface 111 of the building frame of the exterior wall 11. The structural part of the exterior wall 11 that supports the load of the building is the building frame, and the finishing material provided on the exterior side of the building frame is the exterior wall material 112. The exterior surface of the building frame is the exterior surface 111 of the building frame. A paper screen 21 is provided on the inside of the door frame 1. The door frame 1 has a shape that can be used even when the door 2 is a fixed window. The paper screen 21 has a frame 22 provided on the periphery and a surface material 23 such as a glass plate provided on the inside of the frame 22. The fitting 2 has a fitting frame 1 and a frame 22, and at least the fitting frame 1 is molded from a resin material.

[0009] In the following, the horizontal direction connecting the room 13 and the room 14 (the horizontal direction perpendicular to the exterior wall 11) is referred to as the indoor / outdoor direction (the direction of the arrow Y in the figure), and the horizontal direction perpendicular to the indoor / outdoor direction (the horizontal direction along the exterior wall 11) is referred to as the width direction (the direction of the arrow X in the figure). In the figure, the up / down direction is indicated by the arrow Z. For long members, the direction in which the member extends may be referred to as the "length direction." The surface that is parallel to the face material 23 of the shoji screen 21 may be referred to as the "visible surface." When the opening 12 is closed, the face material 23 of the shoji screen 21 is parallel to the surface of the exterior wall 11 facing the room 13 and the surface facing the exterior 14, and the exterior surface 111 of the building structure.

[0010] As shown in FIG. 1 to FIG. 3, the door frame 1 has an upper frame 31, a lower frame 32, and a pair of vertical frames 33, 34. The upper frame 31 and the lower frame 32 are shown in FIG. 2, and the pair of vertical frames 33, 34 are shown in FIG. 3. The upper frame 31, the lower frame 32, and the pair of vertical frames 33, 34 are each a long shaped member formed to have a substantially identical cross-sectional shape over the entire length direction. The upper frame 31 is provided along the upper edge 121 of the opening 12 in a posture extending in the width direction. The lower frame 32 is provided along the lower edge 122 of the opening 12 in a posture extending in the width direction. One vertical frame 33 is provided along the edge 123 on one side in the width direction of the opening 12 in a posture extending in the vertical direction. The other vertical frame 34 is provided along the edge 124 on the other side in the width direction of the opening 12 in a posture extending in the vertical direction. The door frame 1 is formed in a rectangular shape.

[0011] In this embodiment, the upper frame 31, the lower frame 32, and the pair of vertical frames 33, 34 have the same cross-sectional shape perpendicular to the length direction. The upper frame 31 and the lower frame 32 are arranged in a vertically symmetrical orientation, and one vertical frame 33 and the other vertical frame 34 are arranged in a widthwise symmetrical orientation. The upper frame 31, the lower frame 32, and the pair of vertical frames 33, 34 have both end faces in the length direction cut at an angle of 45° to the length direction. The upper frame 31 has both end faces in the length direction butted against the upper end faces of the pair of vertical frames 33, 34 and welded to them. The lower frame 32 has both end faces in the length direction butted against the lower end faces of the pair of vertical frames 33, 34 and welded to them.

[0012] As shown in Figures 2 and 4, the lower frame 32 has a frame fixing portion 41, a shoji-facing portion 42, an exterior portion 43, an interior portion 44, a fixing piece 45, an angle 46, a first rib 47, and a second rib 48. As shown in Figures 2 and 3, the parts of the upper frame 31 and the pair of vertical frames 33, 34 that correspond to the frame fixing portion 41, the shoji-facing portion 42, the exterior portion 43, the interior portion 44, the fixing piece 45, the angle 46, the first rib 47, and the second rib 48 of the lower frame 32 are denoted by the same reference numerals as those of the lower frame 32.

[0013] 4, the body fixing part 41 is formed in a flat plate shape and is disposed on the lower end surface 122a of the opening 12 with the plate surface being in a substantially horizontal plane. The lower end surface 122a of the opening 12 is a horizontal plane. The part of the body fixing part 41 on the indoor 13 side is located directly above the lower end surface 122a of the opening 12, and the part on the outdoor 14 side protrudes further toward the outdoor 14 side than the exterior wall 11.

[0014] The outdoor side portion 43 is formed in a flat plate shape and protrudes upward from the edge portion 41a on the outdoor side 14 of the frame fixing portion 41 with the plate surface parallel to the finder surface.

[0015] The indoor side part 44 has a first indoor side plate part 441 and a second indoor side plate part 442. The first indoor side plate part 441 is formed in a flat plate shape, and protrudes upward from the edge part 41b on the indoor side 13 side of the frame fixing part 41 with the plate surface parallel to the finder surface. The second indoor side plate part 442 is formed in a flat plate shape, and protrudes from the outdoor side 14 side from a slightly lower side of the upper end part 441a of the first indoor side plate part 441 with the plate surface in a horizontal plane. The angle 46 is formed in a flat plate shape, and protrudes from the middle part in the vertical direction of the first indoor side plate part 441 to the indoor side 13 side with the plate surface in a horizontal plane. A frame is provided on the indoor side 13 of the first indoor side plate part 441 and below the angle 46. In this embodiment, the angle 46 is provided on the lower frame 32, but the angle 46 may not be provided. The angle 46 may be molded integrally with the indoor side portion 44, or may be a separate part from the indoor side portion 44 and fixed to the indoor side portion 44 with adhesive, screws, or the like.

[0016] The fixing piece 45 is formed in a flat plate shape and protrudes downward from the middle part in the indoor / outdoor direction of the frame fixing part 41 with the plate surface parallel to the finding surface. The fixing piece 45 has a protrusion 451 protruding toward the room 13 side at both the lower end and the middle part in the up-down direction. The fixing piece 45 is arranged along the frame outer surface 111 of the exterior wall 11 and is fixed to the frame outer surface 111 from the outside room 14 side with screws or the like. The protrusion 451 of the fixing piece 45 comes into contact with the frame outer surface 111. An exterior wall material 112 or the like is provided on the outside room 14 side of the fixing piece 45.

[0017] The shoji-facing portion 42 is disposed above the frame fixing portion 41 with a gap therebetween. The shoji-facing portion 42 has a first shoji-facing plate portion 51, a second shoji-facing plate portion 52, a third shoji-facing plate portion 53, a fourth shoji-facing plate portion 54, a fifth shoji-facing plate portion 55, a sixth shoji-facing plate portion 56, and a seventh shoji-facing plate portion 57. The first shoji-facing plate portion 51 is formed in a flat plate shape. The first shoji-facing plate portion 51 has a plate surface that is slightly inclined with respect to the horizontal plane, and extends in an oblique direction gradually upward from the upper end portion 43a of the exterior side portion 43 toward the interior 13 side. The second shoji-facing plate portion 52 is formed in a flat plate shape and extends upward from the end portion 51a on the interior 13 side of the first shoji-facing plate portion 51 in an orientation in which the plate surface is parallel to the surface to be seen. The third shoji facing panel portion 53 is formed in a flat plate shape and extends from the vertical middle portion of the second shoji facing panel portion 52 toward the room 13 with the plate surface in a horizontal plane.

[0018] The fourth shoji-opposing plate portion 54 is formed in a flat plate shape and extends upward from the end portion 53a of the third shoji-opposing plate portion 53 on the room 13 side in a direction parallel to the surface of the sight. The second shoji-opposing plate portion 52 and the fourth shoji-opposing plate portion 54 face each other with a gap in the indoor / outdoor direction, and their respective upper ends 52a, 54a are arranged at the same height. The corner portion 58 formed by the third shoji-opposing plate portion 53 and the fourth shoji-opposing plate portion 54 is located on the room 14 side more than the fixed piece 45. The fifth shoji-opposing plate portion 55 is formed in a flat plate shape and extends from the upper end portion 54a of the fourth shoji-opposing plate portion 54 to the room 13 side in a position in which the plate surface is a horizontal plane. The end portion 55a of the fifth shoji-opposing plate portion 55 on the room 13 side is connected to the middle portion of the first indoor side plate portion 441 in the up-down direction. The fifth shoji-opposing plate portion 55 is located below the angle 46.

[0019] The sixth shoji facing plate portion 56 is formed in a flat plate shape, and extends upward from the middle part in the indoor / outdoor direction of the fifth shoji facing plate portion 55 with the plate surface parallel to the finding surface. The fifth shoji facing plate portion 55 is formed so that the part on the indoor 13 side of the sixth shoji facing plate portion 56 is thinner than the part on the outdoor 14 side.

[0020] The seventh shoji-opposing plate portion 57 is formed in a flat plate shape and extends from the upper end portion 56a of the sixth shoji-opposing plate portion 56 to the indoor 13 side with the plate surface in a horizontal plane. The end portion 57a ​​of the seventh shoji-opposing plate portion 57 on the indoor 13 side is connected to the middle portion of the first indoor side plate portion 441 in the up-down direction. The seventh shoji-opposing plate portion 57 is located above the angle 46. The seventh shoji-opposing plate portion 57 is disposed on the upper side of the fifth shoji-opposing plate portion 55 so as to face each other with a gap therebetween. The seventh shoji-opposing plate portion 57 is disposed on the lower side of the second indoor side plate portion 442 so as to face each other with a gap therebetween. The end portion 57b on the outdoor 14 side of the seventh shoji-opposing plate portion 57 and the end portion 442a on the outdoor 14 side of the second indoor side plate portion 442 have the same protruding length from the first indoor side plate portion 441 to the outdoor 14 side.

[0021] The lower frame 32 is formed with a first hollow portion 321 and a second hollow portion 322. The first hollow portion 321 is an empty portion surrounded by the frame fixing portion 41, the exterior portion 43, the first interior plate portion 441, and the first to fifth shoji-facing plate portions 51, 52, 53, 54, and 55. The second hollow portion 322 is an empty portion surrounded by the fifth to seventh shoji-facing plate portions 55, 56, and 57, and the first interior plate portion 441. The lower frame 32 is formed with a first rib 47 and a second rib 48 that further divide the first hollow portion 321.

[0022] The first rib 47 and the second rib 48 divide the first hollow portion 321 of the lower frame 32 into the indoor and outdoor directions. The first rib 47 is disposed closer to the outdoor portion 14 than the second rib 48. The first rib 47 and the second rib 48 have their lower ends 47a, 48a connected to the frame fixing portion 41 and their upper ends 47b, 48b connected to the shoji-facing portion 42.

[0023] The first rib 47 has a sight plate portion 471 that extends upward from the main frame fixing portion 41 to the vertical middle portion of the first hollow portion 321, and a diagonal portion 472 that extends diagonally from the upper end portion 471a of the sight plate portion 471 toward the outside 14 side. The sight plate portion 471 is formed in a flat plate shape and extends upward from the middle portion of the main frame fixing portion 41 in the indoor / outdoor direction with the plate surface parallel to the sight surface. The sight plate portion 471 is connected to a position directly above the fixing piece 45 in the main frame fixing portion 41. The sight plate portion 471 and the outdoor portion 43 are each formed with a water drain hole 323 that penetrates in the indoor / outdoor direction.

[0024] The inclined portion 472 is formed in a flat plate shape, and extends from the upper end 471a of the sight plate portion 471 to the shoji-facing portion 42 in an inclined position such that the plate surface is gradually inclined toward the outside 14 from the bottom to the top. The upper end 472a (upper end 47b of the first rib 47) of the inclined portion 472 is connected to the corner 58 formed by the third shoji-facing plate portion 53 and the fourth shoji-facing plate portion 54. In other words, the inclined portion 472 extends in an oblique direction gradually toward the inside of the room 13 from the corner 58 formed by the third shoji-facing plate portion 53 and the fourth shoji-facing plate portion 54 in the shoji-facing portion 42 downward.

[0025] The second rib 48 is formed in a flat plate shape and is arranged so that the plate surface is parallel to the finding surface. The second rib 48 has a lower end 48a connected to the middle part of the frame fixing part 41 in the indoor / outdoor direction, and an upper end 48b connected to a corner part 56b formed by the fifth shoji facing plate part 55 and the sixth shoji facing plate part 56 at the middle part of the fifth shoji facing plate part 55 in the indoor / outdoor direction. The second rib 48 is arranged directly below the sixth shoji facing plate part 56.

[0026] The first hollow portion 321 is divided into three spaces arranged in the indoor / outdoor direction by the first rib 47 and the second rib 48. The core material 324 (see FIG. 2) of the lower frame 32 can be placed in the middle space of the three spaces arranged in the indoor / outdoor direction. This space is surrounded by the frame fixing portion 41, the fifth shoji-facing plate portion 55, the first rib 47, and the second rib 48. The fifth shoji-facing plate portion 55 and the second rib 48 are each provided with a core material support claw portion 325 for supporting the core material 324.

[0027] The lower frame 32 is formed with a first groove 326 (groove) and a second groove 327. The airtight material 24 (see Figs. 2 and 3) is inserted into the second groove 327. When the shoji 21 is a fixed window, a pressing edge is inserted into the first groove 326. The first groove 326 is surrounded by the upper side of the second shoji facing plate 52, the third shoji facing plate 53, and the fourth shoji facing plate 54, and opens upward. The first rib 47 is connected to a corner 58 formed by the third shoji facing plate 53 and the fourth shoji facing plate 54 that form the first groove 326. The upper end 52a of the second shoji facing plate 52 and the upper end 54a of the fourth shoji facing plate 54 are formed with first claws 326a that protrude in the direction of approaching each other and stop the pressing edge.

[0028] The second groove portion 327 is surrounded by the upper side of the first indoor side plate portion 441, the second indoor side plate portion 442, and the seventh shoji facing plate portion 57, and opens to the outside 14 side. The end portion 57b on the outside 14 side of the seventh shoji facing plate portion 57 and the end portion 442a on the outside 14 side of the second indoor side plate portion 442 are formed with second claw portions 327a that protrude in directions approaching each other and are used to fasten the airtight material 24.

[0029] The upper frame 31, the lower frame 32 and the pair of vertical frames 33, 34 have the same cross-sectional shape perpendicular to the length direction. The upper frame 31 has a shape that is vertically symmetrical to the lower frame 32. The lower side of the pair of vertical frames 33, 34 is the side that is fixed to the frame body of each vertical frame, and the upper side of the lower frame 32 is the side on which the shoji screen 21 is placed of each vertical frame. For this reason, the shapes of the upper frame 31 and the pair of vertical frames 33, 34 will not be described. The upper frame 31 and the pair of vertical frames 33, 34 do not need to have the drainage holes 323 that are provided in the lower frame 32.

[0030] The first rib 47 of the door frame 1 has an inclined portion 472 that extends in an oblique direction gradually toward the room 13 from the shoji-facing portion 42 toward the frame fixing portion 41. In the transfer of heat from the outside 14 to the room 13 through the door frame 1, the side of the door frame 1 that is fixed to the building frame transfers heat more easily than the opposite side where the shoji 21 is provided. The side of the door frame 1 that is fixed to the building frame refers to the lower side in the vertical direction for the lower frame 32, the upper side in the vertical direction for the upper frame 31, and the side that is fixed to the frame in the width direction for the vertical frame. In other words, the lower part of the lower frame 32 transfers heat from the outside 14 to the room 13 more easily than the upper part, the upper part of the upper frame 31 transfers heat from the outside 14 to the room 13 more easily than the lower part, and the side of the vertical frame that is fixed to the frame in the width direction transfers heat more easily from the outside 14 to the room 13 than the side where the shoji 21 is provided. The diagonal portion 472 of the first rib 47 extends diagonally from the shoji-facing portion 42 toward the frame fixing portion 41, gradually moving toward the room 13, and thus has a shape that conforms to the temperature distribution inside the first hollow portion 321. Therefore, the door frame 1 according to this embodiment can efficiently suppress the transfer of heat from the outside 14 to the room 13.

[0031] In the door frame 1, two ribs, a first rib 47 and a second rib 48, are provided at an interval in the indoor / outdoor direction in the first hollow portion 321. This divides the first hollow portion 321 into three spaces, so that the transfer of heat from the outside 14 to the inside 13 of the first hollow portion 321 can be efficiently suppressed.

[0032] The first rib 47 of the fitting frame 1 has a sight plate portion 471. By adopting such a configuration, the water drainage hole 323 can be easily provided in the sight plate portion 471 in the bottom frame 32.

[0033] The first groove 326 to which the batten is attached is formed in the shoji-facing portion 42 of the door frame 1, and the first rib 47 is connected to the portion of the shoji-facing portion 42 where the first groove 326 is formed. When the batten is provided in the first groove 326, the batten is pushed into the first groove 326 by hitting it with a tool. Since the door frame 1 is provided with the first rib 47 connected to the shoji-facing portion 42 and the frame fixing portion 41, vibration generated when the batten is pushed into the first groove 326 can be transmitted to the frame (exterior wall 11) of the building via the first rib 47 and the frame fixing portion 41. Therefore, deformation of the door frame 1 caused by attaching the batten to the first groove 326 can be suppressed.

[0034] The first rib 47 of the door frame 1 is connected to a portion of the frame fixing part 41 to which the fixing piece 45 is connected. This allows the load transmitted from the first rib 47 to the frame fixing part 41 to be transmitted to the frame of the building from both the frame fixing part 41 and the fixing piece 45, and also allows the strength of the door frame 1 to be improved.

[0035] The present disclosure is not limited to the above-mentioned embodiment and can be modified as appropriate. For example, the door frame 1 in the above-mentioned embodiment is a vertical sliding window, and is configured to be usable as a door frame 1 for a fixed window. In contrast, the door frame 1 of the present disclosure may be a door frame 1 for a vertical sliding window or a window other than a fixed window.

[0036] In the above-mentioned fitting frame 1, two ribs, the first rib 47 and the second rib 48, are provided in the first hollow portion 321 with a gap between them in the indoor and outdoor direction. In contrast, the fitting frame 1 may be provided with only the first rib 47. As shown in FIG. 5, in addition to the first rib 47 and the second rib 48, a rib 59 may be provided on the outdoor side of the first rib 47 and the second rib 48. This rib 59 extends upward from the middle part in the indoor and outdoor direction of the frame fixing part 41 and is connected to the corner part 60 formed by the first shoji facing plate part 51 and the second shoji facing plate part 52. The rib 59 of the lower frame 32 is also provided with a water drainage hole 323. As long as the fitting frame 1 is provided with the first rib 47, the positions and number of other ribs may be appropriately set.

[0037] In the above-mentioned fitting frame 1, the first rib 47 has an inclined portion 472 whose plate surface is inclined, and a sight plate portion 471 whose plate surface is parallel to the sight surface. In contrast, the first rib 47 may be entirely the inclined portion 472, and may not have the sight plate portion 471.

[0038] In the above-mentioned fitting frame 1, the shoji-facing portion 42 is formed with a first groove portion 326 to which a batten is attached, and the first rib 47 is connected to the portion of the shoji-facing portion 42 where the first groove portion 326 is formed. In contrast, the shoji-facing portion 42 may not have the first groove portion 326 formed, and even if the first groove portion 326 is formed, the first rib 47 may not be connected to the portion of the shoji-facing portion 42 where the first groove portion 326 is formed. The position where the first rib 47 is formed may be set appropriately. When the first rib 47 is connected to the portion of the shoji-facing portion 42 where the first groove portion 326 is formed, the first rib 47 may be connected to a portion other than the corner portion 58 formed by the third shoji-facing plate portion 53 and the fourth shoji-facing plate portion 54.

[0039] In the door frame 1 according to the above embodiment, the first rib 47 is connected to a portion of the building frame fixing part 41 to which the fixing piece 45 is connected. In contrast, the fixing piece 45 may not be provided on the door frame 1. The portion of the first rib 47 connected to the building frame fixing part 41 may be a portion other than the portion to which the fixing piece 45 is connected. [Explanation of symbols]

[0040] 1 Door frame, 2 Door, 11 Exterior wall (structure), 14 Outside, 21 Shoji, 31 Upper frame, 32 Lower frame, 33, 34 Vertical frame, 41 Body fixing part, 42 Shoji facing part, 45 Fixing piece, 47 First rib, 48 Second rib, 321 First hollow part (hollow part), 326 First groove part, 471 Spot plate part, 472 Diagonal part

Claims

1. A body fixing part that is fixed to a body; A shoji facing portion that is arranged opposite the body fixing portion via a hollow portion and faces a shoji screen; A first rib is provided between the frame fixing portion and the shoji facing portion and divides the hollow portion into an indoor and outdoor direction. The shoji facing portion is A first shoji facing plate portion extending in a diagonal direction gradually toward the shoji side toward the interior side of the room; A second shoji facing plate portion extending from the first shoji facing plate portion toward the shoji side; A third shoji facing plate portion extending from the second shoji facing plate portion toward the indoor side; A fourth shoji facing plate portion connected to the third shoji facing plate portion and facing the second shoji facing plate portion; A fifth shoji facing plate portion extending from the fourth shoji facing plate portion to the indoor side; A sixth shoji facing plate portion extending from a middle portion of the fifth shoji facing plate portion in the indoor / outdoor direction to the shoji side, The fifth shoji facing plate portion is located on the indoor side of the sixth shoji facing plate portion and has a thin plate portion having a plate thickness thinner than a portion on the indoor side of the sixth shoji facing plate portion, The first rib is a door frame having a diagonal portion that extends gradually in a diagonal direction toward the inside of the room from the shoji opposing portion toward the main body fixing portion.

2. The door frame according to claim 1, further comprising a second rib arranged between the frame fixing portion and the shoji facing portion and spaced apart from the first rib in the indoor / outdoor direction, and dividing the hollow portion in the indoor / outdoor direction.

3. The door frame as described in claim 1 or 2, wherein the first rib is located closer to the main body fixing portion than the inclined portion and has a sight plate portion extending in a direction parallel to the sight surface from the shoji opposing portion side toward the main body fixing portion side.

4. A groove portion to which a batten is attached is formed in the shoji facing portion, The door frame according to any one of claims 1 to 3, wherein the first rib is connected to a portion of the shoji-facing portion in which the groove portion is formed.

5. A fixing piece is connected to the frame fixing portion, the fixing piece protruding from the frame fixing portion toward the frame and fixed to the frame, The door frame according to any one of claims 1 to 4, wherein the first rib is connected to a portion of the frame fixing part to which the fixing piece is connected.

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