Bed equipment

Abstract

The present invention provides a bed device that can be made low-profile and equipped with interlocking mechanisms such as a back-knee-bottom interlocking mechanism. [Solution] The bed device comprises a bed having a back bottom and a knee bottom, and a support frame that supports the bed. The support frame comprises a first rotating member 43 that rotates when the back bottom is raised, a second rotating member that rotates when the knee bottom is raised, an interlocking link 63 that connects the first rotating member 43 and the second rotating member and enables the rotation of the first rotating member 43 and the rotation of the second rotating member to be linked, and a crossing rod 53B that has a portion that intersects the interlocking link in a plan view. At least one of the interlocking link 63 and the crossing rod 53B has relief structures 53a, 63a that are deformed to avoid contact between them at the intersecting portion.

Description

Technical Field

[0001] The present invention relates to a bed device.

Background Art

[0002] Conventionally, as a bed device to which a back-knee-bottom interlocking mechanism shown in Patent Documents 1 and 2 is applied, the following configurations are exemplified. That is, in a bed frame in which a back bottom and a knee bottom are supported so as to be rotatable and elevable, an interlocking link is connected between a drive shaft that rotationally drives the back bottom and a drive shaft that rotationally drives the knee bottom. Thereby, with one drive source, both the raising of the back of the back bottom and the raising of the knees of the knee bottom can be performed simultaneously. Specifically, in order to raise the back of the back bottom, when power from a drive source is applied to a drive arm connected to the back bottom, the power is applied from an interlocking arm of the same drive shaft as the drive arm to the interlocking link. Further, the above power is applied to an interlocking arm of the knee bottom via the interlocking link, and to a pushing-up arm of the same drive shaft as the interlocking arm of the knee bottom. Thereby, when the back bottom is raised, the knee bottom is also pushed up at the same time.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] ​However, if the height from the ground to the top surface of the bed is set to, for example, 150 mm for the purpose of lowering the bed height, or if the mechanism must be housed in a space of about 150 mm above the top surface of the bed even if the height from the ground is sufficiently high, then in conventional configurations, the interlocking links provided on the main frame and the crossing rods that constitute the lifting mechanism must be placed in very close proximity due to space constraints. As a result, there is a risk that the interlocking links may come into contact with the crossing rods or the floor when the back-knee-bottom interlocking mechanism is in operation. Therefore, it has been difficult to sufficiently lower the bed height in conventional bed systems that have a back-knee-bottom interlocking mechanism. On the other hand, in bed systems with mechanical interlocking, these components are often essential for the operation of the components themselves. Therefore, it has been difficult to place the back-knee-bottom interlocking mechanism inside the bed system by, for example, reducing the number of parts and expanding the space.

[0005] The present invention has been made in view of the circumstances described above, and aims to provide a bed device that can operate interlocking mechanisms such as a back-knee-bottom interlocking mechanism without causing contact between components, even when the bed is lowered. [Means for solving the problem]

[0006] To solve the aforementioned problems, the present invention proposes the following means. A bed device according to one aspect of the present invention comprises a bed having a back bottom and a knee bottom, and a support frame that supports the bed, wherein the support frame comprises a first rotating member that rotates when the back bottom is raised, a second rotating member that rotates when the knee bottom is raised, an interlocking link that connects the first rotating member and the second rotating member and enables the rotation of the first rotating member and the rotation of the second rotating member to be linked, and a crossing rod having a portion that intersects the interlocking link in a plan view, wherein at least one of the interlocking link and the crossing rod has a relief structure that is deformed to avoid contact between them at the intersecting portion.

[0007] According to the above embodiment, contact between the crossing rod and the interlocking link can be reliably avoided by having a modified relief structure that prevents both from coming into contact with each other.

[0008] Both the interlocking link and the crossing rod may have relief structures that are deformed to avoid contact with each other at the intersecting portion.

[0009] According to the above embodiment, since both the crossing rod and the interlocking link, not just one of them, have a relief structure, contact between the crossing rod and the interlocking link can be more reliably avoided even when the back-knee bottom interlocking mechanism is operated within a low-floor bed device.

[0010] Furthermore, the relief structure of the interlocking link may be a first curved portion that curves in a direction away from the crossing rod, and the relief structure of the crossing rod may be a second curved portion that curves in a direction away from the interlocking link.

[0011] According to the above embodiment, the curved section, which has an easily manufactured shape, makes it possible to ensure sufficient distance at the intersection of the interlocking link and the crossing rod.

[0012] The support frame further comprises a base frame installed on the installation surface, a main frame to which the bed is fixed, and a lifting mechanism that allows the main frame to be raised and lowered relative to the base frame, wherein the crossing rod forms part of the lifting mechanism and is rotatably connected to the main frame, and the crossing rod may rotate when the lifting mechanism raises and lowers the main frame.

[0013] According to the above embodiment, since both the crossing rod and the interlocking link have a relief structure, interference between the crossing rod and the interlocking link can be avoided not only when the back-knee-bottom interlocking mechanism is in operation, but also when the crossing rod is rotating.

[0014] The cross bar has a straight portion arranged in a straight line different from the extension line of the rotation axis of the cross bar with respect to the main frame, and the relief structure of the cross bar may be arranged on the extension line of the rotation axis.

[0015] According to the above aspect, even when the lifting mechanism is operated, since the relief structure is arranged on the rotation axis, it is possible to avoid the cross bar from interfering not only with the link but also with other members.

Effect of the Invention

[0016] According to the bed device according to the above aspect of the present invention, it is possible to achieve a low floor height and include an interlocking mechanism.

Brief Description of the Drawings

[0017] [Figure 1] It is a plan view of a bed device according to an embodiment of the present invention. [Figure 2] It is a side view of the bed device shown in FIG. 1. [Figure 3] It is an exploded perspective view of a support base constituting the bed device shown in FIG. 1. [Figure 4] It is a plan view of the support base shown in FIG. 3. [Figure 5] It is a side view of the support base shown in FIG. 3. [Figure 6] It is a side view of the support base shown in FIG. 3, showing a state where the main frame is lifted by a lifting mechanism. [Figure 7] It is an enlarged perspective view for explaining the configuration of the bottom interlocking mechanism and the connecting rod in the present embodiment.

Mode for Carrying Out the Invention

[0018] A bed device 10 according to an embodiment of the present invention will be described below based on the drawings. The bed device 10 can be used, for example, in a medical environment (including a nursing environment). In FIGS. 1 to 6, arrow H indicates the direction of the head side when a person (user) lies down, and arrow F indicates the direction of the foot side when a person lies down. In the following description, the horizontal direction orthogonal to the front-rear direction, which is the direction of arrows H and F, may be referred to as the left-right direction.

[0019] As shown in FIGS. 1 to 6, the bed device 10 includes a bed 11, a support base 12, a drive mechanism 13, a board 14, and a control unit 15. The bed device 10 is a so-called electric bed that uses electric power as a power source. The bed 11 is longer in the front-rear direction than in the left-right direction when viewed in plan. The bed 11 includes a back bottom 16, a waist bottom 17, and a leg bottom 18, and these back bottom 16, waist bottom 17, and leg bottom 18 are arranged in this order from the head side H to the foot side F. The leg bottom 18 includes a knee bottom 19 and a foot bottom 20, and these knee bottom 19 and foot bottom 20 are arranged in this order from the head side H to the foot side F.

[0020] The upper surfaces of the back bottom 16, the waist bottom 17, and the leg bottom 18 (knee bottom 19 and foot bottom 20) respectively form a part of the bed surface 21. The back bottom 16 corresponds to the part that supports the back of the user on the bed surface 21, the waist bottom 17 corresponds to the part that supports the waist of the user on the bed surface 21, and the leg bottom 18 corresponds to the part that supports the legs of the user on the bed surface 21. The knee bottom 19 corresponds to the part that supports the waist from the knees of the user on the bed surface 21, and the foot bottom 20 corresponds to the part that supports the toes from the knees of the user on the bed surface 21. The waist bottom 17 is formed to be stretchable in the front-rear direction. The space between the knee bottom 19 and the foot bottom 20 is connected so as to be rotatable around a bending axis 22 extending in the left-right direction.

[0021] The bed surface 21 is an orthogonal surface perpendicular to the vertical direction in its standard state before the bed 11 is deformed by the drive mechanism 13, such as by raising the back or knees (for example, by rotation with undulation). In its plan view, the bed surface 21 is formed in a rectangular shape, longer in the front-to-back direction than in the left-to-right direction. The longitudinal direction of the bed surface 21 (bed 11) is the front-to-back direction, and the short direction of the bed surface 21 is the left-to-right direction. A mattress (not shown) is placed on the bed surface 21.

[0022] The support frame 12 supports the bed 11 and bears the load of the bed 11 and the user on the bed 11. In this embodiment, the support frame 12 supports the back bottom 16 and leg bottom 18 (movable bottom) so as to be rotatable around pivot axes 23 and 24 extending in the left-right direction, and the bed device 10 is a so-called gatch bed. The support frame 12 comprises a base frame 25, a main frame 26, and a lifting mechanism 27.

[0023] The base frame 25 is installed on the installation surface S and has a rectangular shape in plan view. As shown in Figure 3, the base frame 25 comprises a first vertical member 28 extending in the front-rear direction and a first horizontal member 29 extending in the left-right direction. The first vertical members 28 are provided in pairs, spaced apart in the left-right direction. The first horizontal member 29 is mounted on a pair of left and right first vertical members 28, connecting these two first vertical members 28 in the left-right direction. The first horizontal members 29 are provided in pairs, spaced apart in the front-rear direction. The first horizontal members 29 are fixed to the first vertical members 28 so as not to move.

[0024] The front-to-rear ends of the first vertical member 28 protrude outward in the front-to-rear direction compared to the first horizontal member 29, and mounting leg members 30 are attached to each of these ends. In the illustrated example, rubber covers are used for the leg members 30, but casters can be used instead of rubber covers.

[0025] The main frame 26 directly supports the berth 11. The main frame 26 includes a frame portion 31 that supports the berth 11 from below, and optional mounting portions 32 that protrude from the frame portion 31 in the left-right direction and are positioned below the berth 11. The frame portion 31 has a rectangular shape in plan view. The frame portion 31 includes a second vertical member 33 (vertical member) extending in the front-to-back direction and a second horizontal member 34 (supporting member) extending in the left-to-right direction.

[0026] The second vertical members 33 are provided in pairs, spaced apart in the left-right direction. The second horizontal member 34 is mounted on a pair of left and right second vertical members 33, connecting these two second vertical members 33 in the left-right direction. Multiple second horizontal members 34 are provided at intervals in the front-rear direction; in the illustrated example, there are five. The second horizontal members 34 are fixed to the second vertical members 33 so as not to move. The front-rear ends of the second vertical members 33 protrude in the front-rear direction more than the second horizontal member 34 located furthest out along the front-rear direction among the multiple second horizontal members 34.

[0027] The option mounting sections 32 are provided in pairs on the left and right sides of the frame section 31, and furthermore, A pair of option mounting sections 32 are provided, spaced apart in the front-to-back direction. Each option mounting section 32 comprises a pair of front and rear protruding members 35 extending from the second vertical member 33 in the left-to-right direction, and an option receiver 36 that is slidably mounted on both of these protruding members 35 in the left-to-right direction. The option receiver 36 protrudes from the bed 11 in the left-to-right direction. A fall prevention railing (not shown) can be attached to and detached from the option receiver 36.

[0028] The main frame 26 is divided into a head frame 37 and a foot frame 38 along the front-rear direction. In this embodiment, each pair of second longitudinal members 33 is divided into a head member 33a and a foot member 33b along the front-rear direction. The head frame 37 is formed by connecting the left and right head members 33a with two second transverse members 34 located at the head side H of a plurality of second transverse members 34. The foot frame 38 is formed by connecting the left and right foot members 33b with three second transverse members 34 located at the foot side F of a plurality of second transverse members 34. Option mounting parts 32 are arranged in pairs on the left and right sides of both the head frame 37 and the foot frame 38.

[0029] The head frame 37 is provided with a retractable frame 39 to which the back bottom 16 is fixed, and a first rotating member 43 that rotates the retractable frame 39 (back bottom 16) around the first rotation axis 23. Both the retractable frame 39 and the first rotating member 43 are formed in an inverted U shape that opens toward the head side H in a plan view. The retractable frame 39 includes a pair of bottom support parts 40 spaced apart in the left-right direction, and a connecting shaft 41 that connects the front-rear foot-side ends F of the bottom support parts 40. The left-right ends of the connecting shaft 41 protrude from the bottom support parts 40 in the left-right direction.

[0030] As shown in Figures 3 and 4, the retractable frame 39 is connected to the main frame 26 via retractable links 42. A pair of retractable links 42 are provided, sandwiching the retractable frame 39 in the left-right direction. The left-right end of a connecting shaft 41 is rotatably connected to the foot end F of each retractable link 42. The head end H of each retractable link 42 is rotatably connected to the main frame 26 via a first pivot shaft 23. The first pivot shaft 23 rotatably connects the retractable link 42 to the main frame 26.

[0031] As shown in Figures 2 to 4, the first rotating member 43 comprises a pair of left and right first push-up arm portions 43a extending in the front-rear direction along the lower surface of the back bottom 16, and a first connecting portion 43b (receiving member) connecting the pair of left and right first push-up arm portions 43a in the left-right direction. The first connecting portion 43b connects the foot-side ends F of the first push-up arm portions 43a. The left-right ends of the first connecting portion 43b protrude from the first push-up arm portions 43a in the left-right direction and are rotatably connected to the second vertical member 33. The head-side ends H of the first push-up arm portions 43a slidably abut against the lower surface of the bottom support portion 40.

[0032] In the head frame 37, the first rotating member 43 rotates upward, causing the head end H of the first pushing arm 43a to slide against the lower surface of the bottom support 40, and the first rotating member 43 pushes up the retractable frame 39. As a result, the retractable link 42 rotates around the first rotating shaft 23, and the retractable frame 39 rotates around the connecting shaft 41. As a result, as shown in Figure 2, the entire back bottom 16 moves to the head side H, and the back bottom 16 rotates up and down around the first rotating shaft 23, resulting in a so-called back-raised state in which the back bottom 16 is inclined with respect to the horizontal plane.

[0033] The raised retractable frame 39 is supported by a retractable stay 44 that extends in the front-rear direction. The retractable stay 44 is provided between the retractable frame 39 and the second lateral member 34 located at the head end H of the multiple second lateral members 34. The foot-side end F of the retractable frame 39 is rotatably connected, and the head-side end H of the retractable stay 44 is rotatably connected to the second lateral member 34. The retractable stay 44 supports the raised retractable frame 39 from diagonally below the head-side H.

[0034] As shown in Figures 3 and 4, the leg frame 38 is provided with a fixing member 45 to which the leg bottom 18 is fixed via a second pivot axis 24, and a second pivot member 46 that rotates the leg bottom 18 around the second pivot axis 24. The fixing member 45 is provided on the second transverse member 34 located furthest to the head side H among the multiple second transverse members 34 that constitute the foot-side frame 38. The fixing member 45 protrudes from the second transverse member 34 toward the foot side F. The head-side end H of the leg bottom 18 is rotatably fixed to the fixing member 45 via the second pivot shaft 24.

[0035] The second rotating member 46 is rotatably connected to the second vertical member 33 around the push-up shaft 47. A pair of push-up shafts 47 are provided, sandwiching the second rotating member 46 in the left-right direction. These two push-up shafts 47 are arranged coaxially with each other.

[0036] The second rotating member 46 is formed in an inverted U-shape that opens to the foot side F in a plan view. The second rotating member 46 comprises a pair of left and right second push-up arm portions 48 that extend in the front-rear direction along the lower surface of the leg bottom 18, and a second connecting portion 49 (receiving member) that connects the pair of left and right second push-up arm portions 48 in the left-right direction. The second connecting portion 49 connects the ends of the head side H of the pair of left and right second push-up arm portions 48. The ends of the head side H of the second push-up arm portions 48 are connected to the second vertical member 33 via a push-up shaft 47. The ends of the foot side F of the second push-up arm portions 48 slidably abut against the lower surface of the knee bottom 19.

[0037] In the foot frame 38, the second pivoting member 46 rotates upward, causing the foot end of the second pushing arm portion 48 to slide on the lower surface of the knee bottom 19, while the second pivoting member 46 pushes up the knee bottom 19. As a result, as shown in Figure 2, the knee bottom 19 rotates around the first pivot axis 23, and the foot end of the knee bottom 19 rises. Meanwhile, the foot bottom 20 rotates relatively around the flexion axis 22, resulting in a so-called leg-raising state where the portion corresponding to the knee on the bed surface 21 flexes upward.

[0038] The foot bottom 20 is provided with a foot-raising stay 50. The foot-raising stay 50 holds the foot bottom 18 in a foot-raised position. The foot bottom 18 in the foot-raised position is achieved by first raising the foot bottom 18, and then rotating the foot bottom 20 upwards around the bending axis 22. The foot-raising stay 50 extends in the front-rear direction along the lower surface of the foot bottom 20. The foot-side end F of the foot-raising stay 50 is rotatably connected to the foot bottom 20. The head-side end H of the foot-raising stay 50 is a free end. In the foot-raising stay 50, when the leg bottom 18 is in the foot-raised position, the entire foot-raising stay 50 rotates downward and extends diagonally downward from the leg bottom 20 towards the head side H, and the end of the head side H of the foot-raising stay 50 is locked to the second vertical member 33.

[0039] Here, the head end H of the waist bottom 17 is fixed to the retractable frame 39, and the foot end F of the waist bottom 17 is fixed to the fixing member 45. When the back bottom 16 moves up and down, the head end H of the waist bottom 17 moves up and down together with the back bottom 16, and the waist bottom 17 as a whole curves downwards, extending in the front-to-back direction.

[0040] In the support frame 12, the first rotating member 43 and the second rotating member 46 rotate the back bottom 16 and leg bottom 18 from the standard state described above, so that the bed 11 is in a typical usage state with the back and legs (knees) raised, as shown by the dashed line in Figure 2. When changing the bed 11 from the standard state to the usage state, the legs are raised before the back is raised, so This effectively prevents the person from shifting relative to the bed device 10.

[0041] As shown in Figures 3, 5, and 6, the lifting mechanism 27 raises and lowers the main frame 26 relative to the base frame 25. The lifting mechanism 27 employs a so-called X-link structure. The lifting mechanism 27 comprises a first link 51, a second link 52, and connecting rods 53A to 53D (receiving members). The first link 51 and the second link 52 are each provided in pairs, spaced apart in the left-right direction. Both the first link 51 and the second link 52 extend in the front-rear direction, and the central parts of the first link 51 and the second link 52 in the front-rear direction are rotatably connected via a connecting pin 54.

[0042] There are four connecting rods 53A to 53D. Each connecting rod 53A to 53D connects the front-to-back ends of each pair of left and right first links 51, and the front-to-back ends of each pair of left and right second links 52. Of the four connecting rods 53A to 53D, connecting rod 53A, which connects the head end H of the first link 51, is rotatably connected to the first vertical member 28, and connecting rod 53B (crossing rod), which connects the head end H of the second link 52, is rotatably connected to the second vertical member 33. Of the four connecting rods 53A to 53D, connecting rod 53C, which connects the foot end F of the first link 51, is mounted on an upper guide portion 55 provided on the second vertical member 33, and connecting rod 53D, which connects the foot end F of the second link 52, is mounted on a lower guide portion 56 provided on the first vertical member 28. The upper guide portion 55 and the lower guide portion 56 support the connecting rods 53C and 53D so that they can slide along the front-rear direction, respectively. Furthermore, as shown in Figure 7, in order to avoid contact with the interlocking link 63 described later, the connecting rod 53B, which is rotatably connected to the second vertical member 33, is not composed solely of a straight section 53b, but has a curved relief structure 53a in part.

[0043] In the lifting mechanism 27, when the first link 51 rotates upward, the second link 52 also rotates upward in conjunction. At this time, the foot end F of the first link 51 and the foot end F of the second link 52 are guided toward the head end H by the upper guide 55 or the lower guide 56, respectively, as the first link 51 and the second link 52 rotate, and the main frame 26 rises relative to the base frame 25.

[0044] As shown in Figures 3 and 4, the drive mechanism 13 is attached to the support frame 12 and moves the movable part 57, which is at least a part of the bed 11 and the support frame 12. The drive mechanism 13 is a linear actuator that extends and retracts in the front-rear direction and moves the movable part 57 by extending and retracting in the front-rear direction. The drive mechanism 13 includes a bottom drive mechanism 58 that rotates the back bottom 16 and leg bottom 18 (movable bottom) which are the movable part 57 in conjunction, a link drive mechanism 59 that rotates the first link 51 or the second link 52 (link) which are the movable part 57, and a back-knee bottom interlocking mechanism (bottom interlocking mechanism) 62.

[0045] In this embodiment, the bottom drive mechanism 58 is located in the head-side H portion of the support frame 12 along the front-rear direction. The bottom drive mechanism 58 extends in the front-rear direction, causing the first rotating member 43 to rotate upward. Furthermore, the power of the bottom drive mechanism 58 is supplied to the second rotating member 46 by the back-knee bottom interlocking mechanism 62, causing the second rotating member 46 to rotate upward. The bottom drive mechanism 58 is provided between the second lateral member 34 located furthest to the head-side H among the plurality of second lateral members 34 and the first connecting portion 43b. The bottom drive mechanism 58 is connected to the second lateral member 34 and the first connecting portion 43b via mounting members 60 that protrude from each of the second lateral member 34 and the first connecting portion 43b, respectively. The bottom drive mechanism 58 is rotatably connected to the mounting members 60.

[0046] The back-knee bottom linkage mechanism 62 connects the first connecting portion 43b (first rotating member 43) of the head-side frame 37 and the second connecting portion 49 (second rotating member 46) of the foot-side frame 38. As shown in Figure 7, the back-knee bottom interlocking mechanism 62 consists of an interlocking link 63 and fixing members 64a and 64b. Fixing member 64a is fixed to the first connecting portion 43b of the head-side frame 37 and protrudes upward in the standard state. Fixing member 64b is fixed to the second connecting portion 49 of the foot-side frame 38 and protrudes downward in the standard state. The interlocking link 63 is rotatably fixed to both fixing members 64a and 64b. In this embodiment, the interlocking link 63 also has a relief structure 63a that is partially curved to avoid contact with the connecting rod 53B.

[0047] The following describes the interlocking action of the back-knee bottom interlocking mechanism 62 according to this embodiment. First, when the bottom drive mechanism 58 extends in the front-rear direction from the standard state shown in Figure 7, the first connecting portion 43b (first rotating member 43) rotates via the mounting member 60. As a result, the fixed member 64a moves toward the head side H around the first connecting portion 43b together with the head side H end of the interlocking link 63, and the entire interlocking link 63 moves toward the head side H. Then, as the interlocking link 63 moves, the free end of the fixed member 64b moves toward the head side H around the second connecting portion 49 (second rotating member 46) together with the foot side F end of the interlocking link 63. As a result, the knee bottom 19 (leg bottom 18) is pushed up as shown in Figure 2. In other words, by connecting the interlocking link 63 to the first rotating member 43 and the second rotating member 46, the rotation of the first rotating member 43 and the rotation of the second rotating member 46 can be linked. Thus, in this embodiment, both the backrest 16 and the kneerest 19 can be raised simultaneously using only the power of the bottom drive mechanism 58. As a result, the user's body is supported by the kneerest 19 as the backrest is raised, reducing body displacement due to the backrest raising and alleviating the feeling of pressure.

[0048] The link drive mechanism 59 is located on the support frame 12 at the foot side F along the front-rear direction. The link drive mechanism 59 extends in the front-rear direction, causing the first link 51 to rotate upward. The link drive mechanism 59 is provided between the first link 51 and the connecting rod 53C, one of the multiple connecting rods 53A to 53D, which connects the end of the foot side F of the first link 51. The link drive mechanism 59 is connected to the connecting rod 53C via a mounting member 60 that protrudes from the connecting rod 53C. The link drive mechanism 59 is connected to the first link 51 via a conversion mechanism 61. The conversion mechanism 61 converts the extension and retraction motion of the link drive mechanism 59 into the rotational motion of the first link 51. The link drive mechanism 59 is rotatably connected to the mounting member 60 and the conversion mechanism 61.

[0049] As shown in Figures 1 to 6, the board 14 is fixed to the support frame 12 and rises above the bed surface 21. There is a pair of boards 14, one in the front and one in the back, and they rise from both ends in the front-rear direction of the second vertical member 33. The control unit 15 controls the drive mechanism 13. The control unit 15 is electrically connected to the drive mechanism 13. A power cord C and an operating unit (not shown) are electrically connected to the control unit 15. The control unit 15 is powered externally via the power cord C and receives external instructions via the operating unit. The control unit 15 controls the drive mechanism 13 based on the external instructions.

[0050] By the way, in this embodiment, we assume a bed device in which the height from the ground (installation surface) to the top surface of the bed 11 (bed surface 21) has been lowered to, for example, about 150 mm. Because the connecting rod and the interlocking link are positioned in very close proximity, when the bottom drive mechanism 58 is operated and the main frame is lowered to a low position, there is a risk that the parts where the connecting rod and the interlocking link intersect (overlapping parts) in a plan view may come into contact. On the other hand, in this embodiment, as shown in Figure 7, at the part where the interlocking link 63 and the connecting rod 53B intersect in a plan view, Both the connecting rod 53 and the interlocking link 63 have relief structures 53a, 63a that are modified to avoid contact with each other.

[0051] Specifically, as shown in Figure 7, the connecting rod 53B is composed of a straight section 53b and a relief structure 53a. The relief structure 53a is located at a position where it intersects with the interlocking link 63 in a plan view, and is a curved section (second curved section) in which a part of the connecting rod 53 is curved in a direction away from the interlocking link 63 (upward relative to the straight section 53b in the illustrated example). Therefore, even when the back-knee-bottom interlocking mechanism 62 is operated in a low-floor bed device, sufficient distance is secured between the relief structure 53a of the connecting rod 53B and the interlocking link 63, thus avoiding contact between them. Furthermore, when manufacturing the bed assembly 10, considering transportability, the frames are often assembled on-site to complete the bed assembly 10. Therefore, considering the ease of assembly of each frame, the connecting rod 53B, which is rotatably connected to the second vertical member 33 as shown in Figure 3, has a structure in which the straight section 53b and the extension of the axis of rotation relative to the second vertical member 33 are positioned on different straight lines. On the other hand, the relief structure (curved portion) 53a of the connecting rod 53B is positioned on the extension of the rotation axis of the connecting rod 53B relative to the second vertical member 33. As a result, even when the lifting mechanism 27 is operated, the relief structure (curved portion) 53a remains on the rotation axis. Therefore, there is no risk of the connecting rod 53B interfering with other members. In particular, since the lifting mechanism 27 has an X-link structure, the above configuration is especially effective when the connecting rod 53B rotates during the lifting and lowering of the main frame 26.

[0052] Furthermore, the relief structure 63a of the interlocking link 63 is provided at a position where it intersects with the connecting rod 53B in a plan view, and a part of it is a curved portion (first curved portion) that curves in a direction away from the connecting rod 53B (downward in the illustrated example). Therefore, even when the back-knee-bottom interlocking mechanism 62 is operated, sufficient distance is secured between the relief structure 63a of the interlocking link 63 and the connecting rod 53B, thus avoiding contact between them.

[0053] As described above, the bed device 10 according to this embodiment has relief structures 53a, 63a that are modified to avoid contact between the connecting rod 53 and the interlocking link 63, thereby ensuring that contact between them is avoided during the operation of both the lifting mechanism 27 and the back-knee-bottom interlocking mechanism 62. In particular, in this embodiment, since both the connecting rod 53 and the interlocking link 63, not just one of them, have relief structures 53a, 63a, contact between them can be more reliably avoided during the operation of the back-knee-bottom interlocking mechanism 62, even when the bed is lowered. Therefore, in this embodiment, even if the height from the ground to the top surface of the bed 11 is set to a height of, for example, 150 mm, there is no risk of the interlocking link 63 provided on the main frame 26 and the connecting rod 53 of the base frame 25 coming into contact during back-raising and knee-raising operations.

[0054] In the above embodiment, both the connecting rod 53B and the interlocking link 63 have relief structures 53a, 63a. However, the invention is not limited to this, and at least one of the connecting rod 53B and the interlocking link 63 may have a relief structure. However, it is preferable if both the connecting rod 53B and the interlocking link 63 have a relief structure, as this can more reliably prevent contact between the crossing rod and the interlocking link even when the back-knee bottom interlocking mechanism is operated within a low-floor bed device.

[0055] In the above embodiment, the relief structures 53a, 63a of the connecting rod 53B and the interlocking link 63 are curved. However, the present invention is not limited to this, as long as they are deformed in such a way that the distance between them increases. For example, they may be configured to increase the distance between them by deforming them at a right angle. However, from the viewpoint of ease of manufacturing, the curved portion is preferable.

[0056] Furthermore, in the above embodiment, an example was described in which the back-to-knee bottom interlocking mechanism 62 is composed of an interlocking link 63 and fixing members 64a and 64b. However, the present invention is not limited to this, as it is possible to simultaneously raise both the back of the back bottom and the knees of the knee bottom using only the power of a single drive mechanism. The present invention may be appropriately applied to any mechanism having a configuration equivalent to an interlocking link.

[0057] Furthermore, although the lifting mechanism 27 in the above embodiment has an X-link structure, the present invention is not limited thereto. The present invention may be appropriately applied to any bed device configured to lift and lower the main frame relative to the base frame.

[0058] Furthermore, in the above embodiment, a relief structure 53a is provided on the connecting rod 53B, which is rotatably connected to the second vertical member 33 that may come into contact with the interlocking link 63. However, the present invention is not limited thereto. Depending on the structure of the frame, etc., a relief structure may be appropriately provided for any member that may interfere with the interlocking link.

[0059] Furthermore, in the above embodiment, the bottom drive mechanism 58 is provided on the first rotating member 43, and the back-knee-bottom interlocking mechanism 62 is configured to transmit the rotational force of the first rotating member 43 to the second rotating member 46, but the present invention is not limited thereto. The bottom drive mechanism 58 may be provided on the second rotating member 46, and the back-knee-bottom interlocking mechanism 62 may be configured to transmit the rotational force of the second rotating member 46 to the first rotating member 43.

[0060] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0061] 10 Bed equipment 11 berths 12 Support frame 16 Back bottom 19 Knee bottoms 26 Mainframes 43 First moving member 46. ​​Second moving member 53B Connecting rod (receiving member) 53a Escape structure 53b Straight section 58 Bottom drive mechanism 63 Interlocking Links 63a Escape Structure

Claims

1. A main frame that supports the back bottom and knee bottom, A base frame that supports the main frame, The main frame is provided with a lifting mechanism that allows it to be raised and lowered, Equipped with, The interlocking link provided on the main frame and extending in the front-rear direction can be connected between the first rotating member of the main frame that rotates the back bottom and the second rotating member of the main frame that rotates the knee bottom. The first connecting rod included in the lifting device extends in the left-right direction and is rotatably connected to the main frame on a first axis. An electric bed, wherein when the interlocking link is connected between the first rotating member and the second rotating member of the main frame, the first connecting rod includes a portion that is positioned on a straight line different from the extension of the first shaft, and other portions, so that the first connecting rod avoids contact with the interlocking link.

2. The electric bed according to claim 1, wherein the lifting device includes a first link, a second link, another first link, another second link, and a linear actuator, the linear actuator being located on the foot side.

3. The electric bed according to claim 1 or claim 2, wherein the height from the installation surface of the electric bed to the upper surface of the back bottom and the knee bottom can be set to 150 mm.

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