Anti-theft lock cylinder with broken toothed ring, key and intelligent door lock

Abstract

The utility model discloses a kind of theft-preventing lock lock cylinder, key and intelligent door lock with broken-off tooth, belong to lock technical field.The lock cylinder includes lock shell, lock core and matched key;Lock core is equipped with V-shaped keyhole, and key is formed by tooth and reinforcing rib that are connected by root and completely separated.Tooth forms broken-off area with first / last tooth height of zero at corresponding door marble, and the lower end of door marble reaches keyhole bottom surface, and zero gap cooperation is formed between door marble and keyhole bottom surface, and the space that can be provided for hooking, alternative hook operation is completely eliminated, and the cooperation tolerance of door marble hole and door marble is less than the cooperation tolerance of remaining marble hole and its corresponding marble, when door marble is in being torsion alternative, remaining marble is in loose state, and the critical point position of marble cannot be determined, so that technical opening cannot be realized.The utility model completely eliminates tool operating space, makes technical opening probability drop to zero, with the advantages of simple structure, low cost, strong compatibility.

Description

Technical Field

[0001] This utility model relates to the field of lock security technology, specifically to a toothed detachable anti-theft lock cylinder and its key that achieves zero gap through a detachment zone structure. Background Technology

[0002] Currently, most mechanical locks worldwide use a combined key structure of "toothed rib + reinforcing rib". This structure ensures that the depth of the toothed rib is only about 1 / 3 of the key height, while the remaining 2 / 3 of the reinforcing rib creates an operating space within the keyhole for tools such as picks and levers, allowing even complex lock cylinders to be opened technically. While the V-shaped key, which has emerged in recent years, separates the reinforcing rib from the toothed rib, the toothed rib still does not extend to the base of the key, allowing tools to still find operating space and a fulcrum at the end; furthermore, the length and tolerance design of the door pins are still not entirely reasonable.

[0003] (1) Core structural defects of traditional locks Most current mainstream pin tumbler locks use a key structure with a single, integrated upper and lower key assembly consisting of a key ring and a reinforcing rib. The reinforcing rib and key ring form a single, integrated unit, creating the technical opening mechanism – a common design flaw in locks. In this structure, the key ring carries the key and engages with the pins within the lock cylinder; the depth of the key ring's grooves is typically only 1 / 3 of the key's height, while the reinforcing rib occupies 2 / 3 of the key's height to ensure mechanical strength. However, this also creates a dead zone or operating space in the keyhole, allowing for technical opening with tools. The base of the lower pin dangles from the keyhole, providing this space for tools to pick the lock. Picking tools can use this space to insert a hook, twisting the lock cylinder relative to the lock housing until it is locked, then insert a pry hook to lift each pin individually to a critical point for shearing and misalignment, achieving technical opening. This process typically takes ≤3 minutes and poses a serious security risk.

[0004] (2) Limitations of existing improvement schemes Despite various optimization attempts by the industry, fundamental flaws still exist.

[0005] For example, Chinese invention patent with authorization announcement number CN 112377002 B discloses a burglarproof mortise lock and its working method. It reduces the operating space by combining an irregular keyhole and a bird key. However, because it still retains the connected structure and the door pins in the toothed area do not form a separation zone, the dead zone height is still quite large. There is still space for tools to be inserted into the toothed keyhole for operation, which still poses a safety hazard.

[0006] For example, the Chinese utility model patent with authorization announcement number CN 213391599 U discloses a burglarproof mortise lock, which lowers the position of the lower pin to "below the first inner pin". Although the pin has the effect of protecting the other inner pins and preventing the tool from opening it by means of technology, and delaying the time when it is opened by means of technology, the pin is still in a suspended state in the keyhole of the toothed rib. The space left at the bottom of the pin is not completely eliminated. Tools can still be inserted and used to operate other pins, which also poses a security risk.

[0007] The above optimization solutions only delay the cracking time and cannot completely prevent the tool from being technically unlocked.

[0008] (3) Long-standing unresolved technological biases The lock industry is trapped in the misconception that "reinforcing ribs cannot be removed," directly leading to stagnation in anti-hacking capabilities. An expert once argued, "Reinforcing ribs are like the jawbone; without the jawbone, where would the teeth attach? Therefore, reinforcing ribs cannot be removed." In the past 20 years, no global lock patents (including CN 116905899 A, CN 221627928 U, CN 220415073 U, CN 308296578 S, etc.) have broken through the limitations of integrated structures, all assuming the existence of inherent operational space. This traps locks in a vicious cycle of "unpredictable vulnerability," where new locks are cracked immediately upon release, and new lock-picking tools follow suit instantly. Summary of the Invention

[0009] This utility model proposes a lock cylinder, key, and smart lock with a detachable toothed rib, aiming to completely eliminate the tool operation space of the toothed rib in the keyhole, completely solve the problem that pin tumbler locks are easily opened by technical means, and achieve true "anti-theft".

[0010] To solve the above problems, this utility model adopts the following technical solution: a lock cylinder with a detachable toothed rib, comprising a lock shell, a lock cylinder, and a key. The lock shell and lock cylinder are respectively provided with a plurality of pin holes, and pins are provided in the pin holes. The pin located at the front is the door pin. In the normal state where the key or tool is not inserted into the keyhole, the upper and lower door pins are at the critical surface that can be opened. When a lock-picking tool or an incompatible key is inserted, the interface between the upper and lower door pins is offset from the critical surface that can be opened, and instead, it is in a self-locking state. The lock cylinder is provided with a V-shaped keyhole, and the key includes toothed ribs and reinforcing ribs connected at the base and arranged on both sides. The toothed rib forms a break zone at the position of the frontmost door pin hole of the corresponding lock cylinder. The toothed height of this break zone is zero. The first and last toothed heights of the key toothed rib are also zero, forming a break structure. The door pins installed in the door pin holes include upper door pins and lower door pins; under normal conditions, the upper end of the lower door pin is located at the critical surface between the lock cylinder and the lock shell, and its lower end reaches the bottom surface of the broken tooth rib area, so that the lower door pin and the bottom surface of the keyhole form a zero-gap fit. The fit tolerance between the door pin hole and the door pin is smaller than the fit tolerance between the other pin holes and their corresponding pins. When the door pin is in a state of being held in place by torque, the pins in the other pin holes are in a loose state that is not held in place by torque. It is impossible to determine the critical point position of the pin held by the hook, so it is impossible to use the shearing misalignment of the critical point to achieve technical opening.

[0011] Preferably, the front end of the reinforcing rib extends beyond the front end of the toothed rib, forming a protective protrusion that extends beyond the tip of the toothed rib by 0.5mm to 2mm, in order to prevent injury from the sharp point.

[0012] Preferably, the radial single-sided gap between the door pin hole and the door pin is ≤0.01 mm, and the radial single-sided gap between the other pin holes and the corresponding pins is ≥0.03 mm.

[0013] Preferably, the included angle of the V-shaped keyhole is an acute angle, preferably 20°±2°.

[0014] Preferably, the lower front end of the toothed rib (3.12) is pointed, and the front end of the reinforcing rib (3.11) is blunt.

[0015] Another technical solution of this utility model is: a key for an anti-theft lock with a detachable toothed rib, used to open the aforementioned anti-theft lock cylinder, including a toothed rib and a reinforcing rib, the two being connected at their roots and arranged on both sides of the key body, the first and last toothed ribs of the toothed rib having a zero height, forming a detachable zone; the front end of the reinforcing rib extends beyond the front end of the toothed rib, forming a protective protrusion.

[0016] Preferably, the protective protrusion extends beyond the tip of the toothed rib by 1mm ± 0.2mm.

[0017] Another technical solution of this utility model is: a clover-shaped anti-theft lock with a detachable toothed rib, comprising a lock shell, a lock cylinder, and a key. The lock cylinder has a clover-shaped keyhole. The key includes a central toothed rib and two reinforcing ribs on both sides, which are connected at their bases. The first and last teeth of the central toothed rib have zero height, forming a detachable zone and thus a detachable structure. The front ends of the two reinforcing ribs extend beyond the front end of the central toothed rib, forming protective bosses. The length of the protective bosses extending beyond the tip of the central toothed rib is 1mm ± 0.2mm. The remaining structural features are the same as those described above.

[0018] Another technical solution of this utility model is: a clover-shaped anti-theft lock key with a detachable toothed rib, including a central toothed rib and two side reinforcing ribs, the three of which are connected at their roots. The first and last toothed ribs of the central toothed rib have a height of zero, forming a detachable zone, or a detachable structure. The front ends of the two side reinforcing ribs extend beyond the front end of the central toothed rib, forming protective protrusions.

[0019] Another technical solution of this utility model is: an intelligent door lock, comprising a main electronic lock body and the aforementioned anti-theft lock cylinder with a disconnectable toothed rib as an emergency backup mechanical lock cylinder.

[0020] Compared with the prior art, the present invention has the following significant advantages: (1) Completely eliminate tool operation space, from reducing space to zero space. Existing "anti-theft" grade lock cylinders (including Wangli's "Special Defense" series, Meike M5, etc.) still use a combined design of toothed ribs and reinforcing ribs. The toothed ribs only occupy about 1 / 3 of the key body height, while the remaining 2 / 3 of the reinforcing ribs form a natural "tool corridor" inside the keyhole. This utility model is the first to "sever" the toothed ribs at the corresponding positions of the door pins, directly reducing the height of the first and last toothed ribs to zero. This eliminates any protrusions between the bottom of the keyhole and the shear surface of the lock cylinder that could provide space for hooking or pick-hooking operations, reducing the tool operation space from "centimeter-level" to "millimeter-level" directly to zero, and lowering the probability of technical unlocking to 0.

[0021] (2) The combination of ultra-long gate pins and ultra-small tolerances realizes the instantaneous response of insertion and self-locking. Traditional door pins only serve to protect other pins behind them by blocking the way, and their tolerances are the same as ordinary pins. Tools can open them by segmenting and shifting them. This invention extends the length of the door pin to the bottom of the keyhole, and with ultra-small tolerances and gaps, as well as zero gaps at the bottom of the door pin, any tool of any thickness will push up the door pin, causing it to instantly cross the boundary and enter the lock shell pin hole, thus jamming the lock cylinder. In addition, because the tolerance of the door pin is smaller than that of the other pins, the slight misalignment caused by the hook is completely offset by the door pin, which is insufficient to create a perceptible "step" feel for subsequent pins, rendering traditional "feel" unlocking completely ineffective.

[0022] (3) Balancing ergonomics and safety Traditional keys often have blunt tips to maximize strength, which can easily cause injury due to accidental operation. This invention utilizes a 0.5–2 mm extension of the front end of a reinforcing rib to form a blunt protrusion, which preserves the overall strength of the key while preventing the tip from being exposed.

[0023] (4) Low compatibility and upgrade costs This invention does not add any electronic components and does not require redesigning the lock body; it can directly replace the existing mechanical lock cylinder or be used as an emergency mechanical module for smart door locks. The mold modification is minimal, and the mass production cost is low, far lower than the IC, display, and power modules required by existing electronic assisted control combination lock solutions.

[0024] (5) A leapfrog improvement in industry standards The current national standard for mechanical anti-theft locks (GA / T 73-2015) has a maximum protection level of "Super C" with a technical opening time of ≥10 min. This utility model, through its structural "zero space" design, makes the theoretical value of the technical opening time approach infinity. It is the first time in the industry to propose and verify the concept of "anti-theft level" mechanical security, and has strategic value in leading the upgrade of standards. Attached Figure Description

[0025] Figure 1 and Figure 2 This is a schematic diagram of the lock cylinder and key of the anti-theft lock in Example 1.

[0026] Figure 3 This is a schematic diagram of the V-shaped key structure in Examples 1 and 2.

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the lock cylinder of the anti-theft lock at the door pin tumbler in Example 1.

[0028] Figure 5 This is a schematic diagram of the clover-shaped anti-theft lock cylinder and its key in Example 3.

[0029] Figure 6 This is a schematic diagram of the structure of the clover-shaped anti-theft lock key in Examples 3 and 4.

[0030] In the diagram: 1—lock case, 2—lock cylinder, 3—key, 4—pin hole, 5—door pin hole, 6—V-shaped keyhole, 7—break-off zone, 8—door pin, 9—critical surface, 10—bottom surface of keyhole, 11—protective boss, 12—clover-shaped keyhole; 1.1—Mounting part, 1.2—Mounting hole, 1.3—Locking hole, 2.1—Front axle shoulder, 2.2—Rear axle shoulder, 2.3—Positioning piece; 3.1—Key body, 3.2—Key handle, 3.11—Reinforcing rib, 3.12—Flanged rib, 3.13—Central flanged rib; 8.1—Lower door pin, 8.2—Upper door pin, 8.3—Spring. Detailed Implementation

[0031] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0032] Example 1 like Figures 1 to 4 As shown, a lock cylinder of an anti-theft lock with a detachable toothed rib includes a lock shell 1, a lock cylinder 2, and a key 3. The lock shell 1 and the lock cylinder 2 are respectively provided with a plurality of pin holes 4. Pins are provided in the pin holes 4, and the pins located at the front are door pins 8. The lock cylinder 2 is provided with a V-shaped keyhole 6. The included angle of the V-shaped keyhole 6 is an acute angle, preferably 20°±2°. The key 3 includes toothed ribs 3.12 and reinforcing ribs 3.11 connected at the base and arranged on both sides. The toothed rib 3.12 forms a break zone 7 at the position of the frontmost door pin hole 5 of the corresponding lock cylinder. The toothed height of the break zone 7 is zero, that is, the first and last toothed heights of the toothed rib 3.12 are zero, forming a break structure. The door pins 8 installed in the door pin holes 5 include a lower door pin 8.1 and an upper door pin 8.2. In the normal state where no key or tool is inserted into the keyhole, the upper and lower door pins are at the openable critical surface 9. When a tool or an incompatible key is inserted, the interfaces of the upper and lower door pins shift away from the openable critical surface 9, resulting in a self-locking state. In the normal state, the upper end of the lower door pin 8.1 is located at the critical surface 9 between the lock cylinder 2 and the lock shell 1, and its lower end reaches the bottom of the broken area of ​​the toothed rib 3.12, creating a zero-gap fit between the lower door pin and the bottom surface 10 of the keyhole. By "breaking" the toothed rib at the corresponding position on the door pin, the height of the first / last toothed rib is directly reduced to zero, eliminating any protrusion between the bottom of the keyhole and the shear surface of the lock cylinder for hooking or prying operations. This reduces the tool operation space from "centimeter-level" to "millimeter-level" directly to zero, reducing the probability of technical unlocking to zero.

[0033] The fit tolerance between the door pin hole 5 and the door pin 8 is smaller than the fit tolerance between the other pin holes 4 and their corresponding pins. The radial single-sided clearance between the door pin hole 5 and the door pin 8 is ≤0.01 mm, while the radial single-sided clearance between the other pin holes and their corresponding pins is ≥0.03 mm. This results in the door pin 8 being held in a state of torque clamping, while the pins in the other pin holes 4 are all in a loose state without being clamped by torque. It is impossible to determine the critical point position of the pins held by the hook, and thus it is impossible to use the shearing misalignment of the critical point to achieve technical opening.

[0034] The front end of the reinforcing rib 3.11 extends beyond the front end of the toothed rib 3.12, forming a protective protrusion 11 that extends beyond the tip of the toothed rib by 0.5mm to 2mm. The lower part of the front end of the toothed rib 3.12 is pointed, while the front end of the reinforcing rib 3.11 is blunt to prevent injury from the sharp point.

[0035] Example 2 like Figure 3As shown, a key for an anti-theft lock with a detachable toothed rib is used to open the aforementioned anti-theft lock cylinder. It includes a toothed rib 3.12 and a reinforcing rib 3.11, which are connected at their roots and are located on both sides of the key body. The first and last toothed ribs of the toothed rib 3.12 have a zero toothed height, forming a detachable zone 7. That is, the first and last toothed ribs of the toothed rib 3.12 have a zero toothed height, forming a detachable structure. The front end of the reinforcing rib 3.11 extends beyond the front end of the toothed rib 3.12, forming a protective boss 11. The length of the protective boss 11 extending beyond the tip of the toothed rib is 1mm ± 0.2mm.

[0036] Example 3 like Figure 5 and Figure 6 As shown, a clover-shaped security lock with a detachable toothed rib includes a lock shell 1, a lock cylinder 2, and a key 3. The lock cylinder 2 has a clover-shaped keyhole 12. The key includes a central toothed rib 3.13 and two reinforcing ribs 3.11 on both sides, which are connected at their bases. The first and last teeth of the central toothed rib 3.13 have a zero height, forming a detachable zone 7, or a detachable structure. The front ends of the two reinforcing ribs 3.11 extend beyond the front end of the central toothed rib 3.13, forming protective bosses 11. The length of the protective bosses 11 extending beyond the tip of the central toothed rib 3.13 is 1 mm ± 0.2 mm. The remaining structural features are the same as in Embodiment 1.

[0037] Example 4 like Figure 6 As shown, a clover-shaped security lock key with a detachable toothed rib includes a central toothed rib 3.13 and two side reinforcing ribs 3.11, which are connected at their bases. The first and last teeth of the central toothed rib 3.13 have a zero height, forming a detachable zone 7, or a detachable structure. The front ends of the side reinforcing ribs 3.11 extend beyond the front end of the central toothed rib 3.13, forming protective bosses. The length of the protective bosses 11 extending beyond the tip of the central toothed rib 3.13 is 1mm ± 0.2mm.

[0038] Example 5 A smart door lock includes a main electronic lock body and the aforementioned anti-theft lock cylinder as an emergency backup mechanical lock cylinder.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A lock cylinder for an anti-theft lock with detachable toothed ribs, comprising a lock shell, a lock cylinder, and a key, wherein the lock cylinder has a V-shaped keyhole, and the key includes toothed ribs and reinforcing ribs connected at their bases and arranged on both sides, characterized in that: The toothed rib forms a break zone at the position of the frontmost door pin hole of the corresponding lock cylinder. The toothed height of this break zone is zero. The first and last toothed heights of the toothed rib are zero, forming a break structure. The door pins installed in the door pin holes include upper door pins and lower door pins; under normal conditions, the upper end of the lower door pin is located at the critical surface between the lock cylinder and the lock shell, and its lower end reaches the bottom surface of the broken tooth rib area, so that the lower door pin and the bottom surface of the keyhole form a zero-gap fit. The fit tolerance between the door pin hole and the door pin is smaller than the fit tolerance between the other pin holes and their corresponding pins. This means that when the door pin is in a state of being held in place by torque, the pins in the other pin holes are in a loose state without being held in place by torque. As a result, it is impossible to determine the critical point position of the pin held by the hook, and it is impossible to achieve technical opening.

2. The anti-theft lock cylinder according to claim 1, characterized in that: The front end of the reinforcing rib extends beyond the front end of the toothed rib, forming a protective protrusion that extends beyond the tip of the toothed rib to prevent injury from the sharp point.

3. The anti-theft lock cylinder according to claim 1, characterized in that: The radial single-sided gap between the door pin hole and the door pin is ≤0.01 mm, and the radial single-sided gap between the other pin holes and the corresponding pins is ≥0.03 mm.

4. The anti-theft lock cylinder according to claim 1, characterized in that: The included angle of the V-shaped keyhole is an acute angle, with an angle of 20°±2°.

5. The anti-theft lock cylinder according to claim 1, characterized in that: The lower part of the front end of the toothed rib is pointed, and the front end of the reinforcing rib is blunt.

6. A key for an anti-theft lock with a detachable toothed rib, used to open the lock cylinder of the anti-theft lock according to any one of claims 1-5, comprising a toothed rib and a reinforcing rib, the two being connected at their bases and positioned on both sides of the key body, characterized in that: The first and last teeth of the toothed rib have a height of zero, forming a break-off zone; the front end of the reinforcing rib extends beyond the front end of the toothed rib, forming a protective protrusion.

7. The anti-theft lock key according to claim 6, characterized in that: The protective protrusion extends 1mm ± 0.2mm beyond the tip of the toothed rib.

8. A smart door lock with a detachable locking cylinder, characterized in that: The lock cylinder comprising the main electrically controlled lock body and the anti-theft lock cylinder with the detachable toothed rib as described in any one of claims 1–5 serves as an emergency backup mechanical lock cylinder.

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