Set screw with self-locking function
By designing a self-locking set screw and using a spring and locking block structure to increase friction, the problem of set screws loosening under vibration is solved, achieving higher connection reliability and safety.
Patent Information
- Application Number
- CN202520497525.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-20
AI Technical Summary
Traditional set screws are prone to loosening in vibrating environments, leading to unstable equipment operation or damage.
A self-locking set screw was designed. When the screw is screwed into the screw hole, it pushes the push rod. The spring and the locking block structure increase the friction to prevent the screw from turning back. The positioning ring and the limiting frame are combined to improve stability.
It significantly reduces the probability of set screws loosening in vibration environments, enhances the safety and reliability of connection points, and is relatively simple to install and use.
Smart Images
Figure CN223839514U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of fastener technology, specifically to a set screw with a self-locking function. Background Technology
[0002] In modern industrial production, set screws, as a common fastener, play an important role in various mechanical equipment and structural assemblies.
[0003] Traditional set screws are fixed by rotating and tightening, but they are prone to loosening due to environmental vibration or external forces, which can lead to unstable operation or even damage to the equipment. Utility Model Content
[0004] To address the shortcomings of existing technologies, this application provides a set screw with a self-locking function, which significantly reduces the probability of loosening in a vibration environment, enhances the safety and reliability of the connection point, and is relatively simple to install and use. It solves the problem that traditional set screws are fixed by rotation and tightening, but are prone to loosening due to environmental vibration or external forces, leading to unstable equipment operation or even damage.
[0005] To achieve the aforementioned goals of significantly reducing the probability of set screws loosening under vibration, enhancing the safety and reliability of connection points, and simplifying installation and use, this application provides the following technical solution: A set screw with a self-locking function, comprising a screw rod, a nut at the top of the screw rod, the nut being hexagonal, a push rod slidingly disposed inside one end of the screw rod, a positioning plate at the top of the push rod, a first spring at the top of the positioning plate, a connecting plate at one end of the first spring, a push frame at one end of the connecting plate, a locking block above the push frame, the outer surface of the middle part of the locking block slidingly disposed within the inner wall of one side of the screw rod, the outer surface of one end of the locking block being inclined, the push frame being L-shaped, and one end of the push frame being located below the inclined outer surface of one end of the locking block.
[0006] With the above solution, when the screw is screwed into the screw hole, the bottom of the screw hole pushes the push rod, causing the push rod to compress the first spring through the positioning plate. In turn, the first spring, through the connecting plate and the push frame, pushes the locking block to extend outward, so that one end of the locking block is tightly attached to the inner wall of the screw hole, increasing the friction with the inner wall of the screw hole and preventing the screw from rotating. This significantly reduces the probability of the set screw loosening under vibration, enhances the safety and reliability of the connection point, and simplifies installation and use.
[0007] Furthermore, a positioning ring is provided on the inner wall of one end of the screw. The positioning ring is located below the positioning plate, and the outer diameter of the positioning plate is larger than the inner diameter of the positioning ring.
[0008] The above solution, using a positioning ring in conjunction with a positioning plate, can prevent the push rod from falling out of the screw, thus improving the stability of the push rod and the first spring.
[0009] Furthermore, the outer surface of the middle part of the push rod is inserted into the inner wall of the middle part of the positioning ring.
[0010] The above solution allows for the fixation of the push rod's movement trajectory by inserting the push rod's outer surface into the inner wall of the positioning ring, thereby improving the stability of the push rod during movement.
[0011] Furthermore, two limiting frames are symmetrically arranged on both sides of the connecting plate. The inner walls of the two limiting frames are slidably disposed on the outer surface of the middle part of the two limiting rods, and one end of the two limiting rods is disposed on the top of the inner wall of one end of the screw.
[0012] The above scheme allows the angle of the connecting plate to be fixed when it moves by sliding the inner wall of the middle of the two limiting frames on the outer surface of the middle of the two limiting rods, thereby improving the stability of the connecting plate when it moves. This, in turn, allows the connecting plate to work with the positioning plate to fix the extension and retraction trajectory of the first spring.
[0013] Furthermore, a telescopic rod is provided on the top of the card block via a fixing plate, and one end of the telescopic rod is fixed to the top of the inner wall of one end of the screw via the fixing plate.
[0014] The above solution, by setting up a telescopic rod and having the outer surface of the middle part of the locking block slide inside the inner wall of one side of the screw, can improve the stability of the locking block when it moves.
[0015] Furthermore, a second spring is provided inside the telescopic rod, with one end of the second spring located on one end of the inner wall of the telescopic outer tube and the other end of the second spring located on one end of the telescopic inner rod.
[0016] With the above solution, the second spring can apply a pulling force to the locking block through the telescopic rod. When the screw is disassembled, the second spring retracts and drives the locking block back into the screw rod, so that the screw can be disassembled smoothly.
[0017] Furthermore, the edge of one end of the screw is rounded.
[0018] The above solution allows the screw to be easily inserted into the threaded hole by rounding the edge of one end, without the need for precise alignment of the screw with the threaded hole.
[0019] Furthermore, the six sides of the top of the nut are beveled, and the six corners of the outer surface of the middle part of the nut are rounded.
[0020] The above solution allows the chamfered edges on the six sides of the nut to make it easy to fit a socket tool onto the nut and tighten it, while the rounded edges on the outer hexagon of the nut's middle surface allow an open-end wrench to be easily fitted onto the nut's middle outer surface and tighten it, making it easier for the tools to work with the nut.
[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects:
[0022] This type of self-locking set screw, when screwed into the screw hole, pushes the push rod at the bottom of the screw hole. The push rod then compresses the first spring through the positioning plate. In turn, the first spring, through the connecting plate and the push frame, pushes the locking block to extend outward, so that one end of the locking block is tightly pressed against the inner wall of the screw hole. This increases the friction between the locking block and the inner wall of the screw hole, preventing the screw from rotating. This significantly reduces the probability of the set screw loosening under vibration, enhances the safety and reliability of the connection point, and is relatively simple to install and use. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural diagram of this application;
[0024] Figure 2 This is a schematic diagram of the structure on the right side of this application;
[0025] Figure 3 This is a three-dimensional sectional view of the structure of this application;
[0026] Figure 4 This is a schematic diagram of the front sectional view of the structure of this application;
[0027] Figure 5 This is a schematic diagram of the exploded structure of this application.
[0028] In the picture:
[0029] 1. Screw; 2. Nut; 3. Push rod; 4. Positioning plate; 5. First spring; 6. Connecting plate; 7. Push frame; 8. Locking block; 9. Positioning ring; 10. Limiting frame; 11. Limiting rod; 12. Telescopic rod; 13. Second spring. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of this application.
[0031] Please see Figure 2 , Figure 3 and Figure 4 This embodiment of a self-locking set screw includes a screw rod 1, a nut 2 on the top of the screw rod 1, the nut 2 being hexagonal, a push rod 3 slidingly disposed inside one end of the screw rod 1, a positioning plate 4 on the top of the push rod 3, a first spring 5 on the top of the positioning plate 4, a connecting plate 6 on one end of the first spring 5, a push frame 7 on one end of the connecting plate 6, a locking block 8 above the push frame 7, the outer surface of the middle part of the locking block 8 slidingly disposed inside the inner wall of one side of the screw rod 1, the outer surface of one end of the locking block 8 being inclined, the push frame 7 being L-shaped, and one end of the push frame 7 being located below the inclined outer surface of one end of the locking block 8.
[0032] Please see Figure 3 , Figure 4 and Figure 5 A positioning ring 9 is provided on the inner wall of one end of the screw 1. The positioning ring 9 is located below the positioning plate 4. The outer diameter of the positioning plate 4 is larger than the inner diameter of the positioning ring 9. The positioning ring 9, in conjunction with the positioning plate 4, can prevent the push rod 3 from falling out of the screw 1, thereby improving the stability of the push rod 3 and the first spring 5.
[0033] Please see Figure 3 , Figure 4 and Figure 5 The outer surface of the middle part of the push rod 3 is inserted into the inner wall of the middle part of the positioning ring 9. By inserting the outer surface of the middle part of the push rod 3 into the inner wall of the middle part of the positioning ring 9, the movement trajectory of the push rod 3 can be fixed, thereby improving the stability of the push rod 3 when it moves.
[0034] Please see Figure 3 , Figure 4 and Figure 5 Two limiting frames 10 are symmetrically arranged on both sides of the connecting plate 6. The inner wall of the middle part of the two limiting frames 10 is slidably set on the outer surface of the middle part of the two limiting rods 11. One end of the two limiting rods 11 is set on the top of the inner wall of one end of the screw 1. By sliding the inner wall of the middle part of the two limiting frames 10 on the outer surface of the middle part of the two limiting rods 11, the angle of the connecting plate 6 when moving can be fixed, thereby improving the stability of the connecting plate 6 when moving. In this way, the connecting plate 6 can cooperate with the positioning plate 4 to fix the extension and retraction trajectory of the first spring 5.
[0035] Please see Figure 3 , Figure 4 and Figure 5 A telescopic rod 12 is provided on the top of the locking block 8 via a fixing plate. One end of the telescopic rod 12 is provided on the top of the inner wall of one end of the screw rod 1 via the fixing plate. The telescopic rod 12, in conjunction with the outer surface of the middle part of the locking block 8 slidingly within the inner wall of one side of the screw rod 1, can improve the stability of the locking block 8 when it moves.
[0036] Please see Figure 3 and Figure 4The telescopic rod 12 is equipped with a second spring 13. One end of the second spring 13 is located on the inner wall of the telescopic outer tube of the telescopic rod 12, and the other end of the second spring 13 is located on the inner telescopic rod of the telescopic rod 12. The second spring 13 can apply a pulling force to the locking block 8 through the telescopic rod 12. When the screw is disassembled, the second spring 13 retracts and drives the locking block 8 to retract into the screw rod 1, so that the screw can be disassembled smoothly.
[0037] Please see Figure 1 , Figure 2 and Figure 5 The edge of one end of the screw 1 is rounded, which makes it easy to insert the screw 1 into the threaded hole without the need to precisely align the screw 1 with the threaded hole.
[0038] Please see Figure 1 , Figure 2 and Figure 5 The six edges at the top of nut 2 are beveled, and the six corners on the outer surface of the middle part of nut 2 are rounded. The beveled edges at the top of nut 2 allow a socket tool to be easily fitted onto nut 2 to tighten it, and the rounded corners on the outer surface of the middle part of nut 2 allow an open-end wrench to be easily fitted onto the outer surface of the middle part of nut 2 to tighten it, making it easier for the tool to work with nut 2.
[0039] In this embodiment, a self-locking set screw is screwed into a screw hole by the screw rod 1. The bottom of the screw hole pushes the push rod 3, causing the push rod 3 to compress the first spring 5 through the positioning plate 4. In turn, the first spring 5, through the connecting plate 6 and the push frame 7, pushes the locking block 8 to extend outward, so that one end of the locking block 8 is tightly attached to the inner wall of the screw hole, increasing the friction with the inner wall of the screw hole and preventing the screw from rotating. This significantly reduces the probability of the set screw loosening under vibration, enhances the safety and reliability of the connection point, and simplifies installation and use.
[0040] The working principle of the above embodiment is as follows: The screw 1 is inserted into the screw hole, and the nut 2 is rotated using a tool, causing the screw 1 to gradually screw into the screw hole. When one end of the push rod 3 contacts the bottom of the screw hole, the push rod 3 inserts into the screw 1. This, combined with the positioning plate 4, pushes and compresses the first spring 5, gradually increasing the upward thrust of the first spring 5 on the connecting plate 6. This causes the first spring 5 to move the connecting plate 6 upward, leading to one end of the push frame 7 contacting the inclined outer surface of one end of the locking block 8. The push frame 7 then applies a force to the locking block 8 through the inclined outer surface of one end of the locking block 8, expanding outwards towards the screw 1. Since the first spring 5 is not compressed to the specified degree, it cannot apply a large outward expansion force to the locking block 8, allowing the screw 1 to continue screwing into the screw hole, thus enabling smooth screw-in installation. The push rod 3 continuously compresses the first spring 5, increasing the upward thrust of the first spring 5 on the connecting plate 6. This allows the connecting plate 6 to push the locking block 8 out of the screw 1 through the push frame 7. Simultaneously, the locking block 8 drives the telescopic rod 12 to extend, stretching the second spring 13. This causes one end of the locking block 8 to fit tightly against the inner wall of the screw hole, creating frictional resistance between the locking block 8 and the inner wall of the screw hole. This forms an effective mechanical self-locking state, preventing the screw from loosening during subsequent use. When it is necessary to remove the screw, a greater release force is applied to rotate the screw 1, gradually unscrewing the screw 1 out of the screw hole. At the same time, the upward thrust of the first spring 5 on the connecting plate 6 gradually decreases, causing the second spring 13 to contract. This contractes the telescopic rod 12, causing the telescopic rod 12 to retract the locking block 8 back into the screw 1, allowing the screw 1 to be smoothly unscrewed from the screw hole.
[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0042] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A set screw with a self-locking function, comprising a screw (1), characterized in that: The screw (1) is provided with a nut (2) at the top. The nut (2) is hexagonal. A push rod (3) is slidably provided inside one end of the screw (1). A positioning plate (4) is provided at the top of the push rod (3). A first spring (5) is provided at the top of the positioning plate (4). A connecting plate (6) is provided at one end of the first spring (5). A push frame (7) is provided at one end of the connecting plate (6). A locking block (8) is provided above the push frame (7). The outer surface of the middle part of the locking block (8) is slidably provided inside the inner wall of one side of the screw (1). The outer surface of one end of the locking block (8) is inclined. The push frame (7) is L-shaped. One end of the push frame (7) is located below the inclined outer surface of one end of the locking block (8).
2. A set screw with self-locking function according to claim 1, characterized in that: A positioning ring (9) is provided on the inner wall of one end of the screw (1). The positioning ring (9) is located below the positioning plate (4). The outer diameter of the positioning plate (4) is larger than the inner diameter of the positioning ring (9).
3. A set screw with self-locking function according to claim 1, characterized in that: The outer surface of the middle part of the push rod (3) is inserted into the inner wall of the middle part of the positioning ring (9).
4. A set screw with self-locking function according to claim 1, characterized in that: Two limiting frames (10) are symmetrically arranged on both sides of the connecting plate (6). The inner wall of the middle part of the two limiting frames (10) is slidably arranged on the outer surface of the middle part of the two limiting rods (11). One end of the two limiting rods (11) is arranged on the top of the inner wall of one end of the screw (1).
5. A set screw with self-locking function according to claim 1, characterized in that: The top of the card block (8) is provided with a telescopic rod (12) through a fixing plate, and one end of the telescopic rod (12) is provided on the top of the inner wall of one end of the screw (1) through a fixing plate.
6. A set screw with self-locking function according to claim 5, characterized in that: The telescopic rod (12) is provided with a second spring (13). One end of the second spring (13) is located on one end of the inner wall of the telescopic outer tube of the telescopic rod (12), and the other end of the second spring (13) is located on one end of the telescopic inner rod of the telescopic rod (12).
7. A set screw with self-locking function according to claim 1, characterized in that: The edge of one end of the screw (1) is rounded.
8. A set screw with self-locking function according to claim 1, characterized in that: The six sides of the top of the nut (2) are chamfered, and the six corners of the outer surface of the middle part of the nut (2) are rounded.