Inflatable hoisting pad for emergency rescue

Abstract

The invention discloses an inflatable hoisting pad for emergency rescue, and relates to the field of emergency rescue equipment, the inflatable hoisting pad comprises a plurality of hoisting pad bodies, and the hoisting pad bodies are provided with inflation pipes and deflation pipes; each load assembly comprises a first anti-skid plate and a second anti-skid plate which are arranged on the upper side and the lower side of the hoisting pad body, a U-shaped frame is fixedly connected to the top wall of each second anti-skid plate, and a plurality of blocking assemblies are arranged at an opening of each U-shaped frame; the supporting assemblies are used for supporting and locking the distance between the first anti-skid plate and the second anti-skid plate after the hoisting pad body is inflated; and the plurality of connecting assemblies are used for detachably connecting two adjacent load assemblies. Through the load assembly, the supporting assembly and the connecting assembly, the problems that an existing inflatable lifting pad is poor in skid resistance, unstable in stacking connection and insufficient in supporting and locking are solved.

Description

Technical Field

[0001] This invention relates to the field of emergency rescue equipment technology, specifically to an inflatable lifting pad for emergency rescue. Background Technology

[0002] In emergency rescue operations for various disasters and accidents, especially in scenarios such as building collapses and traffic accident rescues, it is often necessary to quickly and safely lift heavy objects in confined, unstable, or restricted spaces to open rescue channels or rescue trapped individuals. Traditional lifting equipment, such as hydraulic jacks and lifting air cushions, has many limitations when used in such complex environments.

[0003] While conventional inflatable lifting mats have been used in emergency rescue due to their small size, portability, and ease of deployment, they still face the following problems in practical use: First, when the lifting mat is inflated, the friction between its bearing surface and the load and the ground is limited, making it prone to slippage when lifting tilted or uneven loads, posing a safety hazard. Second, to adapt to different lifting height requirements, multiple lifting mats sometimes need to be stacked, but the connection methods between the mats in the current technology are often not stable or convenient enough, making it difficult to quickly form a reliable assembly, affecting rescue efficiency. Third, the inflated lifting mat mainly relies on internal air pressure to maintain its height, and there is a certain risk of height shrinkage or instability under prolonged load or sudden load changes, and the rigidity and self-locking ability of the support need to be strengthened. In addition, the functional structure of existing lifting mats is relatively simple, lacking integrated design considerations on how to effectively prevent loads from accidentally slipping off the edge of the mat during lifting. Summary of the Invention

[0004] The purpose of this invention is to provide an inflatable lifting mat for emergency rescue, which solves the problems of poor anti-slip properties, unstable stacking connection, and insufficient support and locking of existing inflatable lifting mats.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An inflatable lifting mat for emergency rescue includes:

[0007] Several lifting pad bodies, wherein each lifting pad body is provided with an inflation pipe and an deflation pipe;

[0008] Several load components include a first anti-slip plate and a second anti-slip plate disposed on the upper and lower sides of the lifting pad body. The bottom wall of the first anti-slip plate has a limiting notch, and the top wall of the second anti-slip plate is fixedly connected to a U-shaped frame. Several blocking components are provided at the opening of the U-shaped frame.

[0009] Several support components are disposed between the first anti-slip plate and the second anti-slip plate to support and lock the gap between the first anti-slip plate and the second anti-slip plate after the lifting pad body is inflated;

[0010] Several connecting components are disposed on the load components for detachably connecting two adjacent load components.

[0011] Furthermore, the blocking component includes:

[0012] Positioning holes are provided on the second anti-slip plate;

[0013] A baffle, which is hinged to the opening in the inner wall of the U-shaped frame;

[0014] The chute is located on the bottom wall of the baffle.

[0015] The insertion rod is slidably connected within the groove;

[0016] A spring is positioned between the insert rod and the inner wall of the groove.

[0017] Furthermore, a connecting rod is slidably connected to the baffle, one end of which is fixedly connected to the insert rod, and the other end extends to the outside of the baffle and is fixedly connected to a handle.

[0018] Furthermore, the support component includes a follower component and a limiting component, the follower component including:

[0019] The top wall of the hinged plate is hinged to the bottom wall of the first anti-slip plate;

[0020] The first sliding frame is fixedly connected to the bottom wall of the hinge plate;

[0021] The second sliding frame is fixedly connected to the top wall of the second anti-slip plate;

[0022] The first slider is slidably connected to the first sliding frame;

[0023] The second slider is slidably connected to the second slide frame;

[0024] The X-shaped hinge frame has one end of its top hinged to the bottom wall of the hinge plate, and the other end rotatably connected to the first slider via a pivot. One end of its bottom hinges to the top wall of the second anti-slip plate, and the other end rotatably connected to the first slider via a pivot.

[0025] Furthermore, the limiting component includes:

[0026] Two cylinders are fixedly connected to the bottom wall of the hinge plate and the top wall of the second anti-slip plate, respectively;

[0027] Two stops are fixedly connected to the output ends of two cylinders, and they correspond to the first slider and the second slider, respectively.

[0028] Furthermore, the connecting component includes a locking pin component and a positioning component, the locking pin component comprising:

[0029] Several first connecting holes are provided on the first anti-slip plate;

[0030] Several second connecting holes are provided on the second anti-slip plate, and their positions correspond to those of several first connecting holes respectively;

[0031] A number of positioning rods are provided. When two adjacent load components are stacked, the upper end of the positioning rod is inserted into the second connecting hole of the second anti-slip plate in the upper load component, and the lower end of the positioning rod is inserted into the first connecting hole of the first anti-slip plate in the lower load component.

[0032] Several pin holes are formed on the side wall of the positioning rod;

[0033] Several connecting holes are provided on the side wall of the first anti-slip plate;

[0034] Several pins are disposed in the connecting holes and are used to pass through the pin holes to fix the second anti-slip plate and the first anti-slip plate of two adjacent load components.

[0035] Furthermore, the positioning component includes;

[0036] The external thread section is located on the protrusion of the pin sidewall;

[0037] The internal thread section is located inside the connecting hole and corresponds to the external thread section.

[0038] Compared with existing technologies, the inflatable lifting mat for emergency rescue provided by this invention provides strong friction directly through the texture of the first and second anti-slip plates; and restricts the lateral displacement of the mat and the load from a physical structure through the cooperation of the U-shaped frame and the limiting notch; finally, the quick-opening and closing blocking component can firmly lock the mat in the U-shaped frame to form a rigid guardrail, fundamentally preventing accidental detachment; ensuring that the lifting mat body can maintain operational stability and inherent safety even under complex working conditions such as vibration and tilt.

[0039] During the inflation and lifting process of the lifting pad, its X-shaped hinged frame extends smoothly. Through the hinged design between the top wall of the hinged plate and the bottom wall of the first anti-slip plate, the first anti-slip plate can adaptively tilt, thus firmly adhering to the uneven bottom surface of the heavy object or the ground. After reaching the required height, the limiting component is activated, and the cylinder precisely pushes the stop block to extend and lock the sliding parts, instantly transforming the entire flexible extension mechanism into a stable rigid support structure. This process eliminates the risk of retraction or instability that may occur when relying solely on gas pressure to maintain the height, ensuring a durable and reliable lifting state.

[0040] Multiple load components can be quickly stacked using the connecting components. A positioning rod is inserted into the corresponding connecting holes of adjacent load components for initial alignment. Then, a pin is inserted from the side and passes through the pin hole on the positioning rod. Finally, the pin is rotated so that its external thread engages with the internal thread in the connecting hole, thus achieving a stable mechanical connection of multiple pads. This structure allows rescue personnel to flexibly and quickly stack multiple load components, similar to assembling standard modules, according to the available space and lifting requirements. This enables the construction of a rigid support system in confined or complex terrain that adapts to different heights while ensuring overall stability, improving the adaptability and efficiency of rescue plans. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0042] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the unfolded structure of the lifting pad body, the first anti-slip plate, and the second anti-slip plate provided in an embodiment of the present invention.

[0044] Figure 3 This is a schematic diagram of the structure of the second anti-slip plate, U-shaped frame, and blocking assembly provided in an embodiment of the present invention;

[0045] Figure 4 Provided for embodiments of the present invention Figure 3 Enlarged view of section A in the middle;

[0046] Figure 5 This is a schematic diagram of the structure of the support component provided in an embodiment of the present invention;

[0047] Figure 6 Provided for embodiments of the present invention Figure 5 Enlarged view of section B;

[0048] Figure 7 This is a schematic diagram of the overall structure after cross-section provided in an embodiment of the present invention;

[0049] Figure 8 Provided for embodiments of the present invention Figure 7 Enlarged view of section C;

[0050] Figure 9 This is a schematic diagram of the unfolded structure between the positioning rod and the pin provided in an embodiment of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Lifting pad body; 2. Load assembly; 3. Support assembly; 4. Connecting assembly; 11. Inflation pipe; 12. Deflator pipe; 21. First anti-slip plate; 22. Second anti-slip plate; 23. U-shaped frame; 24. Blocking assembly; 241. Positioning hole; 242. Baffle; 243. Slide groove; 244. Insert rod; 245. Spring; 246. Connecting rod; 247. Handle; 25. Limiting notch; 31. Follow-up assembly Components; 311, hinge plate; 312, slide frame; 313, slider; 314, X-type hinge frame; 32, limit assembly; 321, cylinder; 322, stop block; 41, locking pin assembly; 411, first connecting hole; 412, second connecting hole; 413, positioning rod; 414, pin hole; 415, connecting hole; 416, pin shaft; 42, positioning assembly; 421, external thread section; 422, internal thread section. Detailed Implementation

[0053] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0054] Please see Figures 1 to 9 An inflatable lifting mat for emergency rescue, comprising:

[0055] Several lifting pad bodies 1, each lifting pad body 1 is equipped with an inflation pipe 11 and an deflation pipe 12;

[0056] Several load components 2, including a first anti-slip plate 21 and a second anti-slip plate 22 disposed on the upper and lower sides of the lifting pad body 1, the bottom wall of the first anti-slip plate 21 is provided with a limiting notch 25, the top wall of the second anti-slip plate 22 is fixedly connected with a U-shaped frame 23, and several blocking components 24 are provided at the opening of the U-shaped frame 23.

[0057] Several support components 3 are disposed between the first anti-slip plate 21 and the second anti-slip plate 22, and are used to support and lock the gap between the first anti-slip plate 21 and the second anti-slip plate 22 after the lifting pad body 1 is inflated;

[0058] Several connecting components 4 are disposed on the load components 2 for detachably connecting two adjacent load components 2.

[0059] At the emergency rescue site, the operator first places the lifting pad body 1 and load assembly 2 under the heavy object to be lifted, and quickly inflates it through the air tube 11 to lift it. The first anti-slip plate 21 and the second anti-slip plate 22 in the load assembly 2 contact the heavy object and the ground respectively. Through the anti-slip design of the surface and the combined action of the limiting notch 25, the U-shaped frame 23 and the blocking component 24, the friction is increased and the heavy object is prevented from slipping accidentally. After inflation, the support component 3 automatically provides rigid support and locks the gap between the first anti-slip plate 21 and the second anti-slip plate 22 to prevent height retraction or instability. At the same time, the connecting component 4 can be used to quickly and stably disassemble or splice adjacent load assemblies 2 to realize the stacking use of multiple pads. Through integrated design, the system improves the stability, safety and adaptability of the lifting process, and can quickly form reliable support in narrow and uneven spaces, effectively helping to open up rescue channels and rescue trapped people.

[0060] The blocking component 24 includes:

[0061] Positioning hole 241 is provided on the second anti-slip plate 22;

[0062] baffle 242, which is hinged to the opening in the inner wall of U-shaped frame 23;

[0063] The chute 243 is formed on the bottom wall of the baffle 242;

[0064] Insert rod 244 is slidably connected in slide groove 243, and insert rod 244 corresponds to positioning hole 241;

[0065] Spring 245 is disposed between the insert rod 244 and the inner wall of the slide groove 243.

[0066] During operation, the lifting pad body 1 is first placed inside the U-shaped frame. Then, the baffle 242, which is hinged to the opening of the U-shaped frame 23, is rotated inward so that the insertion rod 244 is aligned with the positioning hole 241. Under the elastic force of the spring 245, the insertion rod 244 slides along the slide groove 243 at the bottom of the baffle 242 and automatically inserts into the positioning hole 241 on the second anti-slip plate 22, thereby firmly locking the baffle 242 and forming a side guardrail. This component can be quickly deployed and can prevent the lifting pad body 1 from accidentally slipping off during daily carrying.

[0067] A connecting rod 246 is slidably connected to the baffle 242. One end of the connecting rod 246 is fixedly connected to the insert rod 244, and the other end extends to the outside of the baffle 242 and is fixedly connected to the handle 247.

[0068] During operation, when it is necessary to release the lock of the baffle 242, the operator can directly pull the handle 247 upwards. The handle 247, through the connecting rod 246, drives the insertion rod 244 to overcome the elastic force of the spring 245 and slide out of the positioning hole 241, thereby releasing the lock and lowering the baffle 242. After releasing the handle 247, the insertion rod 244 returns to its original position under the action of the spring 245, ready for the next locking. This handle 247 structure provides an active and convenient manual unlocking method, enhancing the operational efficiency and reliability of the blocking assembly 24 during emergency adjustments or retraction.

[0069] Support component 3 includes follower component 31 and limit component 32. Follower component 31 includes:

[0070] The top wall of the hinge plate 311 is hinged to the bottom wall of the first anti-slip plate 21;

[0071] Two sliding frames 312 are respectively fixedly connected to the bottom wall of the hinge plate 311 and the top wall of the second anti-slip plate 22;

[0072] Two sliders 313 are slidably connected to two sliding frames 312 respectively;

[0073] The X-shaped hinge frame 314 has one end of its top hinged to the bottom wall of the hinge plate 311, and the other end rotatably connected to a slider 313 via a pivot. One end of its bottom hinges to the top wall of the second anti-slip plate 22, and the other end rotatably connected to another slider 313 via a pivot.

[0074] During operation, as the lifting pad inflates and rises, the distance between the first anti-slip plate 21 and the second anti-slip plate 22 increases, causing the X-shaped hinge frame 314 to unfold. At the same time, the two sliders 313 slide towards each other within their respective sliding frames 312, allowing the entire follower assembly 31 to extend smoothly to adapt to and synchronously support the current height. During this process, the top wall of the hinge plate 311 is hinged to the bottom wall of the first anti-slip plate 21. This design allows the entire support assembly 3 to adaptively tilt within a certain angle when there is a heavy object or uneven ground, thereby achieving stable tilt support and effectively preventing lateral slippage or instability caused by uneven force. After being lifted to the required height, the limiting assembly 32 is activated to lock the sliders 313, turning the entire assembly into a rigid support structure, thereby reliably maintaining the lifting height and preventing retraction.

[0075] Limiting component 32 includes:

[0076] Two cylinders 321 are respectively fixedly connected to the bottom wall of the hinge plate 311 and the top wall of the second anti-slip plate 22;

[0077] Two stop blocks 322 are fixedly connected to the output ends of two cylinders 321, and each corresponds to one of the two sliders 313.

[0078] Once the lifting pad is inflated and raised to the required height and the follower component 31 has extended, the operator controls the two cylinders 321 to start simultaneously, pushing the stop block 322 at its output end to extend and respectively block and lock the position of the two sliders 313 within the slide frame 312, preventing them from sliding. The limiting component 32 quickly and actively locks the X-shaped hinge frame 314 into its extended state, transforming the originally sliding follower mechanism into a rigid support structure. This prevents the lifting pad from shrinking back or becoming unstable due to internal air pressure fluctuations or load changes when under load, thus enhancing the overall reliability and safety of the lifting process.

[0079] The connecting component 4 includes a locking pin component 41 and a positioning component 42. The locking pin component 41 includes:

[0080] A number of first connecting holes 411 are provided on the first anti-slip plate 21;

[0081] A plurality of second connecting holes 412 are provided on the second anti-slip plate 22, and each of them corresponds to a plurality of first connecting holes 411 in position;

[0082] A number of positioning rods 413 are provided. When two adjacent load components 2 are stacked, the upper end of the positioning rod 413 is inserted into the second connecting hole 412 of the second anti-slip plate 22 in the upper load component 2, and the lower end of the positioning rod 413 is inserted into the first connecting hole 411 of the first anti-slip plate 21 in the lower load component 2.

[0083] Several pin holes 414 are formed on the side wall of the positioning rod 413;

[0084] Several connecting holes 415 are provided on the side wall of the first anti-slip plate 21;

[0085] Several pins 416 are disposed in the connecting holes 415 and are used to pass through the pin holes 414 to fix the second anti-slip plate 22 and the first anti-slip plate 21 of two adjacent load components 2.

[0086] During operation, when it is necessary to stack the upper and lower load components 2, first insert the upper end of the positioning rod 413 into the second connecting hole 412 of the second anti-slip plate 22 of the upper load component 2, and at the same time insert the lower end into the first connecting hole 411 of the first anti-slip plate 21 of the lower load component 2 to achieve initial positioning and alignment; then, insert the pin 416 horizontally from the connecting hole 415 on the side wall of the first anti-slip plate 21, so that it passes through the pin hole 414 on the side wall of the positioning rod 413, thereby firmly locking the anti-slip plates of the upper and lower components together; this connecting component 4 can realize the rapid and stable mechanical splicing of adjacent load components 2, forming a rigid stacked structure, which can prevent displacement or separation between the pads during the lifting process.

[0087] Positioning component 42 includes;

[0088] External thread section 421 is located on the protrusion of the side wall of pin 416;

[0089] The internal thread section 422 is located inside the connecting hole 415 and corresponds to the external thread section 421.

[0090] During operation, after horizontally inserting the pin 416 into the connecting hole 415 and passing through the pin hole 414 of the positioning rod 413, the pin 416 is rotated to engage the external thread section 421 on its side wall protrusion with the internal thread section 422 in the connecting hole 415 until the pin 416 is completely tightened and fixed. The threaded locking structure of this component provides mechanical self-locking for the pin 416 connection, which can prevent the pin 416 from accidentally loosening or coming out under vibration or load changes during the lifting process.

[0091] Working principle: The operator first places the assembled lifting pad body 1 and load assembly 2 under the load to be lifted, and quickly inflates the pad body through the inflation pipe 11 to generate lifting force. At this time, the first anti-slip plate 21 and the second anti-slip plate 22 in the load assembly 2 contact the bottom of the load and the ground respectively. The anti-slip design of their surfaces, combined with the limiting notch 25 on the first anti-slip plate 21 and the U-shaped frame 23 on the second anti-slip plate 22 locked by the blocking assembly 24, work together to prevent the lifting pad body 1 from slipping off accidentally. At the same time, the support assembly 3 moves as the inflation height increases: the X-shaped hinge frame 314 in the follow-up assembly 31 extends accordingly, and the sliders 313 at both ends slide in the sliding frame 312 fixed to the hinge plate 311 and the second anti-slip plate 22 respectively. The hinge design of the hinge plate 311 allows the assembly to tilt adaptively to maintain stability. After lifting to the required height, the two cylinders 321 of the limiting assembly 32 are activated synchronously. The system pushes the stop block 322 to extend and abut against the slider 313, thereby locking the entire extension mechanism into a rigid support, reliably maintaining the lifting height and preventing retraction or instability due to load or air pressure changes. In addition, when a greater lifting height is required, multiple units can be quickly stacked using the connecting component 4: the positioning rod 413 is inserted into the corresponding connecting hole 415 of the upper and lower adjacent load components 2 for initial alignment, then the pin 416 is inserted from the side and passes through the pin hole 414 on the positioning rod 413, and finally the pin 416 is rotated so that its external thread section 421 engages with the internal thread section 422 in the connecting hole 415 to lock it, thereby achieving a stable mechanical splicing of multiple pads. Through the functions of inflatable lifting, anti-slip limiting, rigid support and modular connection, the system improves the stability, safety and operational adaptability of rescue lifting operations in narrow and uneven spaces, can quickly form reliable support, and efficiently help open rescue channels and rescue trapped personnel.

[0092] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An inflatable lifting mat for emergency rescue, characterized in that, include: Several lifting pad bodies (1), each lifting pad body (1) is provided with an inflation pipe (11) and an deflation pipe (12). Several load components (2) include a first anti-slip plate (21) and a second anti-slip plate (22) disposed on the upper and lower sides of the lifting pad body (1). The bottom wall of the first anti-slip plate (21) has a limiting notch (25), and the top wall of the second anti-slip plate (22) is fixedly connected to a U-shaped frame (23). Several blocking components (24) are provided at the opening of the U-shaped frame (23). Several support components (3) are disposed between the first anti-slip plate (21) and the second anti-slip plate (22) to support and lock the gap between the first anti-slip plate (21) and the second anti-slip plate (22) after the lifting pad body (1) is inflated; Several connecting components (4) are disposed on the load components (2) for detachably connecting two adjacent load components (2).

2. The inflatable lifting mat for emergency rescue according to claim 1, characterized in that, The blocking component (24) includes: Positioning hole (241) is provided on the second anti-slip plate (22); A baffle (242) is hinged to the opening in the inner wall of the U-shaped frame (23); A chute (243) is formed on the bottom wall of the baffle (242); Insert rod (244), which is slidably connected in groove (243); A spring (245) is disposed between the insert (244) and the inner wall of the groove (243).

3. The inflatable lifting mat for emergency rescue according to claim 2, characterized in that, A connecting rod (246) is slidably connected to the baffle (242). One end of the connecting rod (246) is fixedly connected to the insert rod (244), and the other end extends to the outside of the baffle (242) and is fixedly connected to a handle (247).

4. The inflatable lifting mat for emergency rescue according to claim 1, characterized in that, The support component (3) includes a follower component (31) and a limiting component (32), wherein the follower component (31) includes: The top wall of the hinge plate (311) is hinged to the bottom wall of the first anti-slip plate (21); Two sliding frames (312) are respectively fixedly connected to the bottom wall of the hinge plate (311) and the top wall of the second anti-slip plate (22); Two sliders (313) are slidably connected to two sliding frames (312); The X-shaped hinge frame (314) has one end of its top hinged to the bottom wall of the hinge plate (311), and the other end rotatably connected to a slider (313) via a pivot. One end of its bottom is hinged to the top wall of the second anti-slip plate (22), and the other end rotatably connected to another slider (313) via a pivot.

5. An inflatable lifting mat for emergency rescue according to claim 4, characterized in that, The limiting component (32) includes: Two cylinders (321) are fixedly connected to the bottom wall of the hinge plate (311) and the top wall of the second anti-slip plate (22), respectively; Two stops (322) are fixedly connected to the output ends of two cylinders (321) respectively, and they correspond to two sliders (313) respectively.

6. An inflatable lifting mat for emergency rescue according to claim 1, characterized in that, The connecting component (4) includes a locking pin component (41) and a positioning component (42), wherein the locking pin component (41) includes: Several first connecting holes (411) are provided on the first anti-slip plate (21); A number of second connecting holes (412) are provided on the second anti-slip plate (22), and their positions correspond to those of a number of first connecting holes (411); A number of positioning rods (413) are provided. When two adjacent load components (2) are stacked, the upper end of the positioning rod (413) is inserted into the second connecting hole (412) of the second anti-slip plate (22) in the upper load component (2), and the lower end of the positioning rod (413) is inserted into the first connecting hole (411) of the first anti-slip plate (21) in the lower load component (2). Several pin holes (414) are formed on the side wall of the positioning rod (413); Several connecting holes (415) are provided on the side wall of the first anti-slip plate (21); Several pins (416) are disposed in the connecting hole (415) and are used to pass through the pin hole (414) to fix the second anti-slip plate (22) and the first anti-slip plate (21) of two adjacent load components (2).

7. An inflatable lifting mat for emergency rescue according to claim 7, characterized in that, The positioning component (42) includes; The external thread section (421) is located on the protrusion of the side wall of the pin (416); The internal thread section (422) is located in the connecting hole (415) and corresponds to the external thread section (421).

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