A variable-diameter double-locking rotary fixer for an office chair gas rod

Abstract

The utility model discloses a variable diameter type double locking rotary fixer for office chair gas rod belongs to furniture machinery accessories technical field. The fixer includes fixer main part, variable diameter ring and locking assembly, and fixer main part is the double -deck structure of openable, and through the hinging structure connection forms the accommodating cavity to wrap office chair lift gas pressure rod, and variable diameter ring is located in the accommodating cavity, can be adapted to the gas rod of different diameter, and locking assembly contains lower locking part and upper locking part. The utility model does not need to dismantle office chair original component and can be installed without damage, and through variable diameter ring adaptation different specification gas rod, with the help quick -release wrench linkage screw knob, the double locking mode of upper fixed screw, flexible control seat rotation and lifting function, solved the single specification of existing scheme, the problem of complicated installation, function can not switch, is applicable to the scene of having specific demand to seat stability such as student study chair, lumbar / spinal disease patient chair.

Description

Technical Field

[0001] This utility model belongs to the technical field of furniture machinery parts, specifically relating to a variable diameter double-locking rotary fixator for gas springs of office chairs. Background Technology

[0002] In the field of office chairs, student study chairs, and other seating systems that utilize height-adjustable gas springs, the gas spring serves as a core functional component, responsible for adjusting the seat height and enabling seat rotation. In practical use, certain scenarios have specific requirements for seat stability. For example, when students are studying, seat rotation can easily distract them, necessitating restrictions on the rotation function to maintain good posture. Similarly, for individuals with lumbar or spinal disorders using office chairs, unrestricted seat rotation may increase spinal strain and exacerbate pain, requiring controllable locking of the rotation and height adjustment functions.

[0003] Currently, the mainstream solution in the industry for addressing the aforementioned seat function locking requirements is to replace the original height-adjusting gas spring of the office chair. This involves using a dedicated height-adjusting gas spring with a locking function to replace the original ordinary gas spring. The dedicated gas spring's structural design secures the seat's rotation or height adjustment function. However, this existing locking solution based on "replacing the gas spring" has several insurmountable drawbacks, specifically in the following aspects:

[0004] Firstly, the compatibility with specifications is extremely poor. Currently, only 50mm diameter gas springs on the market have a locking function, while 38mm and 40mm diameter gas springs are more widely used in the office chair industry. There is a lack of products with locking functions for these two diameter gas springs, resulting in most office chairs using 38mm and 40mm diameter gas springs being unable to meet the locking function requirement due to specification mismatch.

[0005] Secondly, the installation process is cumbersome and potentially destructive. Replacing the gas spring with a locking function requires completely disassembling the office chair's seat cushion, chassis, and other components before the original gas spring can be removed and the new locking gas spring installed. This process is complex and difficult for ordinary users to complete independently. Furthermore, the disassembly and reassembly process can easily cause wear or damage to the chair components, affecting the overall lifespan of the chair.

[0006] Third, the lack of functional flexibility. Gas springs with locking functions can only achieve a single function state, that is, either in the "locked state" (cannot rotate / lift) or in the "unlocked state" (can rotate / lift). If the user needs to restore the seat's rotation or lifting function later, the seat must be disassembled again and replaced with the original ordinary gas spring, which is costly and inefficient, and cannot meet the need for flexible function switching.

[0007] Fourth, it adds an extra operational barrier for users. Before purchasing a locking gas spring, users need to confirm the length and specifications of their existing gas spring to avoid the new gas spring being incompatible with the seat size, which would prevent installation. This "size verification" step further increases the complexity of the user's operation and reduces the practicality of the solution.

[0008] In summary, existing gas spring-based office chair function locking solutions suffer from limitations such as limited specifications, cumbersome installation, inflexible functions, and high operational barriers, making it difficult to meet diverse market demands. In particular, they are unsuitable for scenarios with urgent needs for seat stability and diverse gas spring specifications, such as student chairs and chairs for patients with lumbar / spinal diseases. Therefore, there is an urgent need for an office chair gas spring function locking technology solution that can overcome the above-mentioned shortcomings. Utility Model Content

[0009] In view of this, the purpose of this utility model is to overcome the shortcomings of existing related technologies and provide a variable diameter double-locking rotating retainer for office chair gas springs. This retainer is specifically designed for the rotation and lifting function control of office chair height-adjusting gas springs. Through its internally integrated variable diameter ring structure, it aims to be compatible with commonly used 38mm, 40mm, and 50mm diameter office chair height-adjusting gas springs on the market, solving the problem of the single specification limitation of existing technologies that can only adapt to 50mm diameter gas springs with locking functions. Furthermore, it allows for non-destructive installation by directly mounting it onto the existing gas spring of the office chair without disassembling the original components such as the office chair seat cushion and chassis, or replacing the gas spring. This avoids the cumbersome operation and wear and tear on seat components caused by replacing the gas spring in existing solutions. This solution addresses the issue of damage; it aims to achieve selective locking and unlocking of the rotation and height functions of office chairs through a dual locking method using both quick-release wrench locking and screw fixing, overcoming the shortcomings of existing gas springs that can only achieve a single function and cannot be flexibly switched; it aims to reduce the operational threshold and improve the practicality of the solution by eliminating the need for users to verify the length specifications of the office chair gas spring in advance; it also aims to meet the functional control needs of scenarios with specific requirements for seat stability, such as student study chairs (avoiding the distraction of rotation) and office chairs used by patients with lumbar or spinal diseases (reducing the burden on the spine), filling the gap in the adaptation of existing technologies to such scenarios, and comprehensively solving the problems of single specifications, cumbersome installation, and inability to switch functions in existing office chair gas spring locking solutions.

[0010] To achieve the above objectives, this utility model provides a variable diameter double-locking rotary fixer for gas springs of office chairs, including a fixer body, a variable diameter ring, and a locking assembly;

[0011] The main body of the fixation device is an openable double-layer structure, including a lower layer structure and an upper layer structure. The lower layer structure and the upper layer structure are connected by a hinge structure to form a receiving cavity for enclosing the gas spring of the office chair.

[0012] The variable diameter ring is located in the receiving cavity of the main body of the fixation device, and is used to adapt to the gas spring of office chair with different diameters.

[0013] The locking assembly includes a lower locking member located at the lower part of the fixture body and an upper locking member located at the upper part of the fixture body. The lower locking member is used to initially fix the fixture body to the office chair lifting gas spring, and the upper locking member is used to realize the opening and closing locking of the fixture body to control the rotation and lifting functions of the office chair lifting gas spring.

[0014] Furthermore, the hinge structure is a four-ring interlocking hinge structure, which is located at the non-opening end of the lower structure and the upper structure. The lower structure and the upper structure are rotatably connected through the four-ring interlocking hinge structure, so that they can rotate around the four-ring interlocking hinge structure to achieve opening and closing.

[0015] Furthermore, the lower structure has a diameter of 50 mm, and the upper structure has a diameter of 28 mm.

[0016] Furthermore, the variable diameter ring is located in the middle part of the lower structure. The variable diameter ring can be adapted to office chair lifting gas springs with diameters of 38 mm, 40 mm, or 50 mm. The variable diameter ring is a ring structure and is fitted to the inner wall of the receiving cavity of the main body of the fixture. Different sizes of variable diameter rings can be replaced to adapt to office chair lifting gas springs with corresponding diameters.

[0017] Furthermore, the lower locking component includes a lower fixing screw, which passes through the opening and closing end of the lower structure of the main body of the fixture. By tightening the lower fixing screw, the lower structure can be fixed to the office chair lifting gas spring. By loosening the lower fixing screw, the lower structure can be released from the lock on the office chair lifting gas spring, so that the main body of the fixture can open and close.

[0018] Furthermore, the upper locking component includes a quick-release wrench, a screw knob, and an upper fixing screw, and the linkage structure between the quick-release wrench and the screw knob and the upper fixing screw are two locking methods that can be used interchangeably.

[0019] When the quick-release wrench and screw knob are linked: the screw knob is inserted through the opening and closing end of the upper structure of the main body of the fixing device. The quick-release wrench and the screw knob are linked. By driving the screw knob to rotate and tighten through the quick-release wrench, the upper structure and the office chair lifting gas spring can be initially locked. Then, by closing the quick-release wrench, the upper structure can be finally locked to the office chair lifting gas spring. By opening the quick-release wrench, rotating the screw knob in the opposite direction and loosening it, the upper structure can be released from the lock on the office chair lifting gas spring.

[0020] Alternatively, when using an upper fixing screw: by tightening the upper fixing screw that passes through the opening and closing end of the upper structure, a stable lock between the upper structure and the office chair's lifting gas spring can be directly achieved; by loosening the upper fixing screw, the lock can be released.

[0021] Furthermore, the variable diameter ring includes at least two semi-annular structures, which correspond to the receiving cavity portion of the lower structure of the fixture body. When the fixture body is closed, they are spliced ​​together to form a complete ring to accommodate the gas spring of the office chair.

[0022] Furthermore, each of the semi-annular structures is provided with a clearance groove. During the process of the lower structure of the fixing body closing and locking the office chair lifting gas rod, the clearance groove provides space for the deformation of the semi-annular structure, so that the two semi-annular structures can fit more tightly against the outer wall of the office chair lifting gas rod, thereby enhancing the fit and stability between the variable diameter ring and the office chair lifting gas rod.

[0023] Furthermore, the main body of the fixture is made of 6061 T6 aviation aluminum material that has undergone hardening treatment and is formed by CNC machining.

[0024] The present invention, by adopting the above technical solution, has at least the following beneficial effects:

[0025] In this invention, by setting a variable diameter ring adapted to 38 mm, 40 mm and 50 mm diameters in the receiving cavity of the main body of the fixation device, and by having the variable diameter ring fit the inner wall of the receiving cavity and be replaceable as needed, the invention effectively solves the single specification defect of the existing technology that can only adapt to 50 mm diameter gas springs with locking function. It can cover the mainstream lifting gas spring specifications in the office chair field, greatly improving the versatility of the fixation device. Users do not need to purchase special locking parts to adapt to different gas spring specifications, thus reducing the cost of use.

[0026] In this utility model, the main body of the fixing device is designed as an openable double-layer structure. The lower layer structure is rotatably connected to the upper layer structure through a hinge structure. During installation, there is no need to disassemble the original parts such as the office chair seat cushion and chassis. Simply open the double-layer structure to cover the original gas spring of the office chair and lock it to achieve non-destructive installation. This completely avoids the cumbersome operation caused by replacing the gas spring in the existing solution. Ordinary users can complete the installation independently. At the same time, it prevents wear or damage to the seat parts during disassembly and reassembly, and ensures the overall service life of the office chair.

[0027] In this utility model, the upper locking component provides two locking methods: a linkage structure between a quick-release wrench and a screw knob, and an upper fixing screw. This satisfies the convenient need for quick locking / unlocking (such as when a student's chair needs to frequently switch states, the quick-release wrench can be used for efficient operation), while the upper fixing screw can achieve a more stable locking effect (such as when a chair for patients with lumbar / spinal diseases requires high stability, the screw fixing can improve the safety of use). This overcomes the shortcomings of existing gas springs that can only achieve a single function and cannot be flexibly switched, and adapts to the functional needs of different scenarios.

[0028] In this invention, the main body of the retainer is made of 6061 T6 aviation aluminum material, which is hardened and machined by CNC process. On the one hand, this ensures the structural strength and durability of the retainer, preventing deformation due to long-term use or stress, and ensuring stable control of the rotation and lifting functions of the gas spring. On the other hand, precision machining reduces dimensional errors, ensuring the smooth opening and closing of the double-layer structure, the fit between the variable diameter ring and the gas spring, and the locking accuracy of the locking components. This further improves the reliability of the retainer and avoids affecting the locking effect due to insufficient machining accuracy. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is one of the structural schematic diagrams of the fixture of this utility model;

[0031] Figure 2 This is one of the structural schematic diagrams of the fixture of this utility model;

[0032] Figure 3 This is one of the structural schematic diagrams of the fixture of this utility model;

[0033] Figure 4 This is one of the structural schematic diagrams of the fixture of this utility model;

[0034] Figure 5 This is a schematic diagram of the bottom surface of the fixture with a variable diameter ring.

[0035] Figure 6 This is one of the structural schematic diagrams of the fixing device of this utility model being fastened to the gas spring;

[0036] Figure 7 This is the second schematic diagram of the structure of the fixing device of this utility model being fastened to the gas spring;

[0037] In the diagram: 1. Main body of the retainer; 2. Variable diameter ring; 3. Lower structure; 4. Upper structure; 5. Lower fixing screw; 6. Quick release wrench; 7. Screw knob; 8. Semi-circular structure; 9. Clearance groove. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0039] Please see Figures 1 to 7 As shown, this embodiment provides a variable diameter double-locking rotary retainer for an office chair gas spring, including a retainer body 1, a variable diameter ring 2, and a locking assembly;

[0040] The main body 1 of the fixation device is an openable double-layer structure, including a lower layer structure 3 and an upper layer structure 4. The lower layer structure 3 and the upper layer structure 4 are connected by a hinge structure to form a receiving cavity for enclosing the gas spring of the office chair.

[0041] The variable diameter ring 2 is located in the receiving cavity of the main body 1 of the fixer, and is used to adapt to the gas spring of office chair with different diameters;

[0042] The locking assembly includes a lower locking member located at the lower part of the fixture body 1 and an upper locking member located at the upper part of the fixture body 1. The lower locking member is used to initially fix the fixture body 1 to the office chair lifting gas spring, and the upper locking member is used to realize the opening and closing locking of the fixture body 1 to control the rotation and lifting functions of the office chair lifting gas spring.

[0043] As one implementation method, the hinge structure in this embodiment is a four-ring interlocking hinge structure. The four-ring interlocking hinge structure is disposed at the non-opening end of the lower structure 3 and the upper structure 4. The lower structure 3 and the upper structure 4 are rotatably connected through the four-ring interlocking hinge structure, so that the two can rotate around the four-ring interlocking hinge structure to achieve opening and closing.

[0044] In one embodiment, the lower structure 3 has a diameter of 50 mm and the upper structure 4 has a diameter of 28 mm.

[0045] In one embodiment, the variable diameter ring 2 is disposed in the middle part of the lower structure 3. The variable diameter ring 2 can be adapted to office chair lifting gas rods with diameters of 38 mm, 40 mm or 50 mm. The variable diameter ring 2 is a ring structure and is fitted to the inner wall of the receiving cavity of the fixing body 1. Different sizes of variable diameter ring 2 can be replaced to adapt to office chair lifting gas rods with corresponding diameters.

[0046] In one embodiment, the lower locking component in this embodiment includes a lower fixing screw 5. The lower fixing screw 5 passes through the opening and closing end of the lower structure 3 of the fixture body 1. By tightening the lower fixing screw 5, the lower structure 3 can be fixed to the office chair lifting gas spring. By loosening the lower fixing screw 5, the lower structure 3 can be released from the lock on the office chair lifting gas spring, so that the fixture body 1 can open and close.

[0047] In one embodiment, the upper locking component includes a quick-release wrench 6, a screw knob 7, and an upper fixing screw. The linkage structure between the quick-release wrench 6 and the screw knob 7 and the upper fixing screw are two locking methods that can be used interchangeably.

[0048] When the quick-release wrench 6 and screw knob 7 are linked: the screw knob 7 is inserted through the opening and closing end of the upper structure 4 of the fixing body 1. The quick-release wrench 6 and screw knob 7 are linked. By driving the screw knob 7 to rotate and tighten through the quick-release wrench 6, the upper structure 4 and the office chair lifting gas spring can be initially locked. Then, by closing the quick-release wrench 6, the upper structure 4 can finally lock the office chair lifting gas spring. By opening the quick-release wrench 6, rotating the screw knob 7 in the opposite direction and loosening it, the upper structure 4 can release the lock on the office chair lifting gas spring.

[0049] Alternatively, when using an upper fixing screw: by tightening the upper fixing screw that passes through the opening and closing end of the upper structure 4, a stable lock between the upper structure 4 and the office chair lifting gas spring can be directly achieved; by loosening the upper fixing screw, the lock can be released.

[0050] In one embodiment, the variable diameter ring 2 in this embodiment includes at least two semi-annular structures 8, which correspond to the receiving cavity portion of the lower structure 3 of the fixture body 1. When the fixture body 1 is closed, they are spliced ​​into a complete ring to adapt to the gas spring of the office chair.

[0051] As one implementation method, each of the semi-annular structures 8 in this embodiment is provided with a clearance groove 9. During the process of the lower structure 3 of the fixing body 1 closing and locking the office chair lifting gas rod, the clearance groove 9 provides space for the deformation of the semi-annular structure 8, so that the two semi-annular structures 8 can fit more tightly against the outer wall of the office chair lifting gas rod, thereby enhancing the fit and stability between the variable diameter ring 2 and the office chair lifting gas rod.

[0052] As one implementation method, the fixture body 1 described in this embodiment is made of 6061 T6 aviation aluminum material that has undergone hardening treatment and is formed by CNC machining.

[0053] Please see Figures 1 to 7 The working principle and application scenarios of this utility model are explained as follows:

[0054] Figures 1 to 4 This is a structural diagram of the fastener, clearly showing the fastener body 1 (double-layer openable structure), lower fixing screw 5, upper quick-release wrench 6, screw knob 7, and reducing ring 2 (the main body relationship when not assembled separately). It intuitively presents the spatial distribution and functional division of each component, providing a structural understanding basis for subsequent installation and functional realization.

[0055] Figure 5 The state after "unscrewing the screws and knobs" is as follows: the lower fixing screw 5 is loosened, the upper quick-release wrench 6 is opened, and the screw knob 7 is loosened. The lower structure 3 and the upper structure 4 of the main body 1 of the retainer can be flexibly opened with the help of the four-ring interlocking hinge structure, leaving an opening space for the "fastening gas spring" operation. This is the premise of non-destructive installation (no need to disassemble the original parts of the office chair, just open the retainer to wrap the gas spring).

[0056] Figure 6 Demonstrating the process of "attaching to the gas spring": Align the open retainer body 1 with the gas spring of the office chair, so that the gas spring is embedded into the retainer's receiving cavity (if the gas spring diameter is 38mm or 40mm, a corresponding diameter reducer ring 2 needs to be installed in the receiving cavity beforehand to ensure that the gas spring and the retainer fit closely); this step demonstrates the advantage of non-destructive installation of "no need to replace the gas spring, directly wrapping the original gas spring", which is suitable for scenarios such as student study chairs, chairs for patients with lumbar / spinal diseases, etc. (no need to damage the original structure of the chair, and functional modification can be quickly achieved).

[0057] Figure 7The operation of "tightening screw knob 7 and closing the wrench" is as follows: First, rotate screw knob 7 to tighten the upper structure 4 towards the gas spring, achieving initial locking between the upper structure and the gas spring; then close the quick-release wrench 6 to further enhance the locking force using the lever principle, completing the quick-release linkage locking. This method is suitable for student learning scenarios: when students briefly adjust their sitting posture, they can quickly open the wrench and loosen the knob to restore the seat's rotation / lifting function; when focusing on studying, it can quickly lock to avoid rotation distracting their attention.

[0058] The fixation device initially secures the lower part to the gas spring through the lower fixing screw 5, and finally locks it in place through the linkage of the quick-release wrench 6 and the screw knob 7 (or you can choose to lock it directly with the upper fixing screw). At this time, the fixation device and the gas spring are tightly connected, stably restricting the rotation and height of the gas spring, meeting the needs of patients with lumbar / spinal diseases for seat stability. When the patient uses the seat, it will not rotate or rise and fall at will, reducing the burden on the spine and relieving pain.

[0059] Figure 5 A separate demonstration of the variable diameter ring 2: The variable diameter ring 2 is a ring structure, and its inner wall can fit with gas springs of 38mm, 40mm, and 50mm diameter. When the gas spring of the office chair is not 50mm in diameter, simply insert the corresponding variable diameter ring 2 into the retainer cavity to achieve the compatibility between the "retainer body 1 (lower diameter 50mm)" and "gas springs of different diameters". This solves the problem that the existing technology can only adapt to the single specification of 50mm locking gas springs, covers the mainstream gas spring specifications in the office chair field, and improves the versatility of the product.

[0060] In practical applications, for student study chairs: students can first unscrew the screws and knobs to open the main body 1 of the retainer and fasten it onto the original gas spring of the office chair. Then, they can tighten the screw knob 7 and close the quick-release wrench 6 to lock it in place. When studying, the retainer restricts the rotation of the chair, preventing students from being distracted by rotation and helping them maintain a good posture. If a short adjustment to the posture or a break between classes is needed, the quick-release wrench 6 can be quickly opened and the screw knob 7 loosened to restore the chair's rotation function. The operation is convenient and efficient.

[0061] For office chairs used by patients with lumbar or spinal disorders: patients or their families can use the adjustable ring 2 to adapt to existing gas springs of different diameters such as 38 mm and 40 mm, without disassembling the seat parts, and directly press... Figures 2 to 5 The steps to complete the fixation device installation are as follows; after locking, the rotation and height adjustment functions of the seat are stably controlled, so patients do not need to worry about the seat moving at will when using it, reducing the burden on the spine, relieving pain, and improving comfort and safety.

[0062] The fixture provided in this implementation achieves non-destructive installation of gas springs of different diameters through the synergistic effect of a double-layer openable structure, variable diameter ring 2, and dual locking components. It also provides a flexible and switchable locking method. Compared with the existing "gas spring replacement" solution, it does not require damage to the original structure of the chair, does not require users to have professional installation skills, and can switch between locking / unlocking states at any time according to the needs of the scenario. It truly solves the problems of single technical specifications, cumbersome installation, and non-switchable functions in the existing technology, and provides a convenient and universal solution for upgrading the functions of office chairs.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A variable-diameter double-locking rotary retainer for a gas spring in an office chair, characterized in that: Includes the retainer body, the reducing ring, and the locking assembly; The main body of the fixation device is an openable double-layer structure, including a lower layer structure and an upper layer structure. The lower layer structure and the upper layer structure are connected by a hinge structure to form a receiving cavity for enclosing the gas spring of the office chair. The variable diameter ring is located in the receiving cavity of the main body of the fixation device, and is used to adapt to the gas spring of office chair with different diameters. The locking assembly includes a lower locking member located at the lower part of the fixture body and an upper locking member located at the upper part of the fixture body. The lower locking member is used to initially fix the fixture body to the office chair lifting gas spring, and the upper locking member is used to realize the opening and closing locking of the fixture body to control the rotation and lifting functions of the office chair lifting gas spring.

2. The variable-diameter double-locking rotary retainer for the gas spring of an office chair according to claim 1, characterized in that: The hinge structure is a four-ring interlocking hinge structure, which is located at the non-opening end of the lower and upper structures. The lower and upper structures are rotatably connected through the four-ring interlocking hinge structure, allowing them to rotate around the four-ring interlocking hinge structure to achieve opening and closing.

3. The variable-diameter double-locking rotary retainer for an office chair gas spring according to claim 1, characterized in that: The lower structure has a diameter of 50 mm, and the upper structure has a diameter of 28 mm.

4. The variable-diameter double-locking rotary retainer for an office chair gas spring according to claim 2, characterized in that: The variable diameter ring is located in the middle part of the lower structure. The variable diameter ring can be adapted to office chair lifting gas springs with diameters of 38 mm, 40 mm or 50 mm. The variable diameter ring is a ring structure and is fitted to the inner wall of the receiving cavity of the main body of the fixation device. Different sizes of variable diameter rings can be replaced to adapt to office chair lifting gas springs with corresponding diameters.

5. The variable-diameter double-locking rotary retainer for an office chair gas spring according to claim 4, characterized in that: The lower locking component includes a lower fixing screw, which passes through the opening and closing end of the lower structure of the main body of the fixture. By tightening the lower fixing screw, the lower structure can be fixed to the gas spring of the office chair. By loosening the lower fixing screw, the lock of the lower structure to the gas spring of the office chair can be released, so that the main body of the fixture can open and close.

6. The variable-diameter double-locking rotary retainer for an office chair gas spring according to claim 5, characterized in that: The upper locking component includes a quick-release wrench, a screw knob, and an upper fixing screw, and the linkage structure between the quick-release wrench and the screw knob and the upper fixing screw are two locking methods that can be used interchangeably. When a linkage structure of quick-release wrench and screw knob is used: the screw knob passes through the opening and closing end of the upper structure of the fixing body. The quick-release wrench and screw knob are linked. By using the quick-release wrench to drive the screw knob to rotate and tighten, the upper structure and the office chair lifting gas spring can be initially locked. Then, closing the quick-release wrench completes the final locking of the upper structure to the office chair lifting gas spring. By opening the quick-release wrench, rotating the screw knob in the opposite direction and loosening it, the locking of the upper structure to the office chair lifting gas spring can be released; or When using upper fixing screws: by tightening the upper fixing screws that pass through the opening and closing end of the upper structure, a stable lock between the upper structure and the office chair lifting gas spring can be directly achieved. By loosening the upper fixing screws, the lock can be released.

7. The variable-diameter double-locking rotary retainer for an office chair gas spring according to any one of claims 1 to 6, characterized in that: The variable diameter ring includes at least two semi-annular structures, which correspond to the receiving cavity portion of the lower structure of the main body of the fixture. When the main body of the fixture is closed, they are spliced ​​together to form a complete ring to fit the gas spring of the office chair.

8. The variable-diameter double-locking rotary retainer for an office chair gas spring according to claim 7, characterized in that: Each of the semi-circular structures is provided with a clearance groove. During the process of the lower structure of the fixing body retracting and locking the office chair lifting gas rod, the clearance groove provides space for the deformation of the semi-circular structure, so that the two semi-circular structures can fit more tightly against the outer wall of the office chair lifting gas rod, thereby enhancing the fit and stability between the variable diameter ring and the office chair lifting gas rod.

9. The variable-diameter double-locking rotary retainer for an office chair gas spring according to any one of claims 1 to 6, characterized in that: The main body of the fixture is made of 6061T6 aviation aluminum material that has been hardened and is formed by CNC machining.

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