A lock cylinder with adjustable length

Abstract

The lock core extension part also includes a boss limit connected to the lock shell part, the boss extends outward and is exposed in the lock shell part for the key to be inserted, and the two lock core extension parts can be connected end to end through the inner groove and the limit block.

Description

Technical Field

[0001] The present invention relates to the field of lock cores, and in particular to a lock core with adjustable length. Background Art

[0002] With evolving market demands and technological advancements, lock design is constantly innovating, particularly in the area of ​​adjustable length lock cylinders. Traditional lock cylinders are fixed in length, making them difficult to meet the needs of diverse applications. To address this issue, several adjustable length lock cylinder designs have emerged on the market.

[0003] Chinese utility model patent CN218668909U, published on March 21, 2023, discloses an adjustable-length lock cylinder. The cylinder comprises a front lock body, a rear lock body, a dial, and an extension assembly. The extension assembly includes several extension blades disposed between the front lock body and the dial and / or between the rear lock body and the dial. The extension blades are also mounted on a rotating shaft. The rotating shaft is formed by connecting a plurality of filler cores. The filler cores are disposed between the front lock core and the dial and / or between the rear lock core and the dial. The number of filler cores corresponds to the number of extension blades. Adjusting the length of the lock cylinder allows the cylinder to be adapted to different applications. The shaft, formed by connecting multiple filler cores, replaces the fixed length of the existing shaft. This allows for adaptability to different numbers of extension blades by providing a corresponding number of filler cores, facilitating adjustment of the lock cylinder length.

[0004] The lock core of the above-mentioned structure is divided into a front lock body and a rear lock body. The length of the lock core is adjusted by inserting an extension component between the front lock body and the rear lock body. This structure is complex and has high production costs. It is also inconvenient during installation or replacement, as the lock core needs to be disassembled and the extension component installed each time. Furthermore, the lock core is easily damaged during multiple replacements, which in turn reduces the life of the lock core. In addition, when adjusting the length, multiple extension components may be added, which not only affects the appearance but also the stability of the lock core. Therefore, the structure of the adjustable length lock core in the prior art needs to be further improved.

[0005] The Chinese utility model patent CN222207499U published on December 20, 2024 discloses a lock core with adjustable length, including a lock core body, the lock core body including a lock shell, a lock core and a lock core rotating shaft, the lock core has a keyhole for inserting a key, the lock core rotating shaft has a connecting mechanism for manual or electric unlocking, the lock core also includes a first lock shell extension and a lock core extension, the first lock shell extension and the lock core extension are detachably arranged on a side of the lock core body for inserting a key At one end, the lock shell is provided with a first fixing part for fixing the first lock shell extension part, the first fixing part includes a fixing groove and a fixing hole, the first lock shell extension part is provided with a plug-in unit matching with the fixing groove and a fixing column matching with the fixing hole; the lock core at the end of the lock core body for inserting the key is provided with a concave hole for fixing the lock core extension part, the lock core extension part is provided with a convex column matching with the concave hole, and the first lock shell extension part is provided with a mounting hole for placing the lock core extension part.

[0006] Although the above-mentioned prior art discloses that, compared to the prior art, an extension component is provided at one or both ends of the lock core body, and the length adjustment only requires the installation or replacement of a longer or shorter extension component without disassembling the lock core, which is more convenient than the technical solution disclosed in the first patent, its structure is fixed and the length adjustment is fixed, which cannot adapt to the needs of adjusting lock cores of different lengths. In addition, its lock core adjustment assembly has a simple structure. Specifically, the extension part of the lock shell is only limited by the plug-in and the fixing column with the fixing groove and the fixing hole respectively. This limited cooperation can easily cause the extension component to loosen or misalign during long-term use of the lock, making it impossible to unlock, posing a certain safety hazard.

[0007] Therefore, how to overcome the above-mentioned defects and provide a lock core with convenient adjustment of the lock core length and good structural stability has become an important issue that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0008] The present invention overcomes the deficiencies of the above-mentioned technology and provides a lock core with adjustable length.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A lock core with adjustable length comprises a main lock body, the main lock body comprises a lock core part and a lock head part, one end of the lock core part is provided with a keyhole for inserting a key, the end of the lock head part on the same side as the keyhole is provided with a sliding hole, the sliding hole is recessed downward from the top wall of the lock head part, an adjustable length lock shell extension part is slidably connected in the sliding hole, the lock shell extension part comprises a slide rail and a lock shell part, the slide rail is slidably connected in the sliding hole and is fixed by a locking device, at least one lock core extension part is connected between the lock shell part and the keyhole, The lock core extension part includes a through hole for the key to be removed and arranged along the front and back of the middle part of the lock core extension part. The lock core extension part also includes an inner groove opened on the right side thereof, and the inner groove wraps the end of the keyhole exposed from the lock core part and positions it. A limit block is provided in the inner groove, which is inserted into the upper end of the keyhole to limit the position. The lock core extension part also includes a boss connected to the lock shell part in a limiting manner. The boss extends outward and is exposed from the lock shell part for the key to be inserted. The two lock core extension parts can be connected end to end through the inner groove and the limit block.

[0011] Furthermore, the locking device includes a first screw hole opened at the right end of the sliding hole, a plurality of second screw holes opened on the sliding rail, and a bolt that passes through the second screw holes from top to bottom and enters the first screw hole for connection and fixation. After the bolt is completely inserted into the second screw hole and the first screw hole, its upper wall surface is lower than the second screw hole.

[0012] Furthermore, the distance between the axes of two adjacent second screw holes is 5-10 mm.

[0013] Furthermore, the slide rail includes a positioning block arranged at its left end, and a positioning groove for inserting the positioning block is recessed on the left side wall of the slide hole.

[0014] Furthermore, a length indicator mark is provided on the side wall of the slide rail.

[0015] Furthermore, the length of the extended portion of the lock core is 5mm-30mm.

[0016] Furthermore, a barrier sheet is provided at the bottom of the sliding hole for isolating the sliding hole from the internal structure of the main lock body.

[0017] Furthermore, a first anti-drill pin is symmetrically arranged on the front and rear side walls on the left side of the sliding hole, a second anti-drill pin is symmetrically arranged on the front and rear side walls on the right side of the sliding hole, and a third anti-drill pin is provided at the bottom of the lock head near the lock core part, and the third anti-drill pin is arranged close to the keyhole on the right side.

[0018] Furthermore, the other end of the main lock body laterally away from the keyhole is provided with a first connecting portion and a second connecting portion for manual or electric unlocking.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This design utilizes a sliding hole and rail, connecting them to a sliding connection, to achieve non-destructive length adjustment, eliminating the need to disassemble the entire lock cylinder. This design not only simplifies installation but also improves efficiency, making it particularly suitable for frequent adjustments or on-site installations. The rail can be fixed at any desired position, ensuring the adjusted lock cylinder length remains stable, avoiding the wear and instability associated with traditional methods due to frequent disassembly and assembly. The removable housing and cylinder extensions allow users to quickly replace extensions of varying lengths based on their needs. Multiple cylinder extensions can also be stacked end-to-end to adjust the cylinder length. This significantly enhances product usability and ease of maintenance, allowing the same lock cylinder to adapt to a variety of applications and reducing inventory management costs. The cylinder extension's end-to-end connection, through a through-hole and boss, ensures convenient key insertion even after adding the cylinder extension, ensuring smooth unlocking. The precise positioning of the inner groove and the stop block of the cylinder extension ensures that the cylinder extension can be accurately installed in the correct position and remains stable, reducing the risk of loosening during long-term use. This not only improves the security performance of the lock cylinder, but also extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall disassembly of the length-adjustable lock cylinder in this case.

[0022] Figure 2 This is a structural diagram of the lock core extension parts of two different sizes in this case.

[0023] Figure 3 It is a structural diagram of the main lock body in this case.

[0024] Figure 4 It is a side view of the assembled state of the adjustable length lock cylinder of this case.

[0025] Figure 5 This case Figure 4 Section view in the AA direction.

[0026] Figure 6 It is a three-dimensional diagram of the assembled state of the adjustable length lock cylinder of this case. DETAILED DESCRIPTION

[0027] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0028] like Figures 1 to 6As shown, the present invention provides a lock core with adjustable length, including a main lock body 1, which includes a lock core part 11 and a lock head part 12. In specific implementation, the main lock body is usually made of high-strength material to ensure its durability and safety. The lock core part 11 is the core part of the lock core, and contains a specific lock core and lock core structure inside, which realizes the unlocking operation by key or mechanical means. The lock head part 12 provides a connection point and a support structure, allowing the installation of additional length adjustment components and ensuring that these components can be firmly fixed on the main lock body. A keyhole 111 for inserting a key is provided at one end of the lock core part 11, so that the user can use the key to unlock. A sliding hole 121 is provided at one end of the lock head part 12 on the same side as the keyhole 111. The sliding hole 121 is recessed downward from the top wall of the lock head part 12, and an adjustable length lock shell extension part 3 is slidably connected in the sliding hole 121. The lock shell extension 3 includes a slide rail 31 and a lock shell portion 32. The slide rail 31 is slidably connected to the slide hole 121 and fixed by a locking device. The sliding cooperation between the slide hole 121 and the slide rail 31 facilitates the user to adjust the position of the lock shell extension 3 as needed, and then fixes it at the desired position through the locking device. While facilitating adjustment, the connection is more stable, which improves the stability and durability of the overall structure of the adjustable lock core of this case. This allows the overall length of the lock core to be flexibly adjusted according to the requirements of the installation environment and has a wide range of uses. The matching design of the slide hole 121 and the slide rail 31 allows the length of the lock core to be flexibly adjusted without disassembling the entire lock core, which simplifies the installation process and improves work efficiency. At least one lock core extension 4 is connected between the lock shell portion 32 and the keyhole 111. The lock shell portion 32 serves as an external protective layer and provides an installation platform for the lock core extension 4 and other internal components. During specific implementation, the user can adjust the length of the slide rail 31 in the slide hole 121 as needed to choose to increase or decrease the number of lock core extensions 4, thereby adjusting the overall length of the lock core of this case. The lock core extension 4 includes a through hole 41 that runs through the middle of the lock core extension 4 and is provided for the key to be inserted. The provision of the through hole 41 maintains the integrity of the key path inside the lock core and does not affect the normal key unlocking action. The lock core extension 4 also includes an inner groove 42 opened on its right side. The inner groove 42 wraps and positions the end of the keyhole 111 exposed from the lock core 11. A limit block 43 is provided in the inner groove 42 to engage the upper end of the keyhole 111 to limit the position. The lock core extension 4 also includes a boss 44 that is connected to the lock shell 32 in a limited manner. The boss 44 extends outward and is exposed from the lock shell 32 for key insertion. The two lock core extensions 4 can be connected end to end through the inner groove 42 and the limit block 43. The design of the inner groove 42 and the limit block 43 greatly improves the stability of the lock core extension part 4 after installation with the main lock body 1 and the lock shell part 32, and improves the stability of the lock core extension parts 4 after installation with each other, reducing the risk of loosening during long-term use.The setting of the boss 44 facilitates the better installation of the lock core extension 4 on the lock shell portion 32, and plays a limiting role, making the connection between the two more stable, while allowing the user to still insert the key conveniently without affecting the user experience. Secondly, the setting of the boss 44 facilitates the end-to-end matching of the two adjacent lock core extensions 4 with the inner groove 42 and the limit block 43, resulting in a precise connection and a more stable connection. The modular design of the lock core extension 4 in this case allows the lock core extension 4 of different lengths to be quickly replaced according to actual needs, thereby improving the applicability and maintenance convenience of the product. In specific implementation, the lock shell extension 3 and the lock core extension 4 are made of sturdy and durable materials, such as metal materials such as zinc alloy and copper, to enhance the strength and durability of the overall structure and effectively resist the influence of external shocks and environmental factors. In this case, in order to save costs while achieving a sturdy and durable effect, the lock shell extension 3 and the lock core extension 4 in this case are made of copper material.

[0029] It should be noted that the fixing groove and fixing hole of CN222207499U in the background technology are set on the side wall of the main lock body, while the sliding hole 121 of this case is formed by a recessed top of the lock head 12. This design is not easy to cause damage to the internal components of the lock core during the production process, leaving more space for other internal components (such as electronic components, mechanical transmission components), etc., which helps to optimize the internal structure layout and improve overall performance. At the same time, the design of the top sliding hole allows the user to adjust the length directly from the top without having to go around to the side or bottom, simplifying the installation and adjustment process. The top sliding hole 121 will not destroy the integrity and aesthetics of the side of the lock body, making the product look neater and more professional. The processing of the top sliding hole 121 is relatively simple, reducing the need for complex molds; at the same time, it is also easier to position and fix the slide rail 31 during assembly, reducing production difficulty and cost.

[0030] Specifically, if Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the locking device includes a first screw hole 122 provided at the right end of the slide hole 121, a plurality of second screw holes 311 provided on the slide rail 31, and a bolt 5 that passes from top to bottom through the second screw hole 311 and into the first screw hole 122 to connect and fix. The multiple second screw holes 311 provide flexible adjustment options, ensuring that the user can accurately set the lock core length according to actual needs. The close fit between the bolt 5, the first screw hole 122, and the second screw hole 311 ensures the stability of the connection between the slide rail 31 and the main lock body 1 after adjustment, preventing slippage and loosening. This bolt connection method has a simple structure, easy operation, and low cost. When the bolt 5 is fully inserted into the second screw hole 311 and the first screw hole 122, its upper wall surface is lower than the second screw hole 311, that is, the bolt 5 is completely sunk into the second screw hole 311, which not only improves the aesthetics but also enhances the safety and durability of the system.

[0031] Furthermore, the distance between the axes of two adjacent second screw holes 311 is 5-10 mm. This 5-10 mm spacing allows for more precise length adjustment, ensuring that the lock cylinder can precisely adapt to various installation dimensions. Preferably, in this case, considering cost and the user's desire for an increase in the overall length of the lock cylinder, the distance between the axes of two adjacent second screw holes 311 is 5 mm. It should be noted that the distance between the axes of two adjacent second screw holes 311 can also be 10 mm, for example.

[0032] Further, if Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the slide rail 31 includes a positioning block 312 disposed at its left end. A positioning slot 123 for the positioning block 312 to be inserted is recessed on the left side wall of the slide hole 121. In this embodiment, when the user does not need to add the lock core extension 4, the positioning block 312 is fully embedded in the positioning slot 123, ensuring the stability of the connection between the slide rail 31 and the main lock body 1. Moreover, from an external perspective, the two structures are connected as a whole, which is complete, stable, and more aesthetically pleasing. In this case, the lock core is not extended to meet the length requirements of a conventional lock core, but the thickness of the lock shell 32 needs to be set thinner to ensure a close fit with the main lock body 1 without affecting the length.

[0033] Further, if Figure 1 、 Figure 6 As shown, in order to facilitate the user to more intuitively and accurately adjust to the required length, a length indicator mark 313 is further provided on the side wall of the slide rail 31. In specific implementation, the length indicator mark is a scale that clearly marks different length positions.

[0034] Furthermore, the length of the lock core extension part 4 is 5mm-30mm. In this case, taking into account the cost and the user's demand for an increase in the overall length of the lock core, and at the same time, to facilitate the distance between the axes of the second screw holes 311, the length of the lock core extension part 4 is preferably set to 5mm. It should be noted that the length of the lock core extension part 4 can also be 10mm, 15mm, 20mm, etc. The different lengths of the lock core extension part 4 can meet the needs of a variety of installation environments and enhance the applicability of the product. Multiple lock core extension parts 4 can be further increased in length by connecting end to end, coordinating the sliding of the slide rail 31 relative to the slide hole 121, and coordinating the locking of the locking device to achieve adjustment of different length amplitudes.

[0035] like Figure 1 、 Figure 3 、 Figure 5 、 Figure 6As shown, a barrier sheet 6 is provided at the bottom of the sliding hole 121 to isolate the sliding hole 121 from the internal structure of the main lock body 1. The barrier sheet 6 prevents external dust, moisture, etc. from entering the interior of the main lock body 1, protecting the internal components from contamination, enhancing the sealing performance, and improving the waterproof and dustproof protection of the lock core.

[0036] like Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 As shown, a first anti-drill pin 7 is symmetrically positioned on the front and rear sidewalls to the left of the slide hole 121, and a second anti-drill pin 8 is symmetrically positioned on the front and rear sidewalls to the right of the slide hole 121. A third anti-drill pin 9 is positioned at the bottom of the lock head 12, near the lock core 11. The third anti-drill pin 9 is positioned near the right keyhole 111. The first, second, and third anti-drill pins 7, 8, and 9 each provide physical barriers from different angles, forming a multi-layered protection system that greatly increases the difficulty of unauthorized intrusion. The combined action of the first, second, and third anti-drill pins 7, 8, and 9 protects the most sensitive areas of the lock core, preventing the intrusion of tools such as drill bits, greatly improving the overall security of the lock core.

[0037] like Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the other end of the main lock body 1, laterally away from the keyhole 111, is provided with a first connecting portion 13 and a second connecting portion 14 for manual or electric unlocking. The design of the first connecting portion 13 and the second connecting portion 14 enables the lock cylinder in this embodiment to support both manual and electric unlocking, meeting the needs of different scenarios. This design provides a suitable solution for both traditional mechanical locks and modern smart locks, expanding the product's market reach.

[0038] As mentioned above, this case protects a lock core with adjustable length, and all technical solutions that are the same or similar to this case should be deemed to fall within the scope of protection of this case.

Claims

1. A lock core with adjustable length, comprising a main lock body (1), wherein the main lock body (1) comprises a lock core portion (11) and a lock portion (12), wherein one end of the lock core portion (11) is provided with a keyhole (111) for inserting a key, and wherein: A sliding hole (121) is provided at one end of the lock head (12) on the same side as the keyhole (111), and the sliding hole (121) is recessed downward from the top wall of the lock head (12). A lock shell extension part (3) with adjustable length is slidably connected in the sliding hole (121), and the lock shell extension part (3) includes a sliding rail (31) and a lock shell part (32). The sliding rail (31) is slidably connected in the sliding hole (121) and is fixed by a locking device. At least one lock core extension part (4) is connected between the lock shell part (32) and the keyhole (111), and the lock core extension part (4) includes a supply rail provided along the middle part of the lock core extension part (4). The through hole (41) for the key to be inserted, the lock core extension part (4) also includes an inner groove (42) opened on the right side thereof, the inner groove (42) wraps the end of the key hole (111) exposed from the lock core part (11) therein and positions it, and a limit block (43) is provided in the inner groove (42) for being inserted into the upper end of the key hole (111) to limit the position, the lock core extension part (4) also includes a boss (44) connected to the lock shell part (32) for limiting the position, the boss (44) extends outward and is exposed from the lock shell part (32) for the key to be inserted, and the two lock core extension parts (4) can be connected end to end through the inner groove (42) and the limit block (43).

2. The length-adjustable lock cylinder according to claim 1, characterized in that: The locking device comprises a first screw hole (122) opened at the right end of the slide hole (121), a plurality of second screw holes (311) opened on the slide rail (31), and a bolt (5) passing through the second screw hole (311) from top to bottom and penetrating into the first screw hole (122) for connection and fixing. After the bolt (5) is completely inserted into the second screw hole (311) and the first screw hole (122), its upper wall surface is lower than the second screw hole (311).

3. The length-adjustable lock cylinder according to claim 2, characterized in that: The distance between the axial centers of two adjacent second screw holes (311) is 5-10 mm.

4. The length-adjustable lock cylinder according to claim 1, characterized in that: The slide rail (31) includes a positioning block (312) arranged at its left end, and a positioning groove (123) for inserting the positioning block (312) is recessed on the left side wall of the slide hole (121).

5. The length-adjustable lock cylinder according to claim 1, characterized in that: A length indication mark (313) is also provided on the side wall of the slide rail (31).

6. The length-adjustable lock cylinder according to any one of claims 1 or 3, characterized in that: The length of the extended portion (4) of the locking core is 5mm-30mm.

7. The length-adjustable lock cylinder according to any one of claims 1 to 5, characterized in that: A barrier sheet (6) is provided at the bottom of the sliding hole (121) for isolating the sliding hole (121) from the internal structure of the main lock body (1).

8. The length-adjustable lock cylinder according to any one of claims 1 to 5, characterized in that: A first anti-drill pin (7) is symmetrically arranged on the front and rear side walls on the left side of the sliding hole (121), a second anti-drill pin (8) is symmetrically arranged on the front and rear side walls on the right side of the sliding hole (121), and a third anti-drill pin (9) is provided at the bottom of the lock head portion (12) close to the lock core portion (11), and the third anti-drill pin (9) is arranged close to the keyhole (111) on the right side.

9. The length-adjustable lock cylinder according to any one of claims 1 to 5, characterized in that: The other end of the main lock body (1) which is laterally away from the keyhole (111) is provided with a first connecting portion (13) and a second connecting portion (14) for manual or electric unlocking.

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