Bed

Abstract

To provide a bed achieving cost reduction and being easily assembled and disassembled.SOLUTION: A bed includes a plurality of components, a base frame 10 with a roller connection hole 16e formed therein, a center frame 30 with a front connection hole 31a formed therein, a head frame 20 with a head connection hole 21a formed therein, and a first knob bolt. The bed is so configured that when the base frame, the center frame and the head frame are combined at prescribed mutual positions, the roller connection hole, the front connection hole and the head connection hole communicate with each other. When the first knob bolt is inserted into the roller connection hole, the front connection hole and the head connection hole, the base frame, the center frame and the head frame are connected so as not to be separated from the prescribed mutual positions.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Many beds are designed to be disassembled and assembled for the convenience of transportation, storage, and loading and unloading into and from houses and buildings. In particular, nursing beds used in nursing care sites are structurally complex, expensive, and have a short period of use compared to normal beds, and are therefore often rented to end users. Rental companies of nursing beds usually frequently disassemble and assemble nursing beds. In conventional nursing beds, a large number of fasteners, such as connecting pins or fastening bolts, are used to connect and fasten parts to each other, which are prepared separately from the parts to be interconnected.

[0003] For example, when assembling a bed, a pin and a split pin that prevents the pin from falling out are used as separate parts to connect the base frame and the center frame.

[0004] Patent document 1 also discloses a configuration in which an automatic locking mechanism composed of a locking member and a coil spring, etc. is provided on the center frame, and when the base frame and center frame are connected, the automatic locking mechanism automatically locks the center frame to the base frame. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2022-013893 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, using a fastener as a separate part from the connected parts such as the frame is costly, and a case is required to store the separate part, which adds to the cost. In addition, the presence of the fastener as a separate part increases the number of steps in the assembly work, which increases the assembly time. Furthermore, there is a risk that the fastener will be lost as a separate part.

[0007] Also, by providing an automatic locking mechanism, as in the bed of Patent Document 1, the number of parts required to configure this mechanism increases, which increases costs, and the mechanism becomes more complicated, which may lead to unexpected mechanical malfunctions. Furthermore, the automatic locking mechanism requires a different bed assembly method than before, so workers will need new knowledge, etc., when assembling the bed.

[0008] SUMMARY OF THE PRESENT EMBODIMENT It is therefore an object of the present invention to provide a bed which can be easily assembled and disassembled at reduced cost. [Means for solving the problem]

[0009] A bed according to one embodiment can be disassembled into multiple parts and completed by assembling and connecting the multiple parts at a predetermined relative position, the multiple parts include a first part having a first connecting hole formed therein, a second part having a second connecting hole formed therein, a third part having a third connecting hole formed therein, and a fastener, wherein when the first part, the second part, and the third part are assembled at a predetermined relative position, the first connecting hole, the second connecting hole, and the third connecting hole are configured to communicate with each other, and the fastener is inserted into the first connecting hole, the second connecting hole, and the third connecting hole, thereby connecting the first part, the second part, and the third part so that they do not come off from the predetermined relative position.

[0010] The first component and the second component may be assembled at the predetermined relative position by engaging a first engagement portion provided on the first component with a second engagement portion provided on the second component.

[0011] The first part may be a base frame that raises and lowers the bed, the second part may be a center frame supported by the base frame, and the third part may be at least one of a head frame or a foot frame connected to the center frame.

[0012] The first engagement portion may be a rotating shaft portion provided on the base frame and abuts against the center frame to raise and lower the bed, the first connecting hole may pass through the rotating shaft portion, and the second engagement portion may be a shaft holding portion that accommodates and holds the rotating shaft portion.

[0013] The shaft holder may have an arch-shaped main body capable of accommodating the rotating shaft.

[0014] The center frame may have a protrusion and a mounting plate, and the head frame or the foot frame may have an engagement portion, and the center frame and the head frame or the foot frame may be combined in the specified relative position with the engagement portion engaging with the protrusion and the head frame or the foot frame being placed on the mounting plate. Effect of the Invention

[0015] The present invention provides a bed that can reduce costs and is easy to assemble and disassemble. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic exploded view of a bed according to an embodiment of the present invention. [Diagram 2] 13 is a diagram showing a state in which the base frame, the center frame, and the base frame are connected by a first knob bolt so as not to come off from their predetermined relative positions. FIG. [Diagram 3] FIG. [Figure 4] 13 is a diagram showing a state in which a roller is housed in a main body of a shaft holder. FIG. [Diagram 5]11A to 11C are explanatory diagrams of a process for connecting a head frame to a center frame. [Figure 6] 11A to 11C are explanatory diagrams of a process for connecting a head frame to a center frame. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] FIG. 1 is a schematic exploded view of a bed 1 according to this embodiment. The bed 1 is a nursing bed used, for example, in nursing care facilities. The bed 1 is formed in a generally vertically elongated rectangular shape in a plan view in order to support the body of a recumbent. In this specification, the longitudinal direction of the bed 1 is defined as the front-rear direction, the head side of the bed 1 as the front side, and the foot side as the rear side. The direction perpendicular to the front-rear direction of the bed 1 is defined as the left-right direction.

[0019] The bed 1 mainly comprises a bottom 2 which can be separated and connected to each other, a frame 3, and boards (not shown) which are arranged at the front and rear ends of the bed 1.

[0020] The bottom 2 supports from below a bed mat (not shown) on which a recumbent person lies. The bottom 2 has multiple elements, such as a back bottom 2A, a waist bottom 2B, and a knee-leg bottom 2C. These elements of the bottom 2 are arranged in the order of the back bottom 2A, the waist bottom 2B, and the knee-leg bottom 2C from the front to the rear in the front-rear direction. The angles of the back bottom 2A and the knee-leg bottom 2C relative to the waist bottom 2B are variable. In other words, the bottom 2 is bendable. The bottom 2 may be made of, for example, metal or synthetic resin. The knee-leg bottom 2C may be composed of a knee bottom on which the knees are placed and a leg bottom on which the legs are placed.

[0021] The frame 3 has a vertically long, generally rectangular shape in a plan view, and supports the bottom 2 from below. The frame 3 includes, as a plurality of subframes, for example, a base frame 10 that can be separated and connected to each other, and a head frame 20, a center frame 30, and a foot frame 40 that can be disassembled and connected to each other and that constitute a main frame 4. The frame 3 includes a first knob bolt 50 and a second knob bolt 51 as fasteners. When disassembled for transportation or the like, the bed 1 is disassembled into a plurality of main components, namely, the base frame 10, the head frame 20, the center frame 30, the foot frame 40, the back bottom 2A, the waist bottom 2B, and the knee-leg bottom 2C. When assembling the bed 1, the main components 10 to 40, 2A to 2C are assembled and connected to each other at predetermined positions to complete the bed 1.

[0022] <Base frame 10> The base frame 10 is a frame that serves as the foundation of the bed 1. The base frame 10 has a vertically long, generally rectangular shape in a plan view, and supports the main frame 4 from below. The base frame 10 corresponds to a first component in this embodiment.

[0023] The base frame 10 includes a base 11 that is placed on a floor (installation surface), an X-link mechanism 12 serving as an elevation mechanism (movable mechanism), and an actuator 13.

[0024] The base 11 includes a pair of first front-rear bars 11A extending in the front-rear direction, and a pair of first left-right bars 11B extending in the left-right direction. The pair of first front-rear bars 11A are arranged at a predetermined interval in the left-right direction, and the pair of first left-right bars 11B is installed at their front and rear parts. Fixed legs 14 are attached to the front and rear ends of each of the first front-rear bars 11A. A guide member 11C is provided on the rear inner side of the pair of front-rear bars 11A. The guide member 11C supports a connecting bar 16C of the X-link mechanism 12 relative to the base 11 so that the connecting bar 16C can slide in the front-rear direction.

[0025] The X-link mechanism 12 is connected at its lower part to the base 11 and at its upper part to the center frame 30 (corresponding to the second part in this embodiment). The X-link mechanism 12 mainly includes a pair of first links 15A and second links 15B and a plurality of connecting bars 16A, 16B, and 16C. Each of the first links 15A and each of the second links 15B extend in the front-rear direction, and are connected to each other at approximately the center parts in the front-rear direction by a pin 15C so as to be freely rotatable. That is, the pair of first links 15A and second links 15B are connected to each other in an X-shape in a side view with the pin 15C as the axial center. A pair of the first link 15A and the second link 15B is provided with a gap therebetween in the left-right direction.

[0026] The front ends of the pair of first links 15A are rotatably connected to the first left-right bar 11B on the front side. The rear ends of the pair of first links 15A are connected by a connecting bar 16A. The front ends of the pair of second links 15B are connected by a connecting bar 16B. The rear ends of the pair of second links 15B are connected by a connecting bar 16C. Both ends of the connecting bar 16C are housed in the guide member 11C so as to be slidable in the front-rear direction. This allows the rear ends of the second links 15B to move and rotate in the front-rear direction along the first front-rear bar 11A. A guided portion 17 having a roller is provided on the outer side of the rear ends of the pair of first links 15A.

[0027] FIG. 2 is a diagram showing a state in which the base frame 10, the center frame 30 (corresponding to the second part in this embodiment), and the head frame 20 (corresponding to the third part in this embodiment) are connected by the first knob bolt 50 so as not to come off from their predetermined relative positions. As shown in FIG. 2, a roller support member 16D is provided at both ends in the left-right direction of the connection bar 16B. The roller support member 16D includes a fixed portion 16D1 to which the roller support member 16D is fixed to the inside of the connection bar 16B by welding or the like, and a protruding portion 16D2 protruding outward from the fixed portion 16D1. The outer diameter of the protruding portion 16D2 is smaller than the outer diameter of the fixed portion 16D1. The roller support member 16D is formed with a roller connection hole 16e penetrating in the left-right direction. The protruding portion 16D2 is provided with a roller 16F. The protruding portion 16D2 of the roller support member 16D is inserted into the roller 16F, and the outer end of the roller connecting hole 16e opens outward through a hole in the outer surface of the roller 16F. The roller 16F is rotatable relative to the protruding portion 16D2. The roller 16F corresponds to a rotating shaft portion (first engagement portion), and the roller connecting hole 16e corresponds to a first connecting hole.

[0028] 1 moves the connecting bar 16A up and down. This drives the X-link mechanism 12, causing the first link 15A and the second link 15B to rotate, and the vertical positions of the upper ends of the first link 15A and the second link 15B to vary. As a result, the main frame 4 moves up and down relative to the base 11 of the base frame 10.

[0029] <Mainframe 4> The main frame 4 has a generally vertically elongated rectangular shape in a plan view. The main frame 4 supports the bottom 2 from below. The main frame 4 is connected to the base frame 10, which allows the bottom 2 to move up and down. 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 may be made of, for example, metal or synthetic resin.

[0030] <Center frame 30> The center frame 30 is a frame that supports the waist bottom 2B from below. The head frame 20 is connected to the front of the center frame 30, and the foot frame 40 is connected to the rear of the center frame 30. The center frame 30 is connected to the X-link mechanism 12 of the base frame 10, and is movable up and down.

[0031] The center frame 30 includes a pair of second front-rear bars 31 extending in the front-rear direction, and a pair of second left-right bars 32 extending in the left-right direction. The pair of second front-rear bars 31 are arranged at a predetermined interval in the left-right direction, and the pair of second left-right bars 32 are installed at their central and rear parts. A guide member 33 is provided inside the rear part of each second front-rear bar 31. The guided portion 17 at the rear end of the first link 15A is engaged with the guide member 33 so as to be slidable in the front-rear direction.

[0032] A shaft holding portion 34 (corresponding to the second engagement portion in this embodiment) is provided on the inside of the front portion of each second front-rear bar 31. FIG. 3 is an explanatory diagram of the shaft holding portion 34. As shown in FIG. 3, the shaft holding portion 34 has a main body portion 34A, a retaining portion 34B, and a temporary placement portion 34C. The main body portion 34A is substantially arch-shaped, and can accommodate the roller 16F (FIG. 2) inside. By making the inner diameter of the substantially arch-shaped portion and the outer diameter of the roller 16F substantially the same, the front connecting hole 31a and the roller connecting hole 16e are substantially concentric when accommodated, so that an operation of aligning them for coupling is not required. The retaining portion 34B is connected to the front end of the main body portion 34A. The retaining portion 34B has a lower extending portion 34B1 extending downward from the front end of the main body portion 34A, and an inclined portion 34B2 extending rearward from the lower end of the lower extending portion 34B1. The inclined portion 34B2 is located below the main body portion 34A and is inclined downward (away from the main body portion 34A) toward the rear. The temporary placement portion 34C is connected to the rear end of the main body portion 34A and extends rearward.

[0033] 1, a front connecting hole 31a and a rear connecting hole 31b penetrating in the left-right direction are formed in each of the second front-rear bars 31. The front connecting hole 31a is a hole for connecting the head frame 20 to the center frame 30. The rear connecting hole 31b is a hole for connecting the foot frame 40 to the center frame 30.

[0034] The detailed configuration of the front connecting hole 31a will be described with reference to FIG. 2. As shown in FIG. 2, a through hole 31c penetrating in the left-right direction is formed in the front part of each second front-rear bar 31. A cylindrical first connecting member 35 in which the front connecting hole 31a is formed is provided in the through hole 31c. A female thread is formed on the inner peripheral surface of the first connecting member 35. The front connecting hole 31a opens to the inside of the main body portion 34A of the shaft holding portion 34. The front connecting hole 31a corresponds to a second connecting hole. The rear connecting hole 31b is also formed with a structure similar to that of the front connecting hole 31a.

[0035] 1, each second front-rear bar 31 has a front protrusion 36A and a rear protrusion 36B that protrude outward on its outer surface. The front protrusion 36A is a protrusion for attaching the head frame 20 to the center frame 30. The rear protrusion 36B is a protrusion for attaching the foot frame 40 to the center frame 30. The front protrusion 36A is located forward of the center of the second front-rear bar 31, and the rear protrusion 36B is located rearward of the center of the second front-rear bar 31.

[0036] Each second front-rear bar 31 has a front mounting plate 37A and a rear mounting plate 37B on its lower surface that protrude outward. The front mounting plate 37A is a flat plate for attaching the head frame 20 to the center frame 30. The rear mounting plate 37B is a flat plate for attaching the foot frame 40 to the center frame 30. The front mounting plate 37A is provided in front of the front projection 36A, and the rear mounting plate 37B is provided behind the rear projection 36B.

[0037] <Head Frame 20> The head frame 20 is a frame that supports the back bottom 2A from below. A headboard (not shown) is attached to the front end of the head frame 20. The head frame 20 includes a pair of third front-rear bars 21 extending in the front-rear direction and a pair of third left-right bars 22 extending in the left-right direction. The pair of third front-rear bars 21 are arranged at a predetermined interval in the left-right direction, and the pair of third left-right bars 22 are installed in front and at the center of the pair of third front-rear bars 21. The head frame 20 may include an arm mechanism and an actuator as a raising and lowering mechanism (movable mechanism) for raising and lowering the back bottom 2A.

[0038] A first locking portion 23 (corresponding to a locking portion in this embodiment) is provided at the rear end of each of the third front-rear bars 21. The first locking portion 23 is formed in a concave shape so as to open toward the rear, and receives and locks the front protrusion 36A on the outer surface of each of the second front-rear bars 31.

[0039] Each of the third front-rear bars 21 has a head connecting hole 21a formed therethrough in the left-right direction. The head connecting hole 21a is a hole for connecting the head frame 20 to the center frame 30. The detailed configuration of the head connecting hole 21a will be described with reference to FIG. 2. A through hole 21b is formed in the rear of each of the third front-rear bars 21, penetrating in the left-right direction. A cylindrical second connecting member 24 having the head connecting hole 21a formed therein is provided in the through hole 21b. A part of the second connecting member 24 protrudes to the outside of the third front-rear bar 21. The head connecting hole 21a corresponds to the third connecting hole.

[0040] <Foot frame 40> As shown in Fig. 1, the foot frame 40 is a frame that supports the knee-leg bottom 2C from below. A footboard (not shown) is attached to the rear end of the foot frame 40. The foot frame 40 includes a pair of fourth front-rear bars 41 that extend in the front-rear direction, and a pair of fourth left-right bars 42 that extend in the left-right direction. The pair of fourth front-rear bars 41 are arranged at a predetermined interval in the left-right direction, and the pair of fourth left-right bars 42 are installed at the center and rear of them.

[0041] A second locking portion 43 is provided at the front end of each of the fourth front-rear bars 41. The second locking portion 43 is formed in a concave shape that opens toward the front, and receives and locks the rear projection 36B on the outer surface of each of the second front-rear bars 31. A foot connecting hole 41a that penetrates in the left-right direction is formed in each of the fourth front-rear bars 41. The foot connecting hole 41a is formed with a structure similar to that of the head connecting hole 21a.

[0042] <How to assemble bed 1> Next, a method for assembling the bed 1 according to this embodiment will be described. Fig. 4 is a diagram showing a state in which the roller 16F is housed in the main body portion 34A of the shaft holder 34. Figs. 5 and 6 are explanatory diagrams of a process for connecting the head frame 20 to the center frame 30.

[0043] The worker connects the center frame 30 to the base frame 10. Specifically, the worker accommodates the guided portions 17 at the rear ends of the first links 15A in the guide members 33 of the second front-rear bars 31, and accommodates the rollers 16F at the front ends of the second links 15B in the shaft holders 34 of the second front-rear bars 31, as shown in FIG. 4. At this time, the worker places the temporary placement portions 34C on the rollers 16F and moves the center frame 30 backward to accommodate the rollers 16F in the main body portions 34A. This makes it easier to assemble the center frame 30 to the base frame 10.

[0044] Next, the worker connects the head frame 20 to the center frame 30. As shown in FIG. 5(a), the worker engages the first locking portion 23 of each third front-rear bar 21 with the front projection 36A of each second front-rear bar 31, and as shown in FIG. 5(b), the worker places each third front-rear bar 21 on the front placement plate 37A of each second front-rear bar 31, and overlaps each third front-rear bar 21 and each second front-rear bar 31 in the left-right direction. This allows the base frame 10, the center frame 30, and the head frame 20 to be combined in a predetermined relative position. In this state, as shown in FIG. 2, 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 aligned in a straight line in the left-right direction and communicate with each other. In this way, by engaging the first engagement portion 23 at the tip of the head frame 20 with the front protrusion 36A of the center frame 30 and placing it on the front mounting plate 37A, the connecting holes of the frames can be aligned and the head frame 20 can be easily connected with the first knob bolt 50 without having to support it with one hand.

[0045] Next, as shown in Figs. 2 and 6, the first knob bolt 50 (corresponding to a fastener in this embodiment) is inserted from the outside through the head connecting hole 21a, the front connecting hole 31a, and the roller connecting hole 16e, and the male thread of the first knob bolt 50 is screwed into the female thread of the first connecting member 35. This connects the base frame 10, the center frame 30, and the head frame 20 so that they do not come off from their predetermined relative positions. The tip of the first knob bolt 50 is located in the roller connecting hole 16e, but does not abut on the inner peripheral surface of the roller connecting hole 16e (is spaced from the inner peripheral surface). In this embodiment, as shown in Figs. 5 and 6(a), the first knob bolt 50 is inserted into the head connecting hole 21a in advance, and an E-ring 51A is provided on the inside of the third front-rear bar 21 so that it does not fall off from the head frame even when the screwing is released. That is, the outer diameter of the E-ring 51A is configured to be larger than the inner diameter of the outer end of the second connecting part 24.

[0046] Next, the worker connects the foot frame 40 to the center frame 30. The worker engages the second locking portion 43 of each fourth front-rear bar 41 with the rear projection 36B of each second front-rear bar 31, places each fourth front-rear bar 41 on the rear mounting plate 37B of each second front-rear bar 31, and overlaps each fourth front-rear bar 41 and each second front-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, by engaging the second locking portion 43 at the tip of the foot frame 40 with the rear projection 36B of the center frame 30 and placing it on the rear mounting plate 37B, the positions of the connecting holes of the frames are aligned, and the foot frame 40 can be easily connected with the second knob bolt 51 without supporting it by hand.

[0047] The second knob bolt 51 is inserted from the outside through the foot connecting hole 41a and the rear connecting hole 31b, and the male thread of the second knob bolt 51 is screwed into the female thread of the connecting member that forms the rear connecting hole 31b. This fixes the foot frame 40 to the center frame 30.

[0048] The worker attaches the bottom 2 and a board (not shown) to the assembled frame. In this manner, the frames 10 to 40 are assembled, and the bed 1 is completed.

[0049] As described above, according to the bed 1 of this embodiment, the multiple parts include the base frame 10 (corresponding to the first part in which the first connecting hole is formed) in which the roller connecting hole 16e is formed, the center frame 30 (corresponding to the second part in which the second connecting hole is formed) in which the front connecting hole 31a is formed, the head frame 20 (corresponding to the third part in which the third connecting hole is formed) in which the head connecting hole 21a is formed, and the first knob bolt 50 (corresponding to the fastener). Then, by simply performing the normal assembly work as described above, the base frame 10, the center frame 30, and the head frame 20 can be arranged in a predetermined relative position (the first connecting hole, the second connecting hole, and the third connecting hole are substantially concentric), and are connected so as not to come off from the relative position. In other words, when assembling the frames 10 to 30, the worker can omit a very troublesome work process in which the worker must align each frame and then fix each part with a fastener which is a separate part. Therefore, the worker can easily perform the assembly work of the bed 1, and the assembly time can be shortened.

[0050] Also, in this embodiment, the fasteners, which were separate members in the past, are prevented from falling off the head frame by E-rings or the like, so there is no need for separate fasteners required for assembling the frames 10-30 of the bed 1, and it is possible to prevent loss of fastener parts during the work of assembling the bed 1. Furthermore, there is no need for the fasteners, which are separate members, and a case for storing them, etc., so costs can be reduced.

[0051] In addition, because there is no need to provide an automatic locking function, the number of parts does not increase, and unexpected mechanical problems do not occur due to a complicated mechanism. Furthermore, since bed 1 can be completed by simply performing the usual assembly and disassembly procedures and fastening with fasteners, there is no need to know special unlocking methods such as those for automatic locking, and workers are not required to have new knowledge when assembling bed 1.

[0052] Also, when disassembling the bed 1, the worker can easily perform the work and prevent the loss of parts such as fasteners, as described above. Furthermore, when storing the bed in a disassembled state, the loss of parts such as fasteners can be prevented. Also, by engaging the roller 16F (corresponding to the first engagement part provided on the first part) provided on the base frame 10 with the shaft holding part 34 (corresponding to the second engagement part provided on the second part) provided on the center frame 30, the base frame 10 and the center frame 30 are combined at 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 arranged substantially concentrically.

[0053] The present invention is not limited to the above-described embodiment, and those skilled in the art can make various additions and modifications within the scope of the present invention.

[0054] In the above embodiment, the base frame 10, the center frame 30, and the head frame 20 are connected by the first knob bolt 50 so as not to come off from their respective predetermined positions, but the base frame 10, the center frame 30, and the foot frame 40 may be connected by the second knob bolt 51 so as not to come off from their respective predetermined positions. That is, in each of the second front-rear bars 31 of the center frame 30, a guide member 33 is provided on the inside of its front part, and a shaft holding portion 34 is provided on the inside of its rear part. Then, the roller 16F at the front end of each of the second links 15B is engaged with the guide member 33 provided at the front part of each of the second front-rear bars 31 so as to be slidable in the front-rear direction, and the guided portion 17 at the rear end of each of the first links 15A is held by the shaft holding portion 34 provided at the rear part of each of the second front-rear bars 31. A connecting hole is formed in the guided portion 17, and the second knob bolt 51 is inserted from the outside through the foot connecting hole 41a, the rear connecting hole 31b, and the connecting hole of the guided portion 17, and the male thread of the second knob bolt 51 is screwed into the female thread of the guided portion 17. In this way, the base frame 10, the center frame 30, and the foot frame 40 are connected by the second knob bolt 51 so that they do not move away from their predetermined relative positions. In this case, the connecting hole of the guided portion 17 corresponds to the first connecting hole, the rear connecting hole 31b corresponds to the second connecting hole, and the foot connecting hole 41a corresponds to the third connecting hole.

[0055] In assembling the bed 1, the foot frame 40 is connected to the center frame 30 after the head frame 20 is assembled to the center frame 30, but the foot frame 40 may be connected to the center frame 30 before the head frame 20 is assembled to the center frame 30. In this case, when the foot frame 40 is connected to the center frame 30, the rear end side of the foot frame 40 may lower and the front end side of the center frame 30 may rise due to the weight of the foot frame 40. At this time, the main body 34A of the shaft holding part 34 separates from the roller 16F, but the stopper part 34B located on the lower side of the main body 34A hits the roller 16F, so that the shaft holding part 34 is completely removed from the roller 16F and the front end side of the center frame is prevented from coming off the base frame.

[0056] In addition, the shaft (specifically, the roller 16F) (first engagement portion) on the base frame 10 side and the shaft holding portion (second engagement portion) on the center frame 30 side are engaged with each other, but the shaft on the center frame 30 side may be configured to be engaged with the shaft holding portion of the base frame 10.

[0057] For example, in the above embodiment, the first engagement portion and the second engagement portion are described as a shaft and a shaft holder, but it is of course not limited to this and other engagement means may be used. [Explanation of symbols]

[0058] 1: bed, 2: bottom, 2A: back bottom, 2B: waist bottom, 2C: knee leg bottom, 3: bottom, 4: main frame, 10: base frame, 11: base, 11A: first front and rear bar, 11B: first left and right bar, 11C: guide member, 12: X-link mechanism, 13: actuator, 14: fixed leg, 15A: first link, 15B: second link, 15C: pin, 16A, 16B, 16C: connecting bar, 16D: roller support member, 16D: fixed part, 16D: protruding part, 16e: roller connecting hole, 16F: roller, 17: guided part, 20: head frame, 21: third front and rear bar, 21a: head connecting hole, 21 b: through hole, 22: third left and right bar, 23: first locking portion, 24: second connecting member, 30: center frame, 31: second front and rear bar, 31a: front connecting hole, 31b: rear connecting hole, 31c: through hole, 32: second left and right bar, 33: guide member, 34: shaft holding portion, 34A: main body portion, 34B: lower extension portion, 34B: inclined portion, 34B: removal prevention portion, 34C: temporary placement portion, 35: first connecting member, 36A: front protrusion, 36B: rear protrusion, 37A: front placement plate, 37B: rear placement plate, 40: foot frame, 41: fourth front and rear bar, 41a: foot connecting hole, 42: fourth left and right bar, 43: second locking portion, 50: first knob bolt, 51: second knob bolt

Claims

1. A bed that can be disassembled into a plurality of parts and is completed by combining and connecting the plurality of parts in a predetermined relative position, The plurality of components include a first component having a first connecting hole formed therein, a second component having a second connecting hole formed therein, a third component having a third connecting hole formed therein, and a fastener; When the first part, the second part, and the third part are assembled in a predetermined relative position, the first connecting hole, the second connecting hole, and the third connecting hole are configured to communicate with each other, The fastener is inserted into the first connecting hole, the second connecting hole, and the third connecting hole, so that the first part, the second part, and the third part are connected to each other so as not to come off from the predetermined relative positions. bed.

2. a first engaging portion provided on the first part and a second engaging portion provided on the second part are engaged with each other, so that the first part and the second part are assembled at the predetermined relative position; 2. The bed of claim 1.

3. The first component is a base frame that raises and lowers 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 that are connected to the center frame.

3. A bed as claimed in claim 2.

4. The first engagement portion is a rotating shaft portion that abuts against the center frame to raise and lower the bed and is provided on the base frame, and the first connection hole passes through the rotating shaft portion. The second engagement portion is a shaft holding portion that houses and holds the rotating shaft portion.

4. A bed as claimed in claim 3.

5. The shaft holder has an arch-shaped main body capable of accommodating the rotating shaft.

5. A bed as claimed in claim 4.

6. The center frame has a protrusion and a mounting plate, The head frame or the foot frame has a locking portion, The center frame and the head frame or the foot frame are combined at the predetermined relative position with the locking portion locked to the protrusion and the head frame or the foot frame placed on the mounting plate. A bed according to any one of claims 3 to 5.

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