Buckle fastening structure, lock and hinge

Abstract

The utility model relates to a buckle fastening structure, lock and hinge, the head of pedestal is equipped with two pieces of clamping sliding block, and the elastic element pushes clamping sliding block to fastening position, and the longitudinal edge of one side of two pieces of clamping sliding block is equipped with recess, and the cam member on the end of pedestal includes the locating shaft portion that rotates on the locating on the pedestal, and the axial inner end of locating shaft portion is equipped with two mutually radial opposite arrangement cam parts, and two cam parts are one -to -one and are inserted in the recess of two pieces of clamping sliding block, and the cam part is equipped with cam surface of convex arc and the butt joint in the end of cam surface of jacking end face, when the tool end on the axial outer end of locating shaft portion operates cam member rotation, the cam surface of cam member and stop surface abut, thereby drive clamping sliding block to slide to the retracted position, and when the jacking end face and stop surface abut of cam member rotation, because the thrust of two pieces of clamping sliding block reaches the balance and locates self -lock in the position. Have state keeping function, and simple structure and convenient operation.

Description

Technical Field

[0001] This utility model relates to the field of mechanical installation, specifically to a snap-fit ​​fastening structure for fastening and fixing equipment (such as locks, hinges, handles, or thin plates, etc.) with snap-fit ​​installation. Background Technology

[0002] Snap-fit ​​fastening is a cost-effective mechanical fastening solution that eliminates the need for screws. It requires only a simple through-hole in a thin-walled component, which can be attached to objects such as housing walls, door panels, louvers, frames, door frames, or plate-like parts. Therefore, it is widely used in various applications, such as connecting two or more components with these thin walls together, or attaching latches, handles, or other devices to frames with thin walls. Snap-fit ​​fastening structures can be standalone components or integrated into related equipment.

[0003] An existing snap-fit ​​fixing structure includes a base, a snap-fit ​​assembly, and an elastic element. The base has a fastening support wall and a head extending away from the fastening support wall. The head has a guide channel. The snap-fit ​​assembly includes a snap-fit ​​slider that slides within the guide channel. The snap-fit ​​slider has a snap-fit ​​end and a fastening position where the snap-fit ​​end extends beyond the end of the guide channel. In this fastening position, the snap-fit ​​end engages with the fastening support wall to form a through hole in the thin wall, after which the head is snapped and fixed to the thin wall. The snap-fit ​​slider is pushed to the fastening position by the elastic element. The snap-fit ​​end has a bevel, and the head is snapped into the thin wall. During the assembly of the through hole, the edge of the through hole touches the inclined surface, and during the continuous installation force, the retaining slider is forced to retract. After the snap-fit ​​fixing structure is installed in place, the retaining slider is pushed to the fastened position by the elastic element. The retaining slider on the head usually includes a first retaining slider and a second retaining slider with the retaining ends facing opposite directions. For example, the snap-fit ​​fastening structure for locks disclosed in patent document CN202220776117.9 requires a tool to press the retaining end of the retaining slider to achieve the retraction of the retaining slider during disassembly, which has the drawback of being difficult to operate.

[0004] Given the inconvenience of disassembling traditional snap-fit ​​fasteners, quick-release snap-fit ​​fasteners have been developed. One type of structure features a notch along the longitudinal edge of the latching slider and a tool opening on the base end face. The wing-shaped part of the knob is inserted into the notch along the tool opening, and when the knob is turned, the wing-shaped part pushes against a stop surface in the notch to pull the latching slider back (the latching slider exits the fastened position), allowing the head to be pulled out through the thin-walled through-hole, completing the disassembly. However, while this design makes disassembly more convenient than traditional snap-fit ​​fasteners, the latching slider is continuously pushed towards the fastened position by an elastic element during disassembly. Therefore, continuous force is still required to keep the knob pulling the latching slider back, thus still posing a challenge to the operator. Another structural form, such as the snap-fit ​​fastening structure disclosed in patent document CN202421189498.6, employs a series of teeth holes arranged longitudinally on the holding slider. A rotatable ratchet shaft is mounted on the base, with a toothed ring on the ratchet shaft engaging with the teeth holes. Rotating the ratchet shaft causes the holding slider to slide and retract. A ratchet tooth is also provided on the ratchet shaft. A ratchet plate is pressed against the ratchet shaft by a spring and engages with the ratchet tooth, locking the ratchet shaft. To disassemble the snap-fit ​​fastening structure, the ratchet plate is pulled outwards with a finger, and then the ratchet shaft is rotated. The ratchet plate is then released, and it re-locks onto the ratchet shaft, maintaining the snap-fit ​​fastening structure in the retracted state of the holding slider, allowing the head to freely disengage from the thin-walled through hole. This structural form of snap-fit ​​fastening structure provides a convenient disassembly and assembly function, making the disassembly and assembly of the device (referred to as a lock in the document) much easier. However, it is evident that its complex structure and numerous parts negatively impact the stable operation and assembly of the mechanism. Furthermore, the overall size of the snap-fit ​​fastening structure is relatively large, hindering miniaturization design. Moreover, its operation involves an additional action of manipulating the ratchet plate, making the process cumbersome.

[0005] Given the numerous inconveniences of existing technologies, we hope to continuously innovate the design of snap-fit ​​fastening structures and propose a snap-fit ​​fastening structure that combines ease of operation with simple and reliable structure. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the existing technology and provide a quick-release buckle fastening structure with a retaining slider retraction function, which has the advantages of simple structure and convenient operation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A snap-fit ​​fastening structure includes a base, a fastening support wall, and a head extending away from the fastening support wall, the head having a guide channel. And a snap-fit ​​assembly, installed in the guide channel, the snap-fit ​​assembly includes a snap-fit ​​slider and an elastic element. The snap-fit ​​slider is restricted to sliding within the guide channel. Two snap-fit ​​sliders are provided on the head, arranged radially opposite each other. The snap-fit ​​sliders have a fastening position where the snap-fit ​​ends extend out of the end of the guide channel, and a retracted position where the snap-fit ​​ends retract into the guide channel. The longitudinal edges on the same side of the two snap-fit ​​sliders are provided with a notch, and a stop surface is provided in the notch. The elastic element provides an elastic driving force to push the snap-fit ​​sliders to the fastening position. The base end is provided with a cam member that can rotate about an axis. The cam member includes a positioning shaft that rotates in the shaft hole of the base. The axial inner end of the positioning shaft is provided with a cam body. The cam body has two opposite sides. The radially opposite cam portions are inserted one-to-one into the recesses of the two retaining sliders. The cam portions have convex arc-shaped cam surfaces, and the free ends of the cam portions have top support end faces that connect to the ends of the cam surfaces. The axial outer end of the positioning shaft portion is a tool end exposed outside the base. The cam component has an initial position and a self-locking position. In the initial position, the retaining sliders are driven by the elastic element to tend to the tight position. When the cam component is rotated from the initial position to the self-locking position by the tool end, the cam surface of the cam component abuts against the stop surface, thereby driving the retaining sliders to slide to the retracted position. At the same time, when the cam component rotates to the point where the top support end face abuts against the stop surface, the force borne by the cam component reaches equilibrium and it is positioned and self-locked in the self-locking position.

[0008] Preferably, the stop surface is an inclined surface, and the stop surface is configured to form a surface contact with the top support end face of the cam member. The self-locking force of the cam member in the self-locking position and the torque required to drive the cam member to rotate to the position of disengagement from the self-locking position can be adjusted by adjusting the inclination angle of the stop surface.

[0009] Preferably, a friction damping element is provided between the positioning shaft of the cam component and the base, and the working range of the friction damping element covers at least the rotational operation range of the cam component between the initial position and the self-locking position.

[0010] Preferably, the friction damping element is an O-ring, which is fitted onto the positioning shaft of the cam component. The rubber ring makes elastic contact with the wall of the shaft hole on the base for mounting the positioning shaft to form friction damping.

[0011] Preferably, the guide channel is configured as a through hole along the sliding direction of the holding slider, allowing the buckle assembly to enter and exit the guide channel, and the holding slider is restricted within the guide channel by a cam portion stop placed in the recess.

[0012] Preferably, there is a clearance space between the surface of the notch opposite to the stop surface and the cam portion. This clearance space allows the locking slider to slide to the retracted position under force at its locking end without touching the cam component in the initial position. The side of the locking end facing the head extension direction is provided with a pushing slope. When a top pressure is applied to the pushing slope along the head extension direction, the locking slider is driven by the pushing slope to generate a retracted movement.

[0013] Preferably, the head is a rectangular body, and the two side walls of the head are provided with clearance windows. The clearance windows extend laterally into the guide channel and correspond to the position of the notch of the holding slider. The clearance windows correspond to the free end of the cam part and are configured to provide accommodating space when the free end of the cam part extends out of the notch of the holding slider.

[0014] Preferably, the base includes a housing component with an end opening, the fastening support wall and the head are integrally formed on the housing component, the end opening extends to the guide channel, the end opening allows the cam part to be placed in the guide channel, the end opening is covered with a cover plate with the shaft hole, the positioning shaft part is rotatably disposed in the shaft hole of the cover plate, and the cam part and the positioning shaft part are integrally formed.

[0015] In another design, the base is an integrally formed box shape, and the two cam parts are integrally formed into a cam body. A lateral window is opened on the side wall of the head, which extends into the guide channel. The holding slider has a cam assembly position where its notch corresponds to the position of the lateral window. In this cam assembly position, the cam body is placed into the guide channel along the lateral window, and the cam part and the notch of the holding slider are correspondingly engaged. The inner end of the positioning shaft passes through the shaft hole and extends into the guide channel. Its end is connected to the middle of the cam body, so that the positioning shaft part and the cam body form a rotational linkage.

[0016] Preferably, the cam body has a socket hole at its center, and the axial inner end of the positioning shaft has a protruding pin that is inserted into and confined in the socket hole.

[0017] Preferably, the end of the shaft hole that connects to the guide channel is provided with an axially restricting bottom wall and an insertion through hole. The insertion through hole is composed of a centrally located post hole and a lateral groove extending radially outward from the post hole to the axially restricting bottom wall. The axially inner end of the positioning shaft portion has a boss that inserts into the central post hole. The protruding pin portion is formed at the end of the boss and protrudes radially from the edge of the boss. The cam component can be in an assembled position and an initial position. In the assembled position, the insertion hole of the cam body, the radially protruding end of the protruding pin portion, and the lateral groove are aligned. In this state, the protruding pin... The part can pass through the central post hole and be inserted into the connector hole. The radially protruding end of the convex pin part stops against the axially limiting bottom wall, thereby preventing the positioning shaft part from coming out of the shaft hole. At the same time, the holding slider is in the cam assembly position. In the initial position, the cam member is pushed by the holding slider that has entered the fastening position, and the limiting surface on the cam part and the radial surface of the holding slider are used to achieve a stop and limit. The assembly position is located on the opposite side of the initial position in the retraction operation direction. The retraction operation direction is the direction in which the operating cam member drives the holding slider to move from the fastening position to the retraction position.

[0018] Preferably, the center of the outer axial end of the positioning shaft is recessed with a screwing tool matching port, thereby forming a tool end.

[0019] The snap-fit ​​fastening structure provided by this utility model is used for snap-fit ​​fastening to one or more thin-walled components with through holes. This snap-fit ​​fastening structure can be used as an independent fastening component and can also be applied to various scenarios such as locks, hinges, and handles, possessing significant application value. The snap-fit ​​fastening structure utilizes a cam component to drive the retraction of the holding slider. Furthermore, utilizing the structural design of the cam component itself, the convex arc-shaped cam surface can smoothly push the holding slider back, and when the holding slider is pushed open by the elastic element, it can smoothly and reliably push the cam component back to its original position. The holding slider... When slid to the retracted position, the top support face of the cam component can enter the stop face of the retaining slider. The two retaining sliders act on the cam component, making the cam component self-locking. That is, the cam component self-locking keeps the retaining slider in the retracted position. The interaction between the cam component and the two retaining sliders maintains the snap-fit ​​fastening structure in a stable and detachable state, making the assembly and disassembly of the snap-fit ​​fastening structure simpler and more convenient. Compared with traditional snap-fit ​​fastening structures with the same retaining function, it has the advantages of simple structure, easy assembly, and easy operation. Moreover, the design of the cam component can further achieve a compact design of the overall structure. For example, the two retaining sliders can be arranged adjacent to each other in some traditional snap-fit ​​fastening structures. Therefore, on the other hand, while maintaining the overall volume of the snap-fit ​​fastening structure, the thickness of the retaining slider can be guaranteed, ensuring the strength and reliability of the snap-fit ​​fastening structure installation.

[0020] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1a This is a diagram showing the state of the slider in the snap-fit ​​fastening position according to Embodiment 1 of this utility model; Figure 1b This is a diagram showing the state of the holding slider in the retracted position according to Embodiment 1 of this utility model; Figure 2a This is a rear view of the snap-fit ​​fastening structure according to Embodiment 1 of this utility model; Figure 2b for Figure 2a A sectional view taken along line AA. Figure 2c for Figure 2a A sectional view cut along line BB. Figure 3 This is an exploded view of the snap-fit ​​fastening structure according to Embodiment 1 of this utility model; Figure 4a , Figure 4b This is a schematic diagram of the cam component structure according to Embodiment 1 of this utility model; Figure 5a , Figure 5b This is a schematic diagram of the holding slider structure according to Embodiment 1 of this utility model; Figure 6a , Figure 6b This is a schematic diagram of the base structure according to Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the buckle fastening structure in Embodiment 2 of this utility model; Figure 8a Rear view of the snap-fastening structure in Embodiment 2 of this utility model; Figure 8b for Figure 8a A sectional view cut along the CC line; Figure 8c for Figure 8a A sectional view cut along line DD; Figure 9 This is a schematic diagram of the base structure of Embodiment 2 of this utility model; Figure 10 This is a schematic diagram of the holding slider structure according to Embodiment 2 of this utility model; Figure 11a This is the first state diagram of Embodiment 2 of the present invention, showing the cam component in the initial position and the locking slider in the fastened position; Figure 11b This is the second state diagram of Embodiment 2 of the present invention, showing the cam component in the initial position and the locking slider in the retracted position; Figure 11c This is the state of Embodiment 2 of this utility model. Figure 3 The cam component rotates until the end of the cam surface corresponds to the stop surface; Figure 11d and Figure 11e As shown in Figure 4 of Embodiment 2 of this utility model, the cam component rotates to align with the top support end face and the stop face; Figure 12 This is a schematic diagram of the assembly process of a cam component with a snap-fit ​​fastening structure using an integral base; Figure 13 for Figure 12 A schematic diagram of the snap-fit ​​fastening structure in the middle; Figure 14 for Figure 13 A sectional view taken along line EE; Figure 15 A schematic diagram illustrating the assembly process of a cam component using a snap-fit ​​fastening structure with an integral base; Figure 16 This is a schematic diagram of an installation scenario using a snap-fit ​​fastening structure with a driving ramp design. Figure 17 A schematic diagram illustrating a scenario where the snap-fit ​​fastening structure of the drive ramp is removed during installation (or disassembly). Figure 18 This is a schematic diagram of the cam component assembly process in Example 3; Figure 19 for Figure 18 Internal structure diagram in assembled state (cam component in assembled position). Figure 20a This is a diagram showing the state of the snap-fit ​​fastening structure in Embodiment 3, where the cam component is in the initial position and the snap-fit ​​slider is in the fastened position. Figure 20b for Figure 20a The positioning axis is omitted from the diagram under the current state; Figure 20c for Figure 20a Internal structure diagram under the current condition; Figure 21a This is a diagram showing the state of the snap-fit ​​fastening structure in Embodiment 3, where the cam component rotates to correspond with the top support end face and the stop face (the cam component is in the self-locking position). Figure 21b for Figure 21a Internal structure diagram under the current condition; Figure 22 This is a schematic diagram of the base structure in Example 3; Figure 23 This is a schematic diagram of the cam body structure in Example 3; Figure 24 This is a schematic diagram of the positioning shaft structure in Embodiment 3; Figure 25aThis is a schematic diagram of the installation scenario for the snap-fit ​​fastening structure with a driving inclined surface design, as described in Example 3. Figure 25b for Figure 25a A sectional view taken along line FF; Figure 26 A schematic diagram of a cam component structure under an elastic locking assembly structure; Figure 27 for Figure 26 A schematic diagram of the cam body structure of the cam component; Figure 28 for Figure 27 Schematic diagram of the positioning shaft of the cam component; Figure 29 A schematic diagram of the cam body structure under another elastic element locking assembly structure; Figures 30a-30e This is a schematic diagram of the snap-fit ​​fastening structure assembly scheme of this utility model; Figures 31a-31b This is a schematic diagram of the application scheme of the snap-fit ​​fastening structure of this utility model integrated into a lock; Figures 32a-32d This is a schematic diagram of the application scheme of the buckle fastening structure of this utility model integrated into the hinge. Detailed Implementation

[0022] This utility model discloses a snap-fit ​​fastening structure K for snap-fit ​​fastening to one or more thin-walled components 9 with through holes 90. The thin-walled component can be attached to a shell wall, door leaf, louver, frame, door frame, or plate-like component. This snap-fit ​​fastening structure can be used as a stand-alone fastening accessory (see [link]). Figures 1a-30e , Figure 16 , Figure 17 and Figure 25b (The diagram illustrates the usage scenarios shown in the image). It can also be used as an additional structure to assist in the installation of some devices (see [reference]). Figures 31a-32d The snap-fit ​​fastening structure includes a base 1, a snap-fit ​​assembly, and a cam component 4. The snap-fit ​​assembly includes a holding slider 2 and an elastic element 3.

[0023] The base 1 has a fastening support wall 11 and a head 12 extending away from the fastening support wall 11. The fastening support wall 11 is a plate-like structure. When the head 12 is inserted into the through hole of the thin wall, the fastening support wall 11 abuts against the thin wall. The head 12 is provided with a guide channel 121. The snap-fit ​​assembly is installed in the guide channel 121. The snap-fit ​​slider 2 is restricted to slide within the guide channel 121. Two snap-fit ​​sliders 2 are arranged radially opposite to each other on the head 12. That is, the snap-fit ​​fastening structure forms a snap-fit ​​fixing force in two opposite directions, achieving a more stable snap-fit ​​fixation. The snap-fit ​​slider 2 has a snap-fit ​​end 21. The snap-fit ​​slider 2 has a fastening position where the snap-fit ​​end 21 extends out of the end of the guide channel 121 (see...). Figure 7 , Figure 8b and Figure 11a Alternatively, another implementation method may be referred to. Figure 1a As shown in 2a and 2b; alternative embodiments may also be referenced. Figures 20a-20c As shown), and the retracted position of the retaining end 21 retracting into the guide channel 121 (as shown). Figures 11b-11e Alternatively, another implementation method may be referred to. Figure 1b Alternatively, another implementation method may be referred to. Figures 21a-21b (As shown); in the fastened position, the clamping end 21 cooperates with the fastening support wall 11 to form a through hole in the thin wall after the head 12 protrudes into the thin wall and is clamped and fixed to the thin wall. The elastic element 3 provides an elastic driving force to push the clamping slider 2 to the fastened position. The longitudinal edge of the two clamping sliders 2 on the same side is provided with a notch 22. Through this notch 22, two surfaces are formed on the clamping slider 2 located in the notch 22. One of the surfaces in the notch 22 is a stop surface 221.

[0024] The cam component 4 is mounted on the end of the base 1 and can rotate about an axis. Depending on actual needs, the cam component 4 is mounted on the corresponding end of the base 1 (defined in the direction Y where the snap-fit ​​fastening structure inserts into or disengages from the through hole in the thin wall; the end refers to either of the two endpoints of the base 1 in that direction Y). See [link to relevant documentation]. Figures 7-11d (Another embodiment is attached) Figures 1a-3 , Figure 15 , Figure 32c , Figure 32d The cam component 4 can be installed at the rear end where the base 1 and the fastening support wall 11 are located, see Appendix Figures 12-14 , attached Figure 18 and attached Figures 30a-32b In other embodiments, the cam component 4 may also be installed at the front end of the base 1 away from the fastening support wall 11.

[0025] The cam component 4 includes a positioning shaft portion 41 that is rotatably positioned on a base 1. A corresponding shaft hole 10 is provided on the base 1, and the positioning shaft portion 41 is installed into the shaft hole 10. A cam body 42 is provided at the axial inner end of the positioning shaft portion 41. The cam body 42 has two cam portions 421 arranged radially opposite to each other. The positioning shaft portion 41 and the cam portions 421 of the cam component 4 can be integrally formed (see...). Figure 2a , 2b and Figure 4a ) or for assembly (see Figures 12-15 (18~29) The two cam portions 421 are inserted into the recesses 22 of the two retaining sliders 2 in a one-to-one correspondence. When the cam component 4 is rotated, the two retaining sliders 2 can be retracted simultaneously by the two cam portions 421. The cam portion 421 is provided with a convex arc-shaped cam surface 4211. The free end of the cam portion 421 has a top support end face 4212 connected to the end of the cam surface 4211. The axial outer end of the positioning shaft portion 41 is a tool end 411 exposed outside the base 1. Figure 11c The configuration (unstable position) of the cam surface 4211 and the stop surface 221 in contact during the retraction phase of the holding slider 2 is shown. Figure 11d This demonstrates the configuration (stable position) when the top support end face 4212 slides onto the stop face 221 in the final stage. Figure 21a and Figure 21b As demonstrated, when the cam member 4 is rotated via the tool end 411, the cam surface 4211 of the cam member 4 abuts against the stop surface 221, thereby driving the holding slider 2 to slide to the retracted position (from...). Figures 11a to 11c (State change), when the cam component 4 rotates to the point where the top support end face 4212 abuts against the stop face 221, it is positioned and locked in that position because the force borne by the cam component 4 reaches equilibrium (see Figure 11d Stable position). That is, cam component 4 has an initial position W2 (see... Figure 11a and Figure 11b Or such as Figures 20a-20c In the initial position W2, the two cam portions 41 of the cam member 4 are oriented towards the arrangement direction of the two clamping sliders 2. The clamping sliders 2 tend to be in a fixed position under the drive of the elastic element 3. When the cam member 4 is rotated, the cam portion 421 rotates accordingly, and the cam surface 4211 touches the stop surface 221 of the clamping slider 2. If the cam member 4 is continuously rotated, the cam surface 4211 pushes against the stop surface 221, and the clamping slider 2 overcomes the elastic force of the elastic element 3 and slides back. When the stop surface 221 slides to the end of the cam surface 4211 (see Appendix), Figure 11cWhen the retaining slider 2 slides to the retracted position, the device is in the configuration (unstable position) where the stop surface 221 and the cam surface 4211 are in contact. If the screwing force applied to the cam member 4 is removed, the retaining slider 2, which is subjected to elastic force, acts in the opposite direction on the cam surface 4211 via the stop surface 221. The cam member 4 then rotates in the opposite direction to reset, and the retaining slider 2 also slides back to its original position. Figure 11c Switch to Figure 11a In the current state, the cam surface 4211 allows the cam component 4 to return to its original position smoothly. When the cam component 4 continues to be turned, the top support end face 4212 of the cam component 4 abuts against the stop surface 221. The cam component 4 is simultaneously subjected to the thrust applied by the two clamping sliders 2. After the top support end face 4212 of the cam component 4 abuts against the stop surface 221, the contact position forms a resistance that hinders the cam component 4 from rotating back to its original position. The cam component 4 is in a self-locking position. At the same time, there is frictional resistance between the cam component 4 as a movable assembly and the base 1. When the force acting on the cam component 4 reaches equilibrium, when the turning force applied to the cam component 4 is removed, the cam component 4 and the clamping sliders 2 remain in a stable state. In this stable state, the clamping sliders 2 are in the retracted position, and the head 12 can freely enter and exit the thin-walled through hole.

[0026] Figures 2a-3 , Figures 6a-9 The diagram shows one structural design of the base 1. The base 1 includes a housing component 1-1 integrally formed with a fastening support wall 11 and a head 12. An end opening 1-11 is provided at the end of the housing component 1-1, extending to a guide channel 121. A cover plate 1-2 with the aforementioned shaft hole is placed over the end opening. The end of the housing component 1-1 is designed with a certain thickness. With this thickness, the cover plate 1-2 is embedded into the end opening 1-11, thus better ensuring the structural strength of the housing component. The cover plate 1-2 can be fixed by screws, riveting, or hot-melt riveting (the specific fixing method can be selected by those skilled in the art according to actual needs; for example, if the base 1 is a plastic part, hot-melt riveting can be used). Figure 31b As shown, screws can also be used - such as Figure 2a As shown, when the base 1 is made of metal, it can be fixed by stamping and riveting, or by using screws for fastening, etc. A shaft hole 10 is provided on the cover plate 1-2 of the base 1. The positioning shaft part 41 is inserted into the shaft hole 10 and can rotate. The shaft hole 10 is stepped, and the positioning shaft part 41 is a matching stepped shaft. Because the cam body 42 can be easily placed into the guide channel 121 through the end opening 1-11 under the above-described base 1 structure, the positioning shaft part 41 and the cam body 42 of the cam component 4 can be preferably machined as a single unit to achieve simpler forming and greater overall structural strength (this does not exclude the possibility of separately machining the positioning shaft part 41 and the cam body 42 and then assembling them; rather, machining the cam component as a whole is the preferred method).

[0027] Figures 12-15 See also Figures 18-22 The diagram shows another structural scheme for the base 1. The base 1 is integrally machined and formed into a box shape, meaning that both ends of the base 1 are complete end faces. A shaft hole 10 is provided on one end face of the base 1. To ensure the feasibility of installation, the positioning shaft part 41 and the cam part 421 need to be machined separately and then assembled. The axial inner end of the positioning shaft part 41 has a protruding pin part 412. The two cam parts 421 are integrally formed into a cam body 42. The cam body 42 has a connecting hole 422 at its center. The protruding pin part 412 is inserted into the connecting hole 422. After the cam part 421 is placed into the guide channel 121, the positioning shaft part 41 is installed in the shaft hole 10 and the protruding pin part 412 is inserted into the connecting hole 422 and confined in the connecting hole 422, so that the positioning shaft part 41 and the cam body 42 form a rotational linkage. The linkage between the positioning shaft 41 and the cam body 42 is not limited to this specific embodiment. It can also be other interlocking structures or fastener fixation, etc. However, the design of this specific embodiment is simpler and more reasonable, and the combination is convenient and reliable.

[0028] As a feasible assembly method, the cam body 42 can be pre-associated with the retaining slider 2. The cam part 421 and the retaining slider 2 have a stable configuration in which the top support end face 4212 abuts against the stop face 221. The cam part 421 is placed in the recess 22 of the two retaining sliders 2, and then pushed into the guide channel 121 along the opening of the guide channel 121, without the need to provide an additional assembly port for the cam part 421 to be placed into the guide channel 121. However, the cam part 421 is difficult to assemble. Preferably, a side window III is opened on the side wall of the head 12, which extends into the guide channel 121. The block has a cam assembly position, in which the lateral window III corresponds to the recess 22 of the retaining slider 2. The cam body 42 is inserted into the guide channel 121 from the lateral window III along the arrangement direction of the two retaining sliders 2 and fits into the recess 22. Then, the positioning shaft 41 is installed into the shaft hole 10, and the positioning shaft 41 and the cam 421 are connected. During the assembly process of the snap-fit ​​structure, the retaining slider 2 is maintained in the cam assembly position. Compared with the method of assembling the cam part after it is associated with the retaining slider 2 and the retaining slider is moved to the retracted position, the assembly is easier. Figure 15 As shown, the side window III can be used with a wider base 1, see Appendix Figures 12-14 It can also be used on narrow bases 1. A side window III can be provided on one side wall of the head 12, or a side window III can be provided on both side walls of the head 12.

[0029] The protruding pin 412 can be confined within the insertion hole 422 by means of press-fitting, adhesive bonding, or a resilient locking mechanism, etc. Preferably, such as... Figures 18-25b As shown, specifically: the shaft hole 10 is connected to the guide channel 121 at one end, which is provided with an axially restricting bottom wall 100 and an insertion through hole 101. The insertion through hole 101 is composed of a centrally located column hole 1011 and a lateral groove 1012 extending from the column hole 1011 in the diametrical direction of the shaft hole 10. The lateral groove 1012 corresponds to the position of the axially restricting bottom wall 100. The axial inner end of the positioning shaft portion 41 has a boss 413 that is inserted into the central column hole 1011. The protruding pin portion 412 is formed at the end of the boss 413 and protrudes radially from the edge of the boss 413 (as shown in the figure, the radially protruding end 4121 of the protruding pin portion 412). The cam member 4 can be in an assembly position W1 (e.g., Figure 18 and Figure 19 As shown in the figure, the assembly position W1 is located on the opposite side of the initial position W2 in the retraction operation direction. The retraction operation direction is the direction in which the operating cam component 4 drives the holding slider 2 to move from the fastened position to the retracted position. In the assembly position, that is, outside the normal working angle range of the cam component 4, the insertion hole 422 of the cam body 42, the radial protruding end 4121 of the cam pin 412, and the lateral groove 1012 are aligned, and the holding slider 2 is in the cam assembly position. In this state, the cam pin 412 can pass through the insertion through hole 101 and be inserted into the insertion hole 422. See Appendix Figure 20b When the cam member 4 enters the rotational operating range between the initial position W2 and the self-locking position W3, the radially protruding end 4121 of the cam pin 412 abuts against the axially restricting bottom wall 100, thereby preventing the positioning shaft 41 from dislodging from the shaft hole 10; Figure 20c In the initial position W2, the cam member 4 is engaged by the retaining slider 2, which is in the fastened position. Specifically, the retaining slider 2, driven by the elastic element, abuts against the cam member 4, and stops and limits itself by the contact between the limiting surface 4213 on the cam portion 421 and the radial surface of the retaining slider 2. The cam member 4 cannot be rotated back to the assembled position. Thus, after the snap-fit ​​structure is assembled, under normal working conditions, simply operating the cam member will not align the radial protrusion 4121 on the positioning shaft portion 41 of the cam member and the lateral groove 1012, thereby maintaining the cam member in a stable connection. This makes the assembly of the cam member more convenient.

[0030] As another convenient elastic locking assembly structure, such as Figures 26-28As shown, the cam body 42 is provided with an elastic retainer 44, which is formed by bending a metal elastic rod. The elastic retainer 44 includes an elastic retaining body 441 and an elastic retaining arm 442. The elastic retaining body 441 adopts a simple U-shaped design, and the two free ends of the elastic retaining body 441 are bent in the opposite direction to the inside of the U-shape to form the elastic retaining arm 442. An insert groove 423 and a insertion hole 422 are recessed on the axial end face of the cam body 42. Located at the bottom of the mounting groove 423, the elastic locking body 441 is elastically secured within the mounting groove 423. The elastic locking arm 442 corresponds to the edge of the insertion hole 422. The edge of the protruding pin 412 is provided with a slot 4122. When the protruding pin 412 is inserted into the insertion hole 422, it will compress the elastic locking arm 442, causing it to elastically deform. After being inserted into place, the elastic locking arm 442 returns to its original position and locks into the slot 4122 of the protruding pin 412, thereby achieving locking. Of course, those skilled in the art can also design other elastic locking components 44, such as... Figure 29 As shown, the elastic clip is fixed to the cam body by wrapping around it, but this method is structurally complex and inconvenient to use; therefore, a method such as... Figures 26-28 The elastic clips and assembly structure are shown.

[0031] In most application scenarios, we want to retain the quick assembly characteristics of the snap-fit ​​fastening structure, with the cam component only intervening during the disassembly of the snap-fit ​​fastening structure. The holding end 21 has a pushing slope 211 on the side facing the extension direction of the head 12. This pushing slope 211 is used to bear external force to drive the holding slider 2 to slide back. Furthermore, a clearance space II exists between the surface 222 of the recess 22 opposite to the stop surface 221 and the cam portion 421. This clearance space II allows the holding slider 2 to slide to the retracted position without touching the cam component 4. When the head 12 protrudes into the through hole 90 of the thin wall 9, the edge of the through hole 90 presses against the pushing slope 211. During the continuous application of the through hole, a pushing force is applied to the pushing slope 211 along the extension direction of the head 12, causing the holding slider 2 to retract under the drive of the pushing slope 211. (See Appendix) Figures 11a to 11b Therefore, the above design can meet the requirements of most installation scenarios, where it is not necessary to screw the cam component 4 to the retracted state of the retaining slider 2 (such as...). Figure 16 As shown; or Figure 25aAs shown in ~b), the head 12 can be directly inserted into the thin-walled through hole. The edge of the through hole presses against the inclined surface 211, forcing the retaining slider 2 to slide back, thus achieving a quick installation operation. During disassembly, the cam component 4 is screwed to drive the retaining slider 2 to the retracted state and lock it in place. Once the protrusion 12 is completely disengaged from the thin-walled through hole and the snap-fit ​​fastening structure is removed from the equipment, the cam component 4 can be reset to its initial position. During the cam component 4 reset operation, simply screw the cam component 4 until the top support end face 4212 disengages from the stop face 221. The stop face 221 and the cam face 4211 correspond (see [reference]). Figure 11c In the unstable state, the cam component 4 and the retaining slider 2 can automatically reset under the elastic force of the elastic element 3. Therefore, the tool (cam component 4) only functions during the disassembly process of the snap-fit ​​fastening structure. The snap-fit ​​fastening structure retains its quick-installation function in some application scenarios.

[0032] In other application scenarios, such as heavy-duty scenarios, the door body where the hinge with the snap-fit ​​fastening structure is located is very heavy, thus requiring a strong snap-fit ​​fastening force, and the spring force applied to the latching slider 2 will also be extremely high. In this case, directly using the aforementioned quick assembly method for the snap-fit ​​fastening structure would result in excessively high operating force for the user during snap-fit ​​installation. Therefore, as... Figure 17 As shown, the tool (cam component 4) is not only used in the disassembly stage, but can also be involved in the assembly stage of the snap-fit ​​fastening structure. That is, the user can first use the tool to operate the cam component 4, causing the retaining slider 2 to retract until the snap-fit ​​fastening structure is in a stable state. After the hinge is in place in the through hole, the same tool can be used again to release the cam component 4, completing the assembly. In the above scenario, as... Figure 17 As shown, the clamping end 21 of the clamping slider 2 does not need to be designed with a push-up slope. The clamping end 21 is a flat end with a flat end face, which enables it to obtain higher strength and thus cope with heavy load scenarios, such as the installation of heavy door bodies.

[0033] In a preferred embodiment, the stop surface 221 is inclined and is configured to form a surface contact with the top support end face 4212 of the cam member 42. The self-locking force of the cam member 4 in the self-locking position and the torque M required to drive the cam member 4 to rotate back to the disengaged self-locking position can be adjusted by adjusting the inclination angle θ of the stop surface 221. Figure 11d and 11e As shown, M (torque) = F * a (lever arm), so the effective lever arm can be changed by adjusting the tilt angle of the stop surface 221, thereby adjusting the operating torque.

[0034] The stability of the cam component 4 is improved by increasing the frictional damping force between the cam component 4 and the base 1. A frictional damping element is provided between the positioning shaft 41 of the cam component 4 and the base 1. The working range of this frictional damping element covers at least the rotational operating range of the cam component 4 between the initial position W2 and the self-locking position W3, and is used to form frictional damping between the positioning shaft 41 and the base 1 in the working range of the cam component 4. Under this design, when no external active force is applied to the cam component, the angular position stability of the cam component is guaranteed, ensuring that the cam component will not rotate due to adverse environmental influences such as gravity or vibration. In applications of quick installation of snap-fit ​​fastening structures (such as...) Figure 25b As shown, when the cam member is in the initial position W2, necessary angular frictional damping is provided. Because in this position, when the thin wall 9 is engaged (at which point the cam member 4 is not in contact with the holding slider 2), it must be ensured that the cam member does not shift; simultaneously, the presence of frictional damping also provides corresponding assistance for maintaining the cam member in the self-locking position. Therefore, this design can be coordinated with the tilt angle adjustment of the stop surface 221, so that the tilt angle of the stop surface 221 does not need to be designed to be too large. As a simple and reliable method, the frictional damping element is an O-ring rubber ring 43, which is fitted onto the positioning shaft portion 41 of the cam member 4. An annular sealing groove is provided on the positioning shaft portion 41, and the rubber ring 43 is placed in the annular sealing groove for convenient and reliable installation. The rubber ring 43 elastically contacts the hole wall of the shaft hole 10 on the base 1 for mounting the positioning shaft portion 41 to form frictional damping. In addition, the friction damping element, with its O-ring design, not only provides the necessary damping but also meets the needs of some customers who wish to avoid abnormal noise and vibration, and achieve a smoother overall tactile experience. Specifically, the rubber ring 43 enables elastic contact during the installation of the cam component 4, thereby eliminating abnormal noise and improving the turning feel of the cam component.

[0035] Furthermore, the corresponding mating structure of the retaining slider 2 can be a relatively compact design. Specifically, the two retaining sliders 2 are arranged adjacent to each other to achieve a more compact design. Based on the adjacent design of the retaining sliders, the two retaining sliders 2 are further held together by an elastic element 3. The elastic element 3 is preferably a helical pressure spring. Therefore, the guide channel 121 can simultaneously accommodate the relatively wide dimensions of the two retaining sliders 2. The surfaces of the two retaining sliders 2 that are laterally close to each other are provided with receiving openings 23. The receiving openings 23 of the two retaining sliders 2 form a cavity I for receiving the helical pressure spring. The helical pressure spring is received in the cavity I, so that the two retaining sliders 2 and the elastic element 3 form a stable whole. This structure is conducive to pre-assembly—these three components can be held in combination by the spring, so that they can be operated independently of the other components of the snap-fit ​​fastening structure. Moreover, there is no need to set an additional limiting structure on the base to limit the stroke of the retaining slider, such as Figure 2c , 3 As shown in Figure 5a, the accommodating opening 23 can be a cavity when the thickness of the holding slider 2 is large, such as... Figure 8c , 10 As shown, when the thickness of the retaining slider 2 is relatively thin, it can be a through-hole cavity. As another compact design, the guide channel 121 is constructed as a through-hole along the sliding direction of the retaining slider 2, allowing the latching assembly to enter and exit the guide channel 121. The retaining slider 2 is restrained within the guide channel 121 by a stop provided by the cam portion 421 inserted into the recess 22. The restraint of the retaining slider within the guide channel does not require a specially designed limiting structure, resulting in a simpler and more compact structure. Of course, a design with insulating inner walls between the retaining sliders 2 is also possible.

[0036] To enable the turning operation of the cam component 4, the tool end of the cam component 4 can be a handwheel or a protruding tool engagement head. However, the above design forms a protrusion on the end face of the base 1, which inevitably increases the thickness of the base, affecting not only the appearance but also the assembly. Therefore, we propose a more advantageous solution: a turning tool matching port 4111 is recessed at the center of the axial outer end of the positioning shaft portion 41, thus forming the tool end 411. The tool end 411 can be easily set to not protrude significantly or not protrude from the end face of the base 1. The shape of the turning tool matching port can be varied (…). Figures 1a-32d It showcases various forms, such as internal hexagonal slots, star-shaped slots, cross slots, figure-eight slots, slotted slots, or triangular slots, etc. By utilizing the axial dimension of the positioning shaft, it provides a design for matching the screwing tool, thus also taking into account the positioning and installation needs of the positioning shaft.

[0037] As one implementation method, such as Figures 7-11dAs shown, the head 12 is rectangular, and its two side walls are provided with clearance windows 122. These clearance windows 122 extend laterally into the guide channel 121 and correspond to the recess 22 of the retaining slider 2. The clearance windows 122 also correspond to the free end of the cam portion 421 and are configured to provide accommodating space when the free end of the cam portion 421 extends out of the recess 22 of the retaining slider 2. In some compact applications, such as when the through-hole on a thin wall is small, the snap-fit ​​fastening structure needs to be miniaturized, keeping the thickness of the retaining slider small. Then, by utilizing the clearance windows 122 on the head 12, the cam portion of the cam member 4 can move within the space of the clearance windows when rotating, thus achieving a compact overall design. In some embodiments, for example... Figures 12-14 As shown, the functions of the clearance window 122 and the side window III can overlap, and the clearance window can also be used for the assembly of inserting the cam part into the guide channel.

[0038] In some situations, such as Figure 30a , 30b As shown in Figure 30d, the interconnected double-clamp fastening structure K of the base 1 has also been developed and applied, with a head 12 extending from both ends of a plate to achieve a double-clamp fastening structure design. Figure 30c and 30e As shown, the improved snap-fit ​​fastening structure K can also be associated with other snap-fit ​​structures to form a snap-fit ​​fastening component.

[0039] The snap-fit ​​fastening structure can be applied to a wide range of scenarios, such as locks, hinges, handles, door panels, etc. This utility model will not exhaustively list specific implementation methods. For example... Figure 31a As shown, this utility model provides an application structure for a lock, which includes a latch seat 51. The latch seat 51 forms the base of the snap-fit ​​fastening structure K. The bottom wall of the latch seat 51 has a protrusion at one end, which forms the head. Figure 31b As shown, a protrusion can also be provided at both ends of the bottom wall of the latch seat 51. Figures 32a-32d As shown, this utility model also provides an application structure for a hinge, which includes two hinge leaves 61 that are hinged to each other. The snap-fit ​​fastening structure K is disposed on one or both hinge leaves 61, and the hinge leaves 61 constitute the base of the snap-fit ​​fastening structure.

Claims

1. A snap-fit ​​fastening structure, comprising a base, a fastening support wall, and a head extending away from the fastening support wall, the head having a guide channel. A latching assembly is installed within a guide channel. The latching assembly includes a latching slider and an elastic element. The latching slider is restricted to sliding within the guide channel. Two latching sliders are arranged radially opposite each other on the head. Each latching slider has a fastening position where its latching end extends beyond the end of the guide channel, and a retracted position where its latching end retracts into the guide channel. A notch is provided on the longitudinal edge of the two latching sliders on the same side, and a stop surface is provided within the notch. The elastic element provides an elastic driving force to push the latching sliders to the fastening position. The characteristic feature is that: The base end is provided with a cam member that can rotate about an axis. The cam member includes a positioning shaft that rotates in the shaft hole of the base. The axial inner end of the positioning shaft is provided with a cam body. The cam body has two cam portions arranged radially opposite to each other. The two cam portions are inserted into the recesses of two locking sliders one by one. The cam portions have convex arc-shaped cam surfaces. The free end of the cam portion has a top support end face connected to the end of the cam surface. The axial outer end of the positioning shaft is a tool end exposed outside the base. The cam member has an initial position and a self-locking position. In the initial position, the locking slider tends to be in a tight position driven by an elastic element. When the cam member is rotated from the initial position to the self-locking position by the tool end, the cam surface of the cam member abuts against the stop surface, thereby driving the locking slider to slide to the retracted position. At the same time, when the cam member rotates to the point where the top support end face abuts against the stop surface, the force borne by the cam member reaches equilibrium and it is positioned and self-locked in the self-locking position.

2. The snap-fit ​​fastening structure according to claim 1, characterized in that: The stop surface is an inclined surface, and the stop surface is set to form a surface contact with the top support end face of the cam component. The self-locking force of the cam component in the self-locking position and the torque required to drive the cam component to rotate to the position of disengaging from the self-locking position can be adjusted by adjusting the inclination angle of the stop surface.

3. The snap-fit ​​fastening structure according to claim 1, characterized in that: A friction damping element is provided between the positioning shaft of the cam component and the base. The working range of the friction damping element covers at least the rotational operation range of the cam component between the initial position and the self-locking position.

4. The snap-fit ​​fastening structure according to claim 3, characterized in that: The friction damping element is an O-ring rubber ring, which is fitted onto the positioning shaft of the cam component. The rubber ring elastically contacts the wall of the shaft hole on the base for mounting the positioning shaft to form friction damping.

5. The snap-fit ​​fastening structure according to claim 1, characterized in that: The guide channel is configured as a through hole along the sliding direction of the holding slider, allowing the buckle assembly to enter and exit the guide channel. The holding slider is restricted within the guide channel by a cam stop placed in the recess.

6. The snap-fit ​​fastening structure according to claim 1, characterized in that: There is a clearance space between the surface opposite the stop surface in the notch and the cam portion. This clearance space allows the locking slider to slide to the retracted position under force at its locking end without touching the cam component in the initial position. The side of the locking end facing the head extension direction is provided with a pushing slope. When a top pressure is applied to the pushing slope along the head extension direction, the locking slider is driven by the pushing slope to generate a retracting movement.

7. The snap-fit ​​fastening structure according to claim 1, characterized in that: The head is rectangular, and there are clearance windows on both sides of the head. The clearance windows extend laterally into the guide channel and correspond to the position of the notch of the holding slider. The clearance windows correspond to the free end of the cam and are configured to provide accommodating space when the free end of the cam extends out of the notch of the holding slider.

8. The snap-fit ​​fastening structure according to claim 1, characterized in that: The base includes a housing component with an end opening at one end. The fastening support wall and the head are integrally formed on the housing component. The end opening extends to the guide channel, and the end opening allows the cam part to be placed into the guide channel. The end opening is covered with a cover plate with the shaft hole. The positioning shaft part is rotatably disposed in the shaft hole of the cover plate. The cam part and the positioning shaft part are integrally formed.

9. The snap-fit ​​fastening structure according to claim 1, characterized in that: The base is an integrally formed box shape, and the two cam parts are integrally formed into a cam body. A side window is opened on the side wall of the head, which extends into the guide channel. The holding slider has a cam assembly position whose notch corresponds to the position of the side window. In this cam assembly position, the cam body is placed into the guide channel along the side window, and the cam part and the notch of the holding slider are correspondingly engaged. The inner end of the positioning shaft passes through the shaft hole and extends into the guide channel. Its end is connected to the middle of the cam body, so that the positioning shaft part and the cam body form a rotational linkage.

10. The snap-fit ​​fastening structure according to claim 9, characterized in that: The cam body has a socket hole at its center, and the axial inner end of the positioning shaft has a protruding pin that is inserted into and confined in the socket hole.

11. The snap-fit ​​fastening structure according to claim 10, characterized in that: The shaft hole and guide channel are connected at one end with an axially restricting bottom wall and an insertion through hole. The insertion through hole consists of a centrally located cylindrical hole and a lateral groove extending from the cylindrical hole toward the shaft hole in a diametrical direction. The axial inner end of the positioning shaft has a boss that inserts into the central cylindrical hole. The protruding pin is formed at the end of the boss and protrudes radially from the edge of the boss. The cam component also has an assembly position. In the assembly position, the insertion hole of the cam body, the radially protruding end of the protruding pin, and the lateral groove are aligned, and the retaining slider is in the cam assembly position. In this state, the protruding pin can pass through the insertion hole. The through hole is inserted into the connector hole; when the cam member enters the rotational operation range between the initial position and the self-locking position, the radially protruding end of the cam pin abuts against the axially limiting bottom wall, thereby preventing the positioning shaft from dislodging from the shaft hole; in the initial position, the cam member is stopped and limited by the action of the retaining slider entering the fastening position, and by the contact engagement between the limiting surface on the cam member and the radial surface of the retaining slider; the assembly position is located on the opposite side of the initial position in the retraction operation direction, the retraction operation direction being the direction in which the operating cam member drives the retaining slider to move from the fastening position to the retraction position.

12. The snap-fit ​​fastening structure according to claim 10, characterized in that: The cam body is provided with an elastic locking element, which is formed by bending a metal elastic rod. The elastic locking element includes an elastic locking body and an elastic locking arm. An inset groove is recessed on the axial end face of the cam body, and a insertion hole is located at the bottom of the inset groove. The elastic locking body is elastically locked in the inset groove, and the elastic locking arm corresponds to the edge of the insertion hole. The edge of the protruding pin is provided with a slot. When the protruding pin is inserted into the insertion hole, it will squeeze the elastic locking arm to cause it to elastically deform. After being inserted into place, the elastic locking arm resets and is locked into the slot of the protruding pin, thereby achieving locking.

13. The snap-fit ​​fastening structure according to claim 10, characterized in that: The protruding pin and the insertion hole are interference fit, or are fixed by adhesive bonding.

14. The snap-fit ​​fastening structure according to claim 1, characterized in that: The center of the outer axial end of the positioning shaft is recessed with a screwing tool matching port, thereby forming a tool end.

15. The snap-fit ​​fastening structure according to claim 1, characterized in that: The holding end of the holding slider is a flat end with a planar end face.

16. A lock, characterized in that: The fastening structure according to any one of claims 1 to 15 includes a latch seat, which forms the base of the fastening structure, and the bottom wall of the latch seat has a protrusion at one or both ends, which forms the head.

17. A hinge, characterized in that: The device is equipped with the snap-fit ​​fastening structure according to any one of claims 1 to 15, comprising two hinged hinges, wherein the snap-fit ​​fastening structure is disposed on one or both hinges, and the hinges constitute the base of the snap-fit ​​fastening structure.

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