KR20140121999A

KR20140121999A - Wall bed with desk

Info

Publication number: KR20140121999A
Application number: KR20130038443A
Authority: KR
Inventors: 김국희; 김중삼
Original assignee: (주)대영이엔텍; 김국희
Priority date: 2013-04-09
Filing date: 2013-04-09
Publication date: 2014-10-17

Abstract

The present invention relates to a wall bed with a desk, wherein the accessorial desk can be automatically folded or unfolded when the wall bed is unfolded or folded, thereby easily folding or unfolding the accessorial desk without the extra manual operation of the accessorial desk. According to the present invention for the above effect, a wall bed with a desk comprises: a wall bed main body installed to be fixed to an indoor wall; a bed housed in the wall bed main body when folded with respect to a rotary central shaft, or unfolded with respect to the rotary central shaft from the wall bed main body onto an indoor floor; a desk board installed on the bottom surface of the bed, able to rotate, and used to be horizontally unfolded when the bed is folded to be housed in the wall bed main body; and an automatic folding and unfolding unit folding the desk board to the bed automatically when the bed is unfolded onto the floor, and unfolding the desk board from the bed automatically when the bed is folded to the wall bed main body.

Description

WALL BED WITH DESK

[0001] The present invention relates to a desk-type wall bed, and more particularly, to a desk which can be folded and folded automatically when folded or unfolded, so that the desk can be easily folded or unfolded This relates to a combination wall bed.

In recent years, small houses of small size have been supplied in various forms. These small houses have very narrow indoor space, so furniture such as beds, desks, and cabinets should be designed with high space utilization.

As an example of furniture with high space utilization, there is a wall bed. The wall bed can be folded on the wall or spread out on the floor as needed. When used as a bed, it is spread from the wall to the floor. When the bed is not necessary, it is folded on the wall and stored.

In some cases, the wall bed may be configured to be utilized as a desk when it is folded and housed on a wall surface. In this case, a folding table is installed on the underside of the wall bed.

Such a wall bed can be used only when a bed is necessary, so space utilization is very high. Therefore, it is possible to efficiently use a narrow indoor space. As a result, it is very suitable for small houses of small size.

However, such a conventional wall bed has a disadvantage that it is difficult to fold or unfold. In particular, when a folding desk is laid on the underside, the folding desk must be folded or unfolded every time the wall is folded or unfolded, and such drawbacks make it very inconvenient to use. And because of these problems, many users are reluctant to use folding desks.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a simple wall-bed combination which is very easy to fold or unfold.

Another object of the present invention is to provide a desk-like wall bed which can be easily folded or unfolded without manually operating the desk on the bottom by automatically folding the desk attached to the bottom when folded or unfolded have.

It is another object of the present invention to provide a desk-top wall bed which can be easily folded or unfolded without manual operation of the bottom desk, thereby maximally improving convenience for the user.

In order to achieve the above object, the present invention provides a wall-wand for a desk-top, comprising: a wall-bed main body fixedly installed on a wall surface of a room; And the bed is folded on the wall bed main body and rotatably installed on the bottom surface of the bed so as to be used in a horizontal state when the bed is folded and stored in the wall bed main body, And a desk; And automatic folding means for automatically folding the desk to the bed when the bed is spread to the floor and automatically folding the desk to the bed when folding the bed to the wall bed main body .

Preferably, the automatic folding means keeps the posture of the desk to be always horizontal regardless of folding or unfolding of the bed, and when the bed is folded vertically to the wall bed body, And a horizontal holding device for spreading the bed horizontally with respect to the bed and horizontally folding the bed when the bed is spread horizontally on the floor surface.

The desk has a rotation center axis parallel to the rotation center axis of the bed so as to be rotatable with respect to the bed while having a rotation axis parallel to the bed.

The horizontal holding device may include a first lever rotatably installed on the wall bed main body part spaced apart from the rotation center axis of the bed and corresponding to and corresponding to the bed part; A second lever rotatably connected at one end to the first lever and rotatably connected at the other end to the bed, and mating with and corresponding to the wall bed body; A third lever integrally fixed to a rotation center shaft of the second lever so as to rotate integrally with the second lever; A fourth lever rotatably connected to a distal end of the third lever and mating with and corresponding to the bed portion; And a fifth lever which is rotatably connected to the fourth lever at one end and is integrally fixed to the rotation center shaft of the desk plate at the other end and is mated with and corresponding to the third lever; Wherein the first and second levers form a four-section parallel crank mechanism together with the corresponding wall-bed body and the corresponding bed, So as to maintain a constant posture and transmit to the third lever while being parallel to the corresponding wall bed body; Wherein the fourth and fifth levers form a four-section parallel crank mechanism together with the corresponding third lever and bed, wherein the fifth lever is configured to pivot The second lever is kept in a constant posture while being parallel to the third lever so that the desk plate in a horizontal state integrally connected to the third lever is kept in a horizontal state at all times regardless of the rotation of the bed.

And an actuator having one end rotatably supported on the wall bed main body and the other end rotatably supported on the bed; The actuator automatically folds or unfolds the bed while stretching and contracting according to an applied driving source.

According to the desk-top wall bed according to the present invention, since the posture of the desk can be always kept horizontal by using two "parallel crank mechanisms " when folding the bed, , It has the effect that the desk board can be automatically folded or unfolded on the bed.

In addition, since the desk can be automatically folded or unfolded when the bed is opened or folded, there is an effect that it is possible to alleviate the inconvenience of manually folding or unfolding the desk board each time the bed is opened or folded.

In addition, since the deskboard can be manually folded or unfolded every time when the bed is unfolded or folded, the convenience of the user can be maximized.

Further, since the bed can be automatically opened or collapsed through the actuator, the convenience of the user can be maximized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of a desk-like wall bed according to the present invention, which is a perspective view showing a case where a bed is unfolded,
FIG. 2 is a perspective view enlarging and showing a main portion of a wall-table combined with a desk according to the present invention,
FIG. 3 is a view showing a configuration of a desk-like wall bed according to the present invention, which is a perspective view showing a case where a bed is folded,
4 is a side cross-sectional view showing a configuration of a wall-bed for a desk and a common use of the present invention,
FIG. 5 is a side sectional view enlargedly showing a main part of a wall-table combination and a desk according to the present invention,
6 to 8 are operational views showing an operation example of a desk-like wall bed according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a desk-like wall bed according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, a desk-top wall-bed according to the present invention includes a wall-bed main body 10 and a bed 20 which is foldably installed on the wall-wall main body 10.

The wall bed main body 10 is fixedly provided on a wall surface of a room and has a storage groove 12 into which the bed 20 can be housed.

The accommodating grooves 12 are elongated in the transverse direction and the accommodating grooves 12 thus formed are configured such that the beds 20 are laterally folded and housed or laterally unfolded.

On the other hand, a plurality of bookcase grooves 14 are formed in the upper portion of the receiving groove 12, and the bookcase grooves 14 are configured to accommodate books and various articles.

The bed 20 includes a frame 22 and a mattress 24 provided on the upper surface of the frame 22. [

The frame 22 includes a main frame 22a made of a steel material and a cover frame 22b provided with a lower surface and a side surface portion of the main frame 22a. Particularly, the main frame 22a is composed of an outer rectangular frame portion 22c and a plurality of reinforcing bars 22d reinforcing the inner space of the rectangular frame 22c.

The bed 20 having such a constitution is rotatably mounted on the wall bed main body 10 around the rotation center shaft 20a and the frame 22 thus installed is folded on the wall bed main body 10, And is configured to expand from the bed body 10 to the floor surface B. [

Particularly, it is configured to be folded on the wall-bed body 10 or spread on the floor surface B, so that it can be used as a bed or folded on a wall surface to be housed.

Here, the bed 20 is rotatably installed on a supporting bar 26 passing through the frame 22 of the bed 20 and having both ends fixed to the wall bed main body 10. [ Particularly, a plurality of support brackets 28 fixed to the support bar 26 are rotatably installed on the support bracket 28. The thus installed bed 20 is supported by the support brackets 28 around the rotation center shaft 20a It is installed to be foldable.

1 to 4, the desk-top wall-bed of the present invention includes at least one damper 30 provided between the wall-bed main body 10 and the bed 20.

The damper 30 is a gas shock absorber having one end rotatably supported on the support bar 26 of the wall bed main body 10 and the other end rotatably supported on the frame 22 of the bed 20.

The damper 30 minimizes the rotational impact generated when the bed 20 is folded, while stretching and contracting when the bed 20 is folded. Particularly, the rotation shock generated when the bed 20 is spread in the wall bed main body 10 is minimized. Accordingly, it is possible to alleviate the risk of product damage, breakdown, and safety accident occurring when the bed 20 is opened.

On the other hand, an actuator 32 may be provided between the wall-bed main body 10 and the bed 20.

An actuator 32 is constituted by an electric motor type cylindrical actuator and has one end rotatably supported on a support bar 26 of a wall bed main body 10 and the other end rotatably supported on a frame 22 As shown in Fig.

The actuator 32 expands and contracts in accordance with an applied electric signal. The actuator 32, which thus elongates and contracts, automatically rotates the bed 20. In particular, the bed 20 is automatically unfolded from the wall bed body 10 or automatically folded from the floor surface to the wall bed body 10.

Therefore, the bed 20 is automatically folded without the user's manipulation. As a result, the convenience of the user is maximized.

3 and 5, the desk-type wall-bed according to the present invention further includes a desk device 40 installed on a bottom surface 20b of the bed 20.

The desk apparatus 40 is provided with a desk plate 42 rotatably installed on the bottom surface 20b of the bed 20.

The desk plate 42 is provided along the longitudinal direction of the bed 20 and has a rotation center axis 42a parallel to the rotation center axis 20a of the bed 20.

The desk plate 42 having the rotation center axis 42a parallel to the rotation center axis 20a of the bed 20 rotates with respect to the bed 20 while having a rotation axis parallel to the bed 20 .

On the other hand, the desk apparatus 40 includes an automatic folding means for automatically folding or unfolding the desk plate 42 when the bed 20 is folded or unfolded.

The automatic folding means is configured such that when the bed 20 is folded vertically to the wall bed main body 10, the desk board 42 is horizontally extended from the bottom face 20b of the bed 20, When spreading horizontally on the surface B, the desk plate 42 is horizontally folded on the bottom surface 20b of the bed 20. [

Such an automatic folding means includes a horizontal holding device 50 capable of keeping the posture of the desk plate 42 always horizontal regardless of the rotation of the bed 20. [

4 to 8, the horizontal holding device 50 includes a first lever 52 rotatably installed on the wall-bed main body 10, a second lever 52 connected to the first lever 52, A third lever 55 integrally fixed to the rotation center shaft 54a of the second lever 54 and a third lever 55 connected to the third lever 55, And a fifth lever 58 that connects the fourth lever 56 to the rotation center shaft 42a of the desk plate 42. [

The first lever 52 is rotatably installed on the support bracket 28 of the wall bed main body 10. In particular, the support bracket 28 is rotatably mounted on the rotation center shaft 52a, and the distal end thereof is rotatably connected to the second lever 54. [

The rotation center axis 52a of the first lever 52 is spaced apart from the rotation center axis 20a of the bed 20 by a distance. In particular, it is spaced apart from the rotation center shaft 20a of the bed 20 toward the front portion.

The first lever 52 structured in this way corresponds to and corresponds to the portion of the bed 20. Particularly, it corresponds to and corresponds to the portion of the bed 20 between the rotational center axis 20a of the bed 20 and the rotational center axis 54a of the second lever 54. [

The first lever 52 mating with and corresponding to the portion of the bed 20 includes a support bracket 28 portion between the rotation center shaft 52a and the rotation center shaft 20a of the bed 20, Quot; link "together with the second lever 54 and the part of the bed 20 between the rotation center shaft 20a of the first lever 54 and the rotation center shaft 54a of the second lever 54 .

Particularly, since the portion of the support bracket 28 is fixed to the wall-bed main body 10, the first lever 52 is fixed to the portion of the bed 20, Together with the second lever 54, constitute a "movable section ".

Since the first lever 52 has a structure in which the supporting bracket 28 is a fixed section and a movable section is formed with the bed 20 and the second lever 54, 20 move together with the bed 20 and the second lever 54 at a specific rotational locus and a rotational angular velocity when the bed 20 rotates with respect to the wall bed main body 10. [

The second lever 54 is rotatably mounted on the frame 22 of the bed 20. In particular, the second lever 54 installed to be rotatable around the rotation center shaft 54a extends toward the unfolding direction of the bed 20, and the distal end of the second lever 54 is connected to the distal end of the first lever 52 Respectively.

The second lever 54 configured in this manner corresponds to the supporting bracket 28 and is mated with the latter. Particularly, the support bracket 28 is mated with the rotation center axis 20a of the bed 20 and the rotation center axis 52a of the first lever 52 to correspond to each other.

The second lever 54 mated with the support bracket 28 and corresponding to the support bracket 28 is connected to the first lever 52, the support bracket 28, And the second lever 54 formed in this way is configured such that when the bed 20 is folded against the wall bed body 10, the portion of the support bracket 28 is " 1 lever 52 and the bed 20 portion.

On the other hand, the second lever 54 is supported by the supporting bracket 28 between the rotation center shaft 52a of the first lever 52 and the rotation center shaft 20a of the bed 20, And the length l of the support bracket 28 between the rotation center axis 52a of the first lever 52 and the rotation center axis 20a of the bed 20 is equal to the length L .

The first lever 52 maintains a state parallel to the portion of the bed 20 between the rotation center axis 20a of the bed 20 and the rotation center axis 54a of the second lever 54, The length m is equal to the length M of the portion of the bed 20 between the rotational center axis 20a of the bed 20 and the rotational center axis 54a of the second lever 54. [

The reason for this construction is that the first lever 52 and the second lever 54 constituting the "four-link", the two portions of the bed 20 and the support bracket 28, The first lever 52 and the second lever 54 constituting the "four-bar link" and the portion of the bed 20 and the support bracket 28 constitute a "parallelogram" &Quot; Parallel Crank Mechanism "

The reason for this construction is that when the bed 20 is folded, the portion of the first lever 52 and the bed 20 facing each other and the portion of the support bracket 28, 2 lever 54 can always move parallel to each other.

In particular, the second lever 54, which is a "movable section", is designed to allow parallel motion while maintaining a constant posture with respect to the opposing "fixed section" support bracket 28 portion.

Therefore, the second lever 54 can move together with the bed 20 while maintaining a constant posture regardless of the rotational position of the bed 20. [0064]

The third lever 55 is integrally fixed to a portion of the rotation center shaft 54a of the second lever 54 and the third lever 55 fixed in this manner moves integrally with the second lever 54 .

Particularly, when the second lever 54 maintains a constant posture regardless of the rotation of the bed 20, the third lever 55 is moved together with the second lever 54 regardless of the rotation of the bed 20 Always maintain a constant posture.

The fourth lever (56) is rotatably connected to the distal end of the third lever (55). One end of the fifth lever 58 is rotatably connected to the fourth lever 56 and the other end of the fifth lever 58 is integrally fixed to the rotational center shaft 42a of the desk plate 42. [

Here, the fourth lever 56 is paired and corresponding to the portion of the bed 20. Particularly, it corresponds to and corresponds to the portion of the bed 20 between the rotational center axis 54a of the third lever 55 and the rotational center axis 42a of the desk plate 42. [ And the fifth lever 58 is paired with the third lever 55 and corresponding thereto.

The fourth and fifth levers 56 and 58 paired with the bed 20 portion and the third lever portion 55 together with the third lever 55 and the portion of the bed 20 form a four- Link "

Particularly, since the third lever 55 maintains a constant attitude regardless of the rotation of the bed 20, the fourth lever 56 and the fifth lever 58 and the bed The link portion 20 forms the " movable section "with reference to the third lever 55 which is the" fixed section "

The third lever 55 and the fifth lever 58 and the fourth lever 56 and the portion of the bed 20 which are opposed to each other are configured to have the same lengths X and Y .

The reason for this construction is that the third lever 55, the fourth lever 56, the fifth lever 58 and the part of the bed 20 constituting the "four-bar link" are "parallel crank mechanism" As shown in FIG.

The reason for this construction is that, when the bed 20 is folded, the third lever 55 and the fifth lever 58 and the fourth lever 56, which are opposed to each other, So that the portions of the bed 20 can always move parallel to each other.

Particularly, the fifth lever 58, which is a "movable section", is allowed to perform parallel motion while maintaining a constant posture with respect to the third lever 55 of the mating "fixed section".

As a result, as shown in Figs. 4 to 8, the fifth lever 58 is always in a constant posture with the third lever 55, which always maintains a constant posture regardless of the rotational position of the bed 20 . Thus, the integrally connected desk plate 42 can maintain a horizontal posture regardless of the rotational position of the bed 20.

When the bed 20 is folded vertically to the wall bed body 10, the desk plate 42 is horizontally unfolded from the bottom surface 20b of the bed 20, The desk plate 42 is horizontally folded on the bottom surface 20b of the bed 20 when it is spread horizontally on the surface B as shown in Fig. Thereby, when the bed 20 is folded or unfolded, the desk plate 42 is automatically unfolded or folded.

2 to 8, the desk apparatus 40 of the present invention is a desk apparatus 40 that supports the deskboard 42 in a horizontal state when the bed 20 is folded on the wall bed main body 10, (60).

The support means 60 includes a pair of support rods 62 rotatably mounted on both sides of the distal end portion 42b of the desk plate 42 and a distal end portion 62a of the support rods 62, A moving means 64 for movably supporting the bed 20 to the wall bed main body 10 and a moving means 64 for moving the end portion 62a of the supporting rods 62 provided on the desk board 42 when the bed 20 is folded into the wall bed main body 10 And a stopper 66 for restricting movement.

The moving means 64 includes a guide rail 64a provided on the bed 20 and a slider 64 slidably mounted along the guide rail 64a in a state of supporting the distal end portion 62a of the support rod 62. [ (64b).

This moving means 64 is configured to move the distal end portion 62a of the support rod 62 along the portion of the bottom surface 20b of the bed 20 when the bed 20 is rotated with respect to the wall bed body 10 Allow to move. Therefore, when the bed 20 is folded, the desk plate 42 can be rotated with respect to the bed 20 to maintain a horizontal state.

The stopper 66 is provided on the guide rail 64a. Particularly, as shown in Figs. 4 and 5, when the bed 20 is folded on the wall bed body 10, it is fixed correspondingly to the lower side of the distal end portion 62a of the support rod 62. [

The stopper 66 restricts the distal end portion 62a of the support rod 62 from moving in the downward direction when the bed 20 is folded on the wall bed main body 10. [ Therefore, it serves to support the distal end portion 62a of the support rod 62.

As a result, the support rod 62 supports and supports the desk plate 42 on which the support rod 62 is installed. As a result, when the load is applied to the desk board 42, the desk board 42 is prevented from falling down in the downward direction.

Next, an operation example of the present invention having such a configuration will be described with reference to Figs. 4 to 8. Fig.

First, a case will be described in which a bed 20 folded on a wall bed body 10 is opened to use a bed.

4, when the bed 20 is folded in the wall-bed body 10, the desk plate 42 provided on the bottom surface 20b of the bed 20 is bent at right angles to the bed 20 It is unfolded and horizontal.

In this state, when the bed 20 is unfolded from the wall-bed main body 10 in order to use the bed, the bed 20 is rotated by the rotation center shaft 20a (see Fig. 6) (B) as shown in Fig.

At this time, the second lever 54 provided on the bed 20 is rotated with respect to the portion of the support bracket 28 which is fixed with the bed 20, Parallel crank mechanism "together with the portion of the support bracket 28 which is the" stationary section " maintains a constant posture regardless of the rotational position of the bed 20 while maintaining a state parallel to the support bracket 28 .

This state of the second lever 54 in such a constant state is that the third lever 55, the fourth lever 56, the fifth lever 58 and the part of the bed 20 constituting the "parallel crank mechanism" To the desk board (42).

As a result, the desk plate 42 is always kept horizontal regardless of the spread of the bed 20. Particularly, as shown in Fig. 8, even if the bed 20 is fully opened, the desk plate 42 is folded side by side on the bed 20 while maintaining a horizontal state with respect to the bed 20.

Thereby, when spreading the bed 20, the desk board 42 need not be manually folded. As a result, the convenience of the user is remarkably improved.

Next, a case where the unused bed is folded and stored in the wall bed main body 10 will be described.

First, as shown in Fig. 8, the bed 20 spreading on the bottom surface B is folded into the receiving groove 12 of the wall bed main body 10.

Then, the bed 20 is folded into the receiving groove 12 of the wall-bed body 10 while being rotated about the rotation center shaft 20a, as shown in Figs. 7, 6 and 4.

At this time, the second lever 54 provided on the bed 20 is rotated with respect to the portion of the support bracket 28 which is fixed with the bed 20, Maintaining a constant posture regardless of the rotational position of the bed 20 while maintaining a state parallel to the portion of the support bracket 28 which is the "fixed section ".

This state of the second lever 54 in a constant state is transmitted to the desk plate 42 through the third lever 55, the fourth lever 56, the fifth lever 58 and the part of the bed 20 do.

As a result, the desk plate 42 is always kept horizontal regardless of the folding of the bed 20. Particularly, as shown in FIGS. 4 and 5, even when the bed 20 is completely folded, the desk plate 42 is kept in a horizontal state with respect to the bed 20, .

Thereby, when the bed 20 is folded, the desk plate 42 need not be manually expanded. As a result, the convenience of the user is remarkably improved.

According to the present invention having such a structure, since the posture of the desk plate 42 can be always kept horizontal by using two "parallel crank mechanisms " at the time of folding the bed 20, So that the desk board 42 can be automatically folded or unfolded on the bed.

In addition, since the structure in which the desk board 42 is automatically folded or unfolded when the bed 20 is extended or folded, the desk board 42 must be manually folded or unfolded each time the bed 20 is unfolded or folded It can alleviate the hassle.

In addition, since the desk board 42 can be manually folded or unfolded every time when the bed 20 is unfolded or folded, the convenience of the user can be maximized.

Although the preferred embodiments of the present invention have been described above, the scope of rights of the present invention is not limited to these specific embodiments, but can be appropriately changed within the scope of the claims.

10: Wall bed main body 12: Storage groove
20: bed 20a: rotation center axis of the bed
20b: bottom surface of the bed 22: frame
24: Mattress 26: Bar:
28: Support bracket 30: Damper
32: Actuator 40: Desk apparatus
42: desk plate 42a: rotation center axis of the desk plate
50: horizontal holding device 52: first lever (Lever)
52a: rotation center axis of the first lever 54: second lever
54a: rotation center axis of the second lever 55: third lever
56: fourth lever 58: fifth lever
60; Support means 62: Support rod
64: moving means 64a: guide rail
64b: Slider 66: Stopper

Claims

A wall center shaft 20a which is accommodated in the wall bed main body 10 by folding the rotation center shaft 20a around the wall wall main body 10 or from the wall bed main body 10, And a bed (20) spreading on the bottom surface (B) of the room around the center of the floor (B)
A desk plate 42 rotatably installed on a bottom surface 20b of the bed 20 so as to be used in a horizontal state when the bed 20 is folded and stored in the wall bed body 10;
When the bed 20 is extended to the floor surface B, the desk plate 42 is automatically folded to the bed 20 and when the bed 20 is folded to the wall bed body 10, And an automatic folding means for automatically spreading the desk board (42) from the bed (20).

The method according to claim 1,
The automatic folding /
When the bed 20 is folded vertically to the wall bed main body 10 by keeping the posture of the desk board 42 always horizontal regardless of folding or unfolding of the bed 20, When the bed 20 is spread horizontally with respect to the bed 20 and the bed 20 is spread horizontally with respect to the bed 20, , And a horizontal holding device (50) for folding the folded state to a state of folding.

3. The method of claim 2,
The desk plate (42)
And has a rotation center axis 42a parallel to the rotation center axis 20a of the bed 20 so as to rotate with respect to the bed 20 while having a rotation axis parallel to the bed 20. [ A desk-based wall-bed.

The method of claim 3,
The horizontal holding device (50)
And is rotatably installed on a part of the wall bed main body 10 spaced apart from the rotation center shaft 20a of the bed 20 and has a corresponding first lever 52 )Wow;
A second lever 54 pivotally connected to the first lever 52 at one end and rotatably connected to the bed 20 at the other end so as to be paired with the wall bed body 10, ;
A third lever 55 integrally fixed to the rotation center shaft 54a of the second lever 54 so as to rotate integrally with the second lever 54;
A fourth lever 56 rotatably connected to a distal end of the third lever 55 and mating with and corresponding to the portion of the bed 20;
And the other end is integrally fixed to the rotation center shaft 42a of the desk plate 42. The other end is paired with the third lever 55, 5 lever (58);
The first and second levers 52 and 54 together form a parallel crank mechanism together with the corresponding wall bed body 10 and the bed 20, When the bed 20 rotates, the lever 54 moves in parallel with the corresponding wall bed body 10 while maintaining a constant posture and transmits the same to the third lever 55;
The fourth and fifth levers 56 and 58 form a quadrature parallel crank mechanism together with the corresponding third lever 55 and the bed 20, , While the bed (20) is rotated, the desk (42) in a horizontal state integrally connected to the third lever (55) is kept in a constant posture while being parallel to the third lever (55) Is kept in a horizontal state at all times regardless of the rotation of the wall (20).

5. The method according to any one of claims 2 to 4,
Further comprising a supporting means (60) for supporting and supporting the desk table (42) in a horizontal state when the bed (20) is folded in the wall bed body (10)
A pair of support rods 62 rotatably installed on both sides of the distal end portion 42b of the desk plate 42;
A pair of guide rails 64a provided on both sides of the bed 20 so as to correspond to the support rods 62;
When the desk 20 is rotated while the bed 20 is rotating, the end portions 62a of the support rods 62 on both sides of the desk plate 42 A pair of sliders 64b movably connecting the distal end portion 62a of each support rod 62 to each guide rail 64a so as to move along the guide rails 64a, ;
When the bed 20 is folded on the wall bed body 10, the distal end portion 62a of the support rod 62 is prevented from moving downward on the guide rail 64a And a pair of stoppers (66) installed on the floor.

The method according to claim 1,
Further comprising at least one damper (30) rotatably supported on the wall bed body (10) at one end and rotatably supported at the other end by the bed (20);
Wherein the damper (30) alleviates a rotation shock generated when the bed (20) rotates while stretching and contracting when the bed (20) is unfolded.

7. The method according to claim 1 or 6,
Further comprising an actuator (32) one end of which is rotatably supported by the wall-bed body (10) and the other end is rotatably supported by the bed (20);
Wherein the actuator (32) automatically folds or unfolds the bed (20) while stretching and contracting according to an applied driving source.