JP4072509B2 - Lower frame flat sash - Google Patents

Description

  The present invention relates to a sash in which a shoji is movably stored in a frame body made of a synthetic resin upper and lower frame and left and right vertical frames. In particular, the lower frame is formed to be flat by eliminating unevenness on the sill surface of the lower frame as much as possible. It relates to a frame flat sash.

  2. Description of the Related Art Conventionally, a resin sash is known in which upper and lower frames and left and right vertical frames are made of synthetic resin, and a shoji is housed in a frame body formed by rectangular frames. Here, if the upper and lower ridges and the left and right vertical ridges constituting the shoji are also made of synthetic resin, the frame and the shoji can all be made of synthetic resin. Examples of such a resin sash include those described in Patent Document 1 and Patent Document 2.

In some resin sashes, the ruggedness on the upper surface of the lower frame is eliminated as much as possible, and the sill surface is formed to be substantially flat. For example, as shown in Patent Document 3. This resin-made lower frame flat sash has concave grooves for storing the lower arm of the shoji on the indoor and outdoor sides of the rail, and accommodates the groove for housing the lower arm of the indoor shoji and the lower arm of the outdoor shoji. The groove is separated by a protrusion, and the upper ends of the rail and the protrusion are substantially the same height as the floor surface on the indoor side and the outdoor side.
JP-A-8-240076 Japanese Patent Laid-Open No. 11-13342 JP-A-10-115152

  However, in the conventional synthetic resin lower frame flat sash, although the upper end of the rail and the upper end of the projection are substantially the same height, the concave groove width occupies a large proportion in the expected direction of the lower frame, There are few flat parts, and it is difficult to ensure sufficient strength.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a lower frame flat sash made of a synthetic resin and having as many flat portions as possible.

In order to solve the above-described problems, a lower frame flat sash according to the present invention is configured by forming a synthetic resin upper and lower frame and left and right vertical frames in a rectangular shape, and the upper and lower frames and left and right frames are formed on the frame. In the lower frame flat sash that can run the shoji composed of downpile freely,
The lower arm includes an indoor hanging portion and an outdoor hanging portion that are suspended from the lower end on the indoor side and the outdoor side, respectively, and the lower surface of the indoor hanging portion faces the upper surface of the lower frame, and the lower end portion of the outdoor hanging portion is formed on the interior side of the inside than the outside surface of the lower rail,
The lower frame forms a substantially flat sill surface with a rail portion on which the shoji runs , has a horizontal surface facing the lower surface of the indoor hanging portion on the indoor side of the rail portion, and on the outdoor side of the rail portion. An outdoor groove for accommodating the lower end portion of the outdoor hanging portion is provided in the longitudinal direction, and the outdoor side surface of the outdoor groove is located on the indoor side of the outdoor surface of the lower arm.

  In the lower frame flat sash according to the present invention, the sill surface includes base portions protruding from the lower frame on the indoor side and the outdoor side, respectively, and a rail member made of metal is attached to each of the base portions to guide the shoji. A rail is formed, the inner shoji is arranged on the rail on the indoor side, and the outer shoji is arranged on the rail on the outdoor side to constitute a sliding shoji.

  Further, in the lower frame flat sash according to the present invention, the sill surface is provided with an indoor flat surface on the indoor side of the rail for the inner shingles, and between the outdoor groove for the inner shingles and the rail for the outer shingles. Provided with an intermediate flat surface and an outdoor flat surface outside the outdoor groove for the above-mentioned shoji screen, the indoor flat surface, the intermediate flat surface, the outdoor flat surface, and the upper surfaces of the indoor and outdoor rails have substantially the same height. It is configured to be formed.

  Furthermore, in the lower frame flat sash according to the present invention, the indoor rail is substantially continuous with the indoor flat surface, and the outdoor rail is substantially continuous with the intermediate flat surface. It is configured as a feature.

  In the lower frame flat sash according to the present invention, the lower surface of the indoor hanging part and the lower end part of the outdoor hanging part respectively hold a watertight material, and the watertight material of the indoor hanging part is on the horizontal surface of the lower frame facing it. While abutting, the watertight material of the outdoor hanging part abuts on the outdoor groove.

  According to the lower frame flat sash according to the present invention, the lower surface of the indoor hanging part of the lower arm is opposed to the upper surface of the lower frame, and the lower frame has a horizontal surface facing the lower surface of the indoor hanging part. A flat surface can be widely formed in the lower frame. Further, the lower end portion of the outdoor hanging part is formed inside the outdoor surface of the lower heel, and the outdoor side surface of the outdoor groove formed in the lower frame is positioned on the indoor side of the outdoor side surface of the lower heel so that the lower frame While forming the outdoor groove of the small in the expected direction. Since the lower end portion of the lower collar that is housed in the outdoor groove of the lower frame is formed small in the expected direction, a flat surface can be widely formed in the synthetic resin lower frame. This makes it possible to provide a synthetic resin lower frame flat sash that is easy to pass in and out of the room and has sufficient strength.

  In addition, according to the lower frame flat sash according to the present invention, the rail member made of metal is attached to the base portion formed on the sill surface, so that the rail can have the strength to support the load when the shoji runs. .

  Furthermore, according to the lower frame flat sash according to the present invention, the lower frame flat sash includes an intermediate flat surface formed at substantially the same height as the upper surface of the rail, the indoor flat surface, and the outdoor flat surface. Can be wider.

  Furthermore, according to the lower frame flat sash according to the present invention, the indoor rail is substantially continuous with the indoor flat surface, and the outdoor rail is substantially continuous with the intermediate flat surface, Since the rails and flat surfaces whose upper surfaces are formed at substantially the same height are substantially continuous, the flat surface of the lower frame can be made into a series of surfaces, thus facilitating indoor and outdoor traffic. In addition, the strength can be increased.

  And according to the lower frame flat sash which concerns on this invention, infiltration of rain water etc. can be prevented by providing a watertight material in the lower end part of a lower rod, and contact | abutting to a horizontal surface and an outdoor groove | channel.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a lower frame flat sash according to the present embodiment, and FIG. 2 is a transverse sectional view of the lower frame flat sash. In each of these drawings, the lower frame flat sash in the present embodiment is synthesized in the resin frame 1 composed of the synthetic resin lower frame 10, the upper frame 20, and the vertical frames 30, 30 attached to the building opening. The inner lower child 2 and the outer peripheral child 3 in which the lower arm 40, the upper arm 50, and the vertical rods 60, 60 made of resin are assembled and the glass body 74 is accommodated are stored in a sliding manner, and the outer arm 3 The screen door 4 is placed outside the room.

  The lower frame 10, the upper frame 20, and the vertical frame 30 constituting the resin frame 1 are all formed in a hollow shape from a synthetic resin. Each of these end portions is formed in an inclined shape, and the resin frame body 1 is framed in a rectangular shape by abutting and welding the end portions.

  The lower collar 40, the upper collar 50, and the vertical collar 60 that constitute the inner and outer shojis 2 and 3 are all formed in a hollow shape from a synthetic resin. Further, the lower rod 40, the upper rod 50, and the vertical rod 60 are all formed so that the cross-sectional shapes thereof are substantially the same. The lower arm 40 has a reinforcing material 47 made of metal inside, and a wheel 72 is attached to the reinforcing material 47 so that the inner and outer shojis 2 and 3 can run freely. The upper rod 50 and the vertical rod 60 also have reinforcing members 51 and 65 made of metal, respectively.

  Each flange having the reinforcing members 47, 51, 65 is formed with an inclined end, and the ends are brought into contact with each other so as to hold the glass body 74. 3 is formed. Instead of welding the scissors, the scissors 2 and the shingles 3 may be formed by connecting the scissors by bolting.

  The lower frame flat sash according to the present invention is formed by forming the sill surface 11 of the lower frame 10 to be substantially flat. Therefore, the configuration of the lower frame 10 and the lower rod 40 traveling on the sill surface 11 will be described in more detail. FIG. 3 shows an enlarged view near the lower frame 10 of FIG.

  As shown in FIG. 3, the sill surface 11 is an upper surface of the lower frame 10, and includes an indoor side flat surface 11a, an intermediate flat surface 11b, and an outdoor side flat surface 11c as flat surfaces in order from the indoor side. Moreover, the rail parts 12 and 12 which allow the inner shoji 2 and the outer shoji 3 to run between the indoor flat surface 11a and the intermediate flat surface 11b and between the intermediate flat surface 11b and the outdoor flat surface 11c, respectively. Is formed.

  The indoor flat surface 11a, the intermediate flat surface 11b, the outdoor flat surface 11c, and the top surfaces of the rail portions 12 and 12 are formed to have substantially the same height, whereby the sill surface 11 is made substantially flat. . The indoor flat surface 11a and the upper surface of the indoor rail portion 12 are substantially continuous, and the intermediate flat surface 11b and the upper surface of the outdoor rail portion 12 are substantially continuous.

  In addition, an inner shroud chamber groove 13 is formed on the indoor side of the indoor flat surface 11a, and an inner shroud chamber outer groove 14 is formed between the indoor rail portion 12 and the intermediate flat surface 11b. Further, an outer door 16 is formed between the outdoor rail portion 12 and the outdoor flat surface 11c. The inner groove 14 and the outer groove 16 are used to guide the lower end of the lower arm 40 when the inner child 2 or the outer child 3 travels, and have a drain hole on the bottom surface or side surface. The rainwater entering the lower frame 10 is discharged to the outside.

  The rail portion 12 is configured by attaching a rail member 12b to a base portion 12a protruding upward from the height of the bottom surface of each groove in the lower frame 10. The base 12a is formed in a concave shape, and the rail member 12b is formed so as to be freely inserted into the base 12a. Moreover, the convex part 12c is formed in the upper surface of the rail member 12b, and the wheel 72 of the inner shoji 2 or the outer shoji 3 is placed on this convex part 12c so that it can run freely.

  The indoor side flat surface 11a is formed to have substantially the same height as the indoor floor surface. In the lower frame 10, an indoor side base portion 75 a that protrudes substantially the entire length in the longitudinal direction and is formed in a concave shape is provided on the indoor side of the base portion 12 a on the indoor side. A lower frame cover body 75 is detachably attached. The upper surface of the indoor side lower frame cover body 75 is formed to be substantially flat, and this upper surface becomes the indoor flat surface 11a. In addition, an indoor end piece 18 a having a hollow cross section is formed at the indoor side end of the lower frame 10. The indoor end piece 18a constitutes a side surface of the inner pouch indoor groove 13, and its upper end is formed to be substantially the same height as the indoor floor surface.

  The outdoor flat surface 11c is formed so as to have substantially the same height as the floor surface of a deck or the like provided on the outdoor side, and the lower portion thereof is hollow to form an outdoor hollow portion 18b. Moreover, the groove part 11d and the rail part 11e which guide the screen door 4 are all formed in the outdoor side flat surface 11c over the longitudinal direction substantially full length.

  Since the indoor side end portion and the outdoor side end portion of the lower frame 10 are respectively formed as the indoor end piece 18a and the outdoor hollow portion 18b having a hollow cross section, sufficient strength of the end portion to which a large force is easily applied is ensured. be able to. In particular, since the sash according to the present invention is a resin sash formed of a synthetic resin, it is a great merit to ensure strength.

  The intermediate flat surface 11b is configured by an upper surface of a lower frame cover body 70 that is detachably attached to the lower frame 10. The lower frame 10 is formed with a projecting intermediate base 19 extending over substantially the entire length in the longitudinal direction excluding the shoji summoning portion. The lower frame cover body 70 is detachable from the intermediate base 19. A mounting portion 70a is provided at the bottom. The lower frame cover body 70 is provided over substantially the entire length in the longitudinal direction excluding the part where the shoji is summoned. The upper surface of the lower frame cover body 70 is formed in a substantially flat shape to constitute the intermediate flat surface 11b of the lower frame 10.

  An airtight block 80 is provided at the summing portion of the inner and outer children 2 and 3. FIG. 4 shows a longitudinal sectional view of the vicinity of the lower frame 10 in the summing portion of the inner shy hand 2 and the outer hand shoji 3. FIG. 5 shows a perspective view of the hermetic block 80. As shown in these drawings, the airtight block 80 is a block-like member disposed in the summing space portion 19a formed by cutting out the intermediate base portion 19 at the summing portion, and the upper surface thereof is in the shoji 2 It contacts the outdoor lower end 46 of the lower heel 40 and a watertight material 73 provided on the indoor hanging portion 43 of the lower heel 40 of the external shoji 3.

  In addition, the airtight block 80 is made of a resin material, and the upper surface that comes into contact with the inner and outer shojis 2 and 3 is constituted by a fin-like portion 80a made of a soft material. The airtight block 80 can ensure airtightness and watertightness at the summoned portion by bringing the fin-shaped portion 80a into contact with the lower end of the summoned heel in a state where the inner and outer children 2 and 3 are closed. it can.

  The lower frame cover body 70 is provided from both end portions of the airtight block 80 to the vicinity of the end portion in the longitudinal direction of the lower frame 10. As a result, the two lower frame cover bodies 70 and 70 are respectively connected to the inner and outer obstacles 2 and 3 via the airtight block 80 disposed in the center in the longitudinal direction between the indoor and outdoor rail parts 12 and 12. Will be provided.

  Since the lower frame cover body 70 is attached to the intermediate base portion 19 of the lower frame 10 in an engaging manner, it can be easily attached and detached. The lower frame cover body 70 and the airtight block 80 are detachably attached to the lower frame 10 so that the sill surface 11 is formed substantially flat and the flat surface is formed as wide as possible. Since 11b can be removed, cleaning work can be facilitated. Further, since the indoor lower frame cover body 75 is similarly attached to the indoor base portion 75a in an engaging manner, it can be easily attached and detached, and the cleaning work can be facilitated.

  Next, the lower arm 40 that can run on the sill surface 11 will be described in detail. As shown in FIG. 3, both the inner shoji 2 and the outer shoji 3 include an indoor hanging portion 43 that hangs from the lower end on the indoor side of the lower heel 40, and an outdoor hanging portion that hangs from the lower end on the outdoor side of the lower heel 40. 44.

  The indoor hanging portion 43 has a lower surface opposed to a substantially flat horizontal surface of the sill surface 11 of the lower frame 10, and the outdoor hanging portion 44 is further suspended from the lower end of the indoor hanging portion 44 than the outdoor surface 42 of the lower rod 40. It has the outdoor side lower end part 46 arrange | positioned inside. In other words, the lower end portion of the outdoor hanging portion 44 is formed inside the outdoor surface 42 of the lower collar 40.

  The indoor hanging part 43 of the inner shoji 2 faces the indoor flat surface 11a formed as a horizontal plane, and the indoor hanging part 43 of the external shoji 3 faces the intermediate flat surface 11b formed as a horizontal plane. In addition, the outdoor lower end portion 46 of the inner shoji 2 is disposed in the inner shroud outer groove 14 and is guided when the inner shoji 2 travels. In addition, the outdoor lower end 46 of the shoji 3 is disposed in the outer shoji room outer groove 16 and is guided when the shoji 3 is traveling.

  In addition, both the inner shoji 2 and the outer shoji 3 are provided with a watertight material 73 on the lower surface of the indoor lower end 45, and the watertight material 73 provided on the indoor lower end 45 of the inner shoji 2 contacts the indoor flat surface 11a. The watertight material 73 provided in contact with the lower end 45 on the indoor side of the shoji 3 is in contact with the intermediate flat surface 11b. Further, in both the inner and outer children 2 and 3, the outdoor lower end 46 is provided with a watertight material 73 on the surface facing the rail portion 12, respectively. These watertight materials 73 prevent rainwater from entering from the outdoor side.

  Here, the outdoor side surface 14 a of the inner frame 14 of the lower frame 10 of the lower frame 10 is disposed on the indoor side of the outdoor surface 42 of the lower collar 40. Further, the outdoor side surface 16 a of the outer frame 16 of the outer frame 16 of the lower frame 10 is disposed on the indoor side with respect to the outdoor surface 42 of the lower collar 40. Therefore, the lower eyelid 40 is placed in each groove of the lower frame 10 as follows.

  The outdoor hanging portion 44 of the lower collar 40 in the inner shroud 2 has a lower surface 44a facing the intermediate flat surface 11b of the lower frame 10 and is further drooped indoors from the lower surface 44a, that is, on the inner side of the lower collar 40. The lower end portion 46 is received in the inner groove 14. In addition, the outdoor hanging portion 44 of the lower heel 40 in the external shoji 3 has a lower surface 44a facing the outdoor flat surface 11c of the lower frame 10 and is further suspended indoors from the lower surface 44a, that is, inside the lower heel 40. The lower end 46 of the outdoor side is accommodated in the outer groove 16 of the outer casing.

  As described above, the flat width of the sill surface 11 is provided to the inside of the outdoor surface 42 of the lower heel 40 by forming the width in the expected direction of the outdoor lower end 46 so small that the watertight material 73 can be held. And the flat surface of the sill surface 11 can be formed wider in the expected direction. Moreover, since the indoor hanging part 43 is formed so as to face the indoor flat surface 11a and the intermediate flat surface 11b which are horizontal surfaces, the horizontal surface can be provided on the sill surface 11 on the indoor side of the lower arm 40, The flat surface of the lower frame 10 can be formed wider.

  Since each cross-section is formed to have substantially the same cross-sectional shape, portions corresponding to the indoor hanging portion 43 and the outdoor hanging portion 44 of the lower rod 40 are also formed on the vertical rod 60 as shown in FIG. ing. Since the side surface of the vertical rod 60 serving as a summoning rod is exposed to the indoor side, the design of the sash is impaired as it is, and it is difficult to attach the crescent 62 provided on the side surface. Therefore, a side surface constituting member 61 is provided on the side surface corresponding to the indoor hanging portion 43 and the outdoor hanging portion 44 of the lower rod 40 of the vertical rod 60 so as to cover it.

  The side surface constituting member 61 substantially covers the side surface of the vertical rod 60 serving as the summoning rod over substantially the entire length in the longitudinal direction and forms a side surface to which the crescent 62 is attached in a flat shape. Mounted in a stop shape. In addition, the side surface component 61 is attached to both the inner and outer children 2 and 3.

  Further, a smoke return member 63 made of metal is provided from the side surface constituting member 61 to the opposing summing surfaces of the vertical hook 60. Each smoke return member 63, 63 provided in each of the inner shroud 2 and the outer shoji 3 is provided with a linkage portion 63a linked to each other. The linking part 63a is linked to each other in a superposed state in a state where the inner and outer shojis 2 and 3 are closed. When the smoke return member 63 is made of a synthetic resin, strong linkage cannot be made due to strength problems. However, by providing the smoke return member 63 made of metal, the strength of the linkage portion 63a is secured and strong. Can be linked. That is, airtightness can be improved.

  Next, the drainage structure of the lower frame flat sash in the present embodiment will be described. As the drainage structure, each groove of the lower frame 10 has a drainage hole, and the infiltrated water is guided to the hollow part 17 through the drainage hole, and is further discharged to the outside through the external drainage hole from the hollow part 17. Has been to be. FIG. 6 is a longitudinal sectional view of the vicinity of the lower frame showing the drainage structure, and FIG. 7 is a plan view of the lower frame 10 with the shoji removed.

  As shown in FIG. 6, a drain hole 13 b that penetrates the indoor lower frame cover body 75 and the indoor rail portion 12 is formed in the inner groove 13. Therefore, the water that has entered the inner shroud chamber groove 13 is guided to the outer shroud chamber outer groove 14 through the drain hole 13b. Further, a drainage hole 14 b is formed in the inner shroud outer groove 14 so as to penetrate the intermediate base portion 19 and guide water below the lower frame cover body 70. A drainage hole 19 b communicating with the hollow portion 17 of the lower frame 10 is formed below the intermediate base portion 19. Further, a drain hole 16b communicating with the hollow portion 17 of the lower frame 10 is formed on the bottom surface of the outer shroud chamber outer groove 16.

  As shown in FIG. 6, the hollow portion 17 of the lower frame 10 is divided into a plurality of regions, and the water guided to the region on the indoor side of the hollow portion 17 through the drainage hole 19b passes through the communication hole 17a. The water is guided to the region, and is guided to the hollow portion 71a of the lower frame reinforcing member 71 that reinforces the lower frame 10 through the communication hole 17b together with the water directly guided to the region through the drain hole 16b. The lower frame reinforcing member 71 includes an external drain hole 71b communicating with the outside, and the water guided to the hollow portion 71a is discharged to the outside through the external drain hole 71b.

  Here, the lower frame reinforcing member 71 is arranged below the lower frame 10 as shown in FIG. 6, and is fixed to the lower frame 10 by screwing and engagement. The lower frame reinforcing member 71 is made of an aluminum extruded mold formed in a hollow shape, has a function of reinforcing the lower frame 10 to which a large load is applied, and has the above-described external drain hole 71b, so that the hollow frame 71a is interposed. Rainwater that has entered the sash can be discharged to the outside.

  In this way, the lower frame reinforcing member 71 having the hollow portion 71a and the external drain hole 71b is disposed and fixed below the lower frame 10, so that the external drain hole is formed from the bottom surface of each groove formed in the sill surface 11. The height up to 71b can be increased, and even when a large amount of water has entered the sash, it is possible to make the sash highly water-tight so that the water level does not easily reach each groove of the sill surface 11. .

  In addition, an external drain hole 17c is formed in the outdoor side surface of the hollow portion 17, and the water guided to the hollow portion 17 is also discharged outside through the external drain hole 71b. Thus, by providing a plurality of external drain holes and dispersing the drainage, the water that has entered the sash can be drained efficiently.

  FIG. 7 shows a state in which the shoji is removed from FIG. As shown in the figure, a door stop stopper 81 is provided at the longitudinal end of the inner door groove 13, and a drain hole 13 b is formed below the door stopper 81. In addition, drainage holes 14b penetrating the intermediate base 19 are formed in the outer groove 14 of the inner shoji room in the vicinity of the end portion in the longitudinal direction and in the vicinity of the summoning portion. Furthermore, drain holes 19b formed below the lower frame cover body 70 are provided in the vicinity of the longitudinal direction end portion and the summing portion of the lower frame 10, respectively. Here, a check valve for preventing the backflow of water is attached to the drain hole 19b on the side of the outer shoji 3.

  In addition, drainage holes 16b are formed in the outer shroud chamber outer groove 16 in the vicinity of the end portion in the longitudinal direction and in the vicinity of the summoning portion, respectively. Furthermore, the external drain holes 17c and 71b are respectively provided in the vicinity of the end in the longitudinal direction of the side surface of the lower frame 10. These external drain holes 17c and 71b are also provided with check valves so that water does not flow back from the outside.

  Although the embodiment of the present invention has been described so far, the application of the present invention is not limited to this embodiment, and can be applied in various ways within the scope of its technical idea.

It is a longitudinal cross-sectional view of the lower frame flat sash in this embodiment. It is a cross-sectional view of the lower frame flat sash in this embodiment. It is a longitudinal cross-sectional view near the lower frame. It is a longitudinal cross-sectional view of the lower frame vicinity in the summoning part. It is a perspective view of a lower frame cover and an airtight block. It is a longitudinal cross-sectional view of the lower frame vicinity shown about the drainage structure. It is a figure of the state which removed the shoji in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin frame 2 Inner shoji 3 External shoji 10 Lower frame 11 Sill surface 11a Indoor side flat surface 11b Middle flat surface 11c Outdoor flat surface 12 Rail part 12a Base 13 Inner child indoor groove 14 Inner child room outer groove 16 External child room outer groove 17 hollow portion 18a indoor end piece 18b outdoor hollow portion 19 intermediate base portion 19a summing space portion 20 upper frame 30 vertical frame 40 lower rod 42 outdoor surface 43 indoor hanging portion 44 outdoor hanging portion 46 outdoor lower end portion 50 upper rod 60 vertical框 61 Side component member 63 Smoke return member 63a Linking part 70 Lower frame cover body 71 Lower frame reinforcing material 73 Watertight material 75 Indoor lower frame cover body 80 Airtight block

Claims (5)

A lower frame flat in which upper and lower frames made of synthetic resin and left and right vertical frames are framed in a rectangular shape, and a shoji composed of upper and lower rods and left and right vertical rods is movably stored in the frame. In the sash,
The lower arm includes an indoor hanging portion and an outdoor hanging portion that are suspended from the lower end on the indoor side and the outdoor side, respectively, and the lower surface of the indoor hanging portion faces the upper surface of the lower frame, and the lower end portion of the outdoor hanging portion is It is formed on the indoor side that is inside the outdoor surface of the lower arm ,
The lower frame forms a substantially flat sill surface with a rail portion on which the shoji runs , has a horizontal surface facing the lower surface of the indoor hanging portion on the indoor side of the rail portion, and on the outdoor side of the rail portion. A lower frame flat sash having an outdoor groove in a longitudinal direction for accommodating a lower end portion of the outdoor hanging part, and an outdoor side surface of the outdoor groove being located on an indoor side with respect to an outdoor surface of the lower arm.   The sill surface has base portions protruding from the lower frame on the indoor side and the outdoor side, respectively, and a rail member made of metal is attached to each of the base portions to form a rail for guiding the shoji. The lower frame flat sash according to claim 1, wherein a shoji is arranged by arranging a shoji and an outer shoji on the outdoor rail.   The sill surface is provided with an indoor flat surface on the indoor side of the rail for the inner shoji, and an intermediate flat surface is provided between the outdoor groove for the inner shoji and the rail for the outer shoji. The outdoor flat surface is provided outside the outdoor groove, and the indoor flat surface, the intermediate flat surface, the outdoor flat surface, and the upper surfaces of the indoor and outdoor rails are formed at substantially the same height. Bottom frame flat sash of description.   4. The lower frame flat sash according to claim 3, wherein the indoor rail is substantially continuous with the indoor flat surface, and the outdoor rail is substantially continuous with the intermediate flat surface. .   The lower surface of the indoor hanging part and the lower end of the outdoor hanging part respectively hold a watertight material, the watertight material of the indoor hanging part abuts against the horizontal surface of the lower frame facing it, and the watertight material of the outdoor hanging part is The lower frame flat sash according to any one of claims 1 to 4, wherein the lower frame flat sash is in contact with the outdoor groove.

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