Building materials

Abstract

To provide a fitting capable of preventing a sash from coming off out of a frame body by maintaining engagement of the sash and an upper frame even when the sash moves downward in addition to a case where the sash moves upward or the position of an upper crosspiece of the sash is lowered.SOLUTION: A fitting includes: a frame body having an upper frame, a lower frame, and left and right vertical frames, in which the upper frame and the lower frame have a groove respectively; a sash that has a plain member inside a housing including an upper crosspiece, a lower crosspiece, and left and right vertical housings, and that is held by the upper frame and the lower frame with an upper end and a lower end inserted into the grooves respectively; and a retaining member that is provided to an upper end face of the sash protruding upward to prevent the sash from coming off out of the frame body. The retaining member includes: a movable member that is capable of moving to a standing position from the upper end face of the sash toward the inner bottom of the groove and a lying-down position falling down on the upper end face of the sash; and an operation lever that is placed on the indoor side of the sash and moves the movable member to the standing position and the lying-down position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to building materials. [Background technology]

[0002] Conventionally, there is known a fitting in which the upper and lower parts of a shoji screen are stored and supported in a Kendon style in rail grooves provided in the upper and lower frames, and the shoji screen is not supported by the left and right vertical frames (see, for example, Patent Document 1). In this fitting, a stopper member that protrudes into the rail groove of the lower frame is provided at the fixed part of the handle of the lower rail of the shoji screen to prevent the shoji screen from coming off the lower frame when it is lifted up due to vertical shaking caused by an earthquake. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-184709 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventor further investigated other causes of the shoji screen coming off the frame, other than the case where it comes off the lower frame due to vertical shaking caused by an earthquake. As a result, it was found that if the lower frame is bent due to poor construction of the frame, the shoji screen may move downward, releasing the engagement between the shoji screen and the upper frame, causing the shoji screen to come off the frame.

[0005] Furthermore, because direct sunlight generally shines on fittings from outside the room and penetrates primarily around the lower periphery of the fittings, thermal deformation can occur, causing the lower rail of a shoji screen to shrink in the viewing direction. Furthermore, when the heat of direct sunlight softens the lower rail, the weight of the glass and other surface materials contained within the shoji screen can cause the lower rail to bend, deforming the screen and reducing its vertical dimension. When the vertical dimension of the shoji screen decreases, the position of the upper rail of the shoji screen drops, changing the engagement between the screen and the frame, which can cause the screen to rattle or come off the frame.

[0006] Therefore, the inventor discovered the problem of how to prevent the shoji screen from coming off the frame body by making it possible to maintain the engagement between the shoji screen and the upper frame not only when the shoji screen moves upward, but also when the shoji screen moves downward or the position of the upper sash of the shoji screen drops. [Means for solving the problem]

[0007] The building fixture disclosed herein comprises a frame body having an upper frame, a lower frame, and left and right vertical frames, with grooves in each of the upper and lower frames; a shoji screen having a surface material on the inside of a frame body having upper slats, lower slats, and left and right vertical stiles, and held in the upper and lower frames by having its upper and lower ends inserted into the grooves, respectively; a stopper member that protrudes upward from the upper end surface of the shoji screen and prevents the shoji screen from coming off the frame body; the stopper member having a movable member that is movable between an upright position where it stands from the upper end surface of the shoji screen toward the inner bottom surface of the groove and a collapsed position where it collapses onto the upper end surface of the shoji screen; and an operating lever that is positioned on the inside of the shoji screen and moves the movable member to the upright position and the collapsed position. [Brief explanation of the drawings]

[0008] [Figure 1] This is a front view of the building fixture from the inside of the room. [Figure 2] FIG. 2 is a longitudinal cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 10 is an enlarged perspective view showing a stopper member disposed in an upright position. [Figure 5] FIG. 10 is an enlarged perspective view showing a stopper member disposed in a laid-down position. [Figure 6] This is a vertical cross-sectional view showing how a shoji screen is attached to a frame of a building fixture. [Figure 7] FIG. 2 is an enlarged perspective view of the upper end of the shoji screen. DETAILED DESCRIPTION OF THE INVENTION

[0009] Each embodiment of the fittings of the present disclosure will be described in detail below with reference to the drawings. The fittings in the embodiments are shown as a fixed window 1. The fixed window 1 is a so-called fixed window, and is attached to the inside of a frame 101 provided along the inner periphery of a rectangular opening 100 in the building frame. The fixed window 1 does not open or close the opening 100 except when the shoji screen 3 is removed for cleaning or the like.

[0010] FIG. 1 is a front view of a fixed window 1 as seen from the indoor side. In the following figures, the X1 direction indicates the outdoor side of the fixed window 1, and the X2 direction indicates the indoor side of the fixed window 1. Another window (not shown), such as a fixed window or sliding window, may be attached inside the frame 101 on the outdoor side of the fixed window 1. This creates a double-glazed window inside the frame 101, further improving thermal insulation and soundproofing. The fixed window 1 of this embodiment can be retrofitted to the indoor side of an existing window (not shown).

[0011] The fixed window 1 comprises a frame 2 provided inside the frame 101, a shoji screen 3 housed inside the frame 2, and a retaining member 4 provided on the upper end surface of the shoji screen 3. The frame 2 is formed by framing an upper frame 21, a lower frame 22, and left and right vertical frames 23, 23 in a rectangular shape. The shoji screen 3 is removably fitted inside the frame 2. The retaining member 4 is a member that prevents the shoji screen 3 from coming off the frame 2.

[0012] The upper frame 21 of the frame body 2 is integrally extruded from a resin material. The upper frame 21 has a first hollow portion 211 with a rectangular cross-section and hollow structure located on the outdoor side, a second hollow portion 212 with a rectangular cross-section and hollow structure located on the indoor side, and a flat base portion 213 that connects the upper ends of the first hollow portion 211 and the second hollow portion 212. The first hollow portion 211, the second hollow portion 212, and the base portion 213 extend over the entire length of the upper frame 21 in the extension direction. The first hollow portion 211 and the second hollow portion 212 protrude downward from the base portion 213 at the same height.

[0013] The first hollow portion 211 and the second hollow portion 212 are arranged parallel to each other and spaced apart in the indoor / outdoor direction. As a result, a groove portion 214 is formed between the first hollow portion 211, the second hollow portion 212 and the base portion 213, spanning the entire length of the upper frame 21 in the extension direction. The groove portion 214 is open downward and accommodates the upper end of the shoji screen 3. The base portion 213 forms the inner bottom surface of the groove portion 214.

[0014] The lower end of the first hollow portion 211 is provided with a sealing portion 215 that protrudes toward the inside of the room and elastically contacts the outside surface of the shoji screen 3. The lower end of the second hollow portion 212 is provided with a fin portion 216 that protrudes toward the outside of the room and elastically contacts the inside surface of the shoji screen 3. The upper frame 21 is fixed to the upper inner surface of the frame 101 with screws (not shown) that pass through the base portion 213.

[0015] The lower frame 22 of the frame body 2 is integrally extruded from a resin material. The lower frame 22 has a first hollow portion 221 having a hollow structure with a rectangular cross section and located on the outdoor side, a second hollow portion 222 having a hollow structure with a rectangular cross section and located on the indoor side, and a flat base portion 223 connecting the lower ends of the first hollow portion 221 and the second hollow portion 222. The first hollow portion 221, the second hollow portion 222, and the base portion 223 extend over the entire length of the extension direction of the lower frame 22. In this embodiment, the first hollow portion 221 and the second hollow portion 222 protrude upward from the base portion 223 at the same height, but they do not necessarily have to protrude at the same height.

[0016] The first hollow portion 221 and the second hollow portion 222 are arranged parallel to each other and spaced apart in the indoor / outdoor direction. As a result, a groove portion 224 is formed between the first hollow portion 221, the second hollow portion 222 and the base portion 223, spanning the entire length of the lower frame 22 in the extension direction, similar to the upper frame 21. The groove portion 224 opens upward and accommodates the lower end of the shoji screen 3. The base portion 223 forms the inner bottom surface of the groove portion 224.

[0017] A sealing portion 225 is integrally formed at the upper end of the first hollow portion 221, protruding toward the inside of the room and elastically contacting the outside surface of the shoji screen 3. A fin portion 226 is integrally formed at the upper end of the second hollow portion 222, protruding toward the outside of the room and elastically contacting the inside surface of the shoji screen 3. The lower frame 22 is fixed to the lower inner surface of the frame 101 by screws (not shown) that pass through the base portion 223.

[0018] 2, a plurality of resin liners 227 that support the lower end of the shoji screen 3 are provided at predetermined intervals inside the groove 224 of the lower frame 22. The liners 227 are formed in a block shape and have a height slightly lower than the height of the first hollow portion 221 and the second hollow portion 222 of the lower frame 22. Therefore, the lower end surface of the shoji screen 3 accommodated in the groove 224 of the lower frame 22 is placed on the upper surface of the liners 227, and is positioned slightly lower than the upper end surfaces of the first hollow portion 221 and the second hollow portion 222 of the lower frame 22.

[0019] The vertical frames 23 of the frame body 2 are each integrally extruded from a resin material into a substantially L-shape. The vertical frames 23 extend vertically between the upper frame 21 and the lower frame 22. The vertical frames 23 have base portions 231 extending a predetermined width along the vertical direction of the frame 101, exterior wall portions 232 extending at a substantially right angle from the exterior ends of the base portions 231 toward the inside of the frame 101, and abutment pieces 233 extending at a substantially right angle from the interior ends of the exterior wall portions 232 toward the interior.

[0020] The contact pieces 233, 233 are formed narrower than the base plate parts 231, 241 so as to come into contact with the exterior surface of the shoji screen 3. Sealing parts 234, 234 that elastically come into contact with the exterior surface of the shoji screen 3 are integrally formed at the tips of the contact pieces 233, 233. The vertical frames 23, 23 are fixed to the inner surfaces of the left and right sides of the frame 101 by screws (not shown) that pass through the base plate parts 231, 231, respectively.

[0021] The shoji screen 3 is constructed by fitting a surface material 34 such as glass through a glazing channel 341 inside a rectangular frame body 30 made up of an upper frame 31, a lower frame 32, and left and right vertical frames 33, 33. The surface material may be double-glazed glass made up of two sheets of glass. In the case of double-glazed glass, it is held in place by a retaining member made of soft PVC attached to the frame body.

[0022] As shown in Fig. 2, the upper and lower crosspieces 31 and 32 are each made up of a metal core 311, 321, resin cover materials 312, 322 that cover the outside and inside surfaces of the core, and resin upper and lower cover materials 313 and 323 that are attached to the upper and lower end surfaces of the resin cover materials 312, 322. As shown in Figs. 3 and 5, the vertical stiles 33, 33 are each made up of a metal core 331, 331, resin cover materials 332, 332 that cover the outside of the core, and end cover materials 333, 333 (see Fig. 4) that cover the upper and lower end surfaces of the vertical stiles 33, 33, respectively.

[0023] As shown in FIG. 1, the shoji screen 3 has a vertically-hung structure in which an upper sash 31 and a lower sash 32 are arranged between left and right vertical frames 33. Specifically, the left and right vertical frames 33 extend over the entire length of the shoji screen 3 in the vertical direction. The upper sash 31 and the lower sash 32 are arranged between the left and right vertical frames 33, and connect the upper ends and lower ends of the vertical frames 33, respectively. End cover materials 333 on the upper and lower end faces of the vertical frames 33 are arranged flush with the upper end cover material 313 of the upper sash 31 and the lower end cover material 323 of the lower sash 32, respectively. A roughly U-shaped handle 35 is attached to the center of the interior-facing surface of the lower sash 32.

[0024] The anti-detachment member 4 is attached to the upper surface 313a of the upper end cover material 313 of the upper rail 31 of the shoji screen 3. The upper surface 313a of the upper end cover material 313 is the upper end surface of the shoji screen 3. The anti-detachment member 4 has a movable member 41, an operating lever 42 for operating the movable member 41, and an attachment plate 43 for attaching the movable member 41 to the upper surface 313a of the upper end cover material 313, and is fixed to the upper surface 313a of the upper end cover material 313 with screws 44. Two anti-detachment members 4 are provided on the upper end surface of the shoji screen 3, spaced apart in the left-right direction, but the number of anti-detachment members 4 can be increased or decreased as appropriate depending on the size of the shoji screen 3.

[0025] The movable member 41 is formed of a frame member made of a metal plate or a resin plate having a substantially rectangular opening 411 in the center. The outer shape of the movable member 41 is formed rectangular so that, when it stands upright perpendicular to the upper surface 313a of the upper end cover material 313, it has the same cross-sectional shape as the space between the upper end surface of the shoji screen 3 housed in the frame body 2 and the groove portion 214 of the upper frame 21, as shown in Figures 2 and 4.

[0026] The operating lever 42 is formed integrally with the lower end of the movable member 41, and extends downward in a plate shape along the room-side surface 31a of the upper rail 31 of the shoji screen 3. The tip 421 of the operating lever 42 is bent approximately perpendicular to the room-side surface 31a of the upper rail 31, and extends toward the inside of the room.

[0027] The mounting plate 43 is fixed to the upper surface 313a of the upper-end cover material 313 with screws 44. The mounting plate 43 has a semicircular holding portion 431 that passes through the opening 411 of the movable member 41 and rotatably holds the lower end of the movable member 41 below the opening 411. The movable member 41 extends perpendicular to the upper surface 313a of the upper-end cover material 313 inside the holding portion 431 of the mounting plate 43 and can be rotatably moved by operating the operating lever 42 between an upright position (FIGS. 2 and 4) in which it stands toward the base portion 213 in the groove portion 214 and a laid position (FIG. 5) in which it lays down along the upper surface 313a of the upper-end cover material 313. The rotation axis J of the movable member 41 is arranged along the indoor-outdoor direction.

[0028] The mounting plate 43 may be provided with a locking mechanism (not shown) for maintaining the upright position and the reclined position of the movable member 41. The holding portion 431 of the mounting plate 43 may be provided so as to maintain the upright position and the reclined position of the movable member 41 by friction.

[0029] Next, we will explain how to insert the shoji screen 3 into the frame body 2 using the Kendon method. As shown in Figure 6, the shoji screen 3 is inserted into the groove 214 of the upper frame 21 and the groove 224 of the lower frame 22 using the Kendon method from the inside of the room. That is, first, with the upper end of the shoji screen 3 tilted toward the outside of the room, the upper end of the shoji screen 3 is inserted deep into the groove 214 of the upper frame 21. At this time, the movable member 41 of the anti-detachment member 4 is rotated about the rotation axis J and placed in the collapsed position as shown in Figure 5 by rotating the tip 421 of the operating lever 42 downward from the inside of the room. When the movable member 41 is placed in the collapsed position, the amount of upward protrusion of the movable member 41 is reduced. Therefore, the upper end of the shoji screen 3 can be inserted deep into the groove 214.

[0030] After inserting the shoji screen 3 deep into the groove 214, the lower end of the shoji screen 3 is moved toward the outside of the room and aligned with the groove 224 of the lower frame 22. Then, the shoji screen 3 is lowered and the lower end of the shoji screen 3 is inserted into the groove 224 of the lower frame 22. As a result, the upper and lower ends of the shoji screen 3 are accommodated in the grooves 214, 224, respectively, and the shoji screen 3 is fitted and held in place between the upper frame 21 and the lower frame 22. The vertical frames 23, 23 abut the sealing portions 234, 234 against the vertical stiles 33, 33 of the shoji screen 3 from the outside of the room, thereby regulating the position of the shoji screen 3 on the outside. The vertical frames 23, 23 only abut the sealing portions 234, 234 against the outside surface of the shoji screen 3, and do not hold the shoji screen 3. The sealing portion 215 and fin portion 216 of the upper frame 21 abut against the upper end of the shoji screen 3 from the outside and inside of the room, respectively, thereby ensuring airtightness, preventing the upper end of the shoji screen 3 from rattling, and blocking the intrusion of dust and other foreign matter from outside. The sealing portion 225 and fin portion 226 of the lower frame 22 abut against the lower end of the shoji screen 3 from the outside and inside of the room, respectively, thereby ensuring airtightness, preventing the lower end of the shoji screen 3 from rattling, and blocking the intrusion of dust and other foreign matter from outside.

[0031] After the shoji screen 3 is attached to the frame 2, the tip 421 of the operating lever 42 is rotated upward from inside the room, causing the movable member 41 of the retaining member 4 to rotate around the rotation axis J and be positioned in the upright position, as shown in Figures 2 and 4. The movable member 41 in the upright position protrudes upward significantly. The upper end of the movable member 41 is positioned close to the base plate 213 in the groove 214. At this time, the tip 421 of the operating lever 42 is positioned so as to contact along the lower end surface 212a of the second hollow portion 212 of the upper frame 21, as shown in Figure 2. This makes it difficult to see the operating lever 42 from inside the room, improving the appearance of the fixed window 1 from inside the room. Since the operating lever 42 is difficult to see, it is also possible to confirm that the movable member 41 is positioned in the upright position.

[0032] When the movable member 41 is in the upright position, if the shoji screen 3 moves upward within the frame body 2 due to vertical shaking caused by an earthquake or the like, the upper end of the movable member 41 abuts against the base portion 213 in the groove portion 214, restricting the upward movement of the shoji screen 3. Therefore, the lower end of the shoji screen 3 will not come off the lower frame 22. Moreover, the upper end of the shoji screen 3 will be more firmly attached to the upper frame 21 by the protruding height of the upright movable member 41. Therefore, even if the shoji screen 3 moves downward or the position of the upper rail 31 of the shoji screen 3 drops, the engagement between the upper end of the shoji screen 3 and the groove portion 214 of the upper frame 21 will be maintained, and the shoji screen 3 will not come off the lower frame 22. Therefore, the anti-detachment member 4 can prevent the shoji screen 3 from coming off the frame body 2.

[0033] The movable member 41 is provided so as to be rotatable between an upright position and a reclined position around a rotation axis J along the indoor / outdoor direction, so that when the shoji screen 3 moves in the indoor / outdoor direction, it can be prevented in the surface direction of the movable member 41. Therefore, the movement of the shoji screen 3 in the indoor / outdoor direction can be firmly prevented, and the effect of preventing the shoji screen 3 from coming off is high.

[0034] The anti-detachment member 4 is not limited to being attached to the upper surface 313a of the upper end cover material 313 of the upper rail 31 of the shoji screen 3, but may also be attached to the upper surface 333a of the end cover material 333 at the upper end of the vertical stile 33 of the shoji screen 3. The upper surface 333a of the end cover material 333 of the vertical stile 33 is disposed flush with the upper surface 313a of the upper end cover material 313 of the upper rail 31, and forms the upper end surface of the shoji screen 3.

[0035] When the anti-detachment member 4 is attached to the upper surface 333a of the end cover material 333 of the vertical stile 33, the rotation axis J of the movable member 41 of the anti-detachment member 4 may be arranged along the length direction of the upper rail 31, which is perpendicular to the indoor-outdoor direction, as shown in Fig. 7. The operating lever 42 is arranged to extend downward along the outer surface 33b of the vertical stile 33. The tip 421 of the operating lever 42 bends from the outer surface 33b of the vertical stile 33 to the indoor-side surface 33a of the vertical stile 33, and is arranged to be operable from the indoor side.

[0036] In this case, too, when the movable member 41 is in the upright position, the tip 421 of the operating lever 42 is positioned so as to contact along the lower end surface 212a of the second hollow portion 212 of the upper frame 21. When the movable member 41 is in the upright position, the operating lever 42 is prevented from rotating further upward, preventing the movable member 41 from tipping over toward the outside. This effectively prevents the shoji screen 3 from moving toward the inside of the room.

[0037] When the rotation axis J of the movable member 41 is arranged along the length of the upper rail 31, the movable member 41 may be formed long and extend from one vertical stile 33 to the other vertical stile 33. A conventional anti-detachment member that engages with the lower frame 22 may be provided at the lower end of the shoji screen 3.

[0038] The fixed window 1, which is a fixture shown in the above embodiment, has the following effects: The fixed window 1 comprises a frame body 2 having an upper frame 21, a lower frame 22, and left and right vertical frames 23, 23, with grooves 214, 224 in the upper frame 21 and lower frame 22, respectively; a shoji screen 3 having an upper rail 31, a lower rail 32, and left and right vertical frames 33, 33, with a face material 34 on the inside of the frame body 30, and whose upper and lower ends are inserted into the grooves 214, 224, respectively, to be held in the upper frame 21 and lower frame 22; and a stopper member 4 that protrudes upward from the upper end surface of the shoji screen 3 and prevents the shoji screen 3 from coming off the frame body 2. The retaining member 4 is a fixture comprising a movable member 41 that is movable between an upright position where it stands from the top surface of the shoji screen 3 toward the base plate 213, which is the inner bottom surface of the groove 214, and a reclined position where it reclins on the top surface of the shoji screen 3, and an operating lever 42 that is disposed on the interior side of the shoji screen 3 and moves the movable member 41 to the upright position and the reclined position. By operating the operating lever 42 to place the movable member 41 in the upright position, the movable member 41 protrudes upward significantly, and when the shoji screen 3 moves upward within the frame 2, the upper end of the movable member 41 abuts against the base plate 213 in the groove 214, restricting the upward movement of the shoji screen 3. Therefore, the lower end of the shoji screen 3 will not come off the bottom frame 22. Furthermore, the upper end of the shoji screen 3 engages with the upper frame 21 more by the protruding height of the upright movable member 41, so even if the shoji screen 3 moves downward or the position of the upper rail 31 of the shoji screen 3 drops, the engagement between the upper end of the shoji screen 3 and the groove 214 of the upper frame 21 is maintained and the shoji screen 3 will not come off the lower frame 22. Therefore, the anti-detachment member 4 can prevent the shoji screen 3 from coming off the frame body 2. When the movable member 41 is placed in the collapsed position, the amount of upward protrusion of the movable member 41 is reduced, so the upper end of the shoji screen 3 can be inserted deep into the groove 214.

[0039] If the movable member 41 is provided so as to be rotatable around a rotation axis J along the indoor / outdoor direction and to a standing position and a lying position, when the shoji screen 3 moves in the indoor / outdoor direction, it can be prevented by the surface direction of the movable member 41. Therefore, the movement of the shoji screen 3 in the indoor / outdoor direction can be firmly prevented, and the effect of preventing the shoji screen 3 from coming off is high.

[0040] When the movable member 41 is provided so as to be rotatable between the upright position and the downright position around a rotation axis J that runs along the length of the upper rail 31 of the shoji screen 3, the movable member 41 can be made longer than when the rotation axis J is arranged along the indoor-outdoor direction. When the movable member 41 is arranged in the upright position, the operating lever 42 comes into contact with the upper frame 21, preventing the movable member from tipping over toward the outdoors. This effectively prevents the shoji screen 3 from moving toward the indoor side. [Explanation of symbols]

[0041] 1 FIX window (door and fixture), 2 frame body, 21 upper frame, 213 base part (inner bottom surface of groove part), 22 lower frame, 23 vertical frame, 3 shoji screen, 30 frame body, 31 upper sash, 313a upper surface (upper end surface of shoji screen), 32 lower sash, 33 vertical frame, 333a upper surface (upper end surface of shoji screen), 34 surface material, 4 anti-detachment member, 41 movable member, 42 operating lever, J rotation axis

Claims

1. a frame body having an upper frame, a lower frame, and left and right vertical frames, with grooves in the upper frame and the lower frame; A shoji screen has a surface material on the inside of a frame body having an upper crosspiece, a lower crosspiece, and left and right vertical crosspieces, and is held in the upper frame and the lower frame by inserting the upper end and the lower end into the grooves, respectively; A stopper member is provided on the upper end surface of the shoji screen so as to protrude upward and prevent the shoji screen from coming off the frame body, The anti-detachment member comprises a movable member that is movable between an upright position where it stands from the top end surface of the shoji screen toward the inner bottom surface of the groove and a collapsed position where it collapses onto the top end surface of the shoji screen; an operating lever that is disposed on the inside of the shoji screen and moves the movable member to the upright position and the collapsed position; and a mounting plate that holds the movable member movably in the upright position and the collapsed position, and the mounting plate is attached to the shoji screen by being fixed to the top end surface of the shoji screen.

2. The fixture according to claim 1 , wherein the movable member is rotatably movable between the upright position and the reclined position around a rotation axis extending in the indoor-outdoor direction.

3. The fixture according to claim 1, wherein the movable member is rotatably movable between the upright position and the reclined position around a rotation axis that extends along the length of the upper rail of the shoji screen.

Images