Extensible wheelchair for physical examination

Abstract

The present application relates to the technical field of medical equipment, in particular to a stretchable wheelchair for physical examination, which comprises a wheelchair body and a wheel set arranged under the wheelchair body, the wheelchair body comprises a seat cushion plate, a backrest rotatably connected with the rear end of the seat cushion plate, and a footrest assembly rotatably connected with the front end of the seat cushion plate, the footrest assembly comprises a vertically arranged calf plate and a horizontally arranged pedal, the upper end of the calf plate is rotatably connected with the front end of the seat cushion plate, the lower end of the calf plate is rotatably connected with the pedal, the seat cushion plate is provided with a front locking piece for locking the calf plate to the seat cushion plate and a rear locking piece for locking the backrest to the seat cushion plate, the seat cushion plate is slidably provided with a rear insertion rod and a front insertion rod on both sides along the front-rear direction of the wheelchair, and the wheel set comprises large wheels and small wheels rotatably arranged on both sides of the seat cushion plate and the pedal. The stretchable wheelchair can be stretched and changed into a bed plate, which is convenient for patients who are prohibited from moving to lie down for examination.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to an extendable wheelchair for physical examinations. Background Technology

[0002] As a medical device, wheelchairs are generally used as an important means of mobility for injured or sick patients and people with disabilities for home rehabilitation, transportation, medical treatment, and outdoor activities. Existing wheelchairs only have the advantage of facilitating patient transfer, but they cannot achieve a flat position. In some special medical scenarios, such as when patients in emergency trauma who cannot be moved need to be transferred to the examination room for physical examination or examination in a flat position, after the traditional wheelchair transfer, the patient still needs to be manually moved to the examination bed to be in a flat position for examination. Manually moving the patient from the wheelchair to the examination bed is time-consuming and laborious, and may also cause secondary injury to the patient. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an extendable wheelchair for physical examination, so as to solve the problem in the background art that patients who are prohibited from being moved are inconvenient to lie flat for examination.

[0004] To solve the above-mentioned technical problems, a basic solution adopted by the present invention is: an extendable wheelchair for physical examination, comprising a wheelchair body and a wheel assembly disposed under the wheelchair body. The wheelchair body includes a seat cushion, a backrest rotatably connected to the rear end of the seat cushion, and a footrest assembly rotatably connected to the front end of the seat cushion. The footrest assembly includes a vertically arranged leg rest and a horizontally arranged pedal. The upper end of the leg rest is rotatably connected to the front end of the seat cushion, and the lower end of the leg rest is rotatably connected to the pedal. The seat cushion is provided with a front locking member for locking the lower leg plate to the seat cushion and a rear locking member for locking the backrest to the seat cushion. Both sides of the seat cushion are provided with a rear insert rod and a front insert rod that slide along the front-rear direction of the wheelchair. Both sides of the backrest are provided with a rear insert tube that cooperates with the rear insert rod. The lower leg plate is provided with a front insert tube that cooperates with the front insert rod. The wheel set includes large wheels that are rotatably mounted on both sides of the seat cushion to support the seat cushion and small wheels that are rotatably mounted on both sides of the pedal to support the pedal.

[0005] Furthermore, the wheelchair body also includes a drive mechanism. When the backrest is rotated away from the seat cushion and is in a horizontal state, the drive mechanism drives the large wheels to move away from the small wheels.

[0006] Furthermore, the driving mechanism includes a groove disposed on the bottom surface of the seat cushion, a wheel seat one slidably connected to the groove, a fixed plate fixedly connected to the bottom surface of the seat cushion, a wheel seat two fixedly connected to the fixed plate, a gear one rotatably mounted on the wheel seat two, a spur rack fixedly connected to the wheel seat one, and an arc-shaped rack disposed on the backrest and meshing with the gear one. The rotation axis of the arc-shaped rack is collinear with the rotation axis of the backrest relative to the seat cushion. The groove is horizontally arranged along the front-rear direction of the seat cushion. A fixing plate is positioned near the rear end of the seat cushion. A gear is positioned on the side of the fixing plate near the rear end of the seat cushion. The rotation axis of the gear is horizontally positioned along the left-right direction of the seat cushion. The large wheel is rotatably connected to the lower end of the wheel seat through a rotating shaft. The rack is horizontally positioned along the front-back direction of the seat cushion. The lower end of the fixing plate is provided with a sliding hole that slides with the rack. The front end of the rack is fixedly connected to the wheel seat. The rear end of the rack passes through the sliding hole and is located below the gear and meshes with the gear.

[0007] Furthermore, the small wheel is mounted on the wheel seat three, and the wheel seat three is slidably connected to the pedal through sliding members symmetrically arranged at the left and right ends of the pedal.

[0008] Furthermore, the sliding member includes a sliding rod horizontally arranged along the front-rear direction of the seat plate, a sliding seat three slidably connected to the sliding rod, and a locking member that locks the sliding rod to the sliding seat three. The sliding seat three is fixedly connected to the pedal, one end of the sliding rod is fixedly connected to the wheel seat three, and the other end of the sliding rod passes through the sliding seat three and is slidably connected to the sliding seat three.

[0009] Furthermore, the locking element includes a locking screw disposed radially on the slide block three along the slide rod.

[0010] Furthermore, the pedal is provided with a lower locking member to lock the pedal to the lower leg plate.

[0011] Furthermore, the lower locking component includes a support plate three fixedly connected to the lower end side wall of the calf plate. The support plate three has a through hole three in a direction parallel to the axis of the large wheel. The pedal has a screw hole three that mates with the through hole three. The screw hole three is internally threaded with a screw rod three. Furthermore, the front locking component includes a support plate fixedly connected to the front side wall of the seat plate. A through hole is provided on the support plate in a direction parallel to the axis of the large wheel. A screw hole corresponding to the through hole is provided at the upper end of the lower leg plate. A screw rod is internally threaded into the screw hole.

[0012] Furthermore, the rear locking component includes a second support plate fixedly connected to the rear side wall of the seat cushion. The second support plate has a second through hole in a direction parallel to the axis of the large wheel. The lower end of the backrest has a second screw hole corresponding to the second through hole, and the second screw hole is internally threaded with a second screw rod.

[0013] In this design, after the seat cushion and leg plate are locked together using the front locking member, rear locking member, lower locking member, and locking member respectively, the seat cushion and backrest are locked together, the leg plate and pedal are locked together, and the wheel seat is locked together with the pedal, the patient can sit in the wheelchair, facilitating patient transfer. When the patient needs to lie flat for examination, the front locking member, rear locking member, lower locking member, and locking member are released respectively. The backrest is rotated away from the seat cushion to make it horizontal. When the backrest is horizontal, the rear insert rods on both sides of the seat cushion are slid to insert the rear ends of the rear insert rods into the rear insert tubes, preventing the backrest from rotating relative to the seat cushion. The leg plate is then rotated to make it horizontal. At this time, the front insert rod on the seat cushion is aligned with the front insert tube on the leg plate. The front insert rod is slid to insert the front ends of the front insert rods into the front insert tubes, preventing the leg plate from rotating relative to the seat cushion. At this time, the backrest, seat cushion, and leg plate are connected to form a bed board for the patient to lie flat.

[0014] When the backrest is rotated away from the seat cushion to make it horizontal, the arc-shaped rack fixed to the backrest rotates, causing gear one to rotate. In turn, the straight rack meshing with gear one slides towards the rear end of the seat cushion, causing wheel seats one and the large wheels to slide towards the rear end of the seat cushion, increasing the distance between the large and small wheels. This effectively prevents the wheelchair, which has been unfolded into a bed, from tipping over towards the backrest.

[0015] After the lower leg plate rotates to a horizontal position, the sliding rod slides relative to the slide seat three so that the small wheel still contacts the ground. At this time, the sliding rod is locked and fixed on the slide seat three by tightening the locking screw to support the lower leg plate and prevent the wheelchair, which has been unfolded into a bed board, from tipping over towards the lower leg.

[0016] Compared with existing wheelchairs, the extendable wheelchair for medical examinations using this solution has at least the following advantages: The wheelchair in this solution can be used as a regular chair for easy patient transfer. When the patient needs to lie flat for examination, it can be extended and transformed into a flat bed board to facilitate examination while the patient is lying down. In this solution, when the wheelchair is rotated and extended into bed board shape, the distance between the large and small wheels automatically increases, which can effectively improve the stability when used as a bed board and effectively prevent the bed board from tipping over. In this solution, as the patient's upper body gradually lies flat with the slowly rotating backrest, the large wheels also gradually move towards the patient's head, effectively preventing the wheelchair from suddenly tipping backward. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of the application and are used to explain the application, but do not constitute an undue limitation of the application. In the drawings: Figure 1 This is a schematic diagram of the structure of an extendable wheelchair for physical examination according to the present invention, viewed from the front.

[0018] Figure 2 for Figure 1 Enlarged view of section A.

[0019] Figure 3 This is a schematic diagram of the structure of an extendable wheelchair for physical examination, which extends to form a bed board, from the front view direction.

[0020] Figure 4 This is a schematic diagram of the structure of an extendable wheelchair for physical examinations, which extends to form a bed board, viewed from a top-down direction.

[0021] Figure 5 This is a schematic diagram of the structure of an extendable wheelchair for physical examinations, viewed from the left side.

[0022] Figure 6 This is a schematic diagram of the mating of the seat pad and wheel seat in the left view direction.

[0023] The meanings of the labels in the attached diagram are as follows: Seat pad - 10; Rear insert rod - 101; Front insert rod - 102; Slide groove - 103; Wheel seat one - 104; Fixing plate - 105; Slide hole - 1051; Wheel seat two - 106; Gear one - 107; Straight rack - 108; Arc rack - 109; Rotating shaft one - 1010; Slide one - 1011; Slide two - 1012; Support plate one - 1013; Through hole one - 1014; Screw hole one - 1015; Support plate two - 1016; Through hole two - 1017; Screw hole two - 1018; Screw two - 1019. Backrest -20; Rear insertion tube -201; Lower leg plate-30; Anterior insertion tube-301; Pedal-40; Support plate three-401; Through hole three-402; Screw hole three-403; Large Wheel-50; Small wheel - 60; Wheel seat three - 601; Slide bar - 602; Slide seat three - 603; Locking screw - 604. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0026] This embodiment describes an extendable wheelchair for physical examinations, such as... Figures 1-6 As shown, the wheelchair includes a wheelchair body and a wheel set disposed under the wheelchair body. The wheelchair body includes a seat cushion 10, a backrest 20 rotatably connected to the rear end of the seat cushion 10, a foot pedal assembly rotatably connected to the front end of the seat cushion 10, and a drive mechanism for driving the wheel set to move.

[0027] The footrest assembly includes a vertically arranged leg plate 30 and a horizontally arranged pedal 40. The upper end of the leg plate 30 is rotatably connected to the front end of the seat cushion 10, and the lower end of the leg plate 30 is rotatably connected to the pedal 40. The seat cushion 10 is provided with a front locking member for locking the leg plate 30 to the seat cushion 10 and a rear locking member for locking the backrest 20 to the seat cushion 10. Both sides of the seat cushion 10 are slidably provided with a rear insert rod 101 and a front insert rod 101 along the front-rear direction of the wheelchair. 02, the backrest 20 is provided with rear insertion tubes 201 that cooperate with the rear insertion rod 101 on both sides, the calf plate 30 is provided with a front insertion tube 301 that cooperates with the front insertion rod 102, the pedal 40 is provided with a lower locking member that locks the pedal 40 and the calf plate 30, and the wheel set includes large wheels 50 rotatably disposed on both sides of the seat cushion 10 for supporting the seat cushion 10 and small wheels 60 rotatably disposed on both sides of the pedal 40 for supporting the pedal 40.

[0028] In this embodiment, when the patient is sitting on the seat cushion 10, the side the patient is facing is defined as the front, the side the patient is facing away from is defined as the back, the direction that is horizontal and perpendicular to the front-back direction of the seat cushion 10 is defined as the left-right direction, the front end of the seat cushion 10 is the front end of the seat cushion 10, and the rear end of the seat cushion 10 is the rear end of the seat cushion 10.

[0029] In this embodiment, the rear end of the seat cushion 10 is provided with a slot that mates with the backrest 20. One end of the backrest 20 is located in the slot and is rotatably connected to the seat cushion 10. The pivot shaft that rotatably connects the backrest 20 and the seat cushion 10 is horizontally arranged along the left-right direction of the seat cushion 10. The front end of the seat cushion 10 is provided with a slot that mates with the leg plate 30. The upper end of the leg plate 30 is located in the slot at the front end of the seat cushion 10 and is rotatably connected to the seat cushion 10. The pivot shaft that rotatably connects the leg plate 30 and the seat cushion 10 is horizontally arranged along the left-right direction of the seat cushion 10.

[0030] Both the front insert rod 102 and the rear insert rod 101 are square rods. A square tubular slide block 1011, which slides with the front insert rod 102, and a square tubular slide block 2012, which slides with the rear insert rod 101, are fixedly connected to the left and right end faces of the seat cushion 10, respectively. A square tubular rear insert tube 201, which slides with the rear insert rod 101, is fixedly connected to the left and right end faces of the backrest 20. A square tubular front insert tube 301, which slides with the front insert rod 102, is fixedly connected to the left and right end faces of the calf plate 30. When the backrest 20, the seat cushion 10, and the calf plate 30 are all in a horizontal state, the rear insert rod 101 and the rear insert tube 201 are horizontally aligned, and the front insert rod 102 and the front insert tube 301 are horizontally aligned.

[0031] like Figure 1 , Figure 5 As shown, the front locking component includes a first support plate 1013 symmetrically arranged on both sides of the seat cushion 10. The first support plate 1013 is fixedly connected to the front side wall of the seat cushion 10. A through hole 1014 is provided on the first support plate 1013 along a direction parallel to the axis of the large wheel 50. The upper end of the lower leg plate 30 is provided with a screw hole 1015 corresponding to the through hole 1014. The screw hole 1015 is internally threaded to a screw rod 1. The rear locking component includes a second support plate 1016 symmetrically arranged on both sides of the seat cushion 10. The second support plate 1016 is fixedly connected to the rear side wall of the seat cushion 10. A second through hole 1017 is provided on the second support plate 1016 along a direction parallel to the axis of the large wheel 50. The lower side wall of the backrest 20 is provided with a second screw hole 1018 corresponding to the through hole 1017. The screw hole 1018 is internally threaded to a screw rod 1019.

[0032] The lower locking component includes a support plate 401 fixedly connected to the lower side wall of the lower leg plate 30. The support plate 401 has a through hole 402 in a direction parallel to the axis of the large wheel 50. The pedal 40 has a screw hole 403 that mates with the through hole 402. The screw hole 403 is internally threaded with a screw rod.

[0033] like Figure 1 , Figure 5 As shown, the small wheel 60 is mounted on wheel seat 601 and rotatably connected to wheel seat 601. Sliding members are symmetrically arranged below the left and right ends of the pedal 40. The wheel seat 601 is slidably connected to the pedal 40 via the sliding members. Each sliding member includes a sliding rod 602 horizontally arranged along the front-rear direction of the seat 10, a sliding seat 603 slidably connected to the sliding rod 602, and a locking member that locks the sliding rod 602 to the sliding seat 603. The sliding rod 602 is a square rod, and the sliding seat 603 is fixedly connected to the lower surface of the pedal 40. The seat 603 is provided with a through hole 4 that slides and engages with the slide rod 602. One end of the slide rod 602 is fixedly connected to the wheel seat 601, and the other end of the slide rod 602 extends through the through hole 4 on the seat 603 in a direction away from the wheel seat 601. The locking member includes a locking screw 604 that is radially disposed on the slide 603 along the slide rod 602. The slide 603 is provided with a threaded hole that is threadedly engaged with the locking screw 604 and connects the through hole 4 with the external space of the slide 603. The locking screw 604 is located in the threaded hole.

[0034] Combination Figure 1 , Figure 2 , Figure 5 , Figure 6As shown, the drive mechanism includes a groove 103 disposed on the bottom surface of the seat cushion 10, a wheel seat 104 slidably connected to the groove 103, a fixing plate 105 fixedly connected to the bottom surface of the seat cushion 10, a wheel seat 2 106 fixedly connected to the fixing plate 105, a gear 107 rotatably mounted on the wheel seat 2 106, a straight rack 108 fixedly connected to the wheel seat 104, and an arc-shaped rack 109 disposed on the backrest 20 and meshing with the gear 107. The rotation axis of the arc-shaped rack 109 is collinear with the rotation axis of the backrest 20 and the seat cushion 10. The slide groove 103 is horizontally arranged along the front-back direction of the seat cushion 10. The fixing plate 105 is vertically arranged near the rear end of the seat cushion 10. The upper end of the fixing plate 105 is fixedly connected to the bottom surface of the seat cushion 10. The gear 107 is arranged on the side of the fixing plate 105 near the rear end of the seat cushion 10. The gear 107 is rotatably connected to the wheel seat 106 through a rotating shaft. The axis of the rotating shaft connecting the gear 107 and the wheel seat 106 is horizontally arranged along the left-right direction of the seat cushion 10. The arc-shaped rack 109 is located above the gear 107 and meshes with the gear 107. In order not to hinder the arc-shaped rack 109 from rotating with the backrest 20, a relief groove corresponding to the arc-shaped rack 109 is recessed on the lower surface of the seat cushion 10. The large wheel 50 is rotatably connected to the lower end of the wheel seat 104 via a rotating shaft 1010. The rack 108 is horizontally arranged along the front-rear direction of the seat plate 10. The lower end of the fixing plate 105 is provided with a sliding hole 1051 that slides with the rack 108. The front end of the rack 108 is fixedly connected to the wheel seat 104. The rear end of the rack 108 passes through the sliding hole 1051 and is located below the gear 107 and meshes with the gear 107.

[0035] When this solution is in use, the seat cushion 10 and the lower leg plate 30 are locked together by the front locking member, the rear locking member, the lower locking member and the locking member respectively, the seat cushion 10 and the backrest 20 are locked together, the lower leg plate 30 and the pedal 40 are locked together, and the wheel seat 601 and the pedal 40 are locked together. After that, the patient can sit in the wheelchair, which facilitates the transfer of the patient. When the patient needs to lie flat for examination, loosen screw 1 on the front locking member, screw 2 1019 on the rear locking member, screw 3 on the lower locking member, and locking screw 604 on slide 3 603. Then, rotate the backrest 20 away from the seat cushion 10 until it is horizontal. When the backrest 20 is horizontal, slide the rear insertion rods 101 on both sides of the seat cushion 10 so that the rear ends of the rear insertion rods 101 are inserted into the rear insertion tubes 201, preventing the backrest 20 from rotating relative to the seat cushion 10. Next, push the lower leg plate 30 to rotate until it is horizontal. At this time, the front insertion rod 102 on the seat cushion 10 is aligned with the front insertion tube 301 on the lower leg plate 30. Slide the front insertion rod 102 so that the front ends of the front insertion rod 102 are inserted into the front insertion tubes 301, preventing the lower leg plate 30 from rotating relative to the seat cushion 10. Figure 3 , Figure 4 As shown, the backrest 20, seat cushion 10 and leg rest 30 are connected to form a bed board that allows the patient to lie flat.

[0036] When the backrest 20 is rotated away from the seat cushion 10 to make the backrest 20 horizontal, the arc-shaped rack 109 fixedly connected to the backrest 20 rotates, driving the gear 107 to rotate. Then, the straight rack 108 meshing with the gear 107 slides towards the rear end of the seat cushion 10, causing the wheel seat 104 and the large wheel 50 to slide towards the rear end of the seat cushion 10, increasing the distance between the large wheel 50 and the small wheel 60. This can effectively prevent the wheelchair, which has been unfolded into a bed, from tipping over towards the backrest 20.

[0037] When the lower leg plate 30 is rotated to a horizontal position, the slide rod 602 slides relative to the slide seat 603 so that the small wheel 60 is still in contact with the ground. At this time, the slide rod 602 can be locked and fixed on the slide seat 603 by tightening the locking screw 604 to support the lower leg plate 30 and prevent the wheelchair, which has been unfolded into a bed board, from tipping over towards the lower leg.

[0038] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A retractable wheelchair for physical examination, comprising a wheelchair body and a wheel assembly disposed under the wheelchair body, the wheelchair body comprising a seat cushion (10), a backrest (20) rotatably connected to the rear end of the seat cushion (10), and a footrest assembly rotatably connected to the front end of the seat cushion (10), characterized in that: The footrest assembly includes a vertically arranged leg plate (30) and a horizontally arranged pedal (40). The upper end of the leg plate (30) is rotatably connected to the front end of the seat cushion (10), and the lower end of the leg plate (30) is rotatably connected to the pedal (40). The seat cushion (10) is provided with a front locking member for locking the leg plate (30) to the seat cushion (10) and a rear locking member for locking the backrest (20) to the seat cushion (10). Both sides of the seat cushion (10) slide along the front-back direction of the wheelchair. The backrest (20) is provided with a rear insert rod (101) and a front insert rod (102). The backrest (20) is provided with rear insert tubes (201) that cooperate with the rear insert rod (101) on both sides. The calf plate (30) is provided with a front insert tube (301) that cooperates with the front insert rod (102). The wheel set includes large wheels (50) rotatably disposed on both sides of the seat cushion (10) to support the seat cushion (10) and small wheels (60) rotatably disposed on both sides of the pedal (40) to support the pedal (40). The wheelchair body also includes a drive mechanism, which includes a groove (103) disposed on the bottom surface of the seat cushion (10), a wheel seat one (104) slidably connected to the groove (103), a fixing plate (105) fixedly connected to the bottom surface of the seat cushion (10), a wheel seat two (106) fixedly connected to the fixing plate (105), a gear one (107) rotatably mounted on the wheel seat two (106), and a gear fixedly connected to the wheel seat one (104). A straight rack (108) and an arc-shaped rack (109) disposed on the backrest (20) and meshing with the gear one (107) are connected. The rotation axis of the arc-shaped rack (109) is collinear with the rotation axis of the backrest (20) relative to the seat cushion (10). The slide groove (103) is horizontally disposed along the front-rear direction of the seat cushion (10). The fixing plate (105) is disposed near the rear end of the seat cushion (10). The gear one (107) is connected to the straight rack (108) and the arc-shaped rack (109) disposed on the backrest (20) and meshing with the gear one (107). 07) The gear (107) is located on the side of the fixed plate (105) near the rear end of the seat cushion (10). The rotation axis of the gear (107) is horizontally arranged along the left-right direction of the seat cushion (10). The large wheel (50) is rotatably connected to the lower end of the wheel seat (104) through the rotating shaft (1010). The rack (108) is horizontally arranged along the front-back direction of the seat cushion (10). The lower end of the fixed plate (105) is provided with a sliding joint that slides with the rack (108). The sliding hole (1051) is in dynamic engagement. The front end of the rack (108) is fixedly connected to the wheel seat (104). The rear end of the rack (108) passes through the sliding hole (1051) and is located below the gear (107) and meshes with the gear (107). When the backrest (20) is rotated away from the seat cushion (10) and is in a horizontal state, the drive mechanism drives the large wheel (50) to move away from the small wheel (60). The small wheel (60) is mounted on the wheel seat three (601), and the wheel seat three (601) is slidably connected to the pedal (40) through sliding members symmetrically arranged at the left and right ends of the pedal (40); The sliding member includes a slide rod (602) horizontally arranged along the front-rear direction of the seat plate (10), a slide seat three (603) slidably connected to the slide rod (602), and a locking member that locks the slide rod (602) to the slide seat three (603). The slide seat three (603) is fixedly connected to the pedal (40). One end of the slide rod (602) is fixedly connected to the wheel seat three (601), and the other end of the slide rod (602) passes through the slide seat three (603) and is slidably connected to the slide seat three (603).

2. The extendable wheelchair for physical examination according to claim 1, characterized in that: The locking element includes a locking screw (604) disposed radially on the slide block (603) along the slide bar (602).

3. The extendable wheelchair for physical examination according to claim 1, characterized in that: The pedal (40) is provided with a lower locking member that locks the pedal (40) and the lower leg plate (30).

4. The extendable wheelchair for physical examination according to claim 3, characterized in that: The lower locking component includes a support plate three (401) fixedly connected to the lower end side wall of the lower leg plate (30). The support plate three (401) has a through hole three (402) in a direction parallel to the axis of the large wheel (50). The pedal (40) has a screw hole three (403) that mates with the through hole three (402). The screw hole three (403) is internally threaded with a screw three.

5. The extendable wheelchair for physical examination according to claim 1, characterized in that: The front locking component includes a support plate (1013) fixedly connected to the front side wall of the seat plate (10). The support plate (1013) has a through hole (1014) in a direction parallel to the axis of the large wheel (50). The upper end of the lower leg plate (30) has a screw hole (1015) corresponding to the through hole (1014). The screw hole (1015) is internally threaded with a screw rod.

6. The extendable wheelchair for physical examination according to claim 1, characterized in that: The rear locking component includes a support plate two (1016) fixedly connected to the rear side wall of the seat cushion plate (10). The support plate two (1016) has a through hole two (1017) in a direction parallel to the axis of the large wheel (50). The lower end of the backrest (20) is provided with a screw hole two (1018) corresponding to the through hole two (1017). The screw hole two (1018) is internally threaded with a screw rod two (1019).

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