JP3428375B2 - Folding door - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding door that is particularly convenient for wheelchair users.

[0002]

2. Description of the Related Art Conventionally, in order for a wheelchair user to open and pass a folding door, at least the open width of the wheelchair must be maintained. For this reason,
If you do not change the direction of the wheelchair during opening, you can not open the folding door to the required extent, and after passing the wheelchair, you must change the direction of the wheelchair and perform the closing operation,
It was not easy to use. Further, when the folding door is opened and closed while using the wheelchair, in addition to the operation force in the opening / closing direction being applied to the folding door, the operation force in the entering / exiting direction is also applied to the folding door due to the above-described operation mode. Considering passage
Since the supporting part for the folding door is not provided on the floor side, the folding door easily swings in the direction of entrance and exit, and there is a risk that the sliding portion may be deformed or damaged.

[0003]

SUMMARY OF THE INVENTION According to the present invention, when the folding door is opened to some extent, the door is automatically fully opened afterward, and when it is closed to a predetermined position, the door is automatically fully closed afterwards. It is an object to improve the usability, and to provide a folding door particularly suitable for wheelchair users.

[0004]

Therefore, in order to solve the above-mentioned problems, the present invention is configured as the first means,
A folding door including a first door whose open side end is rotatably supported, and a second door which is foldably connected to the first door and whose upper portion is slidably supported in an opening / closing direction with respect to a fixing member. From the time when the folding door is opened from the fully closed position to the predetermined position, the second door is biased in the opening direction, and the second door is opened from the time when the folding door is closed from the fully open position to the predetermined position.
In a folding door in which an opening / closing assisting member for urging the door in the closing direction is provided between the fixed member side and the second door side, in the opening / closing assisting member, one end of the opening / closing assisting member is the fixing member side, and The second door has a second pivot point on the door side, the second pivot point is located on the closing side of the first pivot point in the folding posture of the folding door, and the first pivot stop is in the middle of opening the folding door. It is provided so as to be located on the open side of the point, and is biased in a direction in which the distance between the first pivot point and the second pivot point is always widened.

According to a second aspect of the present invention, the opening / closing assisting member has a first link whose end is pivotally fixed to the fixed member and one end at the other end of the first link. A second link that is pivotally locked and the other end is pivotally locked to the second door side;
The first urging body is configured to constantly urge the link and the second link in the opening direction.

Further, according to the third aspect of the present invention, the opening / closing assisting member has a first link whose end is pivotally fixed to the fixing member and one end at the other end of the first link. A second link that is pivotally locked and the other end is pivotally locked to the second door side;
It comprises a first urging body that constantly urges the link and the second link in the opening direction and a second urging body that always urges the second door in the closing direction, and the urging force of the first urging body is the first. It is formed stronger than the urging force of the urging body.

Further, the present invention is configured as a fourth means, in which the opening side end is rotatably supported by a first door,
A second door and a second door slidably supported by a slide support member, which is foldably connected to the first door and has an upper portion formed on a slide member disposed on a fixed member, through a support fitting. From the opening and closing auxiliary member that urges the second door in the opening direction from the time when the second door is opened to the predetermined position from the closing posture, and from the time when the second door is closed in the closing direction from the time when the second door is closed from the opening posture to the predetermined position. In the folding door configured, the opening / closing assisting member has a first link whose end is pivotally fixed to the fixing member, and one end is pivotally fixed to the other end of the first link.
A second link, the other end of which is pivotally fixed to the slide support portion of the second door, a first urging body that always urges the first link and the second link in the opening direction, and a closing direction of the second door. The second biasing body biases the first door and the first biasing element so that the biasing force of the first biasing element is stronger than the biasing force of the second biasing element. The mounting position is adjustable, the slide supporting member is not rotatable but is rotatably connected only to the second door, and the slide member includes a first slide rail vertically disposed on the fixing member, and a first slide rail. The slide support member is formed of a second slide rail that has the same shape as the slide rail and is horizontally arranged on the fixing member.
It is formed over the first slide rail and the second slide rail.

[0008]

[0009]

[0010]

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a first door whose open side end is rotatably supported, and a slide member which is foldably connected to the first door and whose upper portion is disposed on a fixing member. A second door slidably supported by the formed slide support member via a support fitting, and the second door is biased in the opening direction from the time when the second door is opened from the fully closed position to a predetermined position. In addition, from the time of closing from the fully opened position to the predetermined position, in the folding door configured by the opening / closing assisting member for urging the second door in the closing direction, the opening / closing assisting member has the end portion pivoted toward the fixing member side. A first link that is stopped, a second link that has one end pivotally connected to the other end of the first link, and the other end that is pivotally connected to the slide support portion side of the second door, the first link, and the second link First biasing body that always biases the door in the opening direction and the second door in the closing direction A second urging body, the urging force of the first urging body is stronger than the urging force of the second urging body, and the supporting metal fitting adjusts the mounting position of the second door in the vertical direction with respect to the slide supporting member. And a slide support member that is non-rotatable and is rotatably connected only to the second door, wherein the slide member includes a first slide rail disposed in a vertical direction and a first slide rail.
The second slide rail has the same shape as the slide rail and is arranged in the horizontal direction, and the slide support member is formed over the first slide rail and the second slide rail.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 shows a front view of a state in which the present invention is used as a folding door for a toilet. 2, the present invention will be described below with the right side as the closed side, the left side as the open side, the front side as the front side, the back side as the back side, and the front and back side directions as the entrance and exit directions. Reference numeral 100 indicates a folding door of the present invention, and the folding door 100
Is an open / close side vertical frame 11, 11 which is erected at the open / close side end.
A three-way frame 1 including an upper frame 12 arranged at the upper ends of the open-close vertical frames 11 and 11, and a pivot hinge 21 formed at the upper and lower ends of the closed side inner surface of the open vertical frame 11. The upper and lower ends of the open side are rotatably supported by the first door 2 having a door stop 22 on the end surface of the open side, the closed side end of the first door 2 and the hinge 31 (shown in FIG. 3). A second door 3 which has a door stop 32 on the end surface on the closing side and which is foldably connected via
It is composed of front and back rammer panels 10, 10 and the like that are located above the first door 2 and the second door 3 on both sides of the inside of the three-sided frame 1 and that conceal the internal structure.

The second door 3 has a handle 33 and a display unit 3 on the front surface side.
4 is provided, and on the rear surface side thereof, a display lock 35 (see FIG. 3) which can be engaged with and disengaged from an engagement hole 350 (shown in FIG. 3) formed in the inner surface of the closing side vertical frame 11. ) Is rotatably provided, and further has a confirmation window 36 formed on both front and back sides, and is provided rotatably on the upper surface of the substantially central portion in the opening and closing side direction (see FIGS. 2 and 2). 5 shows.)
And a slide member 700 of a fixed member 6 disposed on the inner surface between the upper end portions of the open / close side vertical frames 11 via a slide support member 5 to which the support fitting 4 is connected so as to be slidable in the open / close direction. Has been done.

Reference numeral 37 is a step portion 111 of the closed vertical frame 11.
A cushioning member attached to the surface side of the second cushion 3 for cushioning the impact when the second door 3 is closed is shown. Reference numeral 9 is located above the second door 3 so that the folding door 100 can be easily opened and closed and fixed. The opening and closing auxiliary member formed between the member 6 and the second door 3 side is shown.

The support fittings 4 are formed on the upper and lower ends,
Vertical screw shaft portions 43, 44 with which the upper and lower nuts 41, 41, 42, 42 are screwed together, a rotating shaft portion 45 formed in a cylindrical shape continuous to the upper end of the lower screw shaft portion 44, and a rotating shaft portion 45. Is formed by a fitting shaft portion 46 formed in a hexagonal shaft continuous to the upper end of the. The support fitting 4 is rotatably attached to a support fitting mounting seat 58 screwed to the inner surface of the upper end of the second door 3.

That is, the support metal fitting seat 58 is provided with an upper wall 581, side walls 582 and 582 on the side of opening and closing, and side walls 582 and 582 on the side of opening and closing, which are connected to the end portion of the side of the upper wall 581 so as to project downward. A lower end portion 582 is formed of connecting walls 583 and 583 that are continuously provided so as to project toward the opening / closing side, and a rotation hole 586 into which a rotation support cylinder 585 is fitted is formed in the center portion of the upper wall 581. The dynamic support cylinder 585 is a cylindrical cylinder portion 587 that is fitted into the rotation hole 586, and a contact support portion 588 that is connected to the lower end portion of the cylinder portion 587 and contacts the lower surface of the upper wall 581.
And a through hole 589 penetrating in the vertical direction.

Then, the rotary shaft portion 45 of the support fitting 4 is fitted into the through hole 589, and the lower washer 580 is attached to the lower screw shaft portion 44 projecting below the contact support portion 588, and then the lower nut 42. , 42, which are screwed to the lower nuts 42, 42, and the lower screw shaft portion 44 protruding below the lower screw shaft portion 441 is attached to the lower screw shaft portion 44. The support metal fitting 4 is screwed to the inner surface of the upper end portion of the two door 3, and is rotatably connected to the second door 3 via the support metal fitting seat 58 so as to project upward.

The slide supporting member 5 is integrally or screwed to the first and second slide rails 7 and 8 connected to the fixing member 6, and the supporting metal fitting 4
And a horizontal support portion 51 to which is attached, and the horizontal support portion 51 is continuously provided upward from the rear end portion of the horizontal support portion 51, and is provided on the front surface side with a stopper 4
0 is attached and a part of the opening / closing assisting member 9 is attached to the back side, an upper horizontal portion 53 that is continuously provided from the upper end of the vertical support portion 52 toward the front side, and an upper horizontal portion 5
It is formed by a slide rail connecting portion 56 formed of a first mounting portion 54 and a second mounting portion 55, which is formed in an inverted L shape from the end on the surface side of 3 toward the upper side.

The horizontal support portion 51 of the slide support member 5
A fitting hole 511 into which the fitting shaft portion 46 of the support fitting 4 is fitted from the front side in a non-rotatable manner is formed in the upper part of the support fitting 4, and the upper washer 411 is attached to the upper screw shaft portion 43 of the support fitting 4. In the state where the upper nuts 41, 41 are screwed together, the fitting shaft portion 46 is fitted into the fitting hole 511 from the front surface side. In this state, the second washer 3 is supported by the upper washer 411 and the upper nut 41.
It is hung from the slide support member 5 via the, and further, the retaining metal fitting 57 is connected to the horizontal supporting portion 51 from the front surface side to prevent the supporting metal fitting 4 and the second door 3 from moving in the front surface side direction. That is, the retaining metal fitting 57 has a fitting notch 571 similar to the fitting hole 511 formed from the back surface side, and this fitting notch 571 is fitted from the front surface side to the lower surface of the horizontal support portion 51. The horizontal support portion 5 is fitted to the mating shaft portion 46.
It is screwed to 1.

Then, by rotating the upper nuts 41, 41 to adjust the screwing position with the upper screw shaft portion 43, the vertical mounting height of the second door 3 is adjusted, and then the rising stopper metal fitting is adjusted. 40 is screwed to the surface side of the slide support member 5, and the second
Prevent the door 3 from moving upward. That is, the rising prevention metal fitting 40 is formed in a substantially L-shaped cross section, and is attached to the vertical support portion 52 of the slide support member 5 from the front surface side with a mounting portion 401, and from the upper end of the mounting portion 401 toward the front surface side. The rising stopper projection piece 403 having an insertion hole 402 through which the upper end of the upper screw shaft portion 43 of the support fitting 4 penetrates and abutting on the upper end surface of the upper nut 41, and the surface side end portion of the rising prevention projection piece 403 It is formed by a downward projecting piece 404 that projects downward at the center and is located on the surface side of the upper end of the upper screw shaft portion 43.

The fixing member 6 is provided with open / close side vertical frames 11, 11.
Between the upper end portions of the horizontal mounting wall 62 and the horizontal mounting wall 62 formed in the slide member coupling concave portion 61 formed on the front surface over the entire width in the opening / closing direction, and the horizontal mounting wall 62 is connected downward from the rear end portion of the horizontal mounting wall 62. A vertical mounting wall 63 is provided, and an upper horizontal wall 64 and a back side vertical wall 65 are integrally formed on the back side of the horizontal mounting wall 62 and the vertical mounting wall 63 with a predetermined gap. .

The slide member 700 mounted in the slide member connecting concave portion 61 includes the first slide rail 7 disposed over the entire width of the vertical mounting wall 63 on the front surface side in the opening / closing direction and the horizontal mounting wall 62. The second slide rail 8 is arranged over the entire width of the lower surface in the opening / closing direction,
The first slide rail 7 includes a fixed rail 71 having a substantially C-shaped cross section that is screwed to the vertical mounting wall 63, and a fixed rail 71.
A movable rail 74 having a substantially C-shaped cross section, which is slidably disposed on the ball retainer 72, balls 73, ...
The width dimension of the moving rail 74 in the opening / closing direction is approximately twice the width dimension of the slide support member 5 to which the support fitting 4 is connected in the opening / closing direction.
2 is formed to have a length that is approximately one half of the width dimension of the fixed rail 71 in the opening / closing direction, corresponding to the movement of one half of the moving distance of the moving rail 74.

The second slide rail 8 comprises a moving rail 84 having a substantially horizontal C-shaped section which is slidably disposed through a substantially horizontal C-shaped section which is screwed to the horizontal mounting wall 62. The width dimension of the moving rail 84 in the opening / closing direction is almost twice the width dimension of the slide support member 5 to which the support fitting 4 is connected in the opening / closing direction, and the ball retainer 82 has a moving distance of the moving rail 84. Corresponding to the movement of one-half distance, the length of the fixed rail 71 is formed to be approximately one half of the width dimension in the opening / closing direction.

That is, the first slide rail 7 and the second slide rail 8 have the same shape, and the balls 73 ...
.., 83 ... No play is generated in the direction in which the moving rails 74, 84, the first mounting portion 54 of the slide support member 5 and the second mounting rail 54 are provided. By integrating the mounting portion 55, the load of the second door 3 is supported by the first slide rail, and even if a load is applied to the slide support member 5 in the front-back direction, it is arranged in the horizontal direction. Since the second slide rail 8 receives the load,
The swinging in the front and back directions at the time of opening and closing, which occurs in the second door 3 suspended by the slide support member 5 through the support fitting 4, is suppressed to a minimum. In the embodiment, the second slide rail 8
Are arranged horizontally, but from the horizontal direction along the direction that prevents the second door 3 from swinging in and out, that is, along the direction in which the slide support member 5 rotates about the first slide rail 7. It is more effective if it is installed in a slightly inclined horizontal direction.

The opening / closing assisting member 9 is closed in the closed state of the folding door 100 on the upper end of a link mounting seat 91 provided on the upper surface of the upper horizontal wall 64 of the fixing member 6 in the opening / closing direction so as to project upward. A first link 92 having a first pivot stop 901 whose end is pivoted in a substantially horizontal posture toward the side, and one end is pivoted to the other end of the first link 92 and the other end is a slide support member. A second link 94 having a second pivotal stop point 902 pivotally fixed to a link lower mounting seat 93 provided on the back surface side of 5;
A first urging body 95 (a bow-shaped leaf spring, a compression spring, which is disposed between the first link 92 and the second link 94 and urges the first link 92 and the second link 94 in the opening direction at all times. (For example, a torsion coil spring) and the closing side end of the fixing member 6 and the slide support member 5, and always biases the second door in the closing direction and weaker than the biasing force of the first biasing body 95. It is composed of the set second urging body 96 (preferably a constant load spring).

Since the opening / closing assisting member 9 is constructed as described above, when the second door 3 is in the fully closed position, the second pivot stop 902 is formed.
Is located on the closed side of the first pivot stop 901, and the first biasing member 95
Always biases the first link 92 and the second link 94 in the opening direction, the first biasing member 95 biases the second door 3 so as to always maintain the fully closed position, and The urging body 96 also always urges the second door 3 in the direction in which the second door 3 is closed, and the fully closed posture is always maintained. From this state, the second door 3
When the second biasing members 95 and 96 are released against the biasing force, the second pivot stop point 90 is moved along with the movement of the slide support member 5.
2 moves toward the open side while reducing the distance from the first pivot stop point 901, and finally the second pivot stop point 902 is located below the first pivot stop point 901. (The state shown in the phantom line in FIG. 7). In this state, the urging force of the first urging body 96 is applied downward, and
If the urging body 96 is not provided, the second door 3 is stopped while opening.

Further, when the second door 3 is opened against the urging force of the second urging body 96, the first pivotal stop point 902 is located on the opening side of the first pivotal stop point 901, and then the first pivotal stop point 902 is opened. The biasing force of the biasing body 95 is stronger than the biasing force of the second biasing body 96,
Further, since the first pivot stop point 901 and the second pivot stop point 902 are urged to move away from each other, the slide support member 5 automatically moves in the opening direction without applying an opening force in the opening direction. However, the folding door 100 is in the open posture, and that state is maintained.

Next, from the open position of the folding door 100, the second
When the door 3 is closed against the urging force of the first urging body 95, the second pivot point 90 is moved along with the movement of the slide support member 5.
2 moves toward the closing side while shortening the distance from the first pivot point 901, and the second pivot point 902 is positioned below the first pivot point 901 in due course. In this state, the urging force of the first urging body 96 is applied downward, and if the second urging body 96 is not present, the second door 3 is stopped during the opening.

Further, when the second door 3 is closed together with the urging force of the second urging body 96, the second pivot stop point 902 becomes the first pivot stop point 9.
From the moment of being located on the closed side of 01, the urging force of the first urging body 95 is urged so that the distance between the first pivotal stop point 901 and the second pivotal stop point 902 becomes longer. With the urging force of the body 96, the slide support member 5 automatically moves in the closing direction without applying the closing force in the closing direction, and the folding door 1
0 is a closed posture, and that state is maintained.

That is, the folding door 100 is automatically closed from the time when the second pivot stop 902 is located on the closing side of the first pivot stop 901, and the second pivot stop 902 is moved to the first pivot stop 901. Since the folding door 100 is automatically opened from the time when the folding door 100 is located on the open side, it is easy to pass through with a wheelchair and is convenient. Further, although the second biasing body 96 is provided in the embodiment, the above function can be sufficiently exerted without providing the second biasing body 96. However, when used only with the first biasing body 95,
When the second door 3 is fully closed, the slide support member 5 hardly moves to the closing side and is fully closed by the rotation of the support fitting 4 and the second door 3. When the biasing force of the biasing body 95 is increased, the folding door 100 is suddenly opened in the middle of opening, and an impact sound is generated when the folding door 100 is fully opened. (There is no particular problem in using it.)

Then, in order to eliminate the impact noise, the first urging body 9
If the biasing force of 5 is weakened, there is a possibility that the folding door 100 may not be fully closed automatically when the folding door 100 is closed. A second biasing body 96 that biases in the closing direction is provided, and the folding door 100 is automatically fully closed by adding the biasing force of the second biasing body 96 to the biasing force of the first biasing body 95. By setting the urging force of the second urging body 96 to be slightly weaker than the urging force of the first urging body 95, the urging force in the opening direction from the middle of the opening is weakened, and the impact sound generated by the sudden full opening is generated. To prevent.

In the opening / closing assisting member 9 of the embodiment, the first urging body 95 is arranged between the first link 92 and the second link 94,
The second urging body 96 is arranged between the fixed member 6 and the slide support member 5. Basically, the opening / closing assisting member 9 has a first pivoting point whose one end is pivotally fixed to the fixing member 6. 901 and a second pivot stop point 902 having the other end pivotally secured to the second door 3 side. The second pivot stop point 902 is the closing side of the first pivot stop point 901 when the folding door 100 is in the closed posture. And the second pivot stop 902 is provided on the open side of the first pivot stop 901 while the folding door 100 is being opened, while the first pivot stop 901 and the second pivot stop 902 are provided. It is sufficient if the structure is such that the distance between them is always widened.

That is, the first link 92 and the second link 9
3. Instead of the first urging body 95, a torsion coil spring or a gas spring is used to pivotally lock one end to the first pivot point 901 and the other end to the second pivot point 902. However, the object of the present invention can be achieved. Further, in the above-described embodiment, since the compression spring is used for the first urging body 95, one end of the mandrel is connected to the second link 94 in order to prevent the compression spring from becoming arcuate when the second door 3 moves. On the other hand, it may be rotatable and the other end may be disposed in the compression spring so as to be rotatable and slidable on the first link 92.

In the rammer panel 10, an upward locking protrusion (not shown) formed on the upper end is locked inside the upper frame 12 of the three-way frame 1, and both ends of the opening / closing side are opened / closed vertical frames 11. The inner surface of 11 is detachably mounted by screwing it onto a rammer mounting seat (not shown) that projects in the opening / closing direction.

[0036]

According to the invention described in claim 1, it is possible to obtain a folding door having a simple structure and being easy to use.

[0037]

According to the second aspect of the invention, in addition to the above effect, the opening / closing assisting member has a first link whose end is pivotally fixed to the fixing member and one end of which is pivotally connected to the other end of the first link. Stopped,
Since the other end is composed of a second link pivotally fixed to the second door side and a first urging body that always urges the first link and the second link in the opening direction, the number of parts is small and the assembly is performed. Is easy and can be manufactured at low cost.

According to the invention of claim 3, claim 2
In addition to the above configuration, a second urging body that always urges the second door in the closing direction is provided, and the urging force of the first urging body is set to be stronger than the urging force of the second urging body. By setting the biasing force of the biasing body to be weak, it will not be suddenly opened when fully opened, and the opening movement can be automatically performed smoothly.

[0040]

[0041]

[0042]

According to the fourth aspect of the present invention, when the folding door is opened to some extent, it is fully opened afterward, and when it is closed to a predetermined position, it is automatically fully closed afterwards. It is easy to use, there is little risk of damage or deformation of the sliding part even if an operating force is applied in the in / out direction, and even if it is used for many years, there is no danger of the folding door descending and coming into contact with the floor surface. It is the best folding door for wheelchair users.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of the present invention.

FIG. 2 is a front view of the present invention.

FIG. 3 is an enlarged sectional view taken along line AA of FIG.

FIG. 4 is an enlarged view of part B of FIG.

FIG. 5 is an exploded perspective view of a slide support member and a support fitting part.

FIG. 6 is an enlarged sectional view of a slide member.

FIG. 7 is an explanatory view showing an operating state of the opening / closing assisting member.

[Explanation of symbols]

1 three-sided frame 11 vertical frames 100 folding doors 2 first door 3 second door 4 Support bracket 46 Mating shaft 5 Slide support member 6 fixing members 7 First slide rail 700 slide member 8 Second slide rail 9 Opening / closing auxiliary member 901 First pivot point 902 Second pivot point 92 First link 94 Second link 95 First urging body 96 Second urging body

Claims (4)

(57) [Claims] 1. A first end having an open end rotatably supported.
A folding door formed of a door and a second door that is foldably connected to the first door and has an upper portion slidably supported in the opening / closing direction with respect to a fixing member, and the folding door is opened from a fully closed position to a predetermined position. From the time point, the second door is urged in the opening direction, and from the time point when the folding door is closed from the fully opened position to the predetermined position, the opening / closing assisting member for urging the second door in the closing direction is provided on the fixing member side and the second side. placed folding Re door provided over between the door side
The opening and closing assist member has one end at the first pivot point on the fixed member side.
And has a second pivot point on the second door side, and the second pivot point is broken.
It is located on the closed side of the first pivot point in the closed position of the door,
It is located on the opening side of the first pivot point during the opening of the folding door.
While the distance between the first pivot point and the second pivot point is
A folding door characterized by being constantly biased in the direction in which it can be opened. 2. The opening / closing assisting member has an end portion on the side of the fixing member.
A first link pivotally secured to the first link and one end at the other end of the first link
Is pivoted and the other end is pivoted to the second door side.
And always urges the first and second links in the opening direction.
A first urging body is included, and the first urging body is included.
Folding door as claimed in. 3. The opening / closing assisting member has a first link whose end is pivotally fixed to the fixing member side, one end is pivotally fixed to the other end of the first link, and the other end is pivotal to the second door side. a second link is locked, the first link and the first biasing body for urging always open direction of the second link, made of a second biasing member that biases the second door always in the closing direction, The urging force of the first urging body is stronger than the urging force of the second urging body.
Folding door described in. 4. A first end having an open side end rotatably supported.
A door, a second door foldably connected to the first door and slidably supported by a slide support member formed on a slide member having an upper portion disposed on the fixing member via a support fitting; The second door is urged in the opening direction from the time when the two doors are opened from the fully closed position to the predetermined position, and the second door is urged in the closing direction from the time when the two doors are closed from the fully opened position to the predetermined position. In a folding door constituted by an opening / closing assisting member, the opening / closing assisting member has a first link whose end is pivotally fixed to a fixing member, and one end is pivotally stopped at the other end of the first link and the other end is 2nd, which is pivotally attached to the slide support part side of 2 doors
The first urging body includes a link, a first urging body that always urges the first link and the second link in the opening direction, and a second urging body that always urges the second door in the closing direction. Is configured to be stronger than the biasing force of the second biasing body, and the support fitting can adjust the mounting position of the second door in the vertical direction with respect to the slide supporting member, and cannot rotate with the slide supporting member. Only the two doors are rotatably connected, and the slide member has the same shape as the first slide rail vertically arranged on the fixing member and is horizontally arranged on the fixing member. And a second slide rail, wherein the slide support member is formed over the first slide rail and the second slide rail.