Expansion anti-loosening bolt and anti-loosening fixing assembly

Abstract

The utility model relates to an expansion lock bolt and a lock fixing assembly. A limiting part protruding in the radial direction is fixed to one side of the first end of a screw rod. The elastic piece, the sleeve and the nut sequentially sleeve the screw rod from one side of the limiting part to the direction of the second end; the elastic sheet and the sleeve can axially move relative to the screw rod, and the nut is in threaded connection with the screw rod; the elastic pieces extend towards the direction of the second end of the screw rod and meanwhile warp outwards in the radial direction, and the end, close to the elastic pieces, of the sleeve is provided with an inclined face matched with the inclined direction of the elastic pieces. Compared with a traditional expansion bolt, the expansion bolt is more suitable for being used for fixing a soft foundation. In the use process, in the first step, the limiting part is pulled through the screw rod, the movable sleeve and the elastic piece are pulled outwards, the elastic piece is pressed outwards in the radial direction to the pipe hole wall in cooperation with the movable sleeve, and the elastic piece extrudes the hole wall outwards to form a fixed point for locking. The bolt assembly is suitable for a softer foundation body, is stable and firm, and is not easy to loosen like a traditional expansion bolt.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical parts, and in particular to an expansion anti-loosening bolt and an anti-loosening fixing assembly. Background Art

[0002] Bolt assemblies are known as the "glue" between mechanical parts and are commonly used to secure workpieces. Expansion bolts, on the other hand, are specialized threaded connectors used to secure pipe supports, hangers, brackets, or equipment to walls, floors, or columns. Existing expansion bolts consist of a countersunk bolt, an expansion tube, a flat washer, a spring washer, and a hexagonal nut. To use them, first drill a hole of the appropriate size in the mounting element. Then, insert the bolt and expansion tube into the hole. Tighten the nut to tighten the bolt, expansion tube, mounting component, and mounting element into a single unit.

[0003] However, existing expansion bolts are generally suitable for relatively hard foundations such as walls. For relatively soft foundations, such as relatively soft wood, they are still prone to loosening due to the easy deformation and expansion of the holes, resulting in the bolts not being firmly fixed, greatly affecting the fixing effect, and even causing the problem of parts falling off. Summary of the Invention

[0004] Based on this, it is necessary to provide an expansion anti-loosening bolt and an anti-loosening fixing assembly to address the problem that existing expansion bolts are not firmly fixed to soft foundation bodies.

[0005] On the one hand, the present invention proposes an expansion anti-loosening bolt, comprising a screw rod, a radially protruding limiting portion fixed to one side of the first end of the screw rod; and also comprising a spring piece, a sleeve and a nut sequentially sleeved on the screw rod from one side of the limiting portion toward the second end; the spring piece and the sleeve can both move axially relative to the screw rod, and the nut is threadedly connected to the screw rod; the spring piece extends toward the second end of the screw rod while radially tilting outward, and the end of the sleeve close to the spring piece is provided with an inclined surface adapted to the inclination direction of the spring piece.

[0006] Furthermore, the number of the spring pieces and the number of the sleeves are both two, including a first spring piece, a first sleeve, a second spring piece and a second sleeve.

[0007] Furthermore, when the screw moves out of the hole: the limiting portion pushes the first spring piece to displace, and the first spring piece abuts against the inclined surface of the first sleeve and then opens radially; the first sleeve pushes the second spring piece to displace, and the second spring piece abuts against the inclined surface of the second sleeve and then opens radially.

[0008] Furthermore, the second sleeve is movably sleeved on the screw rod, the first elastic piece, the first sleeve and the second elastic piece are sequentially sleeved outside the second sleeve, and the inclined surface of the second sleeve faces one side of the limiting portion.

[0009] Furthermore, a radially outward side of the elastic piece is provided with a protrusion for increasing friction.

[0010] Furthermore, the raised portion includes a plurality of raised blocks.

[0011] Furthermore, the limiting portion includes a chassis fixed to the first end surface; the chassis is concentric with the screw and has a radius larger than the screw, so as to push the spring piece to axially displace toward the second end of the screw.

[0012] Furthermore, a spring washer and a gasket are sequentially provided between the sleeve and the nut.

[0013] Furthermore, the nut is a lock nut.

[0014] On the other hand, the present invention also provides an anti-loosening fixing assembly, comprising the expansion anti-loosening bolt as described above.

[0015] Compared to traditional expansion bolts, the expansion locking bolt provided by this invention is more suitable for securing softer foundations. To operate, the first step is to use a screw to pull the stopper, pulling the movable sleeve and spring outward. The movable sleeve then presses the spring radially outward against the wall of the pipe hole. The spring presses outward against the wall to form a fixed point for locking. This bolt assembly is suitable for softer foundations and is stable and secure, unlike traditional expansion bolts, which are prone to loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an expansion anti-loosening bolt according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic structural diagram of an expansion anti-loosening bolt according to an embodiment of the present invention when in fixed use;

[0018] Figure 3 The figure is a schematic diagram of the spring structure of an expansion anti-loosening bolt according to an embodiment of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0020] 1. Screw; 2. Chassis; 3. First spring piece; 4. First sleeve; 5. Second spring piece; 6. Second sleeve; 7. Spring washer; 8. Washer; 9. Nut; 10. Protrusion; 11. Base body. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following is a clear and complete description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the specific details described below are only some embodiments of the present invention, and the present invention can also be implemented in many other embodiments different from those described herein. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] In one embodiment, see the attached Figure 1 and attached Figure 2 As shown, an expansion anti-loosening bolt includes a screw rod 1, a radially protruding limiting portion fixed to one side of the first end of the screw rod 1; and also includes a spring piece, a sleeve, and a nut 9 that are sequentially sleeved on the screw rod 1 from one side of the limiting portion toward the second end; the spring piece and the sleeve can move axially relative to the screw rod 1, and the nut 9 is threadedly connected to the screw rod 1; the spring piece extends toward the second end of the screw rod 1 while tilting radially outward, and the end of the sleeve close to the spring piece is provided with an inclined surface that matches the tilt direction of the spring piece. It is understandable that when the inclined surface contacts the spring piece, it can push the spring piece to tilt radially outward and then contact the hole wall. For hole walls made of soft materials, it can also be squeezed and inserted to greatly improve the fixing effect.

[0025] Compared to traditional expansion bolts, the expansion locking bolt provided by the present invention is more suitable for securing relatively soft foundations. To operate, the first step is to use the screw 1 to pull the limiter, pulling the movable sleeve and spring outward. The movable sleeve then presses the spring radially outward against the wall of the pipe hole. The spring pushes outward against the wall to form a fixed point for locking. This bolt assembly is suitable for relatively soft foundations 11, providing stability and security, unlike traditional expansion bolts that are prone to loosening.

[0026] In this embodiment, the number of spring clips and sleeves is two, including a first spring clip 3, a first sleeve 4, a second spring clip 5, and a second sleeve 6. The combination of two sets of spring clips and sleeves achieves two fixing points, which provides a better fixing effect than the existing single fixing point. Of course, other combinations of spring clips and sleeves, such as three or four, are also possible and are not limited to the description in this embodiment.

[0027] When the screw 1 moves outward from the hole, the limiting portion pushes the first spring piece 3 to displace, causing it to abut against the inclined surface of the first sleeve 4 and then expand radially. The first sleeve 4 pushes the second spring piece 5 to displace, causing it to abut against the inclined surface of the second sleeve 6 and then expand radially. It can be understood that through these two sets of results, the spring pieces expand as the screw 1 moves outward, thereby forming a compression fixing point with the hole wall, thereby achieving the fixing function.

[0028] Furthermore, the second sleeve 6 is movably connected to the screw 1, and the first elastic piece 3, the first sleeve 4, and the second elastic piece 5 are sequentially connected to the outside of the second sleeve 6, with the inclined surface of the second sleeve 6 facing one side of the limit portion. Of course, the arrangement position combination of the two sets of sleeves and elastic pieces can also be other, which is not limited to the description in this embodiment.

[0029] Refer to the attached Figure 3 As shown, in this embodiment, a radially outward-facing surface of the spring clip is provided with a raised portion 10 for increasing friction. It is understood that the other surface of the spring clip can be smooth to facilitate the inclined surface's propulsion of the spring clip outward. In this embodiment, the raised portion 10 comprises a plurality of raised squares. These small squares increase friction with the hole wall, enhancing the securing effect. Of course, one surface of the hole wall can also be provided with friction patterns, or other shapes that enhance friction, and this is not limited to the description in this embodiment.

[0030] It should be noted that, in this embodiment, the limiting portion includes a chassis 2 fixed to the first end surface; the chassis 2 is concentric with the screw 1 and has a radius larger than the screw 1 to push the spring piece to axially displace toward the second end of the screw 1.

[0031] On the basis of this embodiment, a spring washer 7 and a washer 8 are further provided between the sleeve and the nut 9, and the nut 9 is a locking nut. The above results increase the tightness of the connection between the nut 9 and the screw 1, prevent the nut 9 from loosening, and improve the fixing effect.

[0032] On the other hand, the present invention also proposes an anti-loosening fixing assembly, including the above-mentioned expansion anti-loosening bolt, and achieves a better fixing effect through the combination of the expansion anti-loosening bolt and other components.

[0033] To use it, the first step is to tighten the locknut 9 by pulling the chassis 2 to pull the spring clip of the movable sleeve outward. The movable sleeve then presses the spring clip against the wall of the pipe hole. The locknut 9 is then screwed outward. The assembly should be fixed to the workpiece. The spring clip, lock washer 8, and lock nut 9 are then installed in sequence. The front and rear spring clips are locked together, creating two fixing points, unlike the single fixing point of traditional expansion bolts that are prone to loosening. This solution not only solves the problem of expansion bolts being easily loosened, but is also more suitable for fixing in areas with relatively soft foundations compared to traditional expansion bolts. Its structure makes the expansion bolts even less likely to loosen.

[0034] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations, substitutions, and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention should be determined by the claims.

Claims

1. An expansion anti-loosening bolt, comprising a screw, characterized in that: A radially protruding limiting portion is fixed to one side of the first end of the screw; it also includes a spring piece, a sleeve and a nut that are sequentially sleeved on the screw from one side of the limiting portion toward the second end; the spring piece and the sleeve can both move axially relative to the screw, and the nut is threadedly connected to the screw; the spring piece extends toward the second end of the screw while radially tilting outward, and the end of the sleeve close to the spring piece is provided with an inclined surface that is adapted to the inclination direction of the spring piece.

2. The expansion anti-loosening bolt according to claim 1, characterized in that: The number of the spring pieces and the number of the sleeves are both two, including a first spring piece, a first sleeve, a second spring piece and a second sleeve.

3. The expansion anti-loosening bolt according to claim 2, characterized in that: When the screw moves out of the hole: the limiting portion pushes the first elastic piece to displace, and the first elastic piece contacts the inclined surface of the first sleeve and then opens radially; the first sleeve pushes the second elastic piece to displace, and the second elastic piece contacts the inclined surface of the second sleeve and then opens radially.

4. The expansion anti-loosening bolt according to claim 3, characterized in that: The second sleeve is movably sleeved on the screw rod, the first elastic piece, the first sleeve and the second elastic piece are sequentially sleeved outside the second sleeve, and the inclined surface of the second sleeve faces one side of the limiting portion.

5. The expansion anti-loosening bolt according to claim 1, characterized in that: A radially outward side of the elastic piece is provided with a protrusion for increasing friction.

6. The expansion anti-loosening bolt according to claim 5, characterized in that: The raised portion includes a plurality of raised blocks.

7. The expansion anti-loosening bolt according to claim 1, characterized in that: The limiting portion includes a chassis fixed to the first end surface; the chassis is concentric with the screw and has a radius larger than the screw, so as to push the elastic piece to axially move toward the second end of the screw.

8. The expansion anti-loosening bolt according to claim 1, characterized in that: A spring washer and a gasket are sequentially provided between the sleeve and the nut.

9. The expansion anti-loosening bolt according to claim 1, characterized in that: The nut is a lock nut.

10. An anti-loosening fixing assembly, characterized in that: It comprises the expansion anti-loosening bolt according to any one of claims 1 to 9.

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