Lock with good anti-theft performance
By combining the obliquely staggered bead locking assembly with the side bead and horizontal bar locking assembly, the problem of insufficient anti-theft performance of the lock cylinder is solved, and a lock design with simple structure and good anti-theft performance is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN CITY JIXIN CORE LOCK CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-05
AI Technical Summary
Existing lock cylinders have shortcomings in terms of anti-theft performance. In particular, single-bead structures are easily picked by technical means, while double-bead structures are complex and costly, making it difficult to meet security requirements.
The system employs a diagonally staggered bead locking assembly, combined with side beads and horizontal bar locking assemblies. Through diagonal movement trajectories and multiple sets of codes, it increases the difficulty of unlocking and key duplication.
It improves the anti-theft performance of the lock cylinder, increases the difficulty of key duplication and unauthorized opening, while maintaining a simple structure and reducing production costs.
Smart Images
Figure CN224200401U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of locks, specifically to a lock with good anti-theft performance. Background Technology
[0002] In the lock industry, the lock cylinder, as a core component for ensuring security, has always been a key focus of research and development in terms of its anti-theft performance. Currently, the anti-theft structural designs of commonly available lock cylinders can be mainly divided into the following two categories:
[0003] The first type is the lock cylinder design that uses a single type of bead. This type of lock cylinder typically uses one of the following bead types as its core anti-theft component: float bead, side bead, pin tumbler, or master pin tumbler. Due to its simple structure and fewer parts, its manufacturing cost is low, and it is relatively easy to assemble and use. However, this single-bead design has significant security vulnerabilities. Because of its highly regular internal structure, criminals can easily open it using specialized tools and techniques; at the same time, because the correspondence between the key teeth and the bead structure is relatively simple, the key is easy to copy, resulting in poor anti-theft performance of this type of lock cylinder, which is difficult to meet the ever-increasing security demands.
[0004] The second type is a lock cylinder scheme that uses a combination of two types of beads. Common combinations include side beads and pins, or side beads and floats. This type of scheme enhances the anti-theft performance of the lock cylinder to a certain extent. Its principle is that the two types of beads cooperate in different positions and with different movements, increasing the complexity of unlocking. However, this scheme also has many drawbacks: First, the complex structure and increased number of parts lead to a cumbersome manufacturing process, increasing processing difficulty and cost, and making installation more difficult, thus reducing production efficiency. Second, in this type of scheme, the side beads are usually drilled and installed on the side of the lock cylinder, while the pins or floats are generally drilled vertically and installed at the top or bottom of the lock cylinder. Furthermore, the pins or floats in the same row are of the same size and structure, all moving vertically radially within the holes. This structural layout has been used for a long time and is well-known to criminals. Because the correspondence between the key's keyholes and the bead structure is regular, criminals can easily unlock the lock using specialized tools or techniques based on the conventional lock cylinder layout. At the same time, key duplication is also relatively easy, failing to fundamentally solve the problem of insufficient anti-theft performance of the lock cylinder.
[0005] Therefore, how to improve the anti-theft performance of the lock cylinder and increase the difficulty of key duplication and illegal opening while ensuring a simple structure and convenient manufacturing has become an important issue that needs to be addressed by those skilled in the art. Utility Model Content
[0006] This invention overcomes the shortcomings of the above-mentioned technologies and provides a lock with good anti-theft performance.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A lock with good anti-theft performance includes a lock cylinder and a key. The lock cylinder includes a lock shell, a lock cylinder installed inside the lock shell, and a latch mounted on the lock shell and connected to the lock cylinder. The lock cylinder has a keyhole for key insertion through an axial direction. The lock shell includes a lock shell connecting part and a mounting cavity for installing the lock cylinder. At least two sets of obliquely staggered bead locking components are also provided between the lock shell and the lock cylinder. The key has corresponding toothed holes that mate with the bead locking components. When no key is inserted into the keyhole of the lock cylinder or the key is inserted incorrectly, the front end of the bead locking component pushes into the lock cylinder and into the keyhole, thereby locking. When the key is gradually inserted into the lock cylinder along the keyhole, the bead locking component is pushed into the corresponding toothed hole by the key. At this time, turning the key can drive the lock cylinder to rotate and unlock.
[0009] Furthermore, the inclined ball locking assembly includes a first spring, a flat ball abutting the upper end of the first spring, and a main ball abutting the upper end of the flat ball. The lock housing connecting part is provided with first mounting holes that communicate with the mounting cavity in an oblique staggered manner. The lock cylinder is provided with second mounting holes that communicate with the keyhole in an oblique staggered manner. The first spring and the flat ball are installed in the first mounting holes, and the main ball is limited and installed in the second mounting holes. The first mounting holes and the second mounting holes are coaxially connected. The diameter of the first mounting hole is the same as the lower end diameter of the second mounting hole, and the diameter of the flat ball is the same as the lower end diameter of the main ball.
[0010] Furthermore, the second mounting hole includes a limiting hole and a movable hole. The diameter of the limiting hole is larger than the diameter of the movable hole, thereby forming a limiting inner ring at the connection between the two. The main ball is bullet-shaped and includes a limiting end movably disposed in the limiting hole and a movable end movably disposed in the movable hole. The connection between the limiting end and the movable end forms a limiting outer ring.
[0011] Furthermore, the inclined bead locking assembly is provided in three to six sets, and the corresponding toothed holes are provided in three to six sets.
[0012] Furthermore, the diameter and depth of each of the said perforations are different.
[0013] Furthermore, the lock cylinder also includes a side bead locking assembly and a horizontal bar locking assembly that works in conjunction with the side bead locking assembly to lock the lock cylinder. When no key is inserted into the lock cylinder or the key is inserted incorrectly, both the side bead locking assembly and the horizontal bar locking assembly are in a locked state. When the correct key is inserted into the lock cylinder, the side bead locking assembly is activated, thereby unlocking the horizontal bar locking assembly and unlocking the lock.
[0014] Furthermore, the side bead locking assembly is provided with at least two sets. The side bead locking assembly includes a side bead hole opened on one of the left and right side walls of the lock cylinder, a second spring installed at the bottom of the side bead hole, and a side bead installed in the side bead hole and one end abutting against the second spring. The upper side of the side bead is provided with a first groove facing upward and a top foot extending downward at the lower end. The key is provided with a serpentine groove that cooperates with the top foot.
[0015] Furthermore, the horizontal bar locking assembly includes a horizontal bar groove on the upper side wall of the lock cylinder that communicates with the side bead hole, a horizontal bar inserted in the horizontal bar groove that can move radially within the horizontal bar groove, a third mounting hole recessed at the bottom of both ends of the horizontal bar groove, a third spring installed in the third mounting hole, and the horizontal bar includes protrusions at both ends, the lower ends of the protrusions at both ends respectively abutting against the third springs at both ends.
[0016] Furthermore, the inner wall of the mounting cavity is recessed with a long groove for limiting the horizontal grid and thus restricting the rotation of the lock cylinder. The cross-section of the long groove is arc-shaped, and the upper end of the horizontal grid is provided with an arc-shaped strip that matches the shape of the long groove.
[0017] Furthermore, an anti-drilling plate is inserted into the lock cylinder, an anti-drilling pin is inserted into the lock shell, and a second groove is also provided on the upper side of the side bead, the second groove being located to the left of the first groove and its depth being lower than the depth of the first groove.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] This case utilizes a diagonally staggered bead locking assembly, altering the traditional vertical radial movement of beads within the holes. The diagonal movement trajectory of the bead locking assembly breaks the planar locking structure of traditional lock cylinders, preventing thieves from simultaneously unlocking multiple sets of bead locking assemblies using conventional unidirectional tools such as pry bars or hooks. This increases anti-theft performance and makes it difficult to pick technically. This diagonally staggered bead locking assembly prevents thieves from using tactile feedback to attempt unlocking in one direction; they must simultaneously overcome the resistance of multiple bead locking assemblies and various coding combinations, making technical unlocking extremely difficult. Because the diagonal bead locking assembly changes the traditional vertical radial movement path, the key's corresponding tooth hole must match the tilt angle of the bead locking assembly. This necessitates precise measurement of the angle and tooth depth when copying the key, increasing the difficulty of duplication. Compared to traditional single-bead lock cylinders, this design offers better security; compared to traditional double-bead lock cylinders, the structure is simpler and also offers better security. 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 one of the structural schematic diagrams of the inclined ball locking assembly in this case.
[0022] Figure 3 This is the second structural schematic diagram of the inclined ball locking assembly in this case.
[0023] Figure 4 This is the front view of the lock case 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 a bottom view of the lock in this case.
[0026] Figure 7 This is a structural diagram of the key in this case.
[0027] Figure 8 This is one of the combination state diagrams after the key is inserted into the lock cylinder in this case.
[0028] Figure 9 This is the case Figure 8 A cross-sectional view along the BB direction.
[0029] Figure 10 This is the second diagram showing the combined state of the lock cylinder after the key is inserted in this case.
[0030] Figure 11 This is the case Figure 10 A cross-sectional view along the CC direction.
[0031] Figure 12 This is a schematic diagram of the side bead structure in this case. Detailed Implementation
[0032] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art:
[0033] like Figures 1 to 12 As shown, this case discloses a lock with good anti-theft performance, including a lock cylinder 100 and a key 200. The lock cylinder 100 includes a lock shell 1, a lock cylinder 2 installed inside the lock shell 1, and a latch 8 installed on the lock shell 1 and connected to one end of the lock cylinder 2. A keyhole 21 for inserting the key 200 is axially opened on the lock cylinder 2. The lock shell 1 includes a lock shell connecting part 11 and a mounting cavity 12 for installing the lock cylinder 2. At least two sets of obliquely staggered bead locking assemblies 3 are also provided between the lock shell 1 and the lock cylinder 2. For a detailed illustration of the obliquely staggered arrangement, please refer to [reference needed]. Figure 2 , Figure 3As shown in the diagram of the inclined ball locking assembly 3, each inclined ball locking assembly 3 has the same tilt angle, and adjacent inclined ball locking assemblies 3 are spaced at the same interval, thus forming a diagonally staggered arrangement. In specific implementation, the tilt angle of each inclined ball locking assembly 3 is 45 degrees to form a spatial cross-shaped locking mechanism, which also facilitates handling the resistance of the inclined ball locking assemblies in multiple directions and various coding combinations. Correspondingly, the key 200 has corresponding toothed holes 201 that mate with the inclined ball locking assemblies 3, so as to unlock them one by one. Specifically, when the key 200 is not inserted into the keyhole 21 of the lock cylinder 2 or the key 200 is inserted incorrectly, the front end of the inclined ball locking assembly 3 pushes into the lock cylinder 2 and into the keyhole 21, thereby locking; when the key 200 is gradually inserted into the lock cylinder 2 along the keyhole 21, the inclined ball locking assembly 3 is pushed into the corresponding toothed hole 201 by the key 200. At this time, turning the key 200 can drive the lock cylinder 2 to rotate and unlock.
[0034] As described above, this case utilizes at least two sets of diagonally staggered bead locking components 3 between the lock shell 1 and the lock cylinder 2. This structure adapts and improves the internal structure of the lock shell 1 and the lock cylinder 2, differing from conventional lock cylinder structures on the market. This enhances anti-theft performance while maintaining a simple structure and ease of manufacturing. Furthermore, the diagonally staggered bead locking components 3 alter the overall internal structure of the lock cylinder 100 and the structure of the key 200's keyhole 201, increasing the difficulty for unscrupulous individuals to illegally open the lock and duplicate the key compared to conventional designs.
[0035] Specifically, refer to Figures 1-11 As shown, the inclined ball locking assembly 3 includes a first spring 31, a flat ball 32 abutting the upper end of the first spring 31, and a main ball 33 abutting the upper end of the flat ball 32. In specific implementation, the first spring 31 is a helical compression spring, ensuring that the flat ball 32 is always subjected to an upward thrust, providing continuous elastic force, driving the flat ball 32 to move upward, and indirectly pushing the main ball 33 into the locking position. Through the linkage of the first spring 31, the flat ball 32, and the main ball 33, the locking state is reliably guaranteed under stable elastic force output, avoiding accidental unlocking due to vibration or external force. The lock housing connecting part 11 has first mounting holes 111 that communicate with the mounting cavity 12, which are diagonally staggered. The lock cylinder 2 has second mounting holes 22 that communicate with the keyhole 21, which are diagonally staggered. The first spring 31 and the flat ball 32 are installed in the first mounting holes 111. The main ball 33 is limited and installed in the second mounting holes 22. For a detailed illustration of the diagonally staggered arrangement of the first mounting holes 111 and the second mounting holes 22, please refer to [reference needed]. Figure 5 , Figure 6 , Figure 9As shown, its tilt angle is consistent with that of the inclined ball locking assembly 3, and is preferably 45 degrees. The first mounting hole 111 and the second mounting hole 22 provide an oblique movement trajectory for the inclined ball locking assembly 3, making the movement direction of the flat ball 32 and the main ball 33 different from the traditional vertical diameter movement. The obliquely set channel increases the difficulty of inserting illegal tools, and non-matching keys cannot simultaneously reach all inclined ball locking assemblies 3. The first mounting hole 111 and the second mounting hole 22 are coaxially connected. This coaxial connection design can effectively ensure the installation accuracy of the inclined ball locking assembly 3 and avoid jamming caused by hole position deviation. The diameter of the first mounting hole 111 is the same as the lower diameter of the second mounting hole 22, and the diameter of the flat ball 32 is the same as the lower diameter of the main ball 33.
[0036] That is to say, the upper end of the main ball 33 is limited in the first mounting hole 111 and will not come out of the second mounting hole 22, while its lower end can extend into the first mounting hole 111, and the flat ball 32 can extend upward into the second mounting hole 22.
[0037] When the lock cylinder 100 is in the locked state, under the elastic force of the first spring 31, the first spring 31 drives the flat ball 32 to lift the main ball 33, and the front end of the flat ball 32 rises into the second mounting hole 22. The main ball 33 extends upward from the second mounting hole 22 into the keyhole 21. Because the flat ball 32 is simultaneously locked in the first mounting hole 111 and the second mounting hole 22, the lock cylinder 2 is locked. When unlocking is required, as the key 200 is inserted, the main ball 33 is pressed down until it is pressed into the corresponding mating toothed hole 201. At this time, the flat ball 32 is completely locked in the first mounting hole 111, and the main ball 33 is completely locked in the second mounting hole 22. At this time, the main ball 33 and the flat ball 32 can disengage from the abutting state. Turning the key 200 will drive the lock cylinder 2 to rotate, and then the main ball 33 and the flat ball 32 will separate, realizing unlocking.
[0038] Thus, when criminals use an incorrect key 200 or other foreign objects to illegally open the lock cylinder 2, the main pin 33 may be over-pressed into the second mounting hole 22 or not retracted long enough. If the main pin 33 is over-pressed, its lower end will enter the first mounting hole 111, simultaneously locking both the first and second mounting holes 111 and 22, thus locking the lock cylinder 2. If the main pin 33 is not retracted long enough, its upper end will lock into the second mounting hole 22, simultaneously locking both the first and second mounting holes 111 and 222, thus locking the lock cylinder 2. This linkage mechanism provides good anti-theft performance, high security, and makes key duplication difficult.
[0039] Furthermore, continue to refer to Figures 1-11 As shown, please refer to the details separately. Figure 9 As shown. The second mounting hole 22 includes a limiting hole 221 and a movable hole 222. The diameter of the limiting hole 221 is larger than the diameter of the movable hole 222, thus forming a limiting inner ring 223 at the connection between the two. In specific implementation, the main pin 33 is bullet-shaped, that is, the movable end 332 of the main pin 33 is the tip of the bullet. The bullet-shaped movable end 332 reduces the contact area with the keyhole 21, increasing the difficulty of applying force by illegal tools. The main pin 33 includes a limiting end 331 movably disposed in the limiting hole 221 and a movable end 332 movably disposed in the movable hole 222. The connection between the limiting end 331 and the movable end 332 forms a limiting outer ring 333. In specific implementation, in this embodiment, the diameter of the first mounting hole 111 is the same as the diameter of the limiting hole 221 of the second mounting hole 22, and the diameter of the flat ball 32 is the same as the diameter of the limiting end of the main pin 33. By cooperating with the inner limiting ring 223 and the outer limiting ring 333, the axial displacement range of the main pin 33 is precisely limited, improving the locking and unlocking accuracy of the lock. The stroke of the main pin 33 is strictly limited within a safe range, preventing the main pin 33 from excessively ejecting due to excessive spring force of the first spring 31 or from completely retracting due to external impact. This ensures that the movable end 332 of the main pin 33 always maintains a fixed extension length when the lock cylinder 100 is locked, thus improving the stability of the lock in this case.
[0040] Furthermore, to ensure good anti-theft performance while avoiding an overly complex production and assembly process, in specific implementation, the inclined bead locking assembly 3 is provided with three to six sets, and the corresponding toothed holes 201 are provided with three to six corresponding sets. Preferably, in this case, the inclined bead locking assembly 3 is provided with six sets, and the corresponding toothed holes 201 are provided with six corresponding sets. Providing more inclined bead locking assemblies 3 and toothed holes 201 corresponds to more different unlocking structures, increasing the difficulty of unlocking. Multiple sets of inclined bead locking assemblies 3 simultaneously engage the lock cylinder 2 and the lock shell 1; illegal opening requires the simultaneous release of all sets of locks, which cannot be accomplished with a single-direction tool, thus exponentially increasing the technical difficulty of unlocking.
[0041] like Figure 7 As shown, specifically, to achieve better anti-theft performance in conjunction with the angled bead locking component 3, the diameter and depth of each toothed hole 201 are different. Because the differentiated design of each toothed hole 201 breaks the regular coding of the equidistant and uniformly deep toothed patterns in traditional lock cylinders, it forms an irregular random coding system, making it difficult for criminals to crack through trial and error, thus increasing the difficulty of technical unlocking. This also makes copying the key 200 more difficult, because key copying requires simultaneously obtaining the diameter and depth parameters of all toothed holes, cutting off the illegal copying path at the source.
[0042] On the other hand, the different depths of the toothed holes 201 require different force and stroke when inserting the key 200. When a mismatched key 200 is inserted, due to the diameter or depth deviation, it is impossible to accurately press down all the main pins 33, causing the lock cylinder 2 and the lock shell 1 to remain stuck, forming obvious jamming feedback, reminding the user of abnormal operation; at the same time, it also makes non-technical opening more difficult.
[0043] like Figures 1-12 As shown in the preferred embodiment of this utility model, the lock cylinder 100 further includes a side bead locking assembly 4 and a horizontal bar locking assembly 5 that cooperates with the side bead locking assembly 4 to lock the lock cylinder 2. When the key 200 is not inserted into the lock cylinder 2 or the key 200 is inserted incorrectly, both the side bead locking assembly 4 and the horizontal bar locking assembly 5 are in a locked state. When the correct key 200 is inserted into the lock cylinder 2, the side bead locking assembly 4 is activated, thereby unlocking the horizontal bar locking assembly 5 and unlocking the lock. By having the oblique bead locking assembly 3, the side bead locking assembly 4, and the horizontal bar locking assembly 5 work independently and in cooperation with each other, the lock cylinder 2 cannot rotate if any one of the components is not unlocked; when the correct key 200 is inserted, a three-level unlocking process is required, which greatly improves the anti-theft performance of the lock in this case.
[0044] Specifically, such as Figure 1 , Figures 7-12 As shown, the side bead locking assembly 4 is provided with at least two sets. The side bead locking assembly 4 includes a side bead hole 41 opened on one side wall of the left or right end of the lock cylinder 2, a second spring 42 installed at the bottom of the side bead hole 41, and a side bead 43 installed in the side bead hole 41 and one end abutting against the second spring 42. The upper side of the side bead 43 is provided with a first groove 431 facing upward and the lower end is provided with a top foot 432 extending downward. The key 200 is provided with a serpentine groove 202 that cooperates with the top foot 432.
[0045] In practical implementation, to ensure the security of the lock, the user can set three to six sets of side bead locking components 4. In this case, to facilitate production and save production costs, it is preferable to set five sets of side bead locking components 4. The top foot 432 is used to cooperate with the serpentine groove of the key and slide in the serpentine groove.
[0046] like Figure 1 , Figures 7-12 As shown, specifically, the horizontal bar locking assembly 5 includes a horizontal bar groove 51 that is opened on the upper side wall of the lock cylinder 2 and communicates with the side bead hole 41, and a horizontal bar 52 that is inserted into the horizontal bar groove 51 and can move radially within the horizontal bar groove 51. The bottom of both ends of the horizontal bar groove 51 is recessed and provided with a third mounting hole 53. A third spring 54 is installed in the third mounting hole 53. The horizontal bar 52 includes a protrusion 521 provided at both ends. The lower ends of the protrusions 521 at both ends respectively abut against the third springs 54 at both ends. The provision of the protrusions 521 facilitates the abutment between the horizontal bar 52 and the third spring 54.
[0047] As described above, based on the description of the structure of the side bead locking assembly 4 and the horizontal bar locking assembly 5, when the key 200 is not inserted into the lock cylinder 2 or an incorrect key 200 is inserted, the side bead 43 cannot be driven to move correctly. The horizontal bar 52 is in a raised state under the force of the third spring and cannot descend to cooperate with the first groove 431 of the side bead, so that the lock cylinder 2 is in a stationary locked state, thereby achieving locking. When the key is inserted, the top foot moves along the direction of the serpentine groove in the serpentine groove, and the side bead 43 moves in the side bead hole 41 along the serpentine groove 202 on the key 200. When the key is finally inserted to the bottom, several first grooves 431 will be in a straight line, forming a receiving groove for accommodating the horizontal bar 52. Then the lock cylinder 2 is rotated, and the horizontal bar 52 contacts and squeezes the inner wall of the lock shell 1, causing the horizontal bar 52 to fall into the receiving groove, thereby causing the lock cylinder 2 to rotate relative to the lock shell 1 and achieve unlocking. When the key 200 is removed, the second spring 42 drives the side bead 43 to reset, causing several first grooves 431 to return to a state where they are not on a straight line. At the same time, the third spring 52 drives the horizontal bar 52 to reset, and the two complete the locking reset.
[0048] Through the dynamic cooperation of the first irregular bead locking component 4 and the horizontal bar locking component 5, and the spring reset mechanism, a logically rigorous three-dimensional locking and reliable reset system is constructed. This linkage mechanism of dynamic alignment, precise cooperation, and automatic reset not only improves the unlocking complexity through the dual verification of the trajectory of the side bead 43 and the position of the horizontal bar 52, but also ensures the stability of the locked state by the rigid reset of the spring system. From a structural logic perspective, it cuts off the cracking path of traditional locks that rely on a single movement trajectory or static engagement, and significantly enhances the uniqueness of the lock in the unlocking process and the reliability of the locked state.
[0049] Furthermore, referring to Figure 1 , Figure 8 , Figure 9 As shown, a long groove 121 is recessed on the inner wall of the mounting cavity 12 to limit the rotation of the lock cylinder 2 by restricting the horizontal bar 52. The cross-section of the long groove 121 is arc-shaped, and the upper end of the horizontal bar 52 is provided with an arc-shaped strip 522 that matches the shape of the long groove 121. In specific implementation, the arc-shaped long groove 121 facilitates the easy rotation of the lock cylinder 2 when the correct key 200 is used, allowing the horizontal bar 52 to be squeezed out of the long groove 121.
[0050] When the lock cylinder 2 is illegally pried open, the arc-shaped bar 522 of the horizontal bar 52 and the arc surface of the long groove 121 form a rigid contact, and the force is evenly distributed to the entire groove wall to prevent structural damage caused by single-point force. The depth of the long groove 121 matches the height of the horizontal bar 52. When violently rotated, the two form a circumferential limiting cooperation, and the horizontal bar 52 cannot completely disengage from the long groove 121. The lock cylinder 2 is in the state, which can effectively prevent the lock cylinder 100 from being illegally opened.
[0051] When the key 200 is not inserted into the cylinder 2 or an incorrect key 200 is inserted, the side bead 43 cannot be driven to move correctly. The horizontal bar 52 is in a raised state under the force of the third spring 52 and cannot descend to engage with the first groove 431 of the side bead 43. Nor can the several first grooves 431 be aligned to form a receiving groove for the horizontal bar 52. Therefore, when the cylinder 2 is rotated until the horizontal bar 52 is engaged in the long groove 121 on the inner wall of the lock case 1 under the elastic force of the third spring 54, the cylinder 2 cannot rotate, preventing illegal opening. When the correct key is inserted, the horizontal bar 52 can be squeezed out of the long groove 121, and then the lower end of the horizontal bar 52 engages in the receiving groove formed by the several first grooves 431, without restricting the rotation of the cylinder 2, allowing normal unlocking.
[0052] Reference Figure 1 , Figure 10-12 As shown, in this embodiment, an anti-drilling plate 6 is inserted into the lock cylinder 2. The anti-drilling plate 6 directly protects the lock cylinder 2, preventing criminals from using drill bits or other tools to illegally penetrate the lock cylinder 2 through the keyhole 21 and cause illegal damage. An anti-drilling pin 7 is inserted into the lock shell 1, protecting the lock shell 1 and preventing criminals from using drill bits or other tools to illegally penetrate the lock cylinder 2 through the lock shell 1 and cause illegal damage. By setting the anti-drilling plate 6 and the anti-drilling pin 7, the overall anti-drilling performance of the lock cylinder 100 is improved, further enhancing security. A second groove 423 is also provided on the upper side of the side bead 43. The second groove 423 serves to prevent prying and picking during illegal opening, interfering with criminals using tools to pry open the side bead 43. The second groove 423 is located to the left of the first groove 431 and its depth is lower than that of the first groove 431. In the conventional design of the prior art, one end of the lock cylinder 100 is provided with the lock cylinder 2, and the other end is provided with components such as an internal knob or tail gauge. In a specific implementation, preferably, in this embodiment, two lock shells 1 and lock cylinders 2 are symmetrically arranged on the left and right sides with the lever 8 as the axis. That is, in this embodiment, the lock shell 1 is designed to be detachable on both sides, and the lock cylinder in this case is a double-lock cylinder with double lock cylinders 2, with lock cylinders 2 at both ends. The door can be opened with a key from both sides, which is convenient to use and has a wide range of applications. Of course, in another embodiment, the lock shell 1 can also be in a non-detachable state, and the lock cylinders 2 can still be symmetrically connected to both sides of the lever 8. Of course, when the embodiment has double lock cylinders 2, it also includes all the components and necessary structures that match the lock cylinders 2 as described above, which will not be repeated here.
[0053] As stated above, this case protects a lock with good anti-theft performance, and all technical solutions that are the same as or similar to those in this case should be considered to fall within the scope of protection of this case.
Claims
1. A lock with good anti-theft performance, characterized in that: The lock includes a lock cylinder (100) and a key (200). The lock cylinder (100) includes a lock shell (1), a lock cylinder (2) installed inside the lock shell (1), and a latch (8) connected to the lock cylinder (2) and installed on the lock shell (1). The lock cylinder (2) has a keyhole (21) axially extending through it for inserting the key (200). The lock shell (1) includes a lock shell connecting part (11) and a mounting cavity (12) for installing the lock cylinder (2). The lock is characterized in that at least two sets of obliquely staggered bead locking assemblies (3) are further provided between the lock shell (1) and the lock cylinder (2). The key... (200) has a toothed hole (201) that corresponds to the inclined ball locking assembly (3); when the key (200) is not inserted into the keyhole (21) of the lock cylinder (2) or the key (200) is inserted incorrectly, the front end of the inclined ball locking assembly (3) pushes into the lock cylinder (2) and into the keyhole (21), thereby achieving locking; when the key (200) is gradually inserted into the lock cylinder (2) along the keyhole (21), the inclined ball locking assembly (3) is pushed into the corresponding toothed hole (201) by the key (200), and at this time, turning the key (200) can drive the lock cylinder (2) to rotate to achieve unlocking.
2. The lock with good anti-theft performance according to claim 1, characterized in that: The inclined ball locking assembly (3) includes a first spring (31), a flat ball (32) abutting the upper end of the first spring (31), and a main ball (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) in an oblique staggered manner. The lock cylinder (2) is provided with a second mounting hole (22) communicating with the keyhole (21) in an oblique staggered manner. The first spring (31) and the flat ball (32) are installed in the first mounting hole (111). The main ball (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 lower diameter of the second mounting hole (22). The diameter of the flat ball (32) is the same as the lower diameter of the main ball (33).
3. A lock with good anti-theft performance according to claim 2, characterized in that: The second mounting hole (22) includes a limiting hole (221) and a movable hole (222). The diameter of the limiting hole (221) is larger than the diameter of the movable hole (222), thereby forming a limiting inner ring (223) at the connection between the two. The main ball (33) is bullet-shaped. The main ball (33) includes a limiting end (331) movably disposed in the limiting hole (221) and a movable end (332) movably disposed in the movable hole (222). The connection between the limiting end (331) and the movable end (332) forms a limiting outer ring (333).
4. A lock with good anti-theft performance according to claim 1, characterized in that: The inclined bead locking assembly (3) is provided with three to six sets, and the toothed hole (201) is correspondingly provided with three to six.
5. A lock with good anti-theft performance according to claim 1, characterized in that: The diameter and depth of each of the aforementioned perforations (201) are different.
6. A lock with good anti-theft performance according to any one of claims 1-5, characterized in that: The lock cylinder (100) also includes a side bead locking assembly (4) and a horizontal bar locking assembly (5) that works with the side bead locking assembly (4) to lock the lock cylinder (2). When no key (200) is inserted into the lock cylinder (2) or the key (200) is inserted incorrectly, both the side bead locking assembly (4) and the horizontal bar locking assembly (5) are locked. When the correct key (200) is inserted into the lock cylinder (2), the side bead locking assembly (4) is activated, thereby unlocking the horizontal bar locking assembly (5) and unlocking the lock.
7. A lock with good anti-theft performance according to claim 6, characterized in that: The side bead locking assembly (4) is provided with at least two sets. The side bead locking assembly (4) includes a side bead hole (41) opened on one side wall of the left or right end of the lock cylinder (2), a second spring (42) installed at the bottom of the side bead hole (41), and a side bead (43) installed in the side bead hole (41) and abutting one end with the second spring (42). The side bead (43) has a first groove (431) opened on the upper side facing upward and a top foot (432) extended downward at the lower end. The key (200) has a serpentine groove (202) that cooperates with the top foot (432).
8. A lock with good anti-theft performance according to claim 7, characterized in that: The horizontal bar locking assembly (5) includes a horizontal bar groove (51) connected to the side bead hole (41) on the upper side wall of the lock cylinder (2), and a horizontal bar (52) inserted in the horizontal bar groove (51) that can move radially within the horizontal bar groove (51). The bottom of both ends of the horizontal bar groove (51) is recessed and provided with a third mounting hole (53). A third spring (54) is installed in the third mounting hole (53). The horizontal bar (52) includes a protrusion (521) at both ends. The lower ends of the protrusion (521) at both ends abut against the third spring (54) at both ends.
9. A lock with good anti-theft performance according to claim 8, characterized in that: The inner wall of the mounting cavity (12) is recessed with a long groove (121) for limiting the horizontal grid (52) and thus restricting the rotation of the lock cylinder (2). The cross-section of the long groove (121) is arc-shaped, and the upper end of the horizontal grid (52) is provided with an arc-shaped strip (522) that matches the shape of the long groove (121).
10. A lock with good anti-theft performance according to claim 9, characterized in that: The lock cylinder (2) is provided with an anti-drilling plate (6), the lock shell (1) is provided with an anti-drilling pin (7), and the upper side of the side bead (43) is provided with a second groove (423) facing upward. The second groove (423) is located to the left of the first groove (431) and its depth is lower than the depth of the first groove (431).