Elastic fastening expansion bolt

Abstract

The utility model relates to the field of expansion bolts. An elastic fastening expansion bolt comprises a screw rod sleeved with a spring piece, the outer portion of the screw rod is in threaded connection with a nut cap, an extrusion boss is arranged on one side of the nut cap, the screw rod is sleeved with the extrusion boss, a step sleeve is connected to the extrusion boss in a sleeved mode, and blade cylinders are fixedly connected to the two ends of a cylinder sleeve. According to the elastic fastening expansion bolt, by knocking the extrusion boss, the extrusion boss extrudes the step sleeve to be limited, compressed and folded, the diameter of the middle of the step sleeve is increased, the step sleeve is limited in a drill hole, the step sleeve is prevented from being extruded by the screw to generate displacement when the nut cap and the screw are screwed in a threaded mode, and position limitation between the step sleeve and the drill hole is improved; and when the nut cap is screwed with the screw thread, the displaced nut cap further pushes the extrusion boss to extrude the folded and deformed step sleeve, so that the blade cylinder parts at the two ends of the step sleeve are further extruded with the tail end of the screw and the extrusion boss respectively and are expanded outwards to be dispersed, and the stability of the limiting between the step sleeve and the interior of the drill hole is further improved.

Description

Technical Field

[0001] This utility model relates to the field of expansion bolt technology, specifically to an elastic fastening expansion bolt. Background Technology

[0002] In the field of building installation, expansion bolts are commonly used fasteners. However, existing expansion bolts often result in unstable connections to wall holes due to various factors. For example, the tapered nut and expansion sleeve of traditional expansion bolts are prone to relative rotation (slippage), and the expansion sleeve and the wall hole surface also rotate relative to each other, thus weakening the expansion and fixing effect. Furthermore, when used in wall holes made of soft material, some expansion bolts require a considerable distance to achieve a tight fixation, and the large gap between the bolt and the sleeve can cause wobbling, affecting the installation quality of the workpiece. Therefore, designing a new type of elastic fastening expansion bolt to improve the stability of its connection to wall holes is of great significance.

[0003] Therefore, a flexible fastening expansion bolt is needed. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an elastic fastening expansion bolt to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an elastic fastening expansion bolt, comprising a screw rod with an externally sleeved spring element, a nut cap externally threaded onto the screw rod, a pressing boss provided on one side of the nut cap, the pressing boss being sleeved on the outside of the screw rod and fitted with a stepped sleeve;

[0006] The stepped sleeve includes a sleeve with multiple bending grooves, and blade cylinders are fixed to both ends of the sleeve.

[0007] Preferably, the screw is arranged in a stepped structure.

[0008] Preferably, one side of the nut cap has multiple anti-detachment tabs fixedly attached in a ring-shaped, equally spaced structure.

[0009] Preferably, a limiting groove is provided on one side of the extrusion boss to fit with the anti-detachment corner piece, and multiple extrusion strips with an inclined structure are fixedly connected to the outside of the extrusion boss in an annular, equally spaced structure.

[0010] Preferably, the inner wall of one end of the extrusion boss is provided with a storage groove that can be clearance-fitted with the nut cap.

[0011] Preferably, the blade cylinder is externally fixed with thread teeth that are opposite to the screw thread.

[0012] This invention provides a flexible fastening expansion bolt. Compared with the prior art, it has the following advantages:

[0013] 1. This elastic fastening expansion bolt, by striking and compressing the boss, causes the boss to compress and fold the stepped sleeve, increasing the diameter of the stepped sleeve in the middle and limiting it inside the drill hole. This prevents the stepped sleeve from shifting due to screw compression when the nut and screw thread are tightened, improving the positional constraint between the stepped sleeve and the drill hole. As the nut and screw thread are tightened, the displaced nut further pushes the boss to compress and deform the stepped sleeve, causing the blade cylinders at both ends of the stepped sleeve to further compress the tail end of the screw and the boss, expanding and dispersing outwards. This further improves the stability of the stepped sleeve's position within the drill hole, enhancing the robustness of the expansion bolt structure. When the boss compresses and displaces the stepped sleeve, a spring fitted outside the screw provides elastic restraint, maintaining the stability of the position between the screw and the drill hole.

[0014] 2. This elastic fastening expansion bolt, by striking and compressing the boss, causes the boss to compress and fold the stepped sleeve, increasing the diameter of the stepped sleeve in the middle and limiting it inside the drill hole. This prevents the stepped sleeve from shifting due to screw compression when the nut and screw thread are tightened, improving the positional constraint between the stepped sleeve and the drill hole. As the nut and screw thread are tightened, the displaced nut further pushes the boss to compress and deform the stepped sleeve, causing the blade cylinders at both ends of the stepped sleeve to further compress the tail end of the screw and the boss, expanding and dispersing outwards. This further improves the stability of the stepped sleeve's position within the drill hole, enhancing the robustness of the expansion bolt structure. When the boss compresses and displaces the stepped sleeve, the elastic constraint of the spring fitting outside the screw helps maintain the stability of the position between the screw and the drill hole. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the overall structure of this utility model broken down.

[0017] Figure 3 This is a schematic diagram of the nut cap structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the extrusion boss structure of this utility model.

[0019] In the diagram: 1. Screw; 2. Nut cap; 3. Extrusion boss; 4. Stepped sleeve; 21. Anti-detachment plate; 31. Limiting groove; 32. Extrusion strip; 41. Sleeve; 42. Blade cylinder; 43. Threaded teeth. Detailed Implementation

[0020] 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, other embodiments obtained by those of ordinary skill in the art without creative effort are all within the scope of protection of the present utility model.

[0021] Please see Figure 1 and Figure 2 As shown, this utility model provides a technical solution: an elastic fastening expansion bolt, including a screw 1 with an externally sleeved spring, a nut cap 2 externally threaded to the screw 1, a pressing boss 3 on one side of the nut cap 2, the pressing boss 3 being sleeved on the outside of the screw 1, and a stepped sleeve 4 being sleeved on it;

[0022] The stepped sleeve 4 includes a sleeve 41 with multiple bends and grooves, and blade sleeves 42 are fixedly connected to both ends of the sleeve 41.

[0023] By striking and pressing the extrusion boss 3, the extrusion boss 3 compresses and folds the stepped sleeve 4, increasing the diameter of the stepped sleeve 4 in the middle and limiting it inside the drill hole. This prevents the stepped sleeve 4 from being displaced by the screw 1 when the nut cap 2 is screwed into the screw 1, thus improving the positional constraint between the stepped sleeve 4 and the drill hole. As the nut cap 2 is screwed into the screw 1, the displaced nut cap 2 further pushes the extrusion boss 3 to compress and deform the stepped sleeve 4. This causes the blade cylinders 42 at both ends of the stepped sleeve 4 to be further compressed against the tail end of the screw 1 and the extrusion boss 3, expanding and dispersing outwards. This further improves the stability of the step sleeve 4 in the internal constraint of the drill hole, enhancing the robustness of the expansion bolt structure. When the extrusion boss 3 causes displacement of the stepped sleeve 4, it can be elastically limited by the spring fitting outside the screw 1, abutting against the screw 1 to maintain the stability of the position between the step sleeve 4 and the drill hole.

[0024] like Figure 2 As shown, screw 1 is arranged in a stepped structure.

[0025] At this point, it is worth noting that the screw 1 is configured with a stepped structure. This stepped structure ensures that when the extrusion boss 3 extrudes the stepped sleeve 4 and moves, the displaced stepped sleeve 4 extrudes the spring sleeve on the outside of the screw 1. The compressed spring sleeve is supported and limited by the screw 1. This ensures that when the extrusion boss 3 extrudes the stepped sleeve 4 and moves, it can maintain the stability of the screw 1 and the position between it and the drill hole under the elastic limit of the spring sleeve on the outside of the screw 1.

[0026] like Figure 3 As shown, one side of the nut cap 2 has a ring-shaped, equally spaced structure with multiple anti-dislodgement tabs 21 fixedly attached.

[0027] At this point, it is worth noting that multiple anti-disengagement tabs 21 are fixedly attached to one side of the nut cap 2 in a ring-shaped, equally spaced structure. When the nut cap 2 is pressed and constrained with the equipment mounting bracket, the anti-disengagement tabs 21 on one side of the nut cap 2 increase the frictional resistance between them, ensuring the tightness of the pressurization of the equipment bracket structure when the nut cap 2 and the screw 1 are connected by threads.

[0028] like Figure 4 and Figure 3 As shown, a limiting groove 31 that can fit with the anti-detachment plate 21 is provided on one side of the extrusion boss 3, and multiple extrusion strips 32 with inclined structure are fixed to the outside of the extrusion boss 3 in an annular and equally spaced structure. A storage groove that can be clearance-fitted with the nut cap 2 is provided on the inner wall of one end of the extrusion boss 3.

[0029] At this point, it is worth noting that a limiting groove 31 that can fit with the anti-dislodgement plate 21 is provided on one side of the extrusion boss 3, which can further enhance the stability of the contact between the nut cap 2 and the extrusion boss 3, and improve the stability of the extrusion boss 3 on the extrusion deformation of the blade cylinder 42 in the stepped sleeve 4. With the support of the extrusion strip 32, the extrusion boss 3 can anti-slip limit the expanded blade cylinder 42, enhance the frictional resistance between the two, and a storage groove that can be fitted with the nut cap 2 is provided on the inner wall of one end of the extrusion boss 3. The storage groove can be used to store the nut cap 2 that is threaded to the screw 1 in the opposite direction, ensuring that the stepped sleeve 4 has the length requirement and improving the overall structure of the expansion screw.

[0030] like Figure 1 As shown, the blade cylinder 42 is externally fixed with threaded teeth 43 that are opposite to the thread of the screw 1.

[0031] At this point, it is worth noting that a threaded tooth 43 with the opposite thread to the screw 1 is fixed to the outside of the blade cylinder 42. By utilizing the threaded tooth 43 structure with the opposite thread to the screw 1, it is possible to ensure that when the nut cap 2 is tightened by the threaded connection with the screw 1, the extrusion boss 3, which rotates synchronously with the nut cap 2, drives the stepped sleeve 4 to rotate and spirally tightens it with the inside of the drill hole, thereby further improving the firmness of the connection between the stepped sleeve 4 and the drill hole.

[0032] When using this expansion bolt structure to fix it inside the drill hole, the user should first unscrew the nut cap 2 that is screwed in the opposite direction to the outside of the screw rod 1, and then insert the remaining expansion bolts after removing the nut cap 2 structure into the drill hole.

[0033] Next, the extrusion boss 3 is struck, and the displaced extrusion boss 3 pushes the stepped sleeve 4 to limit and fold, increasing the outer diameter of the middle sleeve 41 structure of the stepped sleeve 4, and shortening the length of the sleeve 41. At the same time, the blade cylinder 42 is appropriately extruded to expand outward, and is firmly limited and constrained with the drill hole.

[0034] Then, insert the bracket or equipment base to be installed into the screw 1 and tighten the nut cap 2.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A resilient fastening expansion bolt characterised in that, include: A screw (1) with an externally fitted spring is provided. The screw (1) is externally threaded with a nut cap (2). A pressing boss (3) is provided on one side of the nut cap (2). The pressing boss (3) is fitted on the outside of the screw (1) and fitted with a stepped sleeve (4). The stepped sleeve (4) includes a sleeve (41) with multiple bending grooves, and blade sleeves (42) are fixed to both ends of the sleeve (41).

2. A resilient fastening expansion bolt according to claim 1 wherein: The screw (1) is arranged in a stepped structure.

3. A resilient fastening expansion bolt according to claim 1 wherein: The nut cap (2) has multiple anti-dislodgement tabs (21) fixed on one side in a ring-shaped, equally spaced structure.

4. The elastic fastening expansion bolt according to claim 1, characterized in that: The extrusion boss (3) has a limiting groove (31) on one side that can fit with the anti-detachment plate (21), and the extrusion boss (3) has a ring-shaped, equally spaced structure with multiple extrusion strips (32) arranged in an inclined structure fixed to its exterior.

5. An elastic fastening expansion bolt according to claim 4, wherein: The inner wall of one end of the extrusion boss (3) is provided with a storage groove that can be clearance-fitted with the nut cap (2).

6. A resilient fastening expansion bolt according to claim 1 wherein: The blade cylinder (42) is externally fixed with thread teeth (43) that are opposite to the thread of the screw (1).

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