CN220522977U - Buckle fastening unit - Google Patents

Abstract

The utility model relates to a buckle fastening unit, which comprises a shell, at least one buckle block and an automatic locking device, wherein the shell is provided with a fastening supporting wall and a head part extending away from the fastening supporting wall, the buckle block is limited on a guide channel of the head part to directionally slide, the buckle block is provided with a chuck, the buckle block is provided with a fastening position and a loosening position on the head part, the buckle block is provided with an elastic element, the elastic element provides elastic loading force for driving the buckle block to slide to the fastening position and keep the fastening position, the automatic locking device comprises a first locking component and a second locking component, the first locking component and the second locking component are arranged on the buckle block to move along with the buckle block, and when the buckle block slides to the loosening position, the first locking component and the second locking component are automatically interlocked to lock the buckle block on the head part, and meanwhile, the elastic element completes energy storage; the automatic locking device also has a trigger member for driving the first locking member to unlock with the second locking member to release the locking block from the unlocking position. Has the function of retracting and keeping the buckle block, and is convenient to assemble, disassemble and operate.

Description

Buckle fastening unit

Technical Field

The utility model relates to the field of mechanical installation, in particular to a buckle fastening unit for equipment installation and fixation.

Background

Snap fastening is a cost-effective mechanical fastening solution that does not require screws, but simply requires a simple mounting hole in a thin wall that can be attached to, for example, a housing wall, door leaf, window shutter, frame, door frame or plate-like member, etc., and thus is widely used in a variety of applications; such as the connection of two or more elements with the above-mentioned thin walls together, or the connection of a latch, handle or other device to a frame with thin walls (for example the application to a lock disclosed in CN 217581643U).

A variety of structural forms of snap-fastening units are described in the related art, such as the simple structural form of one plastic part disclosed in US 6042296 patent document; or a mechanism made up of several parts as disclosed in the patent documents US 7600794B2, US 8001656B2, US 8297665B2, the snap fastening unit may be a separate element or may be part of an integrated device. The fastening unit of the multi-component mechanism generally comprises a shell, a fastening supporting wall is arranged on the shell and used for limiting and supporting a thin wall with a through hole, a seat shell (or called a head) protruding from the fastening supporting wall is arranged on the shell, a fastening block capable of sliding transversely is arranged in the seat shell, the fastening block is provided with a chuck, the chuck is matched with the fastening supporting wall to clamp on the thin wall, the fastening block is movable, and accordingly has a fastening position matched with the fastening supporting wall to clamp and fix on the thin wall and a loosening position withdrawn from the fastening position to loosen the thin wall along the sliding direction of the fastening supporting wall, detachment and separation of the fastening unit and the thin wall are achieved, the fastening block is held in the fastening position by means of a spring, the chuck of the fastening block is provided with an inclined surface, the inclined surface is arranged on one side of the fastening block, corresponding to the assembly direction of the thin wall (the direction of the seat shell protruding on the fastening supporting wall), the fastening block interacts with the periphery of the through hole on the thin wall during installation, the periphery of the through hole pushes the fastening block until the periphery of the fastening block reaches the vertex of the fastening block, namely the fastening block is retracted to the loosening position, and then the fastening block is matched with the fastening block at the lower end of the fastening position.

The existing multi-part combined type buckle fastening unit has the following defects: when no pressing force is applied to the buckling block, the buckling block is always kept at a convex fastening position under the driving force of a spring, and therefore, an inclined surface is needed on the buckling block, when the buckling fastening unit is buckled and fixed on the thin wall, the inclined surface provides a guide that the periphery of the through hole of the thin wall presses the buckling block to slide and abdicate, so that the force for driving the buckling block to keep buckling and fastening on the thin wall becomes resistance in the buckling assembly process, the assembly resistance accompanies the whole assembly process, and the resistance is continuously increased until the periphery of the through hole of the thin wall passes through the vertex of the buckling block, and when strong buckling maintaining force is needed, the buckling fastening unit cannot be inserted into a hole of the thin wall with low resistance; on the other hand, in occasional maintenance or disassembly, each time the snap fastening unit needs to be removed from the thin wall, it is necessary for the operator to maintain the snap blocks compressed inside the housing by means of a separate tool (the presence of the further inclined surface makes it difficult to press the snap blocks directly by the hand, and therefore it is also necessary to press the snap blocks by means of a tool), while the snap fastening unit is pulled out of the hole of the thin wall, making the disassembly operation inconvenient.

Disclosure of Invention

The utility model aims at: in order to overcome the defects in the prior art, the utility model provides the buckle fastening unit with the buckle block retraction and retention functions, and the buckle fastening unit has the advantages of rapidness and convenience in disassembly, low push-insertion resistance and the like.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a fastening unit for fastening on one or more thin walls with through holes, comprising a housing with a fastening support wall and a head extending away from the fastening support wall, with a guiding channel,

the clamping block is limited on the guide channel of the head to directionally slide, and is provided with a fastening position and a releasing position on the head, when in the fastening position, the clamping head of the clamping block protrudes out of the head and correspondingly cooperates with the fastening supporting wall to form a fastening state capable of being clamped and fixed on one or more thin walls, when in the releasing position, the clamping head of the clamping block is retracted into the head to form a detachable state that the head of the clamping fastening unit can freely enter and exit the thin wall through hole,

the snap block is provided with a resilient element providing a spring-loaded force urging the snap block to slide into and remain in the fastening position,

The method is characterized in that: the automatic locking device comprises a first locking component which is arranged on the locking block and moves along with the locking block, and a second locking component which is arranged on the head, when the locking block slides to the unlocking position, the first locking component and the second locking component are automatically locked to lock the locking block on the head, and meanwhile, the elastic element is used for storing energy; the automatic locking device is also provided with a triggering component for driving the first locking component and the second locking component to unlock so as to release the locking block from the releasing position, and the locking block released in the releasing position is driven by the energy storage capacity of the elastic element to reset to the fastening position.

By adopting the technical scheme, the automatic locking device is used for locking/unlocking the buckle block at the unlocking position on the head so as to keep and release the buckle block at the unlocking position, when the buckle block slides to the unlocking position, the automatic locking device automatically locks so as to finish the locking of the buckle block on the head so as to keep the buckle block at the unlocking position (namely, the buckle block is in a retraction state), so that the energy storage of the elastic element is achieved, the buckle block can be compressed to the unlocking position in advance during assembly and disassembly, and the buckle block can pass through the through hole of the thin wall without being compressed by the periphery of the through hole on the thin wall, so that the fastening installation and disassembly processes are smoother and more convenient; this also allows for a more flexible setting of the fastening force (spring element providing) parameters; when the buckle fastening unit is assembled on the thin wall, the head of the buckle fastening unit is inserted into the through hole of the thin wall and reaches a preset position relative to the thin wall, the trigger component drives the automatic locking device to release the buckle block, the chuck of the buckle block is ejected under the action of the energy storage capacity of the elastic element, and the buckle fastening unit is fastened on one or more thin walls.

Preferably, the trigger member is disposed on the buckle block and moves along with the buckle block, the trigger member includes a trigger piece movably disposed on the buckle block, and a trigger end return spring for driving the trigger piece to move and return, the trigger piece has a trigger end for operating the trigger member, the trigger end can be protruded and exposed on the front end surface of the chuck of the buckle block under the drive of the trigger end return spring, an upper trigger surface and a lower avoidance driving surface are disposed on the trigger end, 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 disposed along the direction of inserting the head into the thin-wall through hole, and in the process of inserting and withdrawing the head into and from the thin-wall through hole, the upper trigger surface and the lower trigger surface are directly contacted and pressed through the periphery of the thin-wall through hole so as to drive the trigger end to retract towards the rear of the front end surface of the chuck of the buckle block, and in the process of inserting the head into the thin-wall through hole, the upper trigger surface is directly contacted and pressed through the periphery of the thin-wall through hole so as to operate the trigger member to unlock the first lock member and the second lock member. Under the structural design, the triggering member is arranged on the buckling block, can be assembled into the shell along with the buckling block, is convenient for assembling a product, adopts the triggering end part capable of exposing the front end surface of the chuck of the buckling block, and in the process that the head part is inserted into the through hole on the thin wall, the periphery of the through hole of the thin wall triggers the upper triggering surface of the triggering end part, the triggering end part is compressed and retracted to the front end surface of the chuck of the buckling block, the periphery of the through hole of the thin wall passes through the vertex of the triggering end part, meanwhile, the buckling block is released, the buckling block moves to a fastening position through the energy storage capacity of the elastic element, the buckling fastening unit is fixed on the thin wall, and the operation is simpler; in the process that the head part exits from the through hole of the thin wall, the lower avoidance driving surface is used for pressing the periphery of the through hole of the thin wall, so that the trigger end part of the trigger member is avoided for the thin wall, the periphery of the through hole of the thin wall passes through the vertex of the trigger end part, and in the process that the buckle fastening unit is disassembled from the thin wall, the force required by triggering the trigger member is irrelevant to the force required by resetting the buckle block to the fastening position, and the trigger member is triggered by only needing smaller force.

Preferably, the first locking member comprises a movable locking piece movably arranged on the buckling block, the movable locking piece is matched with a locking piece spring, the locking piece spring provides a spring force for driving the movable locking piece to be in locking fit with the second locking member, and the movable locking piece is driven to act through operating the triggering member, so that unlocking with the second locking member is completed. Under the structural design, the first locking component arranged on the buckling block adopts movable arrangement and is matched with the triggering component to unlock the automatic locking device, the matching is more reliable and convenient,

correspondingly, the second locking member is a convex part or a concave part formed on the inner wall of the guide channel of the head part. The second lock component can adopt a fixed structure which is directly formed on the shell, and has simple structure and convenient processing.

Preferably, the movable locking piece is rotatably arranged on the buckling block, and the buckling part on the movable locking piece deflects the rotation center of the movable locking piece. Under the structural design, the movable lock piece rotates, the required assembly space is small, and the action is more flexible and reliable.

Preferably, the locking part is a hook-shaped hook head, and the second locking member is a hook structure for hooking the hook head. Under the structural design, the locking of the automatic locking device is more stable and reliable.

Preferably, the trigger piece is a lever arm fixed on the movable lock piece or integrally formed on the movable lock piece, the lever arm and the movable lock piece form a lever structure with a pivot point located between the lever arm and the hook head, the lock piece spring is used as a trigger end return spring for driving the lever arm to a non-trigger state, and the lower avoidance driving surface is a convex arc-shaped curved surface. Under the structural design, the trigger component and the movable locking piece form a single accessory which synchronously acts to form a lever structure, the structure is simple and compact, the lower avoidance driving surface is a convex arc-shaped curved surface, and the trigger end part can be pushed by a thin wall to drive the lever arm to swing.

Preferably, the locking piece spring is a compression coil spring, one end of the compression coil spring is propped against the buckling block, the other end of the compression coil spring is propped against the lever arm, the lever arm is in a hook shape, and the compression coil spring is correspondingly arranged in a hook opening of the lever arm. Under the structural design, the installation and arrangement of the lock piece spring are convenient and reliable.

Preferably, the buckle block is concavely provided with an assembly groove along the thickness direction, a corresponding convex part surrounding the assembly groove is formed on the buckle block, the clamping surface of the clamping head extends to the convex part, and the first lock component and the triggering component are uniformly distributed in the assembly groove. Under this structural design, first lock component and trigger component equipartition need not additionally to reserve the space in the guide way of casing in the assembly recess, and overall structure is compact, and processing and equipment are convenient, and the location of buckle piece slides more reliable and more stable, guarantees the grip face width size on the buckle piece in addition.

Preferably, the front end surface of the chuck is provided with a flat end surface extending from the side close to the clamping surface to the side far from the clamping surface along the height direction of the clamping block. Under this structural design, the flat terminal surface is convenient for hold in the palm the buckle piece, directly compresses the buckle piece to the guide channel in, has convenient operation's advantage.

Preferably, the end corner of the head part corresponding to the guide channel port and far away from the fastening support wall is provided with a chamfer surface, and under the chamfer surface, the part of the flat end surface can be exposed out of the guide channel port through the chamfer surface in a protruding way when the clamping block is positioned at the loosening position. Under this structural design, be convenient for keep away from the one end of clamping face with buckle piece compression in place.

Preferably, a single guide channel is arranged on the head, two buckling blocks oppositely arranged in the opposite direction are arranged in the single guide channel, each buckling block is provided with an elastic element, the two buckling blocks are stacked and arranged in the guide channel along the thickness direction, waist-shaped holes matched with the sliding stroke of the buckling blocks are formed in the buckling blocks, a limiting pin is fixed on the head, and the limiting pin penetrates through the waist-shaped holes of the buckling blocks so as to limit the buckling blocks to directionally slide on the head. Under this structural design, adopt the design of two buckle piece, and the arrangement structure of two buckle piece is compact.

Preferably, the fastening block is provided with a tool combining part for enabling the tool to be combined to finish pulling the fastening block to slide to the loosening position by means of the tool, the head is provided with an operation window for exposing the tool combining part, the operation window is positioned on one side of the fastening support wall, which is away from the clamping surface of the fastening block, and the operation window can be sealed by a detachable cover plate or is directly opened and arranged on the head. Under this structural design, in some applications, when the protruding end of head can not be directly close, the buckle piece can be compressed by the instrument from the opposite side of head to accomplish to remove the buckle piece and loosen the position and lock, afterwards can conveniently take buckle fastening unit out from thin-walled through-hole.

The utility model is further described below with reference to the accompanying drawings.

Drawings

FIG. 1a is a view showing an unfolded state of a buckle fastening unit (a buckle block is in a fastening position) according to an embodiment of the present utility model;

FIG. 1b is an E-view according to FIG. 1 a;

FIG. 1c is a cross-sectional view taken along section line A-A of FIG. 1 b;

FIG. 2a is a view showing a retracted state (the latch block is in the released position) of the latch fastening unit according to the embodiment of the present utility model;

FIG. 2b is an F-direction view according to FIG. 2 a;

FIG. 2c is a cross-sectional view taken along section line B-B of FIG. 2B;

FIG. 3 is an exploded view of a buckle fastening unit according to an embodiment of the present utility model;

fig. 4a to fig. 4c are schematic views illustrating a fastening process performed by a fastening unit and a thin wall according to an embodiment of the present utility model;

FIGS. 5 a-5 f are schematic views illustrating a process of disengaging the snap fastening unit from the thin wall according to an embodiment of the present utility model;

FIG. 6 is a schematic view of another snap-fastening unit which can be disassembled by means of a tool according to the present utility model;

FIG. 7 is a schematic view of another snap-fastening unit which can be disassembled by means of a tool according to the present utility model;

fig. 8a is a view showing a retracted state (the latch block is in the released position) of the latch fastening unit according to the fourth embodiment of the present utility model;

fig. 8b is a view showing a trigger state of the buckle fastening unit according to the fourth embodiment of the present utility model;

fig. 8c is a view showing a buckle fastening unit in an unfolded state (buckle block in fastening position) according to the fourth embodiment of the present utility model;

FIG. 8d is an exploded view of a buckle fastening unit according to a fourth embodiment of the present utility model;

fig. 9a is a view showing a retracted state (the latch block is in the released position) of the latch fastening unit according to the fifth embodiment of the present utility model;

fig. 9b is a view showing a trigger state of the buckle fastening unit according to the fifth embodiment of the present utility model;

Fig. 9c is a view showing a buckle fastening unit in an unfolded state (buckle block in fastening position) according to a fifth embodiment of the present utility model;

fig. 10a is a view showing a retracted state (the latch block is in the released position) of the latch fastening unit according to the sixth embodiment of the present utility model;

fig. 10b is a view showing a trigger state of the buckle fastening unit according to the sixth embodiment of the present utility model;

fig. 10c is a view showing a buckle fastening unit in an unfolded state (buckle block in fastening position) according to a sixth embodiment of the present utility model;

fig. 10d is a schematic view of the buckle fastening unit according to the sixth embodiment of the present utility model in a disassembled state;

fig. 11 is a schematic structural diagram of another embodiment according to the fifth adjustment of the present utility model.

Detailed Description

Example 1

Referring to fig. 1a to 5f, a fastening unit for fastening a fastener to one or more thin walls with through holes (it should be noted that a plurality means two or more, and the same applies to the "thin walls" appearing below), the fastening unit may be an independent component for connecting two (refer to fig. 4a to 5 f) or more thin walls 1-1 with through holes together (refer to fig. 6); the snap fastening unit may also be integrated into a larger unit as part of a larger unit (e.g., latch, hinge, handle, door, etc.) to assist in securing such large items to the frame through-holes (e.g., clip-on openings, snap-in holes) carried on the thin wall of the frame; the clip fastening unit comprises a housing 1 and at least one clip block 2, the housing 1 is in the application of the clip fastening unit, the housing 1 is not only in the form of a separate housing as shown in the prior art, but also can be changed into a part of other devices (such as handles, doors, hinges, etc.), the housing 1 is provided with a fastening support wall 11 and a head 12 extending away from the fastening support wall 11, the head 12 is provided with a guide channel 121, the clip block 2 is limited on the guide channel 121 of the head 12, the clip block 2 is provided with a clip 21 for pressing the thin wall 1-1 onto the fastening support wall 11 to realize the clip fastening on the thin wall 1-1, the clip block 2 is provided with a fastening position (such as fig. 1 a-1 c and fig. 4 c) and a releasing position (such as fig. 2 a-2 c and fig. 4a, 5 c), the clip block 2 is in the fastening position, the clip block 21 extends out of the mouth of the guide channel 121 and is correspondingly matched with the fastening support wall 11 to be fixed on one or more thin walls 1-1, i.e. the clip block 2 can be mounted in the clip element 3 in the elastic element, the clip element can be mounted in the elastic element 3 in the compression element, the elastic element can be mounted in the compression element 3, the elastic element can be mounted in the elastic element in the compression element 3, and the elastic element can be mounted in the elastic element in the compression element, the elastic element can be mounted state, the elastic element can be mounted in the elastic element is in the compression element 3, in order to improve the defects of the existing buckle fastening unit, the buckle fastening unit is provided with an automatic locking device, and the automatic locking device is used for locking a buckle block sliding to a loosening position to enable the buckle fastening unit to be kept in a loosening state (namely, the buckle block is contracted into a shell state), so that when the head of the buckle fastening unit is inserted into a thin-wall through hole for fastening assembly, the buckle block 2 is not required to be pushed to retract, and the dismounting operation of the buckle fastening unit avoids the elastic loading force of an elastic element. Specific: the automatic locking device comprises a first locking member 41 arranged on the locking block 2 and moving along with the locking block 2, and a second locking member 42 arranged on the head 12, when the locking block 2 slides to the unlocking position, the first locking member 41 and the second locking member 42 are automatically locked to lock the locking block 2 on the head 12, and meanwhile, the elastic element 3 completes energy storage; the automatic locking device also has a triggering member for driving the first locking member 41 and the second locking member 42 to unlock so as to release the locking block 2 from the releasing position, in which the released locking block 2 is driven to return to the fastening position by the energy storage capacity of the elastic element 3.

The automatic locking device automatically interlocks to complete locking of the buckle block on the head and keep the buckle block at the loosening position and achieve energy storage of the elastic element, so that the buckle fastening unit forms a mechanism with locking function and capable of storing energy internally, when the buckle block is assembled and disassembled, the buckle block can be compressed to the loosening position in advance, the first locking component 41 and the second locking component are driven to be unlocked by the triggering component to release the buckle block, the buckle block moves under the action of the energy storage of the elastic element until the chuck 21 is ejected, the chuck 21 of the buckle block stretches out to the fastening position, the buckle fastening unit is fixed on the thin wall, the buckle block is controllable, the resistance force for forcing the buckle block to retract to the loosening position is not required in the thin wall installation process, all the thrust force required for assembling the buckle fastening unit on the thin wall is obviously reduced or eliminated, the fastening installation process is smoother and more convenient, and when the buckle block is disassembled in the same way, the buckle block is compressed to be kept at the loosening position, the buckle block is not required to be manually kept at the loosening position, and the operation of the fastening unit is greatly convenient to disassemble; again, this allows for a more flexible setting of the parameters of the fastening force (provided by the elastic element 3).

In order to make the fastening process of the buckle more convenient, when the buckle block 2 is locked at the unlocking position, the triggering end part on the triggering member protrudes from the head 12, and the triggering end part is exposed at the periphery of the through hole of the thin wall 1-1 in the process of inserting the buckle fastening unit into the through hole of the thin wall 1-1 along the head 12, so that the thin wall 1-1 directly applies contact pressure to the triggering end part of the triggering member in the process of pushing and inserting the head into the through hole of the thin wall to finish the triggering operation of unlocking the automatic locking device, and the fastening installation process of the buckle is smoother; although actuation of the trigger member through the thin wall 1-1 is resisted by the trigger member, and the snap-in block is pressed against the periphery of the hole of the thin wall before the trigger operation reaches the fastening position fastened to the thin wall 1-1, the remaining stroke of the thin wall 1-1 into the fastened position may be of a shorter design, and the front side 21a of the collet 21 adopts a flat surface, so that the remaining stroke of the snap-in block into the thin wall through hole is easier even if the released snap-in block is pressed against the periphery of the thin wall through hole with a larger contact pressure.

Also, as an alternative embodiment, it is possible to design the triggering member independently of the direct contact triggering of the periphery of the thin wall, i.e. after the head of the snap fastening unit has been fully inserted into the through hole of the thin wall, the triggering member can be triggered manually by an auxiliary actuator, such as a squeeze button, a pull wire or by a magnetic field signal, under the guidance of the present utility model, as a person skilled in the art in light of the present utility model.

The trigger member is configured on the buckle block 2 and moves along with the buckle block 2, the trigger member is associated on the buckle block, the trigger member can be associated with the buckle block into a module form, so that the assembly operation of a product is facilitated, the trigger member comprises a trigger piece 43 movably configured on the buckle block 2 and a trigger end return spring 44 for driving the trigger piece 43 to move and reset, the trigger piece 43 is provided with a trigger end for operating the trigger member, the trigger piece 43 is driven by the trigger end return spring 44, the trigger end protrudes out of the front end face 21a of the chuck 21 of the buckle block 2, the position of the front end face 21a of the chuck 21 of the trigger end protruding out of the buckle block 2 is limited by a stop limiting structure (such as one wall 1210 in the specific embodiment), an upper trigger face 431 and a lower avoidance driving face 432 are arranged on the trigger end, a vertex Q is naturally formed at the joint of the upper trigger face 431 and the lower avoidance driving face 432, the upper trigger face 431 and the lower avoidance driving face 432 are arranged along the direction of a through hole of the head 21 for inserting the thin wall 1-1, the upper trigger face 431 and the lower avoidance driving face 432 are protruded out of the chuck 21 and are pressed against the periphery of the thin wall 1 through the first through the periphery of the thin wall 1-1 of the trigger block 1, the trigger end face 1 is pressed against the first through the thin wall face 1 and the periphery of the trigger member 1-1, the thin wall face is pressed against the thin wall 1 is pressed against the periphery of the thin wall 1 through the trigger end face 1, and the thin wall 1 is pressed against the thin wall 1, and the periphery of the trigger member is pressed against the thin wall 1, and the thin wall 1 is contacted with the thin wall 1. When the buckle fastening unit is assembled, the head is inserted along the thin-wall through hole, when the head is inserted into a certain position, the upper trigger surface 431 contacts the periphery of the thin-wall through hole, the head is continuously pushed into the thin-wall through hole, the periphery of the thin-wall through hole presses the upper trigger surface 431, so that the trigger member acts, the trigger end part retracts to the rear of the front end face of the chuck of the buckle block until the periphery of the thin-wall through hole reaches the vertex position, the trigger end part avoids the periphery of the thin-wall through hole, meanwhile, the first lock member and the second lock member are unlocked, the buckle block is released, the head is inserted into the position, and the buckle block moves to the fastening position, so that the buckle fastening unit is fastened on the thin wall (see fig. 4 a-4 c); when the head is separated from the thin-wall through hole to a certain position during the disassembly operation, the lower avoidance driving surface 432 contacts the periphery of the thin-wall through hole, the head is continuously pulled out of the thin-wall through hole, the avoidance driving surface is pressed down by the top of the periphery of the thin-wall through hole, so that the trigger member acts to avoid until the periphery of the thin-wall through hole reaches the top position, and the head is completely pulled out of the thin-wall through hole, (as shown in fig. 5 a-5 f); under the guidance of the present utility model, the person skilled in the art can also configure the triggering member on the housing, but this requires that the triggering member and the fastening block are assembled on the housing separately, and a structure for installing the triggering member is reserved on the housing, which causes inconvenience in processing, assembly and structural design. An assembly groove 22 is concavely formed on the buckling block 2 along the thickness direction, a convex part 23 surrounding the assembly groove 22 is correspondingly formed on the buckling block 2, a clamping surface 211 of the clamping head 21 extends to the convex part 23, and the first locking member 41 and the triggering member are uniformly arranged in the assembly groove 22. The first locking member and the triggering member are uniformly distributed in the assembly groove 22, no additional reserved space is needed in the guide channel 121 of the shell, the whole structure is compact, the processing and the assembly are convenient, the positioning sliding of the clamping block is more stable and reliable, and the width dimension of the clamping surface 211 on the clamping block is ensured.

In this embodiment, the first lock member 41 includes a movable lock 411 rotatably disposed on the latch 2, the movable lock 411 is mounted on the latch 2 via a pivot 413, a locking portion 4111 on the movable lock 411 is offset from a rotation center of the movable lock 411, the locking portion 4111 can swing around the pivot of the movable lock 411, the locking portion 4111 is a hook-shaped hook, the movable lock 411 is matched with a lock spring 412, the lock spring 412 provides a spring force for driving the movable lock 411 to be in locking engagement with the second lock member 42, and the trigger member is operated to a trigger state to drive the movable lock 411 to act, thereby unlocking the second lock member 42. In the design of the above-mentioned fitting groove 22 on the snap-in block 2, the second lock member 42 is a protrusion formed on the inner wall of the guide channel 121 of the head 21. The protruding portion is inserted into the fitting groove 22 to achieve a compact fit. Of course, in the present utility model, the second locking member 42 is a recess formed on the inner wall of the guide channel 121 of the head 21 to adapt to different structures and mating forms of the movable locking member 411, for example, the second locking member 42 may be a recess formed on the inner wall of the guide channel 121 of the head 21 when the locking block is not provided with a fitting groove and the head is provided with a recess. The movable lock 411 is driven by the lock spring 412 to automatically hang the hook head (the locking portion 4111) into the second lock member 42 when the locking block 2 slides to the releasing position, the lock spring 412 can be a compression spring or a tension spring or a torsion spring, preferably adopts a compression spring design, and the movable lock 411 is driven by the trigger 43 to swing against the force of the lock spring 412 so that the hook head (the locking portion 4111) of the movable lock 411 is separated from the protruding portion (the second lock member 42). The hook head tends to buckle to the convex part under the drive of the lock piece spring 412, thus when the buckle block slides to the release position, the movable lock piece 411 automatically hangs into the convex part under the action of the force of the lock piece spring 412 to realize self-locking, the automatic locking process is specifically that when the buckle block 2 is about to slide to the release position, the hook head reaches the convex part position, the hook head (the locking part 4111) is lifted and jumped through the convex part pushing, and slides to the release position at the buckle block 2, the hook head (the locking part 4111) automatically hangs into the convex part to complete the locking hook under the drive of the lock piece spring 412, the triggering member is pushed, the hook head (the locking part 4111) swings out of the convex part to release the buckle block under the action of the energy storage spring force, the automatic locking device adopts the movable lock piece 411 which rotates to complete locking on the convex part (as shown in fig. 5b to 5 c), when the hook head (the locking part 4111) contacts with the convex part, the hook head (the locking part 4111) can be pushed by the convex part, the hook head (the locking part) has a slope, and the hook head (the hook part 4111) has an arc-shaped outline easily thought. The movable lock 411 has the advantages of sensitive and reliable action, and is locked by adopting a hook-head hooking mode, so that the operation is reliable. When the fastening block does not enter the releasing position, the hook head (the locking portion 4111) supports the hook head through the wall in the assembly groove to achieve limiting (the limiting is used for keeping the position of the hook head, and the structural form can also be a rotating angle limiting structure of other rotating pieces), so that the hook head can be hooked on the protruding portion.

Of course, those skilled in the art can select corresponding alternatives in the existing locking structure, such as the form of the first and second lock members 42 and the form of the sliding bolt mating with the locking aperture, under the guidance of the present utility model. In addition, it is easily conceivable to those skilled in the art that the structural forms of the first lock member and the second lock member 42 may be interchanged, and as provided in this embodiment, the first lock member is a movable lock 411 with a hook head (a locking portion 4111), and the second lock member is a protrusion, and it is also possible to adjust the scheme that the first lock member is a protrusion or a recess, the protrusion or the recess is provided on the locking block, and the second lock member 42 includes a movable lock 411 with a hook head (a locking portion 4111), and the movable lock is mounted on the head. However, the structural design in which the first lock member 41 is arranged on the catching block 2 by using a movable lock member which is movable and the trigger member and the first lock member are arranged on the catching block 2 can facilitate the assembling operation of the catching fastening unit, while in view of the generally flat shape of the catching block, the arrangement in which the lock hook member is arranged to be rotatable about an axis in the thickness direction (X-axis direction in the drawing) of the catching block is adopted; i.e. the axial direction of the pivot shaft of the movable lock 411 is arranged in the thickness direction of the catch block.

Further, the trigger member 43 is designed as a single component that moves synchronously with the movable locking member, rather than being independent of the structure of the movable locking member, specifically: the trigger member 43 is a lever arm fixed or integrally formed on the movable lock member 411, the lever arm (trigger member 43) and the movable lock member 411 form a lever structure with a pivot point located between the lever arm (trigger member 43) and the hook head (locking portion 4111), the lock member spring 412 is simultaneously used as a trigger end return spring 44 for driving the lever arm to a non-trigger state, the lower avoidance driving surface 432 is a convex curved surface, and according to the lever principle, a person skilled in the art can obtain the curvature of the required convex curved surface and the distance parameter of the pivot point from the convex curved surface through parameter calculation and in limited experiments.

In order to facilitate 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 buckle block 2, the other end of the compression coil spring abuts against the trigger piece 43, the trigger piece 43 is in a hook shape, and the compression coil spring is correspondingly arranged in a hook opening of the trigger piece 43. Of course, the lock spring 412 may also be a torsion spring, as will be readily appreciated by those skilled in the art. In addition, one end of the compression coil spring can be abutted against one wall of the guide channel, and the corresponding wall is required to be formed in the guide channel, so that the structure is more complicated.

Because the buckle block does not have thin wall pressing to realize the requirement of pressing to the releasing position, the inclined surface special for thin wall pressing on the traditional buckle block is not needed any more, and thus in this embodiment, the front end surface of the chuck 21 is provided with a flat end surface 212 extending from the side close to the clamping surface 211 to the side far from the clamping surface 211 along the height direction of the buckle block. Compared with the prior buckle fastening unit, the flat end face is more beneficial to holding the buckle block by hand under the design that the buckle block is an inclined plane, and provides the operation possibility and convenience for directly compressing the buckle block into the guide channel for the buckle fastening unit in some application occasions.

Further, the end of the head 12 corresponding to the guide channel 121, which is far from the fastening support wall 11, is provided with a chamfer 122, and under the chamfer 122, the part of the flat end 212 of the latch 2 is exposed outside the head 12 (as shown in fig. 2 a) through the chamfer 122. Thus, even if the clip is in the released position, portions of the collet 21 may be exposed through the chamfered surface to the guide channel port, facilitating compression of the clip into place.

For convenient compact installation and simple to operate of buckle piece, be equipped with two buckle piece 2 that the orientation was opposite to arranging in single guide channel 121, two buckle piece 2 stacks along thickness direction and arranges in guide channel, and each buckle piece 2 is furnished with an elastic element 3, is equipped with the waist shape hole with buckle piece 2 sliding travel adaptation on buckle piece 2, is fixed with spacer pin 13 on head 12, and spacer pin 13 passes buckle piece's waist shape hole thereby realizes restricting buckle piece 2 on head 12. Has the advantage of compact structure. Of course, the person skilled in the art, in combination with the prior art, could also use a single catch block 2 arrangement according to the utility model.

In some applications, as shown in fig. 6 and 7, when the protrusion of the head cannot directly reach the extended end of the protrusion of the head, such as the thin-walled hole is a blind hole, and the head is inserted into the blind hole, so that the fastener block can still be compressed to the release position, the technical solutions of the second embodiment and the third embodiment can be well applied, a tool combining portion 24 for enabling the tool to be engaged to complete sliding of the fastener block 2 to the release position by means of the tool is provided on the fastener block 2, the tool combining portion 24 can be a notch or a protrusion, and an operation window 123 for exposing the tool combining portion 24 is provided on the head 12, and the operation window 123 is located on one side of the fastening support wall 11 facing away from the clamping surface 211 of the fastener block 2, that is, on the side facing the opposite direction of the protrusion of the head, and the fastener block can be compressed by means of the tool, and the operation window 123 can be capped by the detachable cover plate 14 (as shown in fig. 6) or directly opened and arranged on the head 12 (as shown in fig. 7).

Example IV

As shown in fig. 8a to 8d, the main difference between the buckle fastening unit provided in this embodiment and the first embodiment is that the trigger member, the first lock member and the second lock member 42 have different structural forms, and those skilled in the art can know the content of the corresponding parts by combining the description of the first embodiment with the drawings, so that for simplicity in explaining the scheme of this embodiment, the same parts of this embodiment as those of the first embodiment will not be described again.

In this embodiment, the triggering member is also configured on the fastening block, the first latch hook is also designed by adopting a rotating movable lock piece, and an assembly groove for assembling the triggering member and the first latch hook is also designed on the fastening block; the difference is that: the trigger piece 43 is a sliding piece slidably disposed on the fastening block 2, the sliding direction of the trigger piece 43 is consistent with the sliding direction of the fastening block 2, one end of the trigger piece 43 has a trigger end, the other end of the trigger piece has a driving end 433, the locking portion 4111 on the movable lock piece 411 is an abutting end on the movable lock piece 411, the movable lock piece 411 is provided with a trip acting portion 4112 in driving connection with the driving end 433, the trip acting portion 4112 is a pushing arm on the movable lock piece 411, the driving end is in pushing fit with the pushing arm, the trigger end reset spring 44 is a coil spring abutting against the trigger piece 43, and naturally, since the trigger piece 43 and the movable lock piece 411 are linked, the function of the trigger end reset spring can be realized through the lock piece spring 412, that is, the lock piece spring 412 can be simultaneously used as the trigger end reset spring, the specially designed trigger end reset spring (as another variant provided in fig. 11 of this embodiment) is omitted, but the existence of the specially designed trigger end reset spring 44 can better push the trigger piece to a determined position, prevent the trigger piece from jumping, and reduce the noise, and the second lock piece is provided with a concave recess portion 421 to form an abutting against the concave portion 121. The upper trigger surface 431 and the lower back-out driving surface 432 are both beveled for thin wall touch. When the buckling block 2 slides to the releasing position, the locking part 4111 falls into the concave part under the drive of the lock piece spring 412, and the locking part abuts against the stop surface 421 under the drive of the elastic element to lock the buckling block 2 at the releasing position; when the triggering member performs triggering operation, the periphery of the thin-wall through hole pushes the upper triggering surface 431 or the lower avoidance driving surface 432, the triggering piece slides and pushes the movable locking piece 411 to rotate, the locking part 4111 of the movable locking piece swings out of the stop surface 421, unlocking of the automatic locking device is achieved, the locking block 2 is released, and the locking block 2 is reset to the fastening position under the energy storage capacity of the elastic element. Wherein, the other end of the lock spring 412 opposite to the abutting end of the movable lock 411 can be abutted to the buckle block, and the lock spring accommodating part of the assembly groove is provided with a cut-off spring supporting wall; or as shown in fig. 11, the lock spring accommodating part of the assembling groove adopts an opening from which one end of the lock spring extends, and the end of the lock spring is abutted on the wall of the guide channel, so that the design has the advantages that: in the initial stage of assembling the lock spring, the lock spring does not need to be purposely compressed, and then the operation of assembling the buckling block into the shell is performed, the lock spring also does not provide spring force for the movable lock 411, and the movable lock 411 does not need to be purposely pressed, so that the assembling operation is more convenient.

Wherein, a disengagement stopping protrusion 1211 for stopping the abutting end is provided in the guiding channel 121, the abutting end enters the corresponding position of the disengagement stopping protrusion 1211 under the driving of the lock spring 412, so as to avoid the blocking block 2 from being disengaged from the guiding channel under the action of the elastic element, and when the blocking block is assembled and disassembled as shown in fig. 9 a-9 c, the utility model also provides a scheme block of the fifth embodiment, the abutting end of the movable lock can be pressed, so that the abutting end can pass over the disengagement stopping protrusion 1211. Thus, the present embodiment does not require additional fittings to retain the snap block 2 within the housing 1, as compared to the designs of embodiments one through three, as well as the designs of the prior art.

Example five

The main difference between the technical solution of the present embodiment and the technical solution of the fourth embodiment is that the transmission connection structure of the trigger piece and the movable lock piece is different, in this embodiment, the trip action portion 4112 on the movable lock piece 411, which is in transmission connection with the driving end 433, adopts a gear face design, the driving end 433 on the trigger piece is a rack with meshed gear face, and because the trigger piece 43 and the movable lock piece 411 are in tooth transmission, under the transmission connection, the design of a single spring can be used for resetting and driving the trigger piece 43 and the movable lock piece 411 at the same time.

Example six

As shown in fig. 10a to 10c, the main difference between the buckle fastening unit provided in this embodiment and the first embodiment is that the trigger member, the first lock member and the second lock member 42 have different structural forms, and those skilled in the art can know the content of the corresponding parts by combining the description of the first embodiment with the drawings, so that for convenience in explaining the scheme of this embodiment briefly, the same parts of this embodiment and the first embodiment will not be described again.

In this embodiment, the triggering member is also configured on the fastening block 2, the first latch hook is also designed by adopting a rotating movable lock piece, and an assembly groove for assembling the triggering member and the first latch hook is also designed on the fastening block 2; the difference is that: the locking portion 4111 on the movable lock 411 is an abutting end portion located at a side of a rotation center of the movable lock 411 (such as a position where the central rotating shaft 413 is located in the drawing), the second lock member 42 is a concave portion formed by concavely forming an inner wall of the guide channel 121, the concave portion has a stop surface 421 for abutting against the abutting end portion, the movable lock 411 is provided with a sliding slot 4113, the sliding slot 4113 is located between the locking portion 4111 and the rotation center of the movable lock 411 (such as a position where the central rotating shaft 413 is located in the drawing), the trigger 43 is provided with an inserting arm 434, the inserting arm 434 of the trigger 43 is slidably inserted into the sliding slot 4113, so as to form a sliding fit between the trigger 43 and the movable lock 411, and the inserting arm 434 of the trigger 43 and a side wall 41131 of the sliding slot 4113 close to the movable lock 411 abut against each other, so as to form a linkage between the trigger 43 and the movable lock 411 in a rotation direction; 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 upper trigger surface 431, the trigger piece 43 can press against the wall of the sliding slot 4113 through the plug arm 434, so as to drive the movable lock piece 411 to rotate until the abutting end part is separated from the stop surface 421, and the release of the buckle block 2 is completed (as shown in figures 10 a-10 c); when the movable lock 411 is driven by the lock spring 412 to rotate and reset, the wall of the sliding slot 4113 of the movable lock 411 pushes the plugging arm 434 to drive the movable lock 411 to rotate and reset the trigger 43, the trigger end return spring 44 is arranged between the trigger 43 and the movable lock 411, namely, one end of the trigger end return spring 44 is abutted to the trigger 43, the other end of the trigger end return spring 44 is abutted to the movable lock 411, the buckle block 2 is provided with a guide wall 221 for limiting the rotation of the trigger 43 and guiding the trigger 43 to slide linearly, and under the design of the assembly groove 22, the guide wall 221 is a part of the wall of the assembly groove 22, so that the molding is more convenient; as shown in fig. 10d, when the guide wall 221 is provided, and the head 12 is separated from the through hole of the thin wall 1-1, the lower avoidance driving surface 432 is pressed by the periphery of the through hole of the thin wall 1-1, the trigger piece 43 can only slide, the trigger end of the trigger piece 43 retracts to the rear of the front end face of the chuck 21 of the fastening block 2, the movable lock piece 411 cannot be driven to rotate, that is, only the sliding avoidance of the trigger piece 43 occurs, and the first lock member and the second lock member keep the locking state; after the buckle fastening unit is disassembled, the buckle fastening unit can still be in a locking state of the buckle block, so that the next installation operation is convenient; the upper trigger surface 431 and the lower back-out driving surface 432 are both beveled for thin wall touch. When the buckle block slides to the releasing position, the locking part 4111 falls into the concave part under the drive of the lock piece spring, and the locking part props against the stop surface 421 under the drive of the elastic element to lock the buckle block at the releasing position; when the triggering member performs triggering operation, the periphery of the thin-wall through hole pushes the upper triggering surface 431, the triggering member slides, the plugging arm 434 pushes the movable locking member to rotate, the locking part 4111 of the movable locking member swings to be separated from the stopping surface 421, unlocking of the automatic locking device is achieved, the locking block is released, and the locking block is reset to the fastening position under the energy storage capacity of the elastic element.

Wherein, the guide channel 121 is provided with a disengagement preventing protrusion 1211 for stopping the abutting end, the abutting end enters a corresponding position of the disengagement preventing protrusion 1211 under the driving of the lock spring 412, so that the locking block is prevented from being disengaged from the guide channel under the action of the elastic element, and the abutting end of the movable lock can be propped against when the locking block is disassembled, so that the abutting end can pass over the disengagement preventing protrusion 1211.

The buckle fastener provided by the utility model has the following advantages: 1) The buckling blocks can be locked at the unlocking positions, so that when the buckling fastening units are disassembled and assembled, the buckling blocks are locked in advance, and the buckling blocks of the buckling fastening units are in a retracted state, so that the assembly and the disassembly are convenient; although the triggering member of the automatic locking device can form a certain blocking to the thin wall (the triggering member needs to be pressed by the periphery of the through hole of the thin wall to unlock the automatic locking device), the resistance is different from the fastening loading force of the fastener of the fastening unit, and the triggering force required by the automatic locking device is smaller; 2) The first lock component of the automatic locking device is a movable component, and the first lock component and a component (trigger component) for applying actions to the first lock component are arranged on the locking block, so that integrated assembly is realized, and then the first lock component is assembled on the head, and the automatic locking device has the advantage of convenient assembly operation; the assembled structural form is a waist-shaped hole and a transverse pin on the channel combined buckle block or a release-stopping bulge in the channel, and the assembling operation is simple and convenient. 3) Because the buckle block can be locked in the loosening position in advance, the design of the upper inclined plane of the traditional buckle block can be eliminated, the design of the flat end face can be adopted, and an operator can more easily and conveniently directly hold the buckle block to complete the retraction operation of the buckle block. This also further facilitates the ease of use of the snap fastener in some situations.

Claims (15)

1. A snap fastening unit for snap fastening to one or more thin walls with through holes comprises a housing with a fastening support wall and a head extending away from the fastening support wall, with a guide channel on the head,

the clamping block is limited on the guide channel of the head to directionally slide, and is provided with a fastening position and a releasing position on the head, when in the fastening position, the clamping head of the clamping block protrudes out of the head and correspondingly cooperates with the fastening supporting wall to form a fastening state capable of being clamped and fixed on one or more thin walls, when in the releasing position, the clamping head of the clamping block is retracted into the head to form a detachable state that the head of the clamping fastening unit can freely enter and exit the thin wall through hole,

the snap block is provided with a resilient element providing a spring-loaded force urging the snap block to slide into and remain in the fastening position,

the method is characterized in that: the automatic locking device comprises a first locking component which is arranged on the locking block and moves along with the locking block, and a second locking component which is arranged on the head, when the locking block slides to the unlocking position, the first locking component and the second locking component are automatically locked to lock the locking block on the head, and meanwhile, the elastic element is used for storing energy; the automatic locking device is also provided with a triggering component for driving the first locking component and the second locking component to unlock so as to release the locking block from the releasing position, and the locking block released in the releasing position is driven by the energy storage capacity of the elastic element to reset to the fastening position.

2. The snap fastening unit according to claim 1, wherein: the trigger component is configured on the buckle block and moves along with the buckle block, the trigger component comprises a trigger piece movably configured on the buckle block and a trigger end return spring for driving the trigger piece to move and reset, the trigger piece is provided with a trigger end for operating the trigger component, the trigger end can be protruded and exposed on the front end face of a chuck of the buckle block under the drive of the trigger end return spring, an upper trigger surface and a lower avoidance driving surface are arranged on the trigger end, 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 that the head is inserted into a thin-wall through hole, the upper trigger surface and the lower trigger surface are directly contacted and pressed through the periphery of the thin-wall through hole in the process that the head is inserted into and withdrawn from the thin-wall through hole so as to drive the trigger end to retract towards the rear of the front end face of the chuck of the buckle block, and the upper trigger surface is directly contacted and pressed through the periphery of the thin-wall through hole in the process that the head is inserted into the thin-wall through hole in order to operate the trigger component to unlock the first lock component and the second lock component.

3. The snap fastening unit according to claim 2, wherein: the first lock component comprises a movable lock piece movably arranged on the buckling block, a lock piece spring is matched with the movable lock piece, the lock piece spring provides spring force for driving the movable lock piece to be in locking fit with the second lock component, and the movable lock piece is driven to act through the operation triggering component, so that unlocking with the second lock component is completed.

4. A clasp fastening unit according to claim 3, wherein: the second lock member is a protrusion or a recess formed on an inner wall of the guide passage of the head.

5. A clasp fastening unit according to claim 3, wherein: the movable locking piece is rotatably arranged on the buckling block, and the buckling part on the movable locking piece deviates from the rotation center of the movable locking piece.

6. The snap fastening unit of claim 5, wherein: the lock catch part is a hook-shaped hook head, and the second lock member is a hook structure for hooking the hook head.

7. The snap fastening unit of claim 6, wherein: the trigger piece is a lever arm fixed or integrally formed on the movable lock piece, the lever arm and the movable lock piece form a lever structure with a pivot point between the lever arm and the hook head, the lock piece spring is used as a trigger end return spring for driving the lever arm to a non-trigger state, and the lower avoidance driving surface is a convex arc-shaped curved surface.

8. The snap fastening unit of claim 7, wherein: the locking piece spring is a compression coil spring, one end of the compression coil spring is propped against the buckling block, the other end of the compression coil spring is propped against the lever arm, the lever arm is in a hook shape, and the compression coil spring is correspondingly arranged in a hook opening of the lever arm.

9. The snap fastening unit of claim 5, wherein: the trigger piece is a sliding piece which is arranged on the buckle block in a sliding mode, the sliding direction of the trigger piece is consistent with that of the buckle block, one end of the trigger piece is provided with a trigger end portion for operating the trigger component to a trigger state, the other end of the trigger piece is provided with a driving end portion, the lock catch portion is an abutting end portion on the movable lock piece, a tripping action portion in transmission connection with the driving end portion is arranged on the movable lock piece, the second lock component is a concave portion which is formed by concavely arranging the inner wall of the guide channel, the concave portion is provided with a stop surface for abutting against the abutting end portion, and the other end, opposite to the abutting end of the movable lock piece, of the lock piece spring abuts against the inner wall of the buckle block or the guide channel.

10. The snap fastening unit of claim 9, wherein: the tripping action part is a pushing arm on the movable lock piece, and the driving end part is in pushing fit with the pushing arm.

11. The snap fastening unit of claim 5, wherein: the locking part on the movable lock piece is an abutting end part positioned at the side of the rotation center of the movable lock piece, the second lock component is a concave part concavely arranged in the guide channel, the concave part is provided with a stop surface for abutting against the abutting end part, the abutting end part abuts against the stop surface to form a first lock component and a second lock component for locking, the movable lock piece is provided with a sliding slot, the sliding slot is positioned between the locking part and the rotation center of the movable lock piece, the trigger piece is provided with an inserting arm, the inserting arm of the trigger piece is inserted in the sliding slot in a sliding manner to form relative sliding fit between the trigger piece and the movable lock piece, and the inserting arm of the trigger piece abuts against one side wall of the sliding slot, which is close to the movable lock piece, so as to form linkage of the trigger piece and the movable lock piece in the rotation direction; when the head is inserted into the thin-wall through hole, the periphery of the through hole on the thin wall is propped against the upper trigger surface, the trigger piece is propped against the wall of the sliding slot through the plug-in arm, so that the movable lock piece is driven to rotate until the abutting end part is separated from the stop surface, the trigger end part reset spring is arranged between the trigger piece and the movable lock piece, the buckle block is provided with a guide wall which limits the rotation of the trigger piece and guides the trigger piece to slide linearly, and in the process that the head is separated from the thin-wall through hole, the lower avoidance driving surface is propped against the periphery of the thin-wall through hole, and the trigger piece slides linearly under the arrangement of the guide wall.

12. The snap fastening unit according to claim 2, wherein: the clamping block is concavely provided with an assembly groove along the thickness direction, a corresponding convex part surrounding the assembly groove is formed on the clamping block, the clamping surface of the clamping head extends to the convex part, and the first lock component and the trigger component are uniformly distributed in the assembly groove.

13. The snap fastening unit according to claim 1, wherein: the front end face of the chuck is provided with a flat end face which extends from one side close to the clamping face to one side far away from the clamping face along the height direction of the clamping block.

14. The snap fastening unit of claim 13, wherein: and the end corner of the head part, which corresponds to the guide channel port and is far away from the fastening support wall, is provided with a chamfer surface, and under the chamfer surface, the part of the flat end surface of the buckle block can be exposed out of the guide channel port through the chamfer surface in a protruding way when the buckle block is positioned at the loosening position.

15. The snap fastening unit according to claim 1, wherein: the fastener block is provided with a tool combining part which can be used for combining tools to finish pulling the fastener block to slide to a loosening position by means of the tools, the head is provided with an operation window for exposing the tool combining part, the operation window is positioned on one side of the fastening support wall, which is away from the clamping surface of the fastener block, and the operation window can be sealed by a detachable cover plate or is directly opened and arranged on the head.