Adjustable bendable stretcher for easy passage through narrow right-angled corners

Abstract

The application provides a bendable adjustable life-saving stretcher which can conveniently pass through a narrow right-angled corner channel, and can effectively and quickly pass through a right-angled corner channel. The stretcher comprises a stretcher frame, a stretcher cloth and a support connecting and contracting support part which are arranged around the inner side of the stretcher frame. The stretcher frame comprises two stretcher rods, each of which is connected by a plurality of connecting rods through a connecting adapter, and a hinge assembly is further arranged in the middle part of each stretcher rod. A stretcher cloth is arranged between the two stretcher rods, and the two sides of the stretcher cloth are sleeved on the two stretcher rods. The front and rear end parts of the stretcher cloth are provided with reinforced support cloth. The two stretcher rods are connected through the support connecting and contracting support part, and the support connecting and contracting support part is a support and folding structure of the stretcher frame. The two ends of the stretcher rod are respectively connected with the stretcher rod through a recessed groove fixed pin.

Description

Technical Field

[0001] This invention relates to a stretcher, and more particularly to a flexible and adjustable life-saving stretcher that allows for easy passage through narrow right-angle bends. Background Technology

[0002] In complex marine environments, ships may be subjected to unexpected collisions, high-pressure waves, or fuel explosions during navigation, seriously threatening the safety of personnel on board. Vertical upward impacts are particularly severe, causing varying degrees of injury. Therefore, comprehensive personnel rescue capabilities are urgently needed to provide timely medical treatment to the wounded during combat operations and ensure the safety of personnel.

[0003] Compared to regular terrain, ship passageways have unique features such as narrow corridors and stairwells. Therefore, stretchers used to transport the injured on board a ship should be able to pass smoothly through the ship's narrow right-angled stairwells under the operator's control. Conventional stretchers that use handles for transport are often unsuitable for the ship's environment because their length and width are too large and their functions are limited, making it difficult to enter the cabins and pass through the ship's narrow passageways.

[0004] Specialized stretchers have been designed to meet the needs of shipboard emergency medical care. While conventional pole stretchers are more convenient to use in larger spaces and can accommodate patients of varying sizes, these stretchers consist of a flexible stretcher fabric and multiple rigid support rods embedded longitudinally within it. To use them, the patient is first placed on the stretcher, then the adjustable straps tighten the sides to enclose the patient, and finally, the patient is transported using the conventional poles located on the sides or front and back. Compared to rigid pole stretchers, these offer some flexibility, but they can place a significant physical burden on the transporter, especially when navigating stairs or corners where adjustments to the patient's position are necessary. This may require the patient to be removed from the stretcher, reducing transport efficiency and potentially delaying emergency care. Summary of the Invention

[0005] The purpose of this invention is to solve some of the problems existing in the prior art and to provide a flexible and adjustable rescue stretcher that can easily pass through narrow right-angle turns, and can effectively and quickly pass through right-angle turns.

[0006] In order to achieve the above objectives,

[0007] A flexible and adjustable life-saving stretcher that allows easy passage through narrow right-angle turns, comprising a stretcher frame, a stretcher cloth surrounding the inside of the stretcher frame, and a support and retractable bracket.

[0008] The stretcher frame includes two stretcher poles, each stretcher pole is connected by multiple connecting rods through a connecting adapter, and each stretcher pole is also provided with a hinge assembly in the middle part;

[0009] A stretcher cloth is placed between the two stretcher poles, and the stretcher cloth is wrapped around the two stretcher poles on both sides. The front and rear ends of the stretcher cloth have reinforcing support fabric.

[0010] The two stretcher poles are connected by the bracket connecting the retractable support section, which is the support and folding structure of the stretcher frame.

[0011] The two ends of the stretcher pole are respectively connected to the stretcher pole handshake through grooved fixing pins.

[0012] The adapter includes a front claw and a rear claw; the front claw and the rear claw are surrounded by multiple layers of connecting claws, and the front claw and the rear claw are hinged by a pin; the two ends of the adapter are respectively provided with limiting grooves for connecting and fixing with the connecting rod.

[0013] The support frame has support seats at both ends of the retractable part. The sleeve of the support seat is fitted onto the connecting rod. The support seat is fixed with a fixing pin in the central limiting hole of the outer part of the support frame. The support leg is installed below the support seat. The support seat and the support leg are hinged and are also provided with fixing pins.

[0014] The connecting seat is longitudinally hinged to the support leg, and the side of the support leg close to the connecting seat is triangular, with the positioning bolt connected to the connecting seat for positioning and rotation.

[0015] A pair of connecting seats are hinged together by a connecting block, wherein the connecting block has limit holes on both sides to facilitate the connecting block to rotate on the connecting seat, and the bracket leg and the connecting seat are installed below the bracket seat.

[0016] The hinge assembly includes multiple hinge blocks connected sequentially by pins; the rear end of the hinge assembly is fixed to an adapter via a connecting sleeve, wherein the adapter and connecting sleeve are connected to the inwardly rotating part of the support leg and drive the hinge blocks to rotate; the concave interface at the front end of the connecting block is embedded with the protrusion of the hinge block, wherein the front end of the hinge block protrusion has a certain arc and is a distance from the concave interface at the front end of the connecting block to facilitate the rotation of the hinge block protrusion; the hinge blocks are connected to each other by pins to enable their rotation; the inner interface of the hinge block is embedded with the protrusion of the next hinge block and connected sequentially by pins.

[0017] The connecting rod is embedded in the hinge front sleeve. The connecting rod is secured to the hinge front end by a limiting ring. The circular sliding structure at the hinge front end can slide along the connecting rod. The circumferential limiting hole of the hinge front sliding structure and the limiting hole of the connecting rod are fixed with a fixing pin.

[0018] The hinge assembly is covered with a flexible protective sleeve, and is fixed to the connecting rod and adapter by a limiting ring and a limiting screw.

[0019] The hinge assembly includes seven hinge blocks connected in sequence; each stretcher has four support legs and four support seats, and each stretcher pole has three adapters.

[0020] The front end of the stretcher handle is connected to the end cap and fixed with the limiting groove. The diameter of the groove on the end cap is smaller than that of the corresponding stretcher handle. The stretcher handle and the connecting rod at the end of the stretcher handle have an intersection part. The diameter of the stretcher handle is smaller than that of the connecting rod. The stretcher handle extends into the connecting rod and is limited by the connecting sleeve with the same size limiting hole. It is then limited and fixed with a limiting screw.

[0021] This invention determines the length, width, and connecting rod diameter of the stretcher based on the width of the narrow passageway on the ship. The length and width of the stretcher are determined when the maximum bending of the stretcher is °. The diameter of the stretcher frame tube is calculated when the weight of the personnel is limited by the stretcher.

[0022] Specifically, when designing the length and width of the stretcher, the following relationship should be satisfied when the stretcher's bending adjustment angle is 45°:

[0023]

[0024] Where A is the stretcher length, X is the stretcher width, and L is the width of the ship passageway.

[0025] The diameter of the stretcher frame tubes is determined by simplifying the design based on the required weight F of the stretcher bearer, where the stretcher represents the weight of the bearer, and the following relationship is satisfied.

[0026]

[0027] Where D is the outer diameter of the connecting rod, A is the stretcher length, n is the safety factor of the connecting rod, and σ n The ultimate stress of the connecting rod is the material limit stress. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention for use in narrow passageways of ships.

[0029] Figure 2 This invention relates to the design process of a flexible and adjustable life-saving stretcher that allows for convenient passage through narrow right-angle bends.

[0030] Figure 3 This is a frontal schematic diagram of the stretcher of the present invention.

[0031] Figure 4 A schematic diagram of the back of the stretcher of this invention.

[0032] Figure 5 A schematic diagram of the adapter in the stretcher of this invention.

[0033] Figure 6A schematic diagram of the hinge assembly in the stretcher of this invention.

[0034] Figure 7 A schematic diagram of the main frame structure of the stretcher of this invention after folding.

[0035] The correspondence between component names and drawing numbers in the diagram is as follows:

[0036] 1. Stretcher fabric; 101. Reinforced support fabric; 2. Adapter; 201. Adapter front claw; 202. Adapter rear claw; 3. Stretcher pole handle; 301. End cap; 4. Support leg; 401. Connecting seat; 402. Connecting block; 403. Support base; 5. Connecting rod; 501. Connecting sleeve; 6. Hinge assembly; 601. Hinge front end; 602. Hoses protective sleeve; 603. Pin; 604. Hinge block; 605. Hinge rear end. Detailed Implementation

[0037] To illustrate the technical content, structural features, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0038] This invention provides a flexible and adjustable rescue stretcher for convenient passage through narrow right-angle bends. Figure 2 For the stretcher design process, Figure 3 , Figure 4 and Figure 5 As shown, it includes a stretcher cloth 1, an adapter 2, a stretcher bar handle 3, a support retraction assembly 4, a connecting rod 5, and a hinge assembly 6.

[0039] Please see Figure 1 and Figure 2 The present invention provides a design method and application of a flexible adjustable rescue stretcher for convenient passage through narrow right-angle turns, comprising the following steps:

[0040] Step S1: Based on the width of the ship passage being L, the length A and width X of the stretcher are calculated on the premise that the stretcher bends at 45° when it bends through the ship passage.

[0041] Step S2: The diameter of the stretcher connecting pipe 501 is set to meet the weight requirements of the person in question.

[0042] Step S3: Determine the length A, width X, and diameter of the stretcher connecting rod 5 through steps S1 and S2, so that subsequent designs can meet the requirements of a flexible stretcher structure for passing through narrow passages on ships.

[0043] Furthermore, based on the width L determined by the ship passage, the stretcher length A is pre-assuming that the bent portion of the stretcher is at 45° when it bends through the ship passage. In this case, the stretcher is designed to be at its maximum length, and the stretcher length L should satisfy the following relationship:

[0044]

[0045] Where A is the stretcher length, X is the stretcher width, and L is the width of the ship passageway.

[0046] The derivation process of the above formula relationship is as follows:

[0047] make

[0048] Right now

[0049] Depend on Figure 1 As shown, given the width L of the ship passage, the length A of the stretcher can be calculated from the width X of the stretcher.

[0050] As shown above, the length of the stretcher can be determined using the above formula. Further, the outer diameter of the stretcher connecting tube should be designed based on the weight of the person, satisfying the following relationship:

[0051]

[0052] Where D is the outer diameter of connecting rod 5, A is the stretcher length, F is the weight of the person, n is the safety factor of connecting rod 5, and σ n The ultimate stress of the material in connecting rod 5 is given.

[0053] The derivation process of the above formula relationship is as follows:

[0054]

[0055] Where: d is the inner diameter of the stretcher connecting pipe. To ensure that d is within the reasonable range of national standards: let D = d + 3

[0056] After simplifying the representation of personnel weight on a stretcher, we have:

[0057] Where M is the torque when the person is placed on the stretcher, and to ensure that its σ is within a reasonable range, we have:

[0058] Where: [σ] is the allowable stress of the stretcher connecting pipe, n is the safety factor, and σ n This represents the ultimate stress of the stretcher connecting pipe material. Once the stretcher length A, width X, and the inner and outer diameters of the stretcher connecting rod 5 are determined, the design of the structure outside the stretcher can be further carried out.

[0059] The main components of the stretcher, such as Figure 3 The stretcher has a rectangular structure: the retractable support section is located at the bottom of the main body, and the retractable support section and the bottom of the connecting rod 5 are connected by a support base 403. The upper sleeve of the support base 403 passes through the connecting rod 5, and the lower end is fitted into the support leg 4. The connecting base 401 and the support leg 4 are connected by a fixing pin and can rotate relative to each other. The connecting block 402 is located in the middle part of the stretcher, and the connecting base 401 is symmetrically distributed at the ends. The end cap 301 has a cylindrical front end that is inserted into the groove of the stretcher handle 3 for fixation. The stretcher cloth 11 surrounds the inner side of the connecting rod 5 and is divided into four parts, symmetrically distributed at the front and back of the connecting rod 5, with two symmetrically distributed in the middle. The stretcher cloth 1 is located above the stretcher connecting rod 5, and two symmetrical reinforcing support cloths 101 are added in the middle of the stretcher cloth 1.

[0060] like Figure 3 As shown, there are four connecting rods 5 and three adapters 2. At the middle right end, there is a hinge assembly 6 in the connecting rod 5. The hinge assembly 6 is symmetrically distributed on both sides of the stretcher.

[0061] like Figure 4 As shown, four support legs 4 are distributed at the front end of the adapter 2, serving as support for the stretcher. Connecting seats 401 and connecting blocks 402 are symmetrically arranged to support the connecting rods 5 at both ends. Rotating the support legs 4 inward causes the connecting seats 401 to retract outward.

[0062] like Figure 5 As shown, adapter 2, adapter front claw 201, and adapter rear claw 202 perform opening and closing functions during the folding process. Before the support leg 4 folds inward, the inner section of adapter 2 is parallel to the connecting rod 5, providing support. When the support leg 4 folds inward, it drives the connecting seat 401 and connecting block 402 to extend outward. At this time, the connecting rod 5 drives adapter 2 to rotate 90°, thereby achieving folding.

[0063] Figure 6 As shown, the hinge assembly 6 includes: a hinge front end 601, a hose protective sleeve 602, a pin 603, a hinge block 604, and a hinge rear end 605. When passing through a narrow right-angle bend, the hinge blocks 604 cooperate to rotate left and right. After the pin in the hinge rear end 605 is removed, the hinge assembly 6 can slide in the connecting rod 5 to achieve left and right rotation and pass through the narrow right-angle bend.

[0064] Compared with existing technologies, this invention calculates the length, width, and connecting pipe diameter of the stretcher under the conditions of narrow ship passages and personnel weight limitations, determines the parameters of the stretcher's length, width, and connecting pipe diameter, and determines the size and structure of the stretcher based on these parameters, thus carrying out a detailed stretcher design. The specific movement mode of the designed stretcher through narrow ship passages is as follows: When the stretcher is in use, the support assembly provides support for the entire device. During rescue, the patient needs to be lifted to the middle of the stretcher fabric 1. The reinforced support fabric 101 helps to reinforce the stretcher fabric 1 for the patient. At this time, the person can move the stretcher by holding the stretcher handle 3. When encountering a narrow right-angle passage, the pin in the rear end 605 of the hinge is removed, and the hinge blocks 604 in the hinge assembly 6 cooperate in sequence to rotate left and right in the plane along the steering requirements. At this time, the hinge assembly 6 can also move back and forth within the connecting rod 5, and can control the angle of rotation to pass through the narrow right-angle passage. After the rescue is completed, the pin in the hinge rear end 605 is installed. The support leg 4 folds inward, causing the connecting rod 5, adapter 2, and hinge assembly 6 to rotate 45° symmetrically in opposite directions. At this time, the connecting rod 5 retracts laterally until the symmetrical connecting seats 401 on both sides are parallel. It can be folded longitudinally because the adapter 2 is installed in the same direction before and after the connecting rod 5, while the middle adapter 2 is opposite. After the rotation is completed, the patient is placed. The adapter front claw 201 and adapter rear claw 202 in the front and rear adapter 2 open and fold inward towards the stretcher surface. The middle adapter 2 is opposite to the front one. They are folded into three sections in sequence to reduce the storage volume. Figure 7 As shown.

Claims

1. A flexible, adjustable rescue stretcher that allows for easy passage through narrow, right-angled bends, characterized in that: Includes a stretcher frame, a stretcher cloth (1) surrounding the inside of the stretcher frame, and a support and retractable support section for connecting the frame; The stretcher frame includes two stretcher poles, each stretcher pole is connected by multiple connecting rods (5) through a connecting adapter (2), and the middle part of each stretcher pole is also provided with a hinge assembly (6). A stretcher cloth (1) is provided between the two stretcher poles. The stretcher cloth (1) is wrapped around the two stretcher poles on both sides. The front and rear ends of the stretcher cloth (1) have reinforcing support cloth (101). The two stretcher poles are connected by the bracket connecting the retractable support section, which is the support and folding structure of the stretcher frame. The two ends of the support connecting the retractable support part are respectively provided with support seats (403). The sleeve of the support seat (403) is sleeved on the connecting rod (5). The support seat (403) is fixed with a fixing pin in the central limiting hole of the stretcher outer part. The support leg (4) is installed below the support seat (403). The support seat (403) is hinged to the support leg (4) and is provided with a fixing pin. The connecting seat (401) is longitudinally hinged to the support leg (4), and the side of the support leg (4) close to the connecting seat (401) is triangular, and the positioning bolt connected to the connecting seat (401) is rotated for positioning. A pair of connecting seats (401) are hinged together by connecting blocks (402), wherein the connecting blocks (402) have limit holes on both sides to facilitate the connecting blocks (402) to rotate on the connecting seats (401), and the support legs (4) and the connecting seats (401) are installed below the support base (403); The hinge assembly (6) includes multiple hinge blocks (604) connected in sequence by pins (603); the rear end (605) of the hinge assembly (6) is connected and fixed to the adapter (2) through a connecting sleeve, wherein the adapter (2) and the connecting sleeve are connected to the inward rotating part of the support leg (4) and drive the hinge block (604) to rotate, the concave interface at the front end of the hinge block (604) is embedded with the protrusion of the connected hinge block (604), wherein the front end of the protrusion of the hinge block (604) has a certain arc and is a distance from the concave interface at the front end of the connected hinge block (604) to facilitate the rotation of the protrusion of the hinge block (604), the hinge blocks (604) can be rotated through pins (603), and the concave interface of the hinge block (604) is embedded with the protrusion of the next hinge block (604) and connected in sequence by pins (603); The connecting rod (5) is embedded in the sleeve of the hinge front end (601). The connecting rod (5) is locked in the hinge front end (601) by a limiting ring. The circular sliding structure of the hinge front end (601) can slide along the connecting rod (5). The circumferential limiting hole of the sliding structure of the hinge front end (601) and the limiting hole of the connecting rod (5) are fixed with a fixing pin. The hinge assembly (6) is covered with a flexible hose protective sleeve (602) and is fixed to the connecting rod (5) and the adapter (2) by a limiting ring and a limiting screw; The two ends of the stretcher pole are respectively connected to the stretcher pole handshake (3) by groove fixing pins.

2. The flexible and adjustable rescue stretcher for convenient passage through narrow right-angle turns as described in claim 1, characterized in that, The adapter (2) includes a front claw (201) and a rear claw (202); the front claw (201) and the rear claw (202) are multi-layer connecting claws, and the front claw (201) and the rear claw (202) are hinged by a pin; the adapter (2) is provided with limiting grooves at both ends for connecting and fixing with the connecting rod (5).

3. The flexible and adjustable rescue stretcher for convenient passage through narrow right-angle turns as described in claim 1, characterized in that, The hinge assembly (6) includes seven hinge blocks (604) connected in sequence; each stretcher is provided with four support legs (4) and four support seats (403), and each stretcher pole is provided with three adapters (2).

4. The flexible and adjustable rescue stretcher for convenient passage through narrow right-angle turns as described in claim 1, characterized in that, The front end of the stretcher handle (3) is connected to the end cap (301) and fixed with the limiting groove. The groove diameter of the end cap (301) is smaller than that of the corresponding stretcher handle (3). The stretcher handle (3) and the connecting rod (5) at the end of the stretcher have an intersection part. The diameter of the stretcher handle (3) is smaller than that of the connecting rod (5). The stretcher handle (3) extends into the connecting rod (5) and is limited by the connecting sleeve (501) with the same size limiting hole. It is also limited and fixed by the limiting screw.

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