KR101745401B1

KR101745401B1 - Folding Door

Info

Publication number: KR101745401B1
Application number: KR1020150045079A
Authority: KR
Inventors: 홍성주
Original assignee: (주)이지폴딩
Priority date: 2015-03-31
Filing date: 2015-03-31
Publication date: 2017-06-12
Also published as: KR20160116806A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding door, that is, a folding door, and more particularly, to a folding door that can be installed directly on a folding door without removing the window frame.
The folding door according to the present invention is characterized in that the folding door according to the present invention comprises a lower cover that covers a lower frame of a window frame for a sliding door and has an upper flat surface, an upper cover that covers the upper frame of the sliding window frame, A cover frame including a side cover covering the frame; A lower frame for a folding door provided at an upper portion of the lower cover, a lower frame for a folding door provided at a lower portion of the upper cover, and an upper frame for the folding door, A window frame for a folding door including a side frame for a folding door; A plurality of doors; And a lower roller hinge including a hinge coupled to a lower portion of the door and a roller portion connected to the hinge portion and moving along the lower rail.

Description

Folding Door which can be installed directly on a window frame for sliding doors

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding door, and more particularly, to a folding door that can be installed directly on a sliding window without removing the window frame.

Generally, Folding Door refers to a folding door literally, which can be used for replacing the inner and outer walls of a building wall. It is durable in response to mechanical external force. It is also suitable for external use due to its soundproof and windproof effect. . In addition, it is possible to secure the field of view by applying glass to the product, and it is also used for internal use because of its excellent design.

And folding doors open more than 90% of 50% of the existing doors in order to utilize the valuable space, so it provides a wide living space for residential use and facilitates customers' It is a tendency to be used for entrance or exit of houses, shops, and so on.

1 to 4, a conventional folding door includes a door frame 100, a plurality of doors 200, a lower roller hinge 300, an upper roller hinge 400, a middle hinge hinge 500 A fixed hinge hinge 600, and a movable frame 700. The movable frame 700 includes a movable frame 700,

The door frame 100 includes a lower frame 120, an upper frame 110, and a side frame including a left frame 130 and a right frame 140, And the lower rail 121 is formed. Further, the upper frame 110 is opened at the lower part and the upper rail is formed.

The door 200 is folded as one side moves along the door frame 100. The door 200 is composed of a door glass 220 or the like which is fitted in a door frame 210 having a quadrangular shape do.

A lower roller hinge 300 including a hinge coupled to the lower portion of the door 200 and a roller portion moving along the lower rail 121, a hinge coupled to the upper portion of the door 200, And an upper roller hinge (400) including a roller portion that moves along the axis. The hinge part of the lower roller hinge 300 and the upper roller hinge 400 are connected to the door 200 and the door 200 or the door 200 and the moving frame 700, respectively. This will be described later.

The middle hinge hinge 500 is coupled to the other side of the door 200 to which the lower roller hinge 300 and the upper roller hinge 400 are not coupled, and when the door 200 is folded, 0.0 > 100). &Lt; / RTI >

The fixed hinge hinge 600 is coupled to the left frame 130 and one side of the door 200 facing the left frame 130 so that the door 200 is folded.

The moving frame 700 is a component adjacent to the right frame 140 by being hinged to one side of the door 200 adjacent to the right frame 140 among the side frames. The upper roller hinge 400 and the lower roller hinge 300 are coupled to the upper and lower portions of the movable frame 700 and the door 200, respectively.

The locking protrusions 131 and 213 are formed on the opposite sides of the left frame 130 and the door frame 210 of the door 200 adjacent to the left frame 130, A coupling protrusion 213 is formed on the opposite side of the door frame 210 to which the intermediate hinge hinge 500 is coupled. On the opposite sides of the moving frame 700 and the door frame 210 adjacent thereto, The engaging protrusions 710 and 213 are formed to engage the hinge 300 and the upper roller hinge 400. [

The movable frame 700 and the door frame 210 opposed to each other and the movable frame 700 are disposed between the left frame 130 and the opposite door frame 210, between the door frames 210, And a door packing 800 is provided between the right frame 140 and the right frame 140, respectively. A door packing 800 is provided on both sides between the moving frame 700 and the right frame 140 so that two pairs of door packing 800 are interposed.

That is, the side frames 130 and 140, the door frame 210, and a pair of door packings 800 are provided to face each other on opposite sides of the moving frame 700 for soundproofing and windshielding. 4, a pair of door packings 800 are provided with concave portions 820 and convex portions 810 on opposite sides thereof, respectively, and one side concave portion 820 and the other side convex portion 810 And the one side convex portion 810 and the other side concave portion 820 are in contact with each other, thereby improving the soundproofing and windproof effect as well as the rainwater blocking effect.

In addition, a packing fixing part 132, 141, 214, 720 is provided on the side wall of the left frame 130, the right frame 140, the door frame 210 and the moving frame 700 so that the door packing 800 can be fixed. 800 are provided with fixing protrusions 830 on the back surfaces of the contact surfaces to fix the fixing protrusions 830 to the packing fixing portions 132, 141, 214,

Referring to FIG. 5, the lower roller hinge 300 includes a roller portion 320 provided at a lower portion of the support column 310 and a hinge portion 330 provided at the side of the support column 310. The hinge portions 330 are respectively coupled to the door frame 210 or the movable frame 700 of the door. More specifically, the pair of hinges 330 coupled to the support pillars 310 are respectively inserted into the door frame 210 and the engaging projections 213 and 710 formed on the moving frame 700, 331 are formed.

The roller unit 320 includes a driving roller 322 rotatably mounted on both sides of the body 312 and a first guide roller 323 rotatably mounted on the body 321 do. That is, the first guide roller 323 is mounted on the upper portion of the driving roller 322. Therefore, the bottom surface of the first guide roller 323 is positioned higher than the upper surface of the driving roller 322.

Referring to FIG. 6, the upper roller hinge 400 includes a body body 20 provided at an upper portion of the support column 310, and a hinge portion 430 provided at the side of the support column 410. The hinge portions 430 are respectively coupled to the door frame 210 or the movable frame 700 of the door. More specifically, the pair of hinges 430 coupled to the support pillars 410 are respectively inserted into the door frame 210 and the engaging projections 213 and 710 formed on the moving frame 700, 431 are formed.

And a second guide roller 323 rotatably provided at a lower portion of the body 420.

Referring to FIG. 7, a lower roller hinge is coupled to a lower portion of the door 200, and an upper roller hinge is coupled to an upper portion of the door. The driving roller 322 of the lower roller hinge is installed to be seated on the lower rail 121 of the lower frame 120. Thereby causing the drive roller 322 to fold the door 200 in rolling contact along the lower rail 121. At this time, the first guide roller 323 slides along the upper opening of the lower frame 120. That is, when the driving roller 322 comes into rolling contact and folds the door 200, the first guide roller 323 smoothly folds the door 200 without friction, while balancing the door 200 so that it does not tilt.

The second guide roller 421 of the upper roller hinge is inserted into the upper frame 110 opened at the bottom and the second guide roller 421 moves along the inner wall of the upper rail 111. The second guide roller 421 of the upper roller hinge can maintain the vertical state without tilting when the door 200 moves, and smoothly fold without friction.

8 shows a state in which the lower roller hinge 300 of the lower frame 120 is mounted. A roller portion 320 is inserted into the lower frame 120 and a lower portion of the door frame 210 is coupled to the hinge portion 330 at the upper portion of the lower frame 120.

In other words, the driving roller 322 of the roller portion 320 inserted into the lower frame 120 is seated on the lower rail 121. The first guide roller 323 is installed to move along an opening formed in the upper portion of the lower frame 120, that is, an opening formed between the opposed upper covers 122.

Referring to FIG. 9, the driving roller 322 moves along the lower rail 121 which is the bottom surface of the lower frame 120. The first guide roller 323 is positioned at an opening formed between the upper lid 122 of the lower frame 120 and guided by the upper lid 122.

Therefore, since the first guide roller 323 is provided on the driving roller 322, the height (thickness) of the lower frame 120 is thick. That is, the bottom surface of the first guide roller 323 is installed higher than the upper surface of the drive roller 322. Accordingly, the lower frame 120 is fixed to the concrete floor G, and the upper frame 120 is treated with the finishing material G1.

Therefore, it is possible to install a folding door after crushing and dismantling the existing concrete floor, inserting the lower frame 120, pouring and fixing concrete mortar again. This is because, when installed directly on the floor without being installed in the floor, the height of the lower frame is high, resulting in a bad appearance and an accident that falls over while driving.

However, it takes a lot of time and cost to dismantle the concrete floor and pour the concrete again, and it is difficult to work. In particular, there is a problem in that the work must be stopped during curing of the concrete since the concrete must be cured sufficiently before the construction.

On the other hand, as described above, there is a case in which a concrete floor is removed and a folding door is constructed. However, a folding door may be installed at a position where a sliding window such as a chassis is installed.

10 shows a conventional sliding window.

As shown in the figure, the sliding window includes a sliding window frame and a pair of sliding doors S200. The door S200 includes a rectangular door frame S210 and a door glass S220.

The sliding window frame is composed of a lower frame S120, an upper frame S110 and a pair of side frames S130 and S140.

Further, a pair of sliding rails (S121) parallel to each other are protrudingly formed on the lower frame (S120) so that a pair of sliding doors (S200) slide left and right. Corresponding to this, a mounting groove S211 is formed on the bottom surface of the door frame S210 so that the sliding rail S121 is seated. Accordingly, the sliding door (S200) opens and closes the window while sliding along the sliding rail (S121) to the left and right.

A method of removing a conventional sliding window constructed as described above and installing a folding door at the position will be described. First, the sliding door S200 is removed from the sliding window sills S110 to S140, and the sliding window sills S110 to S140 are removed. After the sliding window frames (S110 to S140) are all removed, a window frame frame for a folding door is installed and a plurality of doors are mounted.

That is, after the sliding window frames (S110 to S140) are removed, the window frame frame for the folding door must be fixed. The process will be described in more detail with reference to FIG.

11 (a), the lower frame S120 of the sliding window frame is removed, and the lower frame 120 for the folding door is inserted into the lower frame S120. Since the sash frame for the folding door is narrower than the window frame for the sliding door, the remaining space waits until the concrete mortar (CM) is laid and hardened. When the concrete mortar CM is cured and the lower frame 120 is fixed to the floor, the lower roller 120 is fitted with a driving roller ('322' in FIG. 7) of the lower roller hinge inserted therein.

Next, as shown in Fig. 11 (b), the side frame S130 of the sliding window frame is demolished, and the demolished empty space is filled with concrete mortar CM to finish the same as the surface of the wall W And wait until it is cured. When the concrete mortar CM is cured, the side frame 130 for the folding door is fixed thereon. The side frame 130 for the folding door is fixed to the wall W using a screw or a bolt.

Next, as shown in FIG. 11C, the upper frame S110 of the window frame for sliding doors is demolished, and the demolished empty space is filled with concrete mortar CM to finish the same as the surface of the ceiling R And wait until it is cured. When the concrete mortar CM is cured, the upper frame 110 for the folding door is fixed thereon. The upper frame 110 for the folding door is fixed to the ceiling R by means of screws or bolts. When the concrete mortar CM is cured and the upper frame 110 is fixed, a second guide roller ('421' in FIG. 7) of the upper roller hinge is inserted into the upper rail 111 formed in the upper frame 110 .

However, as described above, in order to remove the sliding window and install the folding door at the place where the sliding window is installed, it is difficult to remove the sliding window window.

Particularly, there is a problem that the construction time is very long since the window frame for the folding door is installed in the demolished space and the folding door can be installed after waiting until the concrete mortar is poured and hardened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a folding door in which a window frame for a sliding door can be installed without removing the window frame.

According to an aspect of the present invention, there is provided a folding door comprising: a lower cover that covers a lower frame of a window frame for a sliding door, the upper surface of which is flat; an upper cover that covers an upper frame of the sliding window frame; A cover frame including a side cover covering the side frame; A lower frame for a folding door provided at an upper portion of the lower cover, a lower frame for a folding door provided at a lower portion of the upper cover, and an upper frame for the folding door, A window frame for a folding door including a side frame for a folding door; A plurality of doors; And a lower roller hinge including a hinge coupled to a lower portion of the door and a roller portion connected to the hinge portion and moving along the lower rail.

It is preferable that the lower cover further includes a reinforcing member for reinforcing the strength to support the load of the door.

Further, a pair of sliding rails parallel to each other is protruded from the lower frame of the sliding window frame, and the reinforcing member is preferably formed between the pair of sliding rails.

Preferably, the lower frame for the folding door is formed with an anti-lock plate extending downward from the upper ends of the side walls toward the outside.

The roller portion may include a body to which the hinge portion is coupled; And a driving roller provided on the body and moving along a bottom surface of the lower rail.

And a first guide roller coupled to the body and disposed forward or rearward of the drive roller.

Preferably, the first guide roller has a rotation axis orthogonal to the rotation axis of the drive roller.

The first guide roller is preferably guided along the inner wall of the lower rail.

The upper surface of the first guide roller may be lower than or equal to the upper surface of the driving roller, and the lower surface of the first guide roller may be higher than or equal to the lower surface of the driving roller.

The upper frame for the folding door is provided with an upper rail, a hinge for engaging the upper portion of the door, and a second guide roller connected to the hinge and moving along the inner wall of the upper rail. It is preferable to further include a hinge.

It is preferable that the lower frame and the lower cover of the sliding window frame, the upper frame and the upper cover of the sliding window frame, and the side frame and the side cover of the sliding window frame are coupled by fastening means.

It is preferable that the lower cover, the lower frame for the folding door, the upper frame for the upper cover and the upper frame for the folding door, and the side frame and the side frame for the folding door are coupled by fastening means, respectively.

According to the present invention, there is an effect that the folding door can be installed directly on the window frame without removing the window frame for a sliding door.

Therefore, the working time and cost for removing the window frame for the sliding door can be reduced.

Furthermore, the finishing work after the folding door is installed at the place where the sliding window frame is removed, for example, the floor construction such as concrete pouring, plastering, coating, flooring and flooring is unnecessary, do.

1 is a front view of a conventional folding door.
FIG. 2 is a perspective view of the folding door shown in FIG. 1; FIG.
3 and 4 are plan views of the folding door shown in Fig.
Figure 5 shows the lower roller hinge of the folding door shown in Figure 2;
Figure 6 shows the upper roller hinge of the folding door shown in Figure 2;
FIG. 7 shows the installation state of the lower roller hinge and the upper roller hinge shown in FIG. 2;
Figs. 8 and 9 show a state in which the lower roller hinge shown in Fig. 2 is installed in the lower frame.
10 shows a general sliding window.
Fig. 11 shows a method of removing the sliding window of Fig. 10 and installing a folding door.
12 shows a folding door according to the present invention.
Fig. 13 shows a state in which a cover frame is installed on a window frame for a conventional sliding door.
14 to 16 show the lower roller hinge, the lower frame and the lower cover.
17 shows a state in which a cover frame and a window frame for a folding door are installed in a conventional window frame for a sliding door.
18 shows another embodiment of the lower cover according to the present invention.

Hereinafter, the configuration and operation of the folding door according to the present invention will be described in detail with reference to the accompanying drawings.

12 and 13, a folding door 1 according to the present invention is a folding door that can be installed directly on a window frame for a sliding door without removing the window frame. The sliding door frame 1 is composed of sliding window frames S110 to S140, The window frames F110 to F140 for folding doors to be seated or coupled to the cover frames C110 to C140 and the window frames F110 to F140 for covering the window frames S110 to S140, A lower roller hinge 30, and an upper roller hinge (not shown).

The cover frames C110 to C140 include a lower cover C120 for covering the lower frame S120 of the sliding window frames S110 to S140 and an upper cover C110 for covering the upper frame S110 of the sliding window frame, And side covers C130 and C140 that cover the side frames S130 and S140 of the sliding window frame.

The window frame frames F110 to F140 for the folding door are provided on the upper portion of the lower cover C120 and include a lower frame F120 for the folding door on which the lower rail F121 is formed, And folding door side frames F130 and F140 connected to the left and right sides of the lower frame F120 and the upper frame F110, respectively.

The door 200 is composed of a rectangular door frame and a door glass, and a fixed hinge hinge (600 'in FIG. 4) is coupled to the lower portion and the upper portion of the door frame adjacent to the left side frame F130. A middle hinge hinge ('500' in FIG. 4) is coupled to the upper and lower portions of the pair of doors 200 and a moving frame (700 'in FIG. 4) is coupled to the right side of the right door 200 Respectively. Upper and lower portions of the right door frame are provided with upper roller hinges ('400' in FIG. 6) and lower roller hinges 30, respectively.

Therefore, the lower part of the upper frame S110 of the sliding window frame is covered with the upper cover C110, and the upper frame F110 for the folding door is coupled thereunder. An upper rail F111 is formed on the folding door upper frame F110 and a second guide roller 421 'is installed on the upper rail F111. For reference, the upper frame F110 and the upper roller hinge for the folding door may have the same configuration as the conventional upper frame 110 and the upper roller hinge 400 shown in Figs. 6 and 7.

Further, the upper part of the lower frame S120 of the sliding window frame is covered with the lower cover C120, and the lower frame F120 for the folding door is coupled thereto. Here, a lower rail F121 is formed in the lower frame F120 for the folding door. This will be described later.

One side of the side frames S130 and S140 of the sliding window frame is covered with side covers C130 and C140 and the folding door side frames F130 and F140 are coupled to the side frames C130 and C140. Here, the folding door side frames F130 and F140 may have the same configuration as the conventional side frames 130 and 140 shown in Figs.

Referring to Fig. 14, the lower roller hinge 30 according to the present invention includes a hinge 33 and a roller portion 32. Fig.

The hinge part 33 is a component that is coupled to the lower part of the door 200 and is foldable as in the prior art. The hinge part 33 is provided with support pillars 31 for coupling to the roller part 32.

The roller portion 32 is a component connected to the hinge portion 33 and moving along the lower rail 41.

Particularly, the roller unit 32 includes a body 32a coupled with the support column 31, a driving roller 32c provided at the bottom of the body 32a and moving along the lower rail F121, And a first guide roller 32b.

A coupling hole ('32d' in FIG. 16) is formed at the center of the body 32a to engage with the support column 31.

Drive rollers 32c are provided at the front and rear of the coupling hole 32d, respectively.

The first guide roller 32b guides the movement of the driving roller 32c along the lower rail F121 of the lower frame 40. The first guide roller 32b is rotatably supported by the body 32a, but they are provided in front of and behind the driving roller 32c, respectively.

The rotation axis of the driving roller 32c is horizontally disposed, but the rotation axis of the first guide roller 32b is vertically installed. Therefore, the rotation axis of the first guide roller 32b is orthogonal to the rotation axis of the drive roller 32c.

The first guide roller 32b does not contact the inner wall F122 of the lower rail F121 when the driving roller 32c rolls vertically against the lower rail F121. However, if the driving roller 32c is not vertical, the door 200 is inclined. At this time, the first guide roller 32b contacts the inner wall F122 of the lower rail F121, To prevent it from tilting.

The upper surface of the first guide roller 32b may be lower than the upper surface of the driving roller 32c. 5, since the first guide roller 323 is provided on the upper portion of the driving roller 322, the upper surface of the first guide roller 9323 is positioned higher than the upper surface of the driving roller 322 Respectively. Therefore, in the prior art, the height (thickness) of the lower frame 120 must be high.

However, in the case of this embodiment, the first guide roller 32b is provided at the front and rear of the drive roller 32c, not at the top or bottom.

With this configuration, the height of the lower frame F120 is significantly lower than that of the prior art.

15 and 16, a lower cover C120 according to the present invention is a component for covering a lower frame S120 of a window frame for a sliding door, the upper cover C120 being made of a flat plate material and having both side ends C124, And a reinforcing member C121 is formed at a lower portion thereof. The reinforcing member C121 is a component reinforcing the strength to support the load of the door 200. In the present embodiment, the reinforcing member C121 has a hollow tube at the lower portion of the plate- Respectively.

A through hole h is formed in the lower cover C120 and the reinforcing member C121 is screwed to the lower frame S120 of the sliding window frame through the through hole h.

A lower frame F120 for a folding door is seated on the upper portion of the lower cover C120. The lower frame F120 for the folding door includes a lower rail F121 on which the driving roller 32c of the lower roller hinge is seated . The first guide roller 32b of the lower roller hinge 30 is guided along the inner wall F122 of the lower rail.

The lower frame F120 for the folding door is formed with an anti-lock plate F123 extending downward from the upper ends of both side walls. This is because the folding door lower frame F120 is not buried and protrudes from the lower cover C120, so that it may be caught by the side wall of the folding door lower frame F120 while a person is traveling and may be injured. .

A method of installing the folding door according to the present invention will be described with reference to FIG.

First, referring to Fig. 17 (a), the lower frame C120 of the sliding window frame is covered without covering the lower frame S120. The lower cover C120 is supported by a pair of sliding rails (S121 'in Fig. 12) formed in the sliding door lower frame S120, and a reinforcing member (Fig. 15 Lt; / RTI > of C121). In this state, the screw B2 is fastened to the reinforcing member (C121 in Fig. 15) through the through hole ('h' in Fig. 15) to connect the sliding lower frame S120 and the lower cover C120 Fixed. In this state, the folding door lower frame F120 is seated on the upper surface of the lower cover C120 and the screws B1 as the fastening means are fastened to fasten the lower frame F120 and the lower cover C120. Next, the door 200 to which the lower roller hinge 30 is coupled is mounted on the lower rail F121 formed on the lower frame F120. Silicone or the like is filled between the folded both side ends C124 of the lower cover C120 and both side ends S125 of the lower frame S120 of the sliding window frame. 'G' is the floor, and 'G1' such as the floorboard or floorboard is the flooring material.

Referring to Fig. 17 (b), the side frame S130 of the sliding window frame is not removed, and the side cover C130 is covered thereon. In this state, the screw B4 is fastened to the reinforcing member C131 to fix the side cover C130 to the sliding side frame S130. In this state, the side frame F130 for the folding door is seated on the side cover C130 and the side frame F130 is fastened by fastening the screw B3 to fasten the side frame F130 and the second engaging plate C132. Fixed.

17 (c), the upper frame S110 of the sliding window frame is not removed, but the upper cover C110 is covered below the upper frame S110. In this state, the screw B6 is fastened to the reinforcing member C111 to fix the upper cover C110 to the sliding upper frame S110. In this state, the upper frame F110 for the folding door is seated on the upper cover C110 and the screw B5 is fastened to fasten the upper frame F110 and the second engaging plate C132 to connect the upper frame F110 Fixed. Next, a door coupled with an upper roller hinge is mounted on the upper rail F111 formed on the upper frame F110.

The screws B1 to B6 can be replaced by other known fastening means.

18 shows another embodiment according to the present invention. As shown in the figure, it can be seen that the both side ends C125 of the lower cover C120 completely surround the outside of the side edge S125 of the window frame for the sliding door. 17 (a). Therefore, a duplicate description will be omitted.

1: Folding door
S110 to S140: Window frames for sliding doors
C110 to C140: Cover frame
F110 ~ F140: Window frame frame for folding door
30: Lower roller hinge
31: support column
32: roller portion
32a: Body
32b: guide roller
32c: drive roller
32d: Coupling hole
33:

Claims

A cover frame including a lower cover that covers a lower frame of the sliding window frame and has an upper flat surface, an upper cover that covers the upper frame of the sliding window frame, and a side cover that covers the side frames of the sliding window frame;
A lower frame for a folding door provided at an upper portion of the lower cover, a lower frame for a folding door provided at a lower portion of the upper cover, and an upper frame for the folding door, A window frame for a folding door including a side frame for a folding door;
A plurality of doors; And
A lower roller hinge including a hinge coupled to a lower portion of the door and a roller portion connected to the hinge portion and moving along the lower rail,
Wherein the lower frame for the folding door is formed with an anti-lock plate extending downward from the upper end of the side walls toward the outside,
The roller unit
A body to which the hinge portion is coupled;
A driving roller provided on the body and moving along a bottom surface of the lower rail; And
And a first guide roller coupled to the body so as to be positioned in front of or behind the driving roller and guided along the inner wall of the lower rail with a rotation axis orthogonal to the rotation axis of the driving roller,
The upper surface of the first guide roller is lower than or equal to the upper surface of the drive roller,
Wherein a bottom surface of the first guide roller is installed higher than or equal to a bottom surface of the drive roller.

The method according to claim 1,
And a reinforcing member for reinforcing the load to support the load of the door is further provided at a lower portion of the lower cover.

3. The method of claim 2,
Wherein a pair of sliding rails parallel to each other are protruded from the lower frame of the sliding window frame, and the reinforcing member is formed between the sliding rails for the pair of sliding doors.

delete

The method according to claim 1,
An upper rail is formed on the upper frame for the folding door,
Further comprising an upper roller hinge including a hinge coupled to an upper portion of the door and a second guide roller connected to the hinge and moving along an inner wall of the upper rail.

The method according to claim 1,
Wherein the lower frame and the lower cover of the sliding window frame, the upper frame and the upper cover of the sliding window frame, and the side frame and the side cover of the sliding window frame are engaged by fastening means, respectively.

The method according to claim 1,
Wherein the lower cover, the lower frame for the folding door, the upper frame for the upper cover, the upper frame for the folding door, and the side frames and the side frames for the folding door are engaged by fastening means.