Unilateral falling-resistant screw

Abstract

The utility model discloses a single-side falling-resistant screw. The single-side falling-resistant screw comprises a screw head and a screw rod fixedly connected with the screw head. A tight supporting mechanism is arranged at the bottom of the screw head and comprises a gasket inserted into the screw rod and a connecting spring connected with the gasket and the screw head. A first thread and a pit are arranged on the surface of the screw rod, a second thread which is the same as the screw rod is arranged at the bottom of the pit, and a height difference is formed between the first thread and the second thread; and a falling-resistant resin layer is arranged in the pit. According to the utility model, the concave pit is arranged, and the anti-falling resin is arranged in the concave pit, so that the friction force in the screwing process is increased, the anti-loosening performance of threaded connection is obviously improved, the screw is prevented from falling off from the corresponding hole in the use process, and the connection reliability is ensured.

Description

Technical Field

[0001] This utility model relates to the field of household cleaning products, and in particular to a single-sided anti-fall screw. Background Technology

[0002] There are many reasons why screws may loosen, mainly including movement, vibration, impact, and temperature changes. These factors can cause a sudden loss of clamping force between workpieces, leading to screw loosening.

[0003] To enhance the friction during screw tightening, current market Narrow screws require a full resin coating on the screw surface. However, this resin coating requires greater torque to tighten the screws into the correct position, which can damage the product or the screws. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a single-sided anti-loosening screw. By setting a pit and setting anti-loosening resin in the pit, the friction during the tightening process is increased, which significantly improves the anti-loosening performance of the threaded connection, prevents the screw from falling out of the corresponding hole during use, and ensures the reliability of the connection.

[0005] Accordingly, this utility model proposes a single-sided anti-fall screw, which includes: a screw head and a screw rod fixedly connected to the screw head;

[0006] The bottom of the screw head is provided with a tensioning mechanism, which includes a washer inserted on the screw rod and a connecting spring connecting the washer and the screw head;

[0007] The screw has a first thread and a recess on its surface. The bottom of the recess has a second thread that is the same as that of the screw, and there is a height difference between the first thread and the second thread.

[0008] A layer of durable resin is provided inside the recess.

[0009] Preferably, the screw head has a corresponding snap-fit ​​groove, and the snap-fit ​​groove is shaped as a cross groove, a plum blossom groove, or a slotted groove.

[0010] Preferably, the single-sided locking screw has a lubrication hole located at the bottom of the snap-fit ​​groove. The lubrication hole includes a main hole and multiple branch holes, and the multiple branch holes communicate with the main hole.

[0011] Preferably, the radius of the main hole is R1 and the radius of the sub-hole is R2, satisfying the relationship: R1 > R2.

[0012] Preferably, the plurality of the branch holes are located at the ends of the main hole, and the branch holes connect the main hole to the external environment.

[0013] Preferably, the included angle α formed between two adjacent holes is the same.

[0014] Preferably, the bottom of the resistant resin layer is in close contact with the second thread, and the shape of the resistant resin layer is the same as that of the second thread.

[0015] Preferably, the side of the gasket away from the screw head extends toward the end of the screw to form a plurality of wavy connecting portions.

[0016] Preferably, the edge of the end of the screw is recessed inward to form a chamfer.

[0017] Preferably, the gasket is made of plastic or metal.

[0018] The beneficial effects of this utility model are:

[0019] This invention improves the anti-loosening performance of threaded connections by setting recesses and filling them with resistant resin, increasing friction during tightening, and preventing screws from falling out of their corresponding holes during use, thus ensuring connection reliability. Furthermore, this invention incorporates a tensioning mechanism. When a single-sided resistant screw is tightened onto its corresponding mounting surface, the tensioning mechanism is subjected to pressure from the screw head and the mounting surface, while simultaneously exerting a reaction force on both, allowing the tensioning mechanism to be firmly extended and strengthening the screw connection. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the first structure of the single-sided anti-fall screw in this utility model;

[0022] Figure 2 This is a schematic diagram of the second structure of the single-sided anti-fall screw in this utility model;

[0023] Figure 3 This is a cross-sectional view of the single-sided anti-fall screw in this new type of application.

[0024] In the attached diagram, 1 is the screw head; 11 is the snap-fit ​​groove; 2 is the screw rod; 21 is the first thread; 22 is the recess; 221 is the second thread; 222 is the resistant resin layer; 3 is the tensioning mechanism; 31 is the gasket; 311 is the connecting part; 32 is the connecting spring; 4 is the lubrication hole; 41 is the main hole; and 42 is the branch hole. Detailed Implementation

[0025] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Figure 1 This diagram shows the first structural schematic of the single-sided anti-fall screw of this utility model. Figure 2 This diagram shows a second structural schematic of the single-sided anti-fall screw of this invention. Figure 3 A cross-sectional view of a single-sided anti-fall screw of the present invention is shown. The single-sided anti-fall screw includes: a screw head 1 and a screw rod 2 fixedly connected to the screw head 1; a tensioning mechanism 3 is provided at the bottom of the screw head 1, the tensioning mechanism 3 includes a washer 31 inserted on the screw rod 2 and a connecting spring 32 connecting the washer 31 and the screw head 1; a first thread 21 and a recess 22 are provided on the surface of the screw rod 2, the bottom of the recess 22 has a second thread 221 identical to that of the screw rod 2, and a height difference is formed between the first thread 21 and the second thread 221; an anti-fall resin layer 222 is provided in the recess 22. The screw head 1 and the screw rod 2 are integrally formed. The tightening mechanism 3 is used to enhance the friction between the screw and the mounting surface. When a single-sided anti-loosening screw is tightened on the corresponding mounting surface, the tightening mechanism 3 is subjected to pressure from the screw head 1 and the corresponding mounting surface. At the same time, the tightening mechanism 3 has a reaction force on the screw head 1 and the corresponding mounting surface, so that the tightening mechanism 3 is steadily opened, strengthening the connection strength of the screw. The anti-loosening resin layer 222 is used to increase the friction during the tightening process by increasing its rebound force, significantly improving the anti-loosening performance of the threaded connection. Under vibration or impact environment, the resin layer can maintain a stable coefficient of friction, preventing the screw from falling out of the corresponding hole during use and ensuring its connection reliability. The anti-loosening resin layer 222 is coated on the second thread 221 of the recess 22. When a single-sided anti-loosening screw is screwed into the corresponding hole, it can smoothly transition from the first thread 21 to the anti-loosening resin layer 222 and then from the anti-loosening resin layer 222 back to the first thread 21, improving the efficiency of tightening the screw.

[0027] It should be noted that the recess 22 is located in the area after the fourth tooth on the surface of the screw 2. This avoids the recess 22 being located at the end of the screw 2, which would increase the difficulty of driving the screw into the corresponding hole and reduce the risk of damage to the screw or product due to excessive torque adjustment required to drive the screw in.

[0028] Furthermore, the screw head 1 has a corresponding locking groove 11, which is shaped as a Phillips head, a Torx head, or a slotted head. In this embodiment, the edges of the locking groove 11 are finely chamfered to form a smooth arc transition, avoiding damage to the screwdriver tip when using a screwdriver, and also reducing resistance during operation, making installation and disassembly smoother. When the locking groove 11 is a Phillips head, it has good self-locking performance. When the screwdriver is inserted into the corresponding Phillips head, the groove wall matches the screwdriver tip, improving the safety of the equipment. When the locking groove 11 is a Torx head, it can distribute the load and reduce local stress concentration through multiple planes or arc surfaces that cooperate with the key, thereby improving the stability and reliability of torque transmission. When the locking groove 11 is a slotted head, it has a simple structure, strong tool versatility, and even if the tool is worn or damaged, it is easy to find a replacement.

[0029] Furthermore, the single-sided locking screw has a lubrication hole 4 located at the bottom of the snap-fit ​​groove 11. The lubrication hole 4 includes a main hole 41 and multiple branch holes 42, which communicate with the main hole 41. In this embodiment, the lubrication hole 4 includes one main hole 41 and four branch holes 42. The lubrication hole 4 is used to direct lubricating oil to the surface of the single-sided locking screw. As the screw rotates and friction intensifies, the temperature between the screw and the thread of the connected part rises. The lubricating oil becomes less viscous and more fluid after being heated. At this time, the lubricating oil in the main hole 41 flows through the branch holes 42 to the four branch holes 42 under the action of gravity and thermal expansion and contraction, and then flows from the branch holes 42 to the various parts that need lubrication, i.e., the surface of the single-sided locking screw. This can fill the gaps between the threads, reduce thread wear, and improve the screw's tightening force and anti-loosening performance.

[0030] Furthermore, the radius of the main hole 41 is R1, and the radius of the branch hole 42 is R2, satisfying the relationship: R1 > R2. The four branch holes 42 are radially distributed around the main hole 41, and the axes of the four branch holes 42 are located on the same horizontal plane, ensuring that the four branch holes 42 can evenly distribute the lubricating oil in the main hole 41. Moreover, the radius of the main hole 41 is larger than the radius of the branch holes 42. When the lubricating oil flows from the main hole 41 to the branch holes 42, the branch holes 42 restrict the flow rate of the lubricating oil, ensuring that the lubricating oil is released slowly and prolonging the lubrication cycle. This design realizes a "storage-guidance" staged design, which not only ensures the supply of lubricating oil but also reduces the risk of excessive leakage.

[0031] Furthermore, multiple branch holes 42 are located at the ends of the main hole 41, and the branch holes 42 connect the main hole 41 to the external environment. In this embodiment, four branch holes 42 are located at the ends of the main hole 41, and one end of any branch hole 42 is connected to the main hole 41, while the other end of the branch hole 42 is connected to the outside, thus forming a lubrication channel. This ensures that lubricating oil can flow from the main hole 41 to the branch holes 42, and then from the branch holes 42 to the surface of the single-sided anti-loosening screw, ensuring that the surface of the screw 2 is coated with lubricating oil. This fills the gap between the screw and the corresponding threaded hole, reduces the wear of the threads on the screw, and improves the tightening force and anti-loosening performance of the screw.

[0032] Furthermore, the included angle α formed between any two adjacent dividing holes 42 is the same; that is, in this embodiment, the included angle α formed between any two adjacent dividing holes 42 is 90°. The four dividing holes 42 are vertically distributed, allowing them to be evenly distributed on the surface of the screw 2. When the lubricating oil flows from the main hole 41 into the four dividing holes 42, the lubricating oil flows out of the four dividing holes 42 simultaneously, ensuring that the surface of the screw 2 is evenly covered with lubricating oil. This fills the gap between the screw and the corresponding threaded hole, reduces wear on the screw threads, and improves the screw's tightening force and anti-loosening performance.

[0033] It should be noted that the included angle α formed between two adjacent dividing holes 42 may also be different. Depending on the actual use, the dividing holes 42 can be concentrated on lubricating high wear areas to ensure that the lubricating oil can fill the gap between the threads, reduce thread wear, and improve the tightening force and anti-loosening performance of the screw.

[0034] Furthermore, the bottom of the resistant resin layer 222 is in close contact with the second thread 221, and the shape of the resistant resin layer 222 is the same as that of the second thread 221. Since the second thread 221 has the same shape as the first thread 21, the resistant resin layer 222 is coated on the second thread 221 of the recess 22. When a single-sided resistant screw is screwed into the corresponding hole, it can smoothly transition from the first thread 21 to the resistant resin layer 222, and then from the resistant resin layer 222 back to the first thread 21, improving the efficiency of screw tightening.

[0035] Furthermore, the side of the washer 31 away from the screw head 1 extends towards the end of the screw 2 to form multiple wavy connecting portions 311. These wavy connecting portions 311 increase the friction between the washer 31 and the corresponding mounting surface, preventing the washer 31 from rotating when subjected to vibration. This prevents the washer 31 from rotating, thus altering the elastic potential energy of the connecting spring 32 and reducing the spring's reaction force on the screw head 1 or the corresponding mounting surface. This reduces the risk of the washer 31 failing to adhere tightly to the mounting surface, thereby strengthening the friction between the washer 31 and the corresponding mounting surface and reducing the risk of the washer 31 rotating spontaneously after being subjected to vibration.

[0036] Furthermore, the edge of the end of the screw 2 is recessed inward to form a chamfer, which covers the entire circumference of the end edge of the screw 2, forming a continuous and smooth transition surface. When the screw 2 is screwed into the corresponding threaded hole, the chamfer structure guides the screw 2 smoothly into the hole, avoiding scratches on the workpiece surface and reducing the risk of surface scratches. Secondly, the chamfer structure can promptly disperse the stress on the screw 2, reducing the risk of screw 2 breakage and helping to strengthen the structural strength of the screw.

[0037] Furthermore, the gasket 31 is made of either plastic or metal. When the gasket 31 is made of metal, it has high tensile strength and yield strength, and strong fatigue resistance. It is not easily deformed or broken under alternating loads, preventing deformation during use that could scratch the product during locking, thus protecting the product surface and reducing the risk of surface scratches. When the gasket 31 is made of plastic, it has high elasticity, allowing it to absorb vibration energy and reducing the risk of cracking.

[0038] In summary, this invention, by setting a recess and placing a non-loosening resin inside the recess, increases the friction during the tightening process, significantly improving the anti-loosening performance of the threaded connection and preventing the screw from falling out of the corresponding hole during use, thus ensuring the reliability of the connection. Furthermore, this invention incorporates a tensioning mechanism. When a single non-loosening screw is locked onto the corresponding mounting surface, the tensioning mechanism is subjected to pressure from the screw head and the corresponding mounting surface. Simultaneously, the tensioning mechanism exerts a reaction force on the screw head and the corresponding mounting surface, allowing the tensioning mechanism to be steadily opened, thereby strengthening the connection strength of the screw.

[0039] Furthermore, the above provides a detailed description of a single-sided anti-fall screw provided by the embodiments of this utility model. Specific examples have been used in this document to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A single-sided drop-in screw, characterized by, The single-side anti-falling screw comprises a screw head and a screw rod fixedly connected with the screw head; A supporting mechanism is arranged at the bottom of the screw head, the supporting mechanism comprising a gasket inserted on the screw rod and a connecting spring connecting the gasket and the screw head; A first thread and a pit are arranged on the surface of the screw rod, the pit has a second thread same as the screw rod at the bottom, and a height difference is formed between the first thread and the second thread; An anti-falling resin layer is arranged in the pit.

2. The single-sided drop-in screw of claim 1, wherein, The screw head has a corresponding clamping groove, the clamping groove is in the shape of a cross groove, a plum blossom groove or a straight groove.

3. A single-sided drop-in screw as claimed in claim 2, characterized in that The single-side anti-falling screw has a lubricating hole, the lubricating hole is located at the bottom of the clamping groove, and the lubricating hole comprises a main hole and a plurality of branch holes, the plurality of branch holes are in communication with the main hole.

4. The single-sided drop-in screw of claim 3, wherein, The radius of the main hole is R1, and the radius of the branch hole is R2, and the relationship R1>R2 is satisfied.

5. The single-sided drop-in screw of claim 3, wherein, The plurality of branch holes are located at the end of the main hole, and the branch holes are in communication with the main hole and the external environment.

6. The single-sided drop-in screw of claim 3, wherein, The included angle α formed between the adjacent two branch holes is the same.

7. The single-sided drop-in screw of claim 1, wherein, The bottom of the anti-falling resin layer is in close contact with the second thread, and the shape of the anti-falling resin layer is the same as the second thread.

8. The single-sided drop-in screw of claim 1, wherein, The side of the gasket away from the screw head extends to the end of the screw rod to form a plurality of wave-shaped connecting parts.

9. The single-sided drop-in screw of claim 1, wherein, The edge of the end of the screw rod is inwardly recessed to form a chamfer.

10. The single-sided drop-in screw of claim 1, wherein, The material of the gasket is plastic or metal.

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