Tensile-resistant cross beam structure capable of internally lengthening lock cylinder and lock cylinder capable of being internally lengthened

Abstract

The tensile-resistant cross beam structure capable of internally lengthening the lock cylinder comprises a cross beam and lock shells detachably connected to the two sides of the cross beam, the cross beam is integrally formed and manufactured and comprises a middle column and connecting columns symmetrically arranged at the two ends of the middle column, each lock shell comprises a connecting part, and connecting holes allowing the connecting columns to penetrate in are formed in the connecting parts; symmetrical grooves are formed in the connecting columns at the two ends, connecting pieces used for being connected with the grooves in a clamped mode are installed on the lock shell, the connecting columns penetrate into the connecting holes and then are connected to the grooves in a clamped mode through the connecting pieces, and the middle column is fixedly connected with the connecting part through a fastening device. According to the scheme, by arranging the integrally-formed cross beam, the overall strength of connection between the cross beam and the lock shell and the tensile resistance of the cross beam are improved. The clamping fit of the groove and the connecting piece is combined with the fastening device to form double stable connection, so that the tensile resistance and the torsion resistance are ensured, and convenient disassembly and assembly are realized. The utility model further provides the lock cylinder capable of being lengthened internally, wherein the lock cylinder comprises the tensile-resistant cross beam structure of the lock cylinder capable of being lengthened internally.

Description

Technical Field

[0001] This utility model relates to the field of locks, specifically to a tensile-resistant beam structure and an extendable lock cylinder. Background Technology

[0002] Currently, when installing lock cylinders on doors, the varying thicknesses of doors often result in a mismatch between the lock cylinder's length and the door's thickness, preventing proper installation. To address this issue, extendable lock cylinders have emerged on the market. These extendable cylinders are categorized into internal and external extension cylinders. External extension cylinders are created by extending the original lock cylinder directly from both ends; while internal extension cylinders typically extend the cylinder between the latch and the original lock housing. In internal extension cylinders, the crossbeam plays a crucial role. It must ensure the overall stability of the extended lock cylinder structure, maintain sufficient tensile strength, facilitate easy disassembly and assembly during the extension process, and guarantee overall security after the lock cylinder is lengthened.

[0003] For example, patent application number 2021110026309, publication date 2021.11.23, entitled "An Extendable Lock Cylinder Structure," discloses an extendable lock cylinder. Specifically, it discloses an extendable lock cylinder structure including a beam assembly and a lock shell assembly disposed on the beam assembly. The beam assembly includes a middle beam, an outer beam detachably connected to one end of the middle beam, and an inner beam detachably connected to the other end of the middle beam. The lock shell assembly includes an outer lock shell disposed on the outer beam and a lock shell disposed on the other end of the middle beam. The crossbeam inner component has an inner lock shell, an outer lock shell with an outer lock cylinder inside, and an inner lock shell with an inner lock cylinder inside. The lower end of the crossbeam middle component has a lever that is linked to the outer lock cylinder and the inner lock cylinder. The crossbeam middle component and the crossbeam outer component and / or the crossbeam middle component and the crossbeam inner component are provided with a crossbeam extension component by means of a detachable connection. The lever and the outer lock shell and / or the lever and the inner lock shell are provided with an extension shell corresponding to the crossbeam extension component. The extension shell has a filler component inside. One end of the filler component is linked to the lever, and the other end is linked to the outer lock cylinder or the inner lock cylinder.

[0004] The beam assembly disclosed in the prior art is assembled from multiple parts, including a middle beam, an outer beam, an inner beam, and an extension beam. These parts are then connected by pins. The assembly and disassembly are relatively complicated, the connections between the parts are not tight enough, and the tensile strength is relatively low. The connections between the parts and the pins are easily broken, making it relatively easy for criminals to damage it with tools.

[0005] Therefore, overcoming the aforementioned shortcomings has become an important issue that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0006] This utility model overcomes the shortcomings of the above-mentioned technology and provides a tensile-resistant beam structure for an internally extendable lock cylinder and an internally extendable lock cylinder.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A tensile-resistant crossbeam structure with an internally extendable lock cylinder includes a crossbeam and a lock housing detachably connected to both sides of the crossbeam. The crossbeam is integrally formed and includes a central post and connecting posts symmetrically arranged at both ends of the central post. The lock housing includes a connecting part with connecting holes for the connecting posts to pass through. The connecting posts at both ends are provided with mutually symmetrical grooves. The lock housing is equipped with connectors for engaging with the grooves. After the connecting posts pass through the connecting holes, they are engaged with the grooves by the connectors. The central post is connected and fixed to the connecting part by a fastening device.

[0009] Furthermore, the connecting member is a retaining ring, the groove is a first annular groove circumferentially recessed on the connecting post, and the connecting part has a through hole for the retaining ring to pass through.

[0010] Furthermore, the connecting part is provided with a mounting hole that extends horizontally through the connecting part, the mounting hole communicates with the connecting hole, the connecting member is a pin installed in the mounting hole, the pin has a second annular groove recessed in the middle, and a hooking part is formed between the connecting post and the groove for engaging with the second annular groove.

[0011] Furthermore, the groove is a ram's horn-shaped groove, which includes a first rectangular groove in the middle and an arc-shaped groove communicating with the first rectangular groove. The arc-shaped groove extends upward along both sides of the first rectangular groove and is symmetrically arranged with the hook part as the center. The arc-shaped grooves on both sides extend upward along the first rectangular groove and bend outward along both sides of the hook part to form a ram's horn shape.

[0012] Furthermore, the end of the connecting post is provided with a notch. The notch extends upward along the end of the connecting post through the first rectangular groove and extends to the lower end of the arc groove on one side of the groove. The notch divides the arc groove on one side and the first rectangular groove into an arc groove and a second rectangular groove that are not interconnected. The second rectangular groove is connected to the arc groove on the other side. The cross-section of the second rectangular groove is smaller than the cross-section of the first rectangular groove.

[0013] Furthermore, the connecting part is provided with a horizontally penetrating mounting hole, which communicates with the connecting hole. The connecting member is a pin installed in the mounting hole. The groove is rectangular, and the pin is engaged in the groove. The end of the connecting post is provided with a notch, which extends upward along the end of the connecting post through the groove and to the groove wall at the upper end of the groove.

[0014] Furthermore, the fastening device includes a bolt, a first threaded hole on the central column, and a second threaded hole at the lower end of the connecting part corresponding to the position of the first threaded hole. The bolt passes through the first threaded hole and is threaded into the second threaded hole.

[0015] This case also provides an internally extendable lock cylinder, including the tensile-resistant crossbeam structure of the internally extendable lock cylinder mentioned above. The lock shell is equipped with a lock cylinder, and a pry bar is connected between the two sides of the lock cylinder. The central column is provided with a concave plane for avoiding the pry bar when it rotates.

[0016] Furthermore, at least one lock case extension is connected between the two lock cases. The upper end of the lock case extension has a concave arc surface. The upper end of the lock case extension abuts against the central post through the concave arc surface. One side of the lock case extension is fixed to the inner thread of the lock case by a screw, and the other side is connected to the lever sleeve.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This design solves the problems of weak connections, complex assembly and disassembly, low tensile strength, and susceptibility to damage caused by the splicing of multiple components in existing extended lock cylinder crossbeams by using a one-piece molded crossbeam. The one-piece molded crossbeam design improves the overall strength of the connection between the crossbeam and the lock housing. The groove and the snap-fit ​​fastening device, combined with the fastening mechanism, form a double stable connection, ensuring both the tensile and torsional resistance of the lock cylinder and enabling convenient assembly and disassembly to adapt to door thickness. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the overall structure disassembly of the third embodiment of the tensile-resistant beam structure with an internally extendable lock cylinder in this case.

[0020] Figure 2 This is a schematic diagram showing the overall structure disassembly of the first embodiment of the tensile-resistant beam structure with an internally extendable lock cylinder in this case.

[0021] Figure 3 This is a structural schematic diagram of the second embodiment of the crossbeam in this case.

[0022] Figure 4 This is a structural schematic diagram of the third embodiment of the beam in this case.

[0023] Figure 5 This is a structural schematic diagram of the fourth embodiment of the beam in this case.

[0024] Figure 6 This is a side view of the assembled structure of the lock cylinder that can be extended internally in this case.

[0025] Figure 7 yes Figure 6 A cross-sectional view along the AA direction.

[0026] Figure 8 This is a disassembly diagram of the lock cylinder in this case, which can be extended internally, without being extended.

[0027] Figure 9 This is a schematic diagram of the assembly state of the lock cylinder that can be extended internally in this case after the extended lock shell extension parts are connected to both sides of the shift sleeve. Detailed Implementation

[0028] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art:

[0029] First, it should be noted that the beam structure in this case is used for lock cylinders that can be extended internally. Therefore, because the lock cylinder needs to match the thickness of the door, it is often necessary to disassemble and reassemble the lock cylinder when an internal extension is required.

[0030] like Figures 1 to 7 As shown, this invention provides a tensile-resistant crossbeam structure with an internally extendable lock cylinder, including a crossbeam 1 and lock housings 2 detachably connected to both sides of the crossbeam 1. In practice, the crossbeam 1 is integrally molded and made of metal, preferably stainless steel. The beam 1 undergoes heat treatment followed by electroplating to further enhance its hardness and tensile strength. The integrally molded crossbeam 1 facilitates manufacturing, significantly reducing production costs and facilitating mass production. Furthermore, the integral design greatly reduces the number of parts, enhances the tensile strength of the crossbeam 1 and the lock cylinder as a whole, and makes assembly and disassembly more time- and labor-saving.

[0031] Furthermore, the crossbeam 1 includes a central column 11 and connecting columns 12 symmetrically arranged at both ends of the central column 11. The lock housing 2 includes a connecting portion 21, on which a connecting hole 211 is provided for the connecting column 12 to pass through. Grooves 121 are provided on both ends of the connecting column 12, and the grooves 121 are symmetrically arranged. A connector 3 is installed on the lock housing 2 for engaging with the grooves 121. After the connecting column 12 passes through the connecting hole 211, it is engaged with the groove 121 by the connector 3. The central column 11 is then connected and fixed to the connecting portion 21 by a fastening device.

[0032] As described above, the snap-fit ​​connection between the connector 3 and the groove 121, combined with the fastening device, ensures the stability of the connection between the beam 1 and the lock housing 2, further enhancing tensile strength and overall safety performance. Simultaneously, the snap-fit ​​connection between the connector 3 and the groove 121 facilitates quick assembly and disassembly between the beam 1 and the lock housing 2. In practice, users can simply replace the beam 1 of different lengths according to door thickness requirements, making the operation simpler and more convenient, suitable for users to perform themselves.

[0033] like Figure 2As shown, this is the first embodiment of the case. In this embodiment, the connector 3 is a retaining ring, the groove 121 is a first annular groove that is circumferentially recessed on the connecting post 12, and the connecting part 21 is provided with a through hole 211 for the retaining ring to pass through.

[0034] As described above, this embodiment utilizes a standardized and flexible design with a snap ring connection, enabling both quick assembly / disassembly and high-strength connection between the crossbeam 1 and the lock housing 2. The circumferential fit between the snap ring and the first annular groove significantly improves operational convenience while ensuring tensile strength, making it particularly suitable for scenarios requiring frequent adjustments to door thickness or maintenance. Through diverse snap ring types, groove structures, and material selections, this solution can flexibly adapt to different lock cylinder specifications and usage environments, providing an economical and reliable connection solution for internally extendable lock cylinders.

[0035] The reason for this is that directly connecting the two ends of the crossbeam 1 by drilling holes in the connecting posts 12 at both ends and then using pins or screws has certain drawbacks. First, it is inconvenient to disassemble and assemble. Second, because the lock cylinder is extended internally, its two sides are more exposed relative to the door panel. Criminals can easily damage the door panel slightly to see the pins or screws used to connect the crossbeam. At this point, criminals can easily use tools to remove the pins and screws, destructively disassembling the lock cylinder, separating the lock shell 2 from the crossbeam 1, damaging the inside of the lock cylinder, and illegally unlocking it. Because common pins are generally cylindrical with a uniform cross-section, they go straight in and out of the hole, making them easy to drive out with tools. In addition, the screw locking method has insufficient pulling force, making it easier for the crossbeam to be pulled out.

[0036] Therefore, this embodiment employs unconventional pins and unconventional grooves to solve the aforementioned technical problem. To address this technical problem, a second embodiment of this invention is shown below, with reference to... Figure 1 , Figure 3 , Figure 6 , Figure 7 As shown, in this embodiment, the connecting part 21 is provided with a mounting hole 212 that extends horizontally through the connecting part 21. The mounting hole 212 communicates with the connecting hole 211. The connecting member 3 is a pin installed in the mounting hole 212. A second annular groove 31 is provided inwardly in the middle of the pin. A hooking part 122 is formed between the connecting post 12 and the groove 121 for hooking with the second annular groove 31.

[0037] In practical implementation, the annular groove 121 and its two ends cooperate to form an I-shaped groove on the pin, facilitating engagement with the groove 121. The I-shaped groove engages with the wall of the groove 121, preventing the common problem of a pin being easily damaged when inserted and removed directly. This structure requires first removing the fastening device on the central column 11, then pulling the lock case 2 outwards to pull the second annular groove 31 of the pin out of the hook part 122 on the connecting column 12, before disassembling the pin. Because the fastening device is connected to the central column 11, which is generally installed in the center of the door panel and is more concealed, it usually requires significant damage to the door panel to be discovered, making illegal damage more difficult. However, when the user needs to extend the lock cylinder, it does not affect the user's ease of disassembly and assembly. This is because directly drilling holes in the connecting columns 12 at both ends of the crossbeam 1 and then connecting them with pins or screws has certain drawbacks. First, disassembly and assembly are inconvenient. Furthermore, because the lock cylinder is extended internally, its two sides are more exposed relative to the door panel. Criminals can easily damage the door panel slightly to expose the pins or screws connecting the crossbeam. At this point, they can easily use tools to remove the pins and screws, destructively disassembling the lock cylinder, separating the lock housing 2 from the crossbeam 1, damaging the internal structure of the lock cylinder, and illegally unlocking it. Since common pins are generally cylindrical with a uniform cross-section, they go straight in and out of the hole, making them easy to drive through with tools. Additionally, the screw locking method lacks sufficient pulling force, making it easier for the crossbeam to be pulled out.

[0038] Therefore, this embodiment employs unconventional pins and unconventional grooves to solve the aforementioned technical problem. To address this technical problem, a second embodiment of this invention is shown below, with reference to... Figure 1 , Figure 3 , Figure 6 , Figure 7 As shown, in this embodiment, the connecting part 21 is provided with a mounting hole 212 that extends horizontally through the connecting part 21. The mounting hole 212 communicates with the connecting hole 211. The connecting member 3 is a pin installed in the mounting hole 212. A second annular groove 31 is provided inwardly in the middle of the pin. A hooking part 122 is formed between the connecting post 12 and the groove 121 for hooking with the second annular groove 31.

[0039] In practical implementation, the annular groove 121 and its two ends cooperate to form an I-shaped groove on the pin, facilitating engagement with the groove 121. The I-shaped groove engages with the wall of the groove 121, preventing the common problem of a pin being easily damaged when inserted and removed directly. This structure requires first removing the fastening device on the central column 11, then pulling the lock case 2 outwards to pull the second annular groove 31 of the pin out of the hook part 122 on the connecting column 12, before disassembling the pin. Because the fastening device is connected to the central column 11, which is generally installed in the center of the door panel and is more concealed, it usually requires significant damage to the door panel to be discovered, making illegal damage more difficult. However, when the user needs to extend the lock cylinder, removing and reassembling it is much more convenient. This is because directly drilling holes in the connecting columns 12 at both ends of the crossbeam 1 and then connecting them with pins or screws has certain drawbacks. First, it is inconvenient to disassemble and assemble. Furthermore, because the lock cylinder is extended internally, its two sides are more exposed relative to the door panel. Criminals can easily damage the door panel slightly to expose the pins or screws connecting the crossbeam. At this point, they can easily use tools to remove the pins and screws, destructively disassembling the lock cylinder, separating the lock housing 2 from the crossbeam 1, damaging the internal structure of the lock cylinder, and illegally unlocking it. Since common pins are generally cylindrical with a uniform cross-section, they go straight in and out of the hole, making them easy to drive through with tools. Additionally, the screw locking method lacks sufficient pulling force, making it easier for the crossbeam to be pulled out.

[0040] Therefore, this embodiment employs unconventional pins and unconventional grooves to solve the aforementioned technical problem. To address this technical problem, a second embodiment of this invention is shown below, with reference to... Figure 1 , Figure 3 , Figure 6 , Figure 7 As shown, in this embodiment, the connecting part 21 is provided with a mounting hole 212 that extends horizontally through the connecting part 21. The mounting hole 212 communicates with the connecting hole 211. The connecting member 3 is a pin installed in the mounting hole 212. A second annular groove 31 is provided inwardly in the middle of the pin. A hooking part 122 is formed between the connecting post 12 and the groove 121 for hooking with the second annular groove 31.

[0041] In practical implementation, the annular groove 121 and its two ends cooperate to form an I-shaped groove on the pin. Through the contact transmission of force between the I-shaped groove and the hook part 122, the tensile strength between the crossbeam 1 and the lock shell 2 is effectively improved. At the same time, it facilitates the engagement with the groove 121. The I-shaped groove engages with the wall of the groove 121, preventing the conventional situation where the pin is easily damaged when it goes straight in and out. Our structure requires first removing the fastening device on the central column 11, then pulling the lock shell 2 outward to pull the second annular groove 31 of the pin out of the hook part 122 on the connecting column 12, and then disassembling the pin. Because the fastening device is connected to the central column 11, which is generally installed in the center of the door panel, it is more concealed and usually requires significant damage to the door panel to be discovered. Therefore, illegal damage is more troublesome. However, when the user needs to extend the lock cylinder, it is easier to remove and install it, forming a dual advantage of being difficult to damage from the outside and easy to disassemble and install from the inside.

[0042] Furthermore, based on the second embodiment described above, and continuing to refer to... Figure 1 , Figure 3 , Figure 6 , Figure 7 As shown, in this embodiment, the groove 121 is a ram's horn-shaped groove. The groove 121 includes a first rectangular groove 1211 disposed in the middle and an arc-shaped groove 1212 communicating with the first rectangular groove 1211. The arc-shaped groove 1212 extends upward along both sides of the first rectangular groove 1211 and is symmetrically arranged with the hook portion 122 as the center. The arc-shaped grooves 1212 on both sides extend upward along the first rectangular groove 1211 and bend outward along both sides of the hook portion 122 to form a ram's horn shape.

[0043] It should be noted that the directions and ram's horn shapes described in the text refer to the connecting post at the lower end of the diagram, and the direction indicated by the arrows. For ease of description and understanding, please refer to... Figure 3 As shown, in specific implementation, the first rectangular groove 1211 is used to provide a pin mounting position and allow the pin to move, facilitating the installation and removal of the pin. The arc-shaped grooves 1212 on both sides cooperate with the second annular groove 31 and the hook part 122 of the pin to avoid contact. Specifically, when the crossbeam 1 and the lock housing 2 are connected, the second annular groove 31 abuts against the hook part 122, while the pin parts at both ends of the second annular groove 31 move upward into the arc-shaped groove 1212 to avoid contact, thus completing the engagement between the crossbeam 1 and the lock housing 2.

[0044] As described above, this embodiment utilizes an innovative design with a ram's horn-shaped composite groove to construct a three-in-one connection structure that integrates positioning, guidance, and engagement, effectively solving the problems of easy damage and inconvenient disassembly / assembly associated with traditional pin connections. The cooperation between the ram's horn-shaped arc groove 1212 and the hook portion 122 enhances tensile strength and pry resistance while maintaining ease of disassembly / assembly for the user, making it particularly suitable for scenarios with high requirements for security and concealment.

[0045] The following is a third embodiment shown in this case, which is a further extension based on the second embodiment of this case, and is also the most preferred embodiment in this case. (Refer to...) Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, in this embodiment, a notch 123 is provided at the front end of the connecting post 12. The notch 123 extends upward along the lower end of the connecting post 12, passing through the first rectangular groove 1211 and extending to the lower end of the arc-shaped groove 1212 on one side of the groove 121. The notch 123 divides the arc-shaped groove 1212 on one side and the first rectangular groove 1211 into a second rectangular groove 1212 and a second rectangular groove 1213 that are not interconnected. The second rectangular groove 1213 is connected to the arc-shaped groove 1212 on the other side, and the cross-section of the second rectangular groove 1213 is smaller than the cross-section of the first rectangular groove 1211.

[0046] For ease of description and understanding, please refer to Figure 4 As shown, the structure formed by notch 123 actually involves a side cut where the connecting post 12 passes through the first rectangular groove 1211 from the end to the lower end of the arc-shaped groove 1212. Guided by the rotation of notch 123, disassembly and assembly can be completed without tools to remove the pin 3; simply loosen the fastening device, pull the lock housing 2 axially, and then rotate the crossbeam 1 in three steps. The unidirectional guidance of notch 123 prevents directional errors during installation, and when rotated into position, a clear locking feedback is generated due to the engagement of the hook part 122 and the pin 3, ensuring assembly accuracy. Notch 123 only provides a rotation path during disassembly; during normal use, the second annular groove 31 of the pin 3 remains tightly engaged with the hook part 122, maintaining the same tensile strength as the second embodiment. Safety performance is not reduced due to structural optimization, while the ease of disassembly and assembly is improved.

[0047] As described above, this structural design makes it easier to assemble and disassemble the crossbeam 1 when the user needs to lengthen the lock cylinder, building upon the previous embodiment. Specifically, after loosening the fastening device on the central column 11, the lock housing 2 is pulled outwards to pull the second annular groove 31 of the pin out of the hook portion 122 on the connecting column 12. Then, the crossbeam is rotated in the direction of the notch 123 to remove the crossbeam 1 from the lock housing 2. At this time, there is no need to disassemble the pin, as the pin remains installed on the lock housing 2. Conversely, when a crossbeam 1 of different lengths needs to be replaced after it has been disassembled, the crossbeam 1 is picked up and inserted into the connecting hole 211. The crossbeam 1 is then rotated in the direction of the notch 123 to pull the groove 121 into the installation position parallel to the pin. The lock housing 2 is then pushed inwards until the second annular groove 31 of the pin is pushed into the hook portion 122 on the connecting column 12, thus completing the engagement between the crossbeam 1 and the pin. Finally, the fastening device on the central column 11 is tightened. This connection structure in this embodiment greatly reduces the time and steps required for disassembly and assembly, and improves the efficiency of disassembly and assembly of the crossbeam.

[0048] The following describes the fourth embodiment of this case. In this embodiment, the connecting part 21 is provided with a mounting hole 212 that extends horizontally through the connecting part 21, and the mounting hole 212 communicates with the connecting hole 211. In this embodiment, the connecting member 3 is also a pin installed in the mounting hole 212. The groove 121 is rectangular, and the pin is engaged in the groove 121. A notch 123 is also provided at the front end of the connecting post 12, and the notch 123 extends upward through the groove 121 along the lower end of the connecting post 12 and extends to the groove wall 1214 at the upper end of the groove 121.

[0049] As mentioned above, refer to Figure 1 , Figure 5 , Figure 6 , Figure 7 As shown, in this embodiment, the descriptions of the same structure, function, effect, and working principle as in the previous three embodiments will not be repeated here; please refer to the corresponding descriptions in the previous three embodiments. It should be noted that the wall surface of the groove 121 is the wall surface forming the perimeter of the groove 121, and the groove wall surface 1214 at the upper end of the groove 121 is as follows... Figure 5The indicated position. In this embodiment, the pin directly engages with the groove 121, making installation and disassembly more convenient. After the user removes the fastening device on the central column 11, the crossbeam 1 can be disassembled by simply rotating it without pulling the lock case 2. In this embodiment, the pin can be a cylindrical pin with a consistent cross-section, which can directly enter and exit the groove 121, making it easier to disassemble and assemble the crossbeam 1. However, on the other hand, this structure in this embodiment has a higher security risk and is prone to the security problems mentioned in the second embodiment above. Through the minimalist design of the rectangular groove and the cylindrical pin, the ease of disassembly and assembly of the extendable lock cylinder is improved to a new level, which is suitable for civilian scenarios that are sensitive to cost and user experience. Although the security is reduced compared to the previous embodiments, users can find a balance between different security levels through structural optimization. Its core value lies in standardization, low cost, and user-friendly disassembly and assembly logic, providing a basic solution for the popularization of extendable lock cylinders, especially suitable for use as an entry-level product or accessory component.

[0050] like Figure 1 , Figure 6 , Figure 7 As shown, specifically, the fastening device includes a bolt 4, a first threaded hole 111 on the central column 11, and a second threaded hole 213 at the lower end of the connecting part 21 corresponding to the position of the first threaded hole 111. In specific implementation, the bolt 4 is inserted through the first threaded hole 111 and threaded into the second threaded hole 213, and after the connection is completed, the head of the bolt is completely recessed into the first threaded hole 111.

[0051] As described above, the common bolted connection method provides a reliable rigid fixation solution for the connection between the central column 11 and the lock housing 2, which can be internally extended. At the same time, this common structure and connection method facilitates user operation and component replacement. The concealed installation of the countersunk bolts balances convenience and safety, while the preload of the threaded connection, combined with the snap-fit ​​connection of the connector 3 and the groove 121, provides double protection, ensuring the stability of the connection between the beam 1 and the lock housing 2.

[0052] Reference Figure 1 , Figure 8 , Figure 9 As shown, this invention also provides an extendable lock cylinder, including a tensile-resistant beam structure for an extendable lock cylinder as described in any of the embodiments mentioned above. A lock cylinder 5 is installed inside the lock housing 2, and a lever 6 connects the two lock cylinders 5. A recessed plane 112 is provided on the central post 11 to allow the lever 6 to rotate smoothly, thereby eliminating interference between the lever 6 and the central post 11 during rotation and preventing the lever 6 from rotating unevenly or getting stuck.

[0053] As mentioned above, further, continue to refer to Figure 1 , Figure 8 , Figure 9 As shown, at least one lock case extension 7 is connected between the two lock cases 2. The upper end of the lock case extension 7 has a concave arc surface 71, and the upper end of the lock case extension 7 abuts against the central post 11 through the concave arc surface 71. The concave arc surface 71 facilitates the connection between the lock case extension 7 and the central post 11, so that the two fit completely; on the other hand, the concave arc surface 71 can evenly transmit the axial tensile force of the extension 7 to the circumference of the central post 11, avoiding deformation caused by single-point force and enhancing tensile strength. One side of the lock case extension 7 is fixed to the inner thread of the lock case 2 by a screw, and the other side is connected to the lever sleeve 6. In specific implementation, the connection between the lock case extension 7 and the lock case 2 is ensured by the screw and the threaded connection of the screw hole, and at the same time, the disassembly and assembly are simple and convenient. In practice, manufacturers can prepare crossbeams 1 of different lengths to be sold together with lock shell extension parts 7 of different sizes, allowing users to extend and install the lock cylinder themselves. When the lock cylinder needs to be extended, users only need to add lock shell extension parts 7 and choose to replace the crossbeam 1 with one of the appropriate length. The operation is simple and convenient and has a wide range of applications.

[0054] As stated above, this case protects a tensile-resistant beam structure with an internally extendable lock cylinder and an internally extendable lock cylinder. All technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A tensile-resistant beam structure with an internally extendable lock cylinder, characterized in that: The device includes a crossbeam (1) and a lock housing (2) detachably connected to both sides of the crossbeam (1). The crossbeam (1) is integrally formed. The crossbeam (1) includes a central column (11) and connecting columns (12) symmetrically arranged at both ends of the central column (11). The lock housing (2) includes a connecting part (21). The connecting part (21) has a connecting hole (211) for the connecting column (12) to pass through. The connecting columns (12) at both ends are provided with mutually symmetrical grooves (121). The lock housing (2) is equipped with a connector (3) for engaging with the groove (121). After the connecting column (12) passes through the connecting hole (211), it is engaged with the groove (121) by the connector (3). The central column (11) is connected and fixed to the connecting part (21) by a fastening device.

2. The tensile-resistant beam structure with an internally extendable lock cylinder according to claim 1, characterized in that: The connector (3) is a retaining ring, the groove (121) is a first annular groove that is circumferentially recessed on the connecting post (12), and the connecting part (21) has a through hole (214) for the retaining ring to pass through.

3. The tensile-resistant beam structure with an internally extendable lock cylinder according to claim 1, characterized in that: The connecting part (21) is provided with a mounting hole (212) that extends horizontally through the connecting part (21). The mounting hole (212) communicates with the connecting hole (211). The connecting member (3) is a pin installed in the mounting hole (212). The pin has a second annular groove (31) that is recessed inward in the middle. A hooking part (122) is formed between the connecting post (12) and the groove (121) for hooking with the second annular groove (31).

4. The tensile-resistant beam structure with an internally extendable lock cylinder according to claim 3, characterized in that: The groove (121) is a ram's horn-shaped groove. The groove (121) includes a first rectangular groove (1211) disposed in the middle and an arc-shaped groove (1212) communicating with the first rectangular groove (1211). The arc-shaped groove (1212) extends upward along both sides of the first rectangular groove (1211) and is symmetrically arranged with the hook part (122) as the center. The arc-shaped grooves (1212) on both sides extend upward along the first rectangular groove (1211) and bend outward along both sides of the hook part (122) to form a ram's horn shape.

5. The tensile-resistant beam structure with an internally extendable lock cylinder according to claim 3, characterized in that: The end of the connecting post (12) is provided with a notch (123). The notch (123) extends upward along the end of the connecting post (12) through the first rectangular groove (1211) and extends to the lower end of the arc groove (1212) on one side of the groove (121). The notch (123) divides the arc groove (1212) on one side and the first rectangular groove (1211) into an arc groove (1212) and a second rectangular groove (1213) that are not connected to each other. The second rectangular groove (1213) is connected to the arc groove (1212) on the other side. The cross-section of the second rectangular groove (1213) is smaller than the cross-section of the first rectangular groove (1211).

6. The tensile-resistant beam structure with an internally extendable lock cylinder according to claim 1, characterized in that: The connecting part (21) is provided with a mounting hole (212) that runs horizontally through the connecting part (21). The mounting hole (212) communicates with the connecting hole (211). The connecting member (3) is a pin installed in the mounting hole (212). The groove (121) is rectangular. The pin is engaged in the groove (121). The end of the connecting post (12) is provided with a notch (123). The notch (123) extends upward along the end of the connecting post (12) through the groove (121) and extends to the groove wall (1214) at the upper end of the groove (121).

7. A tensile-resistant beam structure with an internally extendable lock cylinder according to any one of claims 1-6, characterized in that: The fastening device includes a bolt (4), a first screw hole (111) on the central column (11), and a second screw hole (213) at the lower end of the connecting part (21) corresponding to the position of the first screw hole (111). The bolt (4) passes through the first screw hole (111) and is threaded into the second screw hole (213).

8. A lock cylinder that can be internally extended, comprising a tensile-resistant beam structure as described in claim 6, characterized in that: The lock shell (2) is equipped with a lock cylinder (5), and a lever sleeve (6) is connected between the two lock cylinders (5). The central column (11) is provided with a concave plane (112) for avoiding the lever sleeve (6) when it rotates.

9. A lock cylinder that can be internally extended according to claim 8, characterized in that: At least one lock case extension piece (7) is connected between the two lock cases (2). The upper end of the lock case extension piece (7) is provided with an inwardly concave arc surface (71). The upper end of the lock case extension piece (7) abuts against the central post (11) through the inwardly concave arc surface (71). One side of the lock case extension piece (7) is fixed to the inner side of the lock case (2) by screw thread connection, and the other side is connected to the lever sleeve (6).

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