KR20100120034A - Sliding door assembly - Google Patents

Abstract

PURPOSE: A sliding door assembly is provided to automatically open and close a door and to reduce working shock and working noise due to opening/closing operation. CONSTITUTION: A sliding door assembly(1) comprises a door sash(100), a door(200), an elastic closing portion, and a shock absorbing portion. The door sash is formed with an opening(110). The door sash comprises hanger rails(120,130,140) and a side sash(160). The hanger rail is placed on the top of the opening. The side sash is placed on both sides of the opening. The door comprises hanger rollers(210,220,230) and plate-shaped partial doors(240,250,260). The hanger roller slides along the hanger rail. The plate-shaped partial doors are coupled with the hanger roller. The plate-shaped partial door opens and closes the opening according to slide movement. The elastic closing portion elastically presses the door.

Description

Sliding door assembly

The present invention relates to a sliding door assembly, and more particularly, to a sliding door assembly capable of automatically closing a door and reducing operating shock and operating noise and operating noise according to the opening and closing operation.

      In general, the door assembly is installed in the partitioned space. The door assembly is divided into a sliding door assembly and a sliding door assembly according to the opening and closing method. The sliding door assembly slides the door to open and close the opening, and the sliding door assembly rotates the door to open and close the opening.

      Generally, sliding door assemblies are mounted between the front door and the living room and between the living room and the balcony. The conventional sliding door assembly includes a door chassis forming an opening, and partial doors that open and close the opening by dividing the opening into a plurality of areas.

However, such a conventional sliding door assembly requires the user to grip and press the partial doors directly in order to close the door. In addition, when the user presses the door forcibly during the closing operation of the door, there is a problem in that operation shock and operation noise are severely generated.

The problem to be solved by the present invention is to provide a sliding door assembly which can automatically close the door, and can reduce the operating shock and operation noise according to the opening and closing operation.

      The problem to be solved in accordance with the present invention, in the sliding door assembly, and forming an opening, the door chassis having a hanger rail disposed on top of the opening and side chassis disposed on both sides of the opening; A door part having a hanger roller that slides with respect to the hanger rail, and a plate-shaped door coupled to the hanger roller to open and close the opening in accordance with the slide movement of the hanger roller and having a locking protrusion formed thereon; An elastic closure part coupled to the locking protrusion to elastically press the door in a closing direction; It is achieved by including a buffer for contacting the hanger roller elastically deformed during the closing movement of the door and providing a resistance to the closing movement of the door.

       The elastic closing portion, the engaging ring coupled to the locking projection; A spring that provides an elastic force to the locking ring in the closing direction of the door; It may include a spring support wheel for supporting the spring.

       The elastic closure part may further include an elastic force control unit for adjusting the elastic force of the spring.

       The elastic force control unit, the head portion having a non-circular shape and rotates with the spring support wheel; It may include a stopper for pressing the outer peripheral surface of the head portion to prevent rotation.

       Preferably, the elastic closure part has a large elastic force as compared with the buffer part.

       The buffer part is mounted to the inner upper wall surface of the hanger rail, bent downward along the closing direction of the door is preferably provided with a leaf spring for pressing the hanger roller.

       The door includes at least a first partial door, a second partial door, and a third partial door sequentially arranged in an opening direction to divide and open the opening; A pair of pulleys spaced apart in the opening and closing direction on the upper portion of the second partial door, a belt coupled to the pair of pulleys, and a moving force of the belt is controlled by the first partial door and the third partial door. It may further include an interlock having a coupling member for transmitting to.

       The pair of pulleys are preferably spaced apart from each other at least one width of the first partial door and the third partial door.

       The hanger rail may further include an outside air blocking unit disposed in an upper region between the first partial door and the second partial door and between the second partial door and the third partial door.

The elastic closure portion is characterized in that provided on the hanger rail.

According to the present invention, it is possible to automatically close the door, it is possible to provide a sliding door assembly that can reduce the operating shock and operation noise according to the opening and closing operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification. For convenience of description, the side on which the first hanger rail 120 to be described later is formed is called 'front', and the side on which the third hanger rail 140 is formed is designated as 'rear'.

1 is a perspective view showing a schematic configuration of a sliding door assembly according to a preferred embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line AA 'of Figure 1, Figure 3a is a sliding door according to a preferred embodiment of the present invention 3 is a longitudinal cross-sectional view showing an operating structure of a sliding door assembly according to a preferred embodiment of the present invention, Figure 4a is an automatic closing of the sliding door assembly according to a preferred embodiment of the present invention Figure 4b is an exploded perspective view of the automatic closing member of the sliding door assembly according to a preferred embodiment of the present invention, Figure 5a is a closed state of the door of the operating state of the sliding door assembly according to a preferred embodiment of the present invention 5B is a cross sectional view of the sliding door assembly according to a preferred embodiment of the present invention in an open state during operation; It is a cross-sectional view which shows the state.

First, a sliding door assembly 1 according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5B.

The sliding door assembly 1 according to the present embodiment includes a door chassis 100, a door part 200, an elastic closing part 420, and a buffer part 430.

The door chassis 100 is installed on the wall of the building structure to form an opening 110 which is a moving passage opened and closed by the door part 200. Although the door chassis 100 is shown as forming a rectangular opening 110 in the present embodiment, it is also possible to form a polygonal or circular opening other than the rectangular shape. In this case, the shape of the door part 200 is changed to correspond to the shape of the opening.

The door chassis 100 may be provided with various materials such as wood, plastic, aluminum, and steel.

The door chassis 100 includes a hanger rail 120, 130, 140 disposed on the ceiling of the building structure, that is, the upper portion of the opening 110, and side chassis 160 disposed on both sides of the opening.

As shown in FIG. 2, the hanger rails 120, 130, and 140 have a first hanger rail 120 and a second hanger rail 130 for guiding a slide movement of the hanger rollers 210, 220, 230 described later. And a third hanger rail 140. Here, the 1st hanger rail 120, the 2nd hanger rail 130, and the 3rd hanger rail 140 are arrange | positioned sequentially from the front.

The first hanger rail 120 is bent in a direction approaching each other from both free ends of the first leg body 121 and the first leg body 121 having an inverted 'U'-shaped longitudinal section shape. And a first roller guide 123 for supporting the roller 210 and guiding the slide movement.

Like the first hanger rail 120, the second hanger rail 130 has a second leg body 131 and a second roller guide 133, and the third hanger rail 140 has a third leg body 141. ) And a third roller guide 143.

At this time, the hanger rails (120, 130, 140) is a one-touch detachable easy to remove the door can be configured in each hanger rail removable.

On the other hand, the second hanger rail 130 has a higher upper wall surface than the first hanger rail 120 and the third hanger rail 140. That is, the height of the inner space of the second hanger rail 130 is higher than the first hanger rail 120 and the third hanger rail 140. A buffer unit 430 is installed on the inner upper wall surface of the second rinsing rail 130.

The side chassis 160 is disposed on both sides of the opening 110 and forms sidewalls of the door chassis 100. Each side chassis 160 contacts the side walls of the first partial door 240 and the third partial door 260 which will be described later in the closed state of the opening 110.

The door chassis 100 of the sliding door assembly 1 according to the present embodiment may further include a lower chassis 170 for accommodating the lower regions of the doors 240, 250, and 260 to guide the slide movement. The lower chassis 170 not only guides the slide movement of the partial doors 240, 250, and 260, but also serves to block outside air from penetrating into the room.

The door part 200 is coupled to the hanger rollers 210, 220, 230 and the hanger rollers 210, 220, 230 that slide with respect to the hanger rails 120, 130, 140. It includes a plate-shaped partial doors 240, 250, 260 to open and close the opening in accordance with the slide movement of 230.

The hanger rollers 210, 220, and 230 are accommodated in the first hanger rail 120, the second hanger rail 130, and the third hanger rail 140, respectively. The hanger roller 220 and the third hanger roller 230 is included. The first hanger roller 210, the second hanger roller 220 and the third hanger roller 230 are coupled to the first partial door 240, the second partial door 250 and the third partial door 260, respectively. It is.

The first hanger rollers 210 are coupled to the upper wall of the first partial door 240 and are provided in pairs to be spaced apart at predetermined intervals along the opening and closing direction of the first partial door 240.

In this embodiment, each of the first hanger rollers 210 includes four rollers 211, two roller shafts 213 for supporting the rollers 211, and a shaft support 215 for supporting the roller shafts 213. And a roller engaging portion 217 that couples the shaft support portion 215 to the upper wall of the first partial door 240.

The rollers 211 are arranged in pairs before and after each along the opening and closing direction of the first partial door 240. Each pair of rollers 211 are coupled by a roller shaft 213, and a bearing (not shown) may be interposed between the roller 211 and the roller shaft 213.

The shaft support part 215 connects and supports the pair of roller shafts 213. The shaft support portion 215 is provided with a bolt portion 215a protruding downward.

The roller coupling part 217 is coupled to the shaft support part 215 by the bolt part 215a, and is attached to the upper wall surface of the 1st partial door 240 by the fastening member, such as a rivet or a screw. Here, the first partial door 240 and the shaft support 215 is preferably coupled with a fastening strength that can withstand the load of the first partial door 240.

On the other hand, the roller coupling portion 217 is formed with a nut portion 217a to which the bolt portion 215a of the shaft support portion 215 is screwed, and the bolt portion 215a and the nut portion 217a are fastened to each other. Accordingly, the height of the first partial door 240 with respect to the hanger rails 120, 130, and 140 may be adjusted. Here, the first hanger roller 210 may employ the roller structure disclosed in Korea Utility Model Model No. 0379836. In addition, the roller coupling portion 217 may be configured with a nut portion 217a and a one-touch detachable type.

Since the third hanger roller 230 is also provided in the same structure as the first hanger roller 210, the description thereof will be omitted.

Meanwhile, as shown in FIGS. 3A and 3B, the second hanger roller 220 may further include an auxiliary roller 219 disposed in the center area of the shaft support part 225. The auxiliary roller 219 is rotatably provided in the same direction as the roller 221, and is arrange | positioned between each pair of rollers 221. As shown in FIG. The auxiliary roller 219 is provided higher than the roller 211 of the first hanger roller 210 described above, and rotates in contact with the plate surface of the buffer part 430 when the second partial door 250 moves.

The door may include a first partial door 240, a second partial door 250, and a third partial door coupled to the first hanger rail 120, the second hanger rail 130, and the third hanger rail 140, respectively. 260).

The first partial door 240 includes a first door frame 241 forming an edge of the first partial door 240 and a first door panel 245 provided in a central area of the first door frame 241. Have

The first door frame 241 may be made of various materials such as wood, plastic, aluminum, and steel. A gripping portion 242 for gripping a user may be provided on the front and rear surfaces of the first door frame 241. A locking protrusion 243 protrudes from an upper wall of the first door frame 241. The locking projection 243 is engaged with the locking ring 421 of the elastic closure 420 to be described later.

The first door panel 245 may be provided transparently, and a pattern may be formed in consideration of aesthetics. The first door panel 245 may be made of wood, glass, or plastic.

Meanwhile, the second partial door 250 and the third partial door 260 are also configured in the same manner as the first partial door 240. That is, the second partial door 250 and the third partial door 260 are respectively the second door frame 251 and the third door frame 261, the second door panel 255 and the third door panel 265. Has

In the closed state in which the door part 200 closes the opening 110 of the door chassis 100, the door frames 241, 251, and 261 overlap each other in the boundary area of each of the partial doors 240, 250, and 260. . That is, the other side of the first door frame 241 and one side of the second door frame 251 overlap, and the other side of the second door frame 251 and one side of the third door frame 261 overlap each other. It is.

One front side and the other rear side of the second door frame 251 may be provided with a brush-shaped windbreak member (not shown) provided along the vertical direction. That is, the windbreak member prevents the outside air from flowing into the room through the gap between the first door frame 241 and the second door frame 251 and between the second door frame 251 and the third door frame 261. It is.

In the present exemplary embodiment, the partial doors 240, 250, and 260 are provided with the door frames 241, 251, and 261 and the door panels 245, 255, and 265, but the present disclosure is not limited thereto. The 240, 250, and 260 may be provided as one panel member.

As shown in FIGS. 3A and 3B, the sliding door assembly 1 according to the present embodiment is provided in the second partial door 250 and according to the opening and closing movement of the first partial door 240, the second partial door 250. It may further include an interlocking unit 300 to move in conjunction.

The interlocking part 300 includes a pair of pulleys 310 and 320 spaced apart along the opening and closing direction of the second partial door 250 and a belt 330 coupled to the pair of pulleys 310 and 320. ), And coupling members 340 and 350 for transmitting the moving force of the belt 330 to the first partial door 240 and the third partial door 260.

The pulleys 310 and 320 are provided in a cylindrical pulley shape and are rotatably coupled along the plate surface direction of the upper wall of the second partial door 250. The pulleys 310 and 320 include a first pulley 310 disposed on one side of the second partial door 250 and a second pulley 320 disposed on the other side. Here, the pair of pulleys 310 and 320 are disposed between the pair of second hanger rollers 220. The pair of pulleys 310 and 320 rotate in conjunction with the belt 330.

The belt 330 is coupled to the outer circumference of the pulley so that the pair of pulleys 310 and 320 rotate in cooperation with each other. In this embodiment, the belt 330 is provided with a wire.

Coupling members 340 and 350 are the first coupling member 340 for coupling the belt 330 and the first partial door 240 disposed in the front region around the rotation axis of each pulley (310, 320), and the rear It includes a second coupling member 350 for coupling the belt 330 and the third partial door 260 disposed in the area. Here, the first coupling member 340 is disposed adjacent to the first pulley 310, the second coupling member 350 is disposed adjacent to the second pulley 320.

Each of the coupling members 340 and 350 is provided as a clip-shaped coupling piece having an approximately 'I' shape to transfer the moving force of the belt 330 to the first partial door 240 and the third partial door 260. .

Meanwhile, in the present exemplary embodiment, the first partial door 240 and the third partial door 260 have the same width, and have a smaller width than the second partial door 250. That is, the distance between the first pulley 310 and the second pulley 320 is greater than or similar to the width of the first partial door 240 and the third partial door 260. Thus, the first partial door 240 and the third partial door 260 can be completely opened. However, each of the partial doors 240, 250, and 260 may be provided with the same width or may be provided with different widths.

The self-closing member 400 includes a casing 410 and the elastic closing portion 420.

The elastic closure portion 420 is accommodated in the casing 410, as shown in Figs. 4A and 4B. The casing 410 is provided in a box shape and mounted on the inner wall surface of the edge of the first partial door 240 of the hanger rails 120, 130, and 140. The first accommodating part 411 for accommodating the elastic closing part 420 is formed inside the casing 410. In this embodiment, the casing 410 is coupled to one side edge of the first hanger rail 120. However, the casing 410 may be attached to or embedded in the side chassis 160.

The elastic closure part 420 is accommodated in the locking ring portion 421 to be engaged with the locking projection 243 provided in the first partial door 240, and is accommodated in the first receiving portion 411 to the locking ring portion 421. Wind-up spring 422 which provides elastic force in the closing direction of the doors 240, 250, and 260, and the wind-up spring 422 are wound and the wind-up support which supports the spring-spring 422 with respect to the 1st accommodating part 411. Wheel 423.

One end of the locking ring 421 is provided in a ring shape, and the other end of the locking ring 421 is wound around the outer circumferential surface of the spring support 423.

The spring 422 is wound around the spring support wheel 423, and the elastic force is overcome or recovered depending on whether the doors 240, 250, and 260 are opened or closed.

The self-supporting wheel 423 is rotatably coupled to the casing 410, and is supported by an elastic force adjusting unit 424 described below so as not to rotate arbitrarily.

The elastic closing part 420 may further include an elastic force adjusting part 424 for adjusting the elastic force of the spring spring 422. The elastic force adjusting unit 424 has a non-circular shape and has a head portion 425 that rotates together with the spring support wheel 423 and a stopper 426 that presses and supports the outer circumferential surface of the head portion 425 to prevent rotation. Include.

The head portion 425 is disposed to be exposed to the outside of the casing 410. The head portion 425 is preferably provided in a regular polygonal shape so as to adjust the elastic force of the spring spring 422 step by step, it is preferable that grooves are formed on each side to improve the bearing capacity of the stopper 426. .

A coupling groove 425a having a predetermined shape is formed in the plate surface of the head portion 425. Thus, the user can rotate the head portion 425 by using a tool such as a screwdriver that is fit-fitted to the coupling groove 425a.

The through hole 125 is formed in the front area of the first hanger rail 120 corresponding to the head 425. Thus, the user can adjust the elastic force of the spring 422 by rotating the head 425 from the outside without separating the device.

One end of the stopper 426 is fixed to the casing 410, and the other end contacts and supports the side or edge area of the head 425. Thus, it is possible to maintain the elastic force of the spring spring 422 adjusted by the user.

The buffer part 430 is elastically deformed by contacting the auxiliary roller 219 of the second hanger roller 220 when the second partial door 250 is closed, and provides resistance to the closed movement of the second partial door 250. do. The buffer unit 430 is mounted on the inner upper wall surface of the second hanger rail 130, and is provided as a leaf spring that is bent with a downward slope along the closing direction of the second partial door 250. The buffer part 430 pressurizes the plate surface of the auxiliary roller 219 to provide resistance to the closing movement of the second partial door 250.

The buffer unit 430 preferably has a smaller elastic force than the elastic force of the spring 422. Thus, the first partial door 240 may be closed by the elastic force of the spring 422, and the first partial door 240 may gradually move while overcoming the elastic force of the shock absorbing part 430.

Meanwhile, in the above-described embodiments, the door part 200 divides the opening 110 of the door chassis 100 into three areas to open and close the first partial door 240, the second partial door 250, and the door part 200. Although described and illustrated as having the third partial door 260, the present invention is not limited thereto and may be provided with one or two partial doors. In this case, the above-described linkage unit 300 is omitted.

In addition, the door part 200 may be provided to divide and open the opening 110 of the door chassis 100 into four or more areas. That is, the first partial door, the second partial door, in which the doors 240, 250, and 260 divide and open the opening 110 of the door chassis 100 into N areas. ... have a N-1 partial door, an Nth partial door, and the interlocking part 300 is provided with N-2 pieces and is mounted to each partial door except the first partial door and the Nth partial door.

Hereinafter, referring to Figures 5a and 5b, the operation of the sliding door assembly 1 according to the present embodiment will be described in detail.

First, the user grips the gripping portion 242 of the first partial door 240 in a closed state with a force of the size that the elastic force of the spring spring 422 is overcome and presses along the opening direction.

Then, the first partial door 240 moves along the opening direction, and the moving force of the first partial door 240 is transmitted to the belt 330 by the first coupling member 340.

Here, the pair of pulleys 310 and 320 rotate by the movement of the belt 330.

On the other hand, when the third partial door 260 is fixed to the door chassis 100 by a locking device (not shown), the movement force of the belt 330 moves the second partial door 250 in the opening direction. . Here, as shown in FIG. 5B, the second partial door 250 is also moved by the moving distance of the first partial door 240. In detail, the first partial door 240 moves relative to the second partial door 250, and the second partial door 250 moves relative to the fixed third partial door 260. will be.

On the other hand, since the buffer part 430 has an upward inclination along the opening direction of the second partial door 250, as the second partial door 250 is opened, the shock absorbing part 430 moves the auxiliary roller 219. The pressing force is gradually reduced. That is, the buffer unit 430 is to press the second partial door 250 in the open direction. Accordingly, the user may open the opening 110 by operating the doors 240, 250, and 260 with little force.

As such, the user may open the second partial door 250 by a simple operation of opening the first partial door 240.

Next, when the user releases the pressure of the first partial door 240 in the open state, the first partial door 240 moves in the closing direction by the elastic force of the spring spring 422.

Here, as in the above-described opening process, the second partial door 250 moves in the closing direction in conjunction with the movement of the first partial door 240 by the operation of the interlocking part 300.

Referring to FIG. 3B, when the first partial door 240 approaches the side chassis 160, the shock absorbing portion 430 pressurizes the auxiliary roller 219 to provide resistance to the closing movement of the second partial door 250. do. Since the shock absorbing portion 430 is inclined downward along the closing direction of the second partial door 250, the shock absorbing portion 430 presses the auxiliary roller 219 according to the closing portion of the second partial door 250. The pressing force is gradually increased.

Here, since the elastic force of the spring 422 is provided larger than the shock absorbing portion 430, the first partial door 240 is gradually closed while the elastic force of the shock absorbing portion 430 is overcome.

On the other hand, when the third partial door 260 is unlocked with respect to the door chassis 100 and the second partial door 250 is fixed with respect to the door chassis 100, the user may select the first partial door 240. When the pressure is released, the third partial door 260 is opened by the interlocking part 300 about the second partial door 250. That is, the opening 110 is opened in a direction in which the first partial door 240 and the third partial door 260 approach each other with respect to the second partial door 250. As such, the user may open the first partial door 240 to the third partial door 260 by a simple operation of opening the first partial door 240.

On the other hand, in the present embodiment has been described and illustrated as pressing the first partial door 240, but in the same principle when the user presses the third partial door 260 in the opposite direction to the linkage unit 300 As a result, the second partial door 250 or the first partial door 240 may be interlocked to open.

On the other hand, when the locking ring 421 is removed from the locking protrusion 243, the first partial door 240 may be kept in a closed state.

Although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. . It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

1 is a perspective view showing a schematic configuration of a sliding door assembly according to a preferred embodiment of the present invention.

2 is a cross-sectional view taken along line AA ′ of FIG. 1.

Figure 3a is a cross-sectional view showing the operating structure of the sliding door assembly according to a preferred embodiment of the present invention.

Figure 3b is a longitudinal sectional view showing the operating structure of the sliding door assembly according to a preferred embodiment of the present invention.

4A is a perspective view of an automatic closing member of a sliding door assembly according to a preferred embodiment of the present invention.

Figure 4b is an exploded perspective view of the automatic closing member of the sliding door assembly according to a preferred embodiment of the present invention.

Figure 5a is a cross-sectional view showing a closed state of the door of the operating state of the sliding door assembly according to a preferred embodiment of the present invention.

Figure 5b is a cross-sectional view showing an open state of the operating state of the sliding door assembly according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1: sliding door assembly 100: door chassis

120: first hanger rail 130: second hanger rail

140: third hanger rail 150: air blocking unit

200: door portion 210: first hanger roller

220: second hanger roller 230: third hanger roller

240: first partial door 250: second partial door

260: third partial door 300: linkage

310: first pulley 320: second pulley

330: belt 340: first coupling member

350: second coupling member 410: casing

420: elastic closure 422: spring

430: buffer

Claims (10)

A sliding door assembly, A door chassis forming an opening and having a hanger rail disposed on an upper portion of the opening, and a side chassis disposed on both sides of the opening; A door part having a hanger roller that slides with respect to the hanger rail, and a plate-shaped door coupled to the hanger roller to open and close the opening in accordance with the slide movement of the hanger roller and having a locking protrusion formed thereon; An elastic closure part coupled to the locking protrusion to elastically press the door in a closing direction; Sliding door assembly comprising a buffer for contacting the hanger roller and the elastic deformation during the closing movement of the door and providing a resistance to the closing movement of the door. The method of claim 1, The elastic closure portion, A catch ring coupled to the catch protrusion; A spring that provides an elastic force to the locking ring in the closing direction of the door; Sliding door assembly comprising a spring support wheel for supporting the spring. The method of claim 2, The elastic closing unit sliding door assembly further comprises an elastic force adjusting unit for adjusting the elastic force of the spring. The method of claim 3, The elastic force adjusting unit, A head portion having a non-circular shape and rotating together with the spring support wheel; And a stopper for pressing and supporting the outer circumferential surface of the head to prevent rotation. The method of claim 1, Sliding door assembly, characterized in that the elastic closing portion has a greater elastic force than the buffer portion. The method of claim 1, The shock absorbing unit is mounted to the inner upper wall surface of the hanger rail, sliding door assembly characterized in that it is provided with a leaf spring bent downward in the closing direction of the door to press the hanger roller. The method according to any one of claims 1 to 6, The door includes at least a first partial door, a second partial door, and a third partial door sequentially arranged in an opening direction to divide and open the opening; A pair of pulleys spaced apart in the opening and closing direction on the upper portion of the second partial door, a belt coupled to the pair of pulleys, and a moving force of the belt is controlled by the first partial door and the third partial door. Sliding door assembly further comprises a linkage having a coupling member for transmitting to. The method of claim 7, wherein And the pair of pulleys are spaced apart from each other by at least one width of at least one of the first partial door and the third partial door. The method of claim 7, wherein The hanger rail further comprises an outside air blocking portion disposed in an upper region between the first partial door and the second partial door and between the second partial door and the third partial door. The method of claim 1, Sliding door assembly, characterized in that the elastic closure portion is provided on the hanger rail.

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