Pull rod locking structure on folding shopping cart

Abstract

The utility model relates to a pull rod locking structure on a folding shopping cart. The pull rod locking structure comprises a shopping cart box body and a pull rod assembly arranged on a shopping cart body. A rear box plate of the shopping cart box body is provided with a pull rod groove. The pull rod assembly is hinged to the lower portion of the pull rod groove. A locking assembly is arranged on the pull rod assembly, and a locking seat is arranged in the pull rod groove; when the pull rod assembly rotates along the hinge point to be embedded into the pull rod groove, the output end of the locking assembly is clamped into the locking seat, and the pull rod assembly is limited in the pull rod groove. The locking device is characterized in that the locking assembly comprises a buckle plate arranged on the pull rod assembly in a longitudinal moving mode, a spring bolt fixed to the buckle plate and an elastic component used for driving the buckle plate and the spring bolt to stretch out and reset; when the buckle plate longitudinally moves relative to the pull rod assembly, the lock tongue can be driven to advance and retreat relative to the locking base, and clamping locking or separation unlocking of the lock tongue and the locking base is achieved. The scheme has the advantages of simplified structure, convenience in operation and high locking stability.

Description

Technical Field

[0001] This utility model relates to the field of folding shopping cart technology, and in particular to a lever locking structure for a folding shopping cart. Background Technology

[0002] Pull-along storage cases are widely used in daily shopping and travel due to their portability. Traditional pull-along storage cases usually use a fixed-angle pull rod design. When the case is loaded with heavy items, it needs to be tilted to adjust the pulling angle of the rod. However, tilting the case causes uneven force on the bottom wheels, which can easily lead to wheel wear or even damage over time. At the same time, the pull rod is prone to deformation and breakage due to the large bending moment it bears, increasing the burden on the user.

[0003] To address the aforementioned issues, existing technologies have proposed several improvement solutions. For example, patent CN216796778U discloses a foldable storage box with a pull rod. This design involves creating a pull rod groove in the rear panel and hinged the pull rod assembly within the groove, using a limiting component to achieve both storage and locking of the pull rod. This solution utilizes the locking part in the limiting component to engage with the locking groove, enabling the pull rod to be pulled at an angle, reducing box tilt, and thus balancing the force on the rollers.

[0004] However, the design still has the following shortcomings: The locking structure is complex and inconvenient to operate: The limiting component relies on the elastic element to push the linkage between the locking part and the unlocking part. The user needs to press the unlocking parts on both sides at the same time to release the lever. The operation steps are cumbersome, and a large elastic force needs to be overcome when unlocking, which requires a high level of hand force; The long-term stability is insufficient: The mating surface between the locking part and the locking groove is a planar contact, which is prone to wear under frequent unlocking and vibration environments, leading to locking failure.

[0005] Furthermore, existing locking structures lack effective lateral limiting designs, making them prone to loosening due to vibration during transportation, thus affecting safety. Additionally, the layout of the reset mechanism in traditional locking components is unreasonable, resulting in low structural space utilization and making integration with other functional components difficult.

[0006] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0007] To address the aforementioned problems, the purpose of this invention is to provide a lever locking structure for folding shopping carts, which has the advantages of simplified structure, convenient operation, and high locking stability.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] This application provides a lever locking structure for a folding shopping cart, the technical solution of which is as follows: A lever locking structure for a folding shopping cart includes a shopping cart body and a lever assembly disposed on the shopping cart body; the rear panel of the shopping cart body is provided with a lever groove, and the lever assembly is hinged to the lower part of the lever groove; a locking component is disposed on the lever assembly, and a locking seat is disposed in the lever groove; when the lever assembly rotates along the hinge point to be embedded in the lever groove, the output end of the locking component is engaged in the locking seat, restricting the lever assembly within the lever groove; the locking component is characterized in that: the locking component includes a buckle plate that is longitudinally movable on the lever assembly, a latch fixed on the buckle plate, and an elastic component for driving the buckle plate and the latch to extend and reset; when the buckle plate moves longitudinally relative to the lever assembly, it can drive the latch to move forward and backward relative to the locking seat, thereby realizing the engagement and locking or disengagement and unlocking of the latch and the locking seat.

[0010] Furthermore, this application also proposes that the pull rod assembly includes a pull rod seat and a telescopic pull rod disposed on the pull rod seat; a locking assembly is disposed on the pull rod seat, a mounting cavity is provided on the outer end face of the pull rod seat, and a through hole is provided on the crossbeam above the mounting cavity; a snap plate is movable and disposed in the mounting cavity, and a lock tongue is longitudinally movable and disposed in the through hole of the crossbeam; the end of the lock tongue can extend out of the crossbeam or retract into the through hole.

[0011] Furthermore, this application also proposes that a spring seat is provided at the bottom of the mounting cavity, a corresponding spring groove is provided at the lower part of the buckle plate, and the elastic component is embedded in the spring seat with its upper end embedded in the spring groove.

[0012] Furthermore, this application also proposes that the outer end face of the buckle plate is provided with a buckle groove for inserting fingers for operation.

[0013] Furthermore, this application also proposes that the lower wall of the lever seat is provided with an operating groove, which is located directly below the mounting cavity; when a finger is inserted into both the buckle groove and the operating groove at the same time, it can cooperate to drive the buckle plate downward to unlock.

[0014] Furthermore, this application also proposes that at least one of the mating surfaces of the locking seat and the locking tongue is constructed as an inclined surface or an arc surface; when the locking tongue presses against the locking seat, the inclined surface is used to retract the locking tongue into the through hole, thereby achieving the locking of the locking tongue and the locking seat.

[0015] As can be seen from the above, the pull rod locking structure and its components provided in this application achieve rapid locking and unlocking of the pull rod assembly through the longitudinally moving buckle and the locking tongue in cooperation with the elastic component. At the same time, the use of inclined or curved surfaces reduces wear, and has the advantages of simplified structure, convenient operation and high locking stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixed state of the handle of a folding shopping cart provided in this application.

[0017] Figure 2 This application provides a schematic diagram of the movable state of the lever of a folding shopping cart.

[0018] Figure 3 This is a schematic diagram of the outer end face structure of the tie rod assembly.

[0019] Figure 4 This is a schematic diagram of the inner end face structure of the tie rod assembly.

[0020] Figure 5 This is an exploded view of the tie rod seat structure.

[0021] Figure 6 This is a schematic diagram of the tie rod seat.

[0022] Figure 7 This is a three-dimensional schematic diagram of the latch and bolt. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In existing technologies, pull-rod storage boxes generally use a fixed-angle pull rod design, which can easily lead to roller wear and pull rod deformation due to tilting of the box. Existing improved solutions achieve pull rod storage by setting pull rod grooves and limiting components, but these solutions have problems such as cumbersome locking mechanism operation, easy wear of the locking surface, and low space utilization of the reset mechanism. For example, when the user needs to press the unlocking part with both hands, the direction of force is inconsistent with the direction of resistance of the elastic element, resulting in difficult operation; during transportation, the locking tongue is prone to lateral slippage when in contact with the locking groove plane, causing locking failure.

[0029] To address the aforementioned issues, designers discovered an angle between the operating force direction and the resistance direction of the elastic element in traditional locking structures, leading to unlocking difficulties. Analysis of locking failure cases revealed that the planar contact locking surface is prone to micro-displacement under vibration. To address the spatial layout problem of the reset mechanism, the design considered aligning the movement axis of the elastic element with the movement direction of the locking tongue. This led to the following technical approach: establishing a longitudinal linear motion unlocking mechanism, employing an inclined contact locking surface, and optimizing the layout direction of the elastic element.

[0030] like Figure 1-7 As shown, this embodiment proposes a pull rod locking structure including a shopping cart body 1 and a pull rod assembly 2. The rear panel 10 of the shopping cart body 1 is provided with a pull rod groove 11, and the pull rod assembly 2 is hinged to the lower part of the groove. The locking assembly 3 includes a longitudinally movable buckle plate 31, a locking tongue 32 fixed to the buckle plate 31, and an elastic reset component. When the pull rod assembly 2 rotates and inserts into the pull rod groove 11, the locking tongue 32 engages with the locking seat 12 to achieve locking.

[0031] The longitudinally moving latch plate 31 refers to the operating component that slides along the length of the pull rod assembly 2. Specifically, it can be implemented using a guide rail and slide groove structure, with its movement direction perpendicular to the pull rod's folding axis. The latch 32 is fixedly connected to the latch plate 31, forming a rigid transmission body. This can be achieved using bolt fastening or an integrated molding process to ensure effective transmission of operating force. The elastic reset component is an energy storage element that provides power for the extension of the latch 32. Specifically, it can be implemented using a coil spring or an elastic rubber body, with its compression direction parallel to the movement direction of the latch plate 31.

[0032] Specifically, when the user presses down the buckle plate 31, the latch 32 retracts along the buckle plate 31 through the through hole 213, disengaging from the locking seat 12 and releasing the constraint on the pull rod assembly 2. After releasing the buckle plate 31, the elastic component 34 pushes the buckle plate 31 back to its original position, and the latch 32 extends again to prepare for locking. The contact surface between the locking seat 12 and the latch 32 is set as an inclined surface. During the folding of the pull rod, the latch 32 is guided by the inclined surface to automatically retract until it reaches the locking position and then pops out to engage. The elastic component 34 is arranged along the axial direction of the latch 32, and its elastic force acts directly on the moving direction of the buckle plate 31, avoiding force loss.

[0033] Compared with existing technologies, this solution eliminates the dual-sided unlocking buttons in the traditional structure, replacing them with a single-sided, longitudinally operated latch plate 31 structure, whose operating direction aligns with the human finger's natural force application habits. The beveled contact design between the latch 32 and the locking seat 12 replaces the planar contact, generating a self-locking effect during vibration to prevent accidental unlocking. Through the above technical solution, this application achieves a one-handed unlocking function; the user only needs to press down on the latch plate 31 with a single finger to complete the unlocking action. The beveled contact locking structure maintains stable engagement under vibration conditions and has been tested to withstand 100,000 opening and closing cycles without wear. The longitudinally arranged elastic component 34 keeps the overall thickness of the locking assembly 3 within 15mm, facilitating integration into the internal space of the lever seat 21.

[0034] Furthermore, the pull rod assembly 2 includes a pull rod seat 21 and a telescopic pull rod 22 disposed on the pull rod seat 21; the locking assembly 3 is disposed on the pull rod seat 21, and a mounting cavity 211 is provided on the outer end face of the pull rod seat 21, and a through hole 213 is provided on the crossbeam 212 above the mounting cavity 211; the buckle plate 31 is movably disposed within the mounting cavity 211, and the locking tongue 32 is longitudinally movably disposed within the through hole 213 of the crossbeam 212; the end of the locking tongue 32 can extend out of the crossbeam 212 or retract into the through hole 213. The pull rod seat 21 refers to the base structure used to support the telescopic pull rod 22 and the locking assembly 3, which can be specifically realized by injection molding, with its outer end face forming a planar mounting area to accommodate the mounting cavity 211. The mounting cavity 211 refers to the groove structure disposed on the outer end face of the pull rod seat 21, which can be specifically realized by in-mold molding, and is used to provide guide space for the longitudinal movement of the buckle plate 31. The crossbeam 212 refers to the transverse support structure at the top of the mounting cavity 211, which can be integrally formed with the mounting cavity 211 and is used to separate the mounting cavity 211 from the through hole 213 area. The through hole 213 refers to the channel structure that passes through the crossbeam 212, which can be formed by drilling or stamping processes, and is used to constrain the movement trajectory of the latch 32. The pull rod seat 21 serves as the mounting carrier of the locking assembly 3. The mounting cavity 211 on its outer end face provides a longitudinal movement track for the buckle plate 31, while the through hole 213 on the crossbeam 212 establishes a vertical guide path for the forward and backward movement of the latch 32. When the buckle plate 31 moves longitudinally in the mounting cavity 211, it drives the latch 32 to move synchronously in the through hole 213. The latch 32 is circumferentially constrained by the hole wall in the through hole 213, ensuring that its movement direction is always aligned with the locking seat 12. When the end of the locking tongue 32 extends out of the crossbeam 212, it engages with the locking seat 12 to lock; when the locking tongue 32 retracts into the through hole 213, the locking state is released. The combined structure of the telescopic rod 22 and the rod seat 21 integrates the rod length adjustment function and the locking mechanism into the same component, optimizing the spatial layout.

[0035] like Figure 5 and 6As shown, a spring seat 215 is provided at the bottom of the mounting cavity 211, and a corresponding spring groove 312 is provided at the lower part of the buckle plate 31. The elastic component 34 is embedded in the spring seat 215, with its upper end embedded in the spring groove 312. The spring seat 215 refers to the positioning structure located at the bottom of the mounting cavity 211, which can be implemented using a groove structure with an annular flange, used to fix the lower end position of the elastic component 34. The spring groove 312 refers to the recessed structure at the lower part of the buckle plate 31, which can be implemented using a cylindrical groove matching the shape of the spring seat 215, used to accommodate the upper end of the elastic component 34. The elastic component 34 is the element that provides the restoring force, which can be implemented using a helical spring or an elastic rubber column, with its two ends embedded in the spring seat 215 and the spring groove 312 respectively, forming a bidirectional constraint. After the spring seat 215 is provided at the bottom of the mounting cavity 211, the lower end of the elastic component 34 is restricted to a fixed position, preventing lateral displacement during compression. The spring groove 312 at the lower part of the snap plate 31 and the spring seat 215 form a corresponding upper and lower fitting relationship. The upper end of the elastic member 34 is embedded in the spring groove 312, forming an axial limit. When the snap plate 31 is pressed, the elastic member 34 is compressed in a preset direction between the spring seat 215 and the spring groove 312. After releasing the pressure, the elastic member 34 pushes the snap plate 31 back to its original position. This structure, through the cooperation between the spring seat 215 and the spring groove 312, restricts the movement trajectory of the elastic member 34 to the vertical direction, preventing the elastic member 34 from dislodging from the installation position due to vibration.

[0036] This application further proposes a groove 311 for finger insertion on the outer end face of the buckle plate 31. The groove 311 is a recessed structure on the outer surface of the buckle plate 31, its depth configured to accommodate the first knuckle of a user's finger, forming a fulcrum for force application. This feature provides a clearly defined contact area, enabling the user to obtain effective leverage during pressing. The outer end face refers to the surface of the buckle plate 31 facing the user's operating direction, and can be implemented as a flat or slightly curved surface to ensure the operating part is located on the outermost side of the component, facilitating direct user access. This feature optimizes spatial positioning, aligning the unlocking action's execution path with the natural direction of human force application. Specifically, when unlocking the lever, the user inserts their finger into the groove 311, where the second knuckle of the finger forms a contact fulcrum with the side wall of the groove 311. Through a downward pressing action, the contact surface between the first knuckle of the finger and the bottom of the groove 311 generates a leverage effect, converting the downward pressing force into longitudinal displacement of the buckle plate 31.

[0037] Furthermore, the lower wall of the lever base 21 is provided with an operating groove 214, which is located directly below the mounting cavity 211. When a finger is simultaneously inserted into both the buckle groove 311 and the operating groove 214, it can cooperate to drive the buckle plate 31 downward to unlock. The operating groove 214 refers to a recessed structure provided on the lower wall of the lever base 21, the position of which coincides with the vertical projection of the mounting cavity 211. Specifically, it can be implemented as a rectangular or arc-shaped groove, used to provide a fulcrum for finger force application. The cooperation between the buckle groove 311 and the operating groove 214 refers to their correspondence in the longitudinal space, which can be achieved by adjusting their depth and spacing to form an operating interface for finger clamping force application. Specifically, the operating groove 214 is located directly below the mounting cavity 211, allowing a single finger of the user to simultaneously insert into the clamping space formed by the buckle groove 311 and the operating groove 214. When the finger acts on the buckle groove 311, its fingertip can abut against the edge of the operating groove 214, forming a lever fulcrum. At this point, pressing down on the buckle groove 311 decomposes the reaction force at the edge of the operating groove 214 into a vertically downward component, thereby reducing the operational effort required to drive the buckle plate 31 downward. Due to the vertical correspondence between the operating groove 214 and the mounting cavity 211, the downward trajectory of the buckle plate 31 is restricted to the longitudinal axis direction, avoiding motion interference caused by force deviation. Compared with the prior art, traditional unlocking structures require both hands to press the unlocking parts on both sides, while this solution, through the coordinated design of the operating groove 214 and the buckle groove 311, allows the unlocking action to be completed with a single finger. In the prior art, the direction of the unlocking force completely coincides with the direction of the elastic component's resistance, while this solution, through the fulcrum effect of the edge of the operating groove 214, converts the applied force into a lever effect, effectively reducing the operational intensity. Through the above technical solution, this application achieves convenient unlocking with one hand, solving the cumbersome problem of traditional structures requiring two-handed operation; the lever fulcrum formed by the operating groove 214 and the buckle groove 311 reduces the user's applied force; and the longitudinal trajectory constraint avoids jamming caused by force deviation during the unlocking process.

[0038] like Figure 2 and 5 As shown, at least one of the mating surfaces of the locking seat 12 and the locking tongue 32 is constructed as an inclined surface or an arc surface. When the locking tongue 32 presses against the locking seat 12, the locking tongue 32 is retracted into the through hole 213 through the inclined surface engagement, thereby realizing the locking of the locking tongue 32 and the locking seat 12.

[0039] The inclined or curved surface refers to a guide structure with non-planar geometric features in the contact area. Specifically, it can be a plane with an inclination angle of 15° to 60° or a curved surface with a radius of curvature of 5 mm to 20 mm. Its function is to guide the locking tongue 32 to move along the axis of the through hole 213 through geometric force. The locking tongue 32 retracting into the through hole 213 means that the end of the locking tongue 32 moves axially along the inner wall of the through hole 213 under the action of contact pressure. Specifically, it can be achieved by using a clearance fit between the inner wall of the through hole 213 and the side wall of the locking tongue 32. Its function is to eliminate rigid collisions between the contact surfaces and achieve adaptive locking.

[0040] Specifically, when the end of the latch 32 contacts the locking seat 12, the inclined or curved surface structure decomposes the vertical contact pressure into axial and lateral components. The axial component drives the latch 32 to displace along the axis of the through hole 213, allowing the end of the latch 32 to contact the locking seat 12 even before it is fully extended. As the latch 32 continues to be pressed, the lateral component causes the latch 32 to slide along the inclined or curved surface until the latch 32 is fully engaged in the corresponding locking position of the locking seat 12.

[0041] This design, through the use of inclined or curved surfaces, transforms the contact method between the latch 32 and the locking seat 12 from planar friction to guided sliding, significantly reducing the wear rate of the contact surface. Simultaneously, the lateral force generated by the inclined or curved surfaces causes the latch 32 to automatically retract upon contact, completing the unlocking action without additional force and improving operational convenience. Through the aforementioned technical solution, the guiding effect formed by the inclined or curved surfaces allows the latch 32 to automatically adjust its position during contact, enhancing the self-adaptability of the locking process. This design effectively improves the durability and operational smoothness of the locking mechanism while maintaining structural simplicity.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A pull rod locking structure on a folding shopping cart, comprising a shopping cart body (1) and a pull rod assembly (2) arranged on the shopping cart body; a rear box plate (10) of the shopping cart body (1) is provided with a pull rod slot (11), and the pull rod assembly (2) is hinged to a lower part of the pull rod slot (11); a locking assembly (3) is arranged on the pull rod assembly (2), and a locking seat (12) is arranged in the pull rod slot (11); when the pull rod assembly (2) is rotated along the hinge point to be embedded in the pull rod slot (11), an output end of the locking assembly (3) is clamped into the locking seat (12), so as to limit the pull rod assembly (2) in the pull rod slot (11). characterized in that The locking assembly (3) comprises a buckle plate (31) arranged longitudinally on the pull rod assembly (2), a lock tongue (32) fixed on the buckle plate (31), and an elastic component (34) for driving the buckle plate (31) and the lock tongue (32) to extend and reset; when the buckle plate moves longitudinally relative to the pull rod assembly (2), the lock tongue (32) is driven to move in and out relative to the locking seat (12), so as to realize the clamping locking or separation unlocking of the lock tongue (32) and the locking seat (12).

2. The drawbar locking structure according to claim 1, characterized in that: The pull rod assembly (2) comprises a pull rod seat (21) and a telescopic pull rod (22) arranged on the pull rod seat (21); the locking assembly (3) is arranged on the pull rod seat (21), an installation cavity (211) is arranged on an outer end face of the pull rod seat (21), a through hole (213) is arranged on a cross beam (212) above the installation cavity (211), the buckle plate (31) is movably arranged in the installation cavity (211), and the lock tongue (32) is movably arranged in the through hole (213) of the cross beam (212); an end of the lock tongue (32) can extend out of the cross beam (212) or retreat into the through hole (213).

3. The drawbar locking structure according to claim 2, characterized in that: A spring seat (215) is arranged at a bottom of the installation cavity (211), a lower part of the buckle plate (31) is provided with a spring groove (312) corresponding to the lower part, and the elastic component (34) is embedded in the spring seat (215) and the upper end thereof is embedded in the spring groove (312).

4. The drawbar locking structure according to claim 3, characterized in that: A buckle groove (311) is arranged on an outer end face of the buckle plate (31) for a finger to extend into and operate.

5. The draw lock structure of claim 4, wherein: A operation groove (214) is arranged on a lower wall of the pull rod seat (21), and the operation groove (214) is located directly below the installation cavity (211); when the finger extends into the buckle groove (311) and the operation groove (214) at the same time, the buckle plate (31) can be driven to move downward and be unlocked.

6. The drag link locking structure according to claim 1, characterized by: At least one of the matching surfaces of the locking seat (12) and the lock tongue (32) is constructed as an inclined surface or an arc surface; when the lock tongue (32) is pressed towards the locking seat (12), the lock tongue (32) is retreated into the through hole (213) through the inclined surface matching, so as to realize the clamping locking of the lock tongue (32) and the locking seat (12).

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