JP4187675B2 - 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 easy to become an obstacle when passing indoors and outdoors, and it is difficult to secure sufficient strength of the sash.

  The present invention has been made to solve the above problems, and an object of the present invention 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 portion of the indoor hanging portion and the outdoor hanging portion is lower than the indoor surface and the outdoor surface of the lower arm, respectively. Formed inside,
The lower frame has a sill surface on which the shoji runs so as to be substantially flat, and has an indoor groove and an outdoor groove in the longitudinal direction for accommodating the lower ends of the indoor hanging part and the outdoor hanging part, respectively. The indoor side surface is located on the outer side of the lower heel indoor surface from the lower end to the upper end, and the outdoor side surface of the outdoor groove is located on the indoor side of the lower heel outdoor surface from the lower end to the upper end. It is configured as a feature.

  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 has an indoor flat surface on the indoor side of the indoor groove for the inner shingles, and the outdoor groove for the inner shingles and the indoor groove for the outer obstacles are provided. An intermediate flat surface is provided in between, and an outdoor flat surface is provided on the outer side of the outdoor groove for the above-mentioned shoji, and the indoor flat surface, the intermediate flat surface, the outdoor flat surface, and the upper surfaces of the indoor and outdoor rails are substantially the same It is formed as a feature.

  Furthermore, in the lower frame flat sash according to the present invention, the upper and lower folds and the left and right vertical folds are made of a synthetic resin, and are formed in substantially the same shape, and the inner fold and the external fold of the vertical folds face each other. The summoning bowl includes a side surface component member that covers a portion corresponding to the indoor hanging part and the outdoor hanging part in the lower wall, and the smoke return member made of metal is provided between the side surface component and the summing surface to the above-described inner and outer shoji. Each of the smoke return members is provided with a linking portion linked to each other.

  The lower frame flat sash according to the present invention is characterized in that the lower ends of the indoor hanging part and the outdoor hanging part respectively hold a watertight material, and the watertight material abuts on the indoor groove and the outdoor groove, respectively. Has been.

  According to the lower frame flat sash according to the present invention, the lower end portions of the indoor hanging portion and the outdoor hanging portion of the lower heel are respectively formed on the inner side of the indoor surface and the outdoor surface of the lower heel, The side surface is located on the outdoor side of the indoor side surface of the lower collar, and the outdoor side surface of the outdoor groove is located on the indoor side of the outdoor side surface of the lower collar, so that the indoor groove and the outdoor groove of the lower frame are made smaller in the expected direction. As you do. Since the lower end portion of the lower eyelet accommodated in each 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 summoning bowl is provided with a side surface constituting member, and a smoke return member made of metal is provided from the side surface constituting member to the summing surface. The strength can be ensured and strong linkage can be achieved, and the airtightness of the sash can be enhanced.

  And according to the lower frame flat sash which concerns on this invention, a watertight material is provided in the lower end part of a lower collar, and it can prevent intrusion of rain water etc. by contact | abutting to an indoor groove | channel 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. Further, rail portions 12 and 12 for allowing the inner and outer shojis 2 and 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. Yes.

  Further, an inner shroud chamber groove 13 is formed between the indoor rail portion 12 and 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. The Further, a door frame groove 15 is formed between the outdoor rail portion 12 and the intermediate flat surface 11b, and a door frame outer groove 16 is formed between the outdoor rail portion 12 and the outdoor flat surface 11c. The

  The inner pouch indoor groove 13, the inner pouch outdoor groove 14, the outer pouch indoor groove 15, and the outer pouch indoor groove 16 guide the lower end of the lower arm 40 when the inner pouch 2 or the outer pouch 3 travels. In addition, a drainage hole is provided on the bottom surface, and 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 so as to have substantially the same height as the floor surface on the indoor side, and the lower part thereof is formed in a hollow shape to constitute the indoor hollow portion 18a. The outdoor flat surface 11c is formed to have substantially the same height as the floor surface of a deck or the like provided on the outdoor side, and the lower part thereof is formed in a hollow shape to constitute the 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 hollow portion 18a and the outdoor hollow portion 18b are formed at the indoor side end and the outdoor side end of the lower frame 10, respectively, the flat portion of the sill surface 11 can be enlarged and a large force is easily applied. The strength of the end portion of the lower frame 10 can be sufficiently secured. 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 has a projecting intermediate base 19 that constitutes the outdoor side surface 14a of the inner groove 14 and the indoor side surface 15a of the inner door groove 15 over substantially the entire length in the longitudinal direction excluding the summing part of the shoji. The lower frame cover body 70 is provided with a mounting portion 70a that can be attached to and detached from the intermediate base portion 19 at the lower portion. The lower frame cover body 70 is provided over substantially the entire length in the longitudinal direction excluding the summing part of the shoji. The upper surface of the lower frame cover body 70 is formed to be substantially flat, and constitutes 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 lower end 46 on the outdoor side of the lower arm 40 and the lower end 45 on the indoor side of the lower arm 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. If the flat surface of the lower frame flat sash is made as wide as possible, the expected width of each groove for guiding the shoji is reduced, which makes cleaning work difficult. In the lower frame flat sash of this embodiment, the lower frame cover Since the intermediate flat surface 11b can be removed by detachably attaching the body 70 and the airtight block 80 to the lower frame 10, the cleaning operation can be facilitated.

  In addition, the lower frame cover body 70 has projecting portions 70b and 70b that protrude in the indoor direction and the outdoor direction from the intermediate base portion 19 of the lower frame 10 in order to increase the expected width of the upper surface. The upper surface of the portion projecting outwardly faces the lower surface 44 a of the outdoor hanging part 44 in the inner shy hand 2, while the upper surface of the part projecting in the outdoor direction faces the lower surface 43 a of the indoor hanging part 43 in the outer obstacle 3.

  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 part 43 has a lower end 45 on the indoor side that is disposed on the outer side of the indoor surface 41 of the lower basket 40 at the lower end, and the outdoor hanging part 44 has an outdoor surface of the lower casing 40 at the lower end. It has an outdoor lower end 46 disposed on the indoor side of 42. That is, the lower end of each of the indoor hanging portion 43 and the outdoor hanging portion 44 is formed on the inner side of the indoor outer surface of the lower rod 40.

  The indoor-side lower end 45 and the outdoor-side lower end 46 of the inner shoji 2 are respectively disposed in the inner shroud indoor groove 13 and the inner shroud outdoor groove 14 and are guided when the inner shroud 2 travels. Further, the indoor lower end 45 and the outdoor lower end 46 of the shoji 3 are disposed in the shoji indoor groove 15 and the shoji room outer groove 16, respectively, and are guided when the shoji 3 travels.

  Further, in both the inner shoji 2 and the outer shoji 3, the indoor-side lower end 45 and the outdoor-side lower end 46 are provided with watertight materials 73 and 73 on the surfaces facing the rail portion 12, respectively, and rainwater from the outdoor side is provided. Prevents intrusion.

  Here, the indoor side surface 13a of the inner frame 13 of the inner frame 13 of the lower frame 10 is arranged outside the indoor surface 41 of the lower frame 40, and the outdoor side surface 14a of the outer frame 14 of the inner frame 14 of the lower frame 10 is It is arrange | positioned indoors rather than the outdoor surface 42 of 40. Further, the indoor side surface 15a of the outer frame indoor groove 15 of the lower frame 10 is disposed on the outdoor side of the indoor surface 41 of the lower frame 40, and the outdoor side surface 16a of the external frame 16 of the external frame 16 of the lower frame 10 is formed on the lower frame 40. It is arrange | positioned indoors rather than the outdoor surface 42 of this. Therefore, the lower eyelid 40 is placed in each groove of the lower frame 10 as follows.

  The indoor hanging part 43 of the lower collar 40 in the inner shredder 2 has a lower surface 43a facing the indoor flat surface 11a of the lower frame 10 and is further suspended from the lower surface 43a on the outdoor side, that is, inside the lower collar 40. The inner lower end 45 is received in the inner shroud groove 13. In addition, the outdoor hanging portion 44 of the lower collar 40 in the inner shoji 2 has a lower surface 44a facing the intermediate flat surface 11b of the lower frame 10 and is further suspended indoors from the lower surface 44a, that is, inside the lower collar 40. An outdoor lower end portion 46 is accommodated in the inner casing 14 outer groove 14.

  Furthermore, the interior hanging portion 43 of the lower heel 40 in the external shoji 3 has a lower surface 43a facing the intermediate flat surface 11b of the lower frame 10 and is further suspended from the lower surface 43a on the outdoor side, that is, inside the lower heel 40. The indoor-side lower end portion 45 is placed in the outer door groove 15 of the outer screen. 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.

  In this way, by forming the width in the expected direction of the lower end portion of the lower arm 40 small enough to hold the watertight material 73, each flat surface of the sill surface 11 is provided to the inner side of the indoor outer surface of the lower arm 40. And the flat surface of the sill surface 11 can be formed wider in the expected direction.

  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. The smoke return member 63 is fixed to the vertical rod 60 by screwing. Moreover, each smoke return member 63, 63 provided in each of the inner shoji 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 drainage hole 13 b that penetrates the rail portion 12 on the indoor side to the inner groove 14 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 communicating with the hollow portion 17 of the lower frame 10 is formed in the bottom surface of the inner shroud chamber outer groove 14. A drain hole 15b communicating with the hollow portion 17 of the lower frame 10 is formed on the bottom surface of the outer shroud chamber groove 15, and further, a drain hole communicating with the hollow portion 17 of the lower frame 10 is formed on the bottom surface of the outer frame 17 of the outer frame. 16b is formed.

  The hollow portion 17 of the lower frame 10 is divided into a plurality of regions as shown in FIG. 6, and the water guided to the indoor side region of the hollow portion 17 through the drain holes 14b and the drain holes 15b passes through the communication holes 17a. Then, it is guided to the outdoor region, and further guided to the hollow portion 71a of the lower frame reinforcing member 71 that reinforces the lower frame 10 through the communication hole 17b. 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 includes the above-described external drain hole 71b, whereby the lower frame reinforcing member 71 is interposed through the hollow portion 71a. 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 each groove formed in the sill surface 11 from the external drain hole 71b. The height to the bottom surface can be increased, and even if a large amount of water has entered the sash, the water level should be a highly water-tight sash that is difficult to reach each groove of the sill surface 11. Can do.

  Further, the water guided to the outermost region of the hollow portion 17 through the drain hole 16b is discharged to the outside through the external drain hole 17c. Thus, by providing a plurality of external drain holes and dispersing the drainage, the water that has entered the sash can be drained efficiently.

  As shown in FIG. 7, a door stop stopper 81 is provided at the longitudinal end portion of the inner door groove 13, and a drain hole 13 b is formed below the door stopper 81. Further, drainage holes 14b are formed in the inner groove 14 outside the inner shoji room in the vicinity of the end in the longitudinal direction and in the vicinity of the summoning portion. Here, a check valve for preventing the backflow of water is attached to the drain hole 14b on the side of the external obstacle 3 exposed to the indoor side.

  Further, drainage holes 15b and 16b are formed in the vicinity of the longitudinal direction end portion and the summoning portion in the outer armature chamber groove 15 and the outer armature chamber outer groove 16, 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 frame 3 Outer frame 10 Lower frame 11 Sill surface 11a Indoor side flat surface 11b Intermediate | middle flat surface 11c Outdoor flat surface 12 Rail part 12a Base part 12b Rail member 13 Inner element indoor groove 14 Inner element outdoor groove 15 Outside Sliding door indoor groove 16 Outside sliding door outdoor groove 20 Upper frame 30 Vertical frame 40 Lower rod 43 Indoor hanging portion 44 Outdoor hanging portion 45 Indoor lower end portion 46 Outdoor lower end portion 50 Upper rod 60 Vertical rod 61 Side surface component 63 Smoke return member 63a Linking part 70 Lower frame cover body 73 Watertight material 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 portion of the indoor hanging portion and the outdoor hanging portion is lower than the indoor surface and the outdoor surface of the lower arm, respectively. Formed inside,
The lower frame has a sill surface on which the shoji runs so as to be substantially flat, and has an indoor groove and an outdoor groove in the longitudinal direction for accommodating the lower ends of the indoor hanging part and the outdoor hanging part, respectively. The indoor side surface is located on the outer side of the lower heel indoor surface from the lower end to the upper end, and the outdoor side surface of the outdoor groove is located on the indoor side of the lower heel outdoor surface from the lower end to the upper end. A flat sash with a lower frame.   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 indoor groove for the inner shoji, an intermediate flat surface is provided between the outdoor groove for the inner shoji and the indoor groove for the outer shoji, and the outer shoji An outdoor flat surface is provided outside the outdoor groove for use, 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. Item 2. A lower flat sash according to item 2.   The upper and lower saddles and the left and right vertical saddles are made of a synthetic resin and are formed in substantially the same shape. And a side component that covers a portion corresponding to the outdoor hanging part, and a smoke return member made of metal from the side component to the summing surface is provided on each of the inner and outer obstacles, and the respective smoke return members are linked to each other. 4. The lower frame flat sash according to claim 2, further comprising a linkage portion.   5. The lower end of the indoor hanging part and the outdoor hanging part respectively hold a watertight material, and the watertight material comes into contact with the indoor groove and the outdoor groove, respectively. Bottom sash of the bottom.

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