Hip replacement postoperative rehabilitation chair with adjustable sitting posture angle

Abstract

The utility model discloses a hip replacement post-operation rehabilitation chair with an adjustable sitting posture angle, which comprises a long lying plate, a middle lying plate, a short lying plate, an armrest frame and a sliding frame, the long lying plate is hinged with the front side of the middle lying plate, the short lying plate is hinged with the front side of the middle lying plate, and the sliding frame is hinged with the rear side of the middle lying plate. The short lying plate is hinged to the rear side of the middle lying plate, the two sides of the front portion of the long lying plate are rotationally connected with the armrest frame, the short lying plate is fixedly arranged on the sliding frame, and a handle belt is arranged on the side, close to the long lying plate, of the middle lying plate. The long lying plate and the middle lying plate are folded in half by lifting the handle belt, and the short lying plate slides into the armrest frame under the pulling of the middle lying plate, so that the accompanying chair is folded. The multifunctional accompanying chair is diversified in function, can be used as an accompanying chair mode, can also be used as an accompanying bed mode, and can also be used as a rehabilitation chair mode after hip replacement.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a post-operative rehabilitation chair for hip replacement with adjustable sitting angle. Background Art

[0002] Total hip replacement (THR) originated in the 1950s and was first performed by Dr. Charnley in the UK. The use of artificial hip joints to replace severely painful hip joints has mature surgical techniques and good results, and is hailed as one of the important milestones in the development of orthopedics in the 20th century. Millions of patients undergo hip replacement surgery every year. Clinically, it has been found that after THR, when the patient's condition is stable, a high and low sofa chair for hip replacement patients should be used to assist the patient to adopt a semi-sitting position as soon as possible, improve the comfort of the sitting position, shorten the patient's recovery process, and prevent postoperative complications. Wards that generally allow are equipped with accompanying beds and chairs. Hip replacement patients' high and low sofa chairs and accompanying beds and chairs occupy a large area. Generally, the space in wards is limited, which can easily cause congestion in hospital corridors, bring inconvenience to other people's movements, and also greatly affect the image of the hospital. Utility Model Content

[0003] The technical problem to be solved by the embodiment of the utility model is to provide a post-operative rehabilitation chair for hip replacement with adjustable sitting angle, which has diversified functions and can be used as a post-operative rehabilitation chair for hip replacement, as a nursing chair mode, and as a nursing bed mode.

[0004] To achieve the above-mentioned purpose, the utility model discloses a post-operative rehabilitation chair for hip replacement with adjustable sitting angle, comprising a long reclining board, a middle reclining board, a short reclining board, an armrest frame, and a sliding frame, wherein the long reclining board is hinged to the front side of the middle reclining board, the short reclining board is hinged to the rear side of the middle reclining board, the capital sides of the long reclining board are rotatably connected to the armrest frame, the short reclining board is fixedly arranged on the sliding frame, and a handle belt is arranged on one side of the middle reclining board adjacent to the long reclining board. By lifting the handle belt, the long reclining board and the middle reclining board are folded in half, and the short reclining board slides into the armrest frame (4) when the middle reclining board is pulled, so as to be folded into a companion chair.

[0005] Among them, a sitting posture adjustment component is arranged on the short lying board, and the sitting posture adjustment component includes a first adjustment plate and a second adjustment plate. A pair of mounting grooves are provided in the middle of the rear side of the short lying board. The first adjustment plate and the second adjustment plate are arranged in parallel and are rotatably connected to the mounting grooves respectively. An angle limiting component is respectively arranged on the top surface of the short lying board corresponding to the first adjustment plate and the second adjustment plate, so that the angle limiting component can limit the rotation angle of the first adjustment plate or the second adjustment plate.

[0006] Furthermore, the angle limit assembly includes an upper cover, a lower cover, a pawl, and a turntable. The upper cover is arranged on the lower cover, and the lower cover is fixedly connected to the short lying plate. A gear is arranged between the upper cover and the lower cover so that the gear is fixedly connected to the rotating shaft of the first adjustment plate / the second adjustment plate. The pawls are a pair and are symmetrically arranged on both sides of the gear, and one side of the pawl has teeth meshing with the gear. A connecting rod mechanism is arranged between the pawls. The turntable is rotatably arranged on the upper cover and is linked to the connecting rod mechanism. The turntable is rotated to link the pawls to move closer or farther.

[0007] Furthermore, the connecting rod mechanism includes a sliding rod, a first connecting rod, and a second connecting rod. A sliding groove is arranged on the upper cover, and the sliding rod is slidably arranged on the sliding groove. One end of the first connecting rod and the second connecting rod is hinged to the sliding rod, and the other end of the first connecting rod and the second connecting rod is hinged to the shaft rod of the pawl, and an arc groove is provided on the turntable, and the end of the sliding rod extends out of the sliding groove and slides in cooperation with the arc groove.

[0008] Furthermore, a pair of guide grooves are provided on the upper cover, and the shaft of the pawl is slidably matched with the guide grooves.

[0009] Furthermore, a first elastic component is arranged between the pawl and the lower cover, and a second elastic component is arranged between the rotating disk and the upper cover.

[0010] Furthermore, the armrest frame includes a first guardrail and a second guardrail, the first guardrail and the second guardrail are respectively arranged on both sides of the long lying board, and a cross beam is arranged between the first guardrail and the second guardrail, and a plurality of limit rods are arranged at intervals along the length direction on the opposite surface of the support rod to support the bottom surface of the long lying board.

[0011] Furthermore, the first guardrail and the second guardrail each include a handrail and a support tube, the handrail is a U-shaped structure, the support tubes are a pair and are symmetrically arranged below the handrail, a support rod is arranged between the upper parts of the support tubes, and the handrail is slidably inserted on the support tubes;

[0012] A plurality of height adjustment holes are arranged at intervals along the height direction on the support tube, and a plurality of through holes corresponding to the height adjustment holes are arranged on both sides of the handrail.

[0013] Furthermore, the long lying board, the middle lying board and the short lying board are respectively provided with first cushions, and the first adjusting board and the second adjusting board are respectively provided with second cushions, and the second cushions on the first adjusting board and the second adjusting board are connected to the first cushion on the short lying board.

[0014] Furthermore, it also includes a dining board, both ends of which have slots matching the cross-sectional profile of the armrest, and the bottom of the sliding frame has a storage rack for accommodating the dining board.

[0015] Furthermore, a support assembly is arranged between the long lying board and the lower part of the middle lying board, and the support assembly includes a first leg and a second leg, the first leg is hinged to the middle part of the second leg, and the top of the first leg is hinged to the bottom surface of the long lying board, and the top of the second leg is hinged to the bottom surface of the middle lying board.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) The utility model can adjust the angle between the first adjustment plate 61 or the second adjustment plate 62 and the short lying board 3 according to the position of the affected limb or the operated limb of the patient undergoing hip replacement, so as to facilitate the placement of the affected limb of the patient after hip replacement surgery and avoid hip flexion greater than 90°, which may cause complications such as prosthesis dislocation. (2) It has diversified functions and can be used as a nursing chair mode or a nursing bed mode. It can also be used as a rehabilitation chair mode after hip replacement surgery. It is easy to fold and store, and one chair can be used for multiple purposes, which saves space, standardizes the space utilization in the ward, and is easy to manage. (3) It is equipped with two liftable armrests, which can be raised and lowered according to the height of the sitting posture, making it convenient to sit on the chair with the support of the upper limbs, and also convenient for the upper limbs to support the body's strength when getting up, reducing the weight on the affected limbs. (4) It is equipped with a detachable dining board, which can be fixed between the two armrests, which is convenient for patients to eat or read books and other activities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a top view of the overall structure of the accompanying bed model;

[0019] Figure 2 This is the main view of the overall structure of the accompanying bed mode;

[0020] Figure 3 It is a side view of the overall structure of the accompanying chair model;

[0021] Figure 4 It is the overall structure main view I of the accompanying chair mode;

[0022] Figure 5 The overall structure main view II of the accompanying chair model;

[0023] Figure 6 It is a top view of the overall structure of the accompanying chair model;

[0024] Figure 7 To show Figure 4 Schematic diagram of the structure of part A in FIG.

[0025] Figure 8 It is a perspective view of the overall structure of the angle limit assembly;

[0026] Fig. 9 It is a schematic diagram of the overall structure of the angle limit assembly. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0028] Reference Figure 1 , Figure 2 As shown, a postoperative rehabilitation chair for hip replacement with adjustable sitting angle includes a long reclining board 1, a middle reclining board 2, a short reclining board 3, an armrest frame 4, and a sliding frame 5. The long reclining board 1 is hinged to the front side of the middle reclining board 2, the short reclining board 3 is hinged to the rear side of the middle reclining board 2, both sides of the capital of the long reclining board 1 are rotatably connected to the armrest frame 4, and the short reclining board 3 is fixedly arranged on the sliding frame 5.

[0029] Reference Figure 1 , Figure 3 As shown, in this embodiment, a handle strap 21 is provided on one side of the middle lying board 2 adjacent to the long lying board 1, and the long lying board 1 and the middle lying board 2 are folded in half by the user lifting the handle strap 21, and the short lying board 3 slides into the armrest frame 4 together with the sliding frame 5 under the pull of the middle lying board 2, so as to be folded into a state where people can sit on it.

[0030] Reference Figure 1 , Figure 2 As shown, the armrest frame 4 includes a first guardrail 41 and a second guardrail 41A, the first guardrail 41 and the second guardrail 41A are respectively arranged on both sides of the long reclining board 1, and a crossbeam 42 is arranged between the first guardrail 41 and the second guardrail 41A, and a plurality of limit rods are arranged at intervals along the length direction on the opposite surface of the support rod 43, which are used to resist the bottom surface of the long reclining board 1, so that the short reclining board 3 is pulled to slide along the length direction to unfold the middle reclining board 2 and the long reclining board 1, and the two sides of the bottom surface of the long reclining board 1 are resisted by a plurality of limit rods, so that the long reclining board 4 is kept horizontal under the support of the armrest frame 4, so as to be folded into a state where a person can lie flat. It can be seen that the utility model has diversified functions, and can be used as a companion chair mode or a companion bed mode. It is easy to fold and store, and one chair can be used for multiple purposes, saving space, standardizing the space utilization in the ward, and facilitating management.

[0031] In addition, a support assembly 10 is arranged between the bottom of the long lying board 1 and the middle lying board 2, and the support assembly 10 includes a first leg 101 and a second leg 102. The middle parts of the first leg 101 and the second leg 102 are hinged, and the top of the first leg 101 is hinged to the bottom surface of the long lying board 1, and the top of the second leg 102 is hinged to the bottom surface of the middle lying board 2. When the long lying board 1 and the middle lying board 2 are unfolded in the horizontal direction, the first leg and the second leg 102 are in an X shape to support the long lying board 1 and the middle lying board 2. When the long lying board 1 and the middle lying board 2 are folded, the first leg 101 and the second leg 102 are closed and hidden between the long lying board 1 and the middle lying board 2.

[0032] Reference Figure 1 , Figure 4 As shown, it is more preferable that a sitting posture adjustment component 6 is provided on the short lying board 3, and the sitting posture adjustment component 6 includes a first adjustment plate 61 and a second adjustment plate 62. A pair of mounting grooves 31 are provided in the middle of the rear side of the short lying board 3. The first adjustment plate 61 and the second adjustment plate 62 are arranged in parallel and are rotatably connected to the mounting grooves 31 respectively, so that the first adjustment plate 61 and the second adjustment plate 62 can swing up and down.

[0033] In order to facilitate the adjustment of the swing angle of the first adjustment plate 61 or the second adjustment plate 62, the top surface of the short lying plate 3 is respectively provided with an angle limiting component 7 corresponding to the first adjustment plate 61 and the second adjustment plate 62, so that the angle limiting component 7 can limit the rotation angle of the first adjustment plate 61 or the second adjustment plate 62.

[0034] Combination Figure 7-Figure 9 As shown, specifically, the angle limit assembly 7 includes an upper cover 71, a lower cover 72, a pawl 73, and a rotating disk 74. The upper cover 71 is arranged on the lower cover 72, and the lower cover 72 is fixedly connected to the short lying plate 3. A gear 75 is arranged between the upper cover 71 and the lower cover 72. In this embodiment, both sides of the first adjustment plate 61 / the second adjustment plate 62 have a rotating shaft so that the first adjustment plate 61 and the second adjustment plate 62 are respectively pivotally connected to the mounting slot 31, and one of the rotating shafts of the first adjustment plate 61 / the second adjustment plate 62 extends into the short lying plate 31. The shaft hole of the lower cover is fixedly connected to the gear 75 so that the gear 75 rotates with the swing of the first adjustment plate 61 / the second adjustment plate 62. The ratchet 73 is a pair and is symmetrically pivoted to the two sides of the gear 75, and one side of the ratchet 73 has teeth meshing with the gear 75, and a connecting rod mechanism 76 is arranged between the ratchet pawls 73. The turntable 74 is rotatably arranged on the upper cover 71 and is linked to the connecting rod mechanism 76. The turntable 74 is rotated to make the ratchet pawls 73 move closer or farther.

[0035] In this embodiment, the connecting rod mechanism 76 includes a sliding rod 761, a first connecting rod 762, and a second connecting rod 763. A sliding groove 711 is provided on the upper cover 71. The sliding rod 761 is slidably set on the sliding groove 711. One end of the first connecting rod 762 and the second connecting rod 763 is hinged to the sliding rod 761, and the lower part of the pawl 73 has an axle rod 731, so that the other end of the first connecting rod 762 and the second connecting rod 763 is hinged to the axle rod 731 of the pawl 73, and an arc groove 741 is provided on the turntable 74, and the end of the sliding rod 761 extends out of the sliding groove 711 and slides with the arc groove 741, and a handle 742 is fixedly provided on the turntable 74.

[0036] A pair of guide grooves 712 are provided on the upper cover 71, and the shaft of the pawl 73 slides in the guide groove 712 to limit the distance of the pawls 73 moving toward or away from each other, and a first elastic component is provided between the pawl 73 and the lower cover 72. In this embodiment, the first elastic component is preferably a torsion spring so that the pawl 73 engages with the gear 75 under the elastic action of the first elastic component.

[0037] A second elastic component is provided between the turntable 74 and the upper cover 71. In this embodiment, the second elastic component is preferably a spiral spring, so that the turntable 74 can prevent the slide bar 761 from moving downward under the elastic force of the second elastic component, so that the pawl 73 and the gear 75 can be tightly engaged to prevent the gear from rotating.

[0038] When it is necessary to adjust the angle of the first adjustment plate 61 / the second adjustment plate 62, the handle 742 is turned to make the turntable 74 overcome the resistance of the second elastic component and rotate counterclockwise, so that the slide rod 761 moves downward along the slide groove 711 under the guidance of the arc groove 741 on the turntable 74, thereby linking the ratchet 73 to move apart through the first connecting rod 762 and the second connecting rod 763, so that the ratchet 73 overcomes the resistance of the first elastic component and no longer meshes with the gear 75, thereby rotating the first adjustment plate 61 / the second adjustment plate 62 downward, thereby adjusting the angle of the first adjustment plate 61 / the second adjustment plate 62.

[0039] When the first adjustment plate 61 / the second adjustment plate 62 is adjusted to a suitable angle, the handle 742 on the turntable 74 is loosened, so that the turntable 74 is elastically reset under the action of the second elastic component (that is, the turntable returns to its original position in the clockwise direction under the elastic force), and the slide rod 761 moves up along the slide groove 711 under the guidance of the arc groove 741, thereby linking the pawl 73 to move similarly through the first connecting rod 762 and the second connecting rod 763, so that the pawl 73 is tightly engaged with the gear 75 under the elastic force of the first elastic component, thereby using the pawl 73 to lock the gear 75 to prevent the first adjustment plate 61 / the second adjustment plate 62 from rotating.

[0040] Through the above arrangement, the angle between the first adjustment plate 61 or the second adjustment plate 62 and the short lying board 3 can be adjusted according to the position of the affected limb or the limb on the surgical side of the hip replacement patient, so that when the hip replacement patient sits on the short lying board 3, the first adjustment plate 61 or the second adjustment plate 62 with the adjusted angle can ensure that the knee joint of the affected limb is lower than the hip, avoiding the hip flexion greater than 90°, causing complications such as prosthesis dislocation, thereby improving the sitting comfort of the affected limb and shortening the rehabilitation process of the affected limb. And the first adjustment plate and the second adjustment plate are adjusted to be flush with the short lying board, so that accompanying family members or visitors can sit comfortably.

[0041] Reference Figure 2 As shown, in this embodiment, the long lying board 1, the middle lying board 2, and the short lying board 3 are respectively provided with the first soft cushion 9, and the first adjustment board 61 and the second adjustment board 62 are respectively provided with the second soft cushion 9A, and the second soft cushion 9A on the first adjustment board 61 and the second adjustment board 62 is connected to the first soft cushion 9 on the short lying board 3. In this embodiment, the first soft cushion 9 and the second soft cushion 9A are made of thickened sponge material to ensure a comfortable use experience, which not only allows the accompanying family members or visitors to sit more comfortably, but also allows the accompanying family members to relax more when resting beside the bed on a daily basis.

[0042] Reference Figure 1 As shown in the figure, the first guardrail 41 and the second guardrail 41A both include armrests 411 and support tubes 412. The armrests 411 are of U-shaped structure. The support tubes 412 are a pair and are symmetrically arranged below the armrests 411. The support rods 43 are arranged between the upper parts of the support tubes 412 to improve the supporting stability of the support rods 43. The armrests 411 are slidably inserted into the support tubes 412, and a plurality of height adjustment holes 413 are arranged on the support tubes 412 at intervals along the height direction. A plurality of through holes corresponding to the height adjustment holes 413 are respectively arranged on both sides of the armrests 411. Therefore, the armrests 411 can be raised or lowered according to the height of the sitting posture, which is convenient for sitting on the chair with the support of the upper limbs, and also convenient for the upper limbs to support the body's strength when getting up, thereby reducing the weight on the affected limbs.

[0043] Reference Figure 3 , Figure 5 , Figure 6 As shown, the utility model also includes a dining board 8, both ends of which have grooves 81 matching the cross-sectional profile of the armrests 411, so that the dining board 8 can be placed between the armrests 411, which is convenient for the patient to dine or read or other activities, and the dining board 8 has a U-shaped recess 82 on the side facing the middle lying board 2, thereby increasing the space for the patient to sit, and in this embodiment, the bottom of the sliding frame 5 has a storage rack 52, when the dining board 8 is not in use, the dining board 8 can be removed and placed on the storage rack 52, thereby reducing the space occupied by the dining board.

[0044] Of course, the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical scheme of the utility model should be included in the protection scope of the utility model.

Claims

1. A post-operative rehabilitation chair for hip replacement with adjustable sitting angle, characterized in that: The invention comprises a long reclining board (1), a middle reclining board (2), a short reclining board (3), an armrest frame (4), and a sliding frame (5), wherein the long reclining board (1) is hinged to the front side of the middle reclining board (2), the short reclining board (3) is hinged to the rear side of the middle reclining board (2), both sides of the capital of the long reclining board (1) are rotatably connected to the armrest frame (4), the short reclining board (3) is fixedly arranged on the sliding frame (5), a handle belt (21) is arranged on one side of the middle reclining board (2) adjacent to the long reclining board (1), the long reclining board (1) and the middle reclining board (2) are folded in half by lifting the handle belt (21), and the short reclining board (3) slides into the armrest frame (4) under the pulling of the middle reclining board (2), thereby being folded into a companion chair; Wherein, a sitting posture adjustment component (6) is arranged on the short lying board (3), and the sitting posture adjustment component (6) includes a first adjustment plate (61) and a second adjustment plate (62). The middle part of the rear side of the short lying board (3) has a pair of mounting grooves (31), and the first adjustment plate (61) and the second adjustment plate (62) are arranged in parallel and are respectively rotatably connected to the mounting grooves (31). The top surface of the short lying board (3) is respectively provided with an angle limiting component (7) corresponding to the first adjustment plate (61) and the second adjustment plate (62), so that the angle limiting component (7) limits the rotation angle of the first adjustment plate (61) or the second adjustment plate (62).

2. A post-operative hip replacement rehabilitation chair with adjustable sitting angle according to claim 1, characterized in that: The angle limiting assembly (7) comprises an upper cover (71), a lower cover (72), a ratchet (73), and a rotating disk (74); the upper cover (71) is arranged on the lower cover (72); the lower cover (72) is fixedly connected to the short lying board (3); a gear (75) is arranged between the upper cover (71) and the lower cover (72) so that the gear (75) is fixedly connected to the rotating shaft of the first adjusting plate (61) / the second adjusting plate (62); The ratchet pawls (73) are a pair and are symmetrically arranged on both sides of the gear (75), and one side of the ratchet pawls (73) has teeth meshing with the gear (75). A connecting rod mechanism (76) is arranged between the ratchet pawls (73). The rotating disk (74) is rotatably arranged on the upper cover (71) and is linked to the connecting rod mechanism (76). The rotating disk (74) is rotated to link the ratchet pawls (73) to move closer or farther.

3. A post-hip replacement rehabilitation chair with adjustable sitting angle according to claim 2, characterized in that: The connecting rod mechanism (76) includes a sliding rod (761), a first connecting rod (762), and a second connecting rod (763). A sliding groove (711) is provided on the upper cover (71). The sliding rod (761) is slidably provided on the sliding groove (711). One end of the first connecting rod (762) and the second connecting rod (763) is hinged to the sliding rod (761). The other end of the first connecting rod (762) and the second connecting rod (763) is hinged to the shaft of the pawl (73). The turntable (74) has an arc groove (741). The end of the sliding rod (761) extends out of the sliding groove (711) and slides with the arc groove (741).

4. A post-operative rehabilitation chair for hip replacement with adjustable sitting angle according to claim 3, characterized in that: The upper cover (71) is provided with a pair of guide grooves (712), and the shaft of the ratchet (73) is slidably matched with the guide grooves (712).

5. The post-operative rehabilitation chair for hip replacement with adjustable sitting angle according to claim 3, characterized in that: A first elastic component is provided between the ratchet (73) and the lower cover (72), and a second elastic component is provided between the rotating disk (74) and the upper cover (71).

6. The post-operative rehabilitation chair for hip replacement with adjustable sitting angle according to claim 1, characterized in that: The armrest frame (4) comprises a first guardrail (41) and a second guardrail (41A), wherein the first guardrail (41) and the second guardrail (41A) are respectively arranged on both sides of the long reclining board (1), and a crossbeam (42) is arranged between the first guardrail (41) and the second guardrail (41A).

7. A post-hip replacement rehabilitation chair with adjustable sitting angle according to claim 6, characterized in that: The first guardrail (41) and the second guardrail (41A) both comprise a handrail (411) and a support tube (412); the handrail (411) is a U-shaped structure; the support tubes (412) are a pair and are symmetrically arranged below the handrail (411); a support rod (43) is arranged between the upper parts of the support tubes (412); and the handrail (411) is slidably inserted into the support tubes (412); A plurality of height adjustment holes (413) are arranged at intervals along the height direction on the support tube (412), and a plurality of through holes corresponding to the height adjustment holes (413) are respectively arranged on both sides of the handrail (411); A plurality of limit rods are arranged at intervals along the length direction on the opposite surface of the support rod (43) for supporting the bottom surface of the long lying board (1).

8. The post-operative rehabilitation chair for hip replacement with adjustable sitting angle according to claim 1, characterized in that: The long lying board (1), the middle lying board (2) and the short lying board (3) are respectively provided with a first soft pad (9), and the first adjusting board (61) and the second adjusting board (62) are respectively provided with a second soft pad (9A), and the second soft pad (9A) on the first adjusting board (61) and the second adjusting board (62) are connected to the first soft pad (9) on the short lying board (3).

9. The post-operative rehabilitation chair for hip replacement with adjustable sitting angle according to claim 7, characterized in that: It also comprises a dining board (8), both ends of which have slots (81) matching the cross-sectional profile of the armrest (411), and the bottom of the sliding frame (5) has a storage rack (52) for accommodating the dining board (8).

10. The post-operative rehabilitation chair for hip replacement with adjustable sitting angle according to claim 1, characterized in that: A support assembly (10) is arranged between the long lying board (1) and the lower part of the middle lying board (2), and the support assembly (10) includes a first leg (101) and a second leg (102), the first leg (101) and the second leg (102) are hinged between their middle parts, and the top of the first leg (101) is hinged to the bottom surface of the long lying board (1), and the top of the second leg (102) is hinged to the bottom surface of the middle lying board (2).

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