JP7578222B2 - Electric bed - Google Patents

Description

The present invention relates to an electric bed in which the bottom angle can be changed using an actuator.

Conventionally, there are known electric beds that can raise the back or legs by changing the angle of the bottom (head bottom, back bottom, leg bottom, etc.) that supports the user's body using the driving force of an actuator (see, for example, Patent Document 1 and Patent Document 2).

Patent No. 2937261 JP 2020-36990 A

In the electric bed described in the above patent document, the connection structure between the bottom parts was complex and large-scale. Therefore, when trying to change the rotation range or rotation angle of the bottom part depending on the height or physique of the user, the work of replacing the bottom part and so on was cumbersome.

The object of the present invention is to provide an electric bed that allows the rotation range and rotation angle of the bottom to be changed with a simple configuration.

The electric bed of the present invention is an electric bed comprising a first bottom, a second bottom rotatably connected to the first bottom, and an actuator for changing the angle of the second bottom relative to the first bottom, wherein the first bottom comprises a support frame, and the second bottom comprises a supported frame connected to the support frame and a bracket connected to the actuator, and by changing the rotation fulcrum of the supported frame on the support frame, the rotation range of the second bottom relative to the first bottom by the actuator can be changed, and the bed is also provided with an operation unit for receiving operation instructions from a user, and a control unit for controlling the operation of the actuator in accordance with the operation instructions received by the operation unit, wherein the operation unit comprises an angle display unit for displaying the relative angle of the second bottom relative to the first bottom, and the angle display unit is capable of changing the display angle in accordance with the change in the rotation fulcrum of the supported frame on the support frame.

According to this configuration, the rotation range of the second bottom can be changed simply by changing the rotation fulcrum of the supported frame in the supporting frame, so that the rotation range and rotation angle of the second bottom can be changed with a simple configuration . Also, the angle display on the operation unit can be changed according to the change in the rotation angle of the second bottom.

The supporting frame has a first supporting hole and a second supporting hole, and the supported frame has a first supported hole and a second supported hole, and they are arranged so that when the relative angle between the first bottom and the second bottom is 180 degrees, the first supporting hole and the first supported hole coincide, and the second supporting hole and the second supported hole coincide, and it is preferable to change the pivot point of the supported frame in the supporting frame by changing whether to insert a fulcrum pin into the first supporting hole and the first supported hole to use it as the pivot point, or to insert the fulcrum pin into the second supporting hole and the second supported hole to use it as the pivot point.

With this configuration, the rotation fulcrum of the supported frame in the supporting frame can be changed simply by changing the insertion position of the fulcrum pin, and the rotation range of the second bottom can be changed, making it possible to change the rotation range and rotation angle of the second bottom with a simple configuration.

An electric bed with this configuration makes it possible to change the rotation range and rotation angle of the bottom with a simple structure.

1 is a perspective view showing the configuration of an electric bed according to an embodiment of the present invention; 2 is a perspective view showing the electric bed shown in FIG. 1 with the lifting frame lowered and the bottom, headboard, and footboard removed. FIG. FIG. 2 is a left side view of the electric bed shown in FIG. FIG. 4 is a perspective view showing the connection structure between the head bottom and the back bottom. FIG. 4 is an exploded perspective view showing the connection structure between the head bottom and the back bottom. 1A and 1B are side views showing the lowered and raised states, respectively, when the head bottom and the back bottom are normally connected. 1A and 1B are side views showing the lowered and raised states, respectively, when the head bottom and the back bottom are highly connected. FIG. 2 is a block diagram showing an example of an electrical configuration of the electric bed shown in FIG. 1 . FIG. 2 is an external view showing an example of a hand switch. 6A and 6B are diagrams showing a display setting screen on a display unit of a hand switch.

The following describes an embodiment of the present invention with reference to the drawings. Components with the same reference numerals in each drawing are the same, and their description will be omitted. In this specification, the direction of the electric bed 1 is indicated by the arrows in each drawing. Figure 1 is a perspective view showing the configuration of an electric bed 1 according to one embodiment of the present invention.

As shown in FIG. 1, the electric bed 1 is formed in a generally rectangular shape with the longitudinal direction in the front-to-rear direction in a plan view. The electric bed 1 mainly comprises a base unit 2 placed on the floor, a lift frame 3 connected to the base unit 2 so that it can be raised and lowered, a bottom 4 attached to the upper surface of the lift frame 3, a headboard 51 attached to the front end of the lift frame 3, and a footboard 52 attached to the rear end of the lift frame 3.

The bottom 4 includes a head bottom 41, a back bottom 42, a seat bottom 43, a knee bottom 44, and a leg bottom 45. The head bottom 41 is positioned to support the user's head, the back bottom 42 is positioned to support the user's back, the seat bottom 43 is positioned to support the user's waist, the knee bottom 44 is positioned to support the user's knees, and the leg bottom 45 is positioned to support the user's legs.

In this embodiment, the back bottom 42 is an embodiment of the first bottom according to the present invention, and the head bottom 41 is an embodiment of the second bottom according to the present invention. Note that the first and second bottoms according to the present invention are not limited to the back bottom 42 and the head bottom 41 as described above, and other bottoms can also be applied as the first and second bottoms.

A user of the electric bed 1 uses the electric bed 1 by placing a mattress (not shown) on the top surface of the bottom 4 and lying down on the mattress with the head at the front and the feet at the back.

Figure 2 is a perspective view showing the state in which the lifting frame 3 of the electric bed 1 shown in Figure 1 has been lowered and the bottom 4, headboard 51, and footboard 52 have been removed. The electric bed 1 is equipped with actuators A1, A2, A3, and A4, and a control box C that controls the driving of these actuators. The actuators A1, A2, A3, and A4 are equipped with an extensible rod R (see Figures 6 (b) and 7 (b)) and a drive unit including a motor and gear mechanism for extending and retracting the extensible rod R. The actuator A3 is one embodiment of the actuator according to the present invention.

The base unit 2 is a base that directly or indirectly supports all the components of the electric bed 1, and is formed in a rectangular shape with its longitudinal direction in the front-to-rear direction in a plan view. As shown in Figure 2, the base unit 2 has support frames 21, 21 on the left and right, each of which has an axial direction in the front-to-rear direction.

A leg base 22 that is placed on the floor surface is attached to both the front and rear ends of each of the support frames 21, 21. A support pillar 23 is placed at the front between the support frames 21, 21, and a support pillar 24 is placed at the rear in the left-right direction. This connects the support frames 21, 21, and the support frames 21, 21 and the support pillars 23, 24 form the base unit 2 as a sturdy frame.

In addition, a support pillar 25 that can slide in the front-rear direction is stretched between the support frames 21, 21 in the left-right direction in the region between support pillar 23 and support pillar 24. Rollers (not shown) are attached to both ends of the support pillar 25. The rollers on both ends of the support pillar 25 are guided by guide members provided inside the support frames 21, 21, allowing the support pillar 25 to slide in the front-rear direction.

The lifting frame 3 is roughly a rectangular frame body with a longitudinal direction in a front-to-rear direction in a plan view. The lifting frame 3 is connected to the base unit 2 so that it can be raised and lowered by a pair of left and right X-shaped link mechanisms 6. The X-shaped link mechanism 6 is configured by links 61 and 62 of the same length that are connected to each other so that they can rotate around an axis 63 that extends left and right at approximately the center.

The lower ends of the pair of links 61 are connected to the support column 23 so as to be swingable around an axis extending in the left-right direction. Rollers (not shown) are attached to the upper ends of the pair of links 61. The rollers of the pair of links 61 are guided by guide members 31, 31 attached to the lifting frame 3, so that the upper ends of the pair of links 61 are connected to the lifting frame 3 so as to be slidable in the front-rear direction.

The lower ends of the pair of links 62 are connected to the support columns 25. The upper ends of the pair of links 62 are connected to the lifting frame 3 so as to be swingable about an axis extending in the left-right direction. A connecting rod 64 is suspended between the pair of links 61 at a position above the axis 63.

A connecting rod 27 is stretched between the support frames 21, 21. The actuator A1 is swingably connected to the approximate center of the connecting rod 27. A bracket 65 extending in the radial direction is attached to the approximate center of the connecting rod 64. The tip of the telescopic rod R of the actuator A1 is swingably connected to the tip of the bracket 65 around an axis extending in the left-right direction.

As a result, when the telescopic rod R of the actuator A1 extends, the X-shaped link mechanism 6 extends in the vertical direction and the lifting frame 3 rises, and when the telescopic rod R of the actuator A1 contracts, the X-shaped link mechanism 6 contracts in the vertical direction and the lifting frame 3 descends.

Connected to the lifting frame 3 are a head frame 411 constituting the head bottom 41, a back frame 421 constituting the back bottom 42, a knee frame 441 constituting the knee bottom 44, and a leg frame 451 supporting the leg bottom 45. Between the back bottom 42 and the knee bottom 44, a seat bottom 43 is fixedly attached to the lifting frame 3.

The back frame 421 is connected to the lift frame 3 so as to be swingable about an axis extending in the left-right direction with its rear end as a fulcrum. The drive unit of the actuator A2 is connected to the lift frame 3 so as to be swingable about an axis extending in the left-right direction. The tip of the telescopic rod R of the actuator A2 is connected to the back frame 421 via a link mechanism (not shown).

As a result, when the telescopic rod R of actuator A2 extends, the back frame 421 rotates to stand up and changes its position upward, and the head frame 411 and actuator A3 move upward in conjunction with the change in position of the back frame 421. When the telescopic rod R of actuator A2 contracts, the back frame 421 rotates to fall down and changes its position downward, and the head frame 411 and actuator A3 move downward in conjunction with the change in position of the back frame 421.

As shown in Figures 4 and 5, the front end of the back frame 421 and the rear end of the head frame 411 are connected to be swingable around an axis extending in the left-right direction. Specifically, the front end of the back frame 421 is provided with support frames 422/422 extending forward, and the rear end of the head frame 411 is provided with supported frames 412/412 extending rearward and a bracket 413. The rear end of the bracket 413 is connected to the tip of the telescopic rod R of the actuator A3. The support frames 422/422 and the supported frames 412/412 are connected to be rotatable by a fulcrum pin P.

The back bottom 42 is attached to the back frame 421, and the head bottom 41 is attached to the head frame 411. When the telescopic rod R of the actuator A2 extends, the head bottom 41 and the back bottom 42 rise upward in unison, and when the telescopic rod R of the actuator A2 contracts, the head bottom 41 and the back bottom 42 fall downward in unison.

When the back bottom 42 changes its position downward and becomes horizontal, the front end of the back frame 421 or a link mechanism, etc. interferes with the lifting frame 3, and the back bottom 42 cannot change its position further downward. The position of the back bottom 42 at this time is the lower limit of the movable range of the position of the back bottom 42. At this time, the load of the back bottom 42 and head bottom 41 is received by the lifting frame 3. The lifting frame 3 corresponds to an example of a support member for the back bottom 42.

When the telescopic rod R of the actuator A3 extends, the head frame 411 changes its position upward, and the head bottom 41 rises. When the telescopic rod R of the actuator A3 contracts, the head frame 411 changes its position downward, and the head bottom 41 approaches flatness relative to the back bottom 42. In other words, the actuator A3 changes the angle of the head bottom 41 relative to the back bottom 42 by its drive.

The movable range of the support frames 422/422 and the supported frames 412/412 is limited to the position where the head frame 411 and back frame 421 are flat, i.e., the flat position where the head bottom 41 and back bottom 42 are flat. The support frames 422/422 and the supported frames 412/412 bend in a direction where the bottom angle formed by the head bottom 41 and back bottom 42 on the upper side becomes smaller than in the flat position, but the support frames 422/422 and the supported frames 412/412 are locked so that they do not bend in a direction where the bottom angle becomes larger than in the flat position.

When the head bottom 41 and back bottom 42 are in a flat position and the support frames 422/422 and the supported frames 412/412 are locked, the position of the head bottom 41 at this time becomes the lower limit of the movable range of the position of the head bottom 41. At this time, the load of the head bottom 41 is received by the support frames 422/422 and the supported frames 412/412.

The knee frame 441 is connected to the lifting frame 3 so as to be swingable around an axis extending in the left-right direction with its front end as a fulcrum. The rear end of the knee frame 441 is connected to the front end of the leg frame 451 by a hinge so as to be swingable around an axis extending in the left-right direction. The drive unit of the actuator A4 is connected to the lifting frame 3 so as to be swingable around an axis extending in the left-right direction. The tip of the telescopic rod R of the actuator A4 is connected to the knee frame 441 via a link mechanism (not shown).

As a result, when the telescopic rod R of actuator A4 extends, the knee frame 441 rotates to stand up and changes its position upward, and the front end of the leg frame 451 rises in conjunction with the change in position of the knee frame 441. On the other hand, when the telescopic rod R of actuator A4 contracts, the knee frame 441 rotates to approach horizontal and changes its position downward, and the front end of the leg frame 451 descends in conjunction with the change in position of the knee frame 441.

The knee bottom 44 is attached to the knee frame 441, and the leg bottom 45 is attached to the leg frame 451. When the telescopic rod R of the actuator A4 extends, the knee bottom 44 and the leg bottom 45 rise up in a mountain shape with the hinge at the top, and when the telescopic rod R of the actuator A4 contracts, the hinge descends and the knee bottom 44 and the leg bottom 45 approach horizontal.

When the hinge descends and the knee bottom 44 and leg bottom 45 change position downward to become horizontal, the rear end of the knee frame 441, the front end of the leg frame 451, or the hinge interferes with the lifting frame 3, and the knee bottom 44 and leg bottom 45 cannot change position downward any further. The position of the knee bottom 44 and leg bottom 45 at this time is the lower limit of the movable range of the position of the knee bottom 44 and leg bottom 45. At this time, the load of the knee bottom 44 and leg bottom 45 is received by the lifting frame 3. The lifting frame 3 corresponds to an example of a support member for the knee bottom 44 and leg bottom 45.

Hereinafter, the operation of raising the bottom 4 by the actuator A1 and the operation of changing the position of the head bottom 41, back bottom 42, knee bottom 44, and leg bottom 45 upward by the actuators A2, A3, and A4 will be collectively referred to as the upward operation, and the operation of lowering the bottom 4 by the actuator A1 and the operation of changing the position of the head bottom 41, back bottom 42, knee bottom 44, and leg bottom 45 downward by the actuators A2, A3, and A4 will be collectively referred to as the downward operation.

Figure 8 is a block diagram showing an example of the electrical configuration of the electric bed 1 shown in Figure 1. As shown in Figure 8, the electric bed 1 includes actuators A1, A2, A3, and A4, control modules A1C, A2C, A3C, and A4C, a hand switch 8, and a control unit 7. Hereinafter, the actuators A1, A2, A3, and A4 will be collectively referred to as actuator A, and the control modules A1C, A2C, A3C, and A4C will be collectively referred to as control module AC.

Actuators A1, A2, A3, and A4 are connected to the control unit 7 via control modules A1C, A2C, A3C, and A4C. Control module AC expands and contracts actuator A in response to a control signal from the control unit 7.

The telescopic rod R of the actuator A is, for example, a spline shaft. The gear mechanism (not shown) of the actuator A rotates the telescopic rod R about its axis using the rotational driving force of the motor, thereby telescopically extending the telescopic rod R.

Figure 9 is an external view showing an example of the hand switch 8. The hand switch 8 includes a head-lowering button 81D, a head-raising button 81U, a back-lowering button 82D, a back-raising button 82U, a legs-lowering button 83D, a legs-raising button 83U, a height-lowering button 84D, a height-raising button 84U, a power switch 86, and a display unit 87.

The display unit 87 is, for example, a liquid crystal display, and displays the height and posture of each bottom 4. As shown in FIG. 9, the display unit 87 includes a head angle display unit 87a that displays the relative angle of the head bottom 41 to the back bottom 42, a back angle display unit 87b that displays the relative angle of the back bottom 42 to the seat bottom 43, a foot angle display unit 87c that displays the relative angle of the knee bottom 44 to the seat bottom 43, and a height display unit 87d that displays the height of each bottom 4 due to the elevation of the lifting frame 3. The head angle display unit 87a is one embodiment of the angle display unit according to the present invention. The hand switch 8 is an operation unit that accepts operation instructions from the user. The hand switch 8 outputs a signal indicating the accepted instruction to the control unit 7.

The head-lowering button 81D and the head-raising button 81U accept operation instructions for downward and upward movements (driving actuator A3) for the head bottom 41, respectively. The back-lowering button 82D and the back-raising button 82U accept operation instructions for downward and upward movements (driving actuator A2) for the back bottom 42, respectively. The foot-lowering button 83D and the foot-raising button 83U accept operation instructions for downward and upward movements (driving actuator A4) for the knee bottom 44, respectively. The height-lowering button 84D and the height-raising button 84U accept operation instructions for downward and upward movements (driving actuator A1) for the entire bottom 4.

The control unit 7 is housed in the control box C. The control unit 7 is configured with, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a RAM (Random Access Memory) that temporarily stores data, a non-volatile storage unit that stores predetermined control programs, and peripheral circuits thereof. The control unit 7 controls the operation of the actuator A in response to an operation instruction received by the hand switch 8. The control unit 7 also controls the display operation of the display unit 87 of the hand switch 8.

In the electric bed 1 according to this embodiment, the rotation range of the head bottom 41, which is the second bottom, can be changed relative to the back bottom 42, which is the first bottom. Specifically, the rotation range of the head bottom 41 relative to the back bottom 42 can be changed by changing the rotation fulcrum of the supported frames 412, 412 of the head bottom 41 on the support frames 422, 422 of the back bottom 42.

In detail, as shown in Fig. 5 to Fig. 7, the support frame 422 has a first support hole 422a at the tip (front end) and a second support hole 422b at the base end, and the supported frame 412 has a first supported hole 412a at the base end and a second supported hole 412b at the tip (rear end). When the relative angle between the back bottom 42 and the head bottom 41 is 180 degrees, that is, in a flat position where the head bottom 41 and the back bottom 42 are flat, the first support hole 422a and the first supported hole 412a coincide with each other, and the second support hole 422b and the second supported hole 412b coincide with each other.

The electric bed 1 can be changed to insert the fulcrum pin P into the first support hole 422a and the first supported hole 412a to serve as a rotation fulcrum, or insert the fulcrum pin P into the second support hole 422b and the second supported hole 412b to serve as a rotation fulcrum. This allows the rotation fulcrum of the supported frames 412, 412 in the support frames 422, 422 to be changed, and the rotation range of the head bottom 41 relative to the back bottom 42 to be changed.

Specifically, as shown in Fig. 5 and Fig. 6(a), when the fulcrum pin P is inserted into the first supporting hole 422a and the first supported hole 412a to serve as a pivot fulcrum, the pivot fulcrum is located near the head bottom 41. In this case, when the actuator A3 is driven to extend the telescopic rod R, the head bottom 41 rises forward of the pivot fulcrum close to the head bottom 41, as shown in Fig. 6(b).

On the other hand, as shown in FIG. 7(a), when the fulcrum pin P is inserted into the second support hole 422b and the second supported hole 412b to serve as a pivot fulcrum, the pivot fulcrum is located near the back bottom 42. In this case, when the actuator A3 is driven to extend the telescopic rod R, the head bottom 41 rises forward of the pivot fulcrum close to the back bottom 42, as shown in FIG. 7(b).

As described above, with the electric bed 1 according to this embodiment, the rotation fulcrum of the supported frame 412 on the support frame 422 can be changed simply by changing the insertion position of the fulcrum pin P. In other words, it is possible to change the rotation range (length from the rotation fulcrum) of the head bottom 41 with a simple configuration according to the height and build of the user.

For example, if the user is relatively small in stature, the rotation range of the head bottom 41 can be reduced by inserting the fulcrum pin P into the first support hole 422a and the first supported hole 412a to serve as a rotation fulcrum. Conversely, if the user is relatively large in stature, the rotation range of the head bottom 41 can be increased by inserting the fulcrum pin P into the second support hole 422b and the second supported hole 412b to serve as a rotation fulcrum.

Also, as shown in Fig. 6(b) and Fig. 7(b), when the rotation range of the head bottom 41 is different, the rotation angle of the head bottom 41 is changed when the extension length of the telescopic rod R from the actuator A3 is the same. That is, as shown in Fig. 6(a), when the fulcrum pin P is inserted into the first support hole 422a and the first supported hole 412a to serve as the rotation fulcrum, the distance between the telescopic rod R, which is the force point, and the rotation fulcrum becomes longer, so the rotation angle of the head bottom 41 becomes smaller. On the other hand, as shown in Fig. 7(a), when the fulcrum pin P is inserted into the second support hole 422b and the second supported hole 412b to serve as the rotation fulcrum, the distance between the telescopic rod R, which is the force point, and the rotation fulcrum becomes shorter, so the rotation angle of the head bottom 41 becomes larger.

In this way, with the electric bed 1 according to this embodiment, the rotation fulcrum of the supported frame 412 in the support frame 422 can be changed simply by changing the insertion position of the fulcrum pin P, and the rotation angle of the head bottom 41 can be changed with a simple configuration when the extension length of the telescopic rod R from the actuator A3 is the same.

In addition, in the electric bed 1 according to this embodiment, the display unit 87 in the hand switch 8 includes a head angle display unit 87a as an angle display unit that displays the relative angle of the head bottom 41 with respect to the back bottom 42. The head angle display unit 87a can change the display angle in accordance with a change in the rotation fulcrum of the supported frame 412 in the support frame 422.

Specifically, as shown in Figures 10(a) and (b), the user of the electric bed 1 operates the hand switch 8 to display a "headrest angle display setting screen" on the display unit 87. Here, "headrest angle" refers to the relative angle of the head bottom 41 with respect to the back bottom 42.

When the fulcrum pin P is inserted into the first supporting hole 422a and the first supported hole 412a to serve as a rotation fulcrum, the user of the electric bed 1 selects the normal display setting section 87e on the headrest angle display setting screen, as shown in the shaded area in FIG. 10(a). As a result, the angle displayed on the head angle display section 87a is controlled by the control section 7 and displayed in the range of 0 degrees to 30 degrees according to the extension length of the telescopic rod R from the actuator A3.

On the other hand, when the fulcrum pin P is inserted into the second support hole 422b and the second supported hole 412b to serve as a rotation fulcrum, the user of the electric bed 1 selects the high angle display setting section 87f on the headrest angle display setting screen, as shown in the shaded area in Figure 10(b). As a result, the angle displayed on the head angle display section 87a is controlled by the control section 7 and displayed in the range of 0 degrees to 50 degrees according to the extension length of the telescopic rod R from the actuator A3.

As described above, according to the electric bed 1 of this embodiment, the angle display on the hand switch 8, which is the operating unit, can be changed in response to a change in the relative angle of the head bottom 41 with respect to the back bottom 42. In other words, even if the rotation angle of the head bottom 41 with respect to the back bottom 42 is changed, the actual rotation angle can be displayed on the hand switch 8.

1 Electric bed 2 Base unit
3 Lifting frame 4 Bottom
6 X-shaped link mechanism 7 Control section
8. Hand switch (operation part)
21 Support frame 22 Leg base
23 Support pillar 24 Support pillar
25 Support column 27 Connecting rod
31, 31 Guide member
41 Head bottom (second bottom)
42 Back bottom (first bottom)
43 Seat bottom 44 Knee bottom
45 Leg bottom
51 Headboard 52 Footboard
61, 62 Link 63 Axis
64 Connecting rod 65 Bracket
81D Head down button 81U Head up button
82D Back lowering button 82U Back raising button
83D Foot down button 83U Foot up button
84D Height lowering button 84U Height raising button
86 Power switch 87 Display unit
87a Head angle display section 87b Back angle display section
87c Foot angle display section 87d Height display section
87e Normal display setting section 87f High angle display setting section
411 Head frame 412 Supported frame
412a First supported hole 412b Second supported hole
413 Bracket 421 Back frame
422 Support frame 422a First support hole
422b Second support hole 441 Knee frame
451 Leg frame
A1, A2, A3, A4 Actuator AC, A1C, A2C, A3C, A4C Control module C Control box R Telescopic rod
P fulcrum pin

Claims (2)

The first bottom,
a second bottom pivotably connected to the first bottom;
An actuator for changing an angle of the second bottom relative to the first bottom,
the first bottom comprises a support frame;
The second bottom includes a supported frame coupled to the supporting frame and a bracket connected to the actuator,
By changing the pivot point of the supported frame in the supporting frame, the range of rotation of the second bottom relative to the first bottom by the actuator can be changed ;
an operation unit that receives operation instructions from a user;
a control unit that controls an operation of the actuator in response to an operation instruction received by the operation unit,
the operation unit includes an angle display unit that displays a relative angle of the second bottom with respect to the first bottom,
An electric bed, wherein the angle display unit is capable of changing the display angle in accordance with a change in the rotation fulcrum of the supported frame in the supporting frame. The support frame has a first support hole and a second support hole,
The supported frame has a first supported hole and a second supported hole,
When the relative angle between the first bottom and the second bottom is 180 degrees, the first supporting hole and the first supported hole are aligned, and the second supporting hole and the second supported hole are aligned,
An electric bed as described in claim 1, in which the rotation fulcrum of the supported frame in the supporting frame is changed by changing whether the fulcrum pin is inserted into the first support hole and the first supported hole to serve as the rotation fulcrum, or the fulcrum pin is inserted into the second support hole and the second supported hole to serve as the rotation fulcrum.

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