Bed device

Abstract

To provide a bed device whose floor height is lowered and which also has an interlocking mechanism such as a back / knee bottom interlocking mechanism.SOLUTION: A bed device includes a bed having a back bottom and a knee bottom, and a support frame supporting the bed. The support frame includes: a first turning member 43 turning when raising the back of the back bottom; a second turning member turning when raising the knee of the knee bottom; an interlocking link 63 linking between the first turning member 43 and the second turning member and enabling interlock between the turn of the first turning member 43 and the turn of the second turning member; and an intersection bar 53B having a part intersecting with the interlocking link in plan view. At least either of the interlocking link 63 and the intersecting bar 53B has escape structures 53a, 63a deformed so as to avoid mutual contact at the intersecting part.SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[0002] Conventionally, the following configuration can be given as an example of a bed device to which the back-knee-bottom linkage mechanism shown in Patent Documents 1 and 2 is applied. That is, in a bed frame in which the back bottom and the knee bottom are supported so that they can be rotated and raised and lowered, an interlocking link is connected between a drive shaft that rotates the back bottom and a drive shaft that rotates the knee bottom. This allows both the back of the back bottom and the knee of the knee bottom to be raised simultaneously with a single drive source. Specifically, when power is applied from the drive source to the drive arm connected to the back bottom in order to raise the back of the back bottom, the power is applied to the interlocking link from the interlocking arm of the same drive shaft as the drive arm. Furthermore, the power is applied to the interlocking arm of the knee bottom via the interlocking link, and the knee bottom The force is applied to the push-up arm, which is on the same drive shaft as the linked arm, so that the back bottom is raised and the knee bottom is also pushed up at the same time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-240583 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-16635 Summary of the Invention [Problem to be solved by the invention]

[0004] However, for example, if the height from the ground to the top of the bed is set to approximately 150 mm for the purpose of lowering the bed height, or if the bed is located high enough above the ground but the mechanism must be housed within a space approximately 150 mm from the top of the bed, the conventional configuration requires that the interlocking link on the main frame and the cross bar constituting the lifting mechanism be located very close to each other due to space constraints. As a result, there is a risk that the interlocking link may come into contact with the cross bar or the floor when the back-knee-bottom interlocking mechanism is operating. This makes it difficult to achieve a sufficiently low bed height in conventional bed systems with back-knee-bottom interlocking mechanisms. On the other hand, in the case of bed systems with mechanical interlocking mechanisms, these components are often essential for the operation of the components. Therefore, for example, reducing the number of parts and expanding the space makes it difficult to place the back-knee-bottom interlocking mechanism inside the bed system.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a bed device that can operate linkage mechanisms such as the back-knee-bottom linkage mechanism without the components coming into contact with each other, even when the bed is made low. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. A bed device according to one embodiment of the present invention comprises a bed having a back bottom and a knee bottom, and a support stand supporting the bed, wherein the support stand comprises a first rotating member that rotates when the back of the back bottom is raised, a second rotating member that rotates when the knee of the knee bottom is raised, an interlocking link that connects the first rotating member and the second rotating member and is capable of interlocking the rotation of the first rotating member with the rotation of the second rotating member, and a cross bar having a portion that intersects with the interlocking link in a planar view, and at least one of the interlocking link and the cross bar has an escape structure that is deformed to avoid contact with each other at the intersecting portion.

[0007] According to the above aspect, both the cross bar and the interlocking link have escape structures that are modified to avoid contact with each other, so that contact with each other can be reliably avoided.

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

[0009] According to the above aspect, since both the cross bar and the interlocking link have an escape structure, contact between the cross bar and the interlocking link can be more reliably avoided even when the back-knee-bottom interlocking mechanism is operated within a low-bed bed device.

[0010] In addition, the escape structure of the interlocking link may be a first curved portion that curves in a direction away from the cross bar, and the escape structure of the cross bar may be a second curved portion that curves in a direction away from the interlocking link.

[0011] According to the above aspect, the curved portion has a shape that is easy to manufacture, making it possible to ensure a sufficient distance at the intersection between the interlocking link and the cross bar.

[0012] The support stand may further include a base frame that is placed on an installation surface, a main frame to which the bed is fixed, and a lifting mechanism that can raise and lower the main frame relative to the base frame, and the cross bar may form part of the lifting mechanism and be rotatably connected to the main frame, so that the cross bar rotates when the lifting mechanism raises and lowers the main frame.

[0013] According to the above aspect, since both the cross bar and the interlocking link have an escape structure, interference between the cross bar and the interlocking link can be avoided not only when the back-knee-bottom interlocking mechanism is operating, but also when the cross bar is rotating.

[0014] The cross bar may have a straight portion arranged in a straight line different from an extension line of the rotation axis of the cross bar relative to the main frame, and the escape structure of the cross bar may be arranged on an extension line of the rotation axis.

[0015] According to the above aspect, even when the lifting mechanism is operated, the escape structure is arranged on the rotation axis, so that the cross bar can be prevented from interfering not only with the interlocking link but also with other components. [Effects of the Invention]

[0016] According to the bed apparatus of the above aspect of the present invention, it is possible to lower the bed height and provide an interlocking mechanism. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a plan view of a bed device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the bed device shown in FIG. [Figure 3] 2 is an exploded perspective view of a support pedestal that constitutes the bed apparatus shown in FIG. 1. FIG. [Figure 4] FIG. 4 is a plan view of the support frame shown in FIG. [Figure 5] FIG. 4 is a side view of the support frame shown in FIG. 3. [Figure 6] 4 is a side view of the support cradle shown in FIG. 3, showing a state in which the main frame is raised by the lifting mechanism. FIG. [Figure 7] FIG. 2 is an enlarged perspective view illustrating the configuration of a bottom linkage mechanism and a connecting rod in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] A bed apparatus 10 according to one embodiment of the present invention will be described below with reference to the drawings. The bed apparatus 10 can be used, for example, in a medical environment (including a care environment). In Figures 1 to 6, arrow H indicates the direction that corresponds to the head side when a person (user) is sleeping, and arrow F indicates the direction that corresponds to the feet side when a person is sleeping. In the following description, the horizontal direction perpendicular to the front-to-back direction indicated by arrows H and F may be referred to as the left-to-right direction.

[0019] 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 electricity as its power source. The bed 11 is longer in the front-to-back direction than in the left-to-right direction when viewed from above. The bed 11 has a back bottom 16, a waist bottom 17, and a leg bottom 18, which are arranged in this order from the head side H to the foot side F. The leg bottom 18 has a knee bottom 19 and a foot bottom 20, which are arranged in this order from the head side H to the foot side F.

[0020] The upper surface of the back bottom 16, the upper surface of the waist bottom 17, and the upper surfaces of the leg bottoms 18 (knee bottom 19 and foot bottom 20) each form part of the bed surface 21. The back bottom 16 corresponds to the portion on the bed surface 21 that supports the back of the user, the waist bottom 17 corresponds to the portion on the bed surface 21 that supports the waist of the user, and the leg bottom 18 corresponds to the portion on the bed surface 21 that supports the legs of the user. The knee bottom 19 corresponds to the portion on the bed surface 21 that supports the knees to the waist, and the foot bottom 20 corresponds to the portion on the bed surface 21 that supports the knees to the toes of the user. The waist bottom 17 is formed to be flexible in the front-to-back direction. The knee bottom 19 and the foot bottom 20 are connected to be rotatable around a bending axis 22 that extends in the left-to-right direction.

[0021] The bed surface 21 is an orthogonal plane perpendicular to the up-down direction in the standard state before the bed 11 is deformed (for example, rotated with undulations) by the drive mechanism 13 to raise the back or knees. The bed surface 21 is formed in a rectangular shape that is longer in the front-to-back direction than in the left-to-right direction in a plan view. The longitudinal direction of the bed surface 21 (bed 11) is the front-to-back direction, and the short side 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 cradle 12 supports the bed 11 and bears the weight of the bed 11 and the user on the bed 11. In this embodiment, the support cradle 12 supports the back bottom 16 and the leg bottom 18 (movable bottom) so that they can rotate freely around rotation axes 23 and 24 extending in the left-right direction, and the bed device 10 is a so-called gatch bed. The support cradle 12 includes a base frame 25, a main frame 26, and an elevating mechanism 27.

[0023] The base frame 25 is placed on a placement surface S and has a rectangular shape in a plan view. As shown in Fig. 3, the base frame 25 includes 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 as a pair with a gap in the left-right direction. The first horizontal member 29 is installed across the pair of left and right first vertical members 28, connecting these first vertical members 28 in the left-right direction. The pair of first horizontal members 29 are provided with a gap in the front-rear direction. The first horizontal member 29 is fixed to the first vertical members 28 so as not to be able to move.

[0024] The front-rear end portions of the first vertical member 28 protrude further outward in the front-rear direction than the first horizontal member 29, and installation leg members 30 are attached to each of these end portions. In the illustrated example, rubber covers are used as the leg members 30, but casters can also be used instead of the rubber covers.

[0025] The main frame 26 directly supports the bed 11. The main frame 26 includes a frame portion 31 that supports the bed 11 from below, and an option mounting portion 32 that protrudes in the left-right direction from the frame portion 31 and is disposed below the bed 11. The frame portion 31 has a rectangular shape in a plan view and includes second vertical members 33 (vertical members) extending in the front-rear direction and second horizontal members 34 (receiving members) extending in the left-right direction.

[0026] The second vertical members 33 are provided as a pair with a gap in the left-right direction. The second horizontal member 34 is installed across a pair of left and right second vertical members 33, connecting these second vertical members 33 in the left-right direction. Multiple second horizontal members 34 (five in the illustrated example) are provided at intervals in the front-rear direction. The second horizontal members 34 are fixed immovably to the second vertical members 33. The front-rear end of the second vertical member 33 protrudes in the front-rear direction further than the second horizontal member 34 that is located outermost in the front-rear direction among the multiple second horizontal members 34.

[0027] The option mounting portions 32 are provided in pairs on the left and right sides of the frame portion 31. A pair of option mounting portions 32 are provided spaced apart in the front-to-rear direction. Each option mounting portion 32 includes a pair of front and rear protruding members 35 extending in the left-to-right direction from the second vertical member 33, and an option receiver 36 attached to both of these protruding members 35 so as to be slidable in the left-to-right direction. The option receiver 36 protrudes in the left-to-right direction from the bed 11. A fence (not shown) for preventing falls can be attached and detached to the option receiver 36.

[0028] The main frame 26 is divided into two parts along the front-rear direction: a head-side frame 37 and a foot-side frame 38. In this embodiment, each of the pair of second vertical members 33 is divided into two parts along the front-rear direction: a head-side member 33a and a foot-side member 33b. The pair of left and right head-side members 33a are connected by two of the multiple second horizontal members 34 that are located on the head side H, thereby forming the head-side frame 37. The pair of left and right foot-side members 33b are connected by three of the multiple second horizontal members 34 that are located on the foot side F, thereby forming the foot-side frame 38. A pair of left and right optional attachment portions 32 is provided on each of the head-side frame 37 and the foot-side frame 38.

[0029] The head-side 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 rotating shaft 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 ends of the bottom support parts 40 on the foot side F in the front-to-rear direction. The left and right ends of the connecting shaft 41 protrude from the bottom support parts 40 in the left-to-right direction.

[0030] As shown in Figures 3 and 4, the retractor frame 39 is connected to the main frame 26 via retractor links 42. A pair of retractor links 42 are provided, sandwiching the retractor frame 39 in the left-right direction. The left-right ends of the connecting shafts 41 are rotatably connected to the foot-side F ends of each retractor link 42. The head-side H ends of each retractor link 42 are rotatably connected to the main frame 26 via the first rotating shafts 23. The first rotating shafts 23 rotatably connect the retractor links 42 to the main frame 26.

[0031] 2 to 4, the first rotating member 43 includes a pair of left and right first push-up arms 43a extending in the front-to-rear direction along the underside of the back bottom 16, and a first connecting portion 43b (receiving member) that connects the pair of left and right first push-up arms 43a in the left-to-right direction. The first connecting portion 43b connects the foot-side F ends of the first push-up arms 43a. The left and right ends of the first connecting portion 43b protrude in the left-to-right direction from the first push-up arms 43a and are rotatably connected to the second vertical member 33. The head-side H end of the first push-up arm 43a slidably abuts the underside of the bottom support part 40.

[0032] In the head-side frame 37, as the first rotating member 43 rotates upward, the end of the first push-up arm 43a on the head side H slides against the underside of the bottom support part 40, and the first rotating member 43 pushes up the retractor frame 39. Then, the retractor link 42 rotates about the first rotating shaft 23, and the retractor frame 39 rotates about the connecting shaft 41. As a result, as shown in FIG. 2, the entire back bottom 16 moves toward the head side H, while the back bottom 16 rotates up and down about the first rotating shaft 23, and the back bottom 16 is inclined relative to the horizontal plane, resulting in a so-called back-raised state.

[0033] The retractable frame 39 in the back-raised state is supported by a retractable stay 44 extending in the front-rear direction. The retractable stay 44 is provided between the retractable frame 39 and the second horizontal member 34 located closest to the head side H among the plurality of second horizontal members 34. The end of the retractor stay 44 on the foot side F is rotatably connected to the retractor frame 39, and the end of the retractor stay 44 on the head side H is rotatably connected to the second horizontal member 34. The retractor stay 44 supports the retractor frame 39 in the back-raised state from diagonally below the head side H.

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

[0035] The second rotating member 46 is connected to the second vertical member 33 so as to be rotatable about a push-up shaft 47. A pair of push-up shafts 47 are provided on either side of the second rotating member 46 in the left-right direction. These 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 on the foot side F in a plan view. The second rotating member 46 is equipped with a pair of left and right second push-up arms 48 that extend in the front-to-rear direction along the underside of the leg bottom 18, and a second connecting part 49 (receiving member) that connects the pair of left and right second push-up arms 48 in the left-to-right direction. The second connecting part 49 connects the head-side H ends of the pair of left and right second push-up arms 48 to each other. The head-side H ends of the second push-up arms 48 are connected to the second vertical member 33 via a push-up shaft 47. The foot-side F ends of the second push-up arms 48 slidably abut the underside of the knee bottom 19.

[0037] In the foot-side frame 38, as the second rotating member 46 rotates upward, the foot-side F end of the second push-up arm 48 slides on the underside of the knee bottom 19, and the second rotating member 46 pushes up the knee bottom 19. Then, as shown in Fig. 2, the knee bottom 19 rotates about the first rotating shaft 23, and the foot-side F end of the knee bottom 19 rises. Meanwhile, the foot bottom 20 rotates relatively about the bending axis 22, and the portion of the bed surface 21 corresponding to the knee bends upward, resulting in a so-called leg-raised state.

[0038] The foot bottom 20 is provided with a toe-raising stay 50. The toe-raising stay 50 holds the leg bottom 18 in a toe-raised state. The leg bottom 18 in the toe-raised state is achieved by rotating the foot bottom 20 upward around the bending axis 22 after the leg bottom 18 is placed in the leg-raised state. The toe-raising stay 50 extends in the front-to-rear direction along the underside of the foot bottom 20. The end of the toe-raising stay 50 on the foot side F is rotatably connected to the foot bottom 20. The end of the toe-raising stay 50 on the head side H is a free end. In the toe-raising stay 50, when the leg bottom 18 is in the toe-raising state, the entire toe-raising stay 50 rotates downward and extends diagonally downward from the foot bottom 20 toward the head side H, and the end of the toe-raising stay 50 on the head side H is engaged with the second vertical member 33.

[0039] Here, the end portion on the head side H of the lumbar bottom 17 is fixed to the retractor frame 39, and the end portion on the foot side F of the lumbar bottom 17 is fixed to the fixing member 45. When the back bottom 16 rises and rotates, the end portion on the head side H of the lumbar bottom 17 rises and falls together with the back bottom 16, and the lumbar bottom 17 as a whole curves downward while extending in the front-to-back direction.

[0040] In the support cradle 12, the first rotating member 43 and the second rotating member 46 rotate the back bottom 16 and the leg bottom 18 from the standard state described above, so that the bed 11 is brought into a typical use state in which the back and legs (knees) are raised, as shown by the two-dot chain line in Fig. 2. When the bed 11 is brought from the standard state to the use state, the legs are raised before the back is raised, so that the use state This can effectively prevent the patient from slipping off the bed apparatus 10.

[0041] 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 includes 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 provided as a pair with a gap in the left-right direction. Both the first link 51 and the second link 52 extend in the front-rear direction, and the central portions of the first link 51 and the second link 52 in the front-rear direction are rotatably connected to each other via a connecting pin 54.

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

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

[0044] 3 and 4, the drive mechanism 13 is attached to the support cradle 12 and moves a movable section 57, which is at least a part of the bed 11 and the support cradle 12. The drive mechanism 13 is a linear actuator that expands and contracts in the front-to-rear direction, and moves the movable section 57 by expanding and contracting in the front-to-rear direction. The drive mechanism 13 includes a bottom drive mechanism 58 that interlocks and rotates the back bottom section 16 and leg bottom section 18 (movable bottoms) that serve as the movable section 57, a link drive mechanism 59 that rotates the first link 51 or the second link 52 (link) that serves as the movable section 57, and a back-knee bottom interlocking mechanism (bottom interlocking mechanism) 62.

[0045] In this embodiment, the bottom drive mechanism 58 is disposed in a portion of the support cradle 12 located on the head side H in the front-to-rear direction. The bottom drive mechanism 58 extends in the front-to-rear direction to rotate the first rotating member 43 upward. Furthermore, the power of the bottom drive mechanism 58 is imparted to the second rotating member 46 by a back-knee-bottom linkage mechanism 62, causing the second rotating member 46 to rotate upward. The bottom drive mechanism 58 is disposed between the second horizontal member 34 located furthest to the head side H among the multiple second horizontal members 34 and the first connecting portion 43b. The bottom drive mechanism 58 is connected to the second horizontal member 34 and the first connecting portion 43b via attachment members 60 protruding from each of the second horizontal member 34 and the first connecting portion 43b. The bottom drive mechanism 58 is rotatably connected to the attachment member 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 ) of the foot-side frame . As shown in FIG. 7, the back-knee-bottom interlocking mechanism 62 is composed of an interlocking link 63 and fixed members 64a and 64b. The fixed member 64a is fixed to the first connecting portion 43b of the head-side frame 37 and protrudes upward in the standard state. The fixed 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 the fixed members 64a and 64b. In this embodiment, the interlocking link 63 also has a partially curved relief structure 63a to avoid contact with the connecting rod 53B.

[0047] The interlocking action of the back-knee-bottom interlocking mechanism 62 according to this embodiment will be described below. First, when the bottom drive mechanism 58 is extended in the front-to-rear direction from the standard state shown in FIG. 7, the first connecting portion 43b (first rotating member 43) rotates via the attachment 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, due to the movement of the interlocking link 63, 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 FIG. 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. In this way, in this embodiment, both the back lifting of the back bottom 16 and the knee lifting of the knee bottom 19 can be performed simultaneously using only the power of the bottom drive mechanism 58. As a result, the user's body is supported by the knee bottom 19 while the back lifting progresses, which reduces the body displacement caused by the back lifting and alleviates the feeling of pressure.

[0048] The link drive mechanism 59 is disposed in a portion of the support frame 12 located on the foot side F in the front-rear direction. The link drive mechanism 59 rotates the first link 51 upward by extending in the front-rear direction. The link drive mechanism 59 is provided between the first link 51 and a connecting rod 53C, one of the multiple connecting rods 53A to 53D, which connects the end of the first link 51 on the foot side F. The link drive mechanism 59 is connected to the connecting rod 53C via an attachment member 60 protruding 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 / contraction movement of the link drive mechanism 59 into the rotational movement of the first link 51. The link drive mechanism 59 is rotatably connected to the attachment member 60 and the conversion mechanism 61.

[0049] 1 to 6, the board 14 is fixed to the support cradle 12 and stands above the bed surface 21. A pair of boards 14 are provided, one at the front and one at the rear, and stand upright from both ends of the second vertical member 33 in the front-rear direction. 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 operation unit (not shown) are electrically connected to the control unit 15. Power is supplied to the control unit 15 from the outside via the power cord C, and instructions from the outside are input to the control unit 15 via the operation unit. The control unit 15 controls the drive mechanism 13 based on instructions from the outside.

[0050] In this embodiment, a bed device is assumed in which the height from the ground (installation surface) to the upper surface (bed surface 21) of the bed 11 is lowered to, for example, about 150 mm. Since the connecting rod and the interlocking link are arranged in extremely close positions, when the bottom drive mechanism 58 is operated and the main frame is lowered to a low position, there is a risk that the intersecting portion (overlapping portion) of the connecting rod and the interlocking link may come into contact with each other in a plan view. On the other hand, in this embodiment, as shown in FIG. 7, the interlocking link 63 and the connecting rod 53B intersect in a plan view, and the interlocking link 63 and the connecting rod 53B are arranged in a plan view. Both the connecting rod 53 and the interlocking link 63 have escape structures 53a, 63a that are modified to avoid contact with each other.

[0051] 7, the connecting rod 53B is composed of a straight portion 53b and an escape structure 53a. The escape structure 53a is provided at a position that intersects with the interlocking link 63 in a plan view, and is a curved portion (second curved portion) 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 portion 53b in the illustrated example). Therefore, even when the back-knee-bottom interlocking mechanism 62 is operated on a low-bed bed device, a sufficient distance is ensured between the escape structure 53a of the connecting rod 53B and the interlocking link 63, so that contact therebetween can be avoided. Furthermore, when manufacturing the bed device 10, in consideration of portability, the frames are often assembled on-site to complete the bed device 10. Therefore, in consideration of the workability when assembling the frames, the connecting rod 53B rotatably connected to the second vertical member 33 as shown in Fig. 3 has a structure in which the straight portion 53b and the extension line of the rotation axis relative to the second vertical member 33 are arranged on different straight lines. On the other hand, the relief structure (curved portion) 53a of the connecting rod 53B is disposed on an extension line 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 is disposed on the rotation axis. Therefore, there is no risk of the connecting rod 53B interfering with other members. In particular, in this embodiment, since the lifting mechanism 27 has an X-link structure, the above configuration is particularly effective when the connecting rod 53B rotates when the main frame 26 is raised or lowered.

[0052] Furthermore, the relief structure 63a of the interlocking link 63 is provided at a position that intersects with the connecting rod 53B in a plan view, and a part of it is a curved portion (first curved portion) that is curved 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, a sufficient distance is secured between the relief structure 63a of the interlocking link 63 and the connecting rod 53B, so that contact therebetween can be avoided.

[0053] As described above, according to the bed apparatus 10 of this embodiment, the connecting rod 53 and the interlocking link 63 have escape structures 53a, 63a that have been modified to prevent them from coming into contact with each other, thereby reliably preventing them from coming into contact with each other 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, rather than just one of them, have escape structures 53a, 63a, they can be more reliably prevented from coming into contact with each other 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, for example, about 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 with each other during back-raising and knee-raising operations.

[0054] In the above embodiment, both the connecting rod 53B and the interlocking link 63 have the relief structures 53a, 63a. However, this is not limited to this, and at least one of the connecting rod 53B and the interlocking link 63 may have the relief structure. However, if both the connecting rod 53B and the interlocking link 63 have the relief structure, it is preferable because contact between the cross rod and the interlocking link can be more reliably avoided even when the back-knee-bottom interlocking mechanism is operated in a low-bed 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 so as to increase the distance between them. For example, they may be deformed at a right angle to increase the distance between them. However, from the viewpoint of ease of manufacturing, curved portions are preferable.

[0056] In the above embodiment, the back-knee-bottom linkage mechanism 62 is described as being composed of the linkage link 63 and the fixed members 64a and 64b. However, the present invention is not limited to this as long 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 also be applied as appropriate to a mechanism having a configuration equivalent to the linkage link.

[0057] In addition, in the above embodiment, the lifting mechanism 27 has an X-link structure, but the present invention is not limited to this. 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] In the above embodiment, the connecting rod 53B, which is rotatably connected to the second vertical member 33 that may come into contact with the interlocking link 63, is provided with the relief structure 53a, but the present invention is not limited to this. Depending on the structure of the frame, etc., an relief structure may be provided as appropriate for a member that may interfere with the interlocking link.

[0059] In addition, in the above embodiment, the bottom drive mechanism 58 is provided on the first rotating member 43, and the back-knee-bottom linkage 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 to this. The bottom drive mechanism 58 may be provided on the second rotating member 46, and the back-knee-bottom linkage mechanism 62 may be configured to transmit the rotational force of the second rotating member 46 to the first rotating member 43.

[0060] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0061] 10 Bed Device 11 berths 12 Support stand 16 Back Bottom 19 Knee Bottoms 26 Mainframe 43 First rotating member 46 Second rotating member 53B connecting rod (receiving member) 53a Relief structure 53b Straight section 58 Bottom drive mechanism 63 Supported Links 63a Relief structure

Claims

1. A main frame supporting the back bottom and the knee bottom; a base frame supporting the main frame; a lifting mechanism capable of lifting and lowering the main frame; Equipped with The interlocking link provided on the main frame and extending in the front-rear direction can be connected between a first rotating member of the main frame that rotates the back bottom and a second rotating member of the main frame that rotates the knee bottom, the lifting mechanism includes a first link, a second link, another first link, another second link, and a first connecting rod; the first link, the second link, the another first link, and the another second link extend in a front-to-rear direction, the first connecting rod extends in the left-right direction and is rotatably connectable to the main frame about a first axis; An electric bed, wherein the first connecting rod includes a first portion arranged on a straight line different from the extension line of the first axis, and a second portion arranged on a straight line different from the first portion, so that the first connecting rod avoids contact with the interlocking link when the interlocking link is connected between the first rotating member and the second rotating member of the main frame.

2. The electric bed according to claim 1 , wherein the second portion is disposed on an extension of the first axis.

3. 3. The electric bed according to claim 1, wherein the first connecting rod has a curved portion between the first portion and the second portion.

4. The electric bed according to any one of claims 1 to 3, wherein the height from the installation surface of the electric bed to the top surfaces of the back bottom and knee bottom can be set to 150 mm.

Images