Multifunctional gynecological nursing bed

Abstract

The invention relates to the technical field of nursing beds, and discloses a multifunctional gynecological nursing bed which comprises a bed body, according to the multifunctional gynecological nursing bed, by means of the arrangement of a movable assembly, when a patient needs to get out of the bed, a driving motor is started to drive a threaded rod to rotate, and when the threaded rod rotates, a sliding block, a movable plate, a top plate and a bottom plate can be driven to slide; when the movable plate slides to drive the bottom plate to move to the right side of the bed body, the bottom plate swings downwards, so that the legs of the patient are driven to move downwards, when the movable plate drives the top plate to slide rightwards, a rotating rod and a gear are driven to slide, and when the gear slides rightwards and is meshed with the rack, the gear rotates under the action of the rack; the top plate swings upwards and supports the back of the patient, so that the patient is pushed to sit up, the situation that the waist, the back and other parts of the patient are injured due to improper force exertion when the patient suddenly gets up is prevented, the getting-up difficulty is reduced, the safety and comfort of the patient in the getting-up process are enhanced, and the rehabilitation progress of the patient is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of nursing beds, in particular to a multifunctional gynecological nursing bed. Background Art

[0002] In gynecological medical care scenarios, the patient groups often have special characteristics, such as those who have undergone gynecological surgery, are in a special stage of pregnancy, or are suffering from gynecological diseases and are receiving treatment, which makes their physical condition relatively weak and their mobility is limited to varying degrees. In the daily care process, the use of hospital beds plays a vital role in the patient's recovery and convenience of life.

[0003] However, when using the existing multifunctional gynecological nursing beds, patients mainly rely on their own strength and the assistance of nursing staff to get up from the traditional nursing beds. Due to the lack of an effective auxiliary mechanism, patients need to exert force suddenly to adjust their body posture when trying to sit up or get up, which can easily cause key parts such as the waist and back to bear greater pressure and inappropriate torque, thereby causing the risk of injury, such as lumbar muscle strain and increased back pain. Moreover, getting up suddenly may also cause postural hypotension in the body, causing uncomfortable symptoms such as dizziness and blacking out of the eyes. Especially for gynecological patients who are already physically weak, these problems are more prominent, which not only affects the patient's recovery process, but also increases the patient's safety risks. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a multifunctional gynecological nursing bed, which solves the problem that weak gynecological patients may easily suffer the risk of injury due to sudden exertion of force to adjust their body posture when getting up and out of bed.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a multifunctional gynecological nursing bed, including a bed body. A connecting frame is fixedly installed at the bottom of the bed body, and universal wheels are fixedly installed at the bottom of the connecting frame. A fence is fixedly installed on the outer side of the bed body. It further includes a moving component for moving the patient on the bed body; a moving component for supporting the patient's feet when getting up; a protection component for protecting the patient lying on the bed body. The moving component includes: a driving motor fixedly installed on the outer side of the bed body. A threaded rod is fixedly installed on the surface of the output shaft of the driving motor. A support rod is arranged on the surface of the threaded rod. The support rod is fixedly installed inside the connecting frame. The threaded rod is threadedly connected inside the support rod. A slider is threadedly connected to the surface of the threaded rod. The slider is slidably connected inside the support rod. A movable plate is fixedly installed at the bottom of the slider. One end of the movable plate is hinged to a top plate, and the other end of the movable plate is hinged to a bottom plate

[0008] Preferably, a sliding shaft is fixedly installed inside the bottom plate. The sliding shaft is rotatably connected to one end of the movable plate and penetrates through the bed body.

[0009] Preferably, a rotating rod is fixedly installed inside the top plate. The rotating rod is rotatably connected to the other end of the movable plate and penetrates through the bed body. A gear is fixedly installed on the surface of the rotating rod. A rack is fixedly installed on the outer side of the bed body. A pulley is fixedly installed at the bottom of the movable plate. The pulley is slidably connected inside the bed body.

[0010] Preferably, the moving component includes: a rotating shaft rotatably connected inside the support rod. A sliding rod is slidably connected to the surface of the rotating shaft. A telescopic plate is fixedly installed on the surface of the sliding rod. The telescopic plate is fixedly installed inside the connecting frame. A fixing spring is fixedly installed inside the telescopic plate.

[0011] Preferably, a connecting shaft is fixedly installed on the surface of the rotating shaft. The connecting shaft is rotatably connected to the surface of the connecting frame. A fixing rod is fixedly installed on the surface of the connecting shaft. A movable rod is hinged to the surface of the fixing rod. The inner side of the movable rod is hinged to a moving block. The moving block is slidably connected to the surface of the connecting frame. A ladder platform is fixedly installed at the bottom of the moving block. The ladder platform is slidably connected to the bottom of the connecting frame

[0012] Preferably, the protection component includes: a stop bar slidably connected inside the bed body. A connecting bar is fixedly installed on the outer side of the stop bar. A telescopic rod is fixedly installed on the inner side of the connecting bar. A movable spring is fixedly installed inside the telescopic rod. The telescopic rod is fixedly installed on the outer wall of the bed body

[0013] Preferably, there are two groups of the protection components, and the two groups of the protection components are symmetrically arranged with the center line of the bed body as the axis of symmetry

[0014] Preferably, a groove is provided inside the bed body, a first sliding groove is provided on the surface of the bed body, a strip-shaped groove is provided on the surface of the support rod, an arc-shaped groove is provided on the surface of the rotating shaft, and a second sliding groove is provided on the surface of the connecting frame

[0015] Preferably, the cross-section of the movable plate is H-shaped, and the cross-section of the blocking strip is rectangular

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a multifunctional gynecological nursing bed, which has the following beneficial effects

[0018] 1. For this multifunctional gynecological nursing bed, by using the setting of the movable component, when the patient needs to get out of bed, start the driving motor to drive the threaded rod to rotate. When the threaded rod rotates, it will drive the sliding of the slider, the movable plate, the top plate and the bottom plate. When the movable plate slides and drives the bottom plate to move to the right side of the bed body, the bottom plate will swing downward, thereby driving the patient's legs to move downward. When the movable plate drives the top plate to slide to the right, it will also drive the rotating rod and the gear to slide. When the gear slides to the right and meshes with the rack, the gear will rotate under the action of the rack, causing the top plate to swing upward and support the patient's back, thereby pushing the patient to sit up, preventing the patient from being injured in parts such as the waist and back due to improper sudden getting up force, reducing the difficulty of getting up, and enhancing the safety, comfort and patient recovery progress during the getting-up process

[0019] 2. For this multifunctional gynecological nursing bed, by using the setting of the moving component, when the slider slides, it will also abut against the surface of the telescopic plate. When the telescopic plate is abutted, it will drive the sliding rod to slide on the surface of the rotating shaft, causing the rotation of the rotating shaft and the fixed rod. When the fixed rod rotates, it will pull the moving block to move towards the center point of the connecting frame through the movable rod. When the moving block moves, it will drive the bottom step to move in the moving direction of the moving block, so that the step moves to the bottom of the patient's feet for support, preventing the patient from slipping or falling during the getting-up process due to insufficient leg strength or unstable body center of gravity, providing a stable and reliable foot support force for the patient, enhancing the balance and stability of the body during getting up, reducing the risk of accidents during the process of getting out of bed and getting up, and improving the convenience and safety when using the nursing bed

[0020] 3. For this multifunctional gynecological nursing bed, by using the setting of the protection component, when the patient needs to get into bed, start the driving motor, so that the movable plate drives the bottom plate to slide to the left inside the bed body and releases the abutment of the bottom plate against the blocking strip. As a result, the blocking strip will reset under the action of the movable spring arranged inside the telescopic rod, so that the blocking strip moves back to the center of the bed body for combination, preventing the patient from accidentally slipping off the bed body when resting on the bed body, enhancing the safety of the patient lying down, and avoiding secondary injuries caused by accidental rolling Description of the drawings

[0021] Figure 1 Schematic structural diagram of a multifunctional gynecological nursing bed proposed by the present invention;

[0022] Figure 2 Front view structural diagram of a multifunctional gynecological nursing bed proposed by the present invention;

[0023] Figure 3 Bottom view structural diagram of a multifunctional gynecological nursing bed proposed by the present invention;

[0024] Figure 4 Front view structural diagram of the movable component part of a multifunctional gynecological nursing bed proposed by the present invention;

[0025] Figure 5 Front view structural diagram of the movable board of a multifunctional gynecological nursing bed proposed by the present invention;

[0026] Figure 6 Front view structural diagram of the moving component part of a multifunctional gynecological nursing bed proposed by the present invention;

[0027] Figure 7 Front view structural diagram of the ladder platform of a multifunctional gynecological nursing bed proposed by the present invention;

[0028] Figure 8 Front view structural diagram of the protection component of a multifunctional gynecological nursing bed proposed by the present invention;

[0029] Figure 9 Cross-sectional structural diagram of the telescopic board of a multifunctional gynecological nursing bed proposed by the present invention;

[0030] Figure 10 Cross-sectional structural diagram of the telescopic rod of a multifunctional gynecological nursing bed proposed by the present invention.

[0031] In the figure: 1, bed body; 2, connecting frame; 3, universal wheel; 4, enclosure; 5, movable component; 6, moving component; 7, protection component; 51, driving motor; 52, threaded rod; 53, support rod; 54, slider; 55, movable board; 56, top plate; 512, bottom plate; 57, sliding shaft; 58, rotating rod; 59, gear; 510, rack; 511, pulley; 61, rotating shaft; 62, sliding rod; 63, telescopic board; 64, fixed spring; 65, connecting shaft; 66, fixed rod; 67, movable rod; 68, moving block; 69, ladder platform; 71, retaining strip; 72, connecting strip; 73, telescopic rod; 74, movable spring; 10, groove; 11, chute 1; 530, strip-shaped groove; 610, arc-shaped groove; 20, chute 2. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1-10 As shown in the figure, a multifunctional gynecological nursing bed includes a bed body 1. A connecting frame 2 is fixedly installed at the bottom of the bed body 1. A universal wheel 3 is fixedly installed at the bottom of the connecting frame 2. A fence 4 is fixedly installed on the outside of the bed body 1.

[0034] It further includes a moving component 5 for moving the patient on the bed body 1.

[0035] A moving component 6 for supporting the feet of the patient when getting up.

[0036] A protection component 7 for protecting the patient lying on the bed body 1.

[0037] First of all, the moving component 5 includes: a driving motor 51. The driving motor 51 is fixedly installed on the outside of the bed body 1. A threaded rod 52 is fixedly installed on the surface of the output shaft of the driving motor 51. A support rod 53 is arranged on the surface of the threaded rod 52. The support rod 53 is fixedly installed inside the connecting frame 2. The threaded rod 52 is threadedly connected inside the support rod 53. A slider 54 is threadedly connected to the surface of the threaded rod 52. The slider 54 is slidably connected inside the support rod 53. A movable plate 55 is fixedly installed at the bottom of the slider 54. One end of the movable plate 55 is hinged to a top plate 56, and the other end of the movable plate 55 is hinged to a bottom plate 512. The elastic rubber material of the movable plate 55, the top plate 56 and the bottom plate 512 can be used to improve the comfort of the patient lying.

[0038] Secondly, a sliding shaft 57 is fixedly installed inside the bottom plate 512. The sliding shaft 57 is rotatably connected to one end of the movable plate 55. The sliding shaft 57 penetrates the bed body 1. When the bottom plate 512 slides to the edge of the bed body 1, it can swing downward by gravity through the sliding of the sliding shaft 57.

[0039] Furthermore, a rotating rod 58 is fixedly installed inside the top plate 56. The rotating rod 58 is rotatably connected to the other end of the movable plate 55. The rotating rod 58 penetrates the bed body 1. A gear 59 is fixedly installed on the surface of the rotating rod 58. A rack 510 is fixedly installed on the outside of the bed body 1. A pulley 511 is fixedly installed at the bottom of the movable plate 55. The pulley 511 is slidably connected inside the bed body 1. The arrangement of the pulley 511 can be used to improve the smoothness of the movable plate 55 when moving.

[0040] Furthermore, the moving component 6 includes: a rotating shaft 61, which is rotatably connected to the inner side of the support rod 53, a sliding rod 62 is slidably connected to the surface of the rotating shaft 61, a telescopic plate 63 is fixedly installed on the surface of the sliding rod 62, the telescopic plate 63 is fixedly installed on the inner side of the connecting frame 2, and a fixed spring 64 is fixedly installed inside the telescopic plate 63. The fixed spring 64 arranged inside the telescopic plate 63 can achieve the effect of resetting the telescopic plate 63 after the impact is completed.

[0041] Furthermore, a connecting shaft 65 is fixedly installed on the surface of the rotating shaft 61, and the connecting shaft 65 is rotatably connected to the surface of the connecting frame 2. A fixed rod 66 is fixedly installed on the surface of the connecting shaft 65, and a movable rod 67 is hinged on the surface of the fixed rod 66. A moving block 68 is hinged on the inner side of the movable rod 67, and the moving block 68 is slidably connected to the surface of the connecting frame 2. A step 69 is fixedly installed on the bottom of the moving block 68, and the step 69 is slidably connected to the bottom of the connecting frame 2. The step 69 can support the soles of the feet, so that when the bed body 1 is too high, the ground and the patient's feet cannot fit together.

[0042] Furthermore, the protective component 7 includes: a baffle 71, which is slidably connected to the inside of the bed body 1, a connecting bar 72 is fixedly installed on the outside of the baffle 71, a telescopic rod 73 is fixedly installed on the inside of the connecting bar 72, a movable spring 74 is fixedly installed inside the telescopic rod 73, and the telescopic rod 73 is fixedly installed on the outer wall of the bed body 1. The movable spring 74 inside the telescopic rod 73 can achieve the effect of resetting after the telescopic rod 73 is extended and contracted.

[0043] Finally, two groups of protection components 7 are provided, and the two groups of protection components 7 are symmetrically arranged with the center line of the bed body 1 as the symmetry axis. A groove 10 is opened inside the bed body 1, and the groove 10 opened inside the bed body 1 can be used to facilitate the pulley 511 to slide inside the bed body 1. A slide groove 11 is opened on the surface of the bed body 1, and the slide groove 11 opened on the surface of the bed body 1 can be used to facilitate the movement of the rotating rod 58 and the sliding shaft 57 on the surface of the bed body 1. A strip groove 530 is opened on the surface of the support rod 53, and the strip groove 530 opened on the surface of the support rod 53 can be used to facilitate the connection between the sliding rod 62 and the telescopic plate 63. An arc groove 610 is opened on the surface of the rotating shaft 61, and the arc groove 610 opened on the surface of the rotating shaft 61 can be used to realize the rotation of the rotating shaft 61 when the sliding rod 62 slides. A slide groove 20 is opened on the surface of the connecting frame 2, and the slide groove 20 opened on the surface of the connecting frame 2 can be used to realize the sliding of the moving block 68 on the surface of the connecting frame 2.

[0044] The cross section of the movable plate 55 is H-shaped, and the H-shaped movable plate 55 can be used to improve the hinge effect between the movable plate 55 and the top plate 56 and the bottom plate 512. The cross section of the baffle 71 is rectangular, and the rectangular baffle 71 can be used to improve the resistance effect of the bottom plate 512 to the baffle 71.

[0045] Working principle: When the multifunctional gynecological nursing bed is in use, the patient can lie on the movable plate 55, top plate 56, and bottom plate 512 provided inside the bed body 1. The surfaces of the movable plate 55, top plate 56, and bottom plate 512 are all made of elastic rubber. When the patient needs to get out of bed, the driving motor 51 can be started to drive the threaded rod 52 to rotate inside the support rod 53. When the threaded rod 52 rotates, it will drive the slider 54 to slide inside the support rod 53. When the slider 54 slides, it will drive the sliding of the movable plate 55. When the movable plate 55 slides, it will drive the sliding of the top plate 56 and bottom plate 512 hinged on the outside. When the movable plate 55 slides, it will drive the patient to move to the right side inside the bed body 1. When the movable plate 55 drives the bottom plate 512 to move to the right side of the bed body 1, the bottom plate 512 will swing downward, thereby driving the patient's legs to move downward. When the movable plate 55 drives the top plate 56 to slide to the right side, it will also drive the sliding of the rotating rod 58. When the rotating rod 58 slides, it will drive the gear 59 on its surface to slide. When the gear 59 slides to the right and meshes with the rack 510, the gear 59 will rotate under the action of the rack 510, thereby driving the top plate 56 to swing upward outside the movable plate 55. When the top plate 56 swings upward, it will support the patient's back, thereby pushing the patient to stand up on the left, preventing the patient from being injured in the waist, back and other parts due to improper sudden getting up force, and playing the role of assisting the patient to get up smoothly, reducing the stress on the waist and back, reducing the difficulty of getting up, and ensuring the safety and comfort of the patient during the getting up process. At the same time, this gradual support and body position adjustment also helps to reduce discomfort such as dizziness that may be caused by excessive or violent getting up movements, which is more in line with the relatively weak physical characteristics of gynecological patients and improves the patient's rehabilitation progress.

[0046] When the slider 54 slides to the right under the rotation of the threaded rod 52, it will also contact the surface of the telescopic plate 63. When the telescopic plate 63 is contacted, it will contract, thereby driving the sliding rod 62 to slide on the surface of the rotating shaft 61, so as to drive the rotation of the rotating shaft 61 through the arc-shaped groove 610 opened on the surface of the rotating shaft 61. When the rotating shaft 61 rotates, it will drive the rotation of the fixed rod 66. When the fixed rod 66 rotates, it will pull the moving block 68 to move towards the center point of the connecting frame 2 through the movable rod 67. When the moving block 68 moves, it will drive the bottom trapezoid 69 to move in the moving direction of the moving block 68, so that the trapezoid 69 moves to the sole of the patient's foot for support, preventing the patient from slipping or falling during the getting-up process due to insufficient leg strength or unstable body center of gravity, playing a role in providing a stable and reliable foot support force for the patient, assisting the patient to better adjust the getting-up posture, enhancing the balance and stability of the body during getting up, enabling the patient to change from the lying state to the sitting state more safely, labor-savingly and calmly. Especially for gynecological patients who may be relatively weak and less mobile, it greatly reduces the risk of accidents during the process of getting out of bed and getting up, and improves the convenience and safety when using the nursing bed.

[0047] When the movable plate 55 drives the bottom plate 512 to slide, it will first contact the surface of the stop bar 71 and push the stop bar 71 to drive the connecting bar 72 to move away from the center point of the bed body 1. When the connecting bar 72 moves, it will drive the telescopic rod 73 to extend. When the patient needs to get into bed, the drive motor 51 is started in the reverse direction, so that the movable plate 55 drives the bottom plate 512 to slide to the left inside the bed body 1 and releases the contact of the bottom plate 512 with the stop bar 71. Thus, the stop bar 71 will reset under the action of the movable spring 74 arranged inside the telescopic rod 73, so that the stop bar 71 moves back to the center of the bed body 1 for combination, preventing the patient from accidentally slipping off the bed body 1 during rest on the bed body 1, playing the role of effectively protecting the patient and improving the lying safety of the patient. Especially for gynecological patients, they may be relatively weak, less mobile or in a special physical state after surgery, with relatively weak consciousness and limb control ability. This protective effect of the stop bar 71 can make the patient and their family members more at ease, avoiding secondary injuries caused by accidental rolling, and ensuring the basic safety of the patient during the use of the nursing bed.

[0048] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A multifunctional gynecological nursing bed, comprising a bed body (1), characterized in that: A connecting frame (2) is fixedly installed at the bottom of the bed body (1), a universal wheel (3) is fixedly installed at the bottom of the connecting frame (2), and a fence (4) is fixedly installed on the outer side of the bed body (1); It further includes a moving component (5) for moving the patient on the bed body (1); A moving component (6) for supporting the feet of the patient when getting up; A protection component (7) for protecting the patient lying on the bed body (1); The moving component (5) includes: a driving motor (51), the driving motor (51) is fixedly installed on the outer side of the bed body (1), a threaded rod (52) is fixedly installed on the surface of the output shaft of the driving motor (51), a support rod (53) is arranged on the surface of the threaded rod (52), the support rod (53) is fixedly installed inside the connecting frame (2), the threaded rod (52) is threadedly connected inside the support rod (53), a slider (54) is threadedly connected to the surface of the threaded rod (52), the slider (54) is slidably connected inside the support rod (53), a movable plate (55) is fixedly installed at the bottom of the slider (54), one end of the movable plate (55) is hinged to a top plate (56), and the other end of the movable plate (55) is hinged to a bottom plate (512).

2. The multifunctional gynecological nursing bed according to claim 1, wherein: A sliding shaft (57) is fixedly installed inside the bottom plate (512), the sliding shaft (57) is rotatably connected to one end of the movable plate (55), and the sliding shaft (57) penetrates through the bed body (1).

3. The multifunctional gynecological nursing bed according to claim 1, characterized in that: A rotating rod (58) is fixedly installed inside the top plate (56), the rotating rod (58) is rotatably connected to the other end of the movable plate (55), the rotating rod (58) penetrates through the bed body (1), a gear (59) is fixedly installed on the surface of the rotating rod (58), a rack (510) is fixedly installed on the outer side of the bed body (1), and a pulley (511) is fixedly installed at the bottom of the movable plate (55), and the pulley (511) is slidably connected inside the bed body (1).

4. The multifunctional gynecological nursing bed according to claim 1, characterized in that: The moving component (6) includes: a rotating shaft (61), the rotating shaft (61) is rotatably connected to the inner side of the support rod (53), a sliding rod (62) is slidably connected to the surface of the rotating shaft (61), a telescopic plate (63) is fixedly installed on the surface of the sliding rod (62), the telescopic plate (63) is fixedly installed inside the connecting frame (2), and a fixing spring (64) is fixedly installed inside the telescopic plate (63).

5. The multifunctional gynecological nursing bed according to claim 4, wherein: A connecting shaft (65) is fixedly installed on the surface of the rotating shaft (61), the connecting shaft (65) is rotatably connected to the surface of the connecting frame (2), a fixing rod (66) is fixedly installed on the surface of the connecting shaft (65), a movable rod (67) is hinged to the surface of the fixing rod (66), a moving block (68) is hinged to the inner side of the movable rod (67), the moving block (68) is slidably connected to the surface of the connecting frame (2), a ladder platform (69) is fixedly installed at the bottom of the moving block (68), and the ladder platform (69) is slidably connected to the bottom of the connecting frame (2).

6. The multifunctional gynecological nursing bed according to claim 1, characterized in that: The protection component (7) includes: a retaining bar (71), the retaining bar (71) is slidably connected to the inside of the bed body (1), a connecting bar (72) is fixedly installed on the outer side of the retaining bar (71), a telescopic rod (73) is fixedly installed on the inner side of the connecting bar (72), a movable spring (74) is fixedly installed inside the telescopic rod (73), and the telescopic rod (73) is fixedly installed on the outer wall of the bed body (1).

7. The multifunctional gynecological nursing bed according to claim 6, wherein: There are two groups of the protection components (7), and the two groups of the protection components (7) are symmetrically arranged with the center line of the bed body (1) as the axis of symmetry.

8. A multifunctional gynecological nursing bed according to claim 4, characterized in that: A groove (10) is formed inside the bed body (1), a first sliding groove (11) is formed on the surface of the bed body (1), a strip-shaped groove (530) is formed on the surface of the support rod (53), an arc-shaped groove (610) is formed on the surface of the rotating shaft (61), and a second sliding groove (20) is formed on the surface of the connecting frame (2).

9. The multifunctional gynecological nursing bed according to claim 6, characterized in that: The cross-section of the movable plate (55) is H-shaped, and the cross-section of the retaining bar (71) is rectangular.

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