Universal hidden door

The universal hidden door design addresses the risk of hand injuries and flexibility issues in conventional doors by incorporating a rotating frame and hydraulic hinge, ensuring safe use for disabled individuals and reducing waste through modular, adaptable design.

WO2025005596A1PCT designated stage expired Publication Date: 2025-01-02OMNI DOOR CO LTD +1
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Patent Information

Application Number
PCT/KR2024/008650
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-07-19
Filing Date
2024-06-21
Publication Date
2025-01-02

AI Technical Summary

Technical Problem

Conventional doors pose a risk of injury from the gap between the door leaf and frame, especially for disabled individuals, and are inflexible in terms of opening direction, leading to increased manufacturing costs and waste due to complex structures and separate hardware requirements for different materials.

Method used

A universal hidden door design featuring a rotating frame with a rounded area to prevent hand injuries, a hydraulic hinge for easy rotation, and a modular structure allowing easy installation and direction change, compatible with various door materials.

Benefits of technology

The universal hidden door effectively prevents hand injuries and allows for safe use by disabled individuals while simplifying installation and reducing waste by enabling flexible door orientation without the need for complex reinstallation.

✦ Generated by Eureka AI based on patent content.

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Abstract

A universal hidden door is disclosed. The universal hidden door of the present invention comprises: a door frame part having a first vertical frame coupled to one side wall of a wall, a second vertical frame coupled to the other side wall of the wall, and a horizontal frame for connecting the first vertical frame and the second vertical frame; a rotary frame rotatably supported by the first vertical frame so as to prevent the hand of a user from becoming jammed; a door plate of which one side portion is coupled to the rotary frame so as to be rotated together with the rotary frame; a door driving part of which one side portion is coupled to the upper portion of the rotary frame and of which the other side portion is coupled to the upper portion of the door plate so that the door plate is rotated; and a lower support part of which one side portion is coupled to the first vertical frame and of which the other side portion is coupled to the rotary frame so that the rotary frame is rotatably supported.
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Description

Universal Hidden Door

[0001] The present invention relates to a door, and more particularly, to a universal hidden door that prevents a user's hand from being caught and allows a disabled person to use it safely and conveniently.

[0002] Generally, doors have been developed into left-hand sliding doors, right-hand sliding doors, left-hand pulling doors, and right-hand pulling doors depending on how they open, and into synthetic resin doors, wooden doors, steel doors, and glass doors depending on their material and purpose. In other words, doors are classified into sliding doors, swing doors, sliding doors, folding doors, and revolving doors depending on how they open and close.

[0003] Among these, swing doors create a gap between the door and the frame depending on the opening angle. If a finger is caught in this gap when the door closes, serious injuries such as bruises, fractures, or even amputations can occur. This risk is particularly high for children and people with disabilities.

[0004] To solve this problem, various types of door accessories have been disclosed to prevent body parts from being caught in the gap between the door leaf and the door frame.

[0005] However, it has problems such as excessively increasing the volume and manufacturing cost due to its overly complex structure, and requiring complex processes such as inserting mechanical devices into the interior of the door.

[0006] Meanwhile, conventional doors are manufactured with the opening method determined from the time of initial ordering, so if the opening direction changes on-site, they must be re-ordered, re-produced, and re-installed. This results in unnecessary inventory management and waste of warehouse space during the production process, and in the construction process, they must be dismantled and re-constructed, resulting in waste of manpower and costs.

[0007] Also, in the case of doors whose direction can be determined on site, once installed, changing the opening direction requires removing the door frame and door, reinstalling them, and redoing the finishing work, which is wasteful and difficult.

[0008] Furthermore, the hardware is developed separately depending on the material of the door (steel, glass, synthetic resin, wooden door), which limits the market.

[0009] The above-described technical configuration is background technology to help understand the present invention, and does not mean a conventional technology widely known in the technical field to which the present invention belongs.

[0010] Therefore, the technical task of the present invention is to provide a universal hidden door that prevents the user's hand from being caught and can be used safely and conveniently by the disabled.

[0011] According to one aspect of the present invention, a universal hidden door may be provided, including a door frame part having a first vertical frame coupled to one side of a wall, a second vertical frame coupled to the other side of the wall, and a horizontal frame connecting the first vertical frame and the second vertical frame; a rotating frame that is rotatably supported by the first vertical frame to prevent a user's hand from being caught; a door plate having one side coupled to the rotating frame; a door driving part that is coupled to an upper portion of the rotating frame at one side and an upper portion of the door plate at the other side to rotate the door plate; and a lower support part that is coupled to the first vertical frame at one side and an upper portion of the rotating frame at the other side to rotatably support the rotating frame.

[0012] The above rotating frame may include a frame body having a rounded area supported by the first vertical frame to prevent a user's hand from being caught; a connecting frame provided at a lower portion of the frame body; a support shaft coupling portion provided at the connecting frame and to which a lower support shaft of the lower support portion is coupled; a first coupling groove continuously provided from the upper portion to the lower portion of the frame body and to which the door plate is coupled; and a second coupling groove provided at the frame body in the direction of the first vertical frame in the first coupling groove and to which a hinge body of the door driving portion is coupled.

[0013] The above rotating frame includes a frame body having a rounded area supported by the first vertical frame to prevent a user's hand from being caught; a support block provided at a lower portion of the frame body; and a plurality of reinforcing pieces connecting the frame body and the support block, wherein a block hole is provided in the support block, and a lower support shaft of the lower support part can be coupled to the block hole.

[0014] The above door frame portion further includes a first profile portion having a first stopper that is detachably coupled to the second vertical frame and restricts rotation of the door plate, and when the first stopper is positioned in the opposite direction after detaching the first profile portion, rotation of the door plate in the opposite direction can be restricted.

[0015] The door driving unit may include a hydraulic hinge having one side coupled to a second coupling groove of the rotating frame and the other side coupled to the door plate; a hinge fastening bracket coupled to an extension body of the hydraulic hinge and supporting the extension body; and a hinge rotation axis of the hydraulic hinge, the hinge rotation axis guiding the rotation of the hinge rotation axis, one side coupled to the first vertical frame, and the other side coupled to the second vertical frame.

[0016] Embodiments of the present invention prevent users' hands from being pinched, and can also be used safely and conveniently by people with disabilities.

[0017] Additionally, it is easy to install and its location can be easily changed after construction, so the design can be changed according to the furniture arrangement, allowing for a variety of designs.

[0018] FIG. 1 is a schematic drawing of a universal hidden door according to one embodiment of the present invention.

[0019] Fig. 2 is an enlarged perspective view of the upper left area of ​​the door frame portion illustrated in Fig. 1.

[0020] Figure 3 is an exploded perspective view of Figure 2.

[0021] Fig. 4 is a drawing showing the frame connecting bracket and the door connecting bracket shown in Fig. 2 being connected by a fastening member.

[0022] Fig. 5 is another embodiment of the door driving unit illustrated in Fig. 3.

[0023] Figure 6 is an enlarged view of the lower left area of ​​the rotation frame illustrated in Figure 1.

[0024] Figure 7 is a drawing schematically illustrating a rotation frame and its coupling relationship applied to the present embodiment.

[0025] Fig. 8 is a combination diagram of another embodiment of the rotating frame shown in Fig. 6 and the lower support part.

[0026] FIG. 9 is a schematic drawing of a universal hidden door to which another embodiment of the rotating frame illustrated in FIG. 7 is applied.

[0027] Fig. 10 is a schematic drawing showing a second profile portion provided in the second vertical frame illustrated in Fig. 9.

[0028] Figure 11 is a usage state diagram of this embodiment.

[0029] Fig. 12 is a drawing showing the first profile portion illustrated in Fig. 9 being separated from the second vertical frame.

[0030] Fig. 13 is a drawing showing the first profile part separated by the subsequent operation of Fig. 12 being rotated by 90 degrees and coupled to the second vertical frame.

[0031] In order to fully understand the present invention, its operational advantages, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

[0032] Hereinafter, the present invention will be described in detail by describing preferred embodiments thereof with reference to the attached drawings. The same reference numerals in each drawing represent the same components.

[0033] FIG. 1 is a schematic drawing of a universal hidden door according to an embodiment of the present invention, FIG. 2 is a perspective view enlarged of the upper left area of ​​the door frame portion illustrated in FIG. 1, FIG. 3 is an exploded perspective view of FIG. 2, FIG. 4 is a drawing showing the frame connection bracket and the door connection bracket illustrated in FIG. 2 being joined by a fastening member, and FIG. 5 is another embodiment of the door drive unit illustrated in FIG. 3. FIG. 6 is a drawing enlarged of the lower left area of ​​the rotation frame illustrated in FIG. 1, and FIG. 7 is a drawing schematically showing the rotation frame applied to the present embodiment and its joining relationship.

[0034] Also, FIG. 8 is a combination diagram of another embodiment of the rotating frame illustrated in FIG. 6 and the lower support part, FIG. 9 is a schematic diagram of a universal hidden door to which another embodiment of the rotating frame illustrated in FIG. 7 is applied, FIG. 10 is a schematic diagram of a second profile part provided on a second vertical frame illustrated in FIG. 9, FIG. 11 is a diagram of the use state of the present embodiment, FIG. 12 is a diagram illustrating the first profile part illustrated in FIG. 9 being separated from the second vertical frame, and FIG. 13 is a diagram illustrating the first profile part separated by a subsequent operation of FIG. 12 being rotated by 90 degrees and coupled to the second vertical frame.

[0035] As shown in these drawings, a universal hidden door (1) according to the present embodiment comprises a door frame part (100) that is coupled to a wall, a rotation frame (200) that is rotatably coupled to one side of the door frame part (100) to prevent a user's hand from being caught, a door plate (300) that is coupled to one side of the rotation frame (200) to rotate together with the rotation frame (200), a door driving part (400) that is coupled to the upper part of the rotation frame (200) at one side and is coupled to the upper part of the door plate (300) at the other side to rotate the door plate (300), and a lower support part (500) that is coupled to the first vertical frame (110) at one side and is coupled to the rotation frame (200) at the other side to support the rotation frame (200) to rotate.

[0036] The door frame part (100), as shown in FIG. 1, includes a first vertical frame (110), a second vertical frame (120), a horizontal frame (130) whose ends are respectively joined to the first vertical frame (110) and the second vertical frame (120), a first profile part (140) that is detachably joined to the second vertical frame (120) and allows the door plate (300) to rotate 90 degrees, a second profile part (150) that is detachably joined to the second vertical frame (120) and allows the door plate (300) to rotate 180 degrees, a reinforcing joining plate (160) that is joined to the first vertical frame (110) and the second vertical frame (120) and reinforces the first vertical frame (110) and the second vertical frame (120) while joining the first vertical frame (110) and the second vertical frame (120) to the side wall, and a first It includes a frame connecting bracket (170) that connects a vertical frame (110) and a horizontal frame (130) and a second vertical frame (120) and a horizontal frame (130) to each other.

[0037] As shown in Fig. 3, a first frame hole (111) is provided in the first vertical frame (110) of the door frame section (100), and one side of a frame connection bracket (170) can be detachably connected to this using a screw or bolt.

[0038] In this embodiment, the first frame hole (111) can be provided across the entire height of the first vertical frame (110), and a reinforcing joint plate (160) can be detachably joined using bolts or screws in an area other than the area where the frame connecting bracket (170) is joined.

[0039] In addition, in the present embodiment, the first vertical frame (110) is provided with a first curved portion (112) and a second curved portion (113), as shown in FIG. 7, so that the curved area of ​​the rotating frame (200) can be brought into close contact, thereby preventing the user's hand from being caught.

[0040] Furthermore, in the present embodiment, a profile portion (not shown) may be provided in the first vertical frame (110) to fill a micro gap between the rotating frame (200) and the first vertical frame (110).

[0041] As shown in Fig. 9, a second frame hole (121) is provided in the second vertical frame (120) of the door frame section (100), and one side of a frame connection bracket (170) can be detachably connected to this using a screw or bolt.

[0042] In this embodiment, the second frame hole (121) can be provided across the entire height of the second vertical frame (120), and a reinforcing joint plate (160) can be detachably joined using bolts or screws in an area other than the area where the frame connecting bracket (170) is joined.

[0043] The first profile portion (140) of the door frame portion (100) is provided on the second vertical frame (120), as shown in FIG. 9, so that the door plate (300) can be rotated only 90 degrees in one direction, for example, in the downward direction based on FIG. 9.

[0044] In the present embodiment, the first profile portion (140), as illustrated in FIG. 9, includes a first body (141) that is inserted and coupled to the inner wall of the second vertical frame (120), a first coupling protrusion (142) that is provided at the inner central portion of the first body (141) and is detachably fitted into a hole provided in the second vertical frame (120), a pair of second coupling protrusions (143) that are provided at an inclined region of the first body (141) and are detachably fitted into a groove provided in the second vertical frame (120), and a first stopper (144) that is provided to protrude outward from the first body (141) and controls the door plate (300) to rotate in one direction, for example, in a downward direction based on FIG. 9.

[0045] In this embodiment, the first coupling protrusion (142) may be provided with a larger volume than a pair of second coupling protrusions (143) to improve the fixing force.

[0046] In this embodiment, the first profile portion (140) can be separated from the second vertical frame (120) by separating the first coupling protrusion (142) and a pair of second coupling protrusions (143) from the second vertical frame (120), and then the second profile portion (150) can be coupled to the second vertical frame (120). As a result, the door plate (300) can be rotated 180 degrees by the second profile portion (150).

[0047] In this embodiment, after the first profile portion (140) is separated from the second vertical frame (120) by separating the first coupling protrusion (142) and a pair of second coupling protrusions (143) from the second vertical frame (120), as shown in FIGS. 12 and 13, the opening direction of the door plate (300) can be changed after the first stopper (144) is positioned in the opposite direction. That is, in FIG. 12 (a), the first stopper (144) is positioned on the right side, so the door plate (300) cannot be opened to the right, but in FIG. 13 (c), the first stopper (144) is positioned on the left side, so the door plate (300) can be opened to the right.

[0048] The second profile portion (150) of the door frame portion (100) is provided on the second vertical frame (120), as shown in FIG. 10, so that the door plate (300) can be rotated in one direction, for example, 180 degrees based on FIG. 10.

[0049] In the present embodiment, the second profile portion (150) includes, as illustrated in FIG. 10, a second body (151) that is inserted and coupled to the inner wall of the second vertical frame (120), a third coupling protrusion (152) that is provided in the inner central portion of the second body (151) and is detachably fitted and coupled to a hole provided in the second vertical frame (120), and a pair of fourth coupling protrusions (153) that are provided in an inclined region of the second body (151) and are detachably fitted and coupled to a groove provided in the second vertical frame (120).

[0050] In this embodiment, the third coupling protrusion (152) may be provided with a larger volume than a pair of fourth coupling protrusions (153) to improve the fixing force.

[0051] The reinforcing joint plate (160) of the door frame (100) can be inserted into the first frame hole (111) and the second frame hole (121) and then detachably connect the first vertical frame (110) and the second vertical frame (120) to the side wall using bolts or screws.

[0052] In this embodiment, a plurality of connecting holes through which screws or bolts pass may be spaced apart from each other in the reinforcing connecting plate (160).

[0053] The frame connecting bracket (170) can detachably connect the first vertical frame (110) and the horizontal frame (130) and the second vertical frame (120) and the horizontal frame (130) using bolts or screws.

[0054] The rotating frame (200) is supported to be rotated on the first vertical frame (110), as shown in FIG. 2, to prevent the user's hand from being caught, and is driven by the door driving unit (400) to be rotated at a certain angle, for example, 90 degrees or 180 degrees.

[0055] In this embodiment, the rotating frame (200) includes a frame body (210) having a rounded area supported by the first vertical frame (110) as shown in FIG. 7 to prevent the user's hand from being caught, a connecting frame (220) provided at the lower portion of the frame body (210), and a support shaft coupling portion (230) provided at the connecting frame (220) and to which a lower support shaft (520) of a lower support portion (500) is rotatably coupled.

[0056] The frame body (210) of the rotating frame (200) includes a first coupling groove (211) that is continuously provided from the upper end to the lower end of the frame body (210) and to which a door plate (300) is coupled, and a second coupling groove (212) that is provided in the frame body (210) in the direction of the first vertical frame (110) from the first coupling groove (211) and to which a hinge body (411) of a door driving unit (400) is coupled, and the first coupling groove (211) and the second coupling groove (212) are illustrated in (a) of FIG. 7.

[0057] The connecting frame (220) of the rotating frame (200) is provided at the lower part of the rotating frame (200) and can be provided as an installation location for the support shaft coupling part (230).

[0058] In the present embodiment, the connecting frame (220) is provided with a first space portion and a second space portion, as illustrated in (b) of Fig. 7. In the present embodiment, the first space portion is provided smaller than the second space portion, and a support shaft coupling portion (230) may be provided in the first space portion.

[0059] The support shaft coupling portion (230) of the rotating frame (200) is provided in the first space portion of the connecting frame (220), as shown in (b) of FIG. 7, and the lower support shaft (520) of the lower support portion (500) is coupled thereto to support the support shaft coupling portion (230) to rotate.

[0060] In this embodiment, the support shaft coupling portion (230) may be provided in a circular shape.

[0061] Meanwhile, in the present embodiment, the rotating frame (200) may have a different configuration except for the frame body (210) described above, as shown in FIGS. 9 and 10.

[0062] In this embodiment, the rotating frame (200) includes a frame body (210) having a rounded area supported by the first vertical frame (110) as illustrated in FIG. 9 to prevent the user's hand from being caught, a support block (240) provided at the lower portion of the frame body (210), and a plurality of reinforcing pieces (250) connecting the frame body (210) and the support block (240).

[0063] In this embodiment, a block hole (241) is provided in the support block (240), and a lower support shaft (520) of a lower support part (500) is coupled to the block hole (241) so that the rotation frame (200) can rotate.

[0064] The door plate (300) is coupled to the first coupling groove (211) of the rotating frame (200), as shown in FIG. 7, so that the rotating frame (200) can rotate together.

[0065] In the present embodiment, the door plate (300) may be made of a material including at least one of a plastic material including ABS (acrylonitrile-buradiene-styrene), a wood material, a metal material, and a honeycomb.

[0066] In this embodiment, a handle (310) may be provided on the door plate (300).

[0067] As shown in FIG. 2, the door driving unit (400) has one side coupled to the upper part of the rotating frame (200) and the other side coupled to the upper part of the door plate (300) to rotate the door plate (300).

[0068] In the present embodiment, the door driving unit (400) includes, as illustrated in FIG. 3, a hydraulic hinge (410) having one side coupled to a second coupling groove (212) of a rotation frame (200) and the other side coupled to a door plate (300), a hinge fastening bracket (420) coupled to an extension body (412) of the hydraulic hinge (410) to support the extension body (412), and a door coupling bracket (430) coupled to a hinge rotation axis (413) of the hydraulic hinge (410) to guide rotation of the hinge rotation axis (413), and having one side coupled to a first vertical frame (110) and the other side coupled to a second vertical frame (120).

[0069] The hydraulic hinge (410) of the door drive unit (400) includes, as shown in (a) of FIG. 7, a hinge body (411) having one side coupled to the second coupling groove (212) and the other side coupled to the door plate (300), an extension body (412) provided on the upper part of the hinge body (411) and rotated, and having a hinge fastening bracket (420) coupled on the upper part thereof, as shown in FIG. 3, and a hinge rotation shaft (413) provided on the upper part of the extension body (412) and rotated together with the extension body (412) and supporting the hinge fastening bracket (420).

[0070] In this embodiment, when the door drive unit (400) is operated, the rotation frame (200), hinge body (411), and door plate (300) are rotated, and the door plate (300) can be selectively rotated by 90 degrees or 180 degrees.

[0071] The door coupling bracket (430) of the door drive unit (400) can be detachably coupled to the frame connection bracket (170) using a fastening member (B), for example, a bolt, as illustrated in FIG. 4.

[0072] Meanwhile, in the present embodiment, the door driving unit (400a) includes, as shown in FIG. 5, a shaft member (440) coupled to the frame body, and a fastening frame (450) that is detachably coupled to the frame connecting bracket (200) using a fastening member (B) on both sides, for example, a bolt, coupled to the central portion of the shaft member.

[0073] The lower support member (500) can be coupled to the first vertical frame (110) to rotatably support the lower portion of the rotation frame (200), as illustrated in FIG. 6.

[0074] In this embodiment, the lower support member (500) includes, as illustrated in FIG. 6, an axis support plate (510) having one side joined to the vertical frame, and a lower support shaft (520) provided on the axis support plate (510) to rotatably support the lower portion of the rotation frame (200).

[0075] In this embodiment, the shaft support plate (510) includes a first plate (511) coupled to the first vertical frame (110), as shown in FIG. 6, and a second plate (512) coupled vertically to the first plate (511) and having a lower support shaft (520) provided on the upper surface.

[0076] In this embodiment, the first plate (511) can be connected to the reinforcing piece (250) using a bolt or screw, and at this time, one end of the bolt or screw can penetrate the reinforcing plate and be connected to the side wall.

[0077] As such, the present invention is not limited to the described embodiments, and it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should fall within the scope of the claims of the present invention.

[0078] Description of the symbol

[0079] 1: Universal hidden door

[0080] 100: Door frame part 110: First vertical frame

[0081] 111: First frame hole 112: First bend

[0082] 113: Second bend 120: Second vertical frame

[0083] 121: Second frame hole 130: Horizontal frame

[0084] 140: First profile section 141: First body

[0085] 142: First connecting protrusion 143: Second connecting protrusion

[0086] 144: First stopper 150: Second profile section

[0087] 151: Second body 152: Third connecting protrusion

[0088] 153: 4th connecting projection 160: Reinforcing connecting plate

[0089] 170: Frame connecting bracket 200: Rotating frame

[0090] 210: Frame body 211: First joining groove

[0091] 212: Second connecting groove 220: Connecting frame

[0092] 221: First space section 222: Second space section

[0093] 230: Support shaft joint 240: Support block

[0094] 241: Block hole 250: Reinforcement section

[0095] 300: Door plate 400: Door actuator

[0096] 410: Hydraulic hinge 411: Hinge body

[0097] 412: Extension body 413: Hinge rotation axis

[0098] 420: Hinge fastening bracket 430: Door joining bracket

[0099] 440: Axle member 450: Fastening frame

[0100] 500: Lower support 510: Axis support plate

[0101] 511: First plate 512: Second plate

[0102] 520: Lower support shaft B: Fastening member

[0103] This embodiment prevents the user's hand from being pinched, and also allows the disabled to use it safely and conveniently.

Claims

1. A door frame part having a first vertical frame coupled to one side of a wall, a second vertical frame coupled to the other side of the wall, and a horizontal frame connecting the first vertical frame and the second vertical frame; A rotating frame that is supported rotatably on the first vertical frame to prevent the user's hand from being caught; A door plate having one side joined to the above rotating frame and rotating together with the above rotating frame; A door driving unit having one side coupled to the upper part of the rotating frame and the other side coupled to the upper part of the door plate to rotate the door plate; and A universal hidden door comprising a lower support portion, one side of which is coupled to the first vertical frame and the other side of which is coupled to the rotation frame to support the rotation frame in a rotational manner.

2. In claim 1, The above rotating frame, A frame body having a rounded area supported by the first vertical frame to prevent the user's hand from being caught; A connecting frame provided at the lower part of the above frame body; A support shaft coupling part provided on the above connecting frame and to which the lower support shaft of the lower support part is coupled; A first joining groove continuously provided from the upper part to the lower part of the frame body and to which the door plate is joined; and A universal hidden door including a second joining groove provided in the frame body in the direction of the first vertical frame in the first joining groove and to which the hinge body of the door driving unit is joined.

3. In claim 1, The above rotating frame, A frame body having a rounded area supported by the first vertical frame to prevent the user's hand from being caught; A support block provided at the lower part of the above frame body; and It includes a plurality of reinforcing pieces connecting the frame body and the support block, A block hole is provided in the above support block, A universal hidden door in which the lower support shaft of the lower support part is connected to the above block hole.

4. In claim 1, The above door frame part, Further comprising a first profile part having a first stopper that is detachably coupled to the second vertical frame and limits rotation of the door plate, A universal hidden door that restricts the opposite rotation of the door plate when the first stopper is positioned in the opposite direction after separating the first profile portion.

5. In claim 1, The above door driving unit, A hydraulic hinge having one side coupled to the second coupling groove of the rotating frame and the other side coupled to the door plate; A hinge fastening bracket coupled to the expansion body of the hydraulic hinge and supporting the expansion body; and A universal hidden door comprising a door coupling bracket that is coupled to the hinge rotation axis of the hydraulic hinge and guides the rotation of the hinge rotation axis, one side of which is coupled to the first vertical frame and the other side of which is coupled to the second vertical frame.

Citation Information

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