Bed

Abstract

The invention provides a bed which can reduce cost and is easy to assemble and disassemble. A plurality of components of the bed (1) comprise a base frame (10) in which roller connecting holes (16e) are formed, a center frame (30) in which front connecting holes (31a) are formed, a head frame (20) in which head connecting holes (21a) are formed, and a first knob bolt (50). When the base frame (10), the center frame (30), and the head frame (20) are combined at preset mutual positions, the roller connection hole (16e), the front connection hole (31a), and the head connection hole (21a) communicate with each other. By inserting a first knob bolt 50 into a roller connection hole 16e, a front connection hole 31a, and a head connection hole 21a, the base frame 10, the center frame 30, and the head frame 20 are connected to each other such that they are prevented from being separated from preset mutual positions.

Description

Technical Field

[0001] This application relates to a bed. Background Technology

[0002] Many beds are designed to be disassembled and assembled for easy transport, storage, and access to and from homes or buildings. Nursing beds, in particular, are often rented by end-users due to their complex structure, high cost, and short lifespan compared to regular beds. Nursing bed rental companies frequently disassemble and reassemble these beds. Traditional nursing beds require numerous additional connectors, such as connecting pins or fastening bolts, to connect and secure various components.

[0003] For example, when assembling a bed, pins and cotter pins to prevent them from falling off are required as additional components in order to connect the base frame and the center frame.

[0004] In addition, Patent Document 1 discloses a structure in which an automatic locking mechanism consisting of a locking member, a helical spring, etc. is provided on the central frame, and when the base frame is connected to the central frame, the central frame is automatically locked to the base frame by the automatic locking mechanism.

[0005] [Existing Technical Documents] [Patent Document 1] Japanese Patent Application No. 2022-013893 Application content [The problem to be solved in the application] Including connectors for joining components such as frames as additional parts increases costs, requiring a separate box to house them. Furthermore, having connectors as extra parts adds assembly steps and time. Additionally, there is a risk of connectors being lost.

[0006] Furthermore, the bed in Patent Document 1, by providing an automatic locking mechanism, not only increases the number of components required to construct the mechanism, thus increasing costs, but also, due to the increased complexity of the mechanism, may experience unexpected mechanical failures. Moreover, because the bed with the automatic locking mechanism employs a different assembly method than before, the operator needs to acquire new knowledge and skills when assembling the bed.

[0007] Therefore, the purpose of this application is to provide a bed that can reduce costs and can be easily assembled and disassembled.

[0008] [Problem-solving methods] According to one embodiment, a bed can be disassembled into multiple components and assembled by combining and connecting the multiple components in preset mutual positions; the multiple components include a first component having a first connecting hole, a second component having a second connecting hole, a third component having a third connecting hole, and a connector; when the first component, the second component, and the third component are combined in the preset mutual positions, the first connecting hole, the second connecting hole, and the third connecting hole are in communication with each other; by inserting the connector into the first connecting hole, the second connecting hole, and the third connecting hole, the first component, the second component, and the third component are connected to each other, so that they are prevented from separating from the preset mutual positions.

[0009] By engaging the first joint portion provided in the first component and the second joint portion provided in the second component, the first component and the second component are combined at a predetermined relative position.

[0010] The first component is a base frame for the lifting bed, the second component is a central frame supported by the base frame, and the third component is at least one of a head frame and a foot frame connected to the central frame.

[0011] The first joint is a rotating shaft part disposed on the base frame. The first joint abuts against the central frame to raise the bed, and the first connecting hole passes through the rotating shaft part; the second joint is a shaft retaining part for accommodating and retaining the rotating shaft part.

[0012] The shaft retaining part has an arched main body that can accommodate the rotating shaft.

[0013] The center frame includes a protrusion and a loading plate; the head frame or foot frame includes a locking part; when the head frame or foot frame is placed on the loading plate, it is locked to the protrusion by the locking part, and the center frame and the head frame or foot frame are combined in a preset mutual position.

[0014] [Technical Effects] This application provides a bed that can reduce costs and can be easily assembled and disassembled. Attached Figure Description

[0015] Figure 1 This is an exploded view of a bed according to an embodiment of this application.

[0016] Figure 2 This is a schematic diagram showing the state in which the base frame, the center frame, and the base frame are connected by the first knob bolt and prevented from separating from their preset mutual positions.

[0017] Figure 3 This is a schematic diagram of the shaft retainer.

[0018] Figure 4 This is a schematic diagram showing the state in which the roller is housed in the main body of the shaft retainer.

[0019] Figure 5 This is a schematic diagram of the process of connecting the head frame to the center frame.

[0020] Figure 6 This is a schematic diagram of the process of connecting the head frame to the center frame.

[0021] Figure label: 1: Bed; 2: Bottom; 2A: Backrest bottom; 2B: Waist bottom; 2C: Knee and leg bottom; 3: Bottom; 4: Main frame; 10: Base frame; 11: Base; 11A: First front and rear rods; 11B: First left and right rods; 11C: Guide member; 12: X-shaped linkage mechanism; 13: Actuator; 14: Fixed leg; 15A: First link; 15B: Second link; 15C: Pin; 16A, 16B, 16C: Connecting rod; 16D: Roller support member; 16D: Fixed part; 16D: Protrusion; 16e: Roller connecting hole; 16F: Roller; 17: Guided part; 20: Head frame; 21: Third front and rear rods; 21a: Head connecting hole; 21b: Through hole; 22: Third left... Right rod, 23: First locking part, 24: Second connecting member, 30: Central frame, 31: Second front and rear rods, 31a: Front connecting hole, 31b: Rear connecting hole, 31c: Through hole, 32: Second left and right rods, 33: Guide member, 34: Shaft holding part, 34A: Main body part, 34B: Lower extension part, 34B: Inclined part, 34B: Anti-detachment part, 34C: Temporary placement part, 35: First connecting member, 36A: Front protrusion, 36B: Rear protrusion, 37A: Front loading plate, 37B: Rear loading plate, 40: Foot frame, 41: Fourth front and rear rods, 41a: Foot connecting hole, 42: Fourth left and right rods, 43: Second locking part, 50: First knob bolt, 51: Second knob bolt. Detailed Implementation

[0022] Hereinafter, embodiments of this application will be described with reference to the accompanying drawings.

[0023] Figure 1 This is an exploded view of bed 1 according to this embodiment. For example, bed 1 is a nursing bed used in a nursing facility. Bed 1 has a generally rectangular shape with a longer longitudinal direction in a planar view to support the body of a person lying horizontally. In this specification, the direction of the longer side of bed 1 is defined as the front-back direction, the head side of bed 1 is defined as the front side, and the foot side of bed 1 is defined as the rear side. Furthermore, the direction orthogonal to the front-back direction of bed 1 is the left-right direction.

[0024] The bed 1 mainly includes: a bottom 2 that can be separated and connected to each other, a frame 3, and plates (not shown) set at the front and rear ends of the bed 1.

[0025] The base 2 supports the mattress (not shown) from below, allowing the person lying down to rest. The base 2 comprises multiple components, such as a back base 2A, a lumbar base 2B, and a knee and leg base 2C. In the base 2, these components are arranged sequentially from front to back in the front-to-back direction: back base 2A, lumbar base 2B, and knee and leg base 2C. The angles of the back base 2A and knee and leg base 2C relative to the lumbar base 2B are variable. That is, the base 2 is flexible. The base 2 can be made of, for example, metal or synthetic resin. The knee and leg base 2C can consist of a knee base for placing the knee and a leg base for placing the leg.

[0026] Frame 3 is roughly rectangular in shape with a longer longitudinal axis in a planar view, and supports base 2 from below. Frame 3 includes multiple sub-frames, such as a base frame 10 that can be separated and connected to each other, a head frame 20 that can be separated and connected to each other, a center frame 30, and a foot frame 40. Frame 3 also includes a first knob bolt 50 and a second knob bolt 51 as connecting elements. When disassembly is required for transportation, etc., bed 1 is disassembled into multiple main components, namely, base frame 10, head frame 20, center frame 30, foot frame 40, backrest base 2A, waist base 2B, and knee and leg base 2C. Then, when assembling bed 1, the main components 10-40 and 2A-2C are combined and connected to each other in preset positions, thereby completing the assembly of bed 1.

[0027] <Base Frame 10> The base frame 10 is a frame that serves as the base of the bed 1. In a planar view, the base frame 10 has a longitudinally elongated, generally rectangular shape and supports the main frame 4 from below. In this embodiment, the base frame 10 is equivalent to the first component.

[0028] The base frame 10 includes a base 11 disposed on the floor (mounting surface), an X-shaped linkage mechanism 12 serving as a lifting mechanism (movable mechanism), and an actuator 13.

[0029] The base 11 includes a pair of first front and rear rods 11A extending in the front-rear direction and a pair of first left and right rods 11B extending in the left-right direction. The pair of first front and rear rods 11A are arranged at a predetermined interval in the left-right direction, and the pair of first left and right rods 11B are mounted on the front and rear parts of the pair of first front and rear rods 11A. Fixed legs 14 are respectively installed at the front and rear ends of each first front and rear rod 11A. A guide member 11C is provided on the rear inner side of the pair of front and rear rods 11A. The guide member 11C supports the connecting rod 16C of the X-shaped linkage mechanism 12 relative to the base 11, allowing it to slide in the front-rear direction. The lower part of the X-shaped linkage mechanism 12 is connected to the base 11, and the upper part is connected to the central frame 30 (which is equivalent to the second component in this embodiment). The X-shaped linkage mechanism 12 mainly includes a pair of first links 15A and second links 15B, and a plurality of connecting rods 16A, 16B, and 16C. The first links 15A and second links 15B extend in the front-rear direction, respectively, and are rotatably connected to each other by a pin 15C at approximately the center in the front-rear direction. That is, the pair of first links 15A and second links 15B are connected in an X-shape with the pin 15C as the center in the side view. The first links 15A and second links 15B are spaced apart from each other in the left-right direction.

[0030] The front ends of a pair of first connecting rods 15A are rotatably connected to the front left and right first rods 11B. The rear ends of the pair of first connecting rods 15A are connected via connecting rods 16A. The front ends of a pair of second connecting rods 15B are connected via connecting rods 16B. The rear ends of the pair of second connecting rods 15B are connected via connecting rods 16C. Both ends of the connecting rods 16C are accommodated in guide members 11C so that they can slide in the front-rear direction. Therefore, the rear ends of the second connecting rods 15B can move and rotate in the front-rear direction along the first front and rear rods 11A. A guided portion 17 with rollers is provided on the outer side of the rear ends of the pair of first connecting rods 15A.

[0031] Figure 2 This is a schematic diagram showing the base frame 10, the central frame 30 (equivalent to the second component in this embodiment), and the head frame 20 (equivalent to the third component in this embodiment) connected by a first knob bolt 50, thereby preventing them from separating from their preset relative positions. Figure 2 As shown, roller support members 16D are provided at both ends of the connecting rod 16B in the left-right direction. The roller support member 16D includes a fixing part 16D1 that is fixed to the inner side of the connecting rod 16B by welding or other means, and a protrusion 16D2 that protrudes outward from the fixing part 16D1. The outer diameter of the protrusion 16D2 is smaller than the outer diameter of the fixing part 16D1. A roller connecting hole 16e is formed in the roller support member 16D, passing through in the left-right direction. A roller 16F is provided in the protrusion 16D2. The protrusion 16D2 of the roller support member 16D is inserted into the interior of the roller 16F, and the outer end of the roller connecting hole 16e opens outward through a hole on the outer surface of the roller 16F. The roller 16F can rotate relative to the protrusion 16D2. The roller 16F is equivalent to a rotating shaft (first joint), and the roller connecting hole 16e is equivalent to a first connecting hole.

[0032] like Figure 1As shown, connecting rod 16A moves up and down using actuator 13. This drives the X-shaped linkage 12, causing the first link 15A and the second link 15B to rotate, and the upper ends of the first link 15A and the second link 15B to change position in the vertical direction. Therefore, the main frame 4 moves vertically relative to the base 11 of the base frame 10.

[0033] <Main Frame 4> The main frame 4 is roughly rectangular in shape with a longer longitudinal dimension in a planar view. The main frame 4 supports the bottom 2 from below. The main frame 4, namely the head frame 20, the center frame 30, and the foot frame 40, is connected to the base frame 10, thereby allowing the bottom 2 to move vertically. In this embodiment, the base frame 10, the head frame 20, and the foot frame 40 are each connected to the center frame 30. The main frame 4 can be made of, for example, metal or synthetic resin.

[0034] <Central Frame 30> The central frame 30 is a frame that supports the lower waist 2B from below. The head frame 20 is connected to the front of the central frame 30, and the foot frame 40 is connected to the rear of it. The central frame 30 is connected to the X-shaped linkage 12 of the base frame 10 and is capable of vertical movement.

[0035] The central frame 30 includes a pair of second front and rear rods 31 extending in the front-rear direction and a pair of second left and right rods 32 extending in the left-right direction. The pair of second front and rear rods 31 are arranged at a predetermined interval in the left-right direction, and the pair of second left and right rods 32 are respectively installed at the central and rear portions of the second front and rear rods 31. A guide member 33 is disposed on the inner side of the rear portion of each second front and rear rod 31. The guided portion 17 at the rear end of the first connecting rod 15A is slidably engaged with the guide member 33 in the front-rear direction.

[0036] A shaft retaining part 34 (equivalent to a second joint in this embodiment) is provided on the inner side of the front part of each second front and rear rod 31. Figure 3 This is an explanatory diagram of the shaft retaining part 34. (See diagram for example.) Figure 3 As shown, the shaft retaining part 34 includes a main body part 34A, an anti-detachment part 34B, and a temporary placement part 34C. The main body part 34A has a generally arched shape and can accommodate the roller 16F inside it. Figure 2Since the roughly arched inner diameter is essentially the same as the outer diameter of the roller 16F, the front connecting hole 31a and the roller connecting hole 16e are approximately concentric when accommodated, eliminating the need for alignment. The anti-detachment part 34B is connected to the front end of the main body 34A. The anti-detachment part 34B includes a lower extension 34B1 extending downward from the front end of the main body 34A and an inclined part 34B2 extending rearward from the lower end of the lower extension 34B1. The inclined part 34B2 is located below the main body 34A and slopes downward (away from the main body 34A) as it extends rearward. The temporary placement part 34C is connected to the rear end of the main body 34A and extends rearward.

[0037] like Figure 1 As shown, each of the second front and rear rods 31 has a front connecting hole 31a and a rear connecting hole 31b that extend in the left-right direction. The front connecting hole 31a is for connecting the head frame 20 to the center frame 30. The rear connecting hole 31b is for connecting the foot frame 40 to the center frame 30.

[0038] Combination Figure 2 This describes the detailed structure of the front connecting hole 31a. For example... Figure 2 As shown, a through hole 31c extending in the left-right direction is formed at the front of each second front and rear rod 31. A cylindrical first connecting member 35 is provided in the through hole 31c, and a front connecting hole 31a is provided in the first connecting member 35. An internal thread is provided on the inner circumferential surface of the first connecting member 35. The front connecting hole 31a opens inside the main body portion 34A of the shaft retaining portion 34. The front connecting hole 31a is equivalent to the second connecting hole. The rear connecting hole 31b also has the same structure as the front connecting hole 31a.

[0039] like Figure 1 As shown, each of the second front and rear bars 31 has a front protrusion 36A and a rear protrusion 36B projecting outward on its outer surface. The front protrusion 36A is a protrusion for mounting the head frame 20 to the center frame 30. The rear protrusion 36B is a protrusion for mounting the foot frame 40 to the center frame 30. The front protrusion 36A is located in front of the center of the second front and rear bars 31, and the rear protrusion 36B is located behind the center of the second front and rear bars 31.

[0040] Each of the second front and rear poles 31 has a forward-projecting front loading plate 37A and a rear loading plate 37B on its lower surface. The front loading plate 37A is a flat plate for mounting the head frame 20 to the center frame 30. The rear loading plate 37B is a flat plate for mounting the foot frame 40 to the center frame 30. The front loading plate 37A is located in front of the front protrusion 36A, and the rear loading plate 37B is located behind the rear protrusion 36B.

[0041] <Headframe 20> The head frame 20 is a frame that supports the backrest bottom 2A from below. A headboard (not shown) is mounted on the front end of the head frame 20. The head frame 20 includes a pair of third front-rear rods 21 extending in the front-back direction and a pair of third left-right rods 22 extending in the left-right direction. The pair of third front-rear rods 21 are arranged at a predetermined interval in the left-right direction, and the pair of third left-right rods 22 are mounted at the front and center of the third front-rear rods 21. In addition, the head frame 20 may also include an arm mechanism and an actuator as a lifting mechanism (movable mechanism) for lifting the backrest bottom 2A.

[0042] A first locking part 23 (equivalent to a locking part in this embodiment) is provided at the rear end of each third front and rear rod 21. The first locking part 23 is concave in shape with a rearward opening and can accommodate and lock the front protrusion 36A on the outer surface of each second front and rear rod 31.

[0043] Each of the third front and rear rods 21 is provided with a head connection hole 21a that extends in the left-right direction. The head connection hole 21a is a hole for connecting the magnetic head frame 20 to the central frame 30. Figure 2 The detailed structure of the head connection hole 21a is described below. A through hole 21b extending in the left-right direction is provided at the rear of each third front and rear rod 21. A cylindrical second connecting member 24 is provided in the through hole 21b, and the second connecting member 24 has the head connection hole 21a. A portion of the second connecting member 24 protrudes to the outside of the third front and rear rod 21. The head connection hole 21a is equivalent to the third connection hole.

[0044] <Foot Frame 40> like Figure 1 As shown, the foot frame 40 is a frame that supports the bottom of the knees and legs 2C from below. A bed tailboard (not shown) is installed at the rear end of the foot frame 40. The foot frame 40 includes a pair of fourth front and rear bars 41 extending in the front-back direction and a pair of fourth left and right bars 42 extending in the left-right direction. The pair of fourth front and rear bars 41 are arranged at a predetermined interval in the left-right direction, and the pair of fourth left and right bars 42 are installed at the center and rear of the fourth front and rear bars 41.

[0045] A second locking part 43 is provided at the front end of each fourth front and rear rod 41. The second locking part 43 is concave and opens forward, and can accommodate and lock the rear protrusion 36B on the outer surface of each second front and rear rod 31. Each fourth front and rear rod 41 is provided with a foot connection hole 41a that extends in the left-right direction. The foot connection hole 41a has the same structure as the head connection hole 21a.

[0046] <Assembly Instructions for Bed 1> Next, the assembly method of bed 1 in this embodiment will be described. Figure 4 This is a schematic diagram showing the state in which the roller 16F is housed in the main body 34A of the shaft retaining part 34. Figure 5 and Figure 6 This is a diagram illustrating the steps of connecting the head frame 20 to the center frame 30.

[0047] The operator connects the center frame 30 to the base frame 10. Specifically, the operator places the guided portion 17 at the rear end of each first link 15A into the guide member 33 of each second front and rear link 31, as follows. Figure 4 As shown, the roller 16F at the front end of the second connecting rod 15B is placed in the shaft holding part 34 of the second front and rear rods 31. At this time, the temporary placement part 34C is placed on the roller 16F, and then the central frame 30 is moved backward so that the roller 16F is placed in the main body part 34A. In this way, the central frame 30 can be assembled onto the base frame 10.

[0048] Next, the operator connects the head frame 20 to the center frame 30. For example... Figure 5 As shown in (a), the operator locks the first locking part 23 of each third front and rear lever 21 onto the front protrusion 36A of each second front and rear lever 31, as follows: Figure 5 As shown in (b), the operator places each third front and rear bar 21 on the front loading plate 37A of each second front and rear bar 31, with each third front and rear bar 21 and each second front and rear bar 31 overlapping in the left-right direction. Therefore, the base frame 10, the center frame 30, and the head frame 20 are assembled in a preset mutual position. In this state, as... Figure 2 As shown. The roller connection hole 16e of the base frame 10, the front connection hole 31a of the center frame 30, and the head connection hole 21a of the head frame 20 are arranged in a straight line in the left-right direction and are connected to each other. In this way, the first locking part 23 at the end of the head frame 20 is engaged with the front protrusion 36A of the center frame 30 and placed on the front loading plate 37A. Thus, the connection holes between the frames can be aligned with each other, and the head frame 20 can be easily connected using the first knob bolt 50 without having to support the head frame 20 by hand.

[0049] Next, as Figure 2 and Figure 6 As shown, the first knob bolt 50 (equivalent to a connector in this embodiment) is inserted from the outside into the head connecting hole 21a, the front connecting hole 31a, and the roller connecting hole 16e, and the external thread of the first knob bolt 50 engages with the internal thread of the first connecting member 35. In this way, the base frame 10, the center frame 30, and the head frame 20 are connected to each other, preventing them from separating from their predetermined relative positions. The end of the first knob bolt 50 is located in the roller connecting hole 16e, but does not contact the inner circumferential surface of the roller connecting hole 16e (away from the inner circumferential surface). It is worth mentioning that, in this embodiment, as... Figure 2As shown, the first knob bolt 50 is pre-inserted into the head connection hole 21a, and an E-ring 51A is provided on the inner side of the third front and rear rods 21, so that it will not fall off the head frame even when the screw is loosened. That is, the outer diameter of the E-ring 51A is larger than the inner diameter of the outer end of the second connecting part 24.

[0050] Next, the operator connects the foot frame 40 to the center frame 30. The operator locks the second locking part 43 of each fourth front and rear bar 41 onto the rear protrusion 36B of each second front and rear bar 31, places each fourth front and rear bar 41 on the rear loading plate 37B of each second front and rear bar 31, and overlaps each fourth front and rear bar 41 and each second front and rear bar 31 in the left-right direction. In this state, the rear connecting hole 31b of the center frame 30 and the foot connecting hole 41a of the foot frame 40 are aligned in a straight line in the left-right direction and communicate with each other. In this way, the second locking part 43 at the distal end of the foot frame 40 is engaged with the rear protrusion 36B of the center frame 30 and placed on the rear loading plate 37B, so that the connecting holes between the frames can be aligned with each other, and the foot frame 40 can be easily connected with the second knob bolt 51 without manually supporting the foot frame 40.

[0051] The second knob bolt 51 is inserted from the outside into the foot connection hole 41a and the rear connection hole 31b, so that the external thread of the second knob bolt 51 engages with the internal thread of the connecting member in the rear connection hole 31b. In this way, the foot frame 40 is fixed to the center frame 30.

[0052] The operator installs the bottom plate 2 and the plate (not shown) onto the assembled frame. Thus, frames 10 to 40 are assembled, and bed 1 is assembled.

[0053] As described above, the bed 1 according to this embodiment includes multiple components, including a base frame 10 (equivalent to a first component with a first connecting hole) having a roller connection hole 16e, a center frame 30 (equivalent to a second component with a second connecting hole) having a front connecting hole 31a, a head frame 20 (equivalent to a third component with a third connecting hole) having a head connecting hole 21a, and a first knob bolt 50 (equivalent to a connector). Thus, through normal assembly operations as described above, the base frame 10, center frame 30, and head frame 20 can be positioned at preset relative positions (the first, second, and third connecting holes are substantially concentric), and connected in a manner that avoids separation from their relative positions. In other words, when assembling frames 10 to 30, the operator can omit the need to correct the position of each frame, and also avoid the very tedious steps of fixing each component with connectors that are separate components. Therefore, the operator can easily perform the assembly operation of the bed 1, and the assembly time can be shortened.

[0054] Furthermore, in this embodiment, the connector, which was previously a separate component, is prevented from detaching from the head frame by an E-ring or the like. Therefore, no additional separate connector is needed to assemble the frames 10 to 30 of the bed 1, thereby preventing the loss of connectors and other components during the assembly of the bed 1. In addition, since there is no need for connectors as separate components and boxes for storing them, costs can be reduced.

[0055] Furthermore, since an automatic locking function is not required, the number of parts is not increased, and unexpected mechanical failures due to the complexity of the mechanism are avoided. Moreover, since bed 1 can be assembled and disassembled using the same normal methods and secured with connectors, there is no need to understand special unlocking methods for the automatic locking mechanism, and the operator does not require any additional knowledge when assembling bed 1.

[0056] Furthermore, as mentioned above, the operator can easily disassemble the bed 1, and the loss of components such as connectors can be prevented. Moreover, even when stored in the disassembled state, the loss of components such as connectors can be prevented. Furthermore, by engaging the roller 16F (corresponding to the first engagement portion on the first component) provided on the base frame 10 and the shaft retaining portion 34 (corresponding to the second engagement portion on the second component) provided on the center frame 30, the base frame 10 and the center frame 30 are combined in a predetermined relative position. Therefore, the roller connecting hole 16e (first connecting hole) and the front connecting hole 31a (second connecting hole) can be easily and substantially concentrically arranged.

[0057] It is worth noting that this application is not limited to the embodiments described above. Those skilled in the art can make various additions and modifications within the scope of this application.

[0058] In the above embodiment, the base frame 10, the center frame 30, and the head frame 20 are connected by a first knob bolt 50 to prevent them from separating from their preset relative positions. Furthermore, the base frame 10, the center frame 30, and the foot frame 40 can be connected by a second knob bolt 51 to prevent them from separating from their preset relative positions. That is, a guide member 33 is provided on the inner side of the front portion of each second front and rear rod 31 of the center frame 30, and a shaft retaining portion 34 is provided on the inner side of its rear portion. The roller 16F at the front end of each second link 15B slidably engages with the guide member 33 provided at the front portion of each second front and rear rod 31 in the front-rear direction, and the guided portion 17 at the rear end of each first link 15A is held by the shaft retaining portion 34 provided at the rear portion of each second front and rear rod 31. A connecting hole is provided in the guided part 17. The second knob bolt 51 is inserted from the outside into the foot connecting hole 41a, the rear connecting hole 31b, and the connecting hole of the guided part 17, so that the external thread of the second knob bolt 51 engages with the internal thread of the guided part 17. As described above, the base frame 10, the center frame 30, and the foot frame 40 are connected by the second knob bolt 51 to prevent them from separating from their preset relative positions. In this case, the connecting hole of the guided part 17 is equivalent to the first connecting hole, the rear connecting hole 31b is equivalent to the second connecting hole, and the foot connecting hole 41a is equivalent to the third connecting hole.

[0059] In assembling the bed 1, the head frame 20 is first assembled to the center frame 30, and then the foot frame 40 is assembled to the center frame 30. However, it is also possible to assemble the foot frame 40 to the center frame 30 first, and then assemble the head frame 20 to the center frame 30. In this case, when the foot frame 40 is connected to the center frame 30, the rear end of the foot frame 40 may sink due to its weight, while the front end of the center frame 30 may rise. At this time, the main body 34A of the shaft retainer 34 separates from the roller 16F, but because the anti-detachment part 34B located under the main body 34A abuts against the roller 16F, the shaft retainer 34 is prevented from completely separating from the roller 16F, thereby preventing the front end of the center frame from detaching from the base frame.

[0060] Furthermore, in this embodiment, the shaft (specifically the roller 16F) (first joint) provided on the base frame 10 side is engaged with the shaft holding part (second joint) provided on the center frame 30 side. However, it is also possible that the shaft provided on the center frame 30 side is engaged with the shaft holding part provided on the base frame 10.

[0061] For example, in the above embodiments, the first joint and the second joint are described as a shaft and a shaft retaining part, but of course, they are not limited to this and can be described as other jointing devices.

Claims

1. A bed which is disassembled into a plurality of components and assembled by combining and connecting the plurality of components in a predetermined mutual position; the plurality of components include a first component having a first connection hole, a second component having a second connection hole, a third component having a third connection hole, and a connector; when the first component, the second component, and the third component are combined in the predetermined mutual position, the first connection hole, the second connection hole, and the third connection hole communicate with each other; the first component, the second component, and the third component are connected to each other by inserting the connector into the first connection hole, the second connection hole, and the third connection hole, so as to be prevented from being separated from the predetermined mutual position.

2. The bed of claim 1, wherein, the first component and the second component are combined in the predetermined mutual position by engaging a first engagement part provided in the first component with a second engagement part provided in the second component.

3. The bed of claim 2, wherein, the first component is a base frame for lifting the bed, the second component is a center frame supported by the base frame, and the third component is at least one of a head frame and a foot frame connected to the center frame.

4. The bed of claim 3, wherein, the first engagement part is a rotation shaft part provided on the base frame, the first engagement part abuts against the center frame to lift the bed, and the first connection hole penetrates the rotation shaft part; and the second engagement part is a shaft holding part for accommodating and holding the rotation shaft part.

5. The bed of claim 4, wherein, the shaft holding part has an arcuate main body part capable of accommodating the rotation shaft part.

6. The bed of any one of claims 3 to 5, wherein, the center frame includes a protrusion and a loading plate; the head frame or the foot frame includes a locking part; in a state where the head frame or the foot frame is placed on the loading plate, the center frame is combined with the head frame or the foot frame in the predetermined mutual position by being locked to the protrusion by the locking part.

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