An expansion sleeve capable of preventing and correcting errors
By setting limit blocks and reverse teeth on the expansion sleeve, the problem of unstable installation caused by the rotation of the expansion sleeve is solved, realizing tool-free quick installation and stable connection, which meets the convenient needs of furniture production and sales.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU TAIWO DECORATION MATERIALS CO LTD
- Filing Date
- 2025-09-08
- Publication Date
- 2026-06-30
AI Technical Summary
Existing expansion sleeves are unstable during installation due to rotation with the screw, making it impossible to connect effectively. This is especially true on wooden boards with a thickness of ≤9mm, which can easily lead to damage or deformation of the boards. In addition, traditional connectors require tools for installation, which is cumbersome and inconvenient for pre-installation and transportation.
Design an expansion sleeve that can prevent rotation and correct errors. By setting a limiting block and a limiting groove on the sleeve body to prevent the sleeve from rotating, and setting a reverse tooth and an expansion groove on the expansion part to ensure that the expansion direction is consistent, the installation stability is improved.
It enables tool-free installation, improves installation accuracy and stability, avoids damage or deformation of panels, reduces transportation costs and installation difficulty, and meets the convenient needs of furniture production and sales.
Smart Images
Figure CN224433049U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of furniture hardware technology, and in particular to an expansion sleeve that can prevent rotation and correct errors. Background Technology
[0002] A connector is a connecting mechanism used in furniture. It is used to assemble the finished product by installing and locking it onto the pre-processed furniture substrate. Furniture on the market generally uses "three-in-one connectors" or "four-in-one connectors" to connect the panels. However, these methods leave visible holes (eccentric wheels) in the furniture, making the connectors partially or completely visible after assembly. This reduces the overall aesthetics and durability of the furniture, and limits its design flexibility and design possibilities.
[0003] Furniture production and sales are gradually trending towards a front-end sales, back-end manufacturing model. The factory processes the panels, which are then transported to the end consumer for assembly. In this model, economy and convenience are crucial factors to consider both the production and installation processes. Currently, furniture on the market uses "three-in-one connectors" to join panels, which cannot be pre-installed in the factory and must be tightened with screws on-site. This easily leads to problems such as missing, incorrectly installed, or damaged hardware. Since the installation site is often far from the factory, these issues result in very high after-sales costs. Furthermore, the cumbersome on-site installation significantly increases labor costs and can lead to a poor delivery experience for the end consumer.
[0004] Post-production furniture transportation is a crucial part of the delivery service. Using pre-assembled "three-in-one connectors" prevents the flat packaging of panels during transport, increasing transportation costs and the probability of panel damage. This hinders the establishment of the furniture factory's delivery system and is detrimental to improving production efficiency.
[0005] With the widespread adoption of online shopping and efficient furniture sales methods like IKEA, easy packaging, tool-free assembly, and standardized installation of furniture are becoming increasingly important. Traditional three-in-one connectors require a more cumbersome process, more tools, and more steps, which limits their effectiveness in this sales model. The industry trend demands a convenient, robust, tool-free, and quick-assembly connector product.
[0006] The current trend of furniture customization is sweeping the industry, and non-standard size customization and non-standard product production bring greater processing difficulties to furniture manufacturers. The process of assembling cabinets using traditional "three-in-one connectors" requires high precision in hole machining and panel dimensional accuracy. Errors can easily lead to uneven panel placement after cabinet assembly.
[0007] Furniture products often encounter special situations such as after-sales repairs after delivery to the end consumer. Furniture using "three-in-one connectors" to join panels requires disassembling the entire cabinet. In residential environments, cumbersome after-sales service can easily lead to dissatisfaction among end consumers. Therefore, the need for connectors that allow for the removal of individual panels is becoming increasingly important.
[0008] Furthermore, furniture or cabinets assembled and delivered using "three-in-one connectors" often experience loosening of the internal cam lock components after prolonged use, sometimes even detaching from the pre-drilled holes in the panels. This can cause the cabinet structure to become loose and wobbly. Such issues require frequent tightening of the cam locks, making furniture maintenance cumbersome and burdensome. To address this, expansion components such as expansion bolts and expansion sleeves are often used. However, current expansion sleeves require the screw to be rotated during installation, which can cause the sleeve to rotate along with the screw, resulting in incomplete installation. Additionally, for wood panels ≤9mm thick, which have lower strength, expansion of the connector along the width of the panel can easily lead to cracking or deformation of the panel surface. Utility Model Content
[0009] To address the problem in existing technologies where the expansion sleeve rotates with the screw, hindering proper installation, this invention provides an anti-rotation and error-correcting expansion sleeve. This sleeve can be positioned to limit its rotation during installation, preventing it from rotating with the screw and thus ensuring a smoother installation.
[0010] To achieve the above objectives, this utility model provides the following technical solution:
[0011] An anti-rotation and error-correcting expansion sleeve is used for installation in a mounting hole of a plate, the mounting hole having a limiting groove, characterized in that it comprises:
[0012] The sleeve body is cylindrical in shape and has a connecting part and an expansion part. One end of the connecting part is connected to one end of the expansion part. The connecting part and the expansion part are hollow and interconnected. A limiting block is provided on the outer side of the connecting part. The limiting block is adapted to the limiting groove. The expansion part is elastic.
[0013] As described above, the expansion sleeve capable of preventing rotation and correcting errors is further provided with reverse teeth on the outer side of the expansion part, and the reverse teeth are evenly spaced along the height direction of the expansion part.
[0014] As described above, the expansion sleeve capable of preventing rotation and correcting errors further includes threads on the inner side of the connecting portion.
[0015] As described above, the expansion sleeve capable of preventing and correcting errors is further provided with two expansion grooves in the expansion section, which are opened opposite to each other.
[0016] As described above, the expansion sleeve capable of preventing rotation and correcting errors further includes a chamfer on the lower surface edge of the limiting block.
[0017] As described above, the expansion sleeve with anti-rotation and error correction capability further includes a limiting block with an arc shape, and the diameter of the limiting block is the same as the diameter of the connecting part.
[0018] As described above, the expansion sleeve with anti-rotation and error correction capability further includes an upper surface of the limiting block that is flush with the upper surface of the connecting portion.
[0019] As described above, the expansion sleeve capable of preventing rotation and correcting errors further features a smooth outer surface of the connecting portion and a smooth outer surface of the limiting block.
[0020] Compared with the prior art, the advantages of this utility model are as follows:
[0021] The limiting block of this invention can cooperate with the limiting groove in the mounting hole to limit the expansion sleeve during installation, preventing it from rotating with the screw and thus ensuring a smoother installation. During installation, the installation direction of the expansion sleeve is fixed, allowing the expansion portion to expand along the length of the plate, thereby avoiding damage or deformation of the plate due to expansion. This also saves installers time in selecting the direction to tap the accessory. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the expansion sleeve in an embodiment of the present utility model;
[0024] Figure 2 This is a schematic diagram of the expansion sleeve in an embodiment of the present utility model;
[0025] Figure 3 This is a schematic diagram of the structure of the plate (without the expansion sleeve) in the embodiment of this utility model;
[0026] Figure 4 This is a schematic diagram of the structure of the plate (with expansion sleeve installed) in the embodiment of this utility model;
[0027] In the diagram: 1. Sleeve body; 2. Limiting block; 3. Connecting part; 4. Expansion part; 5. Back teeth; 6. Thread; 7. Expansion groove; 8. Chamfer; 9. Plate; 10. Mounting hole; 11. Limiting groove. Detailed Implementation
[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0029] Example:
[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, in the embodiments of this utility model are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.
[0031] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0032] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0034] This utility model provides a technical solution: an expansion sleeve capable of preventing rotation and error correction, used for installation in the mounting hole 10 of a plate 9. The mounting hole 10 has a limiting groove 11 and includes a sleeve body 1. The sleeve body 1 is cylindrical in shape and has a connecting part 3 and an expansion part 4. One end of the connecting part 3 is connected to one end of the expansion part 4. The connecting part 3 and the expansion part 4 are hollow inside and interconnected. A limiting block 2 is provided on the outer side of the connecting part 3. The limiting block 2 is adapted to the limiting groove 11. The expansion part 4 is elastic.
[0035] Specifically, during actual installation, installers sometimes encounter a situation where, when installing the screw into the expansion sleeve, the sleeve rotates along with the screw, making it impossible to securely install the screw within the sleeve. See also... Figures 1 to 4 A limiting block 2 is added to the connecting part 3 of the sleeve body 1. This means that by simply creating a limiting groove 11 in the mounting hole 10 of the plate 9 that matches the size and shape of the limiting block 2, rotation of the expansion sleeve can be effectively prevented during installation, ensuring accurate installation. The expansion part 4 has a certain degree of elasticity; when the screw reaches the expansion part 5, it can push the expansion part 5 outwards, making it tightly fit the inner wall of the mounting hole 10, thus improving the stability of the connection.
[0036] As an optional implementation, in some embodiments, the outer surface of the expansion portion 4 is provided with reverse teeth 5, which are evenly spaced along the height direction of the expansion portion 4. See again Figure 2This allows the inverted teeth 5 to penetrate deep into the inner wall of the mounting hole 10 during expansion of the expansion section 4, increasing the friction between the expansion sleeve and the mounting hole 10, effectively preventing the expansion sleeve from loosening and falling off, and further improving the stability of the connection. The evenly spaced arrangement reduces installation problems such as jamming and misalignment caused by uneven distribution of the inverted teeth 5, improving installation efficiency and quality.
[0037] As an optional implementation, in some embodiments, the inner surface of the connecting portion 3 is provided with threads 6. See again... Figure 1 This allows it to be tightly screwed into the external thread of the screw during installation.
[0038] As an optional implementation, in some embodiments, the expansion portion 4 has two expansion grooves 7, which are opposite to each other. See again... Figure 2 When the expansion sleeve begins to expand under stress, the two opposing expansion grooves 7 provide symmetrical and uniform deformation space for the expansion part 4. This allows the expansion part 4 to expand outward synchronously and uniformly in opposite directions, avoiding stress concentration problems caused by unilateral expansion or uneven expansion. The uniform expansion process ensures more sufficient and tighter contact between the expansion part 4 and the inner wall of the mounting hole 10, thereby further improving the stability of the connection. In addition, for wooden boards with a thickness ≤9mm, due to the low strength of the wooden board, if the expansion part 4 expands along the width direction of the board 9, it is easy to cause cracking or deformation of the surface of the board 9. However, during the installation process, the two expansion grooves 7 can be oriented towards the width direction of the board 9, fixing the installation direction of the expansion sleeve, so that the expansion part 4 can only expand along the length direction of the board 9, thereby avoiding damage or deformation of the board 9 due to expansion. This also saves the installer time in selecting the direction of hammering the accessories.
[0039] As an optional implementation, in some embodiments, the lower surface edge of the limiting block 2 is provided with a chamfer 8. See again... Figure 2 The chamfer 8 can play a guiding role during installation, allowing the limit block 2 to smoothly enter the limit groove 11 of the mounting hole 10, reducing the difficulty of installation and the risk of jamming.
[0040] As an optional implementation, in some embodiments, the limiting block 2 is arc-shaped, and the diameter of the limiting block 2 is the same as the diameter of the connecting portion 3. See again... Figure 4 The symmetrical structural design makes the whole structure more aesthetically pleasing after it is installed into the mounting holes 10 of the plate 9.
[0041] As an optional implementation, in some embodiments, the upper surface of the limiting block 2 is flush with the upper surface of the connecting portion 3. See again... Figure 4This ensures the flatness of the expansion sleeve and plate 9 after installation, reduces installation gaps and stress concentration, and makes the overall appearance more regular, improving the aesthetics of the structure and the stability of installation.
[0042] As an optional implementation, in some embodiments, the outer surface of the connecting portion 3 and the outer surface of the limiting block 2 are smoothly disposed. See again... Figure 1 and Figure 2 This reduces the frictional resistance between the device and the inner wall of the mounting hole 10 and the limiting groove 11 during installation, making the installation smoother. It also reduces wear and prevents debris from being generated due to friction from affecting the connection accuracy and stability.
[0043] Instructions for using this expansion sleeve: See again Figures 1 to 4 First, align the limiting block 2 of the expansion sleeve with the limiting groove 11 of the mounting hole 10. Then, insert the sleeve body 1 into the mounting hole 10 until the upper surfaces of the limiting block 2 and the connecting part 3 are flush with the upper surface of the plate 9. Finally, screw the corresponding connecting part (screw) into the connecting part 3, so that the expansion part 4 is subjected to force and expands outward, thereby allowing the reverse teeth 5 to penetrate into the inner wall of the mounting hole 10 to complete a stable connection.
[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0045] The above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the substance of the content of this utility model should be covered within the scope of protection of this utility model.
Claims
1. An anti-rotation error-correcting expansion sleeve for installation in a mounting hole of a plate member, the mounting hole having a limiting groove, characterized in that, include: The sleeve body is cylindrical in shape and has a connecting part and an expansion part. One end of the connecting part is connected to one end of the expansion part. The connecting part and the expansion part are hollow and interconnected. A limiting block is provided on the outer side of the connecting part. The limiting block is adapted to the limiting groove. The expansion part is elastic.
2. The anti-rotation and error-correctable inflation sleeve of claim 1, wherein, The outer surface of the expansion portion is provided with inverted teeth, which are evenly spaced along the height direction of the expansion portion.
3. The anti-rotation and error-correctable inflation sleeve of claim 1, wherein, The inner surface of the connecting part is provided with threads.
4. The anti-rotation and error-correctable inflation sleeve of claim 1, wherein, The expansion section has two expansion grooves, which are opened opposite each other.
5. The anti-rotation and error-correcting expansion sleeve according to claim 1, characterized in that, The lower surface edge of the limiting block is chamfered.
6. The anti-error correction expansion sleeve according to claim 1, characterized in that, The limiting block is arc-shaped, and its diameter is the same as that of the connecting part.
7. The anti-rotation and error-correcting expansion sleeve according to claim 1, characterized in that, The upper surface of the limiting block is flush with the upper surface of the connecting part.
8. The anti-rotation and error-correcting expansion sleeve according to claim 1, characterized in that, The outer surface of the connecting part and the outer surface of the limiting block are smoothly disposed.