Split riveting forming anti-lock knob shaft

Abstract

The utility model discloses a split riveting forming's counter lock knob axle, including knob outer cover, knob inner cover and lock axle, knob outer cover and knob inner cover mutually lock together and form the rotation -proof limit position cooperation, and knob inner cover is equipped with riveting hole, and lock axle is equipped with riveting post, and both pass through cold riveting and fix. Lock axle is by metal sheet material through continuous stamping, cutting, stamping and coiling procedure integral forming, and the outer circumference is equipped with dovetail groove and annular groove, and the end is equipped with the metal cover plate with recess. Knob inner cover is equipped with the boss of stamping and forming on, knob outer cover, knob inner cover are all metal sheet material through stamping, deep -drawing and forming's hollow cylinder structure, and the circumference surface of knob outer cover is equipped with antiskid groove or upper end is equipped with smooth flat operation part. The utility model discloses adopt continuous stamping to replace traditional aluminum die casting, and material utilization is high, and production efficiency is high, and riveting connection firm, transmission stable, is applicable to various handle locks, anti -theft lock, house door lock and so on mechanical lock, and the comprehensive cost and reliability are obviously superior to die casting product.

Description

Technical Field

[0001] This utility model relates to the field of lock component technology, specifically to a split riveted deadbolt knob shaft structure. Background Technology

[0002] The deadbolt knob is a small knob located on the inside of a door for physical locking. It is a core transmission component of various mechanical locks such as lever locks, security locks, and room door locks. It is generally connected to a lock shaft, referred to here as the deadbolt knob shaft. Its main functions include inputting operating force, transmitting torque, driving the lock cylinder, and controlling the bolt. As the part directly gripped and applying force, the deadbolt knob requires sufficient structural strength, grip stability, and durability. The lock shaft, as the intermediate transmission component connecting the knob to the lock cylinder and lock body, requires a reliable anti-rotation positioning structure and assembly stability. Its structure and connection reliability directly determine the lock's opening and closing feel, service life, and resistance to forced entry.

[0003] Currently, the mainstream manufacturing method for locking knob shafts in the industry is aluminum alloy die casting. This involves injecting molten aluminum alloy into a mold cavity under high pressure and high speed, and then cooling it to form an integrated structure or integral component of the knob and locking shaft. While this process can achieve complex shapes in one step, it has many inherent drawbacks in actual production and use, such as high energy consumption and high equipment and mold costs. Aluminum die casting requires heating aluminum material to a molten state of 600℃–700℃ or higher, resulting in huge energy consumption. Investment in equipment such as die casting machines, melting furnaces, and mold temperature controllers is high. Mold structures are complex, processing cycles are long, and mold modifications are difficult and expensive when product specifications change, hindering multi-variety, small-batch, and rapid iterative production. Furthermore, aluminum alloy die casting has low material utilization and generates a large amount of waste. Die casting requires auxiliary structures such as gates, runners, overflow channels, and venting channels, which need to be removed after forming, generating a large amount of waste. The actual material utilization rate is usually less than 70%, and a large amount of aluminum alloy waste needs to be remelted and recycled, further increasing energy consumption and costs. Meanwhile, issues such as aluminum oxidation, inclusions, and cold shuts lead to high scrap rates, further increasing production costs. Furthermore, aluminum alloy die casting presents a poor production environment with significant safety and environmental challenges. High-temperature molten aluminum poses risks of burns and fires; the die casting process generates fumes, dust, and noise, which contradicts green manufacturing trends. As environmental requirements become increasingly stringent, the environmental costs of traditional die casting processes continue to rise.

[0004] In summary, traditional aluminum die-casting processes have significant shortcomings in terms of strength, reliability, production cost, production efficiency, and environmental safety, making it difficult to meet the lock industry's development needs for high quality, low cost, high efficiency, and green manufacturing. Utility Model Content

[0005] The purpose of this invention is to overcome the various defects of existing aluminum die-cast locking knob shafts and provide a split-type riveted locking knob shaft that offers faster production efficiency, higher material utilization, lower cost, and greater environmental friendliness and safety. This invention replaces aluminum die-casting with a continuous metal sheet stamping process and adopts a split-type forming + riveting fixing structural design, fundamentally solving problems such as high waste, high energy consumption, and complex post-processing in die-casting parts, effectively improving production efficiency and product market competitiveness.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a split-type riveted locking knob shaft, composed of three parts: an outer knob cover, an inner knob cover, and a locking shaft; the outer knob cover and the inner knob cover interlock to form an anti-rotation limiting fit, preventing relative rotation or axial slippage after assembly, thus ensuring the stability of the overall structure; the inner knob cover has riveting holes, and the locking shaft has riveting posts, which pass through the riveting holes and are then pressed and compacted using a cold riveting process, forming a non-removable and secure connection between the locking shaft and the inner knob cover, ensuring stable torque transmission. The inner knob cover has stamped bosses for structural reinforcement, acting as reinforcing ribs.

[0007] Furthermore, the lock shaft is integrally formed from a metal sheet through continuous stamping, cutting, and stamping rolling processes, resulting in a hollow cylindrical component. Stamping and rolling of the metal sheet is a common technique in this industry. The outer circumference of the lock shaft is integrally stamped with a dovetail groove, which is set along the circumference and used for surface shaping of the hollow cylindrical component formed by stamping and rolling the metal sheet, ensuring that the cylindrical component does not deform during use. A metal cover plate is integrally provided at the end of the lock shaft, and a groove is formed on the metal cover plate. This groove is used for transmission with the lock cylinder and lock tongue, achieving precise transmission of rotational power. The outer circumference of the lock shaft also has multiple annular grooves, which can be used to install sealing rings, snap rings, retaining rings, and other accessories, achieving axial positioning, dustproofing, waterproofing, and wear reduction functions.

[0008] Furthermore, the number of rivet pins on the locking shaft is no less than two, and they are evenly distributed along the circumference of the locking shaft. As a result, the torque is evenly distributed to multiple connection points, forming multi-point force and circumferential constraint, ensuring that the torque transmission has no dead angles and no slippage, and greatly improving the reliability of the transmission.

[0009] Furthermore, the outer contour of the inner cover of the knob matches the inner contour of the outer cover of the knob, and the two cannot slide or rotate relative to each other after they are fastened together; the surface of the outer cover of the knob is provided with anti-slip grooves, which are multiple groove structures distributed along the circumference or axis, to improve grip friction and make it more comfortable and stable to use.

[0010] Furthermore, both the outer and inner knob covers are hollow cylindrical structures formed by stamping and deep drawing of metal sheets, resulting in uniform wall thickness, smooth surface, and high dimensional accuracy. Stamping and deep drawing are common techniques in this industry. Additionally, the outer knob cover can also be a quincunx-shaped or square hollow cylinder.

[0011] Furthermore, the upper end of the knob cover is provided with an operating part adapted to be held by fingers. The operating part is a smooth, flat contact surface with a rounded transition at the top, which is used for the user to apply rotational torque to drive the knob to rotate.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: The lock shaft and the inner cover of the knob are fixed by cold riveting with riveting pins and riveting holes, resulting in high connection strength, good coaxiality, and the ability to withstand large torques without loosening or slipping, ensuring reliable transmission. Material utilization is high, and costs are significantly reduced; the material usage of this structure is more than 50% less compared to aluminum die-casting. High-temperature smelting is eliminated, significantly reducing energy consumption; mold costs are low, lifespan is long, and replacement is quick, resulting in a significant reduction in overall production costs. Multi-station continuous stamping allows feeding, blanking, deep drawing, and rolling to be completed in one operation, resulting in high production efficiency, stable processes, good dimensional consistency, and no need for extensive post-processing grinding. Furthermore, the production process is free of high-temperature aluminum liquid, smoke and dust, and high noise pollution, making the production process safer and more environmentally friendly. Different specifications of locks can be adapted by adjusting the mold size, allowing for rapid product iteration and a short development cycle, meeting the needs of various scenarios such as door locks, security locks, glass locks, and bathroom locks. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the anti-locking knob shaft structure of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the anti-locking knob shaft structure of this utility model;

[0015] Figure 3 In this utility model Figure 2 Enlarged view of part A;

[0016] Figure 4 This is an exploded view of the structure of the anti-locking knob shaft of this utility model.

[0017] Figure 5 This is a schematic diagram illustrating the application scenario of the anti-locking knob shaft of this utility model.

[0018] Figure 6 is a structural schematic diagram of another embodiment of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1—Outer cover of the knob; 11—Anti-slip groove; 12—Operating part; 2—Inner cover of the knob; 21—Rivet hole; 22—Boss; 3—Locking shaft; 31—Rivet post; 32—Annular groove; 33—Groove; 34—Dovetail groove. Detailed Implementation

[0020] The technical solutions of the present utility model 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 the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] like Figure 1 As shown in –4, this embodiment provides a split riveted locking knob shaft, which adopts a combination of continuous stamping split forming and cold riveting fixing, completely abandoning the traditional aluminum alloy die casting process. The overall structure includes a knob outer cover 1, a knob inner cover 2 and a locking shaft 3 that are assembled together. The three work together to realize the power transmission and opening and closing control of the lock.

[0022] In this embodiment, both the outer cover 1 and the inner cover 2 of the knob are made of metal sheet through stamping and deep drawing to form a hollow cylindrical structure. The structural dimensions of the two are matched, and the outer contour of the inner cover 2 and the inner contour of the outer cover 1 of the knob are precisely fitted. During assembly, the two interlock to form a reliable anti-rotation limiting fit, ensuring that no relative sliding or rotation can occur after interlocking, thereby ensuring the stability of the overall structure of the lock handle. The inner cover 2 of the knob is provided with a stamped boss 22 for structural reinforcement and assembly positioning. At the same time, the outer surface of the outer cover 1 of the knob is integrally stamped with an anti-slip groove 11. The anti-slip groove 11 is a structure of multiple grooves evenly distributed along the circumference, which can effectively improve the friction when the user holds it, taking into account both operating comfort and usage stability.

[0023] As the core transmission component of the entire locking knob shaft, the locking shaft 3 is integrally formed from a single metal sheet through continuous stamping, cutting, and stamping rolling processes. The overall structure is a hollow cylindrical component with dovetail grooves 34 on its outer circumference. The material has a dense structure and high dimensional accuracy, while significantly improving material utilization. At least two riveting posts 31 are integrally formed at the end of the locking shaft 3 closest to the inner knob cover 2, evenly distributed along the circumference of the locking shaft 3. These posts correspond one-to-one with the riveting holes 21 in the central area of ​​the inner knob cover 2. During assembly, the riveting posts 31 are inserted into the corresponding riveting holes 21, and then cold riveting is used to thicken and compact the riveting posts 31, forming a non-removable and secure connection between the locking shaft 3 and the inner knob cover 2, ensuring stable and reliable torque transmission between them.

[0024] The outer circumferential surface of the lock shaft 3 is integrally stamped with a dovetail groove 34, which is used for stamping, rolling and shaping and preventing deformation during use; the outer circumferential surface of the lock shaft 3 is also provided with several annular grooves 32, which can be used to install accessories such as sealing rings, snap rings, and retaining rings to achieve axial positioning, dustproof, waterproof and wear-reducing functions; the end of the lock shaft 3 is integrally provided with a metal cover plate, which has a groove 33. The groove 33 is used to drive the lock cylinder to achieve precise transmission of rotational power, thereby driving the lock tongue inside the lock body to move. Figure 5 This is a schematic diagram of the usage scenario where the deadbolt knob shaft of this utility model is installed on the inside of the lever handle lock. The deadbolt knob shaft is connected to the lock cylinder and lock tongue through the groove 33 at the end of the lock shaft 3. The knob cover 1 is for the user to hold and rotate, so as to realize the deadbolt and unlocking operation of the lock.

[0025] In this embodiment, the locking knob shaft follows the principle of split molding and integrated assembly. The riveting post 31 of the locking shaft 3 is precisely inserted into the riveting hole 21 of the inner cover 2 of the knob. The riveting post 31 is uptaken and compacted by a cold riveting device to complete the fixed connection between the locking shaft 3 and the inner cover 2 of the knob, ensuring the coaxiality and connection strength of the two. The inner cover 2 of the knob and the outer cover 1 of the knob are interlocked, and the contour matching relationship between the two forms an anti-rotation limit, forming a complete locking knob shaft assembly. Example 2

[0026] like Figure 6 As shown, in this embodiment, the upper end of the knob cover 1 is provided with an operating part 12 adapted for finger grip. The operating part 12 is a smooth, flat contact surface with a rounded transition at the top, used for the user to apply rotational torque to drive the knob to rotate. The rest of the structure is the same as in Embodiment 1, and will not be described again here.

[0027] All components of the entire deadbolt knob shaft are manufactured using a continuous stamping process, resulting in high production efficiency and stable technology. Furthermore, it eliminates the need for high-temperature smelting, producing no smoke, dust, or high noise pollution, making the production process safer and more environmentally friendly. Simultaneously, by adjusting the mold dimensions, it can quickly adapt to different lock specifications, enabling rapid product iteration and a short development cycle. It can meet the needs of various scenarios, including door locks, security locks, glass locks, and bathroom locks, possessing excellent industrial practicality and market promotion value.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A split-type riveted locking knob shaft, characterized in that, The locking knob shaft consists of three parts: an outer knob cover, an inner knob cover, and a locking shaft. The outer knob cover and the inner knob cover are interlocked to form an anti-rotation limiting fit. The inner knob cover is provided with a riveting hole, and the locking shaft is provided with a riveting post. The locking shaft and the inner knob cover are cold-riveted to each other by the riveting post and the riveting hole.

2. The split-riveted locking knob shaft according to claim 1, characterized in that, The locking shaft is integrally formed from a single metal sheet through continuous stamping, cutting, and stamping rolling processes. The locking shaft is a hollow cylindrical component with a dovetail groove on its outer circumference.

3. The split-piece riveted locking knob shaft according to claim 2, characterized in that, The end of the lock shaft is integrally provided with a metal cover plate, and the metal cover plate has a groove for transmission with the lock cylinder and lock tongue; the outer circumferential surface of the lock shaft is also provided with several annular grooves.

4. The split-riveted locking knob shaft according to claim 3, characterized in that, The number of rivet pins on the locking shaft is not less than two, and they are evenly distributed along the circumference of the locking shaft.

5. The split-piece riveted locking knob shaft according to claim 1, characterized in that, The outer contour of the inner cover of the knob matches the inner contour of the outer cover of the knob, and the two cannot slide or rotate relative to each other after they are fastened together.

6. The split-piece riveted locking knob shaft according to claim 5, characterized in that, Both the outer and inner covers of the knob are hollow cylindrical structures formed by stamping and deep drawing of metal sheets.

7. The split-riveted locking knob shaft according to claim 6, characterized in that; The knob cover is cylindrical, and the circumferential surface of the knob cover is provided with anti-slip grooves for the user to apply torque to drive the knob to rotate.

8. The split-riveted locking knob shaft according to claim 6, characterized in that; The upper end of the knob cover is provided with an operating part adapted to be held by fingers. The operating part is a smooth, flat contact surface with a rounded transition at the top.

9. The split-riveted locking knob shaft according to claim 5, characterized in that, The inner cover of the knob is provided with a stamped boss.

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