A lock with good security

Abstract

The application relates to a lock with high safety, which enhances the safety of the lock through a simple structure. Specifically, the lock comprises a lock cylinder and a key. The lock cylinder comprises a lock shell, the lock shell comprises a lock shell connecting portion installation cavity, a main ball locking assembly which can be telescopically arranged in the lock cylinder along the vertical direction is arranged between the lock shell connecting portion and the lock cylinder, a special-shaped magnetic ball locking assembly which can be telescopically arranged in the lock cylinder is arranged between the installation cavity inner wall surface and the lock cylinder in the axial direction, the main ball locking assembly and the special-shaped magnetic ball locking assembly are used for locking and releasing the circumferential limiting between the lock cylinder and the lock shell; the key is provided with a first tooth opening corresponding to the main ball locking assembly, and the key is further provided with a first magnet corresponding to the special-shaped magnetic ball locking assembly; when the key is inserted into the key hole, the upper end of the main ball locking assembly is correspondingly inserted into the first tooth opening, and the special-shaped magnetic ball locking assembly is attracted into the lock cylinder by the first magnet; at this time, the key can be rotated to drive the lock cylinder to rotate, so that the lock is opened.

Description

Technical Field

[0001] This invention relates to the field of locks, and more specifically to a lock with good security. Background Technology

[0002] Currently available mechanical locks still have many shortcomings in terms of security, structural rationality, and production cost, making it difficult to meet the ever-increasing anti-theft demands.

[0003] Most existing locks use a unidirectional layout design for their locking components, typically consisting of two rows of pins arranged radially. This unidirectional layout is relatively simple, has a limited number of keys, and is easy to copy. Criminals can easily copy keys with simple tools or use technical means to pry open the pin assembly, posing a serious security risk. The unidirectional pin layout also has the problem of large gaps between the pins, making it easy to exploit with tools such as picks, further reducing the anti-theft performance of the lock and failing to effectively prevent technical unlocking attempts.

[0004] To enhance anti-theft performance, some existing technologies attempt to use combinations of at least three different types of pins, increasing the number of keys and the difficulty of cracking by increasing the variety of pins. However, this multi-pin combination design leads to an exceptionally complex internal structure of the lock cylinder, significantly increasing the number of parts. This not only increases the difficulty of lock production and assembly and prolongs the production cycle, but also significantly increases production costs. At the same time, the complex structure also reduces the stability of the lock, making it prone to problems such as pin jamming and premature wear, affecting the lifespan of the lock and hindering its widespread application.

[0005] Therefore, developing a lock that is simple in structure, easy to assemble, and low in production cost, while effectively improving anti-theft security and making the key difficult to copy, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention overcomes the shortcomings of the above-mentioned technologies and provides a lock with good security.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-security lock includes a lock cylinder and a key for locking and unlocking the lock cylinder by inserting it. The lock cylinder includes a lock case and a rotatable lock cylinder installed within the lock case. The lock cylinder has a keyhole axially extending through it for key insertion. The lock case includes a lock case connecting portion and a mounting cavity for mounting the lock cylinder. A main pin locking assembly, which can move vertically and retract within the lock cylinder, is radially disposed between the lock case connecting portion and the lock cylinder. A non-circular magnetic bead locking assembly, which can move forward and backward within the lock cylinder, is axially disposed between the inner wall of the mounting cavity and the lock cylinder. The main pin locking assembly and the irregular magnetic bead locking assembly are both used to lock / unlock the circumferential limit between the lock cylinder and the lock shell. The key has a first tooth that corresponds to the main pin locking assembly, and the key is also equipped with a first magnet that corresponds to the irregular magnetic bead locking assembly. When the key is inserted into the keyhole, the upper end of the main pin locking assembly is pushed into the first tooth, and at the same time, the irregular magnetic bead locking assembly is pulled into the lock cylinder by the first magnet. At this time, the circumferential limit between the lock cylinder and the lock shell is released, and turning the key can drive the lock cylinder to rotate, thereby unlocking the lock.

[0009] Preferably, the main pin locking assembly includes a first spring, a flat ball abutting against the upper end of the first spring, and a main pin abutting against the upper end of the flat ball. The lock housing connecting part has a first mounting hole communicating with the mounting cavity, and the lock cylinder has a second mounting hole communicating with the keyhole. The first spring and the flat ball are installed in the first mounting hole, and the main pin is limited and installed in the second mounting hole. The first mounting hole and the second mounting hole are coaxially connected, and the diameter of the first mounting hole is the same as the diameter of the second mounting hole. The first toothed groove includes a toothed groove for pressing and partially accommodating the main pin.

[0010] Preferably, the first mounting hole passes through the lock housing connection and extends out of the lock housing. The main ball locking assembly further includes a threaded bolt that is threadedly connected to the lock housing connection and seals the lower end of the first mounting hole. The lower end of the first spring is sleeved on the outer periphery of the bolt.

[0011] Preferably, the main ball is in the shape of an upward-pointing bullet, the main ball locking assembly is arranged in six sets at equal intervals, and the tooth groove is arranged in six sets at equal intervals.

[0012] Preferably, the irregular magnetic bead locking assembly includes an irregular magnetic bead and a second spring that abuts against the irregular magnetic bead. A groove is provided on the inner wall of the mounting cavity for inserting one end of the irregular magnetic bead. A third mounting hole communicating with the keyhole is provided on the lock cylinder. The other end of the irregular magnetic bead is inserted into the third mounting hole and can be movably extended and retracted in the keyhole.

[0013] Preferably, the third mounting hole includes a through hole and symmetrically formed mounting grooves on both sides of the through hole. The second spring is installed in the mounting groove, with one end of the second spring abutting against the bottom surface of the mounting groove and the other end abutting against the irregularly shaped magnetic bead.

[0014] Preferably, the irregular magnetic bead includes a cylindrical portion and an elongated portion disposed at one end of the cylindrical portion and extending outward on both sides. The outer diameter of the cylindrical portion is adapted to the inner diameter of the through hole to facilitate telescoping within the through hole. The two ends of the elongated portion abut against the second springs on both sides and are held in a recessed state under the force of the second springs. The end of the cylindrical portion facing the keyhole forms a mounting cavity, in which a second magnet is installed.

[0015] Preferably, the groove includes two straight sides arranged parallel to each other and an arc segment connecting the two ends of the two straight sides respectively. The arc segment is tangent to the straight sides, and the two opposite corners at the bottom of the groove are rounded. The long strip is in the shape of a sloping trapezoid that is narrower at the top and wider at the bottom, and the corners of the long strip are rounded.

[0016] Preferably, the locking cylinder includes a cylinder head and a cylinder body, and a first anti-drilling pin is installed inside the cylinder head.

[0017] Preferably, a second anti-drilling pin is vertically installed inside the lock housing connection part. Two second anti-drilling pins are arranged in parallel left and right, and the two second anti-drilling pins are respectively located at the lower end of the gallbladder head and the lower end of the gallbladder body near the gallbladder head.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This design employs a radial and axial bidirectional locking layout. A main pin locking assembly is radially positioned between the lock housing connection and the lock cylinder, while a shaped magnetic bead locking assembly is axially positioned between the inner wall of the mounting cavity and the lock cylinder. These two locking assemblies work together to lock and release the circumferentially limited movement between the lock cylinder and the lock housing. Compared to the existing layout with a single radial row of pins, this bidirectional locking layout creates a double anti-theft barrier, significantly increasing the difficulty of illegal unlocking. The shaped magnetic bead locking assembly uses a magnetic attraction method, working in conjunction with the first magnet mounted on the key to achieve magnetic unlocking. This operation is extremely convenient; after the key is inserted, no additional force is required, and the first magnet quickly and accurately attracts the shaped magnetic bead locking assembly and pulls it into the lock cylinder. Simultaneously, the first tooth pushes out the main pin locking assembly, achieving rapid unlocking. Compared to traditional pin structures, the magnetic attraction is smoother and less prone to jamming, significantly improving the ease of unlocking. Meanwhile, the magnetic attraction structure significantly enhances the key's difficulty in duplication. Criminals not only need to precisely copy the first tooth of the matching main pin on the key, but also the magnetism, installation position, and magnetic pole direction of the first magnet. The magnetic parameters and assembly precision of the first magnet are difficult to replicate easily, further increasing the difficulty of illegal unlocking and key duplication, forming a double anti-theft barrier, effectively blocking technical unlocking attempts, and protecting the safety of people and property. Furthermore, this application uses only a combination of two locking structures, replacing the complex design of at least three or more pin combinations in existing technologies. While ensuring significantly improved anti-theft performance, it simplifies the internal structure of the lock cylinder, reduces the number of parts, lowers the difficulty of production and assembly, shortens the production cycle, and reduces production costs, facilitating mass production and market promotion. It solves the problem of "improved anti-theft performance at the expense of structural complexity and increased production costs" in existing technologies, achieving a balance between anti-theft performance and economy. The two locking components and key working together in this design are simple and efficient. Inserting the key simultaneously releases the circumferential limit, resulting in smooth and convenient operation. The two components have clear movement trajectories, do not interfere with each other, and work precisely, effectively preventing jamming or loosening. This ensures stable and reliable locking and unlocking actions, extending the lock's lifespan. Furthermore, the radial and axial bidirectional layout design fully utilizes the internal space of the lock cylinder without increasing its volume. It is compatible with the installation dimensions of various existing locks, requiring no modification to the existing installation structure. Its strong adaptability allows for wide application in various security scenarios, demonstrating high practical value and market competitiveness. Attached Figure Description

[0020] Figure 1 This is an exploded view of the overall structure of the lock in this case.

[0021] Figure 2 This is a schematic diagram of the explosion state of the locking cylinder, main pin locking assembly, and irregular magnetic bead locking assembly in this case.

[0022] Figure 3 This is a structural diagram of the lock shell in this case.

[0023] Figure 4 This is a side view of the lock cylinder in this case.

[0024] Figure 5 This is the case Figure 4 A cross-sectional view along the AA direction.

[0025] Figure 6 This is the front view of the lock cylinder in this case.

[0026] Figure 7 This is the case Figure 6 A cross-sectional view along the BB direction.

[0027] Figure 8 This is a schematic diagram of the assembly state of the irregular magnetic bead and the second spring in this case. Detailed Implementation

[0028] The following examples further illustrate the features and other related characteristics of the present invention in detail, to facilitate understanding by those skilled in the art:

[0029] For ease of description and understanding, please refer to the attached diagram for descriptions related to positional relationships such as front, back, top, bottom, left, right, outside, and inside in this case.

[0030] like Figures 1 to 8As shown, this invention provides a high-security lock, including a lock cylinder 100 and a key 200 for locking and unlocking the lock cylinder 100 by inserting it into the lock cylinder 100. The lock cylinder 100 includes a lock housing 1 and a rotatable lock cylinder 2 installed inside the lock housing 1. A keyhole 21 for inserting the key 200 is axially provided on the lock cylinder 2. The lock housing 1 includes a lock housing connecting part 11 and a mounting cavity 12 for installing the lock cylinder 2. A main pin locking assembly 3 is radially disposed between the lock housing connecting part 11 and the lock cylinder 2 and can move and extend vertically within the lock cylinder 2. The main pin locking assembly 3 achieves circumferential limiting locking and unlocking between the lock cylinder 2 and the lock housing connecting part 11 through its own extension and retraction. A non-circular magnetic bead locking assembly 4, which can move and retract within the lock cylinder 2 in the front-to-back direction, is axially arranged between the inner wall of the mounting cavity 12 and the lock cylinder 2. Both the main pin locking assembly 3 and the non-circular magnetic bead locking assembly 4 are used to lock / unlock the circumferential limit between the lock cylinder 2 and the lock shell 1. The non-circular magnetic bead locking assembly 4 and the main pin locking assembly 3 work together to achieve circumferential limitation between the lock cylinder 2 and the lock shell 1, forming bidirectional protection and further enhancing the anti-theft effect. The key 200 has a first tooth 201 that corresponds to and engages with the main pin locking assembly 3, and the key 200 is also equipped with a first magnet 202 that corresponds to and engages with the non-circular magnetic bead locking assembly 4. The lock cylinder 2 requires the first tooth 201 of the key 200 and the first magnet 202 to drive the main pin locking assembly 3 and the irregular magnetic bead locking assembly 4 to move synchronously in order to release the lock cylinder 2's locking mechanism. This complex and interlocking mechanism further enhances the security of the lock cylinder 100 and the difficulty of copying the key 200. Criminals not only need to copy the tooth shape and depth of the first tooth 201, but also need to match the magnetism, installation position, and magnetic pole direction of the first magnet 202, thus preventing illegal copying and technical unlocking at the source. When the key 200 is inserted into the keyhole 21, the upper end of the main pin locking assembly 3 is correspondingly pushed into the first tooth 201, while the irregular magnetic bead locking assembly 4 is drawn into the lock cylinder 2 by the first magnet 202. At this point, the circumferential locking between the lock cylinder 2 and the lock shell 1 is released, and turning the key 200 can rotate the lock cylinder 2 to unlock it.

[0031] This application enhances the security of the lock cylinder 100 and the difficulty in duplicating the key 200 by using two different sets of locking components arranged in two different directions, radially and axially. This two-way layout design differs from the single structure of two rows of beads arranged radially in the upper and lower parts of the existing technology, forming a double anti-theft barrier. Criminals must simultaneously crack the locking components in two different directions, significantly increasing the difficulty of illegal opening. At the same time, this application replaces the complex design of the existing technology, which generally uses at least three types of beads to improve anti-theft performance, with a combination of two types of beads. It achieves improved anti-theft performance with a simple structure, effectively solving the technical defects of the existing technology, such as complex structure, high assembly difficulty, and high production cost.

[0032] As described above, under normal conditions (when key 200 is not inserted), the main pin locking assembly 3 is partially located inside the lock cylinder 2 and partially engages with the lock housing connection part 11. The irregular magnetic bead locking assembly 4 is partially located inside the lock cylinder 2 and partially engages with the inner wall of the mounting cavity 12. Together, they form a circumferential limit on the lock cylinder 2, preventing it from rotating inside the lock housing 1, and the lock is in the locked state. When key 200 is inserted into the keyhole 21, the first tooth 201 on key 200 precisely aligns with the main pin locking assembly 3, pushing the upper end of the main pin locking assembly 3 into the corresponding first tooth 201, thus locking the lock. The main pin locking assembly 3 disengages from the lock housing connection 11. At the same time, the first magnet 202 on the key 200 generates a magnetic attraction force, drawing the irregular magnetic bead locking assembly 4 into the lock cylinder 2, causing the irregular magnetic bead locking assembly 4 to disengage from the inner wall of the mounting cavity 12. At this time, the circumferential limit between the lock cylinder 2 and the lock housing 1 is completely released. Turning the key 200 will drive the lock cylinder 2 to rotate synchronously, thereby realizing the unlocking action of the lock. After the key 200 is pulled out, the main pin locking assembly 3 and the irregular magnetic bead locking assembly 4 automatically reset, restoring the circumferential limit on the lock cylinder 2, and the lock is relocked.

[0033] Specifically, the main pin locking assembly 3 includes a first spring 31, a flat pin 32 abutting against the upper end of the first spring 31, and a main pin 33 abutting against the upper end of the flat pin 32. In specific implementation, the first spring 31 is a helical compression spring, ensuring that the flat pin 32 is always subjected to an upward thrust, providing continuous elastic force to drive the flat pin 32 and the main pin 33 to maintain an upward locked state. Through the linkage of the first spring 31, the flat pin 32, and the main pin 33, the locking state is reliably guaranteed under stable elastic force output, avoiding accidental unlocking due to vibration or external force. A first mounting hole 111 communicating with the mounting cavity 12 is provided on the lock housing connecting part 11, and a second mounting hole 22 communicating with the keyhole 21 is provided on the lock cylinder 2. The first spring 31 and the flat pin 32 are installed in the first mounting hole 111, and the main pin 33 is limited and installed in the second mounting hole 22. Under normal conditions, the first spring 31 maintains an upward elastic force, thereby driving the flat ball 32 to engage between the first mounting hole 111 and the second mounting hole 22, achieving circumferential limiting of the lock shell 1 and the lock cylinder 2. At this time, the front end of the main ball 33 extends into the keyhole 21, thus achieving a locking effect. When the key 200 is inserted, the first tooth 201 corresponding to the key 200 fully presses the main ball 33 back into the second mounting hole 22 to reset it. Simultaneously, the main ball 33 moves downward to fully press the flat ball 32 back into the first mounting hole 111 to reset it, releasing the circumferential limiting of the lock shell 1 and the lock cylinder 2. At this time, rotating the lock cylinder 2 can cause the main ball 33 and the flat ball 32 to separate and abut, realizing the rotatable unlocking of the lock cylinder 2.

[0034] As is well known to those skilled in the art, the design of various components and mechanisms in the lock cylinder field is quite precise, requiring high accuracy. In specific implementation, the first mounting hole 111 and the second mounting hole 22 are coaxially connected. The diameter of the first mounting hole 111 is the same as the diameter of the second mounting hole 22. The first mounting hole 111 and the second mounting hole 22 provide a movement trajectory for the main pin locking assembly 3, ensuring that the flat ball 32 and the main pin 33 can extend and retract smoothly, and providing a stable guide for their extension and retraction, ensuring the stability of locking and unlocking. In specific implementation, the outer diameter of the flat ball 32 and the main pin 33 is slightly smaller than the inner diameter of the first mounting hole 111 and the second mounting hole 22 to further ensure the stability of the movement of the main pin locking assembly 3. Furthermore, the first tooth 201 includes a tooth groove 2011 for pressing and partially accommodating the main pin 33. When the key 200 is fully inserted into the lock cylinder 2, the end portion of the main pin 33 is accommodated in the corresponding tooth groove 2011, thereby achieving unlocking. In practice, to increase anti-theft capabilities, the first mounting hole 111 and the second mounting hole 22 can be inclined relative to the lock shell 1 and the lock cylinder 2, or they can be vertical. In this case, the inclined setting is preferred. The inclined first mounting hole 111 and the second mounting hole 22 can increase the difficulty of inserting illegal tools, and it is not easy for a non-matching key to simultaneously reach all the main pin locking components 3.

[0035] Furthermore, the first mounting hole 111 penetrates through the lock housing connecting part 11 and extends out of the lock housing 1. The main pin locking assembly 3 also includes a threaded bolt 34 threadedly connected to the lock housing connecting part 11 to seal the lower end of the first mounting hole 111. In this embodiment, by further adding the bolt 34 to seal the lower end of the first mounting hole 111, it is possible to effectively prevent external moisture, dust, foreign objects, etc. from entering the lock cylinder 100 through the first mounting hole 111, avoiding corrosion and jamming of internal components, improving the waterproof and dustproof performance of the lock, and extending the service life of the lock. Secondly, it also prevents criminals from prying open the main pin locking assembly 3 through the first mounting hole 111, further enhancing the anti-theft security of the lock. Secondly, it facilitates assembly and disassembly. The threaded connection allows for quick screwing of the bolt 34 into or out of the lock housing connection 11, simplifying the installation, disassembly, and maintenance of the main pin locking assembly 3. When the main pin 33, flat pin 32, or first spring 31 wears or malfunctions, the bolt 34 can be quickly removed for replacement or maintenance without disassembling the entire lock housing 1, reducing maintenance difficulty and cost. Simultaneously, the bolt 34 provides support and limiting. The lower end of the first spring 31 is fitted around the bolt 34, allowing for precise limiting of the lower end of the first spring 31. This ensures that the first spring 31 can only extend and retract along the axis of the bolt 34, preventing bending, displacement, or detachment during extension and retraction, ensuring stable spring force output, and thus guaranteeing the reliability of the extension and retraction of the main pin locking assembly 3. In practical implementation, the bolt head of bolt 34 is provided with an opening groove, preferably a hexagonal groove. Compared with commonly used flathead and Phillips screwdrivers, non-technical personnel are less likely to find the tools to disassemble it, thus preventing unauthorized disassembly of the lock cylinder 100. At the same time, the hexagonal groove allows professional operators to quickly open or tighten bolt 34 using professional tools, further improving the convenience of assembly and maintenance.

[0036] Preferably, the main pin 33 is bullet-shaped with an upward-facing tip. The bullet-shaped shape reduces friction between the main pin 33 and the inner wall of the first tooth 201 and the second mounting hole 22, making the extension and retraction of the main pin 33 smoother, avoiding jamming, and improving the smoothness of unlocking and locking. The tip design of the bullet reduces the contact area, further reducing frictional resistance. On the other hand, the bullet-shaped structure increases the difficulty for criminals to pry the main pin 33. Criminals cannot accurately pry the bullet-shaped main pin 33 with conventional tools, further improving the anti-theft performance of the lock. Moreover, the bullet-shaped end can accurately fit with the tooth groove 2011, ensuring that the pressing action of the first tooth 201 on the main pin 33 is accurate and stable, avoiding slippage or deviation during the pressing process.

[0037] In this embodiment, six sets of main pin locking components 3 are arranged side-by-side at equal intervals, and six corresponding tooth grooves 2011 are arranged side-by-side at equal intervals. The six sets of main pin locking components 3 represent the optimal balance between anti-theft performance and production cost. This is because the combination of the six sets of main pin locking components 3 can form a large number of different key combinations, significantly increasing the difficulty of copying the key 200. Criminals will find it difficult to copy the first tooth 201 of the key 200 using conventional methods, further enhancing the anti-theft security of the lock. At the same time, compared to designs with more sets, six sets can effectively control the number of parts, avoiding overly complex structures and reducing production and assembly costs. Compared to designs with fewer sets, it can ensure a sufficient number of keys to meet anti-theft requirements. Of course, to balance production cost and anti-theft performance, the number of main pin locking components 3 is not limited to six sets in specific implementations; it can also be more or less, such as four, five, or seven sets, as long as the corresponding locking function is achieved and the anti-theft requirements are met, all of which fall within the scope of protection of this invention.

[0038] Specifically, the irregular magnetic bead locking assembly 4 includes an irregular magnetic bead 41 and a second spring 42 that abuts against the irregular magnetic bead 41. A groove 121 is formed on the inner wall of the mounting cavity 12 for inserting one end of the irregular magnetic bead 41. The size and shape of the groove 121 are adapted to the end of the irregular magnetic bead 41, providing a locking and limiting point for the irregular magnetic bead 41. When one end of the irregular magnetic bead 41 is inserted into the groove 121, it can form a circumferential limit on the lock cylinder 2, preventing the lock cylinder 2 from rotating and ensuring that the irregular magnetic bead 41 will not loosen or shift after insertion, while also facilitating the smooth disengagement of the irregular magnetic bead 41. A third mounting hole 23 communicating with the keyhole 21 is formed on the lock cylinder 2. The third mounting hole 23 provides installation and extension space for the irregular magnetic bead 41, and also serves as a guide and limiting function, ensuring that the irregular magnetic bead 41 can smoothly and stably extend and retract in the third mounting hole 23, so as to achieve precise cooperation with the groove 121 and the first magnet 202. The other end of the irregularly shaped magnetic bead 41 is inserted into the third mounting hole 23 and can extend and retract within the keyhole 21. This installation method ensures that the irregularly shaped magnetic bead 41 can both abut against the second spring 42 to achieve locking and resetting, and form a magnetic attraction with the first magnet 202 on the key 200 to achieve unlocking. At the same time, the extendable design ensures that the irregularly shaped magnetic bead 41 can be accurately inserted into or removed from the groove 121, ensuring the smoothness of locking and unlocking actions. In specific implementation, the second spring 42 is a helical compression spring, which, under normal conditions (locked state), always keeps one end of the irregularly shaped magnetic bead 41 pushed into the groove 121, so that the irregularly shaped magnetic bead 41 forms a tight fit with the inner wall of the mounting cavity 12, thereby achieving circumferential locking between the lock cylinder 2 and the lock shell 1, preventing the lock cylinder 2 from rotating accidentally. When the key 200 is inserted, under the magnetic attraction of the first magnet 202, the irregular magnetic bead 41 overcomes the elastic force of the second spring 42 and contracts. The second spring 42 is slightly compressed. After the key 200 is pulled out, the second spring 42 can drive the irregular magnetic bead 41 to automatically reset and restore the locked state, ensuring the automatic locking function of the lock and improving the convenience of use.

[0039] Furthermore, the third mounting hole 23 includes a through hole 231 and symmetrically formed mounting grooves 232 on both sides of the through hole 231. The through hole 231 ensures that the irregularly shaped magnetic bead 41 can smoothly extend and retract within the through hole 231 without jamming or offset. It also provides precise guidance for the extension and retraction trajectory of the irregularly shaped magnetic bead 41, ensuring that it always extends and retracts along the front-back direction of the through hole 231. This guarantees that the irregularly shaped magnetic bead 41 can accurately insert into or dislodge from the groove 121, preventing locking or unlocking failures due to trajectory offset. The second spring 42 is installed in the mounting groove 232, with one end abutting against the bottom surface of the mounting groove 232 and the other end abutting against the irregularly shaped magnetic bead 41. The mounting groove 232 provides an installation position for the second spring 42, limiting and fixing it to prevent offset, detachment, or bending during extension and retraction, ensuring the installation stability of the second spring 42. Meanwhile, one end of the second spring 42 abuts against the bottom surface of the mounting groove 232, and the other end abuts against the irregularly shaped magnetic bead 41. This installation method ensures that the elastic force of the second spring 42 is evenly applied to the irregularly shaped magnetic bead 41, making the extension and retraction of the irregularly shaped magnetic bead 41 smooth and stable. It avoids the irregularly shaped magnetic bead 41 from getting stuck or not resetting in time due to uneven elastic force, further improving the operational reliability of the irregularly shaped magnetic bead locking assembly 4. In addition, the symmetrically arranged mounting groove 232 and second spring 42 can make the elastic force on the irregularly shaped magnetic bead 41 more balanced, ensuring that the irregularly shaped magnetic bead 41 always maintains a horizontal state during extension and retraction, preventing the irregularly shaped magnetic bead 41 from tilting during extension and retraction, further improving the fitting accuracy between the irregularly shaped magnetic bead locking assembly 4, the groove 121, and the first magnet 202, ensuring the accuracy and stability of the locking and unlocking actions. At the same time, the symmetrical structure also facilitates production and processing, reducing the processing difficulty.

[0040] Specifically, the irregularly shaped magnetic bead 41 includes a cylindrical portion 411 and an elongated portion 412 disposed at one end of the cylindrical portion 411 and extending outward on both sides, which are integrally formed. The outer diameter of the cylindrical portion 411 is adapted to the inner diameter of the through hole 231 to facilitate telescoping within the through hole 231, thus acting as a limiting guide to ensure the stability of the telescoping movement of the cylindrical portion 411, allowing it to be accurately inserted into the keyhole 21 and form a magnetic attraction with the first magnet 202. The two ends of the elongated portion 412 abut against the second springs 42 on both sides and are held in a position pushed into the groove 121 by the force of the second springs 42. The elongated section 412, with its outward extensions on both sides, serves to limit the installation of the second spring 42. Specifically, the two ends of the elongated section 412 can limit the second spring 42 on both sides, preventing the second spring 42 from bending, shifting, or dislodging from the mounting groove 232 when under pressure. This ensures the installation stability and stable spring force output of the second spring 42, thereby guaranteeing the reliable extension and retraction of the irregularly shaped magnetic bead 41. Secondly, it cooperates with the groove 121 structure to provide a certain anti-torsional force. The shape of the elongated section 412 is consistent with... The groove 121 is compatible, and after insertion into the groove 121, it can effectively resist the torque on the lock cylinder 2, preventing criminals from using torque to pry open the lock cylinder 2 and further improving the anti-theft performance. This anti-torsion structure cannot be achieved by traditional round pins. Thirdly, it transmits the elastic force of the second spring 42. The long strip 412 abuts against the second spring 42, which can evenly transmit the elastic force of the second spring 42 on both sides to the cylindrical part 411, ensuring that the extension and retraction of the irregular magnetic bead 41 is smooth and stable, and avoiding jamming due to uneven force. Furthermore, an installation cavity 413 is formed at the end of the cylindrical part 411 facing the keyhole 21, and a second magnet 414 is installed in the installation cavity 413. Through the magnetic attraction between the second magnet 414 and the first magnet 202, the irregular magnetic bead 41 is driven, thereby locking and unlocking the lock cylinder 2. When the key 200 is inserted into the keyhole 21, under the attraction of the first magnet 202 and the second magnet 414, the cylindrical part 411 is partially drawn into the keyhole 21 by the first magnet 202, the elongated part 412 compresses the spring and partially extends into the third mounting hole 23, and at the same time the elongated part 412 is dislodged from the groove 121, releasing the circumferential restriction of the irregular magnetic bead locking assembly 4 on the lock cylinder 2.

[0041] Preferably, the groove 121 includes two parallel straight edges and arc segments connecting the two ends of the straight edges. The arc segments are tangent to the straight edges, and the two opposite corners at the bottom of the groove 121 are rounded. The elongated portion 412 is a trapezoidal shape that is narrower at the top and wider at the bottom, and its corners are rounded. The parallel straight edges can precisely fit the upper and lower surfaces of the elongated portion 412, ensuring that the elongated portion 412 will not shift vertically after being inserted into the groove 121, thus improving locking stability. The tangency of the arc segments to the straight edges reduces the frictional resistance when the elongated portion 412 is inserted into and removed from the groove 121, preventing jamming. It also prevents sharp edges from appearing on the edges of the groove 121, preventing wear on the elongated portion 412 and extending the service life of the component. The rounded corner design at the bottom of the groove 121 further reduces friction and prevents the elongated portion 412 from being scratched by sharp edges during insertion, ensuring smooth fit and avoiding stress concentration at the edges. The trapezoidal design of the elongated section 412 allows it to perfectly fit into the groove 121, increasing the contact area and further enhancing the stability and torsional resistance of the lock. This effectively prevents criminals from prying open the lock cylinder 2 using technical means, thus improving anti-theft performance. The trapezoidal shape also creates a locking structure after the elongated section 412 is inserted into the groove 121, further preventing the lock cylinder 2 from rotating and strengthening the locking effect. The rounded corners of the elongated section 412 reduce friction with the groove 121 and the inner wall of the third mounting hole 23, preventing jamming and wear on the corners, thus extending the service life of the irregularly shaped magnetic bead 41. The irregular structure of the groove 121 and the elongated section 412 in this case not only achieves precise locking and unlocking extension, but also greatly increases the difficulty for criminals to copy and pry it open. Unlike the simple combination of traditional round pins, it raises the technical barrier of the lock and further strengthens the anti-theft performance of the lock, making it difficult for criminals to adapt the irregular structure with conventional tools and thus unable to illegally open it.

[0042] In this embodiment, the lock cylinder 2 includes a cylinder head 24 and a cylinder body 25. To further enhance anti-theft performance, a first anti-drilling pin 6 is installed inside the cylinder head 24. The first anti-drilling pin 6 serves to prevent drilling and theft, preventing criminals from using tools such as electric drills to drill holes from the end of the cylinder head 24, damaging the internal structure of the lock cylinder 2 and thus illegally unlocking it. In specific implementation, the first anti-drilling pin 6 is made of high-strength metal material with high hardness, impact resistance, and wear resistance, such as manganese steel or quenched high-carbon steel. In specific implementation, at least three first anti-drilling pins 6 are installed at equal intervals along the outer periphery of the cylinder head 24 to ensure that the cylinder head 24 is protected against drilling from all directions, avoiding blind spots in protection. No matter which side of the cylinder head 24 a criminal attempts to drill from, the first anti-drilling pin 6 will block the drilling, forming all-round end anti-drilling protection.

[0043] To further enhance the security of the lock cylinder 100, a second anti-drilling pin 7 is vertically installed inside the lock housing connection part 11. Specifically, two second anti-drilling pins 7 are arranged parallel to each other on the left and right sides, located at the lower end of the cylinder head 24 and the lower end of the cylinder body 25 near the cylinder head 24, respectively. The second anti-drilling pins 7 effectively prevent criminals from using tools such as electric drills from outside the door to drill through the lock housing connection part 11, damaging the core components inside the lock cylinder 100 such as the main pin locking assembly 3 and the cylinder 2, thereby achieving illegal unlocking. The second anti-drilling pins 7 and the first anti-drilling pin 6 form all-around anti-drilling protection, further improving the security of the lock cylinder 100.

[0044] The working principle of the lock in this case is described in detail below, in conjunction with the full text:

[0045] In the normal state (locked state), in the main pin locking assembly 3, the first spring 31 always maintains an upward elastic force, thereby driving the flat ball 32 from the first mounting hole 111 into the second mounting hole 22, so that the flat ball 32 is simultaneously locked between the lock shell 1 and the lock cylinder 2, and at the same time, the front end of the main pin 33 extends into the keyhole 21, thereby achieving the locking effect; at this time, in the irregular magnetic bead locking assembly 4, the second spring 42 pushes the irregular magnetic bead 41, so that the long strip 412 is inserted into the groove 121 on the inner wall of the mounting cavity 12, thereby achieving circumferential limiting between the lock cylinder 2 and the lock shell 1.

[0046] When unlocking with key 200, key 200 is inserted into the keyhole 21 of the lock cylinder 2. The first teeth 201 on key 200 correspond one-to-one with the main pins 33. As key 200 is gradually inserted, the tooth grooves 2011 press against the main pins 33, and the upper ends of the main pins 33 are pushed into the corresponding tooth grooves 2011 one by one. Key 200 fully presses the main pins 33 back into the second mounting hole 22 to reset, and at the same time fully presses the flat pins 32 back into the first mounting hole 111 to reset, releasing the circumferential limitation of the main pin locking assembly 3 on the lock cylinder 2; at the same time, key 200 The first magnet 202 on the keyhole 201 generates a magnetic attraction force, which, through the second magnet 414 mounted on the irregular magnetic bead 41, attracts the cylindrical part 411 of the irregular magnetic bead 41 to move towards the keyhole 21. The elongated part 412 compresses the second spring 42 and partially extends into the third mounting hole 23. The elongated part 412 disengages from the groove 121, releasing the circumferential restriction of the irregular magnetic bead locking assembly 4 on the lock cylinder 2. At this time, the circumferential restriction between the lock cylinder 2 and the lock shell 1 is completely released. Turning the key 200 causes the lock cylinder 2 to rotate within the mounting cavity 12, thereby unlocking the lock.

[0047] As stated above, this case protects a type of lock with good security, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A high-security lock, comprising a lock cylinder (100) and a key (200) for inserting into the lock cylinder (100) to lock and unlock it, the lock cylinder (100) comprising a lock housing (1) and a rotatable lock cylinder (2) installed within the lock housing (1), the lock cylinder (2) having an axially extending keyhole (21) for inserting the key (200), the lock housing (1) comprising a lock housing connecting portion (11) and a mounting cavity (12) for mounting the lock cylinder (2), characterized in that: A main pin locking assembly (3) that can move and extend vertically within the lock cylinder (2) is radially arranged between the lock housing connecting part (11) and the lock cylinder (2). A non-circular magnetic bead locking assembly (4) that can move and extend vertically within the lock cylinder (2) is axially arranged between the inner wall of the mounting cavity (12) and the lock cylinder (2). Both the main pin locking assembly (3) and the non-circular magnetic bead locking assembly (4) are used to lock / unlock the circumferential limit between the lock cylinder (2) and the lock housing (1). The key (200) has a corresponding opening to the main pin locking assembly (3). The key (200) is also equipped with a first magnet (202) that corresponds to the shaped magnetic bead locking assembly (4). When the key (200) is inserted into the keyhole (21), the upper end of the main ball locking assembly (3) is pushed into the first tooth (201), and at the same time, the shaped magnetic bead locking assembly (4) is drawn into the lock cylinder (2) by the first magnet (202). At this time, the circumferential limit between the lock cylinder (2) and the lock shell (1) is released. Turning the key (200) can drive the lock cylinder (2) to rotate, thereby unlocking.

2. The lock with good security according to claim 1, characterized in that: The main pin locking assembly (3) includes a first spring (31), a flat ball (32) abutting the upper end of the first spring (31), and a main pin (33) abutting the upper end of the flat ball (32). The lock housing connecting part (11) is provided with a first mounting hole (111) communicating with the mounting cavity (12). The lock cylinder (2) is provided with a second mounting hole (22) communicating with the keyhole (21). The first spring (31) and the flat ball (32) are installed in the first mounting hole (111). The main pin (33) is limited and installed in the second mounting hole (22). The first mounting hole (111) and the second mounting hole (22) are coaxially connected. The diameter of the first mounting hole (111) is the same as the diameter of the second mounting hole (22). The first tooth (201) includes a tooth groove (2011) for pressing and partially accommodating the main pin (33).

3. A lock with good security according to claim 2, characterized in that: The first mounting hole (111) passes through the lock housing connection part (11) and extends out of the lock housing (1). The main ball locking assembly (3) also includes a threaded bolt (34) that is threadedly connected to the lock housing connection part (11) to seal the lower end of the first mounting hole (111). The lower end of the first spring (31) is sleeved on the outer periphery of the bolt (34).

4. A lock with good security according to claim 3, characterized in that: The main ball (33) is shaped like an upward-facing bullet. The main ball locking assembly (3) has six sets of components arranged side by side at equal intervals. The tooth groove (2011) has six sets of components arranged side by side at equal intervals.

5. A lock with good security according to claim 1, characterized in that: The irregular magnetic bead locking assembly (4) includes an irregular magnetic bead (41) and a second spring (42) that abuts against the irregular magnetic bead (41). The inner wall of the mounting cavity (12) is provided with a groove (121) for inserting one end of the irregular magnetic bead (41). The lock cylinder (2) is provided with a third mounting hole (23) that communicates with the keyhole (21). The other end of the irregular magnetic bead (41) is inserted into the third mounting hole (23) and can be moved and extended in the keyhole (21).

6. A lock with good security according to claim 5, characterized in that: The third mounting hole (23) includes a through hole (231) and symmetrical mounting grooves (232) formed on both sides of the through hole (231). The second spring (42) is installed in the mounting groove (232). One end of the second spring (42) abuts against the bottom surface of the mounting groove (232) and the other end abuts against the irregular magnetic bead (41).

7. A lock with good security according to claim 6, characterized in that: The irregular magnetic bead (41) includes a cylindrical part (411) and an elongated part (412) provided at one end of the cylindrical part (411) and extending outward on both sides. The outer diameter of the cylindrical part (411) is adapted to the inner diameter of the through hole (231) so as to facilitate telescopic movement in the through hole (231). The two ends of the elongated part (412) abut against the second springs (42) on both sides and are held in the state of being pushed into the groove (121) under the force of the second springs (42). The end of the cylindrical part (411) facing the key hole (21) forms an installation cavity (413), and a second magnet (414) is installed in the installation cavity (413).

8. A lock with good security according to claim 7, characterized in that: The groove (121) includes two straight sides arranged in parallel at the top and bottom and an arc segment connecting the two ends of the two straight sides respectively. The arc segment is tangent to the straight side, and the two opposite corners at the bottom of the groove (121) are rounded. The long strip (412) is in the shape of a sloping trapezoid that is narrow at the top and wide at the bottom, and the corners of the long strip (412) are rounded.

9. A lock with good security according to claim 1, characterized in that: The locking cylinder (2) includes a cylinder head (24) and a cylinder body (25), and a first anti-drilling pin (6) is installed inside the cylinder head (24).

10. A lock with good security according to claim 1, characterized in that: The lock housing connection part (11) is vertically installed with a second anti-drilling pin (7). There are two second anti-drilling pins (7) arranged in parallel on the left and right sides. The two second anti-drilling pins (7) are located at the lower end of the gall head (24) and the lower end of the gall body (25) near the gall head (24), respectively.

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