Lock catch

Abstract

The utility model discloses a lock catch, and relates to the technical field of locking devices, the lock catch comprises a base, a buckling piece and a connecting piece, the end part of the buckling piece is provided with a bending part, one side of the connecting piece is connected with the base, the other side of the connecting piece is connected with the buckling piece, the base is rotatably connected with the buckling piece through the connecting piece, and the buckling piece is connected with the connecting piece. The connecting piece is sleeved with a torsional spring, one end of the torsional spring abuts against the base, the other end of the torsional spring abuts against the buckling piece, the buckling piece rotates and resets through the torsional spring, the torsional spring is arranged on the connecting piece of the lock catch, the buckling piece can automatically reset through the torsional spring after being stressed to rotate and disengage from a clamping groove of a box body, and the lock catch is easy to use and saves labor; the user experience is improved, unlocking and resetting of the lock catch can be completed only by pressing the buckling piece by a user, the lock catch has an automatic resetting function by additionally arranging the torsional spring, and the use convenience is improved.

Description

Technical Field

[0001] This application relates to the field of locking device technology, and more specifically to a latch. Background Technology

[0002] Toolboxes, suitcases, and waterproof cases on the market typically consist of a body and a lid. The lid is hinged to the body to allow it to rotate and open or close. Once closed, the lid needs to be locked to ensure the safety and stability of the case. Currently, this is often achieved by installing a latch between the body and the lid. The latch can be optionally located on the body or a corresponding slot on the lid, or vice versa. When locking, the end of the latch needs to be engaged with the slot so that the lid is locked to the body when closed, preventing the loss or damage of internal items due to accidental opening of the lid.

[0003] For example, utility model patent CN210307754U discloses a toolbox locking device, including a mounting base made of metal material fixedly installed on the toolbox body. The mounting base is close to the toolbox lid, and a latch is hinged to the mounting base via a metal shaft. The end of the latch has a snap-fit ​​bend, and the lid has a flange adapted to the snap-fit ​​bend. The metal shaft includes a hinge portion rotatably mounted on the mounting base, and extension portions connecting the latch are respectively provided on both sides of the hinge portion. The extension portions are perpendicular to the hinge portion, and the ends of the extension portions are rotatably mounted on the latch. In this technical solution, the mounting base and latch made of metal material, as well as the metal shaft hinge, improve the structural strength and durability of the lock and extend its service life. However, this type of lock requires manual lifting to unlock, causing the end of the lock to disengage from the slot, making unlocking laborious, cumbersome, and inconvenient, thus affecting the user experience. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a latch with a torsion spring on the connecting part. After the latching part is rotated under force and disengaged from the slot of the box, it can be automatically reset by the torsion spring, which is simple and labor-saving to use and improves the user experience.

[0005] This application provides a latch, including a base, a fastening member, and a connecting member. The fastening member has a bent portion at one end. One side of the connecting member is connected to the base, and the other side of the connecting member is connected to the fastening member. The base and the fastening member are rotatably connected via the connecting member. A torsion spring is fitted on the connecting member. One end of the torsion spring abuts against the base, and the other end of the torsion spring abuts against the fastening member. The fastening member is reset by rotating the torsion spring. In this technical solution, the latch is mainly used to close and lock the box body and the box lid. The latch can be installed on the box body, with a corresponding slot on the box lid, or the latch can be installed on the box lid, with a corresponding slot on the box body. The latch is fixed to the box body or box lid by a base. By providing a bent part on the latch's fastening component, the fastening component can engage with the corresponding slot on the box lid or box body through the bent part, thereby closing and locking the box body and box lid. The bent part design can improve the tightness of the fastening and reduce the risk of accidental opening. The base and the fastening component are rotatably connected by a connector. The fastening component can engage or disengage with the corresponding slot on the box lid or box body by rotating. The upper part is fitted with a torsion spring. After the fastener rotates under force and disengages from the slot on the box, it automatically returns to its initial position under the force of the torsion spring, eliminating the need for manual reset by the user. This makes operation simpler and less strenuous. When the lock needs to be unlocked, the user presses the end of the fastener away from the bend. The fastener rotates relative to the base via the connector, causing the bend to disengage from the corresponding slot on the lid or box. When the user releases their hand, the fastener automatically rotates and resets under the action of the torsion spring. The user only needs to press the fastener to unlock and reset the lock. The addition of the torsion spring gives the lock an automatic reset function, improving ease of use and eliminating the need for manual reset.

[0006] As an improvement, the other end of the torsion spring is provided with a first extension that abuts against the fastening member. The fastening member is provided with a receiving groove adapted to the first extension, and the first extension is confined within the receiving groove. In this technical solution, a first extension is provided at the end where the torsion spring mates with the fastening member. The torsion spring abuts against the fastening member through the first extension, ensuring that the force of the torsion spring can be effectively transmitted to the fastening member. A receiving groove is provided on the fastening member to accommodate the first extension, making the abutment between the torsion spring and the fastening member tighter and more reliable, preventing the torsion spring from disengaging from the fastening member, and enhancing the structural stability of the entire latch.

[0007] As an improvement, the receiving groove extends along the length of the fastener, and the first extension is movably connected to the receiving groove. When the fastener is rotated under force, the first extension moves within the receiving groove to avoid the rotation of the fastener. In this technical solution, a receiving groove is provided that extends along the length direction of the fastening member. This design allows the fastening member to have a certain amount of room for movement in the length direction, and the first extension is movably connected to the receiving groove. This connection method provides a certain degree of flexibility, allowing the first extension to move within the receiving groove along the length direction of the fastening member. When the fastening member is rotated under force, the first extension can move within the receiving groove due to the rotational force of the receiving groove, thereby preventing the first extension from getting stuck with the receiving groove and interfering with the rotation of the fastening member. The torsion spring has deformation space by moving within the receiving groove through the first extension. Even if the torsion spring is deformed or the force is uneven, it can still adapt to the fastening member, improving the flexibility of use and allowing the latch to adapt to different operating angles and forces. The movement of the first extension within the receiving groove avoids the rotation of the fastening member, reducing interference between the first extension and the fastening member, thereby reducing the risk of wear and jamming and extending the service life of the latch.

[0008] As an improvement, the receiving groove is provided with an opening, and the fastening member is provided with a stop for closing the opening. In this technical solution, an opening is provided in the receiving groove for assembling the first extension. By providing a stop at the opening of the receiving groove, the opening of the receiving groove is closed after the first extension is installed in place, ensuring that the first extension cannot disengage from the receiving groove during normal use, thereby improving the stability and reliability of use. On the other hand, there is a gap between the end of the receiving groove with the opening and the stop. This gap allows for a certain elastic deformation space between the receiving groove and the stop, thereby better adapting to the assembly and disassembly of the first extension. Furthermore, this gap allows for fine-tuning during assembly to ensure that the first extension is correctly installed in the receiving groove. The stop is provided with a protrusion facing the receiving groove, which is located within the aforementioned gap, thereby better sealing the opening and improving the stability and reliability of use.

[0009] As an improvement, the fasteners, connectors, and torsion springs are arranged in a triangular pattern. In this technical solution, the triangular layout ensures that the forces acting on the fasteners are evenly distributed among the fasteners, connectors, and torsion springs, reducing excessive stress on individual components and minimizing localized stress concentration, thereby improving the overall structural durability and stability.

[0010] As an improvement, the stroke angle of the torsion spring is 20-60 degrees. In this technical solution, by limiting the stroke angle of the torsion spring, the force on the fastener during rotation can be precisely controlled, ensuring that the force is applied within the designed safe range, preventing damage to the fastener due to excessive force, thereby protecting the entire latch and extending the service life of the torsion spring and the fastener. On the other hand, by setting the stroke angle of the torsion spring to 20-60 degrees, the torsion spring can quickly respond to the rotation of the fastener and provide timely reset force.

[0011] As an improvement, the connector includes a first rotating shaft, a second rotating shaft, and a connecting rod. The first and second rotating shafts are connected by the connecting rod. The connector is rotatably connected to the base via the first rotating shaft, and rotatably connected to the fastener via the second rotating shaft. The torsion spring is fitted onto the first rotating shaft. In this technical solution, a first and second rotating shaft are provided on the connector. The first rotating shaft is rotatably connected to the base, and the second rotating shaft is rotatably connected to the fastener. This allows the connector to be rotatably connected to both the base and the fastener simultaneously. The dual-shaft design provides greater flexibility and freedom, allowing the fastener to rotate in multiple directions. The first and second rotating shafts are connected by the connecting rod, and the first rotating shaft, second rotating shaft, and connecting rod are integrally formed. The connecting rod can transmit force and maintain the stability of the structure.

[0012] As an improvement, the base is provided with a first mounting seat adapted to the first rotating shaft, and the first rotating shaft is rotatably connected to the first mounting seat. The fastening member is provided with a second mounting seat adapted to the second rotating shaft, and the second rotating shaft is rotatably connected to the second mounting seat. In this technical solution, the base is rotatably connected to the first rotating shaft through the first mounting seat, and the fastening member is rotatably connected to the second rotating shaft through the second mounting seat. This improves the assembly accuracy and reliability. The rotatable connection allows the connecting member to rotate freely within a predetermined range, reducing structural deformation caused by improper fixing or uneven stress. The rotatable connection design of each mounting seat on the base and the fastening member to each rotating shaft on the connecting member provides a structurally stable, flexible, and durable locking device. It not only improves the operational performance of the locking device but also optimizes the user experience and ease of use.

[0013] As an improvement, the base is provided with a positioning seat adapted to the connecting rod. The connecting rod can be rotated to elastically engage or disengage from the positioning seat. In this technical solution, by setting a positioning seat on the base, the positioning seat is provided with a U-shaped groove. The positioning seat can elastically engage the connecting rod through the U-shaped groove. When the lock needs to be locked, the user presses the fastening component, causing the connecting component to rotate under the force of the fastening component. When the bent part of the fastening component engages with the corresponding groove on the lid or body, the connecting rod rotates to engage with the positioning seat, making the locking more stable and reliable, preventing the bent part of the fastening component from disengaging from the groove on its own, and improving the locking efficiency. When the lock needs to be unlocked, the user presses the fastening component, the fastening component rotates, causing the bent part to disengage from the corresponding groove on the lid or body, and driving the connecting component to rotate. The connecting component is subjected to force, causing the connecting rod to disengage from the positioning seat. The fastening component automatically resets under the action of the torsion spring. The structural design is ingenious and reliable.

[0014] As an improvement, one end of the torsion spring is provided with a second extension that abuts against the base. A third mounting seat adapted to the second extension is provided on the base. The second extension is connected to the third mounting seat to confine the torsion spring to the base. In this technical solution, the second extension is provided at the end of the torsion spring that mates with the base, allowing the torsion spring to abut against the base, ensuring stable support of the torsion spring by the base. The third mounting seat on the base accommodates the second extension, making the contact between the torsion spring and the base tighter and more reliable, preventing the torsion spring from detaching from the base, reducing unnecessary movement and deformation of the torsion spring during operation, and enhancing the overall structural stability of the latch. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a latch according to this application.

[0016] Figure 2 This is a schematic diagram of the exploded structure of a latch according to this application.

[0017] Figure 3 This is a three-dimensional structural diagram of the connector and torsion spring in this application.

[0018] Figure 4 This is a three-dimensional structural diagram of the fastening component in this application.

[0019] Figure 5 This is a cross-sectional structural diagram of a latch according to this application.

[0020] As shown in the figure: 1. Base; 11. First mounting seat; 12. Positioning seat; 13. Third mounting seat; 2. Fastening element; 21. Bending part; 22. Receiving groove; 23. Stop part; 231. Protrusion; 24. Second mounting seat; 3. Connecting element; 31. First rotating shaft; 32. Second rotating shaft; 33. Connecting rod; 4. Torsion spring; 41. First extension part; 42. Second extension part. Detailed Implementation

[0021] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0022] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0023] It should also be understood that the terms "comprising," "including," "having," "containing," and "including," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (the specific types and constructions may be the same or different), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0024] Furthermore, it should be noted that the terms "installation," "setting," "equipped with," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components; they can refer to a direct installation on another component or the possible presence of another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figures 1 to 5As shown, this application discloses a latch, including a base 1, a fastening member 2, and a connecting member 3. The end of the fastening member 2 is provided with a bent portion 21. The latch is mainly used to close and lock the box body and the box lid. The latch can be installed on the box body and the box lid is provided with a corresponding slot, or the latch can be set on the box lid and the box body is provided with a corresponding slot. The latch is fixed to the box body or the box lid by the base 1. By providing the bent portion 21 on the fastening member 2 of the latch, the fastening member 2 can be latched with the corresponding slot on the box lid or the box body through the bent portion 21, so that the box body and the box lid are closed and locked. The design of the bent portion 21 can improve the tightness of the latch and reduce the risk of accidental opening. One side of the connecting member 3 is connected to the base 1, and the other side of the connecting member 3 is connected to the fastening member 2. The base 1 and the fastening member 2 are rotatably connected by the connecting member 3. The fastening member 2 can be latched or disengaged from the corresponding slot on the box lid or the box body by rotation.

[0026] A torsion spring 4 is fitted onto the connector 3. One end of the torsion spring 4 abuts against the base 1, and the other end abuts against the fastener 2. The fastener 2 is reset by rotating the torsion spring 4. By fitting the torsion spring 4 onto the connector 3, the fastener 2 rotates under force and disengages from the slot in the box. Under the force of the torsion spring 4, the fastener 2 can automatically return to its initial position without the need for manual reset by the user, making operation simpler and less strenuous. When it is necessary to unlock the latch, the user presses the end of the fastener 2 away from the bent part 21. The fastener 2 rotates relative to the base 1 through the connector 3, thereby disengaging the bent part 21 from the corresponding slot on the lid or box body. When the user releases the hand, the fastener 2 can automatically rotate and reset under the action of the torsion spring 4. The user only needs to press the fastener 2 to complete the unlocking and reset of the latch. The addition of the torsion spring 4 enables the latch to have an automatic reset function, improving the convenience of use. The user does not need to manually reset the latch, thus improving the ease of operation.

[0027] More specifically, such as Figures 2 to 5 As shown, the other end of the torsion spring 4 is provided with a first extension 41 that abuts against the fastening member 2. The fastening member 2 is provided with a receiving groove 22 that is adapted to the first extension 41. The first extension 41 is limited to the receiving groove 22. The first extension 41 is provided at the end where the torsion spring 4 and the fastening member 2 cooperate. The torsion spring 4 abuts against the fastening member 2 through the first extension 41, ensuring that the force of the torsion spring 4 can be effectively transmitted to the fastening member 2. The receiving groove 22 is provided on the fastening member 2 to accommodate the first extension 41, so that the abutment between the torsion spring 4 and the fastening member 2 is tighter and more reliable, which can prevent the torsion spring 4 from disengaging from the fastening member 2 and enhance the structural stability of the entire lock.

[0028] More specifically, such as Figure 4 and Figure 5As shown, the receiving groove 22 extends along the length direction of the fastening member 2. The first extension 41 is movably connected to the receiving groove 22. When the fastening member 2 is subjected to force and rotates, the first extension 41 moves within the receiving groove 22 to avoid the rotation of the fastening member 2. The design of the receiving groove 22 extending along the length direction of the fastening member 2 allows the fastening member 2 to have a certain amount of room for movement in the length direction. The movable connection between the first extension 41 and the receiving groove 22 provides a certain degree of flexibility, allowing the first extension 41 to move within the receiving groove 22 along the length direction of the fastening member 2. When the fastening member 2 is subjected to force and rotates, the first extension 41 moves within the receiving groove 22. The first extension 41 is able to move within the receiving groove 22 due to the rotational force of the receiving groove 22, thereby preventing the first extension 41 from getting stuck in the receiving groove 22 and interfering with the rotation of the fastener 2. The torsion spring 4 has deformation space by moving within the receiving groove 22 through the first extension 41. Even if the torsion spring 4 is deformed and the force is uneven, it can still be adapted to the fastener 2, improving the flexibility of use and allowing the latch to adapt to different operating angles and forces. The first extension 41 moves within the receiving groove 22 to avoid the rotation of the fastener 2, reducing the interference between the first extension 41 and the fastener 2, thereby reducing the risk of wear and jamming and extending the service life of the latch.

[0029] More specifically, such as Figure 4 and Figure 5 As shown, the receiving groove 22 is provided with an opening, and the fastener 2 is provided with a stop 23 for closing the opening. The receiving groove 22 is provided with an opening for assembling the first extension 41. By providing the stop 23 at the opening of the receiving groove 22, the opening of the receiving groove 22 is closed after the first extension 41 is installed in place, ensuring that the first extension 41 cannot disengage from the receiving groove 22 during normal use, thereby improving the stability and reliability of use. On the other hand, there is a gap between the end of the receiving groove 22 with the opening and the stop 23. This gap allows for a certain elastic deformation space between the receiving groove 22 and the stop 23, thereby better adapting to the assembly and disassembly of the first extension 41. This gap also allows for fine-tuning during assembly to ensure that the first extension 41 is correctly installed in the receiving groove 22. The stop 23 is provided with a protrusion 231 facing the receiving groove 22. The protrusion 231 is located within the aforementioned gap, thereby better sealing the opening and improving the stability and reliability of use.

[0030] More specifically, such as Figure 1 and Figure 5 As shown, the fastener 2, connector 3 and torsion spring 4 are arranged in a triangle. The triangular layout allows the force on the fastener 2 to be evenly distributed among the fastener 2, connector 3 and torsion spring 4, reducing excessive stress on a single component and reducing local stress concentration, thereby improving the durability and overall structural stability of the structure.

[0031] More specifically, the stroke angle of the torsion spring 4 is 20 degrees to 60 degrees. By limiting the stroke angle of the torsion spring 4, the force on the fastener 2 during rotation can be precisely controlled, ensuring that the force is applied within the designed safe range, preventing the fastener 2 from being damaged due to excessive force, thereby protecting the entire lock and extending the service life of the torsion spring 4 and the fastener 2. On the other hand, by setting the stroke angle of the torsion spring 4 to 20 degrees to 60 degrees, the torsion spring 4 can quickly respond to the rotation of the fastener 2 and provide timely reset force.

[0032] More specifically, such as Figures 2 to 5 As shown, the connector 3 includes a first rotating shaft 31, a second rotating shaft 32, and a connecting rod 33. The first rotating shaft 31 and the second rotating shaft 32 are connected by the connecting rod 33. The connector 3 is rotatably connected to the base 1 via the first rotating shaft 31 and to the fastener 2 via the second rotating shaft 32. A torsion spring 4 is fitted onto the first rotating shaft 31. The first rotating shaft 31 and the second rotating shaft 32 are provided on the connector 3. The first rotating shaft 31 is rotatably connected to the base 1, and the second rotating shaft 32 is rotatably connected to the fastener 2, so that the connector 3 can be rotatably connected to both the base 1 and the fastener 2 at the same time. The dual-shaft design provides greater flexibility and freedom, allowing the fastener 2 to rotate in multiple directions. The first rotating shaft 31 and the second rotating shaft 32 are connected by the connecting rod 33. The first rotating shaft 31, the second rotating shaft 32, and the connecting rod 33 are integrally formed structures. The connecting rod 33 can transmit force and maintain the stability of the structure.

[0033] More specifically, such as Figures 2 to 5 As shown, the base 1 is provided with a first mounting seat 11 adapted to the first rotating shaft 31, and the first rotating shaft 31 is rotatably connected to the first mounting seat 11. The fastening member 2 is provided with a second mounting seat 24 adapted to the second rotating shaft 32, and the second rotating shaft 32 is rotatably connected to the second mounting seat 24. The base 1 is rotatably connected to the first rotating shaft 31 through the first mounting seat 11, and the fastening member 2 is rotatably connected to the second rotating shaft 32 through the second mounting seat 24. This improves the assembly accuracy and reliability. The rotatable connection allows the connecting member 3 to rotate freely within a predetermined range, reducing structural deformation caused by improper fixing or uneven force. The rotatable connection design of each mounting seat on the base 1 and the fastening member 2 with each rotating shaft on the connecting member 3 provides a structurally stable, flexible and durable locking device. It not only improves the operation performance of the locking device, but also optimizes the user experience and ease of use.

[0034] More specifically, such as Figure 2 and Figure 5As shown, a positioning seat 12 adapted to the connecting rod 33 is provided on the base 1. The connecting rod 33 can be elastically engaged or disengaged from the positioning seat 12 by rotation. By providing the positioning seat 12 on the base 1, and the positioning seat 12 having a U-shaped groove, the positioning seat 12 can elastically engage the connecting rod 33 through the U-shaped groove. When the lock needs to be locked, the user presses the fastening part 2, causing the connecting part 3 to rotate under the force of the fastening part 2. The bent part 21 of the fastening part 2 engages with the corresponding locking part on the lid or body of the box. When the latch is engaged, the connecting rod 33 rotates to engage with the positioning seat 12, making the locking more stable and reliable, preventing the bent part 21 of the fastening part 2 from disengaging from the slot on its own, and improving the locking efficiency. When the latch needs to be unlocked, the user presses the fastening part 2, and the fastening part 2 rotates to disengage the bent part 21 from the corresponding slot on the lid or body of the box, and drives the connecting part 3 to rotate. The connecting part 3 is subjected to force to disengage the connecting rod 33 from the positioning seat 12, and the fastening part 2 automatically resets under the action of the torsion spring 4. The structure is ingenious and reliable.

[0035] More specifically, such as Figures 2 to 5 As shown, one end of the torsion spring 4 is provided with a second extension 42 that abuts against the base 1. The base 1 is provided with a third mounting seat 13 that is adapted to the second extension 42. The second extension 42 is connected to the third mounting seat 13 to limit the torsion spring 4 to the base 1. The second extension 42 is provided at the end of the torsion spring 4 that mates with the base 1. The torsion spring 4 abuts against the base 1 through the second extension 42 to ensure that the base 1 can stably support the torsion spring 4. The third mounting seat 13 is provided on the base 1 to accommodate the second extension 42, so that the abutment between the torsion spring 4 and the base 1 is tighter and more reliable, which can prevent the torsion spring 4 from separating from the base 1, reduce unnecessary movement and deformation of the torsion spring 4 during operation, and enhance the structural stability of the entire latch.

[0036] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A latch, comprising a base (1), a fastening member (2), and a connecting member (3), wherein the end of the fastening member (2) is provided with a bent portion (21), characterized in that, One side of the connector (3) is connected to the base (1), and the other side of the connector (3) is connected to the fastener (2). The base (1) and the fastener (2) are rotatably connected through the connector (3). A torsion spring (4) is fitted on the connector (3). One end of the torsion spring (4) abuts against the base (1), and the other end of the torsion spring (4) abuts against the fastener (2). The fastener (2) is reset by rotating the torsion spring (4).

2. The latch according to claim 1, characterized in that, The other end of the torsion spring (4) is provided with a first extension (41) that abuts against the fastener (2). The fastener (2) is provided with a receiving groove (22) that is adapted to the first extension (41). The first extension (41) is limited to the receiving groove (22).

3. A latch according to claim 2, characterized in that, The receiving groove (22) extends along the length direction of the fastener (2), and the first extension (41) is movably connected to the receiving groove (22). When the fastener (2) is rotated under force, the first extension (41) is moved within the receiving groove (22) to avoid the rotation of the fastener (2).

4. A latch according to claim 2, characterized in that, The receiving groove (22) is provided with an opening, and the fastening member (2) is provided with a stop (23) for closing the opening.

5. A latch according to claim 1, characterized in that, The fastener (2), connector (3) and torsion spring (4) are arranged in a triangular pattern.

6. A latch according to claim 1, characterized in that, The stroke angle of the torsion spring (4) is 20 degrees to 60 degrees.

7. A latch according to claim 1, characterized in that, The connecting member (3) includes a first rotating shaft (31), a second rotating shaft (32) and a connecting rod (33). The first rotating shaft (31) and the second rotating shaft (32) are connected by the connecting rod (33). The connecting member (3) is rotatably connected to the base (1) through the first rotating shaft (31). The connecting member (3) is rotatably connected to the fastener (2) through the second rotating shaft (32). The torsion spring (4) is fitted on the first rotating shaft (31).

8. A latch according to claim 7, characterized in that, The base (1) is provided with a first mounting seat (11) adapted to the first rotating shaft (31), and the first rotating shaft (31) is rotatably connected to the first mounting seat (11). The fastening member (2) is provided with a second mounting seat (24) adapted to the second rotating shaft (32), and the second rotating shaft (32) is rotatably connected to the second mounting seat (24).

9. A latch according to claim 7, characterized in that, The base (1) is provided with a positioning seat (12) adapted to the connecting rod (33), and the connecting rod (33) can be rotated to elastically engage or disengage from the positioning seat (12).

10. A latch according to claim 8, characterized in that, One end of the torsion spring (4) is provided with a second extension (42) that abuts against the base (1). The base (1) is provided with a third mounting seat (13) that is adapted to the second extension (42). The second extension (42) is connected to the third mounting seat (13) to limit the torsion spring (4) on the base (1).

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