TW202112334A - Bed device - Google Patents

Abstract

This bed device comprises: a bed frame; a back bottom; a waist bottom coupled to the back bottom; a leg bottom which includes a femoral bottom coupled to the waist bottom; and a driving mechanism for deforming the back bottom, the waist bottom, and the leg bottom into at least a recumbent state in which the back bottom is horizontal and a sitting state in which the back bottom is standing and the femoral bottom is positioned at an end section of the bed frame. The driving mechanism can rotate the femoral bottom about one end of the femoral bottom coupled to the waist bottom in the recumbent state and in the sitting state.

Description

Bed device

Invention field

The present invention relates to a bed device that can be deformed from a lying position to a sitting position.

Background of the invention

In the past, there has been known a bed device with auxiliary functions such as a back-lifting function or a knee-lifting function, which allows users such as the elderly or the physically challenged to easily change their postures on the bed device. The bed device has a plurality of bottom plates including a back bottom plate, a waist bottom plate and a foot bottom plate, and the driving mechanism can rotate the bottom plates in response to the operation of an input device such as a remote control.

In addition, there is also proposed a bed device in which each bottom plate can be deformed from a lying state formed in a flat shape to a sitting state (for example, refer to Patent Documents 1 to 3). In the sitting position, as the bottom plates move to the foot side of the bed device, the back bottom plate stands up. In this way, the user can sit on each floor by stepping on the floor on which the bed device is placed. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] The Japanese Fair Gazette No. 4-819 [Patent Document 2] Japanese Patent No. 4231549 [Patent Document 3] Japanese Patent Laid-Open No. 2018-15269

[Summary of the invention] [The problem to be solved by the invention]

The bed device that can be deformed from the lying state to the sitting state is extremely useful in reducing the physical burden of the user or the helper. However, in such a bed device, there is room for improvement regarding the posture of the bottom plate in the sitting state, the mechanism for deforming to the sitting state, and even the operability of the input device for instructing the deformation to the sitting state.

Therefore, the main purpose of the present invention is to improve the convenience of a bed device that can be deformed from a lying position to a sitting position. [Means to solve the problem]

According to an aspect of the present invention, the bed device includes: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; The sole plate of the foot includes the sole plate of the thigh connected to the aforementioned waist sole plate; and The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and a sitting position in which the back board stands up and the thigh board is located at the end of the bed frame status, The driving mechanism may rotate the thigh bottom plate using one end of the thigh bottom plate connected to the waist bottom plate as an axis in each of the lying position and the sitting position state.

According to another aspect of the present invention, the bed device includes: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; The sole plate of the foot includes a first plate and a second plate that at least partially overlap each other; and The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and the back board stands up and the first board and the second board are located at the waist The sitting position under the floor, The aforementioned drive mechanism includes: The first sliding frame supports the back bottom plate and the waist bottom plate, and is installed on the bed frame; The second sliding frame is installed on the aforementioned first sliding frame; The first link rotatably connects the first plate and the second sliding frame to a plurality of rotating shafts; and The second link rotatably connects the second plate and the second sliding frame to a different number of rotating shafts than the first link, When deforming from the lying state to the sitting state, the first sliding frame moves in a first direction relative to the bed frame, and the second sliding frame moves relative to the first sliding frame in a second direction opposite to the first direction. By moving in the direction, the first plate and the second plate are slid relative to each other while each being rotated by the first link and the second link toward the lower side of the waist bottom plate.

According to a further aspect of the present invention, the bed device includes: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; Foot sole plate, including the thigh sole plate connected to the aforementioned waist sole plate; The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and a sitting position in which the back board stands up and the thigh board is located at the end of the bed frame Status; and The input device includes buttons for inputting commands from the aforementioned lying state to the aforementioned sitting state, The aforementioned drive mechanism includes: Horizontal frame, installed on the aforementioned bed frame; and The inclined frame is connected to be rotatable relative to the horizontal frame and supports the back bottom plate and the waist bottom plate, Furthermore, the driving mechanism deforms the back sole plate, the waist sole plate, and the foot sole plate to the sitting position in response to the operation of the button in the lying position, and operates the button again after that to cause the The inclined frame is inclined with respect to the horizontal frame, so that at least the back plate is inclined forward.

According to a further aspect of the present invention, the bed device includes: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; The sole plate of the foot includes the sole plate of the thigh connected to the aforementioned waist sole plate; and The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and a sitting position in which the back board stands up and the thigh board is located at the end of the bed frame status, The aforementioned back plate includes: The central bottom plate is connected with the aforementioned waist bottom plate; A pair of side bottom plates are connected to each other to be rotatable relative to the two sides in the width direction of the aforementioned central bottom plate; and A pair of protruding strips are provided on the respective back surfaces of the pair of side bottom plates and extend along the longitudinal direction intersecting the width direction, The driving mechanism includes a pair of rollers that respectively push the pair of protrusions when deformed from the lying state to the sitting state, thereby causing the pair of side bottom plates to incline with respect to the center bottom plate. [Effects of the invention]

According to the present invention, the convenience of the bed device that can be deformed from the lying state to the sitting state can be further improved.

[Form to implement invention]

The bed device of one embodiment of the present invention will be described with reference to the drawings. Fig. 1 and Fig. 2 are perspective views of the outline of the bed device B of the present embodiment. In the following description, the X direction, the Y direction, and the Z direction are defined as shown in the figure. The X direction is a direction from the head side of the bed device B to the foot side. The Y direction is the width direction of the bed device B. The Z direction is the height direction of the bed device B. The side indicated by the arrow in the Y direction (the left side viewed from the user in the supine position) is sometimes referred to as "left", and the opposite side (the right side viewed from the user in the supine position) is sometimes referred to as "right". In addition, the side indicated by the arrow in the Z direction is sometimes referred to as "up", and the opposite side is sometimes referred to as "down".

The bed device B includes a floor unit 1, a drive mechanism 2, a bed frame 3, a bottom frame 4, an input device 5, and a control device 6 (refer to FIG. 2). On the upper surface of the floor unit 1, a mattress, etc., not shown, is placed.

In this embodiment, the bottom plate unit 1 includes a back bottom plate 10 that supports the user's back; a waist bottom plate 11 that supports the user's waist; and a foot bottom plate 12 that supports the user's feet.

The back bottom plate 10 includes a center bottom plate 10C and a pair of side bottom plates 10L, 10R. The side bottom plates 10L and 10R are connected to the left and right sides of the width direction (Y direction) of the center bottom plate 10C so as to be able to rotate around an axis parallel to the longitudinal direction of the center bottom plate 10C (direction orthogonal to the Y direction). (Refer to Figure 17).

The waist bottom plate 11 includes a first waist bottom plate 13 and a second waist bottom plate 14. In addition, the foot sole plate 12 includes: a thigh sole plate 15 to support the thigh of the user; a knee sole plate 16 to support the knee or calf of the user; and a first plate 17 and a second plate 18 to support The user's foot.

The center sole plate 10C and the first waist sole plate 13, the first waist sole plate 13 and the second waist sole plate 14, the second waist sole plate 14 and the thigh sole plate 15, the thigh sole plate 15 and the knee sole plate 16, the knee sole plate 16 and the first The plate 17 is connected so as to be rotatable around an axis parallel to the Y direction. The second plate 18 is slidable with respect to the first plate 17. The first plate 17 and the second plate 18 overlap at least partially.

In Fig. 1, the back base 10, the waist base 11 and the foot base 12 are horizontal (parallel to the X-Y plane). On the other hand, in FIG. 2, the back sole plate 10 and the first lumbar sole plate 13 stand up in the Z direction, and the foot sole plate 12 is bent so that the knee sole plate 16 becomes an apex.

The drive mechanism 2 supports the bottom plate unit 1 and deforms the bottom plate unit 1 into various shapes described later. The bed frame 3 is arranged below the floor unit 1. The bottom frame 4 supports the bed frame 3. The bottom frame 4 has legs 4a in contact with the floor surface at four corners of the bed device B. The bottom frame 4 may also have casters instead of the feet 4a.

The input device 5 is, for example, a remote controller, and has a plurality of buttons for inputting the following commands: deformation of the bottom plate unit 1 or lifting of the bed frame 3 relative to the bottom frame 4. The input device 5 includes a sitting position deformation button 5a for inputting the following instructions: the floor unit 1 is transformed from a lying position described later to a sitting state.

The control device 6 is attached to the bed frame 3, for example. The control device 6 controls the driving mechanism 2 in response to instructions input from the input device 5. The input device 5 and the control device 6 are communicatively connected via a wire 5b, for example. However, the input device 5 and the control device 6 can also be connected in a wireless manner.

Fig. 3 is a schematic side view of the bed device B. The driving mechanism 2 has the following elements as elements for supporting the floor unit 1: a fixing pin 35; a back raising frame 41; a pair of knee raising arms 51L, 51R, and a pair of knee raising rollers 52L, one of which are installed at the front ends of these knee raising arms. 52R (refer to FIGS. 18 and 19); a pair of first links 71L, 71R and a pair of second links 72L, 72R (refer to FIGS. 10 and 11).

The fixing pin 35 passes through a pair of holes 14a provided in the second waist bottom plate 14 (refer to FIGS. 1 and 2). The back raising frame 41 supports the back surface of the back bottom plate 10 (center bottom plate 10C). The knee lift rollers 52L and 52R support the back surface of the thigh bottom plate 15. The first links 71L and 71R support the first plate 17 in a rotatable manner. The second link 72L, 72R supports the second plate 18 in a rotatable manner.

The driving mechanism 2 can transform the floor unit 1 into various shapes by adjusting the positional relationship or inclination angle of the back raising frame 41, the knee raising arms 51L, 51R, the first link 71L, 71R, and the second link 72L, 72R.

FIG. 4 is a side view schematically showing an example of the shape of the floor unit 1. In the bottom plate unit 1 shown in FIG. 4(a), the back bottom plate 10, the waist bottom plate 11, and the foot bottom plate 12 are all arranged horizontally as in the example of FIG. Hereinafter, the shape of the floor unit 1 in which at least the back floor 10 is horizontal (parallel to the X-Y plane) is referred to as a lying state.

In the bottom plate unit 1 shown in FIG. 4(b), as in the example of FIG. 2, the back bottom plate 10 stands up in the Z direction, and the waist bottom plate 11 and the foot bottom plate 12 are curved. Specifically, the first waist bottom plate 13 stands up in the Z direction, and the foot bottom plate 12 is formed in an upwardly convex shape such that the knee bottom plate 16 is located above the thigh bottom plate 15 and the respective panels 17 and 18.

In the bottom plate unit 1 shown in FIG. 4(c), the plates 17 and 18 are located below the waist bottom plate 11 and the thigh bottom plate 15. The thigh bottom plate 15 is located, for example, near the foot side end 3a of the bed frame 3 described above, and forms a sitting surface together with the waist bottom plate 11. The knee bottom plate 16 extends in the Z direction between the thigh bottom plate 15 and the first plate 17. Hereinafter, the shape of the floor unit 1 like this is referred to as a sitting state.

The bottom plate unit 1 shown in FIG. 4(d) is also in a sitting state. Compared with the example of FIG. 4(c), the bottom plate unit 1 is tilted forward as a whole. The "forward tilt" in this embodiment means that the bottom unit 1 rotates so that at least the upper end of the back bottom plate 10 faces the foot side, and the lower end of the back bottom plate 10 faces the head side. The shape of the bottom plate unit 1 deformed into such a shape is helpful to assist the user in the action of getting up from the sitting position.

In this way, the bottom plate unit 1 can be transformed into the sitting state shown in Fig. 4(c)(d) from the lying state shown in Fig. 4(a) through the shape shown in Fig. 4(b).

In the following description, the action of raising the back plate 10 as shown in FIGS. 4(b) to (c) is referred to as raising the back. In addition, the action of raising the thigh bottom plate 15 in the Z direction as shown in FIG. 4(b) is called a knee lift. In addition, the action of tilting the floor unit 1 in the sitting position forward as shown in FIG. 4(d) is called waist raising.

In FIGS. 4(a) to (c), the distance D at which the first plate 17 and the second plate 18 overlap is shown. The distance D or the overlapping area S of the plates 17, 18 increases from the lying state shown in Fig. 4(a) to the seat state shown in Fig. 4(c). That is, when deforming from the lying state to the seated state, the first plate 17 and the second plate 18 slide in a direction in which the area overlapping each other increases.

The command to transform from the lying position shown in Fig. 4(a) to the sitting position shown in Fig. 4(c) can be input through the above-mentioned seat deformation button 5a. That is, when the sitting position deformation button 5a is continuously pressed in the lying position, the drive mechanism 2 gradually transforms the floor unit 1 into the sitting position. During this deformation, if the depression of the seat deformation button 5a stops, the deformation of the floor unit 1 will also stop.

After the bottom plate unit 1 is deformed toward the sitting position, even if the seat deformation button 5a is continuously pressed as it is, the bottom plate unit 1 will not be deformed. On the other hand, when the depression of the seat deformation button 5a is stopped for a while, and then the button 5a is pressed again, the drive mechanism 2 causes the floor unit 1 to tilt forward as shown in FIG. 4(d).

Furthermore, the aforementioned input device 5 also has a button, which can be used to input an instruction to change the floor unit 1 from the sitting state to the lying state. While pressing this button, the bottom plate unit 1 will slowly deform from the state shown in Fig. 4(d) to the lying state shown in Fig. 4(a).

FIG. 5 is a side view schematically showing another example of the shape of the floor unit 1. As shown in Fig. 5(a), in the lying position, the thigh bottom plate 15 may be raised in the Z direction from the horizontal state to perform the knee raising. If the knee is raised in the lying position like this, the knees of the user in the supine position can be bent.

In addition, as shown in FIG. 5(b), in the sitting state, the thigh bottom plate 15 may be raised in the Z direction from the horizontal state to perform knee raising. If the knee is raised in the sitting state like this, it becomes difficult for the user sitting on the floor unit 1 to slip off the sitting surface.

Fig. 6 is a plan view showing the outline of the bed device B in a state where the floor unit 1 is removed. The above-mentioned driving mechanism 2 includes: a lifting mechanism 20 including a lifting motor M1; a sliding mechanism 30 including a first sliding motor M2 and a second sliding motor M3; a back lifting mechanism 40 including a back lifting motor M4; The knee raising mechanism 50 of the knee motor M5; and the waist raising mechanism 60 including the waist raising motor M6. The motors M1 to M6 are examples of drive sources.

The details will be described later, and the sliding mechanism 30 includes a first sliding frame 31 and a second sliding frame 32. The first sliding frame 31 is installed so as to be slidable with respect to the bed frame 3. The second sliding frame 32 is mounted so as to be slidable with respect to the first sliding frame 31.

The first sliding frame 31 includes a horizontal frame 33 and an inclined frame 34. The horizontal frame 33 is parallel to the X-Y plane. The inclined frame 34 may be inclined with respect to the horizontal frame 33. The inclined frame 34 is provided with: the above-mentioned back raising frame 41; a pair of fixing pins 35; a pair of knee raising arms 51L, 51R, a pair of knee raising rollers 52L, 52R, and the like.

Hereinafter, the lifting mechanism 20, the sliding mechanism 30, the back lifting mechanism 40, the knee lifting mechanism 50, and the waist lifting mechanism 60 will be described in detail in this order.

[Lifting mechanism 20] FIG. 7 is a perspective view for explaining the outline of the lifting mechanism 20. As shown in FIG. In this figure, elements not related to the lifting mechanism 20 are omitted.

One side of the bed frame 3 and the bottom frame 4 in the Y direction is connected by a first lift link 21L and a second lift link 22L intersecting in an X shape. The bed frame 3 and the bottom frame 4 on the other side in the Y direction are connected by a first lift link 21R and a second lift link 22R that cross each other in an X shape.

The first elevating link 21L and the second elevating link 22L are connected by a rotating shaft 23. One end of the first lift link 21L is connected through a bracket 211 so as to be rotatable with respect to the bottom frame 4. A roller 212 is provided at the other end of the first lift link 21L. The roller 212 can roll in the X direction in the rail 24 provided in the bed frame 3.

One end of the second lifting link 22L is connected through a bracket 221 so as to be rotatable with respect to the bed frame 3. It is not shown in Fig. 7, but a roller is provided at the other end of the second lifting link 22L. The roller can roll in the X direction in the rail 25 provided in the bottom frame 4.

Furthermore, the structure in which the first lift link 21R and the second lift link 22R are connected to the bed frame 3 and the bottom frame 4, respectively, and the first lift link 21L and the second lift link 22L are connected to these frames 3 , 4 have the same structure.

The lifting motor M1 is provided with a cylindrical cylinder C1 and a rod R1 accommodated in the cylinder C1. Along with the action of the lift motor M1, the protrusion amount of the rod R1 from the cylinder C1 changes. The lift motor M1 is connected so as to be rotatable with respect to the bracket B11 provided on the bottom frame 4. The front end of the rod R1 is connected so as to be rotatable with respect to the bracket B12 provided with the push-up member 26 which is long in the Y direction. The push-up member 26 is in contact with the lower surfaces of the first elevating links 21L, 21R.

The lift motor M1 is driven to increase the protrusion amount of the rod R1 from the cylinder C1, and the push-up member 26 pushes the first lift links 21L, 21R upward. Thereby, the rollers 212 of the first elevating links 21L and 21R roll on the rail 24, and the rollers of the second elevating links 22L and 22R roll in the rail 25. The bed frame 3 is pushed up in the Z direction by the first lifting links 21L, 21R and the second lifting links 22L, 22R, and is raised relative to the bottom frame 4. Conversely, after the protrusion amount of the rod R1 from the cylinder C1 is reduced, the bed frame 3 descends toward the bottom frame 4. With such a lifting mechanism 20, the floor unit 1 can be raised and lowered.

[Sliding Mechanism 30] 8 and 9 are plan views for explaining the outline of the sliding mechanism 30. As shown in FIG. In these figures, elements not related to the sliding mechanism 30 are omitted.

The bed frame 3 has a pair of rails 36L and 36R arranged at intervals in the Y direction. The rails 36L and 36R both extend in the X direction. The first sliding frame 31 and the second sliding frame 32 described above are arranged between the rails 36L and 36R.

The horizontal frame 33 of the first slide frame 31 has: a pair of frame members 331L, 331R arranged at intervals in the Y direction; and a connecting member that connects the ends of the frame members 331L, 331R on the head side (left side in the figure). 332. The frame materials 331L and 331R both extend in the X direction.

Furthermore, the horizontal frame 33 has a plurality of rods 333 extending from the frame members 331L and 331R to the outside of the frame 33. In FIG. 8, as shown by breaking a part of the rail 36L, a roller 334 is provided at the front end of each rod 333. With these rollers 334 rolling in the rails 36L and 36R, the first sliding frame 31 can be slid in parallel to the X direction with respect to the bed frame 3.

The inclined frame 34 of the first sliding frame 31 has: a pair of frame members 341L and 341R arranged at intervals in the Y direction; a connecting member 342 that connects the ends of the frame members 341L and 341R on the head side (left side in the figure); And a connecting member 343 that connects the end portions of the frame members 341L and 341R on the foot side (the right side in the figure). For details, which will be described later with reference to FIGS. 21 and 22, the frame members 341L and 341R are respectively connected so as to be rotatable with respect to the frame members 331L and 331R. The aforementioned pair of fixing pins 35 are respectively provided on the frame members 341L and 341R.

The second slide frame 32 has a pair of rails 321L and 321R arranged at intervals in the Y direction, and a connecting member 322 that connects the end portions on the foot side (right side in the figure) of these rails 321L and 321R. The rails 321L and 321R both extend in the X direction.

The inclined frame 34 has a plurality of rods 344 extending from frame members 341L and 341R to the outside of the frame 34. In FIG. 8, as shown by breaking a part of the rail 321R, a roller 345 is provided at the front end of each rod 344. With these rollers 345 rolling in the rails 321L and 321R, the second sliding frame 32 can slide with respect to the first sliding frame 31 (inclined frame 34).

The first sliding motor M2 (first driving source) is provided with a cylindrical cylinder C2 and a rod R2 accommodated in the cylinder C2. Along with the operation of the first slide motor M2, the protrusion amount of the rod R2 from the cylinder C2 changes.

The first slide motor M2 is connected to a bracket B21 provided in the bed frame 3. Below the cylinder C2, there is provided a protruding member 335 extending in the X direction from the connecting member 332 of the horizontal frame 33 toward the inner side of the first slide frame 31 (refer to FIG. 9). The front end of the rod R2 is connected to the bracket B22 provided on the protruding member 335.

A cylindrical cylinder C3 and a rod R3 accommodated in the cylinder C3 are provided in the second sliding motor M3 (second drive source). Along with the operation of the second slide motor M3, the protrusion amount of the rod R3 from the cylinder C3 changes.

The second slide motor M3 and the cylinder C3 are arranged on a bracket B31 that is long in the X direction of the connecting members 342 and 343 attached to the inclined frame 34, and is supported by the bracket B31. The front end of the rod R3 is connected so as to be rotatable with respect to the bracket B32 of the connecting member 322 provided in the second slide frame 32. In such a configuration, when the waist is raised by the waist raising mechanism 60 described later, the second slide motor M3, the air cylinder C3, and the rod R3 are inclined with respect to the horizontal frame 33 together with the tilt frame 34 and the second slide frame 32.

The positional relationship between the first sliding frame 31 and the second sliding frame 32 shown in FIG. 8 corresponds to the lying state. On the other hand, the positional relationship between the first sliding frame 31 and the second sliding frame 32 shown in FIG. 9 corresponds to the sitting state.

That is, in the lying state, the rod R2 of the first slide motor M2 is accommodated in the cylinder C2 to the maximum, and the rod R3 of the second slide motor M3 protrudes from the cylinder C3 to the maximum. Thereby, the second sliding frame 32 largely protrudes from the first sliding frame 31 toward the foot side (right side in the figure).

When deforming from the lying position shown in Fig. 8 to the sitting position shown in Fig. 9, the rod R2 is sent out from the cylinder C2 by the first sliding motor M2, and the rod R3 is pulled into the cylinder M3 by the second sliding motor M3. . At this time, the first slide frame 31, the second slide motor M3, and the like press the bed frame 3 in the X direction (first direction). In addition, the second sliding frame 32 is pulled in the opposite direction of the X direction (the second direction) with respect to the first sliding frame 31 and the bed frame 3. In the example of FIG. 9, the foot-side end (connection member 322) of the second sliding frame 32 is located closer to the head than the foot-side end (connection member 343) of the first sliding frame 31.

With this sliding action, in the sitting state shown in FIG. 9, the first sliding frame 31 moves toward the foot side of the bed frame 3 than in the lying state shown in FIG. 8. Furthermore, the second sliding frame 32 moves to the head side of the bed frame 3 from the lying position shown in FIG. 8.

With the action of the sliding mechanism 30 described above, when the floor unit 1 deforms from the lying position shown in FIG. 4(a) to the sitting position shown in FIG. 4(c), the thigh floor 15 is positioned on the foot of the bed frame 3. The end of the side. Furthermore, the first plate 17 and the second plate 18 are drawn under the waist bottom plate 11.

FIG. 10 is a schematic perspective view of a link mechanism that connects the first plate 17 and the second plate 18 with the second slide frame 32. Fig. 11 is a schematic exploded perspective view of the main elements shown in Fig. 10.

As shown in FIGS. 10 and 11, on the lower surface of the front end portions of the rails 321L, 321R, first mounting members 73L, 73R each extending in the X direction are provided. On the inner surfaces of the first mounting members 73L, 73R facing each other, second mounting members 74L, 74R each extending in the Y direction are provided.

As shown in FIG. 11, a lattice-shaped frame 171 is attached to the back surface of the first plate 17. Furthermore, the first plate 17 has slits 172 in the vicinity of both ends in the Y direction. On the other hand, on the back surface of the second plate 18, grooves 181 are formed at both ends in the Y direction, respectively. By inserting the two ends of the first plate 17 divided by the slits 172 into the groove 181, the first plate 17 is mounted so as to be slidable with respect to the second plate 18.

The first links 71L and 71R described above each have a first bracket 711, a second bracket 712, and an arm 713. The first bracket 711 of the first link 71L is attached to the second attachment member 74L. The first bracket 711 of the second link 72R is attached to the second attachment member 74R. The respective second brackets 712 of the first links 71L and 71R are attached to the frame 171.

In each of the first links 71L and 71R, one end of the arm 713 is connected by a first rotating shaft 714 so as to be rotatable with respect to the first bracket 711, and the other end of the arm 713 is connected by a second rotating shaft 715. It is rotatable relative to the second bracket 712.

The second links 72L, 72R each have a bracket 721 attached to the first attachment members 73L, 73R, and an arm 722 attached to the back of the second plate 18. In each of the second links 72L and 72R, the bracket 721 and the arm 722 are rotatably connected by a rotating shaft 723.

Fig. 12 is a schematic side view of the floor unit 1 in the middle of being deformed to the sitting state. Fig. 13 is a schematic side view of the floor unit 1 in a sitting state. In each figure, the second slide motor M3, the cylinder C3, the rod R3, the first link 71R, and the second link 72R are also shown.

In FIG. 12, the rod R3 protrudes from the cylinder C3. In Fig. 13, the rod R3 is accommodated in the cylinder C3 to the maximum. While the rod R3 is slowly accommodated in the cylinder C3 in this way, the first plate 17 and the second plate 18 are slowly drawn under the waist bottom plate 11.

At this time, the first link 71R (71L) is rotated by the aforementioned first rotation shaft 714 and the second rotation shaft 715, and the second link 72R (72L) is rotated by the aforementioned rotation shaft 723. The second plate 18 rotates with a single axis, and therefore draws a perfect circular trajectory. On the other hand, the first plate 17 uses two axes to rotate, so it can draw a more complicated trajectory.

Assuming that the first plate 17 is also rotated by a single axis, the two plates 17 and 18 cannot be pulled in to the position shown in FIG. 13 while sliding relative to each other. In contrast, when the first plate 17 is rotated with two axes, the two plates 17 and 18 can be pulled in to the position shown in FIG. 13 while sliding relative to each other.

And, as the pulling-in progresses, the overlapping area of the first plate 17 and the second plate 18 increases, and the two plates 17, 18 become smaller. In this way, the height from the floor surface required for rotation is also solved as long as it is low.

Furthermore, as long as the number (M) of the rotating shafts of the first link 71L, 71R and the number (N) of the rotating shafts of the second link 72L, 72R are different from each other, it is not It is limited to the case of M=2 and N=1 as in this embodiment. Moreover, as long as M and N are different, the relationship of M<N can also be established.

[Back Lifting Mechanism 40] 14 and 15 are perspective views for explaining the outline of the back raising mechanism 40. As shown in FIG. In these figures, elements not related to the back lifting mechanism 40 are omitted.

The above-mentioned back lifting frame 41 has a back lifting main shaft 42 extending in the Y direction and longer supporting members 43L and 43R connected to the back lifting main shaft 42. The back-lifting spindle 42 is connected so as to be rotatable relative to the frame members 341L and 341R of the inclined frame 34.

Two rollers 44 are respectively provided on the inner surfaces of the support members 43L and 43R facing each other. In addition, two movable rods 45 are provided on the outer surfaces of the support members 43L and 43R, respectively. The front end of each movable rod 45 is provided with a roller 46.

The back lifting motor M4 is provided with a cylindrical cylinder C4 and a rod R4 accommodated in the cylinder C4. Along with the action of the back lift motor M4, the protrusion amount of the rod R4 from the cylinder C4 changes. The back raising motor M4 is connected so as to be rotatable with respect to the bracket B41 of the connecting member 343 provided on the inclined frame 34. The front end of the rod R4 is connected so as to be rotatable with respect to the bracket B42 provided on the back lifting main shaft 42.

Fig. 14 corresponds to the lying position, and the support members 43L, 43R are parallel to the X direction. In this state, after the rod R4 is sent out from the cylinder C4 by the back lifting motor M4, the back lifting spindle 42 is rotated through the bracket B42. As a result, as shown in FIG. 15, the supporting members 43L, 43R rotate around the back-lifting spindle 42 to stand up.

The back bottom plate 10 is supported by the back lifting frame 41. That is, as the posture of the back raising frame 41 is changed from the state shown in FIG. 14 to the state shown in FIG. 15, the back plate 10 is changed from the horizontal state shown in FIG. 4(a) as shown in FIG. 4(b)(c). Stand up.

FIG. 16 is a diagram showing an example of the supporting structure of the back bottom plate 10 supported by the back raising frame 41. In the example shown in the figure, a pair of rails 47L and 47R are provided on the back surface of the center bottom plate 10C. These rails 47L, 47R extend in an elongated shape along the longitudinal direction of the center floor 10C (the X direction in the lying state), and are located between the support members 43L, 43R.

In FIG. 16, as shown by breaking a part of the rail 47R, the rollers 44 provided in the support members 43L and 43R are located in the rails 47L and 47R, respectively. That is, the center bottom plate 10C is supported by the rails 47L, 47R and the rollers 44 so as to be slidable in the longitudinal direction with respect to the support members 43L, 43R.

The positional relationship between the support members 43L, 43R and the rails 47L, 47R shown in FIG. 16 corresponds to the sitting state. For example, focusing on the movable rod 45 on the upper left in the figure, in the lying state, the movable rod 45 will be located at the position P1 shown by the dashed line. When deforming from the lying state to the sitting state, as the back raising frame 41 stands up, the support members 43L, 43R slide, and the movable rod 45 moves to the position P2 in the figure.

The side bottom plate 10L is connected to the left side of the center bottom plate 10C by two hinges 48. Similarly, the side bottom plate 10R is connected to the right side of the center bottom plate 10C by two hinges 48.

Two protrusions 49 are provided on the back surfaces RF of the side bottom plates 10L and 10R, respectively. Each protrusion 49 extends along the longitudinal direction (direction orthogonal to the Y direction) of the side bottom plates 10L and 10R, and is arranged at a position corresponding to the movable rod 45 and the roller 46.

The movable rod 45 has a rotating shaft 45a in the middle thereof, and the rotating shaft 45a can be bent at the center. In the example of FIG. 16, each movable rod 45 is bent at a right angle. In this case, each roller 46 retreats to a position where it does not overlap with each protrusion 49. On the other hand, regarding the movable rod 45 and the roller 46 on the upper right in FIG. 16, as shown by the broken line, when the movable rod 45 is linearly extended, the roller 46 overlaps the protrusion 49.

FIG. 17 is a perspective view schematically showing the back surface of the backing plate 10 and a part of the roller 46. In this figure, the movable rod 45 extends linearly, and the roller 46 overlaps the protrusion 49.

The protruding portion 49 has an inclined surface 49 a that is in contact with the roller 46. For example, the inclined surface 49a is a curved surface whose height from the back surface RF of the side bottom plates 10L, 10R increases as it goes downward (in the direction of the waisted bottom plate 11) in the figure, and is more inclined toward the center bottom plate 10C.

The roller 46 in FIG. 17 is at the position P1 in the lying state. At this time, the center bottom plate 10C is parallel to the side bottom plates 10L, 10R to form a flat back plate 10.

When deforming to the sitting position, the roller 46 rolls on the inclined surface 49a from the position P1 where the height from the back surface RF is small to the position P2 where the height is large. Thereby, the protruding portion 49 is pushed by the roller 46, and the side bottom plates 10L and 10R rotate around the rotation axis of the hinge 48 and are inclined with respect to the center bottom plate 10C as shown by the broken line.

If the side bottom plates 10L, 10R incline in this way, the user's upper body is supported on the left and right sides in the sitting state, so the safety of the bed device B is improved. Furthermore, the details of the structure for tilting the side bottom plates 10L, 10R can also be applied to the structure disclosed in Japanese Patent No. 3910873.

[Knee Lifting Mechanism 50] 18 and 19 are perspective views for explaining the outline of the knee raising mechanism 50. As shown in FIG. In these figures, elements not related to the knee raising mechanism 50 are omitted.

Between the frame members 341L and 341R of the inclined frame 34, a knee lift spindle 53 extending in the Y direction is arranged. The knee raising spindle 53 is connected so as to be rotatable relative to the frame members 341L and 341R.

One ends of the above-mentioned knee raising arms 51L and 51R are connected to the knee raising main shaft 53. The above-mentioned knee-lift rollers 52L, 52R are attached to the other ends of the knee-lift arms 51L, 51R, respectively.

The knee lift motor M5 is provided with a cylindrical cylinder C5 and a rod R5 accommodated in the cylinder C5. Along with the action of the knee lift motor M5, the protrusion amount of the rod R5 from the cylinder C5 changes. The knee lift motor M5 is connected so as to be rotatable with respect to the bracket B51 of the connecting member 342 provided on the inclined frame 34. The front end of the rod R5 is connected so as to be rotatable with respect to the bracket B52 provided on the knee lift main shaft 53.

FIG. 18 corresponds to the state where the knee is not raised, and the knee raising arms 51L and 51R are parallel to the X direction. In this state, the rod R5 is sent out from the cylinder C5 by the knee lift motor M5, and the knee lift spindle 53 is rotated through the frame B52. As a result, as shown in FIG. 19, the knee raising arms 51L and 51R rotate together with the knee raising main shaft 53 and stand up.

Fig. 20 is a schematic cross-sectional view taken along the line F20-F20 of each element shown in Fig. 19. In this figure, the thigh bottom plate 15 is also shown. The knee lifter 52R (52L) is in contact with the back surface of the thigh bottom plate 15.

When the knee raising arm 51R (51L) rotates from the state shown in FIG. 18 to the state shown in FIG. 19, the knee raising roller 52R (52L) pushes up the back of the thigh bottom plate 15, as shown in FIG. 20, the thigh bottom plate 15 is inclined with respect to the X direction.

Elements such as the knee-lift motor M5, the knee-lift spindle 53, the knee-lift arms 51L, 51R, and the knee-lift rollers 52L, 52R are supported by the first sliding frame 31 (inclined frame 34). Therefore, these elements can slide together with the first sliding frame 31, and the knee lift rollers 52L and 52R are located directly below the thigh bottom plate 15 regardless of the lying state and the sitting state. Therefore, as shown in Figure 5(a)(b), knee lifts can be performed in both the lying position and the sitting position.

[Waist Lifting Mechanism 60] 21 and 22 are perspective views for explaining the outline of the waist raising mechanism 60. As shown in FIG. In these figures, elements not related to the waist raising mechanism 60 are omitted.

The horizontal frame 33 and the inclined frame 34 are rotatably connected by a pair of rotating shafts 61L and 61R. Specifically, the rotating shaft 61L connects the frame member 331L of the horizontal frame 33 and the frame member 341L of the inclined frame 34 in a rotatable manner. In addition, the rotating shaft 61R is rotatably connected to the frame member 331R of the horizontal frame 33 and the frame member 341R of the inclined frame 34.

In the example of FIG. 21 and FIG. 22, the frame materials 341L and 341R are lids which open downward, and the inclined frame 34 is not inclined, and is covered with the frame materials 331L and 331R as shown in FIG. 21, respectively.

The waist raising motor M6 is provided with a cylindrical cylinder C6 and a rod R6 accommodated in the cylinder C6. Along with the action of the waist raising motor M6, the protrusion amount of the rod R6 from the cylinder C6 changes. The waist raising motor M6 is connected so as to be rotatable with respect to the bracket B61 of the connecting member 332 provided on the horizontal frame 33. The front end of the rod R6 is connected so as to be rotatable with respect to the bracket B62 of the connecting member 342 provided on the inclined frame 34. The connecting member 342 is located above the connecting member 332. The cylinder C6 and the rod R6 are inclined so that the front end side of the cylinder C6 and the rod R6 is located upward in the state where the inclined frame 34 is not inclined.

FIG. 21 corresponds to the sitting state without waist-up, and the frame members 341L and 341R are parallel to the X direction. In this state, after the rod R6 is sent out from the cylinder C6 by the waist raising motor M6, as shown in FIG. 22, the head side (left side in the figure) of the inclined frame 34 is raised. Elements such as the second sliding frame 32 supported by the inclined frame 34, the back raising frame 41, and the knee raising arms 51L and 51R are also inclined together with the inclined frame 34.

Fig. 23 is a schematic cross-sectional view taken along the line F23-F23 of each element shown in Fig. 22. In this figure, the bottom plate unit 1 is also shown. The elements supporting the floor unit 1, such as the back raising frame 41, the knee raising frames 51L, 51R, the first links 71L, 71R, and the second links 72L, 72R (refer to FIG. 10), are all set in the inclined frame 34 or the second sliding Frame 32.

That is, the back base 10, the waist base 11, and the foot base 12 are supported by the inclined frame 34 and the second sliding frame 32. Therefore, when the waist raising action is performed by the waist raising mechanism 60, as also shown in FIG. 4(d), the floor unit 1 in the sitting state is tilted forward as a whole.

If the lifting mechanism 20, sliding mechanism 30, back lifting mechanism 40, knee lifting mechanism 50, and waist lifting mechanism 60 described above are used, as shown in FIGS. 4 and 5, the floor unit 1 can be transformed into a lying state and a sitting state Or even other shapes, or change the height of the floor unit 1 from the floor surface. Thereby, it becomes easy for the user to change the posture or get up from the bed device B.

In this embodiment, as shown in FIG. 5(a)(b), the knee can be raised in both the lying position and the sitting position. It is assumed that when the knee raising in the lying position and the sitting position is realized by separate mechanisms, the number of parts of the bed device will increase, and the manufacturing cost will also increase. Furthermore, it may be difficult to secure a space for arranging various mechanisms under the floor unit. In contrast to this, in the present embodiment, the same knee raising mechanism 50 can raise the knee in both the lying position and the sitting position, so these problems can be suppressed.

In this embodiment, the end of the foot sole plate 12 is composed of a first plate 17 and a second plate 18, and these plates 17, 18 are connected to each other through first links 71L, 71R and second links 72L, 72R. The second sliding frame 32. In addition, the number of rotation axes of the first links 71L and 71R is different from the number of rotation axes of the second links 72L and 72R. With such a configuration, when deforming from the lying position to the sitting position, the first plate 17 and the second plate 18 can be pulled in under the waist bottom plate 11 while sliding relative to each other.

As explained with reference to FIG. 4, the overlapping area of the first plate 17 and the second plate 18 in the sitting position is smaller than the overlapping area of the first plate 17 and the second plate 18 in the lying position. In this case, the area of the floor unit 1 in the lying position can be ensured, and the foot floor 12 in the sitting position can be miniaturized.

In the present embodiment, the seat deformation button 5a used to deform the floor unit 1 from the lying position to the sitting position is pressed again after the deformation to the sitting position is completed, and the waist raising mechanism 60 can make the floor Unit 1 leans forward (lifts the waist). As long as the deformation to the sitting state and the subsequent waist raising are performed with a single button operation, a series of actions for the user to get off the bed device B can be performed very smoothly.

In this embodiment, with the structure including the roller 46 and the ridge portion 49 described with reference to Figs. 16 and 17, the side bottom plates 10L, 10R are inclined with respect to the center bottom plate 10C when deformed to the sitting position. Thereby, the user's upper body is supported on the left and right sides in the sitting state, so the safety of the bed device B is improved. In addition, since the side bottom plates 10L, 10R incline in accordance with the action of the back lifting mechanism 40 that raises the back bottom plate 10, there is no need for a dedicated drive source for tilting the side bottom plates 10L, 10R.

In addition, when it is not necessary to incline the side bottom plates 10L, 10R, as shown in FIG. 16, the movable rod 45 may be first retracted to a position where it does not overlap the protrusion 49.

In addition to this, various suitable effects can be obtained from this embodiment. According to this embodiment, the convenience of the bed device B that can be deformed from the lying state to the sitting state is significantly improved.

In addition, the above-mentioned embodiment does not limit the scope of the present invention to the structure disclosed in this embodiment. The present invention can be implemented by modifying the configuration disclosed in the above embodiment into various aspects.

1: Floor unit 2: drive mechanism 3: bed frame 3a: end 4: bottom frame 4a: feet 5: Input device 5a: Seat deformation button 5b: Wire 6: Control device 10: back plate 10C: Central bottom plate 10L, 10R: side bottom plate 11: Waist floor 12: Foot soleplate 13: No. 1 waist sole 14: 2nd waist bottom 14a: hole 15: Thigh floor 16: Knee floor 17: The first plate 18: The second plate 20: Lifting mechanism 21L, 21R: 1st lifting link 22L, 22R: 2nd lifting link 23: Rotating shaft 24, 25: Orbit 26: Push up the component 30: Sliding mechanism 31: 1st sliding frame 32: 2nd sliding frame 33: horizontal frame 34: Tilt frame 35: fixed pin 36L, 36R: rail 40: back lifting mechanism 41: Raise the back frame 42: Back spindle 43L, 43R: Supporting member 44: Roll 45: movable rod 45a: Rotating shaft 46: Roll 47L, 47R: rail 48: hinge 49: Protruding section 49a: Inclined surface 50: Knee lift mechanism 51L, 51R: Knee up 52L, 52R: knee lift roller 53: Knee lift spindle 60: Waist lifting mechanism 61L, 61R: Rotating shaft 71L, 71R: 1st link 72L, 72R: 2nd link 73L, 73R, 74L, 74R: 1st mounting member 171: Frame 172: Gap 181: ditch 211: Bracket 212: Roll 221: Bracket 321L, 321R: rail 322: Connection member 331L, 331R: frame material 332: Connection member 333: Rod 334: Roll 335: Protruding member 341L, 341R: frame material 342, 343: Connecting components 344: rod 345: Roll 711,712: The first bracket 713: arm 714: first rotating shaft 715: 2nd rotating shaft 721: bracket 722: arm 723: Rotating Shaft B: Bed device B11, B12, B21, B22, B31, B32, B41, B42, B51, B52, B61, B62: Bracket C1, C2, C3, C4, C5, C6: cylinder D: distance F20, F23: line M1: Lifting motor M2: 1st sliding motor M3: 2nd sliding motor M4: Back lift motor M5: Knee lift motor M6: waist lift motor P1, P2: position R1, R2, R3, R4, R5, R6: rod RF: back S: area X, Y, Z: direction

Fig. 1 is a schematic perspective view of a bed device according to an embodiment. Fig. 2 is another schematic perspective view of the bed device. Fig. 3 is a schematic side view of the above-mentioned bed device. Fig. 4 is a side view schematically showing several examples of the shape of the floor unit included in the bed device. Fig. 5 is a side view schematically showing another example of the shape of the floor unit. Fig. 6 is a plan view showing the outline of the bed device in a state where the above-mentioned floor unit is removed. Fig. 7 is a perspective view for explaining the outline of an elevating mechanism included in the bed device. Fig. 8 is a plan view for explaining the outline of a sliding mechanism included in the bed device. Fig. 9 is a plan view for explaining another outline of the above-mentioned sliding mechanism. Fig. 10 is a schematic perspective view of a link mechanism that connects the first and second panels and the second slide frame included in the bed device. Fig. 11 is a schematic exploded perspective view of the main elements shown in Fig. 10. Fig. 12 is a schematic side view of the floor unit in the middle of being transformed into a sitting state. Fig. 13 is a schematic side view of the above-mentioned floor unit in a sitting state. Fig. 14 is a perspective view for explaining the outline of a back raising mechanism included in the bed device. Fig. 15 is a perspective view for explaining another outline of the above-mentioned back raising mechanism. Fig. 16 is a diagram showing an example of the support structure of the back plate supported by the back raising frame provided in the back raising mechanism. Fig. 17 is a perspective view schematically showing the back surface and the like of the back plate. Fig. 18 is a perspective view for explaining the outline of a knee raising mechanism included in the bed device. Fig. 19 is a perspective view for explaining another outline of the above-mentioned knee raising mechanism. Fig. 20 is a schematic cross-sectional view taken along the line F20-F20 of each element shown in Fig. 19. Fig. 21 is a perspective view for explaining the outline of a waist raising mechanism included in the bed device. Fig. 22 is a perspective view for explaining another outline of the above-mentioned waist raising mechanism. Fig. 23 is a schematic cross-sectional view taken along the line F23-F23 of each element shown in Fig. 22.

1: Floor unit

2: drive mechanism

3: bed frame

4: bottom frame

4a: feet

5: Input device

5a: Seat deformation button

5b: Wire

10: back plate

10C: Central bottom plate

10L: side bottom plate

10R: side bottom plate

11: Waist floor

12: Foot soleplate

13: No. 1 waist sole

14: 2nd waist bottom

14a: hole

15: Thigh floor

16: Knee floor

17: The first plate

18: The second plate

B: Bed device

X, Y, Z: direction

Claims (10)

A bed device with: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; The sole plate of the foot includes the sole plate of the thigh connected to the aforementioned waist sole plate; and The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and a sitting position in which the back board stands up and the thigh board is located at the end of the bed frame status, The driving mechanism may rotate the thigh bottom plate using one end of the thigh bottom plate connected to the waist bottom plate as an axis in each of the lying position and the sitting position state. The bed device of claim 1, wherein in the sitting state, the foot sole is bent so that a part of the foot sole is located below the waist sole. The bed device of claim 2, wherein the driving mechanism includes: a first sliding frame that supports the back bottom plate and the waist bottom plate and is installed on the bed frame; and a second sliding frame that supports the foot bottom plate and is installed on the aforementioned bed frame The first sliding frame, When deforming from the lying state to the sitting state, the first sliding frame moves in a first direction relative to the bed frame, and the second sliding frame moves relative to the first sliding frame in a second direction opposite to the first direction. When the second sliding frame moves in the second direction, a part of the foot sole is pulled in below the waist sole. The bed device of claim 3, wherein the drive mechanism includes: a main shaft arranged on the first sliding frame; an arm connected to the main shaft; a roller arranged on the front end of the arm and connected to the back of the thigh bottom plate And a driving source, which rotates the arm and the roller with the main shaft as the shaft In each of the lying state and the sitting state, the drive source rotates the arm and the roller with the main shaft as the axis, and the thigh bottom plate is connected to the thigh portion of the waist bottom plate. One end of the bottom plate is used as a shaft to rotate. A bed device with: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; The sole plate of the foot includes a first plate and a second plate that at least partially overlap each other; and The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and the back board stands up and the first board and the second board are located at the waist The sitting position under the floor, The aforementioned drive mechanism includes: The first sliding frame supports the back bottom plate and the waist bottom plate, and is installed on the bed frame; The second sliding frame is installed on the aforementioned first sliding frame; The first link rotatably connects the first plate and the second sliding frame to a plurality of rotating shafts; and The second link rotatably connects the second plate and the second sliding frame to a different number of rotating shafts than the first link, When deforming from the lying state to the sitting state, the first sliding frame moves in a first direction relative to the bed frame, and the second sliding frame moves relative to the first sliding frame in a second direction opposite to the first direction. By moving in the direction, the first plate and the second plate are slid relative to each other while each being rotated by the first link and the second link toward the lower side of the waist bottom plate. Such as the bed device of claim 5, which slides in a direction in which the overlapping area of the first plate and the second plate increases when deforming from the lying state to the sitting state. The bed device of claim 5 or 6, wherein the drive mechanism includes: a first drive source installed on the bed frame, and when deformed from the lying state to the sitting state, the first sliding frame is moved to the first Directional pressing; and a second drive source, mounted on the first sliding frame, and when deformed from the lying state to the sitting state, the second sliding frame is pulled to the second direction. A bed device with: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; Foot sole plate, including the thigh sole plate connected to the aforementioned waist sole plate; The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and a sitting position in which the back board stands up and the thigh board is located at the end of the bed frame Status; and The input device includes buttons for inputting commands from the aforementioned lying state to the aforementioned sitting state, The aforementioned drive mechanism includes: Horizontal frame, installed on the aforementioned bed frame; and The inclined frame is connected to be rotatable relative to the horizontal frame and supports the back bottom plate and the waist bottom plate, Furthermore, the driving mechanism deforms the back sole plate, the waist sole plate, and the foot sole plate to the sitting position in response to the operation of the button in the lying position, and operates the button again after that to cause the The inclined frame is inclined with respect to the horizontal frame, so that at least the back plate is inclined forward. A bed device with: Bed frame Back plate The waist bottom plate is connected to the aforementioned back bottom plate; The sole plate of the foot includes the sole plate of the thigh connected to the aforementioned waist sole plate; and The driving mechanism transforms the back board, the waist board, and the foot board into a lying state in which at least the back board is horizontal, and a sitting position in which the back board stands up and the thigh board is located at the end of the bed frame status, The aforementioned back plate includes: The central bottom plate is connected with the aforementioned waist bottom plate; A pair of side bottom plates are connected to each other to be rotatable relative to the two sides in the width direction of the aforementioned central bottom plate; and A pair of protruding strips are provided on the respective back surfaces of the pair of side bottom plates and extend along the longitudinal direction intersecting the width direction, The driving mechanism includes a pair of rollers. When the pair of rollers are deformed from the lying state to the sitting state, they respectively push the pair of protruding portions, thereby causing the pair of side bottom plates to incline relative to the center bottom plate. . The bed device of claim 9, wherein each of the pair of protrusions has an inclined surface whose height from the back surface increases toward the waist bottom plate, When deforming from the lying state to the sitting state, each of the pair of rollers rolls on the inclined surface of the pair of protrusions from a position with a small height from the back surface to a position with a large height, thereby causing The pair of side bottom plates are each inclined with respect to the center bottom plate.

Images