Folding lock

Abstract

The utility model provides a folding lock which comprises a first lock arm and a second lock arm. The lock cylinder is located on the first lock arm and provided with a lock hole, and a key is inserted into the lock hole to rotate; the lock tongue is connected with the lock liner, and the lock liner is rotated to drive the lock tongue to move on a specified path; the second lock arm is provided with a lock shaft, and the lock shaft is located on a specified path; and when the spring bolt moves towards the direction close to the lock shaft along a specified path until the spring bolt is clamped with the lock shaft, the first lock arm and the second lock arm are locked. The lock tongue can move along a specified path under the condition that the lock cylinder rotates, the first lock arm and the second lock arm are locked when the lock tongue gets close to the direction of the lock shaft and is connected with the lock shaft in a clamped mode, the strength of the folding lock can be improved, and meanwhile the safety of the folding lock is further improved in cooperation with the alarming function of the folding lock.

Description

Technical Field

[0001] The utility model relates to the field of lock structures, in particular to a folding lock. Background Art

[0002] At present, when a bicycle or other large object needs to be locked, a chain is generally used to encircle the object to be locked, and then an independent lock body is used to lock the two ends of the chain, thereby achieving the locking requirement of the large object. However, there is not much connection between the independent lock body and the chain, resulting in low strength of the entire lock, and the lock body is easily damaged and broken, which can easily cause property losses to consumers. Utility Model Content

[0003] The embodiment of the utility model provides a folding lock to solve the problems existing in the related art. The technical solution is as follows:

[0004] In a first aspect, an embodiment of the utility model provides a folding lock, comprising:

[0005] First locking arm;

[0006] A lock core is located on the first lock arm, and has a lock hole for inserting a key and rotating it;

[0007] The lock tongue is connected to the lock cylinder, and the lock cylinder is rotated to drive the lock tongue to move on a specified path;

[0008] The second locking arm is provided with a locking shaft, and the locking shaft is located on a designated path;

[0009] When the lock tongue moves along the designated path toward the lock shaft until the lock tongue is engaged with the lock shaft, the first lock arm and the second lock arm are locked.

[0010] In one embodiment, a thimble is provided on the lock core, and a first slot is provided on the lock tongue opposite to the thimble. The thimble is inserted into the first slot to rotate the lock core to drive the lock tongue to move on a specified path.

[0011] In one embodiment, the first bayonet is formed by opening a hole at the edge of the locking tongue and extending in a direction perpendicular to the designated path, and the opening depth of the first bayonet is greater than the rotation radius of the ejector pin.

[0012] In one embodiment, a radially inwardly sunken journal is provided on the circumference of the lock shaft, and a second bayonet is provided at a position of the lock tongue opposite to the journal, and the first locking arm and the second locking arm are locked by snapping into the journal through the second bayonet.

[0013] In one embodiment, it further includes:

[0014] A plurality of hinged intermediate locking arms are hinged to the first locking arm and the second locking arm. When the first locking arm and the second locking arm are locked, the first locking arm, the intermediate locking arm and the second locking arm form a closed loop.

[0015] In one embodiment, the intermediate locking arm has a first joint end and a second joint end, the first joint end extends outward so that the side area of ​​the first joint end is larger than the side area of ​​the second joint end, the first locking arm or the second locking arm is hinged to the first joint end of one of the intermediate locking arms, and the second joint end of the intermediate locking arm is hinged to the second joint end of the other intermediate locking arm.

[0016] In one embodiment, it further includes:

[0017] A lock housing connected to the first lock arm, the lock housing having a cavity, and the lock core is located in the cavity;

[0018] A first sensing component is provided on the lock core;

[0019] The second sensing component is arranged on the lock housing at a position directly opposite to the first sensing component; when the first sensing component moves relative to the second sensing component, the first sensing component or the second sensing component generates an electrical signal, and the electrical signal is used to determine the open or closed state of the folding lock.

[0020] In one embodiment, the first induction component is a magnetic field transmitting device, and the second induction component is a magnetic field receiving device.

[0021] In one embodiment, it further includes:

[0022] A vibration sensor is provided on the lock housing and is used to generate an alarm signal when a shaking is detected;

[0023] The loudspeaker is arranged on the lock housing and is used for giving an alarm according to the alarm signal.

[0024] In one embodiment, it further includes:

[0025] The power supply is arranged in the lock shell, and is connected to the first sensing component or the second sensing component, and is connected to the vibration sensor and the speaker, and is used to supply power to the first sensing component or the second sensing component, the vibration sensor and the speaker.

[0026] The advantages or beneficial effects of the above technical solution include at least:

[0027] The lock tongue of the utility model is located in a lock shell connected to the first lock arm, and the lock shaft is located on the second lock arm. The lock tongue can move along a specified path when the lock core rotates. When the lock tongue approaches the lock shaft and is engaged with the lock shaft, the first lock arm and the second lock arm are locked, replacing the traditional locking method of chain and independent lock, thereby improving the strength of the folding lock and enhancing the safety of the folding lock.

[0028] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with the utility model and should not be regarded as limiting the scope of the utility model.

[0030] Figure 1 This is a schematic diagram of the appearance of the folding lock of the utility model;

[0031] Figure 2 This is a schematic diagram of the exploded structure of the folding lock of the utility model;

[0032] Figure 3 This is a schematic cross-sectional view of the folding lock of the utility model;

[0033] Figure 4 This is a structural diagram of the folding lock of the utility model (with the lock shell hidden);

[0034] Figure 5 This is a schematic diagram of the structure of the lock tongue and the lock core of the utility model;

[0035] Figure 6 It is a structural schematic diagram of the folding lock of the utility model in a fully unfolded state.

[0036] In the figure: 1. first locking arm; 2. middle locking arm; 3. second locking arm; 4. lock shaft; 41. journal; 5. rivet; 6. lock housing; 7. lock tongue; 71. first bayonet; 72. second bayonet; 8. lock core; 81. ejector pin; 9. magnet; 10. central control circuit board; 11. battery; 12. speaker; 13. limit baffle. DETAILED DESCRIPTION

[0037] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0038] This embodiment provides a folding lock, which has high strength, can realize an alarm function, and has high safety. Figures 1 to 6As shown, the folding lock includes a first locking arm 1 , a middle locking arm 2 , a lock core 8 , a locking tongue 7 and a second locking arm 3 .

[0039] like Figure 2 As shown, the first locking arm 1 is set as a flat long strip structure, one end of the first locking arm 1 is provided with a lock shell 6, and the other end of the first locking arm 1 is hinged to one end of one of the middle locking arms. The lock shell 6 is fixed to the lower side of the first locking arm 1, and the lock shell 6 has a cavity, and the lock core 8 is placed in the cavity. The lock shell 6 can also be wrapped with an outer plastic shell to protect the parts in the lock shell 6.

[0040] A lock hole is provided on the side of the lock core 8 facing the first locking arm 1, and an opening is also provided on the first locking arm 1 facing the lock hole, so that the key can pass through the opening on the first locking arm 1 and be inserted into the lock hole of the lock core 8. At this time, rotating the key can drive the lock core 8 to rotate synchronously.

[0041] The lock core 8 can be rotated by adopting structures such as blade type, digital lock or pin lock. The structures of digital lock and pin lock have been disclosed in the prior art, and the structures of digital lock and pin lock are not described in detail here. It is only necessary that they can be rotated under the action of the key.

[0042] The lock tongue 7 is located in the lock shell 6, and the lock tongue 7 is in contact with the lock core 8. When the lock core 8 is rotated, the lock tongue 7 can be driven to move on a specified path; when the folding lock is in a fully folded state, the position of the lock tongue 7 and the position of the lock shaft 4 on the second lock arm 3 are connected to form a straight line, and the specified path for the movement of the lock tongue 7 is the straight line between the lock tongue 7 and the lock shaft 4. In this embodiment, the lock tongue 7 moves along the specified path, that is, the lock tongue 7 can move horizontally in the direction close to the lock shaft 4, or can move horizontally in the direction away from the lock shaft 4, so as to achieve the effect of mutual engagement or separation of the lock tongue 7 and the lock shaft 4.

[0043] The second locking arm 3 is also configured as a flat long strip structure. A locking shaft 4 is provided at one end of the second locking arm 3 , and the other end of the second locking arm 3 is hinged to one end of the middle locking arm 2 .

[0044] like Figure 6 As shown, the first locking arm 1 and the second locking arm 3 are connected by a plurality of middle locking arms 2 which are hinged end to end, so that the first locking arm 1, the middle locking arm 2 and the second locking arm 3 are hinged in sequence, and the folding lock is in a fully unfolded state. Figure 1 As shown, when all the intermediate locking arms 2 are folded between the first locking arm 1 and the second locking arm 3, the folding lock is in a completely folded state. In this state, the height to which all the intermediate locking arms 2 are folded is consistent with the height of the lock housing 6, so that the lock shaft 4 on the second locking arm 3 is located beside the lock tongue 7, so that the lock tongue 7 moves to the position of the lock shaft 4 and engages with the lock shaft 4.

[0045] When the folding lock is in the fully folded state, the key inserted into the lock core 8 is rotated to drive the lock tongue 7 to move along a specified path toward the lock shaft 4 until the lock tongue 7 is engaged with the lock shaft 4, and the first lock arm 1 and the second lock arm 3 are locked. At this time, the key is rotated in the opposite direction, and the lock core 8 drives the lock tongue 7 to move along a specified path away from the lock shaft 4. When the lock tongue 7 and the lock shaft 4 are no longer engaged, the first lock arm 1 and the second lock arm 3 are completely unlocked.

[0046] like Figure 5 As shown, the lock tongue 7 matches the ejector pin 81 provided on the lock core 8 to achieve the moving effect of the lock tongue 7. The ejector pin 81 can be provided at the bottom end of the lock core 8. The ejector pin 81 is a raised cylindrical structure. A space for accommodating and moving the lock tongue 7 is provided at a position directly opposite to the ejector pin 81 in the lock shell 6. The lock tongue 7 is placed in the space to limit the position of the lock tongue 7 in the lock shell 6 and improve stability. The lock tongue 7 is provided as a flat sheet structure. A first bayonet 71 is provided at a position directly opposite to the ejector pin 81 of the lock tongue 7. The first bayonet 71 is formed by opening a hole at the edge of the lock tongue 7 and extending in a direction perpendicular to the designated path. The ejector pin 81 is inserted into the first bayonet 71. The opening depth of the first bayonet 71 is greater than the rotation radius of the ejector pin 81, so that when the ejector pin 81 rotates around the lock core 8, it is ensured that the ejector pin 81 can always be limited in the first bayonet 71 and will not fall off.

[0047] A second bayonet 72 is provided on the side of the lock tongue 7 close to the lock shaft 4, and a radially inwardly recessed shaft neck 41 is provided on the circumference of the lock shaft 4, the opening curvature of the second bayonet 72 corresponds to the outer contour curvature of the shaft neck 41, and the second bayonet 72 is directly opposite to the shaft neck 41. When the lock tongue 7 moves toward the lock shaft 4, when the second bayonet 72 is inserted into the shaft neck 41, the second lock arm 3 is clamped by the lock tongue 7 at the lock shaft 4. Therefore, the first lock arm 1 in the fully folded state can be locked with the second lock arm 3 to achieve the locked state of the folding lock.

[0048] like Figure 4 As shown, the moving distance of the lock tongue 7 is limited. When the lock tongue 7 moves toward the lock shaft 4, the rotation angle of the lock core 8 in this direction reaches the maximum when the lock tongue 7 moves to the lock shaft 4 and is engaged with the lock shaft 4. A limit baffle 13 is provided on the side of the lock tongue 7 away from the lock shaft 4 to limit the maximum distance of the lock tongue 7 moving away from the lock shaft 4. Under the action of the lock shaft 4 and the limit baffle 13, the rotation angle of the lock core 8 is limited, and the distance that the lock tongue 7 moves on the specified path is also limited. In this embodiment, the movement of the lock tongue 7 can be approximated as translation. Figure 4 The dashed arrow in the middle indicates that the lock tongue 7 moves toward the lock shaft 4 along the specified path.

[0049] In order to improve the overall strength of the folding lock, the joints of all the lock arms are also strengthened. In this embodiment, each lock arm has a first joint end and a second joint end, and holes are provided on the first joint end and the second joint end for the rivet 5 to be inserted to achieve a hinged effect; wherein, the first joint end extends outward so that the side area of ​​the first joint end is larger than the side area of ​​the second joint end, so as to increase the strength of the connection of the first joint end.

[0050] A plurality of hinged intermediate locking arms 2 are hinged to the first locking arm 1 and the second locking arm 3. When the first locking arm 1 and the second locking arm 3 are locked, the first locking arm 1, the intermediate locking arm 2 and the second locking arm 3 form a closed loop. Figure 2 , Figure 6 As shown, in this embodiment, it is assumed that there are six intermediate lock arms 2, the second joint end of the first lock arm 1 is connected to the lock housing 6, the first joint end thereof is hinged to the first joint end of the first intermediate lock arm, the second joint end of the first intermediate lock arm is hinged to the second joint end of the second intermediate lock arm, the first joint end of the second intermediate lock arm is hinged to the first joint end of the third intermediate lock arm, the second joint end of the third intermediate lock arm is hinged to the second joint end of the fourth intermediate lock arm, and so on, the first joint end of the sixth intermediate lock arm is hinged to the first joint end of the second lock arm 3, and the second joint end of the second lock arm 3 is provided with a lock shaft 4. This embodiment can greatly improve the strength of the joint connection of the folding lock through the lock arm structure and the hinge method, and improve the safety of the folding lock as a whole.

[0051] In order to further improve the safety of the folding lock, an alarm function is added to the folding lock itself. In this embodiment, a first sensing component is provided on the lock core 8, and a second sensing component is provided on the lock shell 6 at a position directly opposite to the first sensing component. When the lock core 8 rotates, it can drive the first sensing component to rotate synchronously, and the second sensing component is fixed in the lock shell 6. When the first sensing component moves relative to the second sensing component, the first sensing component or the second sensing component generates an electrical signal, which is used to reflect the relative displacement between the first sensing component and the second sensing component, determine the rotation state of the lock core 8, and thus judge whether the folding lock is currently in an unlocked or locked state.

[0052] The second induction component corresponds to the first induction component. If the first induction component is used to transmit signals, the second induction component is used to receive signals. The first induction component may be a magnetic field transmitting device, which is used to transmit a magnetic field within a specified range. In order to ensure that the first induction component can operate normally for a long time, the first induction component in this embodiment may be a magnet 9, such as Figure 3As shown, the magnet 9 is arranged on the side of the lock core 8. The magnet 9 can generate a magnetic field of a certain range for a long time without power supply. The second sensing component is a magnetic field receiving device, which is used to sense the magnetic field and generate a corresponding electromagnetic signal. When the magnet 9 rotates with the lock core 8, the second sensing component can recognize the change in the strength of the magnetic field, and thus sense the activity of the lock core 8 according to the size of the received electromagnetic signal, so as to determine whether the folding lock is in the unlocked / locked state.

[0053] In some embodiments, the first sensing component can be a magnetic field receiving device, the second sensing component can be a magnetic field transmitting device, the first sensing component rotates with the rotation of the lock core 8, and the second sensing component is fixed in the lock shell 6; it is only necessary to ensure that the first sensing component and the second sensing component can achieve relative displacement.

[0054] In order to simplify the internal components of the folding lock, this embodiment adopts an induction method in which the first induction component is a magnetic field transmitting device and the second induction component is a magnetic field receiving device, so that the second induction component can be electrically connected to other electronic components inside the lock shell 6.

[0055] A central control circuit board 10 is provided in the lock shell 6. The central control circuit board 10 is placed on the circuit board cover and fixed in the lock shell 6 through the circuit board cover. The central control circuit board 10 is used to collect the electrical signal generated by the first sensing component or the second sensing component, and can also control the vibration sensor and the speaker 12 in the folding lock. Among them, the vibration sensor can be arranged in the lock shell 6, and the vibration sensor is connected to the central control circuit board 10 by wire. The vibration sensor is used to detect whether the folding lock is shaken due to external influences, and an alarm signal is generated if shaking is detected. The speaker 12 is exposed outside the lock shell 6 and can be arranged on the side of the lock shell 6. The speaker 12 is connected to the central control circuit board 10 by wire, and is used to emit an alarm sound according to the alarm signal to realize the alarm function.

[0056] In this embodiment, after receiving the electrical signal collected by the second sensing component, the central control circuit board 10 analyzes whether the lock is currently in an unlocked or locked state based on the strength of the electrical signal, and then controls the switch state of the vibration sensor based on the unlocked / locked state. The vibration sensor is used to determine whether the lock is currently in a damaged state, thereby determining whether the speaker 12 needs to sound an alarm.

[0057] In addition, the lock housing 6 is also equipped with a built-in power supply, which may be a removable battery 11, to provide power to the central control circuit board 10, thereby ensuring that the second sensing component, the vibration sensor, the speaker 12 and other devices can operate normally.

[0058] In this embodiment, when the second sensing component detects that the magnetic field signal emitted by the first sensing component is weak, it means that the distance between the first sensing component and the second sensing component is relatively large, and the folding lock can be determined to be in an unlocked state; when the second sensing component detects that the magnetic field signal emitted by the first sensing component is strong, it means that the distance between the first sensing component and the second sensing component is relatively small, and the folding lock can be determined to be in a locked state. After the central control circuit board 10 learns that the folding lock is in a locked state according to the electrical signal fed back by the second sensing component, it controls the speaker 12 to emit a "beep" prompt sound to inform the user that the folding lock is currently locked, and controls the folding lock to be in an alarm mode. At this time, the vibration sensor is controlled to be turned on to identify whether the folding lock is damaged. If the vibration sensor detects a continuous shaking signal, the central control circuit board 10 will control the continuous shaking signal to send an alarm signal, and the speaker 12 will continue to send a loud alarm sound according to the alarm signal.

[0059] If the user wants to turn off the alarm sound, the user needs to use the key to rotate the lock cylinder 8 to unlock the folding lock and then quickly rotate the lock cylinder 8 to lock the folding lock. The unlocking and locking actions of the folding lock can be identified through the cooperation of the first sensing component and the second sensing component. At this time, the central control circuit board 10 controls the speaker 12 to emit two "di" prompt sounds according to the electrical signal feedback from the second sensing component to inform the user that the folding lock has currently exited the alarm mode and no longer emits an alarm sound until the folding lock is locked again. After re-entering the alarm mode, the folding lock can continue to be alarmed.

[0060] The alarm principle steps of the above folding lock are as follows:

[0061] Step S1: obtaining a first signal, where the first signal is generated by a sensing component on the folding lock, and the sensing component is used to detect the moving distance of the lock tongue 7 on a specified path;

[0062] Step S2: controlling the folding lock to enter or exit the alarm mode according to the first signal;

[0063] Step S3: when the folding lock enters the alarm mode, obtaining a second signal, where the second signal is generated by a sensor component on the folding lock;

[0064] Step S4: generating a corresponding alarm signal according to the second signal to control the folding lock to perform a corresponding alarm operation.

[0065] Taking the above-mentioned folding lock as an example, the first signal can be generated by the first sensing component or the second sensing component installed on the folding lock. Specifically: the first sensing component is installed on the lock core 8, and is used to emit a magnetic field; the second sensing component is installed in the lock shell 6, and is used to receive the magnetic field and generate a corresponding first signal. According to the strength of the first signal, it can be determined whether the folding lock is in a locked or closed state.

[0066] In some embodiments, the first signal can also be obtained by a laser sensor. A laser emitting end and a laser receiving end are provided above and below the lock tongue 7. When the lock tongue 7 is separated from the lock core 8, the laser emitted by the laser emitting end is not blocked by the lock tongue 7. At this time, the laser receiving end receives the laser and generates a high level; when the lock tongue 7 and the lock core 8 are engaged, the laser emitted by the laser emitting end is blocked by the lock tongue 7. At this time, the laser receiving end cannot receive the laser and generates a low level. At this time, the first signal can be generated to determine that the first locking arm 1 and the second locking arm 3 are locked. The moving distance of the lock tongue 7 on the specified path can also be detected by other methods to determine whether the folding lock is currently in a locked or closed state.

[0067] When the folding lock is in a locked state, the folding lock is controlled to enter an alarm mode, and if the folding lock is in an unlocked state, the folding lock exits the alarm mode.

[0068] When the folding lock is in the locked state, the sensor component on the folding lock is controlled to be turned on, so as to identify whether the folding lock is currently damaged. Taking the folding lock described in the above embodiment as an example, the sensor component can be a vibration sensor. When the folding lock is in the locked state, the vibration sensor is controlled to be turned on, and the vibration / shaking state of the folding lock is detected to determine whether the folding lock is currently damaged.

[0069] When the vibration sensor detects a vibration condition that lasts for a preset long time, a second signal is generated, and the speaker 12 in the folding lock is controlled to perform a corresponding alarm operation, emitting a high-decibel and long-lasting alarm sound.

[0070] The lock tongue 7 is located in a lock shell 6 connected to the first lock arm 1, and the lock shaft 4 is located on the second lock arm 3. The lock tongue 7 can move along a specified path when the lock core 8 rotates. When the lock tongue 7 approaches the lock shaft 4 and engages with the lock shaft 4, the first lock arm 1 and the second lock arm 3 are locked, replacing the traditional chain and independent lock locking method, thereby improving the strength of the folding lock and enhancing the safety of the folding lock.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0073] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A folding lock, characterized in that: include: First locking arm; A lock core, located on the first lock arm, the lock core having a lock hole, the lock hole being used for inserting a key and rotating; A lock tongue connected to the lock core, wherein the lock core is rotated to drive the lock tongue to move along a specified path; A second locking arm is provided with a locking shaft, wherein the locking shaft is located on the designated path; When the lock tongue moves along the designated path toward the lock shaft until the lock tongue is engaged with the lock shaft, the first lock arm and the second lock arm are locked.

2. The folding lock according to claim 1, characterized in that: The lock core is provided with an ejector pin, and the lock tongue is provided with a first slot opposite to the ejector pin. The ejector pin is inserted into the first slot to rotate the lock core to drive the lock tongue to move on the designated path.

3. The folding lock according to claim 2, characterized in that: The first bayonet is formed by opening a hole at the edge of the locking tongue and extending in a direction perpendicular to the designated path. The opening depth of the first bayonet is greater than the rotation radius of the ejector pin.

4. The folding lock according to claim 2, characterized in that: A radially inwardly sunken journal is provided on the circumference of the lock shaft, and a second bayonet is provided at a position of the lock tongue directly opposite the journal. The first locking arm and the second locking arm are locked by snapping the second bayonet into the journal.

5. The folding lock according to claim 1, characterized in that: Also includes: A plurality of hinged intermediate locking arms are hinged to the first locking arm and the second locking arm. When the first locking arm and the second locking arm are locked, the first locking arm, the intermediate locking arm and the second locking arm form a closed loop.

6. The folding lock according to claim 5, characterized in that: The intermediate locking arm has a first joint end and a second joint end. The first joint end extends outward so that the side area of ​​the first joint end is larger than the side area of ​​the second joint end. The first locking arm or the second locking arm is hinged to the first joint end of one of the intermediate locking arms, and the second joint end of the intermediate locking arm is hinged to the second joint end of the other intermediate locking arm.

7. The folding lock according to claim 1, characterized in that: Also includes: A lock housing connected to the first lock arm, the lock housing having a cavity, and the lock core is located in the cavity; A first sensing component is provided on the lock core; The second sensing component is arranged on the lock housing at a position directly opposite to the first sensing component; when the first sensing component moves relative to the second sensing component, the first sensing component or the second sensing component generates an electrical signal, and the electrical signal is used to determine the open or closed state of the folding lock.

8. The folding lock according to claim 7, characterized in that: The first sensing component is a magnetic field transmitting device, and the second sensing component is a magnetic field receiving device.

9. The folding lock according to claim 7, characterized in that: Also includes: A vibration sensor, provided on the lock housing, for generating an alarm signal when shaking is detected; A loudspeaker is arranged on the lock housing and is used for giving an alarm according to the alarm signal.

10. The folding lock according to claim 9, characterized in that: Also includes: A power supply is arranged in the lock housing, and the power supply is connected to the first sensing component or the second sensing component, and is connected to the vibration sensor and the speaker, and is used to supply power to the first sensing component or the second sensing component, the vibration sensor, and the speaker.

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