Folding door

Abstract

To provide a folding door that can maintain a proper form.SOLUTION: In a folding door 10, a first sash 16 on a hanging base side and a second sash 18 on a door edge side are foldably connected by an intermediate hinge 22 at their joining parts 20. A protrusion 60 is provided between an inner peripheral side depth surface of a hanging frame 28 and a portion below a center height of each header of a first upper frame 32 and a first lower frame 34. The protrusion 60 is provided between an inner peripheral side depth surface of a door edge frame 42 and a portion below a center height of each header of a second upper frame 46 and a second lower frame 48. The protrusion 60 is provided on an inner peripheral side depth surface of a first joining frame 30 and on a portion above the center height of each header of the first upper frame 32 and the first lower frame 34. The protrusion 60 is provided on an inner circumferential side depth surface of a second joining frame 44 and on a portion above the center height of each header of the second upper frame 46 and the second lower frame 48.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention is At the door Regarding. [Background technology]

[0002] In swing doors, the door edge frame can sag due to the weight of the surface material, etc. For this reason, Patent Document 1 proposes making the door edge an approximately parallelogram offset higher than the hanging edge, and by attaching the door frame to the door frame, the door edge sags, making the shoji approximately rectangular, and ensuring that the in-plane gap between the door edge of the door frame and the door frame is within the allowable value. In this door, the upper and lower frames are inclined by interposing V-shaped liners between the longitudinal ends of the upper and lower frames and the hanging frame.

[0003] On the other hand, there is a known folding door in which a first shoji screen on the hanging side and a second shoji screen on the door tip side are foldably connected by a hinge at their joints. The door tip frame of the second shoji screen is supported by a door roller. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-180023 Summary of the Invention [Problem to be solved by the invention]

[0005] In the folding doors described above, the weight of the first and second shoji screen panels can cause the joints to sag, raising concerns that this could cause the second shoji's stile to tilt. The shoji described in Patent Document 1 is intended for swinging doors, and cannot be applied directly to folding doors in which the joints are connected by hinges and the second shoji's stile is supported by rollers. Furthermore, the shoji described in Patent Document 1 uses a V-shaped liner, which increases the number of parts and complicates assembly.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a folding door that can maintain an appropriate shape. 。 [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the folding door of the present invention is a folding door in which a first shoji on the hanging side and a second shoji on the door tip side are foldably connected by a hinge at their joining parts, and the door tip frame of the second shoji is supported by a door roller, and the first shoji has a hanging frame, a first joining frame that constitutes the joining part, a first upper frame and a first lower frame that connect between the hanging frame and the first joining frame, and the second shoji has a door tip frame, a second joining frame that constitutes the joining part, and connects between the door tip frame and the second joining frame. The door has a second upper frame and a second lower frame, and the edges of the first upper frame, the first lower frame, the second upper frame and the second lower frame are perpendicular to the visible wall and the visible wall, and is characterized by having a hanging-side inclined support portion provided between the inner peripheral visible surface of the hanging frame and the portion below the center height of the edges of the first upper frame and the first lower frame, which inclines the edges with respect to the vertical plane, and a door-end-side inclined support portion provided between the inner peripheral visible surface of the door-end frame and the portion below the center height of the edges of the second upper frame and the second lower frame, which inclines the edges with respect to the vertical plane.

[0008] Furthermore, the shoji screen of the present invention is a shoji screen having a hanging frame, a door end frame, and upper and lower frames connecting the hanging frame and the door end frame, characterized in that a first protrusion is provided on the inner peripheral surface of the hanging frame below the center height of the edges of the upper and lower frames, which tilts the edges relative to the vertical plane, and a second protrusion is provided on the inner peripheral surface of the door end frame above the center height of the edges of the upper and lower frames, which tilts the edges relative to the vertical plane. [Effects of the Invention]

[0009] According to the present invention, the upper and lower frames are tilted by the corresponding tilt support parts when they are not under their own weight, and when they are under their own weight, they can maintain the appropriate shape. If the tilt support parts are formed as protrusions, the number of parts can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view showing a fitting equipped with a folding door according to an embodiment of the present invention. FIG. [Figure 2] A cross-sectional view of the fixture with two folding doors closed. [Figure 3] A cross-sectional view of the fixture with two folding doors open. [Figure 4] A vertical cross-section of the fixture with two folding doors closed. [Figure 5] A vertical cross-sectional view of the first upper frame. [Figure 6] A vertical cross-sectional view of the first lower frame. [Figure 7] This is a vertical view of the hanging frame seen from the inner periphery. [Figure 8] This is a vertical view of the lower part of the hanging frame seen from the inner periphery. [Figure 9] A cross-sectional view of the hanging frame. [Figure 10] FIG. 2 is a cross-sectional view of a protrusion and its surroundings. [Figure 11] This is a vertical view of the first joining frame seen from the inner side. [Figure 12] A cross-sectional view of the first joining frame. [Figure 13] FIG. 1 is a schematic front view of a folding door when its own weight is not acting on it. [Figure 14] FIG. 10 is a front view showing a fitting according to a first modified example. [Figure 15] FIG. 10 is a cross-sectional view of the fitting according to the first modified example with the folding door in an open state. [Figure 16] FIG. 10 is a front view showing a fitting according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the folding door and the shoji screen according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments.

[0012] FIG. 1 is a front view showing a fitting 12 equipped with a folding door 10 according to an embodiment of the present invention. The fitting 12 is a so-called double-swing type, and has two folding doors 10. FIG. 2 is a cross-sectional view of the fitting 12 with the two folding doors 10 closed. FIG. 3 is a cross-sectional view of the fitting 12 with the two folding doors 10 open. FIG. 4 is a vertical cross-sectional view of the fitting 12 with the two folding doors 10 closed. The fitting 12 separates the interior and exterior of a building, and FIG. 1 shows the fitting 12 as seen from inside the room. The fitting 12 may also separate rooms within a room (for example, a bathroom and a changing room).

[0013] The fitting 12 has two folding doors 10 within an opening in a frame 14. The frame 14 is constructed by framing two vertical frames 14a and an upper frame 14b and a lower frame 14c that connect the vertical frames 14a on all four sides. The vertical frames 14a, upper frame 14b, and lower frame 14c that make up the frame 14 are extruded shapes made from aluminum alloy, each with a substantially uniform cross section along its entire length. A rail 14ca is provided on the lower frame 14c. The two folding doors 10 are symmetrical except for the butt joint. For ease of explanation, the two folding doors 10 are given the same reference numerals in this application, and only the right side in Figure 1 will be described.

[0014] In this application, the "visible direction" refers to the indoor / outdoor direction of the fitting 12. The "visible surface" refers to a surface extending along the "visible direction." The "visible direction" refers to a direction perpendicular to the "visible direction," and in the case of a vertical frame 14a or the like that is long in the vertical direction, it refers to the left-right direction that is perpendicular to the longitudinal direction, and in the case of an upper frame 14b or the like that is long in the horizontal direction, it refers to the up-down direction that is perpendicular to the longitudinal direction. The "visible surface" refers to a surface along the "visible direction."

[0015] In the folding door 10, a first shoji screen 16 on the hinge side and a second shoji screen 18 on the door tip side are foldably connected at their joints 20 by an intermediate hinge 22. The first shoji screen 16 and the second shoji screen 18 are provided with a face material 24. The face material 24 is, for example, double-glazed glass.

[0016] The first shoji screen 16 is configured such that a surface material 24 is disposed on the inner periphery of a first frame 26. The first frame 26 is configured with a four-way frame assembly consisting of a hanging frame 28, a first joining frame 30 that constitutes the joining section 20, and a first upper frame 32 and a first lower frame 34 that connect the hanging frame 28 and the first joining frame 30. The first shoji screen 16 can be opened and closed because the hanging frame 28 is connected to the vertical frame 14a by a hanging hinge 36.

[0017] The second shoji screen 18 is configured such that a surface material 24 is disposed on the inner periphery of the second frame 40. The second frame 40 is made up of a door end frame 42, a second joining frame 44 that constitutes the joining section 20, and a second upper frame 46 and a second lower frame 48 that connect the door end frame 42 and the second joining frame 44, assembled on all four sides to form a rectangular frame.

[0018] The door stile 42 has a first door stile 42a connected to the second upper stile 46 and the second lower stile 48, and a second door stile 42b foldably connected to the first door stile 42a by a door stile hinge 50. A door roller 52 that rolls along a rail 14ca is provided at the bottom of the second door stile 42b. In other words, the movement direction of the second door stile 42b is guided by the rail 14ca.

[0019] The first shoji screen 16 and the second shoji screen 18 are equal in height and width. The first frame 26 and the second frame 40 are extruded aluminum alloys, similar to the frame materials mentioned above. The edges of each frame are perpendicular to the front and back walls. However, as described below, the edges of each upper and lower frame are inclined relative to the vertical when assembled into the door 12. The intermediate hinge 22 is composed of two hinges 22a with a relay member 54 in between. The first shoji screen 16 and the second shoji screen 18 are fitted inside the frame 14 when the folding doors 10 are closed. When the two folding doors 10 are closed, their door end frames 42 abut against each other, completely blocking the opening in the frame 14.

[0020] When the folding door 10 is open, the first shoji screen 16 and the second shoji screen 18 protrude from the opening of the frame 14 and face each other, making the width in the left-right direction in Figure 3 sufficiently small. When the two folding doors 10 are open, their width in the left-right direction is small, so the fitting 12 has a wide opening.

[0021] FIG. 5 is a vertical cross-sectional view of the first stile 32. As shown in FIG. 5, the first stile 32 has an exterior sight wall 32a, an interior sight wall 32b, an upper sight wall 32c, and a lower sight wall 32d. These four walls form a roughly square hollow space 32e. Four screw holes 56 are formed in the first stile 32. The screw holes 56 are for screwing the hanging frame 28 and the first joining frame 30. They have a C-shaped cross section and extend longitudinally within the hollow space 32e. The second stile 46 and the second lower frame 48 of the second shoji screen 18 also have the same number of similar screw holes 56. The screw holes 56 in the second stile 46 and the second lower frame 48 are for screwing the door end frame 42 and the second joining frame 44.

[0022] The four screw holes 56 are provided at positions that are approximately symmetrical in the front and rear directions. Specifically, the upper two screw holes 56 (hereinafter also referred to as screw holes 56u; the same applies to other frame members) are provided in the upper front wall 32c, and the lower two (hereinafter also referred to as screw holes 56d; the same applies to other frame members) are provided in the lower front wall 32d. The two screw holes 56u are located above the center height M of the fore edge of the first upper frame 32, and the two screw holes 56d are located below the center height M. The center height M can be determined based on the hollow portion formed by the four walls (in this case, hollow portion 32e).

[0023] The two screw holes 56 on the outside of the room are symmetrical from top to bottom, and the two screw holes 56 on the inside of the room are symmetrical from top to bottom. The two screw holes 56 on the outside of the room and the two screw holes 56 on the inside of the room are located on either side of the center C in the projected direction of the edge, and more specifically, are located in approximately symmetrical positions with the center C as the reference.

[0024] Figure 6 is a vertical cross-sectional view of the first bottom frame 34. As shown in Figure 6, the first bottom frame 34 has an exterior sight wall 34a, an interior sight wall 34b, an upper sight wall 34c, and a lower sight wall 34d, and these four walls form a substantially square hollow portion 34e. The first bottom frame 34 has substantially the same shape as the first upper frame 32 and has four screw holes 56. The four screw holes 56 in the first bottom frame 34 are positioned relative to the central height M and center C as the four screw holes 56 in the first upper frame 32.

[0025] FIG. 7 is a vertical cross-sectional view of the hanging frame 28 as viewed from the inner periphery. FIG. 8 is a vertical cross-sectional view of the lower portion of the hanging frame 28 as viewed from the inner periphery. FIG. 9 is a horizontal cross-sectional view of the hanging frame 28. FIG. 10 is a cross-sectional view of the protrusion 60 and its surroundings. In FIGS. 7 and 8, the areas that abut the edges of the first upper frame 32 and the first lower frame 34 are indicated by dotted symbols. The hanging frame 28 has a total of eight through holes 58: four on the upper side and four on the lower side. The four upper through holes 58 are located in the same positions as the four screw holes 56 in the first upper frame 32. The four lower through holes 58 are located in the same positions as the four screw holes 56 in the first lower frame 34. The through hole 58 corresponding to screw hole 56u is also referred to as through hole 58u, and the through hole 58 corresponding to screw hole 56d is also referred to as through hole 58d.

[0026] The hanging frame 28 has a total of eight protrusions 60 (hanging-side inclined support portions, hanging-side protrusions), four on the top and four on the bottom. However, the number of protrusions 60 may be increased or decreased depending on the design conditions. For example, two protrusions may be provided on the top and two on the bottom, for a total of four protrusions. The same applies to the protrusions 60 on the second shoji screen 18, which will be described later. Each protrusion 60 protrudes inward (see Figures 9 and 10). The protrusions 60 are formed, for example, by a punch. The protrusions 60 are frustum-shaped, but are not limited to this. They may be, for example, annular protrusions formed around punched holes, or other convex shapes.

[0027] The four upper protrusions 60 are arranged in pairs symmetrically in the projection direction relative to the screw holes 56d and the two corresponding upper through holes 58d in the first upper frame 32. In other words, each protrusion 60 is located at a distance X from the adjacent screw holes 56d and through holes 58d in the projection direction. The distance X is set to be relatively short.

[0028] These four upper protrusions 60 are located below the center height M of each end of the first stile 32 and abut against the end face of the lower projection wall 34d, which is the lower part of the first stile 32. In other words, the four upper protrusions 60 have the effect of tilting the end of the first stile 32 relative to the vertical plane. Because the lower part of the end on the hanging side is pushed inward, the first stile 32 is tilted upward toward the joint part 20 (see Figure 13).

[0029] The protrusions 60 are located on both sides of the center C of the abutting edge in the projection direction, thereby pushing out the lower part of the edge of the first stile 32 in a balanced manner, preventing the opposite end from shifting in the projection direction. Because each protrusion 60 is located near the screw hole 56d, the force generated by fastening the screw B (see Figure 13) is effectively transmitted, reliably pushing out the lower part of the edge of the first stile 32. Because each pair of protrusions 60 is positioned symmetrically in the projection direction relative to the screw hole 56d, the force generated by fastening each screw B (see Figure 13) is transmitted to the edge of the first stile 32 in a balanced manner. Because the edge of the first stile 32 is pushed out by the four protrusions 60, stress is dispersed, preventing localized deformation. This effect due to the relative arrangement of the multiple protrusions 60 is similar for the four lower protrusions 60 and the eight protrusions 60 on the first joint frame 30, which will be described later.

[0030] The four lower protrusions 60 are arranged in pairs symmetrically relative to the screw holes 56d and the two corresponding lower through-holes 58d of the first stile 34 in the forward direction. The four lower protrusions 60 are positioned in the same relative positions as the four upper protrusions 60 relative to the screw holes 56d and the two corresponding lower through-holes 58d. In other words, the four lower protrusions 60 tilt the edge of the first stile 34 relative to the vertical plane. The lower portion of the edge of the first stile 34 is pushed inward on the hanging side, resulting in a tilt that rises toward the joint 20 (see Figure 13). This tilt angle is the same as that of the first stile 32. The four lower protrusions 60 have the same effect on the first stile 34 as the four upper protrusions 60.

[0031] Figure 11 is a vertical cross-sectional view of the first joining frame 30 as seen from the inner periphery. Figure 12 is a horizontal cross-sectional view of the first joining frame 30. In Figure 11, the areas that abut against each edge of the first upper frame 32 are indicated by dots and numbers.

[0032] A total of eight through holes 58 are formed in the first joint frame 30, four on the top and four on the bottom. The four upper through holes 58 are formed in the same positions as the four screw holes 56 in the first upper frame 32. The four lower through holes 58 are formed in the same positions as the four screw holes 56 in the first lower frame 34.

[0033] The first joint frame 30 has a total of eight protrusions (first joint inclined support portions, first joint protrusions) 60, four on the top and four on the bottom. Each protrusion 60 is the same as that on the hanging frame 28 and protrudes inward. The four upper protrusions 60 are arranged in pairs symmetrically with respect to the screw holes 56u of the first upper frame 32 and the two corresponding upper through holes 58u. The four lower protrusions 60 are arranged in pairs symmetrically with respect to the screw holes 56u of the first lower frame 34 and the two corresponding lower through holes 58u.

[0034] That is, while each protrusion 60 on the hanging frame 28 is formed at a position along the lower projecting wall 32d of the first upper frame 32 and the lower projecting wall 34d of the first lower frame 34, each protrusion 60 on the first joint frame 30 is formed at a position along the upper projecting wall 32c of the first upper frame 32 and the upper projecting wall 34c of the first lower frame 34.

[0035] The protrusion 60 of the first joining frame 30 is located above the center height M of the edges of the first upper frame 32 and the first lower frame 34, and abuts against the end faces of the upper projection wall 32c and the upper projection wall 34c. In other words, the protrusion 60 of the first joining frame 30 acts to tilt the edges of the first upper frame 32 and the first lower frame 34 relative to the vertical plane. The upper portions of the edges of the first upper frame 32 and the first lower frame 34 are pushed inward at the joining portion 20, so they are tilted downward toward the hanging end (see Figure 13). As a result, the first shoji screen 16 becomes a parallelogram, and the first joining frame 30 is biased to be slightly higher than the hanging end frame 28.

[0036] In other words, the lower portion of the fore edge of each of the first upper frame 32 and the first lower frame 34 is pushed out from the hanging frame 28 by the protrusion 60, and the upper portion of the fore edge is pushed out symmetrically from the first joining frame 30, maintaining balance. However, depending on the design conditions, even if the protrusion 60 is provided only on the hanging frame 28, the effect of tilting the first upper frame 32 and the first lower frame 34 can be obtained.

[0037] Figure 13 is a schematic front view of the folding door 10 when its own weight is not acting on it. As shown in Figure 13, the second shoji screen 18 is nearly symmetrical to the first shoji screen 16. That is, the first frame 26, the hanging frame 28, the first joining frame 30, the first upper frame 32, and the first lower frame 34 of the first shoji screen 16 correspond to the second frame 40, the door edge frame 42, the second joining frame 44, the second upper frame 46, and the second lower frame 48 of the second shoji screen 18. The second upper frame 46 is basically the same as the first upper frame 32. The second lower frame 48 is basically the same as the first lower frame 34. The door edge frame 42 has eight protrusions (door edge-side inclined support portions, door edge-side protrusions) 60 formed on it at symmetrical positions similar to those of the hanging frame 28, protruding inward. The second joining frame 44 has eight protrusions (second joining inclined support portions, second joining protrusions) 60 formed at symmetrical positions similar to those of the first joining frame 30 so as to protrude inward.

[0038] The second upper frame 46 and the second lower frame 48 are each inclined downwards toward the door edge because the lower part of the fore edge on the door edge side is pushed inward by the protrusion 60, and the upper part of the fore edge on the door joint 20 side is also pushed inward by the protrusion 60. However, depending on the design conditions, even if the protrusion 60 is provided only on the door edge frame 42, the effect of inclining the second upper frame 46 and the second lower frame 48 can be obtained.

[0039] The inclination of the second upper frame 46 and the second lower frame 48 is opposite to the inclination of the first upper frame 32 and the first lower frame 34, but the degree of inclination is the same. In other words, the second shoji screen 18 forms a parallelogram that is in the opposite direction to the first shoji screen 16. Figure 13 shows the first shoji screen 16 and the second shoji screen 18 at angles θ1 greater than 90 degrees and θ2 less than 90 degrees. However, the first shoji screen 16 and the second shoji screen 18 form such parallelograms when they are placed on a flat surface and not under their own weight before being assembled to the frame 14.

[0040] Incidentally, the folding door 10 is supported at the hanging side by the vertical frame 14a via the hanging hinge 36, and at the door tip side by the sill 14c via the door rollers 52, but the joining section 20 is not supported by the frame body 14. Because the face material 24 has a certain weight, the joining section 20 tends to sag downward as shown by the arrow in Figure 13, and as a result, the first shoji screen 16 and the second shoji screen 18 tend to tilt as if they are being pulled into the joining section 20.

[0041] As a result, the first upper frame 32, the first lower frame 34, the second upper frame 46, and the second lower frame 48, which are tilted due to the action of each protrusion 60, are slightly deformed and become approximately horizontal, and the first shoji screen 16 and the second shoji screen 18, which had formed a parallelogram, become rectangular as shown in Figure 1. In this embodiment, the deformation of each upper frame and each lower frame is set to about 10% of the amount of sagging (mainly sagging due to the opening of the abutting upper portion 62 (see Figure 1)). The rectangular shape of the first shoji screen 16 and the second shoji screen 18 prevents the door joint portion 20 from sagging, and the door edge frame 42 is maintained in a vertical orientation. The amount of protrusion 60 should be set by calculation, experiment, simulation, etc. so that the first shoji screen 16 and the second shoji screen 18 maintain their rectangular shape.

[0042] As mentioned above, as shown in Figure 1, the fitting 12 has two folding doors 10 that are symmetrical except for the butt joint. The weight of each of the two folding doors 10 is applied as shown by the arrows, but the action of the protrusions 60 keeps the door stiles 42 of both doors vertical and abut against each other. Therefore, no gaps are created at the abutting upper part 62. Because the first and second shoji screens 16 and 18 of the folding door 10 are rectangular, no undue force is applied to the hinges 22, 36, 50 or the internal mechanisms.

[0043] FIG. 14 is a front view of a fitting 12A according to a first modified example. FIG. 15 is a cross-sectional view of the fitting 12A with the folding door 10 open. The fitting 12A is a so-called single-wing type, with one folding door 10 installed within the opening of a frame 14A. The frame 14A is framed on all four sides by a pair of vertical frames 14Aa, an upper frame 14Ab, and a lower frame 14Ac. The vertical frame 14Aa has the same dimensions as the vertical frame 14a in the frame 14. The upper frame 14Ab and the lower frame 14Ac are half the length of the upper frame 14b and the lower frame 14c in the frame 14. The folding door 10 is substantially the same as that in the fitting 12. As described above, the first and second shoji screens 16 and 18 are kept rectangular by the action of the protrusions 60, so the joints 20 do not sag and the door edge frame 42 is maintained vertically. Therefore, no gap is generated at the upper contact portion 64 between the door end frame 42 and the vertical frame 14Aa.

[0044] In this way, in the folding door 10 according to this embodiment, a protrusion 60 is provided on the inner peripheral surface of the hanging frame 28 below the center height M of each edge of the first upper frame 32 and the first lower frame 34, causing each edge to tilt relative to the vertical plane. Also, a protrusion 60 is provided on the inner peripheral surface of the door end frame 42 below the center height M of each edge of the second upper frame 46 and the second lower frame 48, causing each edge to tilt relative to the vertical plane. As a result, when there is no weight, the first shoji screen 16 and the second shoji screen 18 form an inversely inclined parallelogram, and when there is weight, they become a rectangle, maintaining the proper shape.

[0045] The means for sloping the edges of the first upper frame 32, first lower frame 34, second upper frame 46, and second lower frame 48 is a protrusion 60 formed on the inner peripheral surface of each of the hanging frame 28, first joint frame 30, end frame 42, and second joint frame 44. This reduces costs without increasing the number of parts and simplifies assembly. The protrusions 60 can be easily formed using a punch or other tool. Because the edges of the first upper frame 32, first lower frame 34, second upper frame 46, and second lower frame 48 are sloping due to the protrusions 60, there is no need to bevel the edges themselves; they can simply be cut perpendicular to the longitudinal direction, which can be done using a standard processing machine. The means for tilting the edges of the first upper frame 32, first lower frame 34, second upper frame 46 and second lower frame 48 (hanging side tilt support portion, door edge side tilt support portion, first joining tilt support portion, second joining tilt support portion) is not limited to the protrusion 60 depending on the design conditions, but may be anything that is provided between the inner peripheral projecting surface of the hanging frame 28, first joining frame 30, door edge frame 42 and second joining frame 44 and each edge and tilts the edge relative to the vertical plane.

[0046] FIG. 16 is a front view of a fitting 12B according to a second modified example. The fitting 12B is a hinged door, such as a vertical sliding door, and includes a shoji screen 70 according to an embodiment of the present invention within the opening of a frame body 14B. The frame body 14B is framed on all four sides by a pair of vertical frames 14Ba, an upper frame 14Bb, and a lower frame 14Bc. The shoji screen 70 includes a face material 24 inside a frame body that is framed on all four sides by a hanging frame 72, a door end frame 74, an upper frame 76, and a lower frame 78. The shoji screen 70 has the same configuration as the first shoji screen 16 described above, and the hanging frame 72, the door end frame 74, the upper frame 76, and the lower frame 78 correspond to the hanging frame 28, the first joining frame 30, the first upper frame 32, and the first lower frame 34. The hanging frame 72 is rotatably connected to one of the vertical frames 14Ba by a hanging hinge 36, allowing the shoji screen 70 to be opened and closed.

[0047] The hanging frame 72 has a protrusion 60 (first protrusion) below the center height of each edge, just like the hanging frame 28, and the door end frame 74 has a protrusion 60 (second protrusion) above the center height of each edge, just like the first joining frame 30, which acts to make the shoji 70 a parallelogram when there is no weight on it and a rectangle when there is weight on it. With this type of fitting 12B and shoji 70, it is possible to prevent the door end frame 74 from sagging and tilting.

[0048] The proper shape of this shoji screen 70 is maintained by the protrusions 60. Because the protrusions 60 are formed on the hanging frame 72 and the door end frame 74, the number of parts is not increased, reducing costs and facilitating assembly.

[0049] The present invention is not limited to the above-described embodiment, and can of course be freely modified within the scope of the gist of the present invention.

[0050] The folding door according to the present invention is a folding door in which a first shoji screen on the hanging side and a second shoji screen on the door tip side are foldably connected by a hinge at their joining parts, and the door tip frame of the second shoji screen is supported by a door roller, and the first shoji screen has a hanging frame, a first joining frame that constitutes the joining part, a first upper frame and a first lower frame that connect between the hanging frame and the first joining frame, and the second shoji screen has a door tip frame, a second joining frame that constitutes the joining part, a second upper frame and a second lower frame that connect between the door tip frame and the second joining frame. The folding door has: an upper frame, a lower frame, a second upper frame, and a second lower frame, each of whose edges is perpendicular to the front wall and the front wall; a lower frame-side tilt support provided between the inner peripheral surface of the lower frame and a portion below the center height of the edges of the first upper frame and the first lower frame, tilting the edges relative to the vertical plane; and a front frame-side tilt support provided between the inner peripheral surface of the front frame and a portion below the center height of the edges of the second upper frame and the second lower frame, tilting the edges relative to the vertical plane. In such a folding door, the upper and lower frames are tilted by the corresponding tilt support members when they are not under their own weight, and can maintain the appropriate shape when they are under their own weight.

[0051] The folding door of the present invention may have a first joint inclination support portion provided on the inner peripheral visible surface of the first joint stile and above the center height of the edges of the first upper and lower stiles, which tilts the edges relative to the vertical plane, and a second joint inclination support portion provided on the inner peripheral visible surface of the second joint stile and above the center height of the edges of the second upper and lower stiles, which tilts the edges relative to the vertical plane. This allows the folding door to maintain an even more appropriate shape.

[0052] In the folding door according to the present invention, the hanging-side inclined support portion may be a hanging-side protrusion formed on the inner peripheral surface of the hanging stile, the door-end-side inclined support portion may be a door-end-side protrusion formed on the inner peripheral surface of the door-end stile, the first joining inclined support portion may be a first joining inclined protrusion formed on the inner peripheral surface of the first joining inclined stile, and the second joining inclined support portion may be a second joining inclined protrusion formed on the inner peripheral surface of the second joining inclined stile. In this way, forming the inclined support portions as protrusions can reduce the number of parts.

[0053] In the folding door of the present invention, the hanging protrusion, the door edge protrusion, the first joining protrusion, and the second joining protrusion may be provided on both sides of the center of the front edge of the abutting door, thereby providing balanced support for each upper and lower frame.

[0054] In the folding door of the present invention, screw holes are formed in the first upper frame and the first lower frame for fixing to the hanging frame and the first joining frame with screws, and each pair of the hanging projection, the door edge projection, the first joining projection, and the second joining projection may be arranged symmetrically in the front direction with the screw holes as the reference. This allows the force of the screws to act effectively on the upper and lower frames.

[0055] In the folding door of the present invention, the door sill has a first door sill connected to the second upper sill and the second lower sill, and a second door sill connected to the first door sill by a hinge so that it can be bent, and the door roller may be provided at the bottom of the second door sill and its movement direction may be guided by a rail.

[0056] The shoji screen of the present invention has a hanging frame, a door end frame, and upper and lower frames connecting the hanging frame and the door end frame, characterized in that a first protrusion is provided on the inner peripheral surface of the hanging frame below the center height of the edges of the upper and lower frames, tilting the edges relative to the vertical plane, and a second protrusion is provided on the inner peripheral surface of the door end frame above the center height of the edges of the upper and lower frames, tilting the edges relative to the vertical plane. With this shoji screen, the upper and lower frames can tilt due to the corresponding protrusions when they are not under their own weight, and can maintain the appropriate shape when they are under their own weight. By realizing this tilting means with protrusions, the number of parts can be reduced. [Explanation of symbols]

[0057] 10 folding door, 12, 12A, 12B fittings, 14ca rail, 16 first shoji screen, 18 second shoji screen, 20 joining part, 22 intermediate hinge, 24 surface material, 26 first frame body, 28 hanging frame, 30 first joining frame, 32 first upper frame, 34 first lower frame, 36 hanging hinge, 40 second frame body, 42 door end frame, 42a first door end frame, 42b second door end frame, 44 second joining frame, 46 second upper frame, 48 second lower frame, 50 door end hinge, 52 door roller, 54 relay material, 56, 56d, 56u screw hole, 58, 58d, 58u through hole, 60 Projection, 70 Shoji, C Center, M Center Height

Claims

1. A folding door in which a first shoji screen on the hanging side and a second shoji screen on the door tip side are foldably connected to each other by a hinge at their joining parts, and the door tip frame of the second shoji screen is supported by a door roller, The first shoji screen has a hanging frame, a first joining frame that constitutes the joining portion, a first upper frame and a first lower frame that connect the hanging frame and the first joining frame, The second shoji screen has the door edge frame, a second door edge frame constituting the door edge portion, a second upper frame and a second lower frame connecting the door edge frame and the second door edge frame, The ends of the first upper frame, the first lower frame, the second upper frame, and the second lower frame are perpendicular to the front wall and the back wall, A hanging base side inclined support portion is provided between the inner peripheral side projecting surface of the hanging base frame and a portion below the center height of each end of the first upper frame and the first lower frame, and tilts the end with respect to a vertical plane; A door-end side inclined support portion is provided between the inner peripheral surface of the door end frame and a portion below the center height of each edge of the second upper frame and the second lower frame, and tilts the edge relative to a vertical plane; A first joint inclination support portion is provided on the inner peripheral surface of the first joint frame and above the center height of each end of the first upper frame and the first lower frame, and tilts the end relative to a vertical plane; A second joint inclination support portion is provided on the inner peripheral surface of the second joint frame and above the center height of each end of the second upper frame and the second lower frame, and tilts the end relative to a vertical plane; and The hanging base side inclined support portion is a hanging base side protrusion formed on the inner peripheral side projecting surface of the hanging base frame, The door tip side inclined support portion is a door tip side protrusion formed on the inner peripheral side prospective surface of the door tip frame, The first inclined support portion is a first protrusion formed on the inner peripheral surface of the first inclined support frame, The second inclined support portion is a second inclined projection formed on the inner peripheral surface of the second inclined frame, The hanging side protrusion, the door edge side protrusion, the first door edge protrusion, and the second door edge protrusion are provided on both sides of the center of the projecting direction of the abutting edge. A folding door characterized by:

2. The first upper frame and the first lower frame have screw holes formed therein for fixing them to the hanging frame and the first joining frame with screws, The hanging side protrusion, the door tip side protrusion, the first interlocking protrusion, and the second interlocking protrusion are each arranged in pairs symmetrically in the projection direction with the screw hole as the reference.

2. The folding door according to claim 1.

3. The door frame has a first door frame connected to the second upper frame and the second lower frame, and a second door frame connected to the first door frame by a hinge so as to be bendable, The door roller is provided at the bottom of the second door frame and its movement is guided by a rail.

3. The folding door according to claim 1 or 2.

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