Spring self-locking structure and wire clamp
By utilizing the self-locking structure of the helical torsion spring, the friction of the self-locking spring, and the guide groove design, the problem of loosening of cable clamp bolts is solved, achieving stable self-locking and simplified processing, thus improving the stability and convenience of cable clamps.
Patent Information
- Application Number
- CN202520174002.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-24
AI Technical Summary
The bolts of existing cable clamps are prone to loosening under high-frequency vibration and grease environments, resulting in unstable connections and complex processing.
The self-locking structure of the spiral torsion spring is adopted. The inner diameter of the self-locking spring is smaller than the mean diameter of the bolt thread, and the self-locking is achieved by friction. Combined with the guide groove and the moving block, it can quickly lock and unlock, simplifying the processing technology.
It achieves stable self-locking of bolts, prevents loosening, simplifies the processing technology, reduces costs, and improves the stability and convenience of cable clamps.
Smart Images
Figure CN223843187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of power tools, and in particular to a spring self-locking structure and a wire clamp. Background Technology
[0002] Cable clamps are iron or aluminum metal accessories that secure wires to conductors. Most of them need to withstand significant tensile forces during operation, and some also need to ensure good electrical contact. Cable clamps are devices used to fix and support cables, minimizing the risk of electrical faults and ensuring the stability and safety of cables under various environmental conditions.
[0003] Existing cable clamps use an anti-slip plate on the clamping head, with anti-reverse teeth on the anti-slip plate. An anti-reverse tooth ring is also present on the bolt's end face, corresponding to the anti-slip plate's anti-reverse tooth ring. A reverse tooth ring is further present on the wire-pressing surface of the anti-slip plate. The bolt's end face and the reverse tooth ring on the wire-pressing surface of the anti-slip plate face face the same direction, preventing the bolt from rotating in the opposite direction relative to the anti-slip plate. This ensures that the bolt will not loosen even after prolonged connection or in environments with high grease levels and high-frequency vibration. While this solution prevents loosening between the bolt, anti-slip plate, and cable, there is a possibility of slight loosening between the three components as a whole and the clamp body. Furthermore, the bolt's end face requires machining reverse tooth rings, and the connection surface between the anti-slip plate and the bolt, as well as the wire-pressing surface, also require machining reverse tooth rings that must be correspondingly engaged, making the process complex. Utility Model Content
[0004] This utility model provides a spring self-locking structure and wire clamp to prevent bolts from loosening and the bolts of the wire clamp from loosening, and the self-locking and unlocking are more convenient.
[0005] In a first aspect, this utility model provides a spring self-locking structure, which includes a bolt and a self-locking spring wound in the bolt thread, the self-locking spring being a helical torsion spring; the lower end of the self-locking spring is fixed to a main body connected to the bolt, and the upper end of the self-locking spring is connected to a movable block that provides variable space for the upper part of the self-locking spring to twist, the movable block being located in a guide groove provided on the outer shell of the main body; the inner diameter of the spring is smaller than the mean diameter of the bolt thread.
[0006] In this design, because the inner diameter of the spring is smaller than the pitch diameter of the bolt thread, screwing the self-locking spring into the bolt thread increases its inner diameter. Relying on the tightening force of the self-locking spring, a large frictional force is generated between the spring and the thread, achieving self-locking. Manually moving the movable block to twist the spring arm within the variable space unlocks the bolt. The self-locking spring deforms, and its inner diameter becomes larger than the pitch diameter of the bolt thread. At this point, rotating the bolt allows for easy rotation. This design uses a movable block for quick self-locking and unlocking of the bolt, making it more convenient and efficient. Since the lower end of the self-locking spring is fixed to the main body, the self-locking spring locks the bolt, preventing relative rotation between the bolt and the main body. This dual locking mechanism of spring self-locking and main body fixation provides better anti-loosening protection for the bolt.
[0007] The pitch diameter refers to the effective diameter between the outer diameter and the root diameter of the bolt's external thread. The variable space refers to the space within which the spring arm can rotate.
[0008] In the improvement to the above solution, one end of the guide groove is a self-locking end, used to limit the upper lever arm of the self-locking spring from continuing to rotate toward the self-locking end of the guide groove. In this solution, due to the limiting effect of the guide groove, the spring can be in a locked state under normal conditions, and the self-locking end, in the opposite direction, provides a variable space, allowing the torsional spring lever arm to be unlocked.
[0009] An improvement to the above solution involves providing a groove on the main body, with the lower end of the self-locking spring wrapping around the corresponding groove to form a self-locking spring fixing part. In this solution, the self-locking spring is fixed by extending and bending the lower end of the self-locking spring around the main body, simplifying the components for fixing the self-locking spring and making processing simpler.
[0010] In the improvement to the above solution, the plane enclosed by the fixing part of the self-locking spring forms an angle with the bottom surface of the self-locking spring, and the angle can be acute or obtuse. This solution improves the stability of the connection and fixation between the self-locking spring and the main body.
[0011] An improvement to the above solution involves incorporating a knurled pin within the groove, with the groove opening diameter smaller than the knurled pin diameter. This solution utilizes the knurled pin's groove to press against the wire diameter of the fixing part, thereby improving the stability of the wire diameter being fixed.
[0012] Secondly, this utility model provides a wire clamp with a spring self-locking structure, which includes a conductive wire clamp body, an insulating outer shell disposed outside the wire clamp body, and the spring self-locking structure as described above.
[0013] The clamp body is provided with at least one pair of stationary clamps and a movable clamp. The movable clamp includes a pressure plate and a bolt rotatably connected to the pressure plate. The bolt passes through the clamp body and is threaded to it. The self-locking spring is wound on the bolt thread. The lower end of the self-locking spring is fixed to the clamp body. The upper end of the self-locking spring is connected to a movable block that provides variable space for the upper part of the self-locking spring to twist. The movable block is located in the guide groove provided on the insulating shell.
[0014] In this design, because the inner diameter of the spring is smaller than the pitch diameter of the bolt thread, screwing the self-locking spring into the bolt thread increases its inner diameter. Relying on the tightening force of the self-locking spring, a large frictional force is generated between the spring and the thread, achieving the purpose of self-locking the bolt. This allows the self-locking moving chuck pressure plate to move up and down, preventing the cable from being loosened by the pressure plates of the stationary and moving chucks. Manually moving the moving block to twist the spring arm unlocks it in the variable space, causing the self-locking spring to deform. The inner diameter of the self-locking spring is now larger than the pitch diameter of the bolt thread. At this point, rotating the bolt allows for easy rotation, moving the moving chuck pressure plate up or down, thereby disassembling or clamping the cable between the stationary chuck and the pressure plate. Furthermore, since the lower end of the self-locking spring is fixed to the clamp body, the self-locking spring locks the bolt, preventing relative rotation between the bolt and the clamp body during prolonged use. This achieves a double-locking effect of spring self-locking and clamp body fixation, providing better bolt anti-loosening performance.
[0015] The improved solution is that the bolt passing through the through hole of the clamp body is divided into a threaded section and a through hole section. The through hole section accommodates the bolt with the self-locking spring wound around it, and the threaded section is threadedly connected to the bolt so that the pressure plate connected to the end of the bolt can move up and down to clamp or disassemble the cable body.
[0016] A groove leading to the end face of the clamp body is provided at the connection between the through hole section and the threaded section to facilitate the winding and fixing of the lower end of the self-locking spring.
[0017] In this design, the self-locking spring can be concealed within the through-hole section of the clamp body, and the insulating outer shell surrounding the clamp body can reduce its volume and cost, thus lowering the overall size of the cable clamp. The groove on the clamp body facilitates the winding and fixing of the lower end of the self-locking spring.
[0018] An improvement to the above solution is that a blind groove is provided on the top surface of the pressure plate for inserting the end face of the bolt; a first groove or a first through hole is provided on both sides of the blind groove, the projection of the first groove or the first through hole is located on the blind groove, and it connects to the side end face of the pressure plate.
[0019] A second groove is provided around the bolt circumference away from the bolt head;
[0020] The diameter of the first groove is smaller than the diameter of the pin. The pin passes through the second groove of the first groove or first through hole and the screw on both sides of the blind groove, and rotates to connect the pressure plate and the bolt.
[0021] In this design, the distance between the pins located on both sides of the blind hole is greater than the diameter of the second groove on the screw but less than the outer diameter of the screw, thus clamping the second groove of the screw, and the bolt is rotatably connected to the pressure plate. Due to the blind groove, pins, and the second groove of the screw, the structure is simple, the processing technology is simple, and the cost is reduced.
[0022] An improvement to the above solution is that a guide rail is integrally set on the main body of the wire clamp, and a slot adapted to the guide rail is set on the moving block, and the slot slides along the guide rail.
[0023] In this design, the integrated guide rail of the clamp body is slidably connected to the slot of the moving block, which reduces the impact of the relative displacement between the outer shell and the clamp body on the torsion of the self-locking spring lever arm and improves the stability of the torsion of the self-locking spring lever arm. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of a spring self-locking structure provided in an embodiment of the present utility model;
[0025] Figure 2 This is a top view of the self-locking spring provided by this utility model.
[0026] Figure 3 This is a schematic diagram of the left side of the self-locking spring provided by this utility model;
[0027] Figure 4 This is a schematic diagram of the knurled pin provided by this utility model;
[0028] Figure 5 This is a schematic diagram of a wire clamp with a spring self-locking structure provided in an embodiment of this utility model;
[0029] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure at point AA;
[0030] Figure 7 This is a schematic diagram of the insulating shell structure of a wire clamp with a spring self-locking structure provided in an embodiment of this utility model;
[0031] Figure 8 This is a schematic diagram of the bolt of a wire clamp with a spring self-locking structure provided in an embodiment of this utility model. Detailed Implementation
[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.
[0035] See Figure 1 This is a schematic diagram of a spring self-locking structure provided in an embodiment of the present invention. The spring self-locking structure 100 includes a bolt 110 and a self-locking spring 120 wound in the bolt thread. The self-locking spring is a helical torsion spring. The lower end of the self-locking spring is fixed to the main body, and the upper end lever arm 121 of the self-locking spring is connected to a moving block 130, which is located in a guide groove 150 that cooperates with it. One end of the guide groove is the self-locking end 122, and the other end of the guide groove is the unlocking end 123. A variable space for the upper part of the spring to twist is provided between the unlocking end and the self-locking end.
[0036] The inner diameter of the self-locking spring is smaller than the mean diameter of the matching thread. When the self-locking spring is screwed into the thread of the matching screw, the inner diameter of the self-locking spring becomes larger. Relying on the tightening force of the self-locking spring, the self-locking spring and the thread generate a large frictional force, thus achieving the purpose of self-locking.
[0037] In this embodiment, the self-locking spring rotates counterclockwise when viewed from above. Under normal conditions, the moving block is located at the self-locking end on the right side of the guide groove, which is used to limit the self-locking spring from continuing to rotate toward the self-locking end of the guide groove. The self-locking end of the guide groove further limits the lever arm of the self-locking spring through the moving block, making the self-locking more secure and stable.
[0038] When the moving block is manually moved toward the unlocking end, the self-locking spring lever arm is torn by the external force of the moving block due to the variable space in the guide groove. The self-locking spring deforms, and the inner diameter of the self-locking spring is larger than the mean diameter of the bolt thread. At this time, the bolt can be easily rotated by turning it.
[0039] A groove is provided on the main body, and the lower end of the self-locking spring wraps around to form a fixing part 124 of the self-locking spring in the corresponding groove of the main body to fix and lock the spring. The plane enclosed by the fixing part of the self-locking spring has an angle with the bottom surface of the self-locking spring. The angle is an acute angle or an obtuse angle to reduce the shaking of the fixing part in the groove.
[0040] Because the spring wire diameter is relatively thin, a knurled pin 140 is placed in the groove. The groove of the knurled pin presses against the wire diameter of the fixing part. Even if the wire diameter of the fixing part shakes, after rolling through the groove 1411 of the knurled pin, the next knurled pin groove continues to press against the wire diameter of the fixing part, improving the stability of the fixing part wire diameter being fixed.
[0041] See Figure 5 This is a schematic diagram of a wire clamp with a spring-loaded self-locking structure according to an embodiment of the present invention. The wire clamp 200 with the spring-loaded self-locking structure includes a metal clamp body 210, an insulating outer shell 220 disposed outside the clamp body, and the spring-loaded self-locking mechanism 100 described in the above embodiment. Two stationary clamps 230 are provided on the clamp body, and movable clamps are respectively disposed corresponding to the stationary clamps. The stationary and movable clamps hold the cable body 300.
[0042] The movable clamp includes a pressure plate 241 and a bolt 110 rotatably connected to the pressure plate. The bolt passes through a through hole provided on the clamp body. The through hole is divided into a threaded section 211 and a through-hole section 212. The through-hole section accommodates the bolt on which the self-locking spring is wound. The threaded section is threadedly connected to the bolt, so that the pressure plate connected to the end of the bolt can move up and down to clamp or remove the cable from the stationary clamp. A groove 213 leading to the end face of the clamp body is provided at the connection between the through-hole section and the threaded section to facilitate the lower end of the self-locking spring being wound and fixed.
[0043] A guide rail 214 is integrally mounted on the main body of the clamp. A slot 131 adapted to the guide rail is provided on the movable block 130 of the spring self-locking structure. The slot 131 slides along the guide rail 214, changing the unlocking or locking state of the movable block. A protrusion 132 for connecting the lever arm of the self-locking spring is provided above the slot. An insulating shell is provided outside the main body of the clamp, with a guide groove 221 on the shell. The movable block 130 passes through the guide groove 221, which limits the self-locking end 222 of the movable block and provides variable space for the upper part of the self-locking spring to twist and unlock. The other end of the guide groove 221 is the unlocking end 223. The movable block has an insulating structure.
[0044] The fixing part of the spring self-locking structure is wound inside the groove 213 of the wire clamp body. The groove, in conjunction with the knurled pin 140, presses down the lower end of the spring wire diameter, reducing the shaking of the fixing part in the groove.
[0045] The moving block acts on the self-locking spring to lock or unlock the bolt. See the working principle of the spring self-locking mechanism, which will not be repeated here.
[0046] A blind groove 2411 is provided on the top surface of the pressure plate, into which the end face of the bolt 110 is inserted. A second groove, preferably a circumferential arc-shaped groove 111 smaller than the inner diameter of the bolt thread, is provided on the bolt shank away from the bolt head. Two first grooves 2412 or first through holes are provided on the pressure plates on both sides of the blind groove. The projections of the two grooves or first through holes are located on the blind groove and connect to the side end face of the pressure plate. The groove opening diameter is smaller than the diameter of the knurled pin. When the knurled pin 141 is inserted from the two first grooves 2412 or first through holes on the side end face of the pressure plate, it also passes through the circumferential arc-shaped groove 111 of the bolt, thereby rotating and connecting the bolt and the pressure plate. Tightening the bolt upwards or downwards causes the pressure plate to disassemble or clamp the cable body.
[0047] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A spring self-locking structure, characterized in that, It includes a bolt and a self-locking spring wound in the bolt thread. The self-locking spring is a helical torsion spring. The lower end of the self-locking spring is fixed to the main body connected to the bolt. The upper end of the self-locking spring is connected to a movable block that provides variable space for the upper part of the self-locking spring to twist. The movable block is located in a guide groove provided on the outer shell of the main body. The inner diameter of the spring is smaller than the mean diameter of the bolt thread.
2. The spring self-locking structure as described in claim 1, characterized in that, One end of the guide groove is a self-locking end, which is used to limit the upper lever arm of the self-locking spring from continuing to rotate toward the self-locking end of the guide groove.
3. The spring self-locking structure as described in claim 1, characterized in that, A groove is provided on the main body, and the lower end of the self-locking spring is wrapped around to form a self-locking spring fixing part in the corresponding groove of the main body.
4. The spring self-locking structure as described in claim 3, characterized in that, The plane enclosed by the fixing part of the self-locking spring has an angle with the bottom surface of the self-locking spring, and the angle is acute or obtuse.
5. The spring self-locking structure as described in claim 3, characterized in that, A knurled pin is installed in the groove, and the diameter of the groove opening is smaller than the diameter of the knurled pin.
6. A wire clamp with a spring-loaded self-locking structure, comprising a conductive wire clamp body, an insulating outer shell disposed outside the wire clamp body, and a spring-loaded self-locking structure as described in any one of claims 1-5; characterized in that, The clamp body is provided with at least one pair of stationary clamps and a movable clamp. The movable clamp includes a pressure plate and a bolt rotatably connected to the pressure plate. The bolt passes through the clamp body and is threaded to it. The self-locking spring is wound on the bolt thread. The lower end of the self-locking spring is fixed to the clamp body. The upper end of the self-locking spring is connected to a movable block that provides variable space for the upper part of the self-locking spring to twist. The movable block is located in the guide groove provided on the insulating shell.
7. The wire clamp with spring-loaded self-locking structure as described in claim 6, characterized in that, The bolt passes through the through hole of the clamp body, which is divided into a threaded section and a through hole section. The through hole section accommodates the bolt with the self-locking spring wound around it, and the threaded section is threadedly connected to the bolt so that the pressure plate connected to the end of the bolt can move up and down to clamp or remove the cable body. A groove leading to the end face of the clamp body is provided at the connection between the through hole section and the threaded section to facilitate the winding and fixing of the lower end of the self-locking spring.
8. The wire clamp with a spring-loaded self-locking structure as described in claim 6, characterized in that, A blind groove is provided on the top surface of the pressure plate for inserting the end face of the bolt; a first groove or a first through hole is provided on both sides of the blind groove, the projection of the first groove or the first through hole is located on the blind groove and connects to the side end face of the pressure plate; A second groove is provided around the bolt circumference away from the bolt head; The diameter of the first groove is smaller than the diameter of the pin. The pin passes through the second groove of the first groove or first through hole and the screw on both sides of the blind groove, and rotates to connect the pressure plate and the bolt.
9. The wire clamp with a spring-loaded self-locking structure as described in claim 6, characterized in that, The main body of the wire clamp is integrally provided with a guide rail, and the moving block is provided with a slot that matches the guide rail, and the slot slides along the guide rail.