Multifunctional gynecological examination bed

Abstract

The utility model relates to the technical field of gynecologic examination beds, in particular to a multifunctional gynecologic examination bed which comprises a base plate, a supporting column is arranged in the middle of the upper surface of the base plate, a gynecologic examination bed body is arranged at the top of the supporting column, and a garbage collecting assembly is arranged on the left end face, close to the bottom, of the supporting column. A lighting assembly and a hanging assembly are sequentially arranged on the upper surface, close to the rear end, of the base plate from left to right, and adjustable armrests are arranged on backrests on the two side faces of the gynecological examination bed body; according to the multifunctional gynecological examination bed, by arranging the supporting column with the motor and the screw rod, stable up-and-down moving cooperation of the tiptoe on the side wall of the supporting column is achieved, the storage box with the trash basket is combined and connected with the supporting column, the overall attractiveness is improved, the first stand column is matched with the first lifting column with the illuminating lamp, and under the cooperation of the first fixing bolt, the tiptoe can stably move on the side wall of the supporting column; and through cooperation of a second stand column and a second lifting column with a hook, hanging cooperation of an infusion bag is achieved, and infusion cooperation is facilitated.

Description

Technical Field

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

[0002] Gynecological examination bed is also called gynecological operating table. It is an auxiliary medical equipment for hospitals, clinics, family planning stations and mobile gynecological examination vehicles to conduct various gynecological examinations, diagnostic operations and family planning examinations.

[0003] The utility model with publication number CN215081542U discloses a multifunctional gynecological examination bed, comprising a support frame, a sliding bed board is installed at the upper end of the support frame, a clothes hanger is installed on the rear side of the sliding bed board, and a support leg is fixedly installed at the lower end of the support frame;

[0004] According to the above technical solution, when the doctor is diagnosing the patient's condition, the patient can hang the clothes he takes off on the clothes hanger, thus avoiding the problem of placing clothes hangers in the room to hang clothes, thereby saving the indoor floor space. At the same time, the doctor can place temporary items on the extension board, which not only saves the use space, but also the extension board is at the lower end of the sliding bed board, thereby also realizing the protection of the items. When the patient needs to lie flat for diagnosis, the medical staff can first pull out the sliding bed board, then pull up the extension board, and rotate the support screw to support its extension arm, thereby increasing the area of ​​the bed, which is convenient for the patient to lie flat for use; however, the gynecological examination bed does not have a garbage collection device, and does not have a lighting structure, which is not convenient for clear detection and coordination, and does not have an infusion stand structure to increase the effect of the coordinated use of the diagnostic surgical infusion device, and does not have a footrest structure, which is not convenient for users of different body shapes to climb and lie flat for use. Utility Model Content

[0005] The purpose of the utility model is to provide a multifunctional gynecological examination bed to solve the problem that the multifunctional gynecological examination bed with the authorization publication number CN215081542U proposed in the above background technology does not have a garbage collection device, and does not have a lighting structure, which is not convenient for clear detection and coordination, and does not have an infusion stand structure to increase the effect of the use of diagnostic surgical infusion devices, and does not have a footrest structure, which is not convenient for users of different body shapes to climb and lie down for use.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A multifunctional gynecological examination bed comprises a base plate, a support column is provided in the middle of the upper surface of the base plate, a gynecological examination bed body is provided on the top of the support column, a garbage collection assembly is provided on the left end surface of the support column near the bottom, a footrest assembly is provided on the front end surface of the support column, the footrest assembly comprises a tiptoe and a ladder-shaped block connected to the rear end of the tiptoe, a mounting groove is provided on the top of the front end surface of the support column, a ladder-shaped groove is provided at the bottom of the mounting groove corresponding to the ladder-shaped block, a fixing plate is provided in the mounting groove, a motor is provided on the top of the fixing plate, a lighting assembly and a suspension assembly are provided in sequence from left to right on the upper surface of the base plate near the rear end, and adjustable armrests are provided on the backrests on both sides of the gynecological examination bed body.

[0008] Preferably, the bottom of the support column is welded and fixed to the top of the base plate, a hydraulic cylinder is provided on the upper surface of the base plate near the right end, the bottom of the hydraulic cylinder is hingedly matched with the base plate, and the top of the telescopic arm of the hydraulic cylinder is hingedly matched with the bottom surface of the backrest of the gynecological examination bed body.

[0009] In the utility model, the support column and the base plate are stably combined to increase the stability of the overall independent placement. With the cooperation of the hydraulic cylinder, it is helpful to adjust the angle between the backrest on the gynecological examination bed body and the bed body to achieve flat lying or tilted cooperation of the backrest.

[0010] Preferably, adjustable support pads are provided on both sides of the support column near the left top, the top of the support pad is welded and fixed to the support column through a movable connecting seat, the bottom of the support pad is plugged into the connecting seat through an insert rod, and the connecting seat is equipped with corresponding fastening screws.

[0011] In the utility model, the support pad is provided to help the patient to place his legs and feet, and the support provided is helpful for corresponding diagnosis and detection. The support pad can be manually adjusted according to the size of the patients, so as to stably support them.

[0012] Preferably, the collection component includes a storage box and a trash can plugged into the storage box, the right end of the storage box is welded and fixed to the left end face of the support column, a storage bin is provided on the top of the storage box, a card slot is provided on the left end of the inner wall of the storage bin, card blocks are provided on both side faces of the storage box corresponding to the card slots, and an invisible handle is provided on the left end face of the trash can near the top.

[0013] In the utility model, the card block is plugged into the card slot to increase the stability of the installation of the storage box and the trash basket, and the invisible handle helps to take out, replace and clean the trash basket.

[0014] Preferably, the ladder block and the toeboard are an integrally formed structure, the width of the outer wall of the ladder block is adapted to the width of the inner wall of the ladder groove, the width of the outer wall of the fixing plate is adapted to the width of the inner wall of the mounting groove, the motor is fixedly connected to the fixing plate by screws, the output shaft of the motor passes through the fixing plate and is coaxially connected to the screw, and the diameter of the screw is adapted to the inner diameter of the second screw hole.

[0015] In the utility model, the ladder-shaped block is plugged into the ladder-shaped groove, which helps the tiptoe to stably move up and down on the side of the support column. The motor is set and connected to the external power supply. The output shaft rotates to drive the screw rod to rotate and connect, so that the tiptoe can move up and down, and then the height of the tiptoe can be adjusted, which is convenient for patients of different body shapes to step on and use.

[0016] Preferably, the lighting assembly includes a first column and a first lifting column plugged into the top of the first column, the bottom of the first column is welded and fixed to the base plate, the top of the first column is provided with a first circular groove corresponding to the first lifting column, a third screw hole communicating with the first circular groove is provided on the outer wall of the first column near the top, a first fixing bolt is provided in the third screw hole, and a lighting lamp is provided at the top end of the first lifting column.

[0017] In the utility model, the first lifting column is plugged into the first circular groove, and the first fixing bolt is threadedly connected to the third screw hole. The end of the first fixing bolt is tightly fitted with the outer wall of the first lifting column, and the position of the first lifting column in the first column is fixed under the action of friction, thereby realizing the height adjustment of the lighting lamp and correspondingly realizing the patient lighting diagnosis.

[0018] Preferably, the suspension assembly includes a second column and a second lifting column plugged into the top of the second column, the bottom of the second column is welded and fixed to the base plate, the top of the second column is provided with a second circular groove corresponding to the second lifting column, a fourth screw hole communicating with the second circular groove is provided on the outer wall of the second column near the top, a second fixing bolt is provided in the fourth screw hole, and hooks are symmetrically provided on the top of the second lifting column.

[0019] In the utility model, the second lifting column is plugged into and matched with the second circular groove, and the second fixing bolt is threadedly connected with the fourth screw hole. The end of the second fixing bolt is tightly fitted with the outer wall of the second lifting column, and the position of the second lifting column in the second column is fixed under the action of friction. With the cooperation of the two hooks, it is helpful to suspend the infusion bag, and the height of the second lifting column is easy to manually adjust to achieve infusion cooperation at different heights.

[0020] Preferably, pins corresponding to the armrests are provided near the middle position on both sides of the backrest of the gynecological examination bed body, the ends of the armrests are rotatably connected to the pins, and a first screw hole is opened on the outer wall of the armrest corresponding to the pin, and a fastening bolt is provided in the first screw hole.

[0021] In the utility model, the armrest is rotatably connected with the pin shaft. When not in use, the armrest and the backrest of the gynecological examination bed body are kept horizontal, which is helpful for storage cooperation. The fastening bolt is threadedly connected with the first screw hole, and the position of the armrest and the pin shaft is fixed under the action of friction. With the cooperation of the armrest, it is helpful to intercept and protect the patient lying on the gynecological examination bed body.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The utility model sets a support column with a motor and a screw to achieve stable up and down movement of the toeboard on the side wall of the support column. The storage box with a trash basket is combined and connected with the support column, which is helpful for centralized collection and treatment of garbage generated by diagnosis and increases the overall aesthetics. The first column cooperates with the first lifting column with a lighting lamp, and with the cooperation of the first fixing bolt, the position of the lighting lamp is adjusted. The second column cooperates with the second lifting column with a hook to achieve the hanging of the infusion bag, which is convenient for infusion.

[0024] 2. The utility model provides an armrest that is rotatably connected to a pin shaft on the main body of the gynecological examination bed. The installation of the armrest helps to intercept the patient lying on the main body of the gynecological examination bed, and the armrest helps to be horizontally stored with the backrest of the main body of the gynecological examination bed, thereby increasing the overall aesthetics. The tightening bolts help to manually fix the rotating position of the armrest, and the hydraulic cylinder helps to adjust the inclination angle of the backrest on the main body of the gynecological examination bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the utility model in a supine state;

[0027] Figure 3 It is a side view schematic diagram of the utility model lying on its back;

[0028] Figure 4 This is a schematic diagram of the combined structure of the base plate and the support column of the utility model;

[0029] Figure 5 This is a schematic diagram of the combined structure of the support column, the collection assembly, and the pedal assembly of the utility model;

[0030] Figure 6 This is a schematic diagram of the lighting assembly structure of the utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the suspension assembly of the utility model;

[0032] Figure 8The utility model is a schematic diagram of the combined structure of a gynecological examination bed and an armrest.

[0033] The meaning of each number in the figure is:

[0034] 1. Base plate; 10. Hydraulic cylinder;

[0035] 2. Support column; 20. Mounting slot; 200. Ladder-shaped slot; 21. Fixing plate; 210. Motor; 211. Screw;

[0036] 3. Gynecological examination bed body; 30. Pin shaft; 31. Handrail; 310. First screw hole; 311. Fastening bolt;

[0037] 4. Collection component; 40. Storage box; 400. Storage compartment; 401. Card slot; 41. Trash basket; 410. Invisible handle; 411. Card block;

[0038] 5. Footrest assembly; 50. Tiptoe board; 51. Ladder block; 510. Second screw hole;

[0039] 6. Lighting assembly; 60. First column; 600. First circular groove; 601. Third screw hole; 602. First fixing bolt; 61. First lifting column; 610. Lighting lamp;

[0040] 7. Suspension assembly; 70. Second column; 700. Second circular groove; 701. Fourth screw hole; 702. Second fixing bolt; 71. Second lifting column; 710. Hook;

[0041] 8. Support pad. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] See also Figure 1-Figure 8 , this embodiment provides a technical solution:

[0044] A multifunctional gynecological examination bed comprises a base plate 1, a support column 2 is provided in the middle of the upper surface of the base plate 1, the bottom of the support column 2 is welded and fixed to the top of the base plate 1, a hydraulic cylinder 10 is provided near the right end of the upper surface of the base plate 1, the bottom of the hydraulic cylinder 10 is hinged to the base plate 1, and the top of the telescopic arm of the hydraulic cylinder 10 is hinged to the bottom surface of the backrest of the gynecological examination bed body 3.

[0045] In the utility model, the support column 2 and the base plate 1 are stably combined to increase the stability of the overall independent placement. With the cooperation of the hydraulic cylinder 10, it is helpful to adjust the angle between the backrest on the gynecological examination bed body 3 and the bed body to achieve flat or tilted cooperation of the backrest.

[0046] Furthermore, adjustable support pads 8 are provided on both sides of the support column 2 near the top of the left side. The top of the support pad 8 is welded and fixed to the support column 2 through a movable connecting seat, and the bottom of the support pad 8 is plugged into the connecting seat through an insert rod, and the connecting seat is equipped with corresponding fastening screws.

[0047] In the present invention, the support pad 8 is provided to help the patient to place his legs and feet, and to provide support to help to carry out corresponding diagnostic tests. The support pad 8 can be manually adjusted according to the size of the patients, so as to stably carry out the support.

[0048] Specifically, a gynecological examination bed body 3 is provided on the top of the support column 2, and a garbage collection component 4 is provided on the left end surface of the support column 2 near the bottom. The collection component 4 includes a storage box 40 and a trash can 41 plugged into the storage box 40. The right end of the storage box 40 is welded and fixed to the left end surface of the support column 2. A storage bin 400 is provided on the top of the storage box 40, and a card slot 401 is provided on the left end of the inner wall of the storage bin 400. Card blocks 411 are provided on both side surfaces of the storage box 40 corresponding to the card slot 401, and an invisible handle 410 is provided on the left end surface of the trash can 41 near the top.

[0049] In the present invention, the card block 411 is plugged into the card slot 401 to increase the stability of the installation of the storage box 40 and the trash basket 41. The invisible handle 410 helps to take out the trash basket 41 for replacement and cleaning.

[0050] It should be noted that a foot pedal assembly 5 is provided on the front end surface of the support column 2, and the foot pedal assembly 5 includes a tiptoe board 50 and a trapezoidal block 51 connected to the rear end of the tiptoe board 50. A mounting groove 20 is provided at the top of the front end surface of the support column 2, and a trapezoidal groove 200 is provided at the bottom of the mounting groove 20 corresponding to the trapezoidal block 51. A fixing plate 21 is provided in the mounting groove 20, and a motor 210 is provided on the top of the fixing plate 21. The trapezoidal block 51 and the tiptoe board 50 are an integrally formed structure. The width of the outer wall of the trapezoidal block 51 is adapted to the width of the inner wall of the trapezoidal groove 200, and the width of the outer wall of the fixing plate 21 is adapted to the width of the inner wall of the mounting groove 20. The motor 210 is fixedly connected to the fixing plate 21 by screws, and the output shaft of the motor 210 passes through the fixing plate 21 and is coaxially connected to the screw 211, and the diameter of the screw 211 is adapted to the inner diameter of the second screw hole 510.

[0051] In the utility model, the ladder block 51 is plugged into the ladder groove 200, which helps the tiptoe board 50 to stably move up and down on the side of the support column 2. The motor 210 is set and connected to the external power supply. The output shaft rotates to drive the screw 211 to rotate and connect, so that the tiptoe board 50 can move up and down, and then the height of the tiptoe board 50 can be adjusted, which is convenient for patients of different body shapes to step on and use.

[0052] Furthermore, a lighting assembly 6 and a suspension assembly 7 are provided on the upper surface of the base plate 1 near the rear end from left to right;

[0053] Secondly, the lighting assembly 6 includes a first column 60 and a first lifting column 61 plugged into the top of the first column 60, the bottom of the first column 60 is welded and fixed to the base plate 1, a first circular groove 600 corresponding to the first lifting column 61 is opened on the top of the first column 60, a third screw hole 601 connected to the first circular groove 600 is opened on the outer wall of the first column 60 near the top, a first fixing bolt 602 is provided in the third screw hole 601, and a lighting lamp 610 is provided at the top end of the first lifting column 61.

[0054] In the utility model, the first lifting column 61 is plugged into the first circular groove 600, and the first fixing bolt 602 is threadedly connected to the third screw hole 601. The end of the first fixing bolt 602 is tightly fitted with the outer wall of the first lifting column 61, and the position of the first lifting column 61 in the first column 60 is fixed under the action of friction, thereby realizing the height adjustment of the lighting lamp 610, and correspondingly realizing the patient lighting diagnosis cooperation.

[0055] It is worth adding that the suspension assembly 7 includes a second column 70 and a second lifting column 71 plugged into the top of the second column 70, the bottom of the second column 70 is welded and fixed to the base plate 1, a second circular groove 700 corresponding to the second lifting column 71 is provided on the top of the second column 70, a fourth screw hole 701 connected to the second circular groove 700 is provided on the outer wall of the second column 70 near the top, a second fixing bolt 702 is provided in the fourth screw hole 701, and hooks 710 are symmetrically provided on the top of the second lifting column 71.

[0056] In the present invention, the second lifting column 71 is plugged into the second circular groove 700, and the second fixing bolt 702 is threadedly connected to the fourth screw hole 701. The end of the second fixing bolt 702 is tightly fitted with the outer wall of the second lifting column 71, and the position of the second lifting column 71 in the second column 70 is fixed under the action of friction. With the cooperation of the two hooks 710, it is helpful to suspend the infusion bag, and the height of the second lifting column 71 is easy to manually adjust to achieve infusion cooperation at different heights.

[0057] Furthermore, adjustable armrests 31 are provided on the backrests on both sides of the gynecological examination bed body 3 .

[0058] In addition, pin shafts 30 corresponding to the armrests 31 are provided near the middle position on the arms on both sides of the backrest of the gynecological examination bed body 3, and the ends of the armrests 31 are rotatably connected to the pin shaft 30. A first screw hole 310 is opened on the outer wall of the armrest 31 at a position corresponding to the pin shaft 30, and a fastening bolt 311 is provided in the first screw hole 310.

[0059] In the present invention, the armrest 31 is rotatably connected with the pin shaft 30. When not in use, the armrest 31 and the backrest of the gynecological examination bed body 3 are kept horizontal, which is helpful for storage cooperation. The fastening bolt 311 is threadedly connected with the first screw hole 310, and the position of the armrest 31 and the pin shaft 30 is fixed under the action of friction. With the cooperation of the armrest 31, it is helpful to intercept and protect the patient lying on the gynecological examination bed body 3.

[0060] When the multifunctional gynecological examination bed of this embodiment is used, the user first plugs the footboard 50 into the trapezoidal groove 200 on the support column 2 through the trapezoidal block 51, plugs the fixing plate 21 with the motor 210 into the mounting groove 20, and the screw 211 connected to the output shaft of the motor 210 is threadedly connected with the second screw hole 510 on the trapezoidal block 51, plugs the trash basket 41 into the slot 401 through the clamping block 411, plugs the first lifting column 61 with the lighting lamp 610 into the first column 60, and plugs the second lifting column 71 with the hook 710 into the second column 70;

[0061] The user manually adjusts the operation of the motor 210 to rotate the screw 211 and adjust the position of the footrest 50 to facilitate different patients to step on and use it. The patient lies on the gynecological examination bed body 3 according to the position change that needs to be detected, manually rotates the armrest 31 and fixes the position by tightening the bolt 311 to achieve patient interception protection, and then controls the telescopic arm of the hydraulic cylinder 10 to extend or shorten to achieve the backrest angle adjustment coordination of the gynecological examination bed body 3, and then manually rotates the first lifting column 61 with the lighting lamp 610 to achieve diagnostic lighting coordination, and adjusts the first column 60 and the first The total height of the lifting column 61 is adjusted and fixed by the first fixing bolt 602. When infusion is needed, the infusion bag is suspended with the cooperation of the hook 710, and the total height of the second lifting column 71 and the second column 70 is adjusted according to the size of different infusion bags, and the position is fixed with the cooperation of the second fixing bolt 702. With the cooperation of the trash can 41, it is helpful to collect garbage and waste, and with the cooperation of the invisible handle 410, it is helpful to take out and replace the trash can 41. The overall combination is easy to install and fits tightly with the support column 2, which increases the beauty of the overall appearance.

Claims

1. A multifunctional gynecological examination bed, comprising a base plate (1), a support column (2) being provided in the middle of the upper surface of the base plate (1), and a gynecological examination bed body (3) being provided on the top of the support column (2), characterized in that: A garbage collection assembly (4) is provided on the left end surface of the support column (2) near the bottom, a footrest assembly (5) is provided on the front end surface of the support column (2), the footrest assembly (5) comprises a toeboard (50) and a ladder-shaped block (51) connected to the rear end of the toeboard (50), a mounting groove (20) is provided on the top of the front end surface of the support column (2), a ladder-shaped groove (200) is provided at the bottom of the mounting groove (20) corresponding to the ladder-shaped block (51), a fixing plate (21) is provided in the mounting groove (20), a motor (210) is provided on the top of the fixing plate (21), a lighting assembly (6) and a suspension assembly (7) are provided in sequence from left to right on the upper surface of the base plate (1) near the rear end, and adjustable armrests (31) are provided on the backrests of both sides of the gynecological examination bed body (3).

2. The multifunctional gynecological examination bed according to claim 1, characterized in that: The bottom of the support column (2) is welded and fixed to the top of the base plate (1); a hydraulic cylinder (10) is provided on the upper surface of the base plate (1) near the right end; the bottom of the hydraulic cylinder (10) is hingedly engaged with the base plate (1); the top of the telescopic arm of the hydraulic cylinder (10) is hingedly engaged with the bottom surface of the backrest of the gynecological examination bed body (3).

3. The multifunctional gynecological examination bed according to claim 1, characterized in that: Adjustable support pads (8) are provided on both sides of the support column (2) near the left top. The top of the support pad (8) is welded and fixed to the support column (2) via a movable connecting seat. The bottom of the support pad (8) is plugged into the connecting seat via an insert rod, and the connecting seat is equipped with corresponding fastening screws.

4. The multifunctional gynecological examination bed according to claim 1, characterized in that: The collecting assembly (4) comprises a storage box (40) and a trash basket (41) plugged into the storage box (40); the right end of the storage box (40) is welded and fixed to the left end face of the support column (2); a storage bin (400) is provided on the top of the storage box (40); a card slot (401) is provided on the left end of the inner wall of the storage bin (400); card blocks (411) are provided on both side faces of the storage box (40) at positions corresponding to the card slot (401); and an invisible handle (410) is provided on the left end face of the trash basket (41) near the top.

5. The multifunctional gynecological examination bed according to claim 1, characterized in that: The ladder block (51) and the toeboard (50) are integrally formed structures. The width of the outer wall of the ladder block (51) matches the width of the inner wall of the ladder groove (200). The width of the outer wall of the fixing plate (21) matches the width of the inner wall of the mounting groove (20). The motor (210) is fixedly connected to the fixing plate (21) by screws. The output shaft of the motor (210) passes through the fixing plate (21) and is coaxially connected to the screw rod (211). The diameter of the screw rod (211) matches the inner diameter of the second screw hole (510).

6. The multifunctional gynecological examination bed according to claim 1, characterized in that: The lighting assembly (6) comprises a first column (60) and a first lifting column (61) plugged into the top of the first column (60); the bottom of the first column (60) is welded and fixed to the base plate (1); the top of the first column (60) is provided with a first circular groove (600) corresponding to the first lifting column (61); a third screw hole (601) connected to the first circular groove (600) is provided on the outer wall of the first column (60) near the top; a first fixing bolt (602) is provided in the third screw hole (601); and a lighting lamp (610) is provided at the top end of the first lifting column (61).

7. The multifunctional gynecological examination bed according to claim 1, characterized in that: The suspension assembly (7) comprises a second column (70) and a second lifting column (71) plugged into the top of the second column (70); the bottom of the second column (70) is welded and fixed to the base plate (1); the top of the second column (70) is provided with a second circular groove (700) corresponding to the second lifting column (71); a fourth screw hole (701) connected to the second circular groove (700) is provided on the outer wall of the second column (70) near the top; a second fixing bolt (702) is provided in the fourth screw hole (701); and hooks (710) are symmetrically provided on the top of the second lifting column (71).

8. The multifunctional gynecological examination bed according to claim 1, characterized in that: A pin shaft (30) corresponding to the armrest (31) is provided near the middle position on both sides of the backrest of the gynecological examination bed body (3), and the end of the armrest (31) is rotatably connected to the pin shaft (30). A first screw hole (310) is opened on the outer wall of the armrest (31) at a position corresponding to the pin shaft (30), and a fastening bolt (311) is provided in the first screw hole (310).

Images