Bed

Abstract

The present invention relates to a bed comprising: a mattress comprising a top layer for supporting the body of a user and a main body provided on the lower side of the top layer and supporting the top layer; the frame is used for supporting the mattress; one or more air accommodating parts supported by the main body, the one or more accommodating parts being contracted by accommodating air and expanding or discharging air so that the top layer moves in the vertical direction to stretch the body of the user; a pump driven so as to inject air into or discharge air from the one or more air accommodating parts; a lifting part which is supported by the frame and ascends and descends so that the mattress moves in the vertical direction to stretch the body of the user; and a controller for controlling the driving of one or more of the pump and the lifting / lowering part so as to adjust the distance by which the top layer moves upward.

Description

Technical Field

[0001] The present invention relates to a bed. Background Art

[0002] A bed generally has a function of supporting the weight of a lying user. In addition, the bed can stretch the body of the lying user for the user's health. Such a bed may include: a mattress composed of multiple layers for supporting the user; and a structure for lifting and lowering the mattress to stretch the user.

[0003] However, due to the limited structure of existing beds, it is impossible to adjust the stretching strength provided to the user, or it is difficult to provide a stretching with sufficient strength.

[0004] In this regard, in the "Stretching Bed with Airbag and Massage Rod" (Patent Document 1) of Korean Patent Publication No. 10-1679584, the applicant of which is Sungwoo Medical Technology Co., Ltd., a bed is disclosed, which includes: a housing covering the mattress body; an air bag supported on the mattress and inflated to stretch the user and pressurize the upper surface of the housing; and a massage rod moving along the upper surface of the housing to massage the user.

[0005] However, the air bag of the bed of Patent Document 1 is set to inflate to a predetermined height, and the massage rod moves along a preset movement path. Therefore, there is a problem that the moving distances of the air bag and the massage rod in the vertical direction on the upper surface of the housing cannot be adjusted. In other words, the bed in Patent Document 1 cannot adjust the strength of stretching the body of the user supported on the housing.

[0006] In addition, in the bed of Patent Document 1, the lifting distance of the housing that moves upward due to the movement of the massage rod is formed to be smaller than the lifting distance of the housing that moves upward due to the inflation of the air bag. Therefore, there is a problem that the housing cannot be lifted above the height at which the air bag inflates. In other words, there is a problem that the stretching strength of the bed of Patent Document 1 cannot be formed to be greater than the stretching strength of the air bag. Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] An object of an embodiment of the present invention is to provide a bed capable of adjusting the moving distance of the top layer in the vertical direction.

[0009] Means for Solving the Problems

[0010] According to one aspect of the present invention, there is provided a bed, comprising: a mattress including a top layer for supporting a user's body and a body provided on the lower side of the top layer to support the top layer; a frame for supporting the mattress; one or more air receiving portions supported by the body, the one or more receiving portions expanding or contracting by receiving and discharging air, so that the top layer moves in the vertical direction to stretch the user's body; a pump driven to inject air into the one or more air receiving portions or discharge air from the one or more air receiving portions; a lifting portion supported by the frame and moving up and down so that the mattress moves in the vertical direction to stretch the user's body; and a controller for controlling the driving of one or more of the pump and the lifting portion to adjust the moving distance of the top layer moving upward.

[0011] Effects of the Invention

[0012] For the bed according to an embodiment of the present invention, since the moving distance of the top layer in the vertical direction can be adjusted, the stretching strength can be adjusted in stages.

[0013] In addition, since the air receiving portion and the lifting portion are arranged to overlap each other in the vertical direction, and the moving distance of the top layer in the vertical direction can be made greater than the height of the air receiving portion expanding or the rising distance of the lifting portion through the air receiving portion and the lifting portion, the stretching strength can be maximized.

[0014] In addition, since a plurality of lower units can be arranged in the width direction of the bed, so that the user's body is located in the region extending in the vertical direction between the plurality of lower units, the user's body can be stably supported while the plurality of lower units expand.

[0015] In addition, since the upper unit and the lifting member are formed in a strip shape, the area overlapping with the user's body supported on each top layer can be made smaller, so that a stronger stimulus can be provided to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a bed according to an embodiment of the present invention.

[0017] Figure 2 is a view showing Figure 1 the state in which the top layer of the bed moves upward.

[0018] Figure 3 is Figure 1 an exploded perspective view of the bed.

[0019] Figure 4 is Figure 3 an exploded perspective view of the mattress.

[0020] Figure 5 is a view showing the state of the fixing part of the lifting unit of the mattress supported on Figure 4

[0021] Figure 6 is a view showing the state in which the air-containing part of the lifting unit of the mattress supported on Figure 4 has expanded.

[0022] Figure 7 is a perspective view of the air-containing part showing the lower side state of Figure 6 the air-containing part.

[0023] Figure 8 is a cross-sectional view of the bed cut along VIII-VIII of Figure 1 DETAILED DESCRIPTION

[0024] Hereinafter, with reference to the accompanying drawings, specific embodiments for implementing the technical idea of the present invention will be described in detail.

[0025] In addition, when describing the present invention, if it is determined that a detailed description of a related known structure or function may obscure the gist of the present invention, its detailed description will be omitted.

[0026] In addition, when it comes to a certain component being "connected" or "flowing" to another component, it should be understood that it can be connected or flow to the other component, and there may also be other components between the two.

[0027] The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. Unless clearly stated in the context, the singular form includes the plural form.

[0028] In addition, it should be noted in advance that the expressions such as upper side, lower side, and side in this specification are described based on the drawings shown. When the direction of the object changes, it may be represented differently. For the same reason, in the accompanying drawings, some components are enlarged, omitted, or schematically shown, and the dimensions of each component do not exactly reflect the actual dimensions.

[0029] In addition, terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited to the above terms. The terms are only used to distinguish one component from another.

[0030] "Including" used in this specification is intended to specifically describe specific characteristics, regions, integers, steps, actions, elements, and / or components, and does not exclude the existence or addition of other specific features, regions, integers, steps, actions, elements, components, and / or combinations.

[0031] ​​Hereinafter, a bed 1 according to an embodiment of the present invention will be described.

[0032] Refer to Figures 1 to 3 , the bed 1 according to an embodiment of the present invention can support a user lying or sitting on the bed 1. The bed 1 can extend in one direction. When the user lies on the bed 1, the user's head and legs can be placed in one direction. Additionally, one direction can be referred to as the front - rear direction. The bed 1 may include a mattress 100, a frame 200, a lifting unit 300, and a controller 400.

[0033] The mattress 100 can support the user and can provide a buffering feeling to the user. Additionally, the mattress 100 can be supported on the frame 200. Such a mattress 100 may include a topper 110 and a body 120.

[0034] The topper 110 can be provided on the upper side of the body 120 and support the user's body. In other words, the user can sit or lie on the upper surface of the topper 110. Such a topper 110 can be formed integrally with the body 120, but is not limited thereto and can be provided separately from the body 120. For example, the topper 110 can be composed of a blanket, a cushion, etc. that are not formed integrally with the body 120. Additionally, multiple toppers 110 can be formed and stacked in the up - down direction. The topper 110 can have a predetermined thickness.

[0035] Further refer to Figure 4 , the body 120 is provided on the lower side of the topper 110 and supports the topper 110. Additionally, the body 120 can be provided to be located on the upper side of the frame 200. The body 120 can have a predetermined thickness. Such a body 120 can provide a buffering feeling to the user together with the topper 110. Body holes 121, nozzle grooves 122, and flow path grooves 123 can be formed in the body 120.

[0036] The body holes 121 can provide a space into which a certain part of an air flow path 350 described later can be inserted. Such body holes 121 can extend in the up - down direction.

[0037] The nozzle grooves 122 can provide a space capable of accommodating a nipple 320 described later. Such nozzle grooves 122 can be formed by being recessed downward from the upper surface of the body 120.

[0038] The flow path grooves 123 can provide a space into which another part of the air flow path 350 can be inserted. Such flow path grooves 123 can extend from the body holes 121 along the upper surface of the body 120 toward an air accommodation part 310 described later. Additionally, multiple flow path grooves 123 can be formed. Any one of the multiple flow path grooves 123 can be connected to the body holes 121 and the nozzle grooves 122.

[0039] The frame 200 can support the mattress 100. The frame 200 can form the appearance of the bed 1. Such a frame 200 may include a support frame 210 and a rotating frame 220.

[0040] The support frame 210 is disposed on the lower side of the mattress 100 and supports the later-described lifting portion 360 and the air accommodation portion 310 of the lifting unit 300. The support frame 210 may be configured not to rotate. Additionally, frame holes 211 may be formed in the support frame 210.

[0041] The air flow path 350 may penetrate through the frame holes 211. Such frame holes 211 may be provided in the vertical direction of the main body hole 121 and communicate with the main body hole 121.

[0042] The rotating frame 220 may be configured to be rotatable in the vertical direction relative to the support frame 210 about a rotation center extending in the left - right direction. The rotating frame 220 may be disposed on the lower side of the mattress 100. When such a rotating frame 220 rotates, at least a part of the mattress 100 rotates in the vertical direction together with the rotating frame 220, so that the arrangement direction of the mattress 100 can be changed to the vertical direction. The rotating frame 220 and the support frame 210 may be arranged in the front - rear direction. Additionally, the rotating frame 220 may be formed in plurality. Additionally, the support frame 210 may be provided between the plurality of rotating frames 220. However, the present invention is not limited thereto. Additionally, the rotating frame 220 may include a plurality of sub - rotating frames. Any one of the plurality of sub - rotating frames may be configured to be rotatable relative to the support frame 210. Additionally, another one of the plurality of sub - rotating frames may be configured to be rotatable relative to any one of the plurality of sub - rotating frames.

[0043] Further referring to Figures 5 to 7 , the lifting unit 300 can stretch the body of the user supported on the mattress 100 by moving the mattress 100 in the vertical direction. In other words, the lifting unit 300 can move a specified area of the mattress 100 in the vertical direction so as to stretch the user's back, waist, etc. The lifting unit 300 may include an air accommodation portion 310, a nozzle 320, a fixing portion 330, a pump 340, an air flow path 350, a lifting portion 360, and a valve (not shown).

[0044] The air containing part 310 can expand by containing air and contracting by discharging air, so as to stretch the user's body. In other words, the air containing part 310 can expand by containing a specified amount of air. Such an air containing part 310 can be supported on the main body 120. In addition, the air containing part 310 can be arranged between the top layer 110 and the main body 120. The air containing part 310 can be set in the vertical direction area of the support frame 210. When such an air containing part 310 expands, a part of the area of the top layer 110 can be moved upward, and when the air containing part 310 contracts, the raised top layer 110 can be lowered. A part of the area of the top layer 110 moved upward by the expansion of the air containing part 310 can overlap with the vertical direction area of the support frame 210. In addition, the air containing part 310 can be formed into a plurality. At least a part of the plurality of air containing parts 310 can be formed to be different from each other. In addition, at least a part of the plurality of air containing parts 310 can be stacked in the up and down direction. Such a plurality of air containing parts 310 can include a lower unit 311 and an upper unit 312.

[0045] The lower unit 311 can support the left and right sides of the user's body. The lower unit 311 can be arranged on the upper side of the main body 120. In addition, the lower unit 311 can be formed into a plurality. The plurality of lower units 311 can be set to expand or contract independently. Among the plurality of lower units 311, the plurality of lower units 311 can be arranged adjacent to each other in the left and right direction of the bed 1, so that the user's body is located in the area extending in the vertical direction between the plurality of lower units 311. When such a plurality of lower units 311 expand, they can support the left and right sides of the user's body. For example, when the user lies on the mattress 100, the lower unit 311 can support the left and right sides of the user's waist, so that the user's spine is located between the plurality of lower units 311. In addition, a part of the plurality of lower units 311 can overlap with each other in the up and down direction.

[0046] The upper unit 312 may be disposed on the upper side of the lower unit 311. The upper unit 312 may be formed in a shape different from that of the lower unit 311. Such an upper unit 312 may be formed such that the length in its left-right direction is greater than the length in its front-rear direction. For example, the upper unit 312 may be in the shape of a bar. The body of the user being supported may be located in the region extending vertically from the upper unit 312 through such an upper unit 312. In addition, the length of the upper unit 312 in the left-right direction may be formed to be greater than the length of the lower unit 311 in the left-right direction. In addition, the length of the upper unit 312 in the left-right direction may be less than the sum of the lengths of the plurality of lower units 311 in the left-right direction. Such an upper unit 312 may be disposed on the upper surface of the plurality of lower units 311. In addition, the height of the expanded upper unit 312 may be less than the height of the expanded lower unit 311. However, the present invention is not limited thereto and may be formed to be different from each other. In addition, when viewed from above, the left end of the upper unit 312 may be disposed at a position more to the left than the center of the lower unit 311 disposed on the left among the plurality of lower units 311, and the right end of the upper unit 312 may be disposed at a position more to the right than the center of the lower unit 311 disposed on the right among the plurality of lower units 311.

[0047] The nozzle 320 may flow the air flowing in the air flow path 350 into the air accommodation part 310, or may flow the air discharged from the air accommodation part 310 into the air flow path 350. The nozzle 320 may be connected to the air accommodation part 310 and the air flow path 350. The nozzle 320 may be connected to the lower surface of the air accommodation part 310. For example, the nozzle 320 may be ultrasonically welded to the lower surface of the air accommodation part 310 and thus fixed to the lower surface of the air accommodation part 310. In addition, the nozzle 320 may be accommodated in the nozzle groove 122.

[0048] The fixing part 330 may fix the air accommodation part 310 to the main body 120. Such a fixing part 330 may be disposed on the upper surface of the main body 120. In addition, the fixing part 330 may be in the shape of a sheet. For example, the fixing part 330 may be heat-sealed to the main body 120 and may be connected to the air accommodation part 310 through a hook-and-loop fastener. When air flows into the lower unit 311 through such a fixing part 330, the lower unit 311 may be supported on the main body 120 and expand. In addition, a cutout may be formed in the fixing part 330 such that a part of the nozzle 320 and the air accommodation part 310 communicate with each other. Such a cutout may communicate with the nozzle groove 122. The nozzle 320 may pass through the cutout and be accommodated in the nozzle groove 122.

[0049] The pump 340 can be driven to inject air into the air storage unit 310 or discharge air from the air storage unit 310. In other words, the pump 340 can inject air into one or more of the lower unit 311 and the upper unit 312, or suck air from one or more of the lower unit 311 and the upper unit 312. The pump 340 can be disposed on the lower side of the support frame 210.

[0050] With further reference to Figure 8 , the air flow path 350 can provide a path for air to flow. The air flow path 350 can be connected to the pump 340 and the air storage unit 310. One side of such an air flow path 350 can be connected to the pump 340, and the other side opposite to this side can be connected to the air storage unit 310. The air flow path 350 can pass through the main body hole 121 and the frame hole 211. One side of the air flow path 350 can be disposed at a position lower than the other side. In addition, the portion of the air flow path 350 located on the upper side of the main body 120 can be inserted into the nozzle groove 122.

[0051] The lifting unit 360 can be lifted and lowered to move the mattress 100 in the vertical direction, thereby stretching the user's body. Such a lifting unit 360 can be supported on the frame 200. In other words, the lifting unit 360 is supported on the support frame 210 and lifts the lower surface of the main body 120 upward, so that the top layer 110 can be lifted and lowered. The lifting unit 360 can be arranged such that the air storage unit 310 overlaps with the region extending vertically from the lifting unit 360. The region of the main body 120 that overlaps with the vertical region of the support frame 210 can be lifted and lowered by such a lifting unit 360.

[0052] In addition, when the lifting unit 360 is lifted and lowered, the air storage unit 310 can also be lifted and lowered together with the mattress 100. Such a lifting unit 360 and the air storage unit 310 can stretch the same body part of the user, but are not limited thereto. In addition, the lifting distance of the lifting unit 360 can be formed to be less than the height of the expansion of the air storage unit 310, but is not limited thereto. The lifting unit 360 can include a lifting member 361 and a driving unit 362.

[0053] The lifting member 361 can move in a manner that moves the mattress 100 in the vertical direction. Such a lifting member 361 can be supported on the support frame 210 in a manner that can move in the vertical direction. The length of the lifting member 361 in the left-right direction can be greater than the length in the front-rear direction. For example, the lifting member 361 can be formed in a strip shape.

[0054] The driving unit 362 can provide a driving force for lifting and lowering the lifting member 361. In other words, when the driving unit 362 is driven, the lifting member 361 can be lifted and lowered. For example, the driving unit 362 can be a motor. In addition, the driving unit 362 can be set to adjust the lifting distance of the lifting member 361. For example, the driving unit 362 can provide a driving force for moving the lifting member 361 by a first lifting distance or a distance greater than the first lifting distance.

[0055] The valve can be opened and closed (opened and closed) in a manner that allows or restricts the flow of air in the air flow path 350. In other words, the valve can be opened and closed so that air is injected into one or more of the lower unit 311 and the upper unit 312, or air is discharged from one or more of the lower unit 311 and the upper unit 312. A plurality of such valves can be provided. In addition, the valve can be opened and closed so that air is independently injected into the lower unit 311 and the upper unit 312, or air is discharged from the lower unit 311 and the upper unit 312. For example, when any one of the lower unit 311 and the upper unit 312 expands through such a valve, the other of the lower unit 311 and the upper unit 312 can expand or may not expand.

[0056] The controller 400 can control one or more of the pump 340 and the lifting unit 360 to adjust the moving distance of the movement above the top layer 110. In other words, the controller 400 can control the pump 340 to expand the air containing portion 310, or can control the driving unit 362 to lift and lower the lifting member 361. Such a controller 400 can control the pump 340 so that one or more air containing portions 310 expand, thereby moving the top layer 110 upward by a first moving distance. The controller 400 can control the pump 340 and the lifting unit 360 so that the lifting unit 360 rises in a state where one or more air containing portions 310 expand, thereby moving the top layer 110 upward by a second moving distance greater than the first moving distance. In other words, the second moving distance of the top layer 110 can be greater than the height of the expanded air containing portion 310 or the rising distance of the lifting unit 360.

[0057] In addition, the controller 400 can sequentially control the air containing portion 310 and the lifting unit 360. In other words, the controller 400 can control the pump 340 and the lifting unit 360, whereby after the top layer 110 rises through any one of one or more air containing portions 310 and the lifting unit 360, the top layer 110 further rises through the other of one or more air containing portions 310 and the lifting unit 360.

[0058] In addition, the controller 400 can control the valve such that at least a part of the plurality of air containing portions 310 expands differently from each other. For example, the controller 400 can control the valve and the pump 340 such that air is injected only into either the lower unit 311 or the upper unit 312. In addition, the controller 400 can control the valve such that the plurality of air containing portions 310 expand sequentially. In other words, the controller 400 can control the pump 340 and the valve such that the lower unit 311 and the upper unit 312 expand sequentially. With such a controller 400, after air is injected into either the lower unit 311 or the upper unit 312, air can be injected into the other of the lower unit 311 and the upper unit 312.

[0059] Such a controller 400 can control the pump 340 and the valve such that the top layer 110 rises in a first step through the lower unit 311, and can control the pump 340 and the valve such that the top layer 1102 rises in a second step through the upper unit 312. In addition, the controller 400 can control the driving unit 362 such that the top layer 110 rises in a third step through the lifting member 361. The controller 400 can control the driving unit 362, the pump 340, and the valve such that the top layer 110 rises in a fourth step through the lower unit 311, the upper unit 312, and the lifting member 361. However, the above first step to fourth step are only examples, and the idea of the present invention is not limited thereto.

[0060] In addition, the controller 400 can control the rotating frame 420 such that the rotating frame 420 rotates relative to the support frame 410. The controller 400 can control the driving force of one or more motors provided additionally to rotate the rotating frame 420.

[0061] Hereinafter, the operation and effects of the bed 1 according to an embodiment of the present invention will be described.

[0062] In the bed 1 according to an embodiment of the present invention, the controller 400 can adjust the moving distance of the top layer 110 moving upward by controlling the driving of the pump 340 and the lifting unit 360, and thus can adjust the intensity for stretching the user's body in stages.

[0063] In addition, since the air containing portion 310 and the lifting unit 360 can be arranged to overlap each other in the vertical direction, and the moving distance of the top layer 110 can be increased by the air containing portion 310 and the lifting unit 360, the stretching intensity felt by the user can be maximized.

[0064] In addition, since the plurality of lower units 311 can be arranged in the width direction of the bed 1 such that the user's body is located in the region extending vertically between the plurality of lower units 311, when the plurality of lower units 311 expand, the user's body can be stably supported.

[0065] In addition, since the upper unit 312 and the lifting member 361 are formed in a strip shape, the area overlapping with the body of the user supported on each top layer 110 can be made smaller, and thus a stronger stimulus can be provided to the user.

[0066] In addition, the moving distance by which the top layer 110 moves upward can be formed to be greater than the height of the inflated air accommodation part 310 or the rising distance of the lifting part 360.

[0067] In addition, since the rotating frame 220 can rotate relative to the support frame 210, the shape of the mattress 100 can be changed so that the user is supported on the mattress 100 in a desired posture.

[0068] Although the embodiments of the present invention are described by specific embodiments, this is only an example, and the present invention is not limited thereto. It should be understood to have the broadest scope according to the technical idea disclosed in this specification. Those skilled in the art can perform the shape patterns not shown by combining / replacing the disclosed embodiments, but this does not exceed the scope of the present invention. In addition to this, those skilled in the art can easily change or modify the disclosed embodiments based on this specification, and obviously such changes and modifications also belong to the scope of the rights of the present invention.

Claims

1. A bed, wherein: include: A mattress, comprising a top layer for supporting a user's body and a main body disposed at a lower side of the top layer and supporting the top layer; a frame for supporting the mattress; One or more air receiving parts supported on the main body, the one or more receiving parts contract by receiving air and expanding or exhausting the air, so that the top layer moves in the up-down direction to stretch the user's body; a pump driven in a manner to inject air into the one or more air receiving portions or to discharge air from the one or more air receiving portions; A lifting part, supported by the frame and lifting and lowering, so that the mattress moves in an up-and-down direction to stretch the user's body; as well as The controller controls the driving of at least one of the pump and the lifting unit to adjust the moving distance of the top layer moving upward.

2. The bed according to claim 1, wherein: The air receiving portion is arranged to overlap with a region extending in a vertical direction from the lifting portion so that the air receiving portion moves upward together with the mattress when the lifting portion moves upward.

3. The bed according to claim 1, wherein: The lifting part comprises: a lifting member supported on the frame in a manner capable of moving in an up-down direction, wherein the mattress is moved in the up-down direction by movement of the lifting member; and The driving unit provides driving force to the lifting member.

4. The bed according to claim 1, wherein: The controller controls the driving of the pump to expand the one or more air receiving parts so that the top layer moves upward by a first moving distance. The controller controls the driving of the pump and the lifting unit to expand the one or more air receiving units and to raise the lifting unit, so that the top layer moves upward by a second moving distance greater than the first moving distance.

5. The bed according to claim 1, wherein The controller controls driving of the pump and the lifting part so that after the top layer is lifted by any one of the one or more air receiving parts and the lifting part, the top layer is further lifted by the other one of the one or more air receiving parts and the lifting part.

6. The bed according to claim 1, wherein: Also includes: an air flow path for communicating the pump with the air receiving portion, and a valve that allows or restricts air flow in the air flow path by opening and closing the valve; The one or more air receiving parts include: The lower unit, and an upper unit, arranged on the upper side of the lower unit; The controller expands the lower unit and the upper unit sequentially by controlling driving of the pump and the valve.

7. The bed according to claim 6, wherein: The height of the expanded lower unit is formed to be the same as the height of the expanded upper unit.

8. The bed according to claim 1, wherein The lifting distance of the lifting portion is formed to be smaller than the height of the one or more air receiving portions to be expanded.

9. The bed according to claim 6, wherein: The lower unit is formed into a plurality of The plurality of lower units are adjacently arranged in a width direction of the bed so that the body of the user supported on the top layer is located in a region extending in a vertical direction between the plurality of lower units.

10. The bed according to claim 6, wherein: The upper unit is formed in a strip shape extending in a width direction of the bed so that the body of the user supported on the top layer is located in a region of the upper unit extending in a vertical direction.

11. The bed according to claim 1, wherein Also included is an air flow path, the air flow path being connected to the pump and the one or more air receiving parts and providing a passage for air to flow, A frame hole is formed in the frame, A main body hole is formed in the main body, The frame hole and the main body hole are connected to each other, The air flow path passes through the frame hole and the body hole and is connected to the one or more air receiving parts.

12. The bed according to claim 1, wherein The lifting unit lifts and lowers the top layer by lifting and lowering the lower surface of the main body upward.

13. The bed according to claim 1, wherein The framework includes: a supporting frame for supporting the lifting part and the one or more air receiving parts; and One or more rotating frames are arranged to be rotatable relative to the supporting frame.

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