A stretcher

Abstract

The present application discloses a stretcher bed, which comprises a bed body and two support frames, the front and rear ends of the bed body are connected with the upper ends of the support frames respectively, the lower ends of the support frames are provided with walking wheels, the bed body comprises a bed frame, two main supporting plates and at least one bed plate, the bed plate is a plate body with variable length, the front and rear ends of the bed plate are arranged on the main supporting plates respectively, the upper end of each support frame is hinged on a main supporting plate, each support frame is locked through a first locking mechanism, and a mattress is arranged on the bed plate, the mattress is a cushion body with variable length, and each main supporting plate is provided with a movable supporting plate which can extend to the left or right, and the mattress can move along with the movable supporting plate. The bed plate can be retracted, the support frame can be folded, the overall structure is simple and light, convenient to carry and applied to different scenes, and the main supporting plate is further provided with the movable supporting plate, so that the patient can pass the bed conveniently.

Description

Technical Field

[0001] This invention relates to the field of medical emergency equipment technology, specifically to a stretcher bed. Background Technology

[0002] When transporting critically ill patients out of the hospital, it is generally necessary to move the patient onto an ambulance and then transfer them to the hospital. Sometimes, it may even be necessary to transfer the patient to an emergency helicopter. During the process of moving the patient onto or off the ambulance or helicopter, a stretcher is often used for transfer. Traditional stretchers consist of a bed frame with a bed board and guardrails. Their fixed structure takes up a lot of space, making them inconvenient for transport and storage. Furthermore, these stretchers have relatively limited functionality and often fail to adequately meet diverse usage needs.

[0003] Currently, to facilitate the transfer and storage of stretcher beds and improve their applicability, many new technologies for improving stretcher beds have emerged in the market. For example, an invention with publication number CN106473869B discloses a medical stretcher, which mainly includes a stretcher body 1, a front handle 2, a fixing buckle 6, a rear handle 7, and a stretcher cart 9. The stretcher body 1 includes three support frames 101, each of which is slidably connected to the other via a support frame telescopic rod 5. Fixing buckles 6 are provided at both ends of the stretcher body 1. By releasing the fixing buckles 6 and then engaging the telescopic rod 5, the stretcher can be folded and retracted, making it convenient to carry and store. The stretcher body 1 is connected to the stretcher cart 9 via a slot 4 and a buckle 8, allowing the stretcher to accommodate long-distance horizontal movement of the patient. This structure makes the stretcher no longer a fixed structure, thus allowing it to be folded and retracted, reducing space occupation, and can be installed on the stretcher cart 9 for use in different scenarios. However, only the main body of the stretcher 1 can be folded and retracted, while the stretcher cart 9 remains fixed, which cannot save space well. Moreover, in many cases, the main body of the stretcher 1 and the stretcher cart 9 need to be used separately, which makes it still relatively troublesome and limited in use.

[0004] For example, an invention with publication number CN 111658340 B discloses an active retractable stretcher for emergency care, which mainly includes a long plate 1, a hinged rod 2, rollers 3, a folding mechanism 4, and a locking mechanism 5. The folding mechanism 4 includes a guide rod 41, a first spring 42, a guide sleeve 43, a connecting rod 44, and a cross plate 45. The locking mechanism 5 includes a first sliding sleeve 52, a first sliding rod 51, a rack 53, a square hole sleeve 54, a square rod 55, a contact wheel 56, a limiting toothed plate 57, a second spring 58, and a connecting frame 59. In use, the stretcher is taken out of the ambulance. Under the action of the first spring 42, the hinged rod 2 unfolds, and the rollers 3 contact the ground. Under the action of the second spring 58, the rack 53 moves downward to lock the limiting toothed plate 57, thereby locking the hinged rod 2. The whole unit can then be used as a transport vehicle to transport patients. After the stretcher is moved into the ambulance, the contact wheel 56 contacts the bottom of the ambulance and provides support. The second spring 58 is compressed, and the limiting tooth plate 57 also moves downward, so that the limiting tooth plate 57 is no longer stuck by the rack 53. At this time, the hinge rod 2 can be pushed to swing and fold along the hinge point, and the first spring 42 is compressed again. This structure allows the stretcher to be used as a transfer cart when leaving the ambulance and can be folded up when entering the ambulance. However, after leaving the ambulance, it can only remain unfolded as a stretcher cart. Its hinge rod and long plate 1 cannot be temporarily folded to change size according to actual use, which has a large limitation.

[0005] For example, an invention with publication number CN109431696B discloses an emergency stretcher, which mainly includes a stretcher cloth 1, stretcher poles 2, pole frame plates 3, handles 4, a width adjustment mechanism 5, a flipping wheel mechanism 6, and a flipping support mechanism 7. The width adjustment mechanism 5 adjusts the distance between the two stretcher poles 2 and the two pole frame plates 3. The stretcher cloth 1 is made of a fabric with a certain degree of elasticity, so it can be contracted or unfolded accordingly, thereby changing the size of the overall structure. The flipping wheel mechanism 6 flips so that the traveling wheels 6-5 are in contact with the ground, and the flipping support mechanism 7 flips so that the support block 7-7 is in contact with the ground, so that the whole can be used as a trolley-type stretcher. This structure combines the stretcher bed and the stretcher cart into a whole, which can be contracted and folded together for easy carrying and transportation, and can also be unfolded at the same time for use as a trolley-type stretcher, thus saving space and improving applicability. However, its width adjustment mechanism 5, tilting wheel mechanism 6, and tilting support mechanism 7 have too many components, which can easily result in a heavy stretcher. In addition, the connection and transmission structure of each part is relatively complex, making operation inconvenient and prone to jamming. Furthermore, when used as a trolley stretcher, it relies on only one traveling wheel 6-5 on the tilting wheel mechanism 6 for support and movement, which results in insufficient stability during movement and a risk of tipping over.

[0006] In summary, while ensuring that the overall structure can be safely folded or resized according to the usage scenario and needs, how to achieve lightweight and simplification of stretcher beds with trolley functions is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a stretcher bed that overcomes the shortcomings of existing stretcher beds with trolley functions, which have a complex overall structure and are heavy, while ensuring that the overall structure can be folded or changed in size according to the usage scenario and needs.

[0008] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0009] A stretcher bed includes a bed frame and two support frames. The front and rear ends of the bed frame are each connected to the upper end of one of the support frames. Each support frame has a pair of left-right distributed wheels at its lower end. The bed frame includes: a bed frame with two main support plates and at least one bed board. The bed board is a board whose length in the front-rear direction can be changed, and each bed board has its front and rear ends respectively attached to one of the main support plates. The upper end of each support frame is hinged to one of the main support plates. Each support frame is capable of flipping upwards and is locked by a first locking mechanism. A mattress is disposed on the bed board and is a cushion body whose length in the front-rear direction can be changed.

[0010] Preferably, in the above technical solution, each bed board includes a mother board and a daughter board. The mother board has a cavity, one end of which is fixed to a main support plate, and the other end of which has a cavity opening communicating with the cavity. One end of the daughter board is inserted into the cavity through the cavity opening in a way that allows it to slide back and forth. The other end of the daughter board is fixed to another main support plate. After the positions of the daughter boards of all the bed boards are adjusted, they are locked by a second locking mechanism.

[0011] Preferably, in the above technical solution, at least one of the bed boards is a locking bed board; the mother plate of the locking bed board is provided with a cavity side hole on the side wall of the cavity opening, and the sub-plate of the locking bed board is provided with a plurality of sub-plate holes from front to back, and the sub-plate of the locking bed board can slide in the front-back direction until any one of the sub-plate holes is aligned with the cavity side hole; the second locking mechanism is a bed board locking pin, and each cavity side hole on the mother plate of the locking bed board is provided with a bed board locking pin, and the bed board locking pin can be inserted into the sub-plate hole aligned with the cavity side hole on the sub-plate.

[0012] Preferably, in the above technical solution, the mattress is a mattress body with several fold seams from front to back, so that its length in the front-to-back direction can be changed by folding.

[0013] Preferably, in the above technical solution, each of the fold seams on the mattress is a cross-sectional seam, and the cross-sectional seams are connected by connectors.

[0014] Preferably, in the above technical solution, each of the main support plates has a hinge shaft with its axis distributed in the left-right direction mounted on its bottom in a rotatable manner, and the upper end of the support frame is fixed on the hinge shaft; the hinge shaft is locked by the first locking mechanism.

[0015] Preferably, in the above technical solution, the first locking mechanism includes: a sliding block, which is mounted on the bottom of the main support plate in a manner that allows it to move left and right, and the sliding block is provided with a positioning groove; and a positioning seat, which is fixed on the hinge shaft, and the positioning seat is provided with two positioning blocks circumferentially along the rotation direction of the hinge shaft; when the hinge shaft rotates to the point where one of the positioning blocks is aligned with the positioning groove, the support frame is vertically distributed; when the hinge shaft rotates to the point where the other positioning block is aligned with the positioning groove, the support frame is folded upward; the sliding block can move to the positioning groove to lock the positioning block aligned with it.

[0016] Preferably, in the above technical solution, the walking wheel is a wheel capable of walking along stairs.

[0017] Preferably, in the above technical solution, each of the main support plates is provided with a movable support plate that can extend to the left or right, and the mattress can move along with the movable support plate; when the movable support plate is retracted, it is locked by a third locking mechanism.

[0018] Preferably, in the above technical solution, the number of bed boards is at least two, and when the movable support plate extends to the left or right, at least one of the bed boards remains in the same position.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The bed board of the present invention can change its length in the front and back directions to be extended or shortened as needed, and the support frame can be folded. The overall size and space occupied can be flexibly adjusted. It can be used as a stretcher that can be lifted manually or as a transport vehicle. The overall structure is relatively simple and lightweight, making it convenient to carry and apply to different scenarios.

[0021] 2. The bed board of the present invention is a structure in which the sub-board can be slidably inserted into the cavity of the mother board. Combined with the fact that at least one bed board can be a locking bed board, and the matching second locking mechanism is a bed board locking pin, the structure is further simplified and the weight is reduced.

[0022] 3. The mattress of the present invention changes its length in the front-to-back direction by setting fold seams, which is more convenient to use. Furthermore, the fold seams are made into cross-sectional seams and connected by connectors, so that the mattress can not only adjust its length by folding or unfolding, but also by separating or connecting from the fold seams, making it more flexible and convenient to use.

[0023] 4. The first locking mechanism of the present invention includes a sliding block with a positioning groove and a positioning seat with two positioning blocks. By locking different positioning blocks in the positioning groove, the support frame can be locked in a vertical position or a folded position. The overall structure is simple and lightweight, and it is also relatively easy to adjust.

[0024] 5. The main support plate of the present invention is also provided with a movable support plate that can extend to the left or right, and the mattress can move accordingly, thereby facilitating the patient's transfer to the bed. It can also flexibly adjust the width of the overall structure as needed, further improving its applicability to different scenarios. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the stretcher bed according to the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the stretcher bed after the mattress has been removed according to the present invention.

[0027] Figure 3 This is a schematic diagram of the bed board and the second locking mechanism of the stretcher bed according to the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of the stretcher bed according to the present invention, in which the support frame is mounted on the main support plate.

[0029] Figure 5 This is a schematic diagram of the structure of the sliding block of the first locking mechanism of the stretcher bed according to the present invention after the positioning slot of the sliding block is separated from the positioning block of the positioning seat.

[0030] Figure 6 This is a schematic diagram of the main support plate and the third locking mechanism of the stretcher bed according to the present invention.

[0031] Explanation of key figure labels:

[0032] 1-Bed Body

[0033] 11-Main support plate, 111-Modible support plate, 112-Connecting seat, 113-Connecting pin, 114-Connecting hole, 115-Hinge seat; 12-Bed board, 121-Main board, 122-Sub-board, 123-Sub-board hole, 124-Bed board locking pin, 125-Side hole in board cavity; 13-Mattress, 131-Folding seam; 14-Armband ring; 15-Auxiliary support plate

[0034] 2-Support Frame

[0035] 21-Walking wheel; 22-Support column; 23-Reinforcing rod; 24-Hinge shaft; 241-Positioning seat; 242-Positioning block; 243-Sliding block; 244-Fixing block; 245-Pull rod; 246-Spring; 247-Pull ring. Detailed Implementation

[0036] The following detailed description of specific embodiments is provided in conjunction with the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0037] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0038] refer to Figures 1 to 6 This invention provides a stretcher bed, comprising a bed frame 1 and two support frames 2. The front and rear ends of the bed frame 1 are each connected to the upper end of a support frame 2, and each support frame 2 has a pair of left-right distributed wheels 21 at its lower end. Preferably, the wheels 21 are wheels capable of moving along stairs, and their specific structure can be a star-wheel structure with three wheels respectively distributed at the vertices of the same equilateral triangle. The stretcher bed can move up and down stairs via the wheels 21, making it convenient to enter and rescue people in old houses without elevators.

[0039] refer to Figure 1 and Figure 2The bed frame 1 includes a bed frame and a mattress 13. The bed frame includes two main support plates 11 and at least one bed board 12. The bed board 12 is a board whose length in the front-to-back direction can be changed, and each bed board 12 is mounted on a main support plate 11 at both its front and rear ends. By changing the length of the bed board 12, the length of the bed frame and the space occupied can be adjusted. Each main support plate 11 has a handrail ring 14 at both its left and right ends to facilitate pushing, pulling, or lifting the stretcher bed. It can also be used to hoist the stretcher bed onto the ropes lowered by the emergency helicopter for transfer to the emergency helicopter. The upper end of each support frame 2 is hinged to a main support plate 11, allowing each support frame 2 to flip upwards. Each support frame 2 is locked by a first locking mechanism. When the first locking mechanism is released, the position of the support frame 2 can be adjusted. After adjustment, the first locking mechanism can lock the support frame 2 in the current position. The mattress 13 is placed on the bed board 12. The mattress 13 is a pad that can change its length in the front-to-back direction so that the length of the mattress 13 can be adjusted accordingly according to the length of the bed board 12 to ensure a good fit.

[0040] The bed board 12 may include several U-shaped boards that can be movably stacked together, thereby adjusting the overall length of the bed board 12 by changing the amount of overlap between any two adjacent U-shaped boards. This structure is generally weight-oriented. Preferably, the present invention refers to... Figure 2 and Figure 3 Each bed board 12 includes a mother board 121 and a daughter board 122. The mother board 121 is a hollow board with a cavity. One end of the mother board 121 is fixed to a main support plate 11, and the other end of the mother board 121 has a cavity opening communicating with the cavity. One end of the daughter board 122 is inserted into the cavity of the mother board 121 through the cavity opening in a way that allows it to slide back and forth. The other end of the daughter board 122 is fixed to another main support plate 11. Specifically, the other end of the daughter board 122 can be set on the main support plate 11 through a daughter board head, and the upper surface of the daughter board head is on the same plane as the upper surface of the mother board 121. By adjusting the length of the daughter board 122 extending into the cavity of the mother board 121, the length of the entire bed board 12 in the front-back direction can be changed. After the positions of the daughter boards 122 of all the bed boards 12 are adjusted, they are locked by a second locking mechanism.

[0041] refer to Figure 2 and Figure 3In a further preferred embodiment of the present invention, at least one bed board 12 is selected as the locking bed board. The mother plate 121 of the locking bed board 12 has a cavity side hole 125 on the side wall of the cavity opening, and the daughter plate 122 of the locking bed board has a plurality of daughter plate holes 123 from front to back. The daughter plate 122 of the locking bed board can slide in the front-back direction until any one of the daughter plate holes 123 is aligned with the cavity side hole 125. Generally, the cavity side hole 125 is opened on one side of the cavity opening, and correspondingly, the daughter plate holes 123 are opened on one side of the left and right sides of the daughter plate 122. The second locking mechanism is a bed board locking pin 124. Each locking bed board mother plate 121 has a bed board locking pin 124 provided in the cavity side hole 125, and the bed board locking pin 124 can be inserted into the daughter plate hole 123 on the daughter plate 122 that is aligned with the cavity side hole 125. The bed plate locking pin 124 can be a resilient pin, which can be inserted into or removed from the sub-plate hole 123 by insertion and removal, thereby locking or loosening the sub-plate 122. Alternatively, the bed plate locking pin 124 can also be a bolt, with the corresponding plate cavity side hole 125 being a screw hole that engages with the bed plate locking pin 124, so that the bed plate locking pin 124 can be inserted into or removed from the sub-plate hole 123 by rotation, thereby locking or loosening the sub-plate 122.

[0042] refer to Figure 2 and Figure 3 To achieve a lightweight structure, the bed board 12 is typically not a large board covering the entire bed frame, but rather a small board, with multiple small board-shaped bed boards 12 spaced apart on the left and right. When using a structure with multiple bed boards 12, an auxiliary support plate 15 can also be set between two main support plates 11. One end of the mother board 121 is fixed to one of the main support plates 11, and the other end of the mother board 121 is fixed to one of the auxiliary support plates 15 to improve structural stability and make the structure more robust and reliable. Specifically, this invention employs three small, plate-shaped bed boards 12 spaced apart on the left, middle, and right. In this configuration, to improve the reliability and stability of the second locking mechanism, the left and right bed boards 12 are selected as locking bed boards, while the middle bed board 12 is not required. Furthermore, the sub-plate holes 123, bed board locking pins 124, and plate cavity side holes 125 of the left bed board 12 are located on the left side, while those of the right bed board 12 are located on the right side. This arrangement makes it easier for the operator to see and operate. The bed board 12 of this invention has a sub-plate 122 that can slide back and forth into the plate cavity of the mother plate 121. Combined with the fact that at least one bed board 12 can be used as the locking bed board, and the corresponding second locking mechanism is the bed board locking pin 124, the structure is further simplified and the weight reduced.

[0043] refer to Figure 1Preferably, the mattress 13 of this invention is a mattress body with a plurality of fold seams 131 arranged from front to back, the fold seams 131 being distributed along the left-right direction. The front and rear parts of the mattress 13 can be folded 180 degrees relative to each other to overlap, thereby changing its length along the front-back direction by folding. The folded part becomes higher and can also be used as a headrest as needed. More preferably, each fold seam 131 on the mattress 13 is a section seam, that is, the mattress 13 is broken at the fold seam and then the section seam is connected by a connector, such as Velcro or a zipper. The section seam 131 allows the mattress 13 to be folded or unfolded in sections to change its overall length along the front-back direction, which is often used when the bed board 12 is still in a relatively long position. It can also be changed by removing or attaching sections to change the overall length along the front-back direction, which is often used when the bed board 12 needs to be shortened. The mattress 13 of the present invention changes its length in the front-to-back direction by setting a folding seam 131, and further makes the folding seam 131 a cross-sectional seam and then connects it with a connector. In this way, in addition to adjusting the length by folding or unfolding, the length can also be adjusted by separating or connecting from the folding seam, making it more flexible and convenient to use.

[0044] refer to Figure 2 , Figure 4 and Figure 5Preferably, each main support plate 11 has a hinge shaft 24 with its axis distributed in the left-right direction mounted on its bottom. The upper end of the support frame 2 is fixed to the hinge shaft 24 so that it can rotate with the hinge shaft 24. The hinge shaft 24 is locked by a first locking mechanism. By controlling the locking or unlocking of the hinge shaft 24, the support frame 2 can be controlled, which greatly simplifies the structure and facilitates operation. More preferably, the first locking mechanism includes a positioning seat 241 and a sliding block 243. The sliding block 243 is mounted on the bottom of the main support plate 11 in a left-right movable manner and is provided with a positioning slot. The positioning seat 241 is fixed to the hinge shaft 24, and two positioning blocks 242 are provided on the positioning seat 241 in the circumferential direction along the rotation direction of the hinge shaft 24. The positioning blocks 242 correspond to the positioning slots on the sliding blocks 243. The hinge shaft 24 can be rotated until any one of the positioning blocks 242 is aligned with the positioning slot. When the hinge shaft 24 rotates until one of the positioning blocks 242 aligns with the positioning slot, the support frame 2 is vertically positioned. When the hinge shaft 24 rotates until the other positioning block 242 aligns with the positioning slot, the support frame 2 folds upwards. The two positioning blocks 242 can be positioned 90 degrees apart, so that when the support frame 2 folds upwards, it is horizontally positioned and parallel to the bed board 12. The sliding block 243 can move to the positioning slot to engage the aligned positioning block 242, preventing the hinge shaft 24 from rotating and thus locking it. After moving the sliding block 243 to separate the positioning slot from the positioning block 242, the hinge shaft 24 is released again, allowing it to rotate and adjust the position of the support frame 2. The first locking mechanism of this invention can lock the support frame 2 in a vertical or folded position by engaging different positioning blocks 242 in the positioning slot. The overall structure is simple, lightweight, and easy to adjust.

[0045] The specific structure and connection method of the main support plate 11, the support frame 2 and the first locking mechanism can be described as follows: Figure 4 and Figure 5As shown, a hinge seat 115 protrudes downwards from each of the left and right ends of the bottom surface of the main support plate 11. Both ends of the hinge shaft 24 are rotatably mounted on a hinge seat 115. The support frame 2 includes two wheels 21, two support columns 22, and a reinforcing rod 23. The two support columns 21 are distributed opposite each other, and the two support columns 22 are connected by the reinforcing rod 23 to improve structural stability. Each of the two wheels 21 is located at the lower end of one support column 21. Specifically, an axle can be mounted at the lower end of the two support columns 22, and each of the two wheels 21 is located at one end of the axle. Each hinge seat 115 is provided with an L-shaped clamp. The L-shaped clamp of the hinge seat 115 on the front main support plate 11 faces downward and rearward. Correspondingly, the upper ends of the two support columns 22 of the front support frame 2 are each movably locked in the L-shaped clamp of the hinge seat 115 and fixed to the hinge shaft 24. The L-shaped clamp of the front main support plate 11 blocks the upper ends of the support columns 22 of the front support frame 2 for limitation. The front support frame 2 can only swing forward to a vertical position at most, and can swing backward to a horizontal position, so that it is parallel to the bottom of the bed board 12. Similarly, the L-shaped clamp of the hinge seat 115 on the rear main support plate 11 faces downward and forward to block the upper ends of the support columns 22 of the rear support frame 2 for limitation. The rear support frame 2 can only swing backward to a vertical position at most, and can swing forward to a horizontal position, so that it is parallel to the bottom of the bed board 12. The first locking mechanism, in addition to the positioning seat 241 and the sliding block 243, also includes a fixing block 244, a pull rod 245, a spring 246, and a pull ring 247. The positioning seat 241 is located in the middle of the hinge shaft 24. The pull rod 245 passes through a hinge seat 115 in a manner that allows it to move left and right. The sliding block 243 is located at the end of the pull rod 245 near the positioning seat 241, and the pull ring 247 is located at the other end of the pull rod 245. The spring 246 is sleeved on the pull rod 245 and clamped between the sliding block 243 and the hinge seat 115 through which the pull rod 245 passes. In its natural state, the spring 246 presses the sliding block 243 against its positioning slot, locking it in place with the aligned positioning block 242. When the position of the support frame 2 needs to be changed, the pull rod 245 is pulled by the pull ring 247 to overcome the elastic force of the spring 246, causing the positioning slot of the sliding block 243 to separate from the positioning block 242, and the support frame 2 can then rotate together with the hinge shaft 24. The pull rod 245 can be a square rod or a hexagonal rod, etc., which passes through the hole of the same shape opened on the hinge seat 115, so that the sliding block 243 can only move left and right and cannot rotate.If, for ease of processing and installation, the pull rod 245 is made of round rod, which passes through the corresponding round hole opened on the hinge seat 115, in this state, to prevent the positioning slot of the sliding block 243 from being difficult to align with the positioning block 242 due to the rotation of the pull rod 245, a fixing block 244 can be fixedly mounted below the main support plate 11. The positioning seat 241 is located between the fixing block 244 and the sliding block 243. When any one of the positioning blocks 242 on the positioning seat 241 is vertically distributed upwards, it is aligned with the fixing block 244. The sliding block 243 can move to the positioning slot and simultaneously lock the positioning block 242 and the fixing block 244.

[0046] The overall structure of the bed frame 1 and support frame 2 of this invention is relatively simple, and the cooperation and connection between components have been simplified as much as possible. Each major component can also be made of lightweight materials such as aluminum to achieve weight reduction. When the bed board 12 of the bed frame 1 is extended, the distance between the two main support plates 11 increases, making it suitable for taller patients. When the bed board 12 is shortened, the distance between the two main support plates 11 decreases, making it suitable for shorter patients. When the bed board 12 is retracted to its shortest length, the space occupied by the entire bed frame is greatly reduced. The two support frames 2 can be flipped upwards and folded to be basically parallel to the bed board 12, the wheels 21 are retracted, and then locked by the first locking mechanism. The entire stretcher bed then becomes a conventional stretcher, requiring manual lifting, making it suitable for use in confined spaces and rugged terrain. The first locking mechanism is released, causing the two support frames 2 to flip downwards to a vertical position. They are then re-locked via the first locking mechanism, and the entire bed frame is supported by the two support frames 2. The frame can then move via the wheels 21 of the support frames 2, allowing it to be used directly as a transport vehicle for quick patient transfer in spacious and easily accessible locations. Therefore, the bed board 12 of the bed frame 1 of this invention can change its length in the front-to-back direction to extend or shorten as needed, and the support frames 2 are foldable. The overall size and space occupied can be flexibly adjusted, allowing it to be used as a stretcher for manual lifting or as a transport vehicle. The overall structure is simple and lightweight, making it easy to carry and apply in different scenarios.

[0047] refer to Figure 2 and Figure 6Furthermore, each main support plate 11 is provided with a movable support plate 111 that can extend to the left or right, and the mattress 13 can move along with the movable support plate 111. The mattress 13 can be placed directly on all the bed boards, or it can be connected to the movable support plate 111 via Velcro or other connectors. To improve the stability and safety of the transfer process, when the movable support plate 111 is retracted, it needs to be locked by a third locking mechanism. The main support plate 11 and the movable support plate 111 can also adopt a structure similar to that of the bed board 12, with the main support plate 11 acting as the mother board and the movable support plate 111 acting as the daughter board, and the third locking mechanism can adopt the same structure as the first locking mechanism. If an auxiliary support plate 15 is provided, the auxiliary support plate 15 is also provided with a movable support plate 111. The extendable movable support plate 111 can change the width of the entire stretcher bed, improving its applicability. Secondly, the movable board 111 extends along with the mattress 13, allowing it to be inserted behind the back of a lying patient for easy transfer to a stretcher. Alternatively, the movable board 111, along with the mattress 13 and the patient, extends above the hospital bed or operating table for easy transfer. Preferably, there are at least two bed boards 12, ensuring that at least one bed board 12 remains in place when the movable board 111 extends to the left or right, thus guaranteeing structural stability. In normal use, in addition to the mattress 13, the movable support plate 111 will also move at least one bed board 12 together. In this case, the third locking mechanism may specifically include a connecting seat 112 and a connecting pin 113. One end of the connecting seat 112 is fixed to the bed board 12, which remains in a fixed position, and the connecting pin 113 is fixed to the other end of the connecting seat 112. A connecting hole 114 is correspondingly provided on a bed board 12 that moves with the movable plate 111. When the movable support plate 111 is retracted to its limit position, the connecting hole 114 is aligned with the connecting pin, and the movable plate 111 is locked by inserting the connecting pin 113 into the connecting hole 114. For example, when three bed boards 12 are provided (left, center, and right), two bed boards 12 can be fixed on the main support plate 11 and remain in a fixed position, while the other bed board 12 is set on the movable support plate 111 and moves with it. The front and rear ends of the middle bed board 12 are each connected to one end of a connecting seat 112, and the other end of each of the two connecting seats 112 is provided with a connecting pin 113. The front and rear ends of the bed board 12 that moves with the movable support plate 111 are each provided with a connecting hole 114 corresponding to the connecting pin 113 on the same side. Thus, bidirectional locking can be achieved by simultaneously inserting the two connecting pins 113 into the corresponding connecting holes 114, thereby improving stability and safety. The main support plate 11 of this invention is also provided with a movable support plate 111 that can extend to the left or right, and the mattress 13 can move accordingly, thus facilitating patient transfer and allowing for flexible adjustment of the overall structure width as needed, further improving applicability to different scenarios.

[0048] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A stretcher bed, comprising a bed frame and two support frames, wherein the front and rear ends of the bed frame are each connected to the upper end of one of the support frames, and each support frame is provided with a pair of left-right distributed wheels at its lower end, characterized in that, The bed body includes: A bed frame includes two main support plates and at least one bed board, each bed board being a board whose length in the front-to-back direction can be changed, with each bed board having its front and rear ends respectively disposed on one of the main support plates; the upper end of each support frame is hinged to one of the main support plates, each support frame is capable of being flipped upwards, and each support frame is locked by a first locking mechanism; and A mattress, which is set on the bed board, is a pad that can change its length in the front-to-back direction.

2. The stretcher bed according to claim 1, characterized in that, Each bed board includes a mother board and a daughter board. The mother board has a cavity. One end of the mother board is fixed to a main support plate, and the other end of the mother board has a cavity opening that communicates with the cavity. One end of the daughter board is inserted into the cavity through the cavity opening in a way that allows it to slide back and forth. The other end of the daughter board is fixed to another main support plate. After the positions of the daughter boards of all the bed boards are adjusted, they are locked by a second locking mechanism.

3. The stretcher bed according to claim 2, characterized in that, At least one of the bed boards is a locking bed board; the mother plate of the locking bed board is provided with a cavity side hole on the side wall of the cavity opening, and the sub-plate of the locking bed board is provided with a plurality of sub-plate holes from front to back, and the sub-plate of the locking bed board can slide in the front-back direction until any one of the sub-plate holes is aligned with the cavity side hole; The second locking mechanism is a bed board locking pin. Each locking bed board has a bed board locking pin provided in the side hole of the plate cavity on the mother plate, and the bed board locking pin can be inserted into the sub-plate hole that is aligned with the side hole of the plate cavity on the sub-plate.

4. The stretcher bed according to claim 1, characterized in that, The mattress is a pad with several folds from front to back, so that its length in the front-to-back direction can be changed by folding.

5. The stretcher bed according to claim 4, characterized in that, Each of the folds on the mattress is a cross-sectional seam, and the cross-sectional seams are connected by connectors.

6. The stretcher bed according to claim 1, characterized in that, Each of the main support plates has a hinge shaft at its bottom that is rotatably mounted with its axis distributed in the left-right direction, and the upper end of the support frame is fixed to the hinge shaft; the hinge shaft is locked by the first locking mechanism.

7. The stretcher bed according to claim 6, characterized in that, The first locking mechanism includes: A sliding block, which is mounted on the bottom of the main support plate in a manner that allows it to move left and right, is provided with a positioning slot; and A positioning seat is fixed on the hinge shaft, and two positioning blocks are arranged circumferentially along the rotation direction of the hinge shaft on the positioning seat. When the hinge shaft rotates to the point where one of the positioning blocks aligns with the positioning slot, the support frame is vertically distributed. When the hinge shaft rotates to the point where the other positioning block aligns with the positioning slot, the support frame folds upward. The sliding block can move to the positioning slot to lock the positioning block that aligns with it.

8. The stretcher bed according to claim 1, characterized in that, The walking wheels are wheels that can travel up stairs.

9. The stretcher bed according to claim 1, characterized in that, Each of the main support plates is provided with a movable support plate that can extend to the left or right, and the mattress can move along with the movable support plate; when the movable support plate is retracted, it is locked by a third locking mechanism.

10. The stretcher bed according to claim 9, characterized in that, The number of bed boards is at least two, and at least one of the bed boards remains in the same position when the movable support extends to the left or right.

Images