A lock cylinder structure

Abstract

The application relates to the field of locks, in particular to a lock cylinder structure which comprises a lock shell, an assembly hole is arranged in the lock shell, a lock cylinder is arranged in the assembly hole, the lock cylinder is provided with a key hole, the lock shell is provided with an upper ball hole, the lock cylinder is provided with a lower ball hole, the upper and lower balls are respectively arranged in the upper and lower ball holes, the lower end of the lower ball extends into the key hole, the lock cylinder is provided with an installation through groove which is communicated with the key hole, an assembly guide piece can be detachably replaced in the through groove, the guide piece is provided with a shaped part which extends into the key hole, the key hole and the shaped part constitute a composite key hole which can change the shape of the groove according to the replacement of the guide piece, the installation through groove is an arc-shaped through groove, the guide piece is provided with at least two groups of shaped parts which are different in profile shape, the outer surface of the guide piece is flush with the outer arc surface of the lock cylinder, an open groove is arranged in the middle of the lock shell and is used for assembling a pushing drag, the pushing drag is linked with the lock cylinder, one end of the lock cylinder is provided with a positioning groove, and the lock shell or the inner wall of the assembly hole is provided with a positioning protrusion for limiting the axial displacement of the lock cylinder. The application achieves the technical effects of changing the shape of the key hole groove and improving the safety and applicability of the lock cylinder structure.

Description

Technical Field

[0001] This application relates to the field of locks, and in particular to a lock cylinder structure. Background Technology

[0002] In the field of anti-theft lock cylinders, locks play a crucial role in protecting people's property and safety. With continuous social development, people's demand for security and theft prevention is increasing, and lock cylinder technology is also constantly advancing. From the initial simple mechanical lock cylinders to today's various complex anti-theft lock cylinders, their development history witnesses technological progress and people's growing emphasis on security. Advanced lock cylinder technology not only effectively prevents theft but also brings more convenience and peace of mind to people's lives and work, playing an indispensable role in various application scenarios such as homes and commercial spaces.

[0003] In the field of anti-theft lock cylinders, various technologies have traditionally been used to solve the problems of unlocking and locking. Among them, the pin tumbler lock cylinder is the most widely used. Its basic principle is that the different depths of the grooves on the key push the pins (divided into upper and lower pins) inside the lock cylinder to a specific height, aligning the dividing line (cutting line) between the upper and lower pins with the dividing line between the lock cylinder and the lock body, thus allowing the lock cylinder to rotate freely and complete the unlocking action. In addition, there are wafer lock cylinders, which unlock by pushing the wafer to a specific position after the key is inserted. Magnetic lock cylinders, on the other hand, use the magnetism of the key to control the magnetic elements inside the lock cylinder to achieve the purpose of unlocking. These traditional lock cylinder technologies have provided basic anti-theft protection for a long time.

[0004] However, existing traditional lock cylinders have many drawbacks. The key slot in a traditional lock cylinder is fixed; the shape of the key slot is predetermined at the factory and cannot be changed. This significantly reduces the difficulty of technically picking the lock. When the key is lost or copied, posing a security risk, users usually need to replace the entire lock cylinder, which is not only costly but also cumbersome. Furthermore, its security relies primarily on variations in the tumbler combination, offering relatively limited protection and failing to meet the high security requirements of modern society. Utility Model Content

[0005] The purpose of this application is to provide a lock cylinder structure.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: a lock cylinder structure, including a lock shell, an assembly hole provided in the lock shell, a lock cylinder that can rotate relative to the assembly hole is assembled in the assembly hole, and a keyhole for key insertion is provided in the lock cylinder; the lock shell is provided with an upper pin hole that extends through the assembly hole, and the lock cylinder is provided with a lower pin hole corresponding to the position of the upper pin hole, an upper pin is provided in the upper pin hole, a lower pin is provided in the lower pin hole, and the lower end of the lower pin extends into the keyhole; the lock cylinder is provided with an installation groove that communicates with the keyhole, and a guide plate is detachably and replaceably assembled in the installation groove, the guide plate is provided with a shaped part that extends into the keyhole, and the shaped part and the keyhole together constitute a composite keyhole whose groove shape can be changed as the guide plate is replaced.

[0007] By adopting the above technical solution, a detachable and replaceable guide plate is installed in the mounting groove on the lock cylinder that communicates with the keyhole. The guide plate, with its shaped part extending into the keyhole, together with the keyhole, forms a composite keyhole whose groove shape can be changed. This effectively solves the pain point of the fixed key groove of traditional lock cylinders. It not only greatly improves the lock cylinder's anti-technical opening capability, but also realizes the convenience of permission changes. When the key is lost or the usage permission needs to be adjusted, there is no need to replace the entire lock cylinder. Simply replacing the guide plate makes the old key ineffective due to the mismatch of the groove shape. The composite keyhole corresponding to the new guide plate is only compatible with the new key, which significantly reduces the cost of use and maintenance. At the same time, this structure retains the basic anti-theft logic of the pin engagement and adds a layer of protection by matching the key groove shape, forming a dual verification mechanism, which further improves the anti-theft security of the lock cylinder. Moreover, the overall structure is simple and does not add extra complexity to the lock cylinder assembly, thus balancing practicality and reliability.

[0008] Optionally, the mounting groove is an arc-shaped groove, and the curvature of the arc-shaped groove is adapted to the curvature of the outer arc surface of the lock cylinder.

[0009] By adopting the above technical solution, the installation groove is designed as an arc-shaped groove that matches the curvature of the outer arc surface of the lock cylinder. This allows for a tighter fit between the guide plate and the lock cylinder, effectively reducing gaps between the guide plate and the inner wall of the groove. This prevents the guide plate from shaking or shifting during use, improves the structural stability of the guide plate after assembly, and ensures that the groove shape of the composite keyhole remains accurate. At the same time, the compatibility of the arc-shaped structure with the outer arc surface of the lock cylinder makes full use of the outer circumferential space of the lock cylinder, preventing the groove structure from damaging the overall mechanical properties of the lock cylinder. It also allows the guide plate to form a natural transition with the outer surface of the lock cylinder after assembly, without adding extra radial dimensions to the lock cylinder. This ensures a proper fit between the lock cylinder and the lock body. Furthermore, the close-fitting arc shape reduces the probability of foreign objects entering the installation groove, lowers the risk of guide plate jamming, and extends the reliability of the lock cylinder.

[0010] Optionally, the guide pieces are configured as at least two groups, with different groups of guide pieces having different contour shapes, and the shape of the composite keyhole groove formed by the shape of each group of guide pieces cooperating with the keyhole is different from each other.

[0011] By adopting the above technical solution, the guide plates are set to at least two sets, and the outline of each set and the corresponding composite keyhole slot shape are different. This provides a rich selection space for the access control of the lock cylinder. Users can flexibly replace different sets of guide plates according to actual needs such as tenant changes, lost keys, and multi-user access distinctions, so as to realize multiple and diversified access changes without having to replace the lock cylinder body repeatedly. At the same time, the composite keyhole slots of different shapes further increase the difficulty of key duplication and technical opening, greatly improving the anti-theft security of the lock cylinder. Moreover, the same lock cylinder can be adapted to a variety of keys with different slot shapes, expanding the applicable scenarios of the lock cylinder, reducing the replacement cost under different usage needs, and taking into account both usage flexibility and anti-theft reliability.

[0012] Optionally, when the guide plate is assembled in the mounting slot, the outer surface of the guide plate is flush with the outer arc surface of the lock cylinder.

[0013] By adopting the above technical solution, the outer surface of the guide plate after assembly is flush with the outer arc surface of the lock cylinder. This prevents the guide plate from being bumped, worn, or pried by external forces due to protruding from the lock cylinder surface, thus improving the structural stability and resistance to damage after assembly. At the same time, the flush design eliminates the gap between the guide plate and the lock cylinder, reducing the probability of dust, impurities, and other foreign objects entering the installation slot, preventing the guide plate from getting stuck and affecting the normal use of the lock cylinder, and extending the service life of the lock cylinder. In addition, this design maintains the integrity and smoothness of the outer surface of the lock cylinder, does not increase the radial space occupied by the lock cylinder, ensures that the fitting installation of the lock cylinder and the lock body is not affected, and the installation position of the guide plate cannot be visually detected from the outside, reducing the risk of targeted cracking by criminals and further improving the anti-theft reliability of the lock cylinder.

[0014] Optionally, the lock housing has an opening groove in the middle, which is adjacent to the mounting hole. A lever is installed in the opening groove, and the lever is linked to the lock cylinder to transmit the rotational power of the lock cylinder to drive the lock body unlocking structure.

[0015] By adopting the above technical solution, the adjacent arrangement of the opening slot and the assembly hole in the middle of the lock case provides a precise and compact assembly space for the lever, ensuring a more direct and stable linkage between the lever and the lock cylinder, reducing losses and jamming during power transmission, and enabling the rotational power of the lock cylinder to be efficiently transmitted to the lock body's unlocking structure, ensuring smooth unlocking action. At the same time, the independent setting of the opening slot facilitates the separate assembly and maintenance of the lever, allowing for maintenance or replacement of the lever without disassembling the core components of the lock cylinder, improving the convenience of lock cylinder maintenance. Furthermore, this structural design makes full use of the internal space of the lock case without increasing the overall volume of the lock cylinder, ensuring that the fitting installation of the lock cylinder and the lock body is not affected, further enhancing the practicality and assembly rationality of the lock cylinder structure.

[0016] Optionally, a positioning groove is provided on one end face of the lock cylinder, and a positioning protrusion adapted to the positioning groove is provided on the inner wall of the lock shell or the assembly hole. The positioning protrusion is embedded in the positioning groove to limit the axial displacement of the lock cylinder in the assembly hole.

[0017] By adopting the above technical solution, the positioning groove on the end face of the lock cylinder and the positioning protrusion on the inner wall of the lock shell or mounting hole form a precise fit, which can effectively limit the axial displacement of the lock cylinder in the mounting hole, and prevent the lock cylinder from moving axially due to frequent unlocking and vibration during use. This ensures that the upper and lower pins are always precisely aligned, guaranteeing smooth and stable unlocking. At the same time, this positioning structure can reduce axial friction loss between the lock cylinder and the inner wall of the mounting hole, reduce the probability of component wear, extend the overall service life of the lock cylinder, and the fitting method of the positioning protrusion and positioning groove does not require additional fasteners. The structure is simple and compact, does not affect the assembly layout of other components inside the lock cylinder, and can also play a role in quick positioning during lock cylinder assembly, improving assembly efficiency, ensuring the consistency of the lock cylinder installation position, and further ensuring the reliability and stability of the lock cylinder.

[0018] In summary, this application has at least the following beneficial effect: 1. By utilizing a mounting groove on the lock cylinder that connects to the keyhole, a removable and replaceable guide plate is installed. The guide plate, with its shaped portion extending into the keyhole, together with the keyhole, forms a composite keyhole with an adjustable groove shape. This effectively solves the problem of fixed keyhole grooves in traditional lock cylinders. It not only significantly improves the lock cylinder's resistance to technical unlocking but also simplifies access control changes—when a key is lost or access control needs adjustment, there's no need to replace the entire lock cylinder; simply replacing the guide plate renders the old key ineffective due to the mismatched groove shape. The new guide plate's corresponding composite keyhole is only compatible with the new key, significantly reducing maintenance costs. Furthermore, this structure, while retaining the basic anti-theft logic of pin tumbler engagement, adds an extra layer of protection through keyhole shape matching, forming a dual verification mechanism that further enhances the lock cylinder's anti-theft security. The overall structure is simple, without adding extra complexity to the lock cylinder's assembly, balancing practicality and reliability.

[0019] 2. Designing the mounting groove as an arc-shaped groove that matches the curvature of the outer surface of the lock cylinder allows for a tighter fit between the guide plate and the lock cylinder, effectively reducing gaps between the guide plate and the inner wall of the groove. This prevents the guide plate from shaking or shifting during use, improves the structural stability of the assembled guide plate, and ensures that the groove shape of the composite keyhole remains accurate. Simultaneously, the compatibility of the arc-shaped structure with the outer surface of the lock cylinder fully utilizes the outer circumference of the lock cylinder, preventing the groove structure from damaging the overall mechanical properties of the lock cylinder. It also allows the guide plate to form a natural transition with the outer surface of the lock cylinder after assembly, without increasing the radial dimension of the lock cylinder, ensuring a proper fit between the lock cylinder and the lock body. Furthermore, the close-fitting arc shape reduces the probability of foreign objects entering the mounting groove, lowers the risk of guide plate jamming, and extends the reliability of the lock cylinder. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a lock cylinder structure; Figure 2 This is a schematic diagram of the guide plate structure; Figure 3 This is a schematic diagram of the keyhole structure without the guide plate installed; Figure 4 This is a schematic diagram of a keyhole structure equipped with a guide plate.

[0021] Figure Labels 1. Lock case; 2. Assembly hole; 3. Lock cylinder; 4. Keyhole; 5. Mounting through groove; 6. Guide plate; 7. Shaping part; 8. Opening groove; 9. Pulling drag; 10. Positioning groove. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of this utility model, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are also within the protection scope of this utility model.

[0023] This application mainly adopts a solution of replacing the guide plate 6 to change the shape of the composite keyhole 4, which achieves the effect of conveniently changing the key configuration and improving the security of the lock cylinder. The following is a further detailed description of this application.

[0024] Example 1 Reference Figures 1-4The lock cylinder structure provided in this application includes a lock shell 1, a lock cylinder 3, a lever 9, an upper pin, a lower pin, and a guide plate 6. The lock cylinder 3 is fitted into a mounting hole 2 within the lock shell 1 and is rotatable. The lever 9 is fitted into an opening groove 8 in the middle of the lock shell 1 and is linked to the lock cylinder 3. The upper pin is located in the upper pin hole of the lock shell 1, and the lower pin is located in the lower pin hole of the lock cylinder 3. The guide plate 6 is detachably and replaceably fitted into a mounting slot 5 of the lock cylinder 3. This combination achieves the beneficial effects of conveniently changing the key configuration and improving the security of the lock cylinder. This is because the replaceability of the guide plate 6 allows the shape of the composite keyhole 4 to be changed, increasing the difficulty of technically opening the lock. Furthermore, when it is necessary to change the key access, only the guide plate 6 needs to be replaced, without replacing the entire lock cylinder.

[0025] Specifically, the lock housing 1 is the external protective component of the lock cylinder structure. It can be made of metal, such as stainless steel or copper, to ensure sufficient strength and durability. The mounting hole 2 inside the lock housing 1 is used to install the lock cylinder 3. The inner wall of the mounting hole 2 should be smooth to reduce friction when the lock cylinder 3 rotates. The lock housing 1 has an upper pin tumbler hole that extends through the mounting hole 2. The function of the upper pin tumbler hole is to accommodate the upper pin. The upper pin is usually a metal sphere, its diameter of which matches the upper pin tumbler hole, allowing it to roll freely within the hole. The upper pin can be made of stainless steel or copper alloy to ensure its hardness and wear resistance.

[0026] The lock cylinder 3 is the core component of the lock cylinder structure, installed within the mounting hole 2 of the lock housing 1. The lock cylinder 3 has a keyhole 4 for key insertion, the shape and size of which should match the key. Corresponding to the upper pin tumbler hole, the lock cylinder 3 has a lower pin tumbler hole containing a lower pin, the lower end of which extends into the keyhole 4. The lower pin is also a metal sphere, its diameter matching the lower pin tumbler hole, allowing it to roll freely within the hole. When the lower pin is pushed to the appropriate height by the key, the boundary line between the upper and lower pins aligns with the boundary line between the lock cylinder 3 and the lock housing 1, allowing the lock cylinder 3 to rotate freely. The lock cylinder 3 has an installation groove 5 that communicates with the keyhole 4. The installation groove 5 is an arc-shaped groove, and its curvature matches the outer arc surface curvature of the lock cylinder 3, ensuring that the guide plate 6 can be tightly installed within the installation groove 5. The function of the installation groove 5 is to provide an installation position for the guide plate 6.

[0027] The guide plate 6 is a detachable and replaceable plate-like component. It can be configured as one or at least two sets, with different sets of guide plates 6 having different contour shapes for their shaped portions 7. Furthermore, the shape of the composite keyhole 4 groove formed by the shaped portion 7 of each set of guide plates 6 and the keyhole 4 is different for each set. The guide plate 6 can be made of materials such as plastic, metal, or ceramic, depending on the specific requirements. The shaped portion 7 of the guide plate 6 extends into the keyhole 4, forming a composite keyhole 4 whose groove shape can be changed as the guide plate 6 is replaced. When the guide plate 6 is installed in the mounting slot 5, its outer surface is flush with the outer arc surface of the lock cylinder 3, ensuring a smooth outer surface of the lock cylinder 3 and preventing interference with its rotation. The guide plate 6 can be replaced through a simple plug-and-play operation, which is convenient and quick.

[0028] The lever 9 is assembled in the opening groove 8 in the middle of the lock housing 1, and the opening groove 8 is adjacent to the mounting hole 2. The lever 9 is linked to the lock cylinder 3. When the lock cylinder 3 rotates, the lever 9 can transmit the rotational power of the lock cylinder 3 to drive the lock body unlocking mechanism. The lever 9 can be made of metal, such as steel or aluminum alloy, to ensure its strength and transmission efficiency. The linkage between the lever 9 and the lock cylinder 3 can be achieved through gears, chains, or direct mechanical connections.

[0029] A positioning groove 10 is formed on one end face of the lock cylinder 3. A positioning protrusion adapted to the positioning groove 10 is provided on the inner wall of the lock shell 1 or the mounting hole 2. The positioning protrusion is embedded in the positioning groove 10 to limit the axial displacement of the lock cylinder 3 within the mounting hole 2. The positioning groove 10 and the positioning protrusion can be rectangular, circular, or other geometric shapes, as long as they can achieve the functions of positioning and limiting displacement. The cooperation between the positioning groove 10 and the positioning protrusion ensures the stability of the lock cylinder 3 during rotation, preventing axial movement of the lock cylinder 3 and affecting the normal use of the lock cylinder.

[0030] The implementation principle of this embodiment is as follows: This lock cylinder structure, through the replacement guide plate 6 and the keyhole 4, forms a composite keyhole 4, greatly increasing the security of the lock. When unlocking, the key must first perfectly match the composite key slot in terms of its outline to be successfully inserted into the lock cylinder; this is the first physical shape verification. After the key is fully inserted, the toothed grooves on the key body push the pins to the correct height, completing the second password verification, at which point the lock cylinder can rotate. When it is necessary to change the key's access rights, the user only needs to remove the current guide plate 6 and replace it with a new guide plate 6 of a different shape from another set. After replacement, the shape of the composite key slot changes accordingly, causing the old key to become incompatible and unable to be inserted, thus immediately becoming invalid. Only the new key that matches the new guide plate 6 can be used, achieving a fast and low-cost "lock replacement" effect. Compared with traditional lock cylinders, this lock cylinder structure solves the problems of fixed key slots, difficulty in security upgrades, and single protection dimensions, improving the lock's resistance to technical opening, reducing the cost and operational difficulty of changing key access rights, and possessing higher practicality and security.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lock cylinder structure, characterized in that, The lock includes a lock shell (1), which has an assembly hole (2) and a lock cylinder (3) that can rotate relative to it. The lock cylinder (3) has a keyhole (4) for inserting a key. The lock shell (1) has an upper pin hole that extends through the assembly hole (2). The lock cylinder (3) has a lower pin hole corresponding to the upper pin hole. The upper pin hole contains an upper pin, and the lower pin hole contains a lower pin. The lower end of the lower pin extends into the keyhole (4). The lock cylinder (3) has an installation groove (5) that communicates with the keyhole (4). The installation groove (5) has a detachable and replaceable guide plate (6). The guide plate (6) has a shaped part (7) that extends into the keyhole (4). The shaped part (7) and the keyhole (4) together form a composite keyhole (4) whose groove shape can be changed as the guide plate (6) is replaced.

2. The lock cylinder structure according to claim 1, characterized in that, The mounting groove (5) is an arc-shaped groove, and the curvature of the arc-shaped groove is adapted to the curvature of the outer arc surface of the lock cylinder (3).

3. The lock cylinder structure according to claim 1, characterized in that, The guide piece (6) is configured as at least two groups, and the shaping part (7) of different groups of guide pieces (6) has different contour shapes, and the shape of the composite keyhole (4) groove formed by the shaping part (7) of each group of guide pieces (6) and the keyhole (4) is different from each other.

4. The lock cylinder structure according to claim 1, characterized in that, When the guide plate (6) is assembled in the mounting slot (5), the outer surface of the guide plate (6) is flush with the outer arc surface of the lock cylinder (3).

5. The lock cylinder structure according to claim 1, characterized in that, The lock housing (1) has an opening groove (8) in the middle, which is adjacent to the assembly hole (2). A lever (9) is installed in the opening groove (8), which is linked to the lock cylinder (3) to transmit the rotational power of the lock cylinder (3) to drive the lock body unlocking structure.

6. The lock cylinder structure according to claim 1, characterized in that, A positioning groove (10) is provided on one end face of the lock cylinder (3), and a positioning protrusion adapted to the positioning groove (10) is provided on the inner wall of the lock shell (1) or the assembly hole (2). The positioning protrusion is embedded in the positioning groove (10) to limit the axial displacement of the lock cylinder (3) in the assembly hole (2).

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