Prying-resistant mechanical door lock

Abstract

The utility model relates to the technical field of theft prevention, and discloses a prying-resistant mechanical door lock which comprises a lock cylinder, a shell and a lock shell located between the lock cylinder and the shell. The lock cylinder is provided with a lock tongue control assembly and at least one anti-prying linkage assembly. The anti-prying linkage assembly is in sliding connection with a tooth-shaped groove of the anti-prying sliding rod through a first anti-prying sliding block and drives an anti-prying limiting column to be clamped into a door frame lock hole, meanwhile, a second anti-prying sliding block is in linkage with a first sliding block of the spring bolt control assembly to compress a second spring, a spring bolt is forced to lock a door frame, and it is ensured that the spring bolt and the anti-prying limiting column are clamped into the door frame in the locking state; therefore, a double-rigidity locking state is formed, even if the lock cylinder is pried, the prying-resistant limiting column can still independently achieve the door locking function, and therefore the prying-resistant performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of anti-theft technology, specifically an anti-pry mechanical door lock. Background Technology

[0002] As a core component in the security field, the anti-pry performance of mechanical door locks has always been a key focus of industry research and development.

[0003] However, existing mechanical door locks still have significant shortcomings: First, the connection structure between the lock body and the door frame usually relies solely on the bolt being inserted into the door frame groove for fixation. When external force forcibly pries open the gap between the outer shell and the door frame, the lack of an effective rigid support structure makes it easy for the outer shell to detach from the door frame, thereby damaging the internal tumbler structure of the lock cylinder. Second, traditional bolt unlocking mechanisms are mostly driven by a single spring. When subjected to violent damage, the linkage stability between the sliding rod and the bolt is insufficient, posing a risk of unlocking failure or abnormal locking.

[0004] While some existing technologies conceal the toothed grooves by adding limiting blocks or decorative structures, they do not solve the problem of rigid fixation between the outer shell and the door frame. For example, in the prior art, utility model patent CN222633134U discloses a security door with anti-pry function, which improves the anti-pry capability to some extent by setting decorative blocks to conceal the toothed grooves on the outside of the door lock and using limiting blocks in the sliding groove to enhance the stability of the lock body. Although the above patent restricts the sliding of the lock body by limiting blocks, it does not set a linkage fixing rod structure between the outer shell and the door frame, and cannot resist the damage to the gap between them by continuous prying force. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an anti-pry mechanical door lock, which has the advantages of dynamic rigid fixation between the outer shell and the door frame and linkage stable control during the unlocking process. It solves the problems of traditional door locks where the outer shell detaches from the door frame, the unlocking fails, or the lock becomes abnormally locked under prying force.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A pry-resistant mechanical door lock includes a lock cylinder and a housing. A lock shell is disposed between the lock cylinder and the housing. The inner surface of the lock shell is slidably connected to the outer surface of the lock cylinder, and the outer surface of the lock shell is fixedly connected to the housing. The lock cylinder is provided with a vertically penetrating keyhole for inserting a key, a first guide wheel located on the side surface of the lock cylinder, and a plurality of first pin holes. The first guide wheel is fixedly connected to the side surface of the lock cylinder.

[0010] The lock cylinder is also provided with a lock tongue control component and at least one anti-pry component. The lock tongue control component is used to control the opening and closing of the door lock under the rotation of the first guide wheel. The lock tongue control component is fixedly connected to the anti-pry component. Its function is to trigger the door lock and the door frame to lock under abnormal external force. Through the cooperation of the toothed groove of the first anti-pry slider and the anti-pry slider rod, the lock tongue is forced to lock the door frame in the opposite direction.

[0011] Preferably, the anti-pry assembly includes a first anti-pry slider, an anti-pry limiting post, an anti-pry sliding rod, and a second anti-pry slider. The anti-pry sliding rod is fixedly connected to one end of the second anti-pry slider. The first anti-pry slider has a toothed groove on the side near the anti-pry sliding rod to allow the first anti-pry slider to slide. The end of the first anti-pry slider away from the lock cylinder is fixedly connected to the anti-pry limiting post. Its function is to form a double rigid locking state of the anti-pry limiting post and the lock tongue, preventing the door from being forcibly opened.

[0012] Preferably, the outer casing is provided with an anti-pry hole, an anti-pry rod groove, and an anti-pry sliding groove. The first anti-pry slider passes through the anti-pry hole, the anti-pry rod groove is slidably connected to the anti-pry rod, and the anti-pry sliding groove is slidably connected to the second anti-pry slider. The two ends of the anti-pry hole are provided with second fixing blocks that are fixedly connected to the outer casing, and the second fixing blocks are connected to the first anti-pry slider by a third spring.

[0013] Preferably, the latch control assembly includes a pressure rod, a slide rod, and a latch. The first guide wheel has a hole on the side away from the lock cylinder. A first spring is provided between one end of the pressure rod and the first guide wheel. Both the pressure rod and the first spring are located inside the hole of the first guide wheel. The outer surface of the pressure rod is slidably connected to the inner surface of the first guide wheel. A limit structure is provided at the end of the pressure rod away from the lock cylinder (2). The end face of the limit structure is provided with a pressure rod plane. One end of the slide rod is slidably connected to the pressure rod plane, and the other end is slidably connected to the latch. When the lock cylinder rotates, the pressure rod drives the slide rod to move. The slide rod is released from the constraint and rebounds under the action of the spring. A slide rod groove is provided on the inner surface of the outer shell. The slide rod groove is slidably connected to the slide rod. Its function is to drive the pressure rod to rotate synchronously when the lock cylinder is unlocked, so that the slide rod is released from the constraint of the pressure rod plane and slides away from the latch, thereby realizing the retraction of the latch.

[0014] Preferably, a fixing post is also fixedly provided on the outer shell, and a fixing hole is provided on the lock shell. The fixing hole is fitted onto the fixing post to fix the outer shell and the lock shell. Its function is to keep the outer shell and the lock shell relatively stationary, ensure the stability and integrity of the entire door lock structure, and prevent relative displacement or shaking between the outer shell and the lock shell. The fixing post also facilitates the installation and disassembly of the lock cylinder and the lock shell.

[0015] Preferably, the outer casing further comprises a latch shell, a slide rail, a second slider, and a first fixing block. The latch shell is located at one end of the anti-pry sliding groove. The latch shell has a sliding groove, and the sliding groove has a first slider. The first slider and the sliding groove are connected by a second spring. One end of the second anti-pry slider located on the anti-pry sliding groove is fixedly connected to the first slider. The slide rail is fixedly connected to the latch shell, and its end near the lock cylinder has a limiting post. The second slider slides along the slide rail, and the end of the second slider away from the lock cylinder is connected to the first fixing block by a spring. The first fixing block is fixed to the latch shell, and the latch is slidably connected to the first fixing block. The second slider has a hollow structure, and one end of the second slider is fixedly connected to the latch for retracting the latch under the action of the spring.

[0016] Preferably, the lock housing side surface is provided with a second guide wheel groove, a first guide wheel groove and a plurality of second pin holes, the first guide wheel slides along the first guide wheel groove, and the second pin holes have the same hole diameter and number as the first pin holes and are used to insert pin groups.

[0017] Preferably, the pin group includes a first pin located in a first pin hole and a second pin located in a second pin hole. The key is provided with a tooth groove corresponding to the first pin. The tooth groove pushes the first pin to align the pin group with the mating surfaces of the lock cylinder and the lock shell.

[0018] Preferably, the lock cylinder is further provided with a second guide wheel located below the first guide wheel. The second guide wheel is fixedly connected to the first guide wheel via a vertical rod. The second guide wheel slides on the groove of the second guide wheel. An arc-shaped limiting groove for sliding of the vertical rod is provided in the groove of the first guide wheel to limit the sliding position of the first guide wheel.

[0019] Preferably, the anti-pry limiting post has a tapered end away from the lock cylinder, and in normal conditions, part of it protrudes from the surface of the outer shell. When the lock cylinder is not unlocked and is subjected to abnormal external force, the first anti-pry slider remains in the pop-out state under the action of the third spring, so that the anti-pry limiting post is completely locked into the door frame lock hole, thereby achieving rigid locking between the door lock and the door frame.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, this utility model provides a pry-resistant mechanical door lock, which has the following advantages:

[0022] 1. This anti-pry mechanical door lock, by setting an anti-pry linkage component and a lock tongue control component, has one end of the second anti-pry slider located on the anti-pry sliding groove fixedly connected to the first slider in the lock tongue control component, realizing a double rigid locking structure of the anti-pry limiting post and the lock tongue. When the door lock is not unlocked, the anti-pry sliding rod pushes the first anti-pry slider to slide away from the lock cylinder, so that the anti-pry limiting post is completely locked into the door frame lock hole; at the same time, under the constraint of the pressure rod plane, the sliding rod drives the first slider to compress the second spring, forcing the lock tongue to lock the door frame, effectively preventing illegal intrusion.

[0023] 2. This anti-pry mechanical door lock, by setting a first guide wheel and a second guide wheel on the lock cylinder, allows the first guide wheel to drive the pressure rod to rotate synchronously after the lock cylinder is unlocked, causing the slide rod to disengage from the pressure rod plane and retract the lock tongue, thus achieving rapid unlocking.

[0024] 3. This anti-pry mechanical door lock features a lock shell outside the lock cylinder, with a first guide wheel groove and a second guide wheel groove on the lock shell. The second guide wheel is connected to the first guide wheel via a vertical rod and slides within the second guide wheel groove of the lock shell. The lock shell and the outer shell are fixed together by a fixing post, thus locking the lock shell and the outer shell together. This prevents the lock cylinder from rotating due to external prying, thereby avoiding separation of the outer shell from the door frame and improving the security performance of the door lock. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the anti-pry mechanical door lock of this utility model.

[0026] Figure 2 This is an exploded schematic diagram of the anti-pry mechanical door lock of this utility model.

[0027] Figure 3 This is a schematic diagram of the lock cylinder structure of the anti-pry mechanical door lock of this utility model.

[0028] Figure 4 This is a schematic diagram of the lock cylinder explosion of the anti-pry mechanical door lock of this utility model.

[0029] Figure 5 This utility model is a pry-resistant mechanical door lock. Figure 4 The enlarged diagram at 21 is shown in the image.

[0030] Figure 6 This utility model is a pry-resistant mechanical door lock. Figure 4 The enlarged diagram is shown in Figure 22.

[0031] Figure 7 This is a schematic diagram of the outer shell structure of the anti-pry mechanical door lock of this utility model.

[0032] Figure 8 This is a schematic diagram of the lock housing structure of the anti-pry mechanical door lock of this utility model.

[0033] Figure 9 This is a schematic diagram of the locked state of the anti-pry mechanical door lock of this utility model.

[0034] In the picture:

[0035] 1. Key; 11. Tooth groove; 2. Lock cylinder; 21. Latch control assembly; 211. Pressure rod; 2111. Pressure rod plane; 212. First spring; 213. Slide rod; 214. First slider; 215. Second spring; 216. Latch; 217. First fixing block; 218. Second slider; 219. Slide rail; 22. Anti-pry assembly; 221. Second fixing block; 222. Third spring; 223. First anti-pry slider; 224. Anti-pry limit post; 225. Anti-pry slide rod; 226. Second anti-pry slider; 23. Tumbler assembly; 231. First tumbler; 232. Second tumbler; 24. Keyhole; 25. First tumbler hole; 26. First guide wheel; 27. Second guide wheel;

[0036] 3. Outer shell; 31. Lock tongue shell; 32. Sliding groove; 33. Anti-pry hole; 34. Anti-pry slide bar groove; 35. Fixing post; 36. Anti-pry sliding groove; 37. Sliding bar groove; 4. Lock shell; 41. Second guide wheel groove; 42. First guide wheel groove; 43. Fixing hole; 44. Second pin hole. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] Example 1:

[0042] This embodiment provides a pry-resistant mechanical door lock with the following technical features.

[0043] Please see Figure 1-9 A pry-resistant mechanical door lock includes a lock cylinder 2 and a housing 3. A lock shell 4 is provided between the lock cylinder 2 and the housing 3. The inner surface of the lock shell 4 is slidably connected to the outer surface of the lock cylinder 2, and the outer surface of the lock shell 4 is welded to the housing 3. The lock cylinder 2 is provided with a vertically penetrating keyhole 24 into which a key 1 can be inserted, a first guide wheel 26 located on the side surface of the lock cylinder 2, and a plurality of first pin holes 25. The first guide wheel 26 is welded to the side surface of the lock cylinder 2.

[0044] The lock cylinder 2 is also provided with a bolt control component 21 and at least one anti-pry component 22. The bolt control component 21 is used to control the opening and closing of the door lock under the rotation of the first guide wheel 26. The bolt control component 21 is welded to the anti-pry component 22 and is used to trigger the door lock and the door frame to lock under abnormal external force.

[0045] In an optional embodiment, the anti-pry assembly 22 includes a first anti-pry slider 223, an anti-pry limiting post 224, an anti-pry sliding rod 225, and a second anti-pry slider 226. The anti-pry sliding rod 225 and one end of the second anti-pry slider 226 are welded together. The first anti-pry slider 223 is provided with a toothed groove on the side near the anti-pry sliding rod 225 to allow the first anti-pry slider 223 to slide. The end of the first anti-pry slider 223 away from the lock cylinder 2 is welded to the anti-pry limiting post 224.

[0046] It should be noted that when unlocking is required, the anti-pry bar 225 slides upward along the toothed groove.

[0047] In an optional embodiment, the outer casing 3 is provided with an anti-pry hole 33, an anti-pry slide bar groove 34, and an anti-pry slide groove 36. The first anti-pry slider 223 passes through the anti-pry hole 33, the anti-pry slide bar groove 34 is slidably connected to the anti-pry slide bar 225, and the anti-pry slide groove 36 is slidably connected to the second anti-pry slider 226. The two ends of the anti-pry hole 33 are provided with second fixing blocks 221 welded to the outer casing 3, and the second fixing blocks 221 are connected to the first anti-pry slider 223 by a third spring 222.

[0048] It should be noted that the third spring 222 provides elastic support for the first anti-pry slider 223. In the unlocked state, the anti-pry limit post 224 protrudes from the surface of the outer shell 3. When the door lock is pried, the anti-pry limit post 224 is inserted into the door frame tooth groove, realizing a double rigid support structure of the lock tongue 216 and the anti-pry limit post 224, preventing the outer shell 3 from easily detaching from the door frame and avoiding damage to the internal tumbler structure of the lock cylinder 2.

[0049] In an optional embodiment, the latch control assembly 21 includes a pressure rod 211, a slide rod 213, and a latch 216. The first guide wheel 26 has a hole on the side away from the lock cylinder 2. A first spring 212 is provided between one end of the pressure rod 211 and the first guide wheel 26. The pressure rod 211 and the first spring 212 are both located inside the hole of the first guide wheel 26. The outer surface of the pressure rod 211 is slidably connected to the inner surface of the first guide wheel 26. A limit structure is provided at the end of the pressure rod 211 away from the lock cylinder (2). The end face of the limit structure is provided with a pressure rod plane 2111. One end of the slide rod 213 is slidably connected to the pressure rod plane 2111, and the other end is slidably connected to the latch 216. When the lock cylinder 2 rotates, the pressure rod 211 drives the slide rod 213 to move. The slide rod 213 is released from the constraint and rebounds under the action of the spring. A slide rod groove 37 is provided on the inner surface of the outer shell 3. The slide rod groove 37 is slidably connected to the slide rod 213.

[0050] It should be noted that the contact surface between the slide bar 213 and the latch 216 is an inclined surface, and the inclined surface of the latch 216 is biased towards the upper part of the lock cylinder. When the lock is locked, it ensures that the pressure bar 211 always abuts against the upper end of the slide bar 213 through the pressure bar plane 2111, and the lower end of the slide bar 213 abuts against the latch 216, maintaining the latch 216 in the extended locked state. When the lock is unlocked, the lock cylinder 2 drives the first guide wheel 26 to rotate, and the pressure bar 211 rotates synchronously with the guide wheel. The change in the inclination angle of the pressure bar plane 2111 causes the slide bar 213 to lose its constraint. Under the action of the second spring 215, the slide bar 213 slides upward, and the latch 216 loses the constraint of the slide bar 213 and locks back under the action of the spring.

[0051] In an optional embodiment, a fixing post 35 is also fixedly provided on the outer shell 3, and a fixing hole 43 is provided on the lock shell 4. The fixing hole 43 is sleeved on the fixing post 35 to fix the outer shell 3 and the lock shell 4.

[0052] It should be noted that there is no relative rotation or displacement between the outer shell 3 and the lock shell 4, providing a stable support foundation for the sliding connection of the lock cylinder 2; at the same time, this structure supports quick assembly and disassembly. During installation, the lock shell 4 only needs to be aligned with the fixing post 35 and inserted. During maintenance, the outer shell and the lock shell can be directly separated, improving assembly efficiency and reducing maintenance costs.

[0053] In an optional embodiment, the outer casing 3 is further provided with a latch shell 31, a slide rail 219, a second slider 218, and a first fixing block 217. The latch shell 31 is located at one end of the anti-pry sliding groove 36. A sliding groove 32 is provided on the latch shell 31. A first slider 214 is provided on the sliding groove 32. The first slider 214 is connected to the sliding groove 32 by a second spring 215. One end of the second anti-pry slider 226 located on the anti-pry sliding groove 36 is welded to the first slider 214. The slide rail 219 is welded to the latch shell 31, and a limiting post is provided at its end near the lock cylinder 2. The second slider 218 slides along the slide rail 219. The end of the second slider 218 away from the lock cylinder 2 is connected to the first fixing block 217 by a spring. The first fixing block 217 is fixed on the latch shell 31. The latch 216 is slidably connected to the first fixing block 217. The second slider 218 has a hollow structure, and one end of the second slider 218 is fixedly connected to the latch 216.

[0054] It should be noted that the first fixing block 217 is provided with a slide rail for the sliding of the latch 216, and the second spring 215 provides a preload force for the latch control assembly 21, so that the first slider 214 is kept away from the sliding groove 32 under the action of the rebound force of the second spring 215 when it is in the unlocked state; when locked, the pressure rod 211 presses the slide rod 213, forcing the latch 216 to lock the door frame.

[0055] In an optional embodiment, the side surface of the lock case 4 is provided with a second guide wheel groove 41, a first guide wheel groove 42 and a plurality of second pin holes 44. The first guide wheel 26 slides along the first guide wheel groove 42, and the second pin holes 44 have the same hole diameter and number as the first pin holes 25 and are used to insert the pin group 23.

[0056] In an optional embodiment, the pin assembly 23 includes a first pin 231 located in the first pin hole 25 and a second pin 232 located in the second pin hole 44. The key 1 is provided with a tooth groove 11 corresponding to the first pin 231. The tooth groove 11 pushes the first pin 231 to align the pin assembly 23 with the mating surfaces of the lock cylinder 2 and the lock shell 4.

[0057] It should be noted that the alignment accuracy of the pin group 23 directly affects the rotational freedom of the lock cylinder 2. The depth of the groove 11 of the key 1 corresponds one-to-one with the length of the first pin 231. When the key is inserted, the groove 11 pushes the first pin 231 to move away from the lock cylinder 2, forming a continuous plane with the second pin 232, eliminating the jam between the lock cylinder 2 and the lock shell 4, and ensuring that only the matching key can trigger the unlocking.

[0058] In an optional embodiment, the lock cylinder 2 is further provided with a second guide wheel 27 located below the first guide wheel 26. The second guide wheel 27 is welded to the first guide wheel 26 via a vertical rod. The second guide wheel 27 slides on the second guide wheel groove 41. An arc-shaped limiting groove for sliding of the vertical rod is provided in the first guide wheel groove 42 to limit the sliding position of the first guide wheel 26.

[0059] It should be noted that the arc-shaped limiting groove restricts the sliding trajectory of the vertical rod within a preset angle range, preventing excessive rotation of the lock cylinder 2 from causing damage to the components and reducing wear between the guide wheel and the guide wheel groove; at the same time, this structure supports quick assembly and disassembly.

[0060] In an optional embodiment, the anti-pry limit post 224 has a tapered end away from the lock cylinder 2, and in normal condition, part of it protrudes from the surface of the outer shell 3; when the lock cylinder 2 is not unlocked and is subjected to abnormal external force, the first anti-pry slider 223 is kept in the pop-out state under the action of the third spring 222, so that the anti-pry limit post 224 is completely locked into the door frame lock hole, thereby achieving rigid locking between the door lock and the door frame.

[0061] It should be noted that the cone angle and the groove of the door frame lock hole cooperate to form a mechanical interlock after being locked in. Even if the lock cylinder 2 is forcibly damaged, the anti-pry limit post 224 can still lock the door frame independently and lock the door frame in conjunction with the lock tongue 216.

[0062] Working principle:

[0063] When locked, the pressure rod 211 keeps pressing the sliding rod 213 downwards, and the sliding rod 213 drives the first slider 214 to press the second spring 215. On one hand, the first slider 214 drives the second anti-pry slider 226, which is welded to it, to slide downwards simultaneously. The second anti-pry slider 226 slides, causing the anti-pry rod 225 to disengage from the toothed groove of the first anti-pry slider 223. Under the elastic tension of the third spring 222, the first anti-pry slider 223 pops out along the anti-pry hole 33 towards the door frame. The cone-shaped structure of the anti-pry limit post 224 forms a mechanical interlock with the door frame lock hole groove, so that even if the lock cylinder 2 is damaged, it can still lock the door frame independently. On the other hand, the sliding rod 213 slides down into the second slider 218, pushing the lock tongue 216, which is slidably connected to the sliding rod 213, to protrude into the outer shell. The lock tongue 216 is engaged in the groove of the outer door frame to realize the locking function.

[0064] When unlocking, key 1 is inserted, and its toothed groove 11 contacts the first pin 231, pushing the first pin 231 towards the second pin hole 44 until the dividing plane between the first pin 231 and the second pin 232 is flush with the contact surface of the lock cylinder 2 and the lock shell 4. After the pin group 23 is aligned, the jam between the lock cylinder 2 and the lock shell 4 is released, allowing the lock cylinder 2 to rotate. The first guide wheel 26 rotates synchronously with the lock cylinder 2, and the pressure rod 211 inside it retracts under the preload of the first spring 212, allowing the pressure rod 211 to slide along the inner surface of the outer shell 3. The slide bar 213 is released from the constraint of the pressure bar 211 and, under the elastic force of the second spring 215, pushes the first slider 214 to slide upward, while simultaneously causing the slide bar 213 to slide upward, thus relieving the pressure on the latch 216. Under the action of the spring rebound force between the first fixing block 217 and the second slider 218, the second slider 218 slides along the slide rail 219 toward the lock cylinder 2, and the latch 216 simultaneously retracts into the latch shell 31, thereby unlocking the device.

[0065] When the lock cylinder 2 is not unlocked, the anti-pry linkage component 22 operates independently of the lock cylinder. Even if the pin group 23 is damaged, the anti-pry limit post 224 can still be kept in the pop-out state by the elastic force of the third spring 222, ensuring the rigid connection between the door frame and the door lock and maximizing the time for forced entry.

[0066] In summary, this anti-pry mechanical door lock, by setting up an anti-pry component 22 and a latch control component 21, achieves a double rigid locking structure of anti-pry limiting post 224 and latch 216 by fixing one end of the second anti-pry slider 226 located on the anti-pry sliding groove 36 to the first slider 214 in the latch control component 21. When the door lock is not unlocked, the anti-pry sliding rod 225 pushes the first anti-pry slider 223 to slide away from the lock cylinder 2, so that the anti-pry limiting post 224 is completely locked into the door frame lock hole; at the same time, under the constraint of the pressure rod plane 2111, the sliding rod 213 drives the first slider 214 to compress the second spring 215, forcing the latch 216 to lock the door frame, effectively preventing illegal intrusion.

[0067] This anti-pry mechanical door lock, by setting a first guide wheel 26 and a second guide wheel 27 on the lock cylinder 2, allows the first guide wheel 26 to drive the pressure rod 211 to rotate synchronously after the lock cylinder 2 is unlocked, causing the slide rod 213 to disengage from the pressure rod plane 2111 and retract the lock tongue 216, thus achieving rapid unlocking.

[0068] This anti-pry mechanical door lock uses a lock shell 4 outside the lock cylinder 2. The lock shell 4 has a first guide wheel groove 42 and a second guide wheel groove 41. The second guide wheel 27 is connected to the first guide wheel 26 through a vertical rod and slides in the second guide wheel groove 41 of the lock shell 4. The lock shell 4 and the outer shell 3 are fixed by a fixing post 35, thereby locking the lock shell 4 and the outer shell 3. This prevents the lock cylinder 2 from rotating due to external prying, thus avoiding the outer shell 3 from separating from the door frame and improving the security performance of the door lock.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0070] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pry-resistant mechanical door lock, comprising a lock cylinder (2) and a housing (3), wherein a lock shell (4) is provided between the lock cylinder (2) and the housing (3), the inner surface of the lock shell (4) is slidably connected to the outer surface of the lock cylinder (2), and the outer surface of the lock shell (4) is fixedly connected to the housing (3); The lock cylinder (2) is provided with a vertically penetrating keyhole (24) into which a key (1) can be inserted, a first guide wheel (26) located on the side surface of the lock cylinder (2), and a plurality of first pin holes (25). The first guide wheel (26) is fixedly connected to the side surface of the lock cylinder (2). Its characteristic is that: The lock cylinder (2) is also provided with a lock tongue control component (21) and at least one anti-pry linkage component (22). The lock tongue control component (21) is used to control the opening and closing of the door lock under the rotation of the first guide wheel (26). The lock tongue control component (21) is fixedly connected to the anti-pry linkage component (22) and is used to trigger the door lock and the door frame to lock under abnormal external force.

2. The anti-pry mechanical door lock according to claim 1, characterized in that, The anti-pry linkage assembly (22) includes a first anti-pry slider (223), an anti-pry limiting post (224), an anti-pry sliding rod (225), and a second anti-pry slider (226). The anti-pry sliding rod (225) is fixedly connected to one end of the second anti-pry slider (226). The first anti-pry slider (223) has a toothed groove on the side near the anti-pry sliding rod (225) to allow the first anti-pry slider (223) to slide. The end of the first anti-pry slider (223) away from the lock cylinder (2) is fixedly connected to the anti-pry limiting post (224).

3. A pry-resistant mechanical door lock according to claim 2, characterized in that, The outer shell (3) is provided with an anti-pry hole (33), an anti-pry slide bar groove (34) and an anti-pry sliding groove (36). The first anti-pry slider (223) passes through the anti-pry hole (33), the anti-pry slide bar groove (34) is slidably connected to the anti-pry slide bar (225), and the anti-pry sliding groove (36) is slidably connected to the second anti-pry slider (226). The anti-pry hole (33) is provided with a second fixing block (221) at both ends, which is fixedly connected to the outer shell (3). The second fixing block (221) is connected to the first anti-pry slider (223) by a third spring (222).

4. A pry-resistant mechanical door lock according to claim 3, characterized in that, The latch control assembly (21) includes a pressure rod (211), a slide rod (213), and a latch (216). A hole is provided on the side of the first guide wheel (26) away from the lock cylinder (2). A first spring (212) is provided between one end of the pressure rod (211) and the first guide wheel (26). Both the pressure rod (211) and the first spring (212) are located inside the hole of the first guide wheel (26). The outer surface of the pressure rod (211) is slidably connected to the inner surface of the first guide wheel (26). The side of the pressure rod (211) away from the lock cylinder (2) has a hole. One end of the core (2) is provided with a limiting structure. The end face of the limiting structure is provided with a pressure rod plane (2111). One end of the slide rod (213) is slidably connected to the pressure rod plane (2111), and the other end is slidably connected to the lock tongue (216). When the lock core (2) rotates, the pressure rod (211) drives the slide rod (213) to move. The slide rod (213) is released from the constraint and rebounds under the action of the spring. The inner surface of the outer shell (3) is provided with a slide rod groove (37). The slide rod groove (37) is slidably connected to the slide rod (213).

5. A pry-resistant mechanical door lock according to claim 4, characterized in that, A fixing post (35) is also fixedly installed on the outer shell (3), and a fixing hole (43) is provided on the lock shell (4). The fixing hole (43) is sleeved on the fixing post (35) to fix the outer shell (3) and the lock shell (4).

6. A pry-resistant mechanical door lock according to claim 5, characterized in that, The outer casing (3) is also provided with a latch shell (31), a slide rail (219), a second slider (218) and a first fixing block (217). The latch shell (31) is located at one end of the anti-pry sliding groove (36). The latch shell (31) is provided with a sliding groove (32). The sliding groove (32) is provided with a first slider (214). The first slider (214) and the sliding groove (32) are connected by a second spring (215). One end of the second anti-pry slider (226) is fixedly connected to the first slider (214). The slide rail (219) is fixedly connected to the latch shell (31). The second slider (218) slides along the slide rail (219). The end of the second slider (218) away from the lock cylinder (2) is connected to the first fixing block (217) by a spring. The first fixing block (217) is fixed on the lock tongue shell (31). The lock tongue (216) is slidably connected to the first fixing block (217). The second slider (218) has a hollow structure. One end of the second slider (218) is fixedly connected to the lock tongue (216) and is used to drive the lock tongue (216) to retract under the action of the spring.

7. A pry-resistant mechanical door lock according to claim 6, characterized in that, The lock housing (4) has a second guide wheel groove (41), a first guide wheel groove (42) and several second pin holes (44) on its side surface. The first guide wheel (26) slides along the first guide wheel groove (42). The second pin holes (44) have the same hole diameter and number as the first pin holes (25) and are used to insert the pin group (23).

8. A pry-resistant mechanical door lock according to claim 7, characterized in that, The tumbler assembly (23) includes a first tumbler (231) located in the first tumbler hole (25) and a second tumbler (232) located in the second tumbler hole (44). The key (1) is provided with a tooth groove (11) corresponding to the first tumbler (231) for pushing the first tumbler (231) to align the tumbler assembly (23).

9. A pry-resistant mechanical door lock according to claim 8, characterized in that, The lock cylinder (2) is also provided with a second guide wheel (27) located below the first guide wheel (26). The second guide wheel (27) is fixedly connected to the first guide wheel (26) through a vertical rod. The second guide wheel (27) slides on the second guide wheel groove (41). An arc-shaped limiting groove for sliding of the vertical rod is provided in the first guide wheel groove (42) to limit the sliding position of the first guide wheel (26).

10. A pry-resistant mechanical door lock according to claim 2, characterized in that, The anti-pry limiting post (224) has a cone angle at the end away from the lock cylinder (2), and under normal conditions, part of it protrudes from the surface of the outer shell (3). When the lock cylinder (2) is not unlocked and is subjected to abnormal external force, the first anti-pry slider (223) causes the anti-pry limiting post (224) to be stuck in the door frame under the action of the third spring (222).

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