Snap fastening unit

Abstract

The present invention relates to a snap fastening unit, which includes a housing, at least one snap block and an automatic locking device. The housing has a fastening support wall and a head extending away from the fastening support wall. The snap block is restricted to slide directionally on the guiding channel of the head. The snap block has a chuck. The snap block has a fastening position and a releasing position on the head. The snap block is configured with an elastic element, and the elastic element provides an elastic loading force that drives the snap block to slide to the fastening position and remain in the fastening position. The automatic locking device includes a first locking member provided on the snap block and moving with the snap block and a second locking member provided on the head. When the snap block slides to the releasing position, the first locking member and the second locking member automatically interlock to lock the snap block on the head, and at the same time, the elastic element completes energy storage. The automatic locking device also has a trigger member that drives the first locking member and the second locking member to unlock to release the snap block from the releasing position. It has the function of retracting and holding the snap block, and the disassembly and assembly operations are convenient.

Description

Technical Field

[0001] The present invention relates to the field of mechanical installation, specifically a snap-fastening unit for equipment installation and fixation. Background Art

[0002] Snap-fastening is a cost-effective mechanical fastening solution that does not require screws and only needs a simple mounting hole to be provided on a thin wall, which can be attached to, for example, a housing wall, a door leaf, a shutter, a frame, a door frame, or a plate-like component, etc., and is thus widely applied to various occasions; for example, to connect two or more elements with the above-mentioned thin walls together, or to connect a latch, a handle, or other devices to a frame with a thin wall (such as the application on a lock disclosed in the patent document CN217581643U).

[0003] Various structural forms of snap-fastening units are described in the related art. For example, a simple structural form of a plastic part is disclosed in the patent document US 6042296; or an institution composed of multiple parts is disclosed in the patent documents US 7600794B2, US 8001656B2, and US 8297665B2. The snap-fastening unit can be an independent element or a part integrated on a related device. The snap-fastening unit in the form of a multi-part mechanism usually includes a housing, on which there is a fastening support wall for limiting and supporting a thin wall with a through hole. The housing has a seat shell (or called a head) protruding away from the fastening support wall. Inside the seat shell, there is a snap block that can slide horizontally. The snap block has a chuck, and the chuck cooperates with the fastening support wall to clamp on the thin wall. Since the snap block is movable, the snap block has a fastening position where it cooperates with the fastening support wall to clamp and fix to the thin wall and a release position where it withdraws from the fastening position to loosen the thin wall along its sliding direction, realizing the disassembly and separation of the snap-fastening unit from the thin wall. The snap block relies on a spring to maintain its position in the fastening position. The chuck of the snap block has an inclined surface, and the inclined surface is on the side of the snap block corresponding to the assembly direction of the thin wall supported on the fastening support wall (the direction in which the seat shell protrudes on the fastening support wall). During the installation process, the snap block interacts with the periphery of the through hole on the thin wall. The periphery of the through hole pushes against the inclined surface on the snap block, thereby forcing the snap block to slide until the periphery of the through hole on the thin wall reaches the vertex of the snap block, that is, the snap block retracts to the release position. Then, the periphery of the through hole on the thin wall crosses the vertex of the snap block, and the snap block is released and reset to the fastening position under the loading force of the spring. The snap block and the fastening support wall cooperate to complete the fixation of the snap-fastening unit to the thin wall.

[0004] The existing multi-component combined snap-fastening unit has the following defects: when no compressive force is applied to the snap block, the snap block always remains in the protruding fastening position under the driving force of the spring. Therefore, a bevel surface is required on the snap block. When the snap-fastening unit is snap-fixed to a thin wall, the bevel surface provides guidance for the snap block to slide and yield under the pressure around the through-hole of the thin wall. This makes the force driving the snap block to maintain the snap-fastening on the thin wall become a resistance during the snap-assembly process. The assembly resistance accompanies the entire assembly process, and this resistance continuously increases during the snap-assembly process until the periphery of the through-hole of the thin wall passes over the vertex of the snap block. When a strong snap-holding force is required, it is impossible to have a low resistance to insert the snap-fastening unit into the hole of the thin wall. On the other hand, during occasional maintenance or disassembly, whenever it is necessary to remove the snap-fastening unit from the thin wall, the operator needs to use a separate tool to keep the snap block compressed inside the housing (moreover, due to the existence of the bevel surface, it is also relatively difficult to directly press the snap block by hand, so a tool must also be used to press the snap block), and at the same time, remove the snap-fastening unit from the hole of the thin wall, making the disassembly operation inconvenient. Summary of the Invention

[0005] The object of the present invention: To overcome the defects existing in the prior art, the present invention provides a snap-fastening unit with a function of retracting and holding the snap block, which has the advantages of quick and convenient disassembly and assembly, low pushing and inserting resistance, etc.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A snap-fastening unit for snap-fastening to one or more thin walls with through-holes, comprising a housing and at least one snap block. The housing has a fastening support wall and a head extending away from the fastening support wall. The head has a guiding channel.

[0008] The snap block is restricted to slide directionally on the guiding channel of the head and has a fastening position and a releasing position on the head. In the fastening position, the chuck of the snap block protrudes from the head and cooperates with the fastening support wall correspondingly to form a fastening state that can be clamped and fixed to one or more thin walls. In the releasing position, the chuck of the snap block retracts into the head to form a detachable state in which the head of the snap-fastening unit can freely enter and exit the through-hole of the thin wall.

[0009] The snap block is configured with an elastic element, and the elastic element provides an elastic loading force that drives the snap block to slide to the fastening position and maintain it in the fastening position.

[0010] It is characterized in that: it further includes an automatic locking device, which includes a first locking member arranged on the buckle block and moving with the buckle block, and a second locking member arranged on the head. When the buckle block slides to the release position, the first locking member and the second locking member are automatically locked to lock the buckle block on the head, and at the same time, the elastic element completes energy storage; the automatic locking device also has a trigger member for driving the first locking member and the second locking member to unlock to release the buckle block from the release position. The buckle block released at the release position is driven by the energy storage capacity of the elastic element to reset to the fastening position.

[0011] By adopting the above technical solution, the automatic locking device is used to lock / unlock the buckle block in the release position on the head to realize the retention and release of the buckle block in the release position. When the buckle block slides to the release position, the automatic locking device is automatically locked to complete locking the buckle block on the head to realize retention in the release position (i.e., the buckle block is in the retracted state), achieving the energy storage of the elastic element. During assembly and disassembly, the buckle block can be pre-compressed to the release position in advance, and the buckle block can pass through the through-hole of the thin wall without being compressed around the through-hole on the thin wall, making the fastening installation and disassembly processes smoother and more convenient; this also makes the setting of the fastening force (provided by the elastic element) parameters more flexible; when assembling the buckle fastening unit onto the thin wall, when the head of the buckle fastening unit is inserted into the through-hole of the thin wall and reaches the predetermined position relative to the thin wall, the trigger member drives the automatic locking device to release the buckle block, and the chuck of the buckle block pops out under the action of the energy storage capacity of the elastic element to complete fastening the buckle fastening unit on one or more thin walls.

[0012] Preferably, the triggering member is configured on the snap block and moves with the snap block. The triggering member includes a trigger piece movably disposed on the snap block and a trigger end reset spring for driving the trigger piece to move and reset. The trigger piece has a trigger end for operating the triggering member. The trigger end can protrude and expose from the front end face of the chuck of the snap block under the drive of the trigger end reset spring. The trigger end has an upper trigger surface and a lower avoidance driving surface. A vertex is formed between the upper trigger surface and the lower avoidance driving surface. The upper trigger surface and the lower avoidance driving surface are arranged along the direction of the through hole of the thin wall into which the head is inserted. During the process of the head inserting into and withdrawing from the through hole of the thin wall, the upper trigger surface and the lower trigger surface are directly pressed against the periphery of the through hole of the thin wall, so as to drive the trigger end to retract backward from the front end face of the chuck of the snap block. And during the process of the head being inserted into the through hole of the thin wall, the upper trigger surface is directly pressed against the periphery of the through hole of the thin wall to operate the triggering member to unlock the first locking member and the second locking member. Under this structural design, the triggering member is arranged on the snap block and can be assembled into the housing together with the snap block, which is convenient for product assembly. Moreover, the triggering member adopts a trigger end that can expose the front end face of the chuck of the snap block. During the process of the head inserting into the through hole on the thin wall, the periphery of the through hole of the thin wall presses against the upper trigger surface of the trigger end, and the trigger end is compressed and retracted to the front end face of the chuck of the snap block. The periphery of the through hole of the thin wall passes over the vertex of the trigger end, and at the same time, the snap block is released. The snap block moves to the fastening position under the storage capacity of the elastic element, and the snap fastening unit is fixed on the thin wall, and the operation is simpler; during the process of the head withdrawing from the through hole of the thin wall, the lower avoidance driving surface is pressed against by the periphery of the through hole of the thin wall, so that the trigger end of the triggering member avoids the thin wall, and the periphery of the through hole of the thin wall passes over the vertex of the trigger end. During the disassembly and assembly operation of the snap fastening unit from the thin wall, the force required for the triggering member to trigger is not related to the force for the snap block to reset to the fastening position, and only a relatively small force is required for the triggering member to trigger.

[0013] Preferably, the first locking member includes a movable locking piece movably disposed on the snap block. The movable locking piece is provided with a locking piece spring, and the locking piece spring provides a spring force for driving the movable locking piece to be locked and cooperated with the second locking member. The movable locking piece is driven to act by operating the triggering member, so as to complete the unlocking with the second locking member. Under this structural design, the first locking member configured on the snap block is movably arranged and cooperates with the triggering member to achieve the unlocking of the automatic locking device, and the cooperation is more reliable and convenient.

[0014] Correspondingly, the second locking member is a convex portion or a concave portion formed on the inner wall of the guiding channel of the head. The second locking member can adopt a fixed structure directly formed on the housing, with a simple structure and convenient processing.

[0015] Preferably, the movable locking piece is rotatably configured on the snap block, and the locking portion on the movable locking piece is offset from the rotation center of the movable locking piece. Under this structural design, the movable locking piece rotates, requires a small assembly space, and the movement is more flexible and reliable.

[0016] Preferably, the locking portion is a hook-shaped hook head, and the second locking member is a hooking structure for the hook head to hook. Under this structural design, the locking of the automatic locking device is more stable and reliable.

[0017] Preferably, the trigger member is a lever arm fixed or integrally formed on the movable locking member. The lever arm and the movable locking member form a lever structure with a pivot fulcrum located between the lever arm and the hook head. The locking member spring also serves as a reset spring for driving the trigger end of the lever arm to the non-trigger state, and the lower avoidance driving surface is a convex arc-shaped curved surface. Under this structural design, the trigger member and the movable locking member form a single accessory with synchronous actions, constituting a lever structure, which is simple and compact. The lower avoidance driving surface is a convex arc-shaped curved surface, ensuring that the trigger end can be pushed by the thin wall to drive the lever arm to swing.

[0018] Preferably, the locking member spring is a compression coil spring. One end of the compression coil spring abuts against the buckle block, and the other end of the compression coil spring abuts against the lever arm. The lever arm is hook-shaped, and the compression coil spring is correspondingly located within the hook opening of the lever arm. Under this structural design, the installation and arrangement of the locking member spring are convenient and reliable.

[0019] Preferably, the buckle block is recessed with an assembly groove in the thickness direction, and correspondingly, a raised portion surrounding the assembly groove is formed on the buckle block. The clamping surface of the chuck extends to the raised portion, and both the first locking member and the trigger member are arranged in the assembly groove. Under this structural design, both the first locking member and the trigger member are arranged in the assembly groove, and no additional space needs to be reserved in the guiding channel of the housing. The overall structure is compact, the processing and assembly are convenient, the positioning and sliding of the buckle block are more stable and reliable, and in addition, the width dimension of the clamping surface on the buckle block is ensured.

[0020] Preferably, the front end surface of the chuck has a flat end surface extending from the side close to its clamping surface to the side far from the clamping surface along the height direction of the buckle block. Under this structural design, the flat end surface is convenient for pinching the buckle block by hand and directly compressing the buckle block into the guiding channel, which has the advantage of convenient operation.

[0021] Preferably, a chamfered surface is provided at the end corner of the head corresponding to the port of the guiding channel and far from the fastening support wall. Under this chamfered surface, when the buckle block is in the loosening position, a part of the flat end surface can protrude out of the port of the guiding channel through the chamfered surface. Under this structural design, it is convenient to compress the buckle block in place at the end far from the clamping surface.

[0022] Preferably, a single guide channel is provided on the head, and two buckle blocks arranged in opposite directions are provided in the single guide channel, each buckle block is provided with an elastic element, and the two buckle blocks are stacked and arranged in the guide channel along the thickness direction, and waist-shaped holes adapted to the sliding stroke of the buckle blocks are provided on the buckle blocks, and a limit pin is fixed on the head, and the limit pin passes through the waist-shaped hole of the buckle block to limit the buckle block to slide in a directional manner on the head. Under this structural design, a double buckle block design is adopted, and the arrangement structure of the double buckle blocks is compact.

[0023] Preferably, the buckle block is provided with a tool coupling portion that can be engaged with a tool to move the buckle block to the release position with the help of the tool, and an operation window for exposing the tool coupling portion is provided on the head, and the operation window is located on the side of the fastening support wall away from the clamping surface of the buckle block, and the operation window can be covered by a detachable cover plate or directly opened on the head. Under this structural design, in certain applications, when the raised end of the head cannot be directly approached, the buckle block can be compressed by the tool from the other side of the head, thereby completing the movement of the buckle block to the release position and locking it, and then the buckle fastening unit can be conveniently pulled out from the through hole of the thin wall.

[0024] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1a This is a diagram of the buckle fastening unit in the unfolded state (the buckle block is in the fastening position) of the first embodiment of the present invention;

[0026] Figure 1b Based on Figure 1a E-direction view;

[0027] Figure 1c For along Figure 1b A sectional view taken along the cutting line AA;

[0028] Figure 2a This is a diagram of a buckle fastening unit in a retracted state (the buckle block is in a released position) according to an embodiment of the present invention;

[0029] Figure 2b Based on Figure 2a F-direction view;

[0030] Figure 2c For along Figure 2b A sectional view taken along the cutting line BB;

[0031] Figure 3 An exploded view of a buckle fastening unit according to a first embodiment of the present invention;

[0032] Figures 4a to 4c It is a schematic diagram of a buckle fastening process between a buckle fastening unit and a thin wall according to a first embodiment of the present invention;

[0033] Figures 5a to 5f Schematic diagram of the disengagement operation process between the snap-fastening unit and the thin wall in the first embodiment of the present invention;

[0034] Figure 6 Schematic diagram of another snap-fastening unit structure that can be disassembled with the aid of tools provided by the present invention;

[0035] Figure 7 Schematic diagram of another snap-fastening unit structure that can be disassembled with the aid of tools provided by the present invention;

[0036] Figure 8a Diagram of the retracted state of the snap-fastening unit in the fourth embodiment of the present invention (the snap block is in the released position);

[0037] Figure 8b Diagram of the snap-fastening unit in the fourth embodiment of the present invention in the triggered state;

[0038] Figure 8c Diagram of the snap-fastening unit in the fourth embodiment of the present invention in the deployed state (the snap block is in the fastened position);

[0039] Figure 8d Exploded view of the snap-fastening unit in the fourth embodiment of the present invention;

[0040] Figure 9a Diagram of the retracted state of the snap-fastening unit in the fifth embodiment of the present invention (the snap block is in the released position);

[0041] Figure 9b Diagram of the snap-fastening unit in the fifth embodiment of the present invention in the triggered state;

[0042] Figure 9c Diagram of the snap-fastening unit in the fifth embodiment of the present invention in the deployed state (the snap block is in the fastened position);

[0043] Figure 10a Diagram of the retracted state of the snap-fastening unit in the sixth embodiment of the present invention (the snap block is in the released position);

[0044] Figure 10b Diagram of the snap-fastening unit in the sixth embodiment of the present invention in the triggered state;

[0045] Figure 10c Diagram of the snap-fastening unit in the sixth embodiment of the present invention in the deployed state (the snap block is in the fastened position);

[0046] Figure 10d Schematic diagram of the snap-fastening unit in the sixth embodiment of the present invention in the disassembled state;

[0047] Figure 11Schematic diagram of another technical solution adjusted based on Embodiment 5 of the present invention. Detailed implementation mode Embodiment 1

[0048] See Appendix Figures 1a to 5f , a snap fastening unit disclosed by the present invention is used for snap fastening to one or more thin walls with through holes (it should be noted that multiple means two or more, and the same applies to similar expressions such as "multiple thin walls" that appear below). This snap fastening unit can be an independent component that connects two (refer to Figures 4a to 5f ) or more thin walls 1-1 with through holes together (refer to Figure 6 ); this snap fastening unit can also be integrated into a larger unit and serve as a part of a larger unit (such as devices like latches, hinges, handles, doors, etc.) to help fix such large items to the frame through the through holes (such as clamping openings, card holes) on the thin walls carried on the frame; the snap fastening unit includes a housing 1 and at least one snap block 2. Due to the application scenarios of the snap fastening unit, the structural form of the housing 1 is not only the independent housing form shown in the existing drawings but can also change to be a part of other devices (such as handles, doors, hinges, etc.). The housing 1 has a fastening support wall 11 and a head 12 extending away from the fastening support wall 11. The head 12 has a guiding channel 121. The snap block 2 is restricted to slide directionally on the guiding channel 121 of the head 12. The snap block 2 has a chuck 21, and the chuck 21 is used to press the thin wall 1-1 against the fastening support wall 11 to achieve snap fastening to the thin wall 1-1. The snap block 2 has a fastening position (such as Figures 1a to 1c and Figure 4c ) and a release position (such as Figures 2a to 2c and Figure 4a , Figure 5c), when the snap block 2 is in the fastening position, the chuck 21 extends out of the opening of the guiding channel 121 and cooperates with the fastening support wall 11 correspondingly to be clamped and fixed on one or more thin walls 1-1, which can be called that the snap fastening unit is in the fastening state. In the loosening position, the chuck 21 of the snap block retracts into the head so that the snap fastening unit can freely enter and exit the through hole of the thin wall 1-1, which can be called that the snap fastening unit is in the detachable state. The snap block 2 is configured with an elastic element 3, and the elastic element 3 provides an elastic loading force that drives the snap block 2 to slide to the fastening position and stay at the fastening position. The elastic element 3 usually adopts a compression coil spring, so that the elastic element can be installed by means of the dimension space in the sliding direction of the snap block. For example, in this specific embodiment, a spring installation hole for placing the elastic element 3 is provided on the snap block 2. To improve the deficiencies of the existing snap fastening unit, the snap fastening unit is equipped with an automatic locking device, and the automatic locking device is used to lock the snap block that slides to the loosening position to keep the snap fastening unit in the loosening state (that is, the snap block retracts into the housing state), so that when the head of the snap fastening unit is inserted into the through hole of the thin wall for fastening assembly, there is no need to push the snap block 2 to retract, and the disassembly and assembly operations of the snap fastening unit avoid the elastic loading force of the elastic element. Specifically: the automatic locking device includes a first locking member 41 provided on the snap block 2 and moving with the snap block 2, and a second locking member 42 provided on the head 12. When the snap block 2 slides to the loosening position, the first locking member 41 and the second locking member 42 are automatically locked to lock the snap block 2 on the head 12, and at the same time the elastic element 3 completes energy storage; the automatic locking device also has a trigger member for driving the first locking member 41 and the second locking member 42 to unlock to release the snap block 2 from the loosening position. The snap block 2 released from the loosening position is driven by the stored energy of the elastic element 3 to reset to the fastening position.

[0049] The automatic locking device automatically interlocks to complete locking the snap block on the head and staying in the loosening position, and achieving energy storage of the elastic element. In this way, the snap fastening unit constitutes a mechanism with a locking function and capable of internal energy storage. During assembly and disassembly, the snap block can be pre-compressed to the loosening position. The first locking member 41 and the second locking member are driven by the trigger member to unlock, so as to release the snap block. The snap block moves under the action of the stored energy of the elastic element until the chuck 21 pops out. The chuck 21 of the snap block extends to the fastening position to complete fixing the snap fastening unit on the thin wall, making the snap block controllable. During the installation of the thin wall, there is no need to bear the resistance that forces the snap block to retract to the loosening position, significantly reducing or eliminating all the thrust required to assemble the snap fastening unit onto the thin wall, making the fastening installation process smoother and more convenient. Similarly, during disassembly, the snap block is compressed to stay in the loosening position, and there is no need to rely on tools manually to keep the snap block in the loosening position, greatly facilitating the operation of disassembling the snap fastening unit; similarly, this also makes the setting of the fastening force (provided by the elastic element 3) parameters more flexible.

[0050] To make the buckle fastening process more convenient, when the buckle block 2 is locked in the release position, the trigger end on the trigger member protrudes from the head 12. During the process of inserting the buckle fastening unit along the head 12 into the through hole of the thin wall 1-1, the trigger end is exposed around the through hole of the thin wall 1-1. Thus, during the process of pushing and inserting the head into the through hole of the thin wall, the thin wall 1-1 directly applies contact pressure to the trigger end of the trigger member to complete the triggering operation for unlocking the automatic locking device, and the buckle fastening and installation process is smoother; although driving the trigger member through the thin wall 1-1 will encounter resistance from the trigger member, and before the head reaches the fastening position fastened to the thin wall 1-1 during the triggering operation, the buckle block will press against the periphery of the hole in the thin wall, the remaining stroke of the thin wall 1-1 entering the fastened position can be designed to be shorter, and the front side 21a of the chuck 21 adopts a flat surface. Even if the released buckle block presses against the periphery of the thin wall through hole with a large contact pressure, the remaining stroke of entering the thin wall through hole is also relatively easy.

[0051] Therefore, those skilled in the art, according to the prior art and under the guidance of the essential spirit of the present invention, as an alternative implementation manner, can design a trigger member that is independent of direct contact triggering around the thin wall. That is to say, after completely inserting the head of the buckle fastening unit into the through hole of the thin wall, the trigger member can be artificially triggered through an auxiliary actuator, such as a squeeze button, a wire, or a magnetic field signal.

[0052] The triggering member is configured on the snap block 2 and moves with the snap block 2. By associating the triggering member with the snap block, the triggering member and the snap block can be associated in a modular form, facilitating the assembly operation of the product. The triggering member includes a trigger 43 movably configured on the snap block 2 and a trigger end return spring 44 for driving the trigger 43 to move and reset. The trigger 43 has a trigger end for operating the triggering member. Driven by the trigger end return spring 44, the trigger end protrudes and exposes from the front end face 21a of the chuck 21 of the snap block 2. The position where the trigger end protrudes from the front end face 21a of the chuck 21 of the snap block 2 is defined by a stop limiting structure (such as a wall 1210 in this specific embodiment) in the guiding channel 121. The trigger end has an upper trigger surface 431 and a lower avoidance driving surface 432. A vertex Q is naturally formed at the connection of the upper trigger surface 431 and the lower avoidance driving surface 432. The upper trigger surface 431 and the lower avoidance driving surface 432 are arranged along the direction in which the head 21 is inserted into the through-hole of the thin wall 1-1. During the process of the head 21 inserting into and withdrawing from the through-hole of the thin wall 1-1, the periphery of the through-hole of the thin wall 1-1 can press against the trigger end of the trigger member to cause the trigger end to retract backward from the front end face of the chuck of the snap block. In this way, the periphery of the through-hole of the thin wall 1-1 can pass over the vertex Q of the trigger end. Moreover, during the process of the head 12 being inserted into the through-hole of the thin wall 1-1, the upper trigger surface 431 is directly pressed by the periphery of the through-hole of the thin wall 1-1 to operate the triggering member to unlock the first locking member 41 and the second locking member 42. When assembling the snap fastening unit, the head is inserted into the through-hole of the thin wall. When inserted to a certain position, the upper trigger surface 431 contacts the periphery of the through-hole of the thin wall. Continuing to push the head into the through-hole of the thin wall, the periphery of the through-hole of the thin wall presses against the upper trigger surface 431, causing the triggering member to act, and the trigger end retracts backward from the front end face of the chuck of the snap block until the periphery of the through-hole of the thin wall reaches the vertex position, causing the trigger end to avoid the periphery of the through-hole of the thin wall. At the same time, the first locking member and the second locking member are unlocked, and the snap block is released. Then the head is inserted in place, and the snap block moves to the fastening position, completing the fastening of the snap fastening unit to the thin wall (see Figure Figures 4a to 4c ); during the disassembly operation, when the head is withdrawn from the through-hole of the thin wall to a certain position, the lower avoidance driving surface 432 contacts the periphery of the through-hole of the thin wall. Continuing to pull the head out of the through-hole of the thin wall, the periphery of the through-hole of the thin wall presses against the lower avoidance driving surface, causing the triggering member to act and avoid until the periphery of the through-hole of the thin wall reaches the vertex position until the head is completely pulled out of the through-hole of the thin wall, (such as Figures 5a to 5fas shown); under the guidance of the present invention, those skilled in the art can also configure the trigger member on the housing, but this requires separately assembling the trigger member and the snap block onto the housing, and also requires reserving a structure for installing the trigger member on the housing, which will cause inconvenience in processing, assembly, and structural design. An assembly groove 22 is recessed in the snap block 2 in the thickness direction, and a raised portion 23 surrounding the assembly groove 22 is formed on the snap block 2 accordingly. The clamping surface 211 of the chuck 21 extends to the raised portion 23, and both the first locking member 41 and the trigger member are arranged in the assembly groove 22. Since both the first locking member and the trigger member are arranged in the assembly groove 22, no additional space needs to be reserved in the guiding channel 121 of the housing, the overall structure is compact, the processing and assembly are convenient, the positioning and sliding of the snap block are more stable and reliable, and in addition, the width dimension of the clamping surface 211 on the snap block is ensured.

[0053] In this specific embodiment, the first locking member 41 includes a movable locking member 411 rotatably disposed on the buckle block 2. The movable locking member 411 is mounted on the buckle block 2 via a pivot shaft 413. The locking portion 4111 on the movable locking member 411 is offset from the rotation center of the movable locking member 411. The locking portion 4111 can swing around the pivot shaft of the movable locking member 411. The locking portion 4111 is a hook-shaped hook head. The movable locking member 411 is provided with a locking member spring 412. The locking member spring 412 provides a spring force for driving the movable locking member 411 to be locked and cooperated with the second locking member 42. The actuating trigger member is operated to the trigger state to drive the movable locking member 411 to act, thereby completing the unlocking with the second locking member 42. With the design of the above-mentioned assembly groove 22 on the buckle block 2, the second locking member 42 is a convex portion formed on the inner wall of the guiding channel 121 of the head 21. The convex portion is inserted into the assembly groove 22 to achieve a compact fit. Of course, in the present invention, the second locking member 42 is a concave portion formed on the inner wall of the guiding channel 121 of the head 21 to adapt to different structures and cooperation forms of the movable locking member 411. Specifically, for example, when there is no design of the assembly groove on the buckle block and an avoidance recess is designed in the head, the second locking member 42 can be a concave portion formed on the inner wall of the guiding channel 121 of the head 21. The movable locking member 411 is driven by the locking member spring 412 to automatically hook the hook head (locking portion 4111) into the second locking member 42 when sliding to the release position on the buckle block 2. The locking member spring 412 can be a compression spring, a tension spring or a torsion spring. The compression spring design is preferred. The movable locking member 411 is driven by the trigger member 43 to swing against the force of the locking member spring 412 so that the hook head (locking portion 4111) of the movable locking member 411 disengages from the convex portion (second locking member 42). The hook head tends to buckle towards the convex portion under the drive of the locking member spring 412. Thus, when the buckle block slides to the release position, the movable locking member 411 is under the force of the locking member spring 412, and its hook head automatically hooks into the convex portion to achieve self-locking. The specific process of its automatic locking is as follows: when the buckle block 2 is about to slide to the release position, the hook head reaches the position of the convex portion. The hook head (locking portion 4111) is pushed and lifted by the convex portion to jump. And when the buckle block 2 slides to the release position, the hook head (locking portion 4111) automatically hooks into the convex portion to complete the locking hook under the drive of the locking member spring 412. The trigger member is pressed, so that the hook head (locking portion 4111) of the movable locking member 411 swings out of the convex portion, thereby releasing the buckle block. The buckle block automatically slides to the fastening position under the action of the energy storage spring force. The automatic locking device uses the rotating movable locking member 411 to hook on the convex portion to complete the locking (such as Figures 5b to 5c), in order to facilitate the hook head (the locking part 4111) to be pushed by the convex part when the hook head (the locking part 4111) contacts the convex part, it is easy to think of having an inclined surface on the convex part, and the hook head (the locking part 4111) having an arc-shaped outer contour. The rotating movable locking member 411 has the advantages of sensitive and reliable operation, and realizes locking in the form of hooking with the hook head, and the work is reliable. When the buckle block does not enter the release position, the hook head (the locking part 4111) is limited by the wall in the assembly groove to support the hook head (this limit is used to maintain the position of the hook head, and the structural form can also be the rotation angle limit structure of other rotating parts), so that the hook head can be in a state of being able to hook on the convex part.

[0054] Of course, under the guidance of the present invention, those skilled in the art can also select corresponding alternative solutions in the existing locking structures. For example, the form of the first locking member and the second locking member 42 can also be the form of the cooperation between the sliding lock tongue and the lock hole. In addition, it is easy for those skilled in the art to think that the structural forms of the first locking member and the second locking member 42 can be interchanged. For example, in the specific embodiment provided, the first locking member is the movable locking member 411 with a hook head (the locking part 4111), and the second locking member is the convex part. The solution can also be adjusted to that the first locking member is the convex part or the concave part, the convex part or the concave part is arranged on the buckle block, and the second locking member 42 includes the movable locking member 411 with a hook head (the locking part 4111), and the movable locking member is installed on the head. However, the structural design of arranging the first locking member 41 as a movable locking member on the buckle block 2 and arranging the trigger member and the first locking member on the buckle block 2 can facilitate the assembly operation of the buckle fastening unit. At the same time, in view of the fact that the buckle block is usually designed in a flat shape, the lock hook member is arranged to be able to rotate around the axis along the thickness direction of the buckle block (the X-axis direction in the figure); that is, the axial direction of the pivot axis of the movable locking member 411 is arranged along the thickness direction of the buckle block.

[0055] Furthermore, the trigger member 43 adopts a single-component design that synchronizes with the movable locking member, rather than a structural member that moves independently of the movable locking member. Specifically: the trigger member 43 is a lever arm fixed or integrally formed on the movable locking member 411. The lever arm (the trigger member 43) and the movable locking member 411 form a lever structure with the pivot fulcrum located between the lever arm (the trigger member 43) and the hook head (the locking part 4111). The locking member spring 412 also serves as the trigger end reset spring 44 that drives the lever arm to the non-trigger state. The lower avoidance driving surface 432 is a convex arc-shaped curved surface. According to the lever principle, those skilled in the art can obtain the curvature of the required convex arc-shaped curved surface and the distance parameter between the pivot fulcrum and the convex arc-shaped curved surface through parameter calculation and limited experiments.

[0056] For the convenience of the installation and arrangement of the lock spring 412, the lock spring 412 is a compression coil spring. One end of the compression coil spring abuts against the snap block 2, and the other end of the compression coil spring abuts against the trigger member 43. The trigger member 43 is in a hook shape, and the compression coil spring is correspondingly located within the hook opening of the trigger member 43. Of course, as easily conceivable to those skilled in the art, the lock spring 412 can also be a torsion spring. Additionally, one end of the compression coil spring can also abut against a wall of the guiding channel, and corresponding walls need to be formed within the guiding channel, which will make the structure more complex.

[0057] Since there is no need for the thin wall of the snap block to press against it to achieve the requirement of being pressed to the release position, the inclined surface specifically provided for the thin wall to press against on the traditional snap block is no longer needed. Therefore, in this specific embodiment, the front end surface of the chuck 21 has a flat end surface 212 extending along the height direction of the snap block from the side close to its clamping surface 211 to the side away from the clamping surface 211. Compared with the inclined surface design of the snap block on the existing snap fastening unit, the flat end surface is more conducive to pinching the snap block by hand, providing the possibility and convenience for directly compressing the snap block into the guiding channel in some application scenarios of the snap fastening unit.

[0058] To further facilitate pressing the snap block, a chamfered surface 122 is provided at the end corner of the head 12 corresponding to the port of the guiding channel 121 away from the fastening support wall 11. Under this chamfered surface 122, when the snap block 2 is in the release position, a part of the flat end surface 212 can protrude out of the head 12 through the chamfered surface 122 (as Figure 2a shown). In this way, even when the snap block is in the release position, a part of the chuck 21 can be exposed out of the guiding channel port through the chamfered surface, facilitating the compression of the snap block in place.

[0059] For the convenience of the compact installation and easy installation of the snap block, two snap blocks 2 arranged in opposite directions are provided within a single guiding channel 121. The two snap blocks 2 are stacked in the thickness direction within the guiding channel. Each snap block 2 is configured with an elastic element 3. A waist-shaped hole adapted to the sliding stroke of the snap block 2 is provided on the snap block 2. A limit pin 13 is fixed on the head 12, and the limit pin 13 passes through the waist-shaped hole of the snap block to limit the snap block 2 on the head 12. It has the advantage of a compact structure. Of course, those skilled in the art can also adopt a single snap block 2 in combination with the existing technology according to the present invention.

[0060] As Figure 6 and Figure 7In some applications, when it is impossible to directly touch the extended end of the head protrusion, such as the thin-walled hole is a blind hole, and the head is inserted into the blind hole, in order to enable the buckle block to still be compressed to the loosened position, the technical solutions of the second embodiment and the third embodiment can be well applied, and a tool coupling portion 24 is provided on the buckle block 2 for engaging with a tool to achieve the purpose of sliding the buckle block 2 to the loosened position with the help of the tool. The tool coupling portion 24 can be a recess or a protrusion, and an operation window 123 for exposing the tool coupling portion 24 is provided on the head 12. The operation window 123 is located on the side of the fastening support wall 11 away from the clamping surface 211 of the buckle block 2, that is, the operation window is formed on the side facing the opposite direction of the head protrusion, and the buckle block can be compressed by means of a tool through the other side of the head. The operation window 123 can be covered by a detachable cover plate 14 (such as Figure 6 As shown) or directly open and set on the head 12 (as shown Figure 7 as shown). Embodiment 4

[0061] like Figures 8a to 8d As shown, the snap-on fastening unit provided in this specific embodiment is mainly different from that in the specific embodiment one in that the structures of the trigger member, the first locking member and the second locking member 42 are different. A person skilled in the art can know the contents of the corresponding parts by combining the drawings and the description of the specific embodiment one. For the convenience of briefly explaining the scheme of this specific embodiment, the same parts of this specific embodiment and the specific embodiment one will not be repeated.

[0062] In this specific embodiment, the trigger member is also arranged on the buckle block, the first lock hook member also adopts a rotating movable lock member design, and the buckle block is also designed with an assembly groove for assembling the trigger member and the first lock hook member; the difference lies in that: the trigger member 43 is a sliding member slidably arranged on the buckle block 2, the sliding direction of the trigger member 43 is consistent with the sliding direction of the buckle block 2, one end of the trigger member 43 has a trigger end, and the other end of the trigger member has a driving end 433, the locking portion 4111 on the movable lock member 411 is an abutting end on the movable lock member 411, and the movable lock member 411 is actuated by the locking portion 4111. The lock element 411 is provided with a tripping action part 4112 which is transmission-connected with the driving end part 433. The tripping action part 4112 is a pushing arm on the movable lock element 411. The driving end part cooperates with the pushing arm in pushing. The trigger end return spring 44 is a coil spring abutting against the trigger element 43. Of course, since the trigger element 43 is linked with the movable lock element 411, the function of the trigger end return spring can also be realized through the lock element spring 412, that is, the lock element spring 412 can be used as the trigger end return spring at the same time, and the specially designed trigger end return spring (such as the one in the appended drawing of this specific embodiment) can be omitted. Figure 11Another variant provided in ), but the existence of the special trigger end return spring 44 can better press the trigger member to a certain position, prevent the trigger member from moving, and reduce noise. The second lock member 42 is a concave portion formed by the inner wall of the guide channel 121, and the concave portion has a stop surface 421 for the abutment end to abut. The upper trigger surface 431 and the lower avoidance drive surface 432 are both inclined surfaces designed for thin wall contact pressure. When the snap block 2 slides to the release position, the locking portion 4111 falls into the recess under the drive of the lock spring 412, and the locking portion abuts against the stop surface 421 under the drive of the elastic element to lock the snap block 2 in the release position; when the trigger member performs a triggering operation, the periphery of the thin-walled through hole presses against the upper trigger surface 431 or the lower avoidance drive surface 432, the trigger slides, and pushes the movable lock 411 to rotate, and the locking portion 4111 of the movable lock swings out of the stop surface 421, so that the automatic locking device is unlocked, and the snap block 2 is released. Under the storage capacity of the elastic element, the snap block 2 is reset to the fastened position. Among them, the other end of the lock spring 412 opposite to the end abutting against the movable lock 411 can abut against the snap block, so that the lock spring accommodating part of the assembly groove has a cut-off spring support wall; or as shown in the attached Figure 11 As shown, the lock spring accommodating portion of the assembly groove adopts an open mouth through which one end of the lock spring can extend, and the end of the lock spring abuts against the wall of the guide channel. The advantage of this design is that in the initial stage of assembly of the lock spring, it does not need to be deliberately compressed. In the subsequent operation of assembling the snap block into the shell, the lock spring also does not provide spring force to the movable lock 411, and there is no need to deliberately press the movable lock 411, making the assembly operation more convenient.

[0063] Among them, a stop protrusion 1211 for stopping the abutting end is provided in the guide channel 121. The abutting end enters the corresponding position of the stop protrusion 1211 under the drive of the lock spring 412 to prevent the buckle block 2 from falling out of the guide channel under the action of the elastic element. Figures 9a to 9c The present invention also provides a solution of the specific embodiment 5. When the buckle block is disassembled, the abutting end of the movable lock can be pressed to enable the abutting end to pass over the anti-slip protrusion 1211. In this way, compared with the designs of the specific embodiments 1 to 3 and the designs in the prior art, this specific implementation scheme does not require additional accessories to keep the buckle block 2 in the housing 1. Embodiment 5

[0064] The main difference between the technical solution of this embodiment and that of the fourth specific embodiment lies in the different transmission connection structures between the trigger member and the movable locking member. In this specific embodiment, the tripping action portion 4112 on the movable locking member 411 that is in transmission connection with the driving end portion 433 is designed with a gear surface, and the driving end portion 433 on the trigger member is a rack meshing with the gear surface. Since the trigger member 43 and the movable locking member 411 are in gear transmission, under this transmission connection, the design of a single spring can be used for the reset driving of both the trigger member 43 and the movable locking member 411 at the same time. Embodiment Six

[0065] As Figures 10a to 10c shown, the main difference between the snap fastening unit provided in this specific embodiment and that of the first specific embodiment lies in the different structural forms of the trigger member, the first locking member, and the second locking member 42. Those skilled in the art can understand the corresponding parts in combination with the drawings and the description of the first specific embodiment. For the sake of concisely explaining the solution of this specific embodiment, the same parts of this specific embodiment and the first specific embodiment will not be described again.

[0066] In this specific embodiment, the triggering member is also arranged on the buckle block 2, and the first locking hook member also adopts a design of a rotating movable locking member. An assembly groove for assembling the triggering member and the first locking hook member is also designed on the buckle block 2, etc. The difference is that the locking portion 4111 on the movable locking member 411 is an abutting end portion located on the side of the rotation center of the movable locking member 411 (as shown in the position of the central rotating shaft 413), the second locking member 42 is a recess formed by concave-converting the inner wall of the guiding channel 121, and the recess has a stop surface 421 for the abutting end portion to abut against. A sliding slot 4113 is arranged on the movable locking member 411, and the sliding slot 4113 is located between the locking portion 4111 and the rotation center of the movable locking member 411 (as shown in the position of the central rotating shaft 413). An inserting arm 434 is arranged on the triggering member 43, and the inserting arm 434 of the triggering member 43 is slidably inserted into the sliding slot 4113, constituting a relative sliding fit between the triggering member 43 and the movable locking member 411. The inserting arm 434 of the triggering member 43 abuts against the side wall 41131 of the sliding slot 4113 close to the movable locking member 411, so as to constitute a linkage between the triggering member 43 and the movable locking member 411 in the rotation direction. Thus, when the head 12 is inserted into the through hole of the thin wall 1-1, the periphery of the through hole on the thin wall 1-1 presses against the triggering surface 431, and the triggering member 43 can push against the wall of the sliding slot 4113 through the inserting arm 434, so as to drive the movable locking member 411 to rotate until the abutting end portion disengages from the stop surface 421, completing the release of the buckle block 2 (as shown in Figures 10a to 10c); when the movable locking member 411 is driven by the locking member spring 412 to rotate and reset, the wall of the sliding slot 4113 of the movable locking member 411 pushes against the inserting arm 434 to drive the triggering member 43 to rotate and reset by the movable locking member 411. The triggering end reset spring 44 is arranged between the triggering member 43 and the movable locking member 411, that is, one end of the triggering end reset spring 44 abuts against the triggering member 43, and the other end of the triggering end reset spring 44 abuts against the movable locking member 411. A guiding wall 221 for restricting the rotation of the triggering member 43 and guiding the linear sliding of the triggering member 43 is arranged on the buckle block 2. Under the design of the assembly groove 22, the guiding wall 221 is a part of the wall of the assembly groove 22, and the molding is more convenient; such as Figure 10dAs shown, under the setting of the guiding wall 221, when the head 12 is disengaged from the through hole of the thin wall 1-1, during the process, the lower avoidance driving surface 432 presses against the periphery of the through hole of the thin wall 1-1. The trigger member 43 can only slide, and the trigger end of the trigger member 43 retracts backward from the front end surface of the chuck 21 of the snap block 2, and cannot drive the movable locking member 411 to rotate. That is, only the sliding avoidance of the trigger member 43 occurs, while the first locking member and the second locking member remain in the locked state. This enables the snap fastening unit to still be in the snap block locked state after disassembly, facilitating the next installation operation. The upper trigger surface 431 and the lower avoidance driving surface 432 are both designed as inclined surfaces for the thin wall to press against. When the snap block slides to the release position, the locking portion 4111 falls into the recess under the drive of the locking member spring, and the locking portion abuts against the stop surface 421 under the drive of the elastic element to lock the snap block in the release position. When the trigger member performs a triggering operation, the periphery of the through hole of the thin wall presses against the upper trigger surface 431, the trigger member slides, and the movable locking member is pushed to rotate through the insertion arm 434. The locking portion 4111 of the movable locking member swings out of the stop surface 421, unlocking the automatic locking device, releasing the snap block, and under the storage capacity of the elastic element, the snap block resets to the fastening position.

[0067] Wherein, a retaining protrusion 1211 for retaining the abutting end is provided in the guiding channel 121. The abutting end enters the corresponding position of the retaining protrusion 1211 under the drive of the locking member spring 412, preventing the snap block from disengaging from the guiding channel under the action of the elastic element. When the snap block is disassembled and assembled, the abutting end of the movable locking member can be pressed, enabling the abutting end to cross over the retaining protrusion 1211.

[0068] The snap fastener of the present invention has the following advantages: 1) The snap block can be locked in the release position, enabling the snap fastening unit to be pre-locked when disassembling and assembling. The snap block of the snap fastening unit is in a retracted state, making installation and disassembly convenient. Although the trigger member of the automatic locking device will form a certain blockage to the thin wall (the trigger member needs to be pressed by the periphery of the through hole of the thin wall to unlock the automatic locking device), this resistance is different from the snap fastening loading force of the snap fastening unit, and the triggering force required for the automatic locking device is small. 2) The first locking member of the automatic locking device is a movable component, and the first locking member and the component applying an action to the first locking member (the trigger member) are both arranged on the snap block, achieving integrated assembly and then being assembled on the head, which has the advantage of convenient assembly operation. Moreover, the assembled structural form is a channel combined with the waist-shaped hole and the cross pin on the snap block, or a retaining protrusion design in the channel, and the assembly operation is simple and convenient. 3) Since the snap block can be pre-locked in the release position, the inclined surface design on the traditional snap block can be eliminated and a flat end surface design can be adopted. The operator can more easily and conveniently directly pinch the snap block to complete the retraction operation of the snap block. This further facilitates the use convenience of the snap fastener in some occasions.

Claims

1. A snap fastening unit for snap-fastening to one or more thin walls with through holes, comprising a housing and at least one snap block. The housing has a fastening support wall and a head extending away from the fastening support wall. There is a guiding channel on the head. The snap block is restricted to slide directionally on the guiding channel of the head and has a fastening position and a releasing position on the head. In the fastening position, the chuck of the snap block protrudes from the head and cooperates with the fastening support wall correspondingly to form a fastening state that can be clamped and fixed to one or more thin walls. In the releasing position, the chuck of the snap block retracts into the head to form a detachable state in which the head of the snap fastening unit can freely enter and exit the through hole of the thin wall. The snap block is configured with an elastic element, and the elastic element provides an elastic loading force that drives the snap block to slide to the fastening position and remain in the fastening position. It is characterized in that: It further includes an automatic locking device. The automatic locking device includes a first locking member arranged on the buckle block and moving with the buckle block, and a second locking member arranged on the head. When the buckle block slides to the release position, the first locking member and the second locking member are automatically locked to lock the buckle block on the head, and at the same time, the elastic element completes energy storage. The automatic locking device also has a triggering member for driving the first locking member and the second locking member to unlock to release the buckle block from the release position. The buckle block released at the release position is driven by the energy storage of the elastic element to reset to the fastening position.

2. The snap fastening unit according to claim 1, wherein: The triggering member is arranged on the buckle block and moves with the buckle block. The triggering member includes a trigger piece movably arranged on the buckle block and a trigger end reset spring for driving the trigger piece to move and reset. The trigger piece has a trigger end for operating the triggering member. The trigger end can protrude and expose from the front end face of the chuck of the buckle block under the drive of the trigger end reset spring. The trigger end has an upper trigger surface and a lower avoidance driving surface. A vertex is formed between the upper trigger surface and the lower avoidance driving surface. The upper trigger surface and the lower avoidance driving surface are arranged along the direction of the through hole of the thin wall into which the head is inserted. During the process of the head inserting into and withdrawing from the through hole of the thin wall, the upper trigger surface and the lower trigger surface are directly pressed against the periphery of the through hole of the thin wall to drive the trigger end to retract backward from the front end face of the chuck of the buckle block. And during the process of the head being inserted into the through hole of the thin wall, the upper trigger surface is directly pressed against the periphery of the through hole of the thin wall to operate the triggering member to unlock the first locking member and the second locking member.

3. The snap fastening unit according to claim 2, characterized in that: The first locking member includes a movable locking piece movably arranged on the buckle block. The movable locking piece is provided with a locking piece spring. The locking piece spring provides a spring force for driving the movable locking piece to be locked and cooperate with the second locking member. The movable locking piece is driven to act by operating the triggering member, so as to complete unlocking with the second locking member.

4. The snap fastening unit according to claim 3, characterized in that: The second locking member is a convex part or a concave part formed on the inner wall of the guiding channel of the head.

5. The snap fastening unit according to claim 3, wherein: The movable locking piece is rotationally arranged on the buckle block, and the locking part on the movable locking piece is offset from the rotation center of the movable locking piece.

6. The snap fastening unit according to claim 5, characterized in that: The locking part is a hook-shaped hook head, and the second locking member has a hooking structure for the hook head to hook.

7. The snap fastening unit according to claim 6, characterized in that: The trigger piece is a lever arm fixed or integrally formed on the movable locking piece. The lever arm and the movable locking piece form a lever structure with a pivot fulcrum located between the lever arm and the hook head. The locking piece spring also serves as the trigger end reset spring for driving the lever arm to the non-trigger state. The lower avoidance driving surface is a convex arc-shaped curved surface.

8. The snap fastening unit according to claim 7, wherein: The locking piece spring is a compression coil spring. One end of the compression coil spring abuts against the buckle block, and the other end of the compression coil spring abuts against the lever arm. The lever arm is hook-shaped. The compression coil spring is correspondingly located in the hook opening of the lever arm.

9. The snap-fastening unit according to claim 5, wherein: The trigger member is a sliding member slidably configured on the buckle block, and the sliding direction of the trigger member is consistent with the sliding direction of the buckle block. One end of the trigger member has a trigger end for operating the trigger member to a trigger state, and the other end of the trigger member has a driving end. The locking portion is an abutting end on the movable locking member, and the movable locking member is provided with a tripping action portion transmission-connected to the driving end. The second locking member is a recessed portion formed by a recessed arrangement on the inner wall of the guide channel, and the recess has a stop surface for the abutting end to abut against, and the other end of the lock spring opposite to the end abutting against the movable lock member abuts against the buckle block or the inner wall of the guide channel.

10. The snap fastening unit according to claim 9, characterized in that: The release action part is a push arm on the movable lock, and the driving end part is pushed and matched with the push arm.

11. The snap fastening unit according to claim 5, wherein: The locking portion on the movable lock member is an abutting end portion located on the side of the rotation center of the movable lock member, the second locking member is a recessed portion formed by a recessed arrangement on the inner wall of the guide channel, the recessed portion has a stop surface for the abutting end portion to abut, and the abutting end portion abuts on the stop surface to form a first lock member and a second lock member to be locked, a sliding slot is provided on the movable lock member, and the sliding slot is located between the locking portion and the rotation center of the movable lock member, and a plug-in arm is provided on the trigger member, and the plug-in arm of the trigger member is slidably plugged into the sliding slot, so that the trigger member and the movable lock member slide relative to each other, and the plug-in arm of the trigger member is close to the sliding slot. One side wall of the movable locking piece is in contact with each other to form a linkage between the trigger piece and the movable locking piece in the rotation direction; when the head is inserted into the thin-walled through hole, the periphery of the through hole on the thin wall presses against the upper trigger surface, and the trigger piece presses against the wall of the sliding slot through the plug-in arm, thereby driving the movable locking piece to rotate until the abutting end part disengages from the stop surface, and a reset spring at the trigger end part is arranged between the trigger piece and the movable locking piece, and a guide wall is provided on the buckle block to limit the rotation of the trigger piece and guide the trigger piece to slide linearly. In the process of the head part disengaging from the thin-walled through hole, the lower avoidance driving surface is pressed against by the periphery of the thin-walled through hole, and the trigger piece slides linearly under the guide wall setting.

12. The snap fastening unit according to claim 2, characterized in that: The buckle block is provided with an assembly groove along the thickness direction, and a convex part surrounding the assembly groove is correspondingly formed on the buckle block, the clamping surface of the chuck extends to the convex part, and the first locking member and the triggering member are both arranged in the assembly groove.

13. The snap-fastening unit according to claim 1, characterized in that: The front end surface of the clamp has a flat end surface extending from a side close to the clamping surface to a side away from the clamping surface along the height direction of the buckle block.

14. The snap-fastening unit according to claim 13, wherein: A chamfered surface is provided on the head at an end corner corresponding to the guide channel port and away from the fastening support wall, under which the flat end surface portion can protrude through the chamfered surface to be exposed outside the guide channel port when the buckle block is in the loosened position.

15. The snap fastening unit according to claim 1, wherein: The buckle block is provided with a tool coupling portion that can be engaged by a tool to achieve the purpose of sliding the buckle block to a loosened position with the help of the tool. The head is provided with an operation window for exposing the tool coupling portion. The operation window is located on the side of the fastening support wall away from the clamping surface of the buckle block. The operation window can be covered by a detachable cover plate or directly opened on the head.

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