NFC near field power supply unlocking U-shaped lock

Abstract

The utility model relates to a U -shaped lock of NFC near field power supply unlocking, including lock body and U -shaped lock beam, be provided with button, rotating part, cam block and two lock tongue in the lock body, the both ends of U -shaped lock beam are provided with the locking groove of being suitable for the lock tongue, button and rotating part linkage cooperation and drive rotating part rotation, cam block sets up on rotating part and is located between two lock tongues, the circumferential surface of cam block respectively with the inner end of two lock tongues is opposite, still be provided with blocking piece, drive mechanism and NFC induction assembly in the lock body, NFC induction assembly sets up in the lock body and is electrically connected with drive mechanism, drive mechanism and blocking piece transmission connection and drive blocking piece to move in the lock body, and blocking piece and the retraction path of lock tongue are opposite.

Description

Technical Field

[0001] This utility model relates to a U-shaped lock, specifically a U-shaped lock that uses NFC near-field power supply for unlocking. Background Technology

[0002] U-shaped locks, a common type of anti-theft lock, are widely used for locking bicycles, electric bikes, motorcycles, and other vehicles. They mainly consist of a lock body and a U-shaped locking beam, with the U-shaped beam inserted into the lock body to achieve the locking function. Most U-shaped locks on the market currently use a traditional key-unlocking structure, with a lock cylinder and bolt inside the lock body. Turning the key to the lock cylinder moves the bolt, thus locking and unlocking the bolt. Some U-shaped locks also use a password unlocking or button unlocking structure, where entering the correct password or pressing the unlock button activates the internal bolt to complete the unlocking. In recent years, with the popularization of NFC (Near Field Communication) technology, locks using NFC near-field power supply for unlocking have emerged. These locks utilize the near-field communication signals from devices such as mobile phones to provide power, eliminating the need for an internal battery for electronic unlocking. This is convenient and avoids problems such as battery leakage and replacement.

[0003] However, the existing U-locks still have many shortcomings in practical use: key-type U-locks require carrying the key, which poses a risk of loss, forgetting, or duplication, resulting in poor convenience; password-type U-locks pose security risks such as forgotten passwords or theft by others; and existing NFC near-field power-operated unlocking locks have limited output power from the transmitters such as mobile phones, resulting in weak driving force from the induced current. If the NFC power directly drives the bolt and other actuators to complete the unlocking action, there are often problems with insufficient driving force and unreliable unlocking. They are only suitable for small locks with small bolts and weak locking force, and cannot meet the needs of anti-theft locks such as U-locks that require greater locking force. If the driving force is increased by enlarging the NFC induction coil or adding energy storage capacitors, it will significantly increase the size and cost of the lock, and the unlocking response speed will be slow, resulting in a poor user experience. How to ensure sufficient locking force and anti-theft performance while reliably unlocking under the condition of limited NFC near-field power supply has become a technical problem that urgently needs to be solved in the field of NFC unlocking U-locks. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a U-shaped lock with NFC near-field power supply for unlocking.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a lock body and a U-shaped lock beam. The lock body is equipped with a button, a rotating component, a cam block, and two latches. The two ends of the U-shaped lock beam are provided with locking grooves adapted to the latches. The button and the rotating component work together to drive the rotating component to rotate. The cam block is located on the rotating component and between the two latches. The circumferential surface of the cam block abuts against the inner ends of the two latches. The lock body also includes a blocking component, a driving mechanism, and an NFC sensing component. The NFC sensing component is located within the lock body and electrically connected to the driving mechanism. The driving mechanism is connected to the blocking component and drives the blocking component to move within the lock body. The blocking component's path is opposite to the latches' retraction path.

[0006] By adopting the above technical solution, in the locked state, the blocking component is located on the retraction path of the bolt, preventing the bolt from retracting inward. The cam block is restricted by the bolt and cannot rotate, and the button cannot be pressed, resulting in a mechanically locked state throughout the entire chain. When a device such as a mobile phone with NFC functionality approaches the lock body, the NFC sensing component senses the near-field communication signal and generates an induced current. The drive mechanism, powered by the induced current, drives the blocking component to move, causing it to move away from the retraction path of the bolt. At this time, pressing the button causes the rotating component to rotate, which in turn drives the cam block to rotate synchronously. The cam block drives both bolts to retract inward, disengaging the bolts from the locking slots of the U-shaped lock beam, thus unlocking the lock. After releasing the button, the bolts extend outward again and engage with the locking slots, restoring the U-shaped lock beam to the locked state. This unlocking method, which combines NFC near-field power supply with manual operation, only requires the NFC sensing power supply to drive the blocking component to move. The NFC unlocking method, which uses a short-stroke, low-load blocking component, requires far less driving force than directly driving the bolt to unlock. This effectively solves the technical problem of limited NFC near-field power output, which prevents it from directly driving high-force locks. This allows NFC unlocking to be applied to U-locks and other anti-theft locks requiring high locking force. Manual unlocking via a button on the bolt provides the main unlocking force, fully utilizing the high power output of human hands to ensure reliable and powerful unlocking. NFC power is only responsible for "unlocking authorization," while human intervention is responsible for "unlocking execution." This clear division of labor and clever coordination retains the convenience of NFC's keyless and battery-free features while ensuring sufficient locking force and anti-theft performance, significantly improving the applicability and reliability of NFC-unlocked locks. The absence of a traditional keyhole structure effectively prevents technical unlocking and forced entry, providing excellent anti-theft performance.

[0007] The present invention is further configured such that: the driving mechanism includes a motor, a gear set and a rotating rod; the motor is electrically connected to the NFC sensing component; the gear set is connected between the output shaft of the motor and the rotating rod and drives the rotating rod to rotate; the rotating rod is provided with a radial protrusion; a blocking member is slidably sleeved on the rotating rod; a helical spring is also sleeved on the rotating rod; the end of the radial protrusion extends into the space between adjacent turns of the helical spring; when the rotating rod rotates, the radial protrusion moves along the helical direction of the helical spring and changes the compression of the helical spring.

[0008] By adopting the above technical solution, the induced current generated by the NFC sensing component drives the motor to rotate. The motor's output shaft drives the rotating rod to rotate through a gear set. The radial protrusion on the rotating rod rotates together with the rotating rod. Since the end of the radial protrusion extends between adjacent coils of the helical spring, the protrusion moves relative to the helical spring along the helical direction during rotation, causing the compression of the helical spring between the protrusion and the blocking member to change. When the rotating rod rotates in the forward direction, the protrusion spirals upward along the helical direction, increasing the compression at the upper end of the helical spring and increasing the spring's pushing force on the blocking member, pushing the blocking member upward to the retraction path of the latch. When the rotating rod rotates in the reverse direction, the protrusion spirals downward along the helical direction. As the spring compresses, the blocking component moves downward under its own weight and the spring's restoring force, moving away from the retraction path of the latch. The use of a helical spring and a radial protrusion to achieve elastic screw transmission converts rotational motion into linear movement of the blocking component. This design is simple, ingenious, and cost-effective. The spring transmission provides elastic buffering, absorbing impacts and vibrations and preventing damage to parts from rigid collisions. Simultaneously, the helical spring itself serves both transmission and energy storage functions, eliminating the need for an additional reset elastic component and making the overall structure more compact. The gear set achieves speed reduction and force amplification, enabling the motor to output sufficient thrust to drive the blocking component with a smaller torque, thus reducing the power requirements of the motor.

[0009] The present invention is further configured such that: the gear set includes a first gear and a second gear, the motor drives the first gear to rotate, the first gear meshes with the second gear, the second gear is disposed on the rotating rod, and the rotating rod is parallel to the motor.

[0010] By adopting the above technical solution, the rotating rod and the motor are arranged in parallel, making the drive mechanism as a whole flat and conducive to the internal space layout of the lock body; the single-stage gear transmission structure is simple, has high transmission efficiency and low failure rate; the gear ratio between the first gear and the second gear is used to reduce speed and increase force, ensuring that the rotating rod outputs sufficient torque to drive the blocking part to move; the parallel shaft arrangement makes the drive mechanism compact and occupies little space, which is convenient for installation and arrangement inside the lock body.

[0011] The present invention is further configured as follows: two vertical blocks are provided in the lock body, the two vertical blocks are respectively located on both sides of the rotating component and are arranged opposite to each other, and a ball is provided on the opposite surface of the two vertical blocks. A spirally rising groove is provided on the outer circumferential surface of the rotating component, the ball is embedded in the groove and slides in the groove, the button is connected to the upper end of the two vertical blocks and drives the vertical blocks to move vertically, and when the vertical blocks move down, the ball slides along the groove and drives the rotating component to rotate.

[0012] By adopting the above technical solution, when the button is pressed, the button drives two vertical blocks to move downwards synchronously, and the ball on the vertical block moves downwards accordingly. Since the ball is embedded in the spiral rising groove of the rotating component, the ball slides along the spiral trajectory of the groove during the vertical movement, thereby generating a circumferential thrust on the side wall of the groove, driving the rotating component to rotate around its own axis. The rotating component drives the cam block to rotate synchronously, realizing the retraction of the latch. After the button is released, the vertical block moves upwards under the action of the reset force, the ball slides in the opposite direction along the groove, driving the rotating component to rotate in the opposite direction, and the latch extends again. The transmission structure of vertical block + ball + spiral groove converts the vertical linear motion of the button into the rotational motion of the rotating component. The structure is ingenious and the transmission is smooth. The cooperation between the ball and the groove is rolling friction, with low friction and light operation. The symmetrical arrangement of vertical blocks and balls on both sides makes the rotating component evenly stressed, and the rotation process is stable without unbalanced load. It effectively avoids the jamming phenomenon that may occur with unilateral drive, and improves the reliability of the unlocking action and the operation feel.

[0013] The present invention is further configured such that: a return spring is provided between the button and the lock body, the upper end of the return spring abutting against the button and the lower end abutting against the lock body.

[0014] By adopting the above technical solution, when the button is pressed, the return spring is compressed and stores elastic potential energy; after the button is released, the return spring releases the elastic potential energy, pushing the button upward to return it to its initial position. The button drives the vertical block to move upward, and then through the cooperation of the ball and the spiral groove, it drives the rotating part to rotate in the opposite direction, so that the cam block rotates back to the position where the short axis faces the lock tongue line. Under the action of the fixed spring, the lock tongue extends outward and re-engages into the locking groove of the U-shaped lock beam to achieve locking. The setting of the return spring allows the button to automatically reset after being released, without the need for manual backing, making operation simple and quick; at the same time, it ensures that the button is always in the pop-up position when there is no external force pressing, and the lock always remains in the locked state, avoiding accidental unlocking due to misoperation, and ensuring high safety; the spring return structure is simple, reliable, and has a long service life.

[0015] The present invention is further configured such that: the locking tongue includes a first locking tongue and a second locking tongue, the first locking tongue is located on the left side of the cam block and has a first extension extending to the right side of the cam block, the second locking tongue is located on the right side of the cam block and has a second extension extending to the left side of the cam block, the cam block is located between the first extension and the second extension, and a fixing spring is provided between the first locking tongue and the second locking tongue to drive the first locking tongue and the second locking tongue to move to both sides.

[0016] By adopting the above technical solution, when the cam block rotates to the direction of the short axis facing the line connecting the two latches, the pushing force of the cam block on the extension part decreases, and the elastic restoring force of the fixed spring drives the first and second latches to move to both sides. The latches extend and engage in the locking groove to achieve locking. The first and second latches adopt a plug-in extension structure, and the cam block is set between the two extension parts. Only one cam block can drive the extension and retraction of the two latches at the same time, which is simple and compact. The plug-in structure ensures the coaxiality and motion synchronization of the two latches, so that the extension and retraction of the latches on both sides are consistent, and the locking and unlocking are more stable and reliable. The fixed spring is set between the two latches to provide the driving force for the two latches to extend outward at the same time, ensuring that the latches always remain in the extended state when locked, and the locking is stable and reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the lock body according to this utility model; Figure 3 This is an exploded view of the lock body of this utility model.

[0018] In the diagram: 1. Lock body; 2. U-shaped lock beam; 21. Locking groove; 3. Button; 31. Vertical block; 311. Ball; 32. Return spring; 4. Rotating component; 41. Cam block; 42. Groove; 5. Lock tongue; 51. First lock tongue; 511. First extension; 52. Second lock tongue; 521. Second extension; 53. Fixed spring; 6. Blocking component; 7. Drive mechanism; 71. Motor; 72. Gear set; 721. First gear; 722. Second gear; 73. Rotating rod; 731. Radial protrusion; 74. Helical spring; 8. NFC sensing component. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figure 1-3As shown, this utility model discloses a U-shaped lock with NFC near-field power supply for unlocking, including a lock body 1 and a U-shaped lock beam 2. The lock body 1 contains a button 3, a rotating component 4, a cam block 41, and two latches 5. The two ends of the U-shaped lock beam 2 are provided with locking grooves 21 that fit the latches 5. The button 3 is linked to and drives the rotating component 4 to rotate. The cam block 41 is disposed on the rotating component 4 and located between the two latches 5. The circumferential surface of the cam block 41 abuts against the inner ends of the two latches 5. The lock body 1 also contains a blocking component 6, a driving mechanism 7, and an NFC sensing component 8. The NFC sensing component 8 is disposed within the lock body 1 and works in conjunction with the driving mechanism 7. Electrically connected, the drive mechanism 7 is driven by the blocking member 6, which moves within the lock body 1. The blocking member 6 is opposite to the retraction path of the bolt 5. In the locked state, the blocking member 6 is positioned on the retraction path of the bolt 5, preventing the bolt 5 from retracting inward. The cam block 41 is restricted from rotating by the bolt 5, and the button 3 cannot be pressed, resulting in a mechanically locked state throughout the entire chain. When a device such as a mobile phone with NFC functionality approaches the lock body 1, the NFC sensing component 8 senses the near-field communication signal and generates an induced current. The drive mechanism 7, powered by the induced current, drives the blocking member 6 to move, causing it to move away from the retraction path of the bolt 5. At this time, pressing the button 3 activates the NFC sensor. The rotating component 4 rotates, causing the cam block 41 to rotate synchronously. The cam block 41 drives the two locking tongues 5 to retract inward, and the locking tongues 5 exit from the locking groove 21 of the U-shaped lock beam 2, thus unlocking. After releasing the button 3, the locking tongues 5 extend outward again and lock into the locking groove 21, and the U-shaped lock beam 2 returns to the locked state. The unlocking method adopts a combination of NFC near-field power supply and manual operation. NFC inductive power supply only needs to drive the blocking component 6 to move to release the lock. The blocking component 6 has a short stroke and small load, and the required driving force is much less than the force required to directly drive the locking tongue 5 to unlock. This effectively solves the technical difficulty of the limited output power of NFC near-field power supply and its inability to directly drive high-force locks. This design enables NFC unlocking to be applied to anti-theft locks such as U-locks that require high locking force. Human intervention via button 3 drives the bolt 5 to perform the retractable unlocking action, providing the main unlocking force and fully utilizing the high power output of human intervention to ensure a reliable and powerful unlocking action. NFC power is only responsible for "unlocking authorization," while human intervention is responsible for "unlocking execution." The clear division of labor and ingenious cooperation between the two retain the convenience of NFC's keyless and battery-free features while ensuring sufficient locking force and anti-theft performance, significantly improving the applicability and reliability of NFC-unlocked locks. The absence of a traditional keyhole structure effectively prevents technical unlocking and forced entry, providing excellent anti-theft performance.

[0022] The drive mechanism 7 includes a motor 71, a gear set 72, and a rotating rod 73. The motor 71 is electrically connected to the NFC sensing component 8. The gear set 72 is connected between the output shaft of the motor 71 and the rotating rod 73, driving the rotating rod 73 to rotate. The rotating rod 73 is provided with a radial protrusion 731. The blocking member 6 is slidably sleeved on the rotating rod 73. A helical spring 74 is also sleeved on the rotating rod 73. The end of the radial protrusion 731 extends between adjacent coils of the helical spring 74. When the rotating rod 73 rotates, the radial protrusion 731 moves along the helical direction of the helical spring 74 and changes the compression of the helical spring 74. The induced current generated by the NFC sensing component 8 drives the motor 71 to rotate. The output shaft of the motor 71 drives the rotating rod 73 to rotate through the gear set 72. The radial protrusion 731 on the rotating rod 73 rotates together with the rotating rod 73. Since the end of the radial protrusion 731 extends between adjacent coils of the helical spring 74, the protrusion moves relative to the helical direction of the helical spring 74 during rotation, causing the compression of the helical spring 74 between the protrusion and the blocking member 6 to... The changes are as follows: When the rotating rod 73 rotates in the forward direction, the protrusion spirals upward in the spiral direction, the compression of the upper end of the helical spring 74 increases, the spring's pushing force on the blocking member 6 increases, and the blocking member 6 moves upward to the retraction path of the locking tongue 5; when the rotating rod 73 rotates in the reverse direction, the protrusion spirals downward in the spiral direction, the spring compression decreases, and the blocking member 6 moves downward under its own weight and the spring's restoring force and moves away from the retraction path of the locking tongue 5; the elastic screw drive is achieved by the cooperation of the helical spring 74 and the radial protrusion 731, converting the rotational motion into the linear movement of the blocking member 6. The structure is simple and ingenious, and the processing cost is low; the spring drive has an elastic buffering effect, which can absorb impact and vibration and avoid rigid collision damage to parts; at the same time, the helical spring 74 itself has both transmission and energy storage functions, eliminating the need for an additional reset elastic element, making the overall structure more compact; the gear set 72 achieves speed reduction and force amplification, enabling the motor 71 to output sufficient thrust to drive the blocking member 6 with a small torque, reducing the power requirements of the motor 71.

[0023] The gear set 72 includes a first gear 721 and a second gear 722. The motor 71 drives the first gear 721 to rotate. The first gear 721 meshes with the second gear 722. The second gear 722 is located on the rotating rod 73, which is parallel to the motor 71. The parallel arrangement of the rotating rod 73 and the motor 71 makes the drive mechanism 7 have a flat overall arrangement, which is beneficial to the internal space layout of the lock body 1. The single-stage gear transmission structure is simple, has high transmission efficiency, and low failure rate. The gear ratio between the first gear 721 and the second gear 722 achieves speed reduction and force increase, ensuring that the rotating rod 73 outputs sufficient torque to drive the blocking member 6 to move. The parallel shaft arrangement makes the drive mechanism 7 compact and occupies little space, which is convenient for installation and arrangement inside the lock body 1.

[0024] The lock body 1 contains two vertical blocks 31, which are located on both sides of the rotating component 4 and are positioned opposite each other. Each of the two vertical blocks 31 has a bead 311 on its opposite surface. The outer circumference of the rotating component 4 has a spirally ascending groove 42, in which the bead 311 is embedded and slides. A button 3 is connected to the upper end of the two vertical blocks 31 and drives the blocks 31 to move vertically. When the vertical blocks 31 move downwards, the bead 311 slides along the groove 42 and drives the rotating component 4 to rotate. When the button 3 is pressed, it causes the two vertical blocks 31 to move downwards synchronously, and the bead 311 on each block moves downwards accordingly. Because the bead 311 is embedded in the spirally ascending groove 42 of the rotating component 4, it slides along the spiral trajectory of the groove 42 during vertical movement, thereby impacting the sidewall of the groove 42. The circumferential thrust is generated, driving the rotating part 4 to rotate around its own axis. The rotating part 4 drives the cam block 41 to rotate synchronously, realizing the retraction of the locking tongue 5. After the button 3 is released, the vertical block 31 moves upward under the action of the reset force, and the ball 311 slides in the opposite direction along the groove 42, driving the rotating part 4 to rotate in the opposite direction, and the locking tongue 5 extends again. The transmission structure of vertical block 31 + ball 311 + spiral groove 42 is adopted to convert the vertical linear motion of button 3 into the rotational motion of rotating part 4. The structure is ingenious and the transmission is smooth. The cooperation between ball 311 and groove 42 is rolling friction, with low friction and light operation. The symmetrical arrangement of vertical block 31 and ball 311 on both sides makes the rotating part 4 evenly stressed, and the rotation process is stable without unbalanced load. It effectively avoids the jamming phenomenon that may occur in unilateral drive, and improves the reliability of unlocking action and operation feel.

[0025] A return spring 32 is provided between button 3 and lock body 1. The upper end of the return spring 32 abuts against button 3, and the lower end abuts against lock body 1. When button 3 is pressed, return spring 32 is compressed and stores elastic potential energy. When button 3 is released, return spring 32 releases elastic potential energy and pushes button 3 upward to return it to its initial position. Button 3 drives vertical block 31 to move upward, and then through the cooperation of ball 311 and spiral groove 42, drives rotating part 4 to rotate in the opposite direction, so that cam block 41 rotates back to the position where the short axis faces the line connecting to the lock tongue 5. Lock tongue 5 extends outward under the action of fixed spring 53 and re-engages in the locking groove 21 of U-shaped lock beam 2 to achieve locking. The setting of return spring 32 enables button 3 to automatically reset after being released without manual backing, making operation simple and quick. At the same time, it ensures that button 3 is always in the pop-up position when no external force is applied, and the lock is always locked, avoiding accidental unlocking due to misoperation, and ensuring high safety. The spring return structure is simple, reliable, and has a long service life.

[0026] The locking tongue 5 includes a first locking tongue 51 and a second locking tongue 52. The first locking tongue 51 is located to the left of the cam block 41 and has a first extension 511 extending to the right of the cam block 41. The second locking tongue 52 is located to the right of the cam block 41 and has a second extension 521 extending to the left of the cam block 41. The cam block 41 is located between the first extension 511 and the second extension 521. A fixing spring 53 is provided between the first locking tongue 51 and the second locking tongue 52 and drives the first locking tongue 51 and the second locking tongue 52 to move to both sides. When the cam block 41 rotates to the direction of the short axis facing the line connecting the two locking tongues, the pushing force of the cam block 41 on the extensions decreases, and the elastic restoring force of the fixing spring 53 drives the first locking tongue 51 to move to both sides. The locking tongue 51 and the second locking tongue 52 move to the sides, and the locking tongue 5 extends and engages in the locking groove 21 to achieve locking. The first locking tongue 51 and the second locking tongue 52 adopt a plug-in extension structure. The cam block 41 is set between the two extensions. The extension and retraction of the two locking tongues 5 can be driven simultaneously by only one cam block 41. The structure is simple and compact. The plug-in structure ensures the coaxiality and motion synchronization of the two locking tongues 5, so that the extension and retraction of the two locking tongues 5 are consistent, and the locking and unlocking are more stable and reliable. The fixed spring 53 is set between the two locking tongues to provide the driving force for the two locking tongues 5 to extend outward at the same time, ensuring that the locking tongue 5 always remains in the extended state when locked, and the locking is stable and reliable.

[0027] Working process: In the locked state, the blocking member 6 is located on the retraction path of the locking tongue 5, the locking tongue 5 cannot retract inward, the cam block 41 is restricted by the locking tongue 5 and cannot rotate, and the button 3 cannot be pressed, the entire chain is in a mechanically locked state; when a device such as a mobile phone with NFC function approaches the lock body 1, the NFC sensing component 8 senses the near field communication signal and generates an induced current. The motor 71 starts to rotate after being powered by the induced current. The output shaft of the motor 71 drives the rotating rod 73 to rotate through the meshing of the first gear 721 and the second gear 722; the radial protrusion 731 on the rotating rod 73 rotates together with the rotating rod 73, due to the radial... The protrusion 731 extends into the space between adjacent coils of the helical spring 74. During rotation, the protrusion moves relative to the helical spring 74 along its helical direction, reducing the compression of the helical spring 74 between the radial protrusion 731 and the blocking member 6. Under its own weight and the spring's restoring force, the blocking member 6 moves downward and moves away from the retraction path of the latch 5, thus clearing the retraction path of the latch 5. At this time, pressing button 3 causes the two vertical blocks 31 to move downward synchronously, compressing the return spring 32. The ball 311 on the vertical block 31 moves downward accordingly. Since the ball 311 is embedded in the helical rising groove 42 of the rotating member 4, During its vertical movement, the ball 311 slides along the spiral trajectory of the groove 42, thereby generating a circumferential thrust on the sidewall of the groove 42, driving the rotating component 4 to rotate around its own axis. The rotating component 4 drives the cam block 41 to rotate synchronously. During the rotation of the cam block 41, its short axis gradually moves away from the line connecting the two latches 5, and its long axis gradually moves towards the line connecting the two latches 5. The cam block 41 is located between the first extension 511 and the second extension 521. When the two ends of the long axis of the cam block 41 push against the first extension 511 and the second extension 521 respectively, the first latch 51 and the second latch 52 overcome the elastic force of the fixing spring 53 simultaneously. Retracting inward, the latch 5 exits from the locking groove 21 of the U-shaped locking beam 2, thus unlocking; after releasing the button 3, the return spring 32 releases its elastic potential energy, pushing the button 3 upward to return it to its initial position. The button 3 drives the vertical block 31 to move upward, and the ball 311 slides in the opposite direction along the groove 42, causing the rotating part 4 to rotate in the opposite direction. The cam block 41 then rotates back to the position where the short axis faces the line connecting the two latches; the pushing force of the cam block 41 on the extension decreases, and the elastic restoring force of the fixing spring 53 drives the first latch 51 and the second latch 52 to move to both sides. The latch 5 extends out again and is locked into the locking groove 21 of the U-shaped locking beam 2, restoring the locked state.

Claims

1. A U-shaped lock with NFC near-field power supply for unlocking, comprising a lock body (1) and a U-shaped lock beam (2), wherein the lock body (1) is provided with a button (3), a rotating component (4), a cam block (41) and two latches (5), and the two ends of the U-shaped lock beam (2) are provided with locking grooves (21) adapted to the latches (5), the button (3) and the rotating component (4) are linked and cooperate to drive the rotating component (4) to rotate, the cam block (41) is disposed on the rotating component (4) and located between the two latches (5), and the circumferential surface of the cam block (41) abuts against the inner ends of the two latches (5), characterized in that: The lock body (1) is also provided with a blocking component (6), a driving mechanism (7) and an NFC sensing component (8). The NFC sensing component (8) is located inside the lock body (1) and is electrically connected to the driving mechanism (7). The driving mechanism (7) is connected to the blocking component (6) and drives the blocking component (6) to move inside the lock body (1). The blocking component (6) is opposite to the retraction path of the lock tongue (5).

2. A U-lock according to claim 1, wherein: The drive mechanism (7) includes a motor (71), a gear set (72) and a rotating rod (73). The motor (71) is electrically connected to the NFC sensing component (8). The gear set (72) is connected between the output shaft of the motor (71) and the rotating rod (73) and drives the rotating rod (73) to rotate. A radial protrusion (731) is provided on the rotating rod (73). A blocking member (6) is slidably sleeved on the rotating rod (73). A helical spring (74) is also sleeved on the rotating rod (73). The end of the radial protrusion (731) extends into the adjacent turns of the helical spring (74). When the rotating rod (73) rotates, the radial protrusion (731) moves along the helical direction of the helical spring (74) and changes the compression of the helical spring (74).

3. A U-lock according to claim 2, wherein: The gear set (72) includes a first gear (721) and a second gear (722). The motor (71) drives the first gear (721) to rotate. The first gear (721) meshes with the second gear (722). The second gear (722) is mounted on a rotating rod (73). The rotating rod (73) is parallel to the motor (71).

4. The U-lock of claim 1, wherein: The lock body (1) is provided with two vertical blocks (31). The two vertical blocks (31) are located on both sides of the rotating part (4) and are arranged opposite each other. A ball (311) is provided on the opposite surface of the two vertical blocks (31). A spiral groove (42) is provided on the outer circumference of the rotating part (4). The ball (311) is embedded in the groove (42) and slides in cooperation with the groove (42). The button (3) is connected to the upper end of the two vertical blocks (31) and drives the vertical blocks (31) to move vertically. When the vertical blocks (31) move down, the ball (311) slides along the groove (42) and drives the rotating part (4) to rotate.

5. The U-lock of claim 1, wherein: the NFC antenna is configured to receive power from an NFC field to power the lock. A reset spring (32) is provided between the button (3) and the lock body (1). The upper end of the reset spring (32) abuts against the button (3), and the lower end abuts against the lock body (1).

6. The NFC field powered unlocked U-lock of claim 1, wherein: The locking tongue (5) includes a first locking tongue (51) and a second locking tongue (52). The first locking tongue (51) is located on the left side of the cam block (41) and has a first extension (511) extending to the right side of the cam block (41). The second locking tongue (52) is located on the right side of the cam block (41) and has a second extension (521) extending to the left side of the cam block (41). The cam block (41) is located between the first extension (511) and the second extension (521). A fixing spring (53) is provided between the first locking tongue (51) and the second locking tongue (52) and drives the first locking tongue (51) and the second locking tongue (52) to move to both sides.

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