Anti-theft lock head, key and lock

Abstract

The invention discloses an anti-theft lock head, a key and a lock, and relates to the technical field of locks.The blade of the anti-theft lock head is provided with a working side wall, and in the locking state that the blade resets, protrudes and is clamped into a groove, the working side wall is configured to abut against the corresponding groove wall of the groove so as to prevent a lock cylinder from rotating; according to the anti-theft lock cylinder, due to the fact that the contour missing parts are arranged on the working side walls of only part of the blades, when rotating torque in the unlocking direction is applied to the lock cylinder in the locking state, the working side walls cannot effectively abut against the corresponding groove walls and / or the inner wall of the lock body, and therefore the anti-theft lock cylinder can be locked. Therefore, the blade cannot be hung by the edge of the groove wall after being shifted to the flush position and always rebounds instantly, the hand feeling feedback that a technical opener relies on pushing operation is thoroughly eliminated in the technical opening process, the technical unlocking probability is reduced, and the safety is improved.

Description

Technical Field

[0001] This invention relates to the field of lock technology, and in particular to an anti-theft lock head, key and lock. Background Technology

[0002] Leaf locks are widely used in high-security applications due to their diverse key patterns and low rate of cross-keying. However, traditional leaf locks still have significant weaknesses when faced with technical opening methods (such as hooking and prying) and forced opening methods (such as twisting and drilling).

[0003] In terms of preventing technical unlocking, traditional leaf locks have an assembly gap between the lock cylinder and the lock body. When technically unlocked, an unauthorized person can first apply a torque to the lock cylinder, causing the leaf blade protrusions to press tightly against one side of the lock body's groove. Then, using a tool, they can move each leaf blade individually until it is flush with the outer diameter of the lock cylinder. Due to the torque and gap, the moved leaf blades are easily "caught" by the edge of the lock body's groove and cannot be reset, thus achieving illegal unlocking. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-theft lock head, key, and lock to solve the problems existing in the prior art and improve the security of the lock.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides an anti-theft lock cylinder, comprising a lock body and a lock cylinder rotatably disposed within the lock body. The lock cylinder has a plurality of radially movable blades and an elastic element for driving the blades to reset. The inner wall of the lock body has a groove for the blades to engage when they protrude. Each blade has a first driving part for engaging with a key. When the key acts on the first driving part, it can overcome the elastic force of the elastic element and cause the blade to retract radially until it is completely removed from the groove. Each blade has a working sidewall. In the locked state, when the blade is reset, protruding, and engaged in the groove, the working sidewall is configured to abut against the corresponding groove wall to prevent the lock cylinder from rotating. Only a portion of the working sidewalls of the blades has a contour-deficient portion. This contour-deficient portion prevents the working sidewall from effectively abutting against the corresponding groove wall and / or the inner wall of the lock body when a rotational torque in the unlocking direction is applied to the lock cylinder in the locked state.

[0006] Preferably, the lock cylinder is further provided with a radially movable anti-torsion plate and an elastic element that drives the anti-torsion plate to protrude out of the outer diameter of the lock cylinder and extend into the groove of the lock body; the anti-torsion plate is provided with a second driving part for cooperating with the key; when the key acts on the second driving part, it can overcome the elastic force of the elastic element and cause the anti-torsion plate to retract radially until it is completely removed from the groove.

[0007] Preferably, the anti-torsion plate has a fracture groove on the lock cylinder on the side facing the keyhole entrance, and the lock tongue of the lock cylinder is located on the other side of the anti-torsion plate; the mechanical strength of the fracture groove is lower than that of the lock cylinder body and the anti-torsion plate.

[0008] Preferably, the first driving part of the blade is a driving groove or protrusion disposed thereon, and the second driving part of the anti-torsion plate is a driving groove or protrusion disposed thereon.

[0009] Preferably, the blades include a first type of blade with the outline missing portion and a second type of blade without the outline missing portion, and the first type of blades and the second type of blades are mixed and arranged in the lock cylinder.

[0010] Preferably, the keyhole entrance of the lock cylinder is provided with an anti-drilling plate.

[0011] Preferably, it also includes a limiting pin, wherein the lock body is provided with a radial pin hole, and the limiting pin is fixed in the pin hole; the outer wall of the lock cylinder is provided with an arc-shaped limiting groove corresponding to the position of the pin hole, and the protruding end of the limiting pin is located in the arc-shaped limiting groove to limit the rotation angle of the lock cylinder relative to the lock body.

[0012] The present invention also provides a key for opening the anti-theft lock as described above.

[0013] Preferably, the key has a first toothed portion for driving the blade and a second toothed portion for driving the anti-torsion plate; the first toothed portion is formed on one side surface of the key in the thickness direction; the second toothed portion is formed on the outer contour of the key in the width direction.

[0014] The present invention also provides a lock comprising the anti-theft lock head as described above.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention provides a contour-deficient portion on the working sidewall of some blades. This contour-deficient portion ensures that, in the locked state, when a rotational torque in the unlocking direction is applied to the lock cylinder, the working sidewall cannot effectively abut against the corresponding groove wall and / or the inner wall of the lock body. This prevents the blades from getting caught on the edge of the groove wall after being moved to the flush position, and they always spring back instantly. This completely eliminates the tactile feedback that the unlocker relies on during the technical unlocking process, thereby reducing the probability of being unlocked by technical means and improving security. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 These are schematic diagrams of the anti-theft lock head and key provided in some embodiments of the present invention; Figure 2 This is an exploded view of the structure of the anti-theft lock head provided in some embodiments of the present invention; Figure 3 This is a schematic diagram of the blade and anti-torsion plate. Figure 4 for Figure 3 A view from another direction; Figure 5 This is a structural diagram of the lock cylinder, limit pins, blades, and anti-torsion plates. Figure 6 This is a schematic diagram of the lock body and the blades; Figure 7 This is a front view of an anti-theft lock cylinder provided in some embodiments of the present invention; Figure 8 for Figure 7 Sectional view along line AA; Figure 9 for Figure 7 BB-direction sectional view; Figure 10 This is a schematic diagram showing the key, some blades, and anti-torsion plate in conjunction. Figure 11 This is a structural schematic diagram of the elastic element, blade, anti-torsion plate, and baffle. In the diagram: 1-Anti-theft lock cylinder; 2-Key; 11-Lock body; 12-Lock cylinder; 13-Leaf; 14-Elastic element; 15-Anti-torsion plate; 16-Limit pin; 17-Block plate.

[0018] 21-First toothed portion; 22-Second toothed portion; 111-Groove; 121-Fracture groove; 122-Arc-shaped limiting groove; 131-First driving part; 132-First type of blade; 133-Second type of blade; 1321-Outline missing part; 151-Second driving part. Detailed Implementation

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

[0020] The purpose of this invention is to provide an anti-theft lock head, key, and lock to solve the problems existing in the prior art and improve the security of the lock.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Those who unlock the following technologies can be understood as thieves.

[0023] The following is combined Figures 1 to 11 The following describes embodiments of the present invention.

[0024] Example 1 This invention provides an anti-theft lock cylinder 1, including a lock body 11 and a lock cylinder 12 rotatably disposed within the lock body 11. The lock cylinder 12 is provided with a plurality of radially movable blades 13 and an elastic element 14 for driving the blades 13 to reset. The inner wall of the lock body 11 is provided with a groove 111 for the blades 13 to engage when they protrude. The blades 13 are provided with a first driving part 131 for cooperating with a key 2. When the key 2 acts on the first driving part 131, it can overcome the elastic force of the elastic element 14 and cause the blades 13 to retract radially until they are completely removed from the groove 111. The blades 13 have a working sidewall ( In the locked state, the working sidewall is a working surface that avoids contact with the groove 111 to prevent forced opening. In the locked state where the blade 13 is reset, protruding and locked into the groove 111, the working sidewall is configured to abut against the corresponding groove wall of the groove 111 to prevent the lock cylinder 12 from rotating. Only a portion of the working sidewall of the blade 13 has a contour missing part 1321, which makes it impossible for the working sidewall to form an effective abutment with the corresponding groove wall and / or the inner wall of the lock body 11 when a rotational torque in the unlocking direction is applied to the lock cylinder 12 in the locked state.

[0025] To make it easier to understand, let's first explain the technical unlocking method.

[0026] In traditional leaf locks, when technically opened, the operator first applies a continuous torque in the unlocking direction to the lock cylinder, causing the protruding parts of all leaf blades to press firmly against the same side wall of the groove 111 in the lock body 11, forming a stable "abutment point." Then, the operator uses a tool to manipulate each leaf blade individually. Whenever a leaf blade is moved to be flush with the outer diameter of the lock cylinder 12, under the continuous torque, it will be slightly "hooked" by the edge of the groove 111 due to the tiny gap between the lock cylinder 12 and the lock body 11, preventing it from immediately springing back. This "hooking" characteristic allows the operator to confirm by touch that the leaf blade has successfully reset, and then proceeds until all leaf blades are leveled, thus achieving illegal opening. The solution of this invention is an innovation made after discovering the above-mentioned problems.

[0027] In this embodiment, a contour-deficient portion 1321 is provided on the working sidewall of only a portion of the blades 13. This feature has dual technical significance, and both are indispensable: Firstly, for ordinary blades without the missing outline 1321, their working sidewalls are complete and continuous, enabling them to form a stable and reliable line contact with the groove wall 111 when the lock cylinder 12 is subjected to unlocking torque. When a skilled locker moves these blades 13 to the flush position, the blades 13 will be reliably caught by the edge of the groove wall under the action of torque, preventing them from immediately resetting. This characteristic is the "expected feedback signal" that the skilled locker relies on to judge the progress—he needs this clear "catch feel" to confirm the success of the operation.

[0028] Secondly, for the special blade with a missing contour portion 1321, its working sidewall has a local depression in the key contact area. This means that no matter how much torque the blade 13 bears, or what the relative angle between the lock cylinder 12 and the lock body 11 is, it cannot form an effective line or surface contact with the groove wall of the groove 111. This is because the missing contour portion 1321 is located precisely in the only effective contact area between the blade 13 and the groove wall under the technical opening condition. When the technical opener moves this type of blade 13 to the flush position and releases the tool, the blade 13 resets outward under the action of the elastic element 14. Its working sidewall cannot be caught by the edge of the groove wall due to the missing contour portion—even if the lock cylinder 12 rotates significantly, the blade 13 cannot establish any abutment force in the missing area to prevent reset, and will inevitably spring back to the convex state instantly.

[0029] The key point is that if all blades 13 have contour-missing portions 1321, then when the lock cylinder 12 is subjected to unlocking torque, the protrusions of all blades 13 cannot form a stable abutment with the groove wall, and the lock cylinder 12 will be in a state of near-free rotation. A skilled picker could then rotate the lock cylinder 12 significantly, causing the non-working sidewalls or other unexpected parts of the blades 13 to form new, undesigned abutment relationships with other areas of the groove 111. This might allow them to find a position where the blades 13 can barely engage through repeated attempts—although inefficient, theoretically, there is still a possibility of skillful picking. In other words, complete missing portions are equivalent to no missing portions at all.

[0030] This embodiment employs a "partial" setting strategy, forcibly retaining a considerable number of ordinary blades. These ordinary blades form a strong and stable abutment with the groove wall at the initial stage of technical opening, strictly limiting the rotational freedom of the lock cylinder 12 to an extremely small gap range. This tiny gap ensures that the contour-deficient portion 1321 on the special blade is always locked within the effective abutment area that corresponds uniquely to the groove wall. Technical openers cannot find a new abutment position for the special blade by rotating the lock cylinder 12 significantly—because the ordinary blades have already "locked" the lock cylinder 12 in its original position.

[0031] Therefore, this embodiment constructs an unbreakable technical breakthrough dilemma: Technicians must rely on the feel of a regular blade being caught to proceed with the operation; But he will never know whether the blade 13 he is currently operating is a regular blade or a special blade; When encountering a special blade, no matter how many times it is repeated, blade 13 can never be caught, and it can never be caught by adjusting the torque or angle. He couldn't decide whether to abandon the current blade 13 or continue trying; He had no way of knowing how many special blades were inside the lock cylinder 12 or where they were located.

[0032] The root of this dilemma lies in the fact that two distinct types of blades, "hookable" and "non-hookable," coexist in the same lock cylinder 12, and technical pickers cannot distinguish between them. Ordinary blades provide the necessary "tactile reference system" for technical picking, while special blades continuously generate contradictory signals within this system. Technical pickers cannot abandon the tactile reliance provided by ordinary blades, nor can they avoid the operational failures caused by special blades. This cognitive conflict within the reference system completely transforms the deterministic process of technical picking, which should be "progressed step by step by feel," into an unsolvable guessing game, rendering technical picking completely ineffective at a practical level.

[0033] Furthermore, this embodiment only modifies the contour of some working sidewalls of the blades 13, without adding any extra parts, without changing the basic structure of the lock body 11 and lock cylinder 12, and without adding assembly processes. Manufacturing costs are almost nonexistent, and it does not affect the feel or reliability of the key 2 when opening the lock. This is an ingenious design that achieves revolutionary anti-theft benefits with extremely low cost and a minimalist structure, possessing significant economic value and promising prospects for industrial applications.

[0034] In some embodiments, the lock cylinder 12 is further provided with a radially movable anti-torsion plate 15 and an elastic member 14 that drives the anti-torsion plate 15 to protrude out of the outer diameter of the lock cylinder 12 and extend into the groove 111 of the lock body 11; the anti-torsion plate 15 is provided with a second driving part 151 for cooperating with the key 2; when the key 2 acts on the second driving part 151, it can overcome the elastic force of the elastic member 14 and cause the anti-torsion plate 15 to retract radially until it is completely removed from the groove 111.

[0035] Because an anti-torsion plate 15, independent of the blade 13, is added inside the lock cylinder 12, and this anti-torsion plate 15 is also kept in a locked state by the elastic element 14, protruding and locked into the groove 111 of the lock body 11, the lock cylinder 12 is doubly locked when the correct key 2 is not inserted. When a technical pick attempts to turn the blade 13, even if the blades 13 are reset one by one, the anti-torsion plate 15 remains locked, and the lock cylinder 12 cannot be rotated. More importantly, the driving path of the anti-torsion plate 15 is completely separated from that of the blade 13, and the corresponding key 2 teeth are located on the outer contour of the key 2 in the width direction. Technical picks cannot act on both the blade 13 and the anti-torsion plate 15 simultaneously through the same operating path, fundamentally blocking the possibility of single-path technical pick. Thus, this embodiment upgrades the traditional "single-point locking" of the blade lock to "dual-system parallel locking," significantly improving the reliability and redundancy of anti-technical pick.

[0036] In another possible implementation, the anti-twist plate 15 can be configured as multiple plates in parallel, that is, multiple anti-twist plates 15 are arranged axially inside the lock cylinder 12, which respectively cooperate with multiple second toothed portions 22 on the key 2, so as to further enhance the difficulty of technical opening.

[0037] In some embodiments, the anti-torsion plate 15 is provided with a fracture groove 121 on the lock cylinder 12 facing the keyhole entrance, and the lock tongue of the lock cylinder 12 is located on the other side of the anti-torsion plate 15; the mechanical strength of the fracture groove 121 is lower than the mechanical strength of the lock cylinder 12 body and the anti-torsion plate 15.

[0038] Because the fracture groove 121 is pre-designed as the part with the lowest mechanical strength in the entire lock cylinder 12 structure, and its position is exactly on the side of the anti-torsion plate 15 facing the keyhole entrance, when a forced entry tool applies a torque to the lock cylinder 12 exceeding the design threshold, the lock cylinder 12 will preferentially fracture at the fracture groove 121. After the fracture occurs, the lock cylinder 12 is divided into a front section and a rear section (including the anti-torsion plate 15 and the bolt drive section). The front section is in a free-spinning state because it loses its rigid connection with the rear section, and the forced entry tool cannot drive the rear section to rotate by twisting the front section; at the same time, the anti-torsion plate 15, because it is located behind the fracture groove 121 and its own strength is much higher than the fracture groove 121, still maintains the locked state with the groove 111 on the lock body 11, and the bolt drive mechanism can never be driven. Thus, this embodiment achieves active anti-forced destruction—not passive resistance, but active unloading of force through controllable fracture and maintenance of the locked state, making forced entry completely ineffective.

[0039] In another possible implementation, the fracture groove 121 does not adopt the annular continuous groove 111, but adopts an intermittent notch structure, that is, multiple discontinuous notches are set in the circumferential direction of the lock cylinder 12, which can also form stress concentration points; in addition, the strength difference between the main body of the lock cylinder 12 and the fracture groove 121 can be achieved by heat treatment or material difference, for example, the main body of the lock cylinder 12 is carburized and quenched, while the fracture groove 121 area is annealed or uses a lower strength material insert.

[0040] In some embodiments, the first driving part 131 of the blade 13 is a driving groove or protrusion disposed thereon, and the second driving part 151 of the anti-torsion plate 15 is a driving groove or protrusion disposed thereon.

[0041] In some embodiments, the blades 13 are divided into two groups. Under the rebound force of their respective corresponding elastic members 14, the two groups of blades 13 move in opposite directions along the radial direction and enter the two grooves 111 of the lock body 11 respectively. In both groups of blades 13, only a portion of the blades 13 have contour missing portions 1321.

[0042] In some embodiments, two baffles 17 are also provided at the keyhole entrance. The two baffles 17 are movably arranged along the radial direction of the lock cylinder 12. Each of the two baffles 17 has an elastic element 14 on its opposite side. Under normal conditions (when the key 2 is not inserted), the two baffles 17 close the keyhole entrance under the elastic force of the elastic element 14. When the key 2 is inserted, it overcomes the elastic force of the elastic element 14 so that the key can enter the lock cylinder 12.

[0043] In some embodiments, the blade 13 includes a first type of blade 132 (i.e., the special blade mentioned above) with a contour missing portion 1321 and a second type of blade 133 (i.e., the ordinary blade mentioned above) without a contour missing portion 1321, and the first type of blade 132 and the second type of blade 133 are mixed and arranged in the lock cylinder 12.

[0044] Because the first type of blade 132 (with a missing outline 1321) and the second type of blade 133 (without a missing outline 1321) are arranged in a mixed manner within the lock cylinder 12, when a technical picker applies a turning torque and attempts to move the blades 13 one by one, they cannot determine by touch or sight whether the currently operated blade 13 is a "lockable" normal blade 13. When operating on the first type of blade 132, the blade 13 will immediately spring back after being moved to the flush position, and the picker will repeatedly try to move the same blade 13 without success; while when operating on the second type of blade 133, the blade 13 may be successfully locked, but the picker cannot know for sure when they will encounter the next first type of blade 132. This strategy of randomly mixing real and fake blades 13 makes every step of the technical picker uncertain, and the picker cannot establish a stable operational expectation, thus greatly prolonging the opening time and rendering the technical picker completely ineffective in practical terms.

[0045] In another possible implementation, the arrangement of the first type of blades 132 and the second type of blades 133 is not limited to random mixing, but can also be arranged periodically (e.g., inserting one first type of blade 132 after every three second type of blades 133) or in segments (e.g., the section near the keyhole entrance is entirely composed of second type of blades 133, the middle section is entirely composed of first type of blades 132, and the end section is mixed). In yet another possible implementation, the outline missing portion 1321 of the first type of blade 132 is not limited to a single notch, but can be set as a multi-level missing structure, that is, there are two or more notches of different depths or positions on the working sidewall of the same blade 13, so that it cannot form an effective abutment under different torque angles. In addition, the proportion of the first type of blades 132 can be arbitrarily selected between 10% and 50% to adapt to application scenarios with different safety levels.

[0046] In some embodiments, a drill-proof plate is provided at the keyhole entrance of the lock cylinder 12. The drill-proof plate only allows tools with a cross-section similar to that of the key 2 to be inserted, thus limiting the strength of the inserted tool.

[0047] Because the anti-drilling plate is made of high-hardness materials (such as cemented carbide, ceramics, etc.) and covers the keyhole entrance, a critical weak point, it directly blocks the drill bit from penetrating the internal structure of the lock cylinder 12 when a forced entry attempt to use a rotary cutting tool such as an electric drill. Upon contact with the anti-drilling plate, the drill bit experiences severe wear, chipping, or deflection due to the difference in material hardness, preventing it from forming an effective hole in the lock cylinder 12. This protects the internal blade 13, anti-torsion plate 15, and the main structure of the lock cylinder 12 from physical damage. This embodiment solves the common drilling attack vulnerability of blade locks at extremely low cost, forming a complete three-dimensional protection system together with the aforementioned anti-technical opening and anti-forced breakage measures.

[0048] In another possible implementation, the anti-drilling plate is not a separate insert, but is integrally formed with the end cap of the lock cylinder 12. That is, the end cap of the lock cylinder 12 is made of a high-hardness material, with irregular through holes only opened at the corresponding keyhole positions. In yet another possible implementation, the anti-drilling plate can be set as a multi-layer composite structure, for example, the surface is an alumina ceramic layer, the middle is a spring steel layer, and the bottom is a soft iron layer, which can resist drilling while also taking into account impact resistance. In addition, the surface of the anti-drilling plate can be provided with annular or radial grooves to further interfere with the centering and feed of the drill bit.

[0049] In some embodiments, a limiting pin 16 is also included. The lock body 11 is provided with a radial pin hole, and the limiting pin 16 is fixed in the pin hole. The outer wall of the lock cylinder 12 is provided with an arc-shaped limiting groove 122 corresponding to the position of the pin hole. The arc-shaped limiting groove 122 is located on the side of the fracture groove 121 away from the keyhole entrance. The protruding end of the limiting pin 16 is located in the arc-shaped limiting groove 122 to limit the rotation angle of the lock cylinder 12 relative to the lock body 11.

[0050] Because the insertion end of the limiting pin 16 is always located within the arc-shaped limiting groove 122 on the outer wall of the lock cylinder 12, the rotation range of the lock cylinder 12 is precisely limited to the central angle range of this arc-shaped groove. This design brings dual technical benefits: firstly, it prevents the user from excessively rotating the lock cylinder 12 when unlocking, avoiding mechanical damage to the internal mechanism; secondly, the clear rotation limit provides the user with clear tactile feedback for opening and closing, improving the user experience. This embodiment achieves secure control over the movement boundaries of the lock cylinder 12 with an extremely simple structure.

[0051] Note that the fit between the elastic element 14 (specifically the spring), each blade 13, and the anti-torsion plate 15 is a conventional structure, and this invention does not improve upon it; therefore, it will not be described in detail.

[0052] Example 2 The present invention also provides a key 2 for opening the anti-theft lock 1 in Embodiment 1.

[0053] The key 2 in this embodiment is a dedicated opening tool fully compatible with the aforementioned anti-theft lock cylinder 1. Because the aforementioned lock cylinder features several innovative structures, including independent locking systems for the blades 13 and anti-torsion plates 15, a contour-missing portion 1321 on the first type of blade 132, and anti-torsion plates 15 with a fracture groove 121 for brute-force protection, ordinary keys 2 or keys 2 without special design cannot open the lock cylinder. The key 2 in this embodiment achieves synchronous and precise reset of all blades 13 through the first toothed portion 21 formed thereon; when the lock cylinder includes the anti-torsion plate 15, the key 2 independently drives the anti-torsion plate 15 through the second toothed portion 22. Therefore, the key 2 in this embodiment is an inseparable complementary product to the aforementioned lock cylinder technology solution; only through their combined operation can a complete anti-theft function be achieved. By protecting the key 2 as an independent product claim, indirect infringement by others through the manufacture and sale of the complementary key 2 can be effectively prevented.

[0054] In some embodiments, the key 2 is provided with a first toothed portion 21 for driving the blade 13 and a second toothed portion 22 for driving the anti-torsion plate 15; the first toothed portion 21 is constructed on one side surface of the key 2 in the thickness direction; the second toothed portion 22 is constructed on the outer contour of the key 2 in the width direction.

[0055] Since the first toothed portion 21 and the second toothed portion 22 are located on two mutually perpendicular spatial planes (the side profile in the thickness direction and the outer contour in the width direction), they are completely isolated from each other in physical space and do not interfere with each other. This layout brings the following key effects: technical unlocking tools (such as hooks and pins) can usually only enter from the front of the keyhole in one direction and cannot act on the teeth on the two perpendicular planes at the same time, thus completely blocking the technical unlocking path; users do not need any additional learning when using it, and the action of inserting key 2 can simultaneously unlock both locking systems, and the operation experience is no different from that of an ordinary key. This embodiment achieves a leapfrog improvement in anti-technical unlocking capability with extremely low cost increment.

[0056] Example 3 The present invention also provides a lock, including the anti-theft lock head 1 in Embodiment 1.

[0057] This embodiment integrates the aforementioned anti-theft lock cylinder 1 into a complete lock product, giving the lock a high level of resistance to both technical and forced entry. Specifically, the lock can take various forms, such as a padlock, mortise lock, motorcycle lock, U-lock, and safe lock. Regardless of the external casing, its core lock cylinder features a "hybrid anti-technical-opening system with a contour-missing portion 1321" and a "dual-path drive anti-forced entry system with an anti-torsion plate 15 and a fracture groove 121." This allows the lock in this embodiment to simultaneously resist various common attack methods, including hook-and-pick opening, drilling, and forced breakage, achieving reliable protection in all weather and various scenarios. Compared to existing products that only optimize a single protection indicator, the lock in this embodiment provides a truly "no-weakness" anti-theft solution.

[0058] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An anti-theft lock cylinder, comprising a lock body and a lock cylinder rotatably disposed within the lock body, the lock cylinder having a plurality of radially movable blades and an elastic element for driving the blades to reset, the inner wall of the lock body having a groove for the blades to engage when protruding, the blades having a first driving part for cooperating with a key, wherein when the key acts on the first driving part, it can overcome the elastic force of the elastic element and cause the blades to retract radially until they are completely removed from the grooves; the blades have a working sidewall, which, in the locked state where the blades are reset, protruding, and engaged in the grooves, is configured to abut against the corresponding groove wall of the groove to prevent the lock cylinder from rotating; characterized in that, Only a portion of the blades has a contour-deficient portion on its working sidewall, which prevents the working sidewall from effectively contacting the corresponding groove wall and / or the inner wall of the lock body when a rotational torque in the unlocking direction is applied to the lock cylinder in the locked state.

2. The anti-theft lock cylinder according to claim 1, characterized in that: The lock cylinder is also provided with a radially movable anti-torsion plate and an elastic element that drives the anti-torsion plate to protrude out of the outer diameter of the lock cylinder and extend into the groove of the lock body; the anti-torsion plate is provided with a second driving part for cooperating with the key; when the key acts on the second driving part, it can overcome the elastic force of the elastic element and cause the anti-torsion plate to retract radially until it is completely removed from the groove.

3. The anti-theft lock cylinder according to claim 2, characterized in that: A fracture groove is provided on the lock cylinder on the side of the anti-torsion plate facing the keyhole entrance, and the lock tongue of the lock cylinder is located on the other side of the anti-torsion plate; the mechanical strength of the fracture groove is lower than that of the lock cylinder body and the anti-torsion plate.

4. The anti-theft lock cylinder according to claim 2, characterized in that: The first driving part of the blade is a driving groove or protrusion disposed thereon, and the second driving part of the anti-torsion plate is a driving groove or protrusion disposed thereon.

5. The anti-theft lock cylinder according to claim 1, characterized in that: The blades include a first type of blade with the outline missing portion and a second type of blade without the outline missing portion, and the first type of blades and the second type of blades are mixed and arranged in the lock cylinder.

6. The anti-theft lock cylinder according to claim 3, characterized in that: The keyhole entrance of the lock cylinder is equipped with an anti-drilling plate.

7. The anti-theft lock cylinder according to claim 3, characterized in that: It also includes a limiting pin, and the lock body is provided with a radial pin hole, and the limiting pin is fixed in the pin hole; the outer wall of the lock cylinder is provided with an arc-shaped limiting groove corresponding to the position of the pin hole, the arc-shaped limiting groove is located on the side of the fracture groove away from the keyhole entrance, and the protruding end of the limiting pin is located in the arc-shaped limiting groove to limit the rotation angle of the lock cylinder relative to the lock body.

8. A key, characterized in that: Used to open the anti-theft lock as described in any one of claims 1 to 7.

9. The key according to claim 8, characterized in that: The key has a first toothed portion for driving the blade and a second toothed portion for driving the anti-torsion plate; the first toothed portion is formed on one side surface of the key in the thickness direction; the second toothed portion is formed on the outer contour of the key in the width direction.

10. A lock, characterized in that: It includes the anti-theft lock cylinder as described in any one of claims 1-7.

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