An expansion bolt that is easy to adjust

Abstract

The utility model discloses a kind of expansion bolts of being convenient for adjusting, including expansion pipe;Bolt, it includes stem and threaded portion;Butterfly nut, it is used to cooperate with the threaded portion;Limiting sleeve, it includes the upper tube body and lower tube body for the bolt insertion and integrally connected, be equipped with on the upper tube body end portion on the pipe part of shrinkage, and be equipped with on the lower tube body end portion on the sawtooth part;When the bolt is unscrewed, the limiting sleeve is rotated with the bolt synchronously, to make the limiting sleeve move to press on the top surface of keel, and with the butterfly nut is clamped on the top surface and bottom surface of keel together.The utility model provides a kind of expansion bolts of being convenient for adjusting, when bolt is unscrewed, limiting sleeve can rotate with bolt synchronously and move up, can quickly adapt to keel of different thickness, or to keel, adjust the levelness of keel, finally and through the cooperation of butterfly nut, realize the convenient, reliable clamping of keel, greatly improve installation efficiency and adjust convenience.

Description

Technical Field

[0001] This utility model relates to the field of audio equipment technology, and in particular to an easily adjustable expansion bolt. Background Technology

[0002] In the field of architectural decoration, expansion bolts are commonly used to fix ceiling joists, brackets, and other components to the concrete ceiling slab, primarily for their supporting function. However, this allows the ceiling joists to move upwards freely. Therefore, a solution was later developed that adds nuts to the bolts to clamp the ceiling joists vertically for fixation. However, the nuts are located above the ceiling joists, making adjustment inconvenient, and they are prone to loosening, resulting in insufficient reliability. Utility Model Content

[0003] To solve the above problems, this technical solution provides an expansion bolt that is easy to adjust.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] An easily adjustable expansion bolt, including

[0006] Expansion tube;

[0007] A bolt, which includes a shank and a threaded portion;

[0008] A wing nut, which is used to mate with the threaded portion;

[0009] The limiting sleeve includes an upper tube body and a lower tube body integrally connected for the insertion of the bolt, a constricted tube portion provided on the end of the upper tube body, and a serrated portion provided on the end of the lower tube body.

[0010] When the bolt is screwed into the expansion tube, the serrated part presses against the expansion tube to restrict the limiting sleeve from rotating synchronously with the threaded part, so that the threaded part taps the shrinking tube part when it rotates; when the bolt is screwed out, the limiting sleeve rotates synchronously with the bolt, so that the limiting sleeve moves to press against the top surface of the keel, and is clamped together with the wing nut on the top and bottom surfaces of the keel.

[0011] As described above, an easily adjustable expansion bolt has a deformation structure on the limiting sleeve. The threaded portion taps the shrinking tube portion, pressing the limiting sleeve between the expansion tube and the bolt. When the upper tube and the lower tube are pressed against each other, the deformation structure is used to deform the limiting sleeve into a flattened shape, increasing the maximum outer diameter of the limiting sleeve to restrict the limiting sleeve from passing through the keel.

[0012] As described above, an easily adjustable expansion bolt includes an annular groove disposed between the upper and lower tubes and arranged circumferentially thereon.

[0013] As described above, an easily adjustable expansion bolt has a V-shaped cross-section in the annular groove.

[0014] As described above, an easily adjustable expansion bolt has a deformable structure including a vertical groove that is arranged along the axial direction of the limiting sleeve and penetrates its sidewall to connect its inner cavity with the outside.

[0015] As described above, an easily adjustable expansion bolt has multiple vertical grooves spaced apart circumferentially along the limiting sleeve.

[0016] As described above, in an easily adjustable expansion bolt, the inner diameter of the shrinking section is smaller than the inner diameter of the upper tube.

[0017] The beneficial effects of this application are:

[0018] This utility model provides an easily adjustable expansion bolt. A limiting sleeve is fitted onto the bolt. When the bolt is screwed in, the limiting sleeve can be quickly and firmly fixed onto the bolt through the anti-rotation of the serrated part and the tapping of the thread. When the bolt is unscrewed, the limiting sleeve can rotate synchronously with the bolt and move upward. It can quickly adapt to keels of different thicknesses or press down on the keel to adjust its levelness. Finally, through the cooperation with the wing nut, it achieves convenient and reliable clamping of the keel, greatly improving installation efficiency and adjustment convenience. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the state before the limiting sleeve is flattened;

[0021] Figure 2 This is a schematic diagram of the state after the limiting sleeve is flattened. Detailed Implementation

[0022] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] An easily adjustable expansion bolt, including

[0024] Expansion tube 1;

[0025] Bolt 2, which includes a shank 21 and a threaded portion 22;

[0026] A wing nut 3, which is used to mate with the threaded portion 22;

[0027] The limiting sleeve 4 includes an upper tube 41 and a lower tube 42 integrally connected for the insertion of the bolt 2, a constricted tube portion 43 provided on the end of the upper tube 41, and a serrated portion 44 provided on the end of the lower tube 42.

[0028] When the bolt 2 is screwed into the expansion tube 1, the serrated part 44 presses against the expansion tube 1 to restrict the limiting sleeve 4 from rotating synchronously with the threaded part 22, so that the threaded part 22 taps the shrinking part 43 when it rotates; when the bolt 2 is screwed out, the limiting sleeve 4 rotates synchronously with the bolt 2, so that the limiting sleeve 4 moves to press against the top surface of the keel, and is clamped together with the wing nut 3 on the top and bottom surfaces of the keel.

[0029] This utility model provides an easily adjustable expansion bolt. A limiting sleeve is fitted onto the bolt. When the bolt is screwed in, the limiting sleeve can be quickly and firmly fixed onto the bolt through the anti-rotation of the serrated part and the tapping of the thread. When the bolt is unscrewed, the limiting sleeve can rotate synchronously with the bolt and move upward. It can quickly adapt to keels of different thicknesses or press down on the keel to adjust its levelness. Finally, through the cooperation with the wing nut, it achieves convenient and reliable clamping of the keel, greatly improving installation efficiency and adjustment convenience.

[0030] Furthermore, as a preferred embodiment of this solution and not a limitation, the limiting sleeve 4 is provided with a deformation structure 5. The threaded portion 22 taps the shrinking portion 43, pressing the limiting sleeve 4 between the expansion tube 1 and the bolt 2. When the upper tube 41 and the lower tube 42 are pressed against each other, the deformation structure 5 is used to deform the limiting sleeve 4 into a flattened shape, increasing the maximum outer diameter of the limiting sleeve 4 to prevent it from passing through the keel. By setting the deformation structure, the limiting sleeve can undergo controllable radial expansion during the tightening process. This effect directly prevents the limiting sleeve from passing through the mounting hole on the keel during subsequent keel installation, thereby ensuring that the limiting sleeve can effectively press against the top surface of the keel and form a stable clamp with the wing nut.

[0031] Furthermore, as a preferred embodiment of this solution and not a limitation, the deformable structure 5 includes an annular groove 51 disposed between the upper tube 41 and the lower tube 42 and arranged circumferentially thereon. The annular groove structure forms a clear weak point or hinge point in the circumferential direction, which can effectively guide and concentrate stress, ensuring that the limiting sleeve preferentially and regularly bends and deforms at the annular groove when subjected to axial compression, thereby reliably achieving the effect of radial expansion (flattening). The structure is simple and the deformation is controllable.

[0032] Furthermore, as a preferred embodiment of this solution and not a limitation, the cross-section of the annular groove 51 is V-shaped. The V-groove design has a sharp corner effect, which can further concentrate stress, making it easier for the limiting sleeve to start and complete bending deformation at the bottom of the V-groove when compressed, reducing the axial force required for deformation, and making the deformation process more labor-saving and rapid.

[0033] Furthermore, as a preferred embodiment of this solution and not a limitation, the deformable structure 5 includes a vertical groove 52 disposed along the axial direction of the limiting sleeve 4 and penetrating its sidewall to connect its inner cavity with the outside. The vertical groove structure weakens the local stiffness of the limiting sleeve sidewall, and when subjected to axial compression, the limiting sleeve can more easily open to both sides along the vertical groove, thereby achieving radial expansion. This structure can also effectively increase the outer diameter to prevent it from passing through the keel hole.

[0034] Furthermore, as a preferred embodiment of this solution and not a limitation, the plurality of vertical grooves 52 are distributed at intervals along the circumference of the limiting sleeve 4. The uniform circumferential distribution of the plurality of vertical grooves ensures that the limiting sleeve is subjected to uniform circumferential force during deformation, resulting in a more regular and symmetrical expansion shape. This avoids jamming or instability problems that may be caused by single-point deformation, thereby improving the stability and reliability of clamping.

[0035] Furthermore, as a preferred embodiment of this solution and not a limitation, the inner diameter of the constricted tube portion 43 is smaller than the inner diameter of the upper tube body 41. The constricted tube portion forms a step on its inner diameter. This stepped structure interacts with the threaded portion of the bolt, ensuring that the thread can effectively "bite" into the wall of the constricted tube portion when the bolt is screwed in, thereby smoothly achieving the tapping process. This is a key structural guarantee for achieving the anti-rotation of the limiting sleeve and the threaded connection with the bolt.

[0036] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. An easily adjustable expansion bolt, characterized in that: include Expansion tube (1); Bolt (2), which includes a shank (21) and a threaded portion (22); A wing nut (3) is used to mate with the threaded portion (22); The limiting sleeve (4) includes an upper tube body (41) and a lower tube body (42) for the bolt (2) to be inserted and integrally connected, a tube shrinking part (43) provided on the end of the upper tube body (41), and a serrated part (44) provided on the end of the lower tube body (42). When the bolt (2) is screwed into the expansion tube (1), the serrated part (44) presses against the expansion tube (1) to restrict the limiting sleeve (4) and the threaded part (22) from rotating synchronously, so that the threaded part (22) taps the shrinking part (43) when it rotates; when the bolt (2) is screwed out, the limiting sleeve (4) rotates synchronously with the bolt (2), so that the limiting sleeve (4) moves to press against the top surface of the keel and is clamped together with the butterfly nut (3) on the top and bottom surfaces of the keel.

2. The easily adjustable expansion bolt according to claim 1, characterized in that: The limiting sleeve (4) is provided with a deformation structure (5). The threaded part (22) taps the shrinking part (43) and squeezes the limiting sleeve (4) between the expansion tube (1) and the bolt (2). When the upper tube body (41) and the lower tube body (42) are squeezed against each other, the deformation structure (5) is used to deform the limiting sleeve (4) into a flattened shape, so that the maximum outer diameter of the limiting sleeve (4) increases, thereby restricting the limiting sleeve (4) from passing through the keel.

3. The easily adjustable expansion bolt according to claim 2, characterized in that: The deformable structure (5) includes an annular groove (51) disposed between the upper tube (41) and the lower tube (42) and arranged circumferentially thereon.

4. The easily adjustable expansion bolt according to claim 3, characterized in that: The cross-section of the annular groove (51) is V-shaped.

5. An easily adjustable expansion bolt according to claim 2, characterized in that: The deformable structure (5) includes a vertical groove (52) that is arranged along the axis of the limiting sleeve (4) and penetrates its sidewall to connect its inner cavity with the outside.

6. The easily adjustable expansion bolt according to claim 5, characterized in that: The multiple vertical grooves (52) are distributed circumferentially along the limiting sleeve (4).

7. The easily adjustable expansion bolt according to claim 1, characterized in that: The inner diameter of the constricted section (43) is smaller than the inner diameter of the upper tube (41).

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