Double nut nested adjusting screw

Abstract

This utility model relates to the field of fastener technology and discloses a double-nut nested adjusting screw, including a screw rod with a first thread and a second thread on its surface. The screw rod is externally threaded with a first nut and a second nut. A first connecting ring is fixedly connected to the bottom of the second nut. A second connecting ring is provided within the inner diameter of the first connecting ring. Multiple guide rods and two connecting rods are fixedly connected to the outer diameter of the second connecting ring. A first retaining tooth is fixedly connected to the bottom of the second connecting ring, and a spring is fixedly connected to the top of the first retaining tooth. In this utility model, the reverse thread and matching retaining tooth structure on the screw rod achieve an anti-loosening function. When vibration occurs, the reverse rotation tendency is counteracted by the engagement of the retaining tooth, thus maintaining a tightened state. During disassembly or adjustment, the retaining tooth can be retracted by moving the connecting rod, releasing the engagement restriction. This solves the problem of loosening and inconvenient adjustment due to vibration when using double nuts.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a double-nut nested adjusting screw. Background Technology

[0002] The double-nut nested adjusting screw is a mechanical structure that combines precise adjustment and anti-loosening locking functions. It is widely used in scenarios that require stable fixation and flexible adjustment of position or length. It typically consists of a screw, an adjusting nut, and a locking nut.

[0003] The existing double-nut nested adjusting screw solves the problem of single nut loosening due to vibration by pressing the two nuts together, and is especially suitable for high-frequency vibration environments. However, under long-term high-frequency strong vibration, the friction between the two nuts may gradually decrease, leading to slow loosening. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a double-nut nested adjustment screw, which aims to improve the problem that double nuts may loosen due to vibration during use and make adjustment troublesome.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-nut nested adjusting screw, comprising a screw rod, the surface of which is provided with a first thread and a second thread, the screw rod is externally threaded to a first nut and a second nut, the bottom of the second nut is fixedly connected to a first connecting ring, the inner diameter of the first connecting ring is provided with a second connecting ring, the outer diameter of the second connecting ring is fixedly connected to a plurality of guide rods and two connecting rods, the bottom of the second connecting ring is fixedly connected to a first retaining tooth, the top of the first retaining tooth is fixedly connected to a spring, the top of the first nut is fixedly connected to a second retaining tooth, and the bottom of the first nut is provided with an adjusting component.

[0006] Preferably, the adjusting component includes a connecting ring, which is fixedly connected to a first nut. The outer surface of the first nut is marked. A connector is rotatably connected to the bottom of the connecting ring and the first nut. The top of the connector has evenly distributed grooves. Four connecting blocks are fixedly connected to the inner diameter of the connector. Four slide rails are vertically provided on the surface of the screw.

[0007] Preferably, the first thread and the second thread have opposite helical directions, and the first thread and the second thread have the same helical pitch.

[0008] Preferably, the inner wall of the first nut is in close contact with the second thread and the screw, and the inner wall of the second nut is in close contact with the first thread and the screw.

[0009] Preferably, the second locking tooth engages with the first locking tooth, and the inner diameter of the second locking tooth and the first locking tooth is larger than the outer diameter of the screw.

[0010] Preferably, the spring is fixedly connected to the bottom of the second nut, and the bottoms of the first retaining tooth, the connecting rod, and the first connecting ring are all flush.

[0011] Preferably, the connecting rod passes through the connecting groove, and the guide rod is slidably connected to the guide groove.

[0012] Preferably, the four slide rails are located at positions corresponding to four connecting blocks, and the connecting blocks are slidably connected to the slide rails.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, the anti-loosening function is achieved by the reverse thread and matching retaining tooth structure set on the screw. When vibration occurs, the reverse rotation tendency will be offset by the engagement of the retaining teeth, thereby maintaining the tightened state. When disassembling or adjusting, the retaining teeth can be retracted by moving the connecting rod to release the engagement restriction, which solves the problem of loosening and troublesome adjustment due to vibration when using double nuts.

[0015] 2. In this utility model, an adjustment component is set at the bottom of the first nut, and precise adjustment is achieved through the cooperation of the marking and the engraving. During adjustment, the operator can observe the marking at the edge of the nut pointing to the engraving on the top of the connector to determine the number of rotations and the movement dimension of the nut. This is suitable for scenarios where installation accuracy is required, and solves the problem of not being able to make precise adjustments when adjusting the nut engagement. Attached Figure Description

[0016] Figure 1 This is a perspective view of a double-nut nested adjusting screw proposed in this utility model;

[0017] Figure 2 This is a partial schematic diagram of the second nut of a double-nut nested adjusting screw proposed in this utility model;

[0018] Figure 3 This is a partial schematic diagram of the first connecting ring of a double-nut nested adjusting screw proposed in this utility model;

[0019] Figure 4 This is a partial schematic diagram of the first nut of a double-nut nested adjusting screw proposed in this utility model;

[0020] Figure 5 This is a partial schematic diagram of a connector for a double-nut nested adjusting screw proposed in this utility model.

[0021] Legend:

[0022] 1. Screw; 2. First thread; 3. Second thread; 4. First nut; 5. Second nut; 6. First connecting ring; 7. Second connecting ring; 8. First retaining tooth; 9. Guide rod; 10. Connecting rod; 11. Spring; 12. Connecting groove; 13. Guide groove; 14. Second retaining tooth; 15. Connecting piece; 16. Mark; 17. Score; 18. Connecting ring; 19. Connecting block; 20. Slide rail. Detailed Implementation

[0023] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Reference Figures 1-3 This utility model provides an embodiment of a double-nut nested adjusting screw, including a screw rod 1. The screw rod 1 has a first thread 2 and a second thread 3 on its surface. The screw rod 1 is externally threaded with a first nut 4 and a second nut 5. The bottom of the second nut 5 is fixedly connected to a first connecting ring 6. The inner diameter of the first connecting ring 6 is provided with a second connecting ring 7. The outer diameter of the second connecting ring 7 is fixedly connected to a plurality of guide rods 9 and two connecting rods 10. The bottom of the second connecting ring 7 is fixedly connected to a first retaining tooth 8. The top of the first retaining tooth 8 is fixedly connected to a spring 11. The top of the first nut 4 is fixedly connected to a second retaining tooth 14. The bottom of the first nut 4 is provided with an adjusting component.

[0025] Specifically, by setting opposite first threads 2 and second threads 3 on the screw 1, the first nut 4 needs to be turned to the right when screwed upwards, while the second nut 5 needs to be turned to the left when screwed upwards. However, a second retaining tooth 14 and a first retaining tooth 8 are respectively set on opposite sides of the two nuts. When the first nut 4 and the second nut 5 rotate due to vibration after being tightened, one rotates to the left and the other to the right. Due to the engagement between the second retaining tooth 14 and the first retaining tooth 8, the forces are counteracted, maintaining the tightening effect of the second retaining tooth 14 and the first retaining tooth 8 on the screw 1. When it is necessary to disassemble or adjust the first nut 4 and the second nut 5... When adjusting, by moving the connecting rod 10, the connecting rod 10 is engaged at the top of the connecting groove 12, thereby causing the second connecting ring 7 and the first retaining tooth 8 to move upward and be stored in the inner wall of the first connecting ring 6. As a result, the first nut 4 and the second nut 5 lose their engagement. First, unscrew or loosen the second nut 5 from the screw 1, and then unscrew or adjust the first nut 4. After adjustment, release the connecting rod 10 from the engagement of the connecting groove 12. The first retaining tooth 8 and the second connecting ring 7, under the pop-out of the spring 11, re-engage the second retaining tooth 14, which solves the problem of the double nuts becoming loose and difficult to adjust due to vibration during use.

[0026] Reference Figures 4-5 The adjusting assembly includes a connecting ring 18, which is fixedly connected to a first nut 4. The outer surface of the first nut 4 is marked with a mark 16. The bottom of the connecting ring 18 and the first nut 4 is rotatably connected to a connector 15. The top of the connector 15 is provided with evenly distributed grooves 17. The inner diameter of the connector 15 is fixedly connected to four connecting blocks 19. The surface of the screw 1 is provided with four slide rails 20 in the vertical direction.

[0027] When adjusting the first nut 4, the markings 16 at the corners of the first nut 4 and the multiple grooves 17 on the top of the connector 15 allow the operator to determine the precise size of the first nut 4's movement by observing the number of rotations and the grooves 17 that the markings 16 point to when rotating. Furthermore, when the first nut 4 rotates, the connector 15's angle remains fixed due to its connection to the slide rail 20 on the screw 1 via the connecting block 19 within its inner diameter. The movement of the first nut 4 allows for vertical movement on the screw 1, thus solving the problem of inaccurate adjustment when adjusting the nut engagement.

[0028] Reference Figure 1 The first thread 2 and the second thread 3 have opposite helical directions, and the first thread 2 and the second thread 3 have the same pitch.

[0029] Specifically, the screw 1 has two threads with the same pitch but opposite directions on its surface. When used with nuts of different threads, the nuts can be screwed into the screw 1 either left-handed or right-handed.

[0030] Reference Figure 1 The inner wall of the first nut 4 is tightly fitted with the second thread 3 and the screw 1, and the inner wall of the second nut 5 is tightly fitted with the first thread 2 and the screw 1.

[0031] Specifically, the first nut 4 located at the bottom needs to be turned clockwise to unscrew the screw 1, while the second nut 5 needs to be turned counterclockwise.

[0032] Reference Figures 2-3 The second locking tooth 14 engages with the first locking tooth 8, and the inner diameters of the second locking tooth 14 and the first locking tooth 8 are larger than the outer diameter of the screw 1.

[0033] Specifically, the second locking tooth 14 and the first locking tooth 8 are opposite each other. When the screw 1 vibrates, the second thread 3 and the first nut 4 vibrate slightly. However, the slight vibration movement cannot make the two locking teeth cross each other. When the first locking tooth 8 is engaged with the second locking tooth 14, the first locking tooth 8 cannot rotate due to the limit of the guide rod 9 in the guide groove 13. Since the first connecting ring 6 abuts against the top of the first nut 4, the first locking tooth 8 will not be pushed upward by the first nut 4.

[0034] Reference Figure 3 The spring 11 is fixedly connected to the bottom of the second nut 5, and the bottoms of the first retaining tooth 8, the connecting rod 10 and the first connecting ring 6 are all flush.

[0035] Specifically, the first locking tooth 8 can only move by driving the connecting rod 10. When the first locking tooth 8 is pushed back to the bottom by the spring 11, the first connecting ring 6 and the top of the first nut 4 are tightly fitted together, so that the first locking tooth 8 will not be pushed up when the first nut 4 vibrates and moves.

[0036] Reference Figure 3 The connecting rod 10 passes through the connecting groove 12, and the guide rod 9 is slidably connected to the guide groove 13.

[0037] Specifically, the length of the connecting rod 10 is longer than that of the guide rod 9, so that the connecting rod 10 can pass through the first connecting ring 6, allowing the outer diameter of the first connecting ring 6 to move the connecting rod 10, while the guide rod 9 is engaged in the first connecting ring 6 and moves on the guide groove 13.

[0038] Reference Figure 5 The four slide rails 20 are located at positions corresponding to the four connecting blocks 19, and the connecting blocks 19 and the slide rails 20 are slidably connected.

[0039] Specifically, when the first nut 4 rotates and moves up and down, it drives the connecting piece 15 to move simultaneously. Due to the connection between the connecting block 19 and the slide rail 20, the connecting piece 15 is restricted from rotating and can only move up and down.

[0040] Working principle: Due to the opposite rotation directions of the first thread 2 and the second thread 3 on screw 1, the first nut 4 and the second nut 5 exhibit opposite rotational tendencies when tightened. The inner wall of the first nut 4 engages with the second thread 3, requiring a right-hand turn to tighten upwards; the inner wall of the second nut 5 engages with the first thread 2, requiring a left-hand turn to tighten upwards. Second retaining teeth 14 and first retaining teeth 8 are respectively provided on opposite sides of the two nuts. When tightened, the retaining teeth mesh with each other. If vibration causes the nuts to loosen, the right-hand rotation tendency of the first nut 4 and the second nut 5 will... The leftward rotation tendency is counteracted by the meshing resistance between the teeth. When disassembling or adjusting, move the connecting rod 10 to make it snap into the top of the connecting groove 12, which will drive the second connecting ring 7 and the first tooth 8 to move upward against the elastic force of the spring 11 and be stored in the first connecting ring 6, thus releasing the tooth engagement. At this time, the nut can be operated independently. After the operation is completed, release the connecting rod 10, and the spring 11 will push the first tooth 8 to reset and re-engage with the second tooth 14, restoring the anti-loosening function. This process does not require additional tools and achieves automatic anti-loosening through mechanical structure.

[0041] The angle is fixed by the sliding fit between the connector 15 and the screw 1. The four connecting blocks 19 on the inner diameter of the connector 15 are slidably connected to the four slide rails 20 on the surface of the screw 1, which restricts the rotation of the connector 15. When the first nut 4 is rotated, the connector 15 at its bottom can only move up and down along the slide rail 20. The mark 16 on the outer surface of the first nut 4 and the engraving 17 on the top of the connector 15 form an indicator system. By observing the position change of the mark 16 pointing to the engraving 17, and combining it with the number of rotations of the nut, the operator can quantify the movement distance of the first nut 4, thereby converting the rotational motion of the nut into a quantifiable linear displacement indication, which improves the controllability of the adjustment process.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 double-nut nested adjusting screw, comprising a screw rod (1), characterized in that: The screw (1) has a first thread (2) and a second thread (3) on its surface. The screw (1) is connected to a first nut (4) and a second nut (5) on its external thread. The bottom of the second nut (5) is fixedly connected to a first connecting ring (6). The inner diameter of the first connecting ring (6) is provided with a second connecting ring (7). The outer diameter of the second connecting ring (7) is fixedly connected to multiple guide rods (9) and two connecting rods (10). The bottom of the second connecting ring (7) is fixedly connected to a first locking tooth (8). The top of the first locking tooth (8) is fixedly connected to a spring (11). The top of the first nut (4) is fixedly connected to a second locking tooth (14). The bottom of the first nut (4) is provided with an adjustment component.

2. The double-nut nested adjusting screw according to claim 1, characterized in that: The adjustment assembly includes a connecting ring (18), which is fixedly connected to a first nut (4). The outer surface of the first nut (4) is marked (16). The bottom of the connecting ring (18) and the first nut (4) is rotatably connected to a connector (15). The top of the connector (15) is provided with evenly distributed grooves (17). The inner diameter of the connector (15) is fixedly connected to four connecting blocks (19). The surface of the screw (1) is provided with four slide rails (20) in the vertical direction.

3. The double-nut nested adjusting screw according to claim 1, characterized in that: The first thread (2) and the second thread (3) have opposite helical directions, and the first thread (2) and the second thread (3) have the same pitch.

4. The double-nut nested adjusting screw according to claim 1, characterized in that: The inner wall of the first nut (4) is tightly fitted with the second thread (3) and the screw (1), and the inner wall of the second nut (5) is tightly fitted with the first thread (2) and the screw (1).

5. A double-nut nested adjusting screw according to claim 1, characterized in that: The second locking tooth (14) engages with the first locking tooth (8), and the inner diameter of the second locking tooth (14) and the first locking tooth (8) is greater than the outer diameter of the screw (1).

6. A double-nut nested adjusting screw according to claim 1, characterized in that: The spring (11) is fixedly connected to the bottom of the second nut (5), and the bottoms of the first locking tooth (8), the connecting rod (10) and the first connecting ring (6) are all flush.

7. A double-nut nested adjusting screw according to claim 1, characterized in that: The connecting rod (10) passes through the connecting groove (12), and the guide rod (9) is slidably connected to the guide groove (13).

8. A double-nut nested adjusting screw according to claim 2, characterized in that: The four slide rails (20) are located at positions corresponding to the four connecting blocks (19), and the connecting blocks (19) are slidably connected to the slide rails (20).

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