Expansion bolt

Abstract

The utility model relates to the technical field of fasteners, in particular to an expansion bolt which comprises a stud pull rod, an expansion sleeve and a nut. The stud pull rod comprises a screw rod part and an expansion end part arranged at one end of the screw rod part, a guide block is arranged on the screw rod part, and the guide block is arranged at the position where the screw rod part is connected with the expansion end part; the expansion sleeve is arranged on the outer side of the stud pull rod in a sleeving mode, a plurality of notches evenly distributed in the circumferential direction are formed in one end of the expansion sleeve so as to form a plurality of arc expansion pieces, and the notches are matched with the guide blocks; and the nut is in threaded connection with the stud pull rod. The expansion screw cannot rotate in the tightening process, so that the tightening process is more convenient and simpler.

Description

Technical Field

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

[0002] Metal expansion bolts are commonly used when fixing various supports on concrete floors and walls. In daily use, we often encounter situations where the expansion bolts are placed in pre-drilled holes, and when tightening them, the nut and the central thread rotate together, causing the support to fail to stay in place. This wastes a lot of time dealing with the problem. If the support is not securely fixed, it can cause it to shake or fall off, resulting in mechanical or personal injury and posing a safety hazard. Utility Model Content

[0003] In view of the shortcomings of the prior art, the present invention provides an expansion bolt that does not rotate during the tightening process, thereby making the tightening process more convenient and simple.

[0004] To achieve the above objectives, the present invention provides an expansion bolt comprising a stud rod, an expansion sleeve, and a nut. The stud rod includes a threaded portion and an expansion end portion disposed at one end of the threaded portion. A guide block is provided on the threaded portion, and the guide block is disposed at the position where the threaded portion connects with the expansion end portion. The expansion sleeve is sleeved on the outside of the stud rod, and one end of the expansion sleeve has multiple notches evenly distributed in the circumferential direction to form multiple arc-shaped expansion plates. The notches cooperate with the guide block. The nut is threadedly connected to the stud rod.

[0005] Furthermore, the expanded end has a conical surface, which is used to compress the plurality of arc-shaped expansion plates.

[0006] Furthermore, the expanded end is an expanded ball fixed to the screw portion.

[0007] Furthermore, each of the arc-shaped expansion plates has at least one through hole, and a reinforcing steel nail protruding from the inside out is provided inside the through hole.

[0008] Furthermore, the end of the reinforcing steel nail located inside the expansion sleeve is configured with a rounded top surface.

[0009] Furthermore, one guide block is provided, confined within one of the notches.

[0010] Furthermore, the top surface of the guide block on the side opposite to the screw portion is 2mm higher than the outer surface of the expansion sleeve.

[0011] The beneficial effects of this utility model are as follows: The stud tie rod is equipped with a guide block, and the outer expansion sleeve has a notch that matches the width of the guide block. During processing, the guide block and the notch are positioned correspondingly. In use, the method is the same as that of conventional expansion bolts: drill a hole in the substrate, insert the expansion bolt into the hole, start rotating the nut, and pull the stud tie rod to move. As the tail of the stud tie rod moves outward, it causes the outer expansion sleeve to contact the concrete, generating friction. At the same time, due to the mutual limiting cooperation between the stud tie rod and the outer expansion sleeve, the notch and the guide block prevent rotation during the tightening process, thus making the tightening process more convenient and simple. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an expansion bolt in one embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of an expansion bolt in another embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the stud tie rod in one embodiment of the present invention;

[0015] Figure 4 This is a cross-sectional view of an expansion bolt in one embodiment of the present invention;

[0016] Figure 5 for Figure 4 Cross-sectional view of AA in the middle;

[0017] Figure 6 This is a schematic diagram of the expansion sleeve in one embodiment of the present invention;

[0018] In the picture:

[0019] 100. Stud tie rod; 110. Screw section; 111. Guide block; 120. Expansion end; 121. Conical surface; 122. Expansion ball.

[0020] 200. Expansion sleeve; 210. Notch; 220. Arc-shaped expansion plate; 230. Reinforcing steel nail; 231. Arc-shaped top surface.

[0021] 300. Nuts. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] See Figure 1 The diagram shows a structural schematic of an expansion bolt provided by this utility model, which includes a stud rod 100, an expansion sleeve 200, and a nut 300. The stud rod 100 includes a screw portion 110 and an expansion end portion 120 disposed at one end of the screw portion 110. A guide block 111 is disposed on the screw portion 110, and the guide block 111 is disposed at the position where the screw portion 110 and the expansion end portion 120 are connected. The expansion sleeve 200 is sleeved on the outside of the stud rod 100. One end of the expansion sleeve 200 has a plurality of notches 210 evenly distributed in the circumferential direction to form a plurality of arc expansion pieces 220. The notches 210 cooperate with the guide block 111. The nut 300 is threadedly connected to the stud rod 100.

[0024] When machining the tail end of the expansion bolt, a guide block 111 is added to the side of the stud tie rod 100. The outer expansion sleeve 200 has a notch 210 that matches the width of the guide block 111. During machining, the guide block 111 and the notch 210 are positioned correspondingly. In use, the expansion bolt is inserted into a hole drilled in the substrate, and the nut 300 is rotated to pull the stud tie rod 100. As the tail of the stud tie rod 100 moves outward, the outer expansion sleeve 200 comes into contact with the concrete, generating friction. At the same time, the stud tie rod 100 and the outer expansion sleeve 200 are mutually restrained by the notch 210 and the guide block 111, preventing rotation during tightening and making the tightening process more convenient and simple.

[0025] It should be noted that in this embodiment, the guide block 111 is a strip-shaped guide block. Besides a strip-shaped guide block, it can also be configured as a columnar structure, as long as it can cooperate with the notch 210 for limiting and guiding. Specifically, for ease of operation, the strip-shaped guide block can be formed by welding, or a cylindrical pin can be welded onto the stud rod 100.

[0026] like Figure 1 As shown, in one embodiment, the expansion end 120 has a conical surface 121 for pressing a plurality of arcuate expansion pieces 220 to cause the plurality of arcuate expansion pieces 220 to expand outward.

[0027] SeeFigures 2-6 In another embodiment, the expansion end 120 is an expansion ball 122 fixed to the screw portion.

[0028] In one embodiment, each arc-shaped expansion piece 220 has at least one through hole, and a reinforcing steel nail 230 protruding from the inside out is disposed inside the through hole.

[0029] During processing, four through holes are machined at the end of the expansion sleeve 200, and four sturdy reinforcing steel nails 230 are placed therein. Correspondingly, the end of the central stud tie rod 100 is set as an expansion ball 122 to engage with the arc-shaped expansion piece 220. In use, holes are drilled in the substrate, expansion bolts are inserted into the holes, and the nut 300 is rotated, driving the stud tie rod 100 to move outward. The outward movement of the tail of the stud tie rod 100 pushes the outer expansion sleeve 200 into contact with the concrete, creating friction. Simultaneously, the expansion ball 122 compresses the four reinforcing steel nails 230, forcing the stud tie rod 100 tightly into the substrate, making the fixation more robust and reliable. It should be noted that, in addition to the structure shown in the figure where each arc-shaped expansion piece 220 has one through hole, if a further strengthening effect is desired, two through holes can be made on each arc-shaped expansion piece 220, each with a reinforcing steel nail 230, arranged side-by-side.

[0030] like Figure 4 and Figure 5 As shown, in one embodiment, the end of the reinforcing steel nail 230 located inside the expansion sleeve 200 is configured with an arc-shaped top surface 231. With this configuration, as the expansion ball 122 moves continuously, the spherical surface of the expansion ball 122 will cooperate with the arc-shaped top surface 231 of the reinforcing steel nail 230, allowing the reinforcing steel nail 230 to pass through the through hole and be driven into the base. The spherical surface and the arc-shaped top surface 231 can slide relatively smoothly, which is conducive to the movement of the reinforcing steel nail 230.

[0031] In one embodiment, a guide block 111 is provided and is confined in one of the notches 210.

[0032] In one embodiment, the top surface of the guide block 111 on the side opposite to the screw portion 110 is 2 mm higher than the outer surface of the expansion sleeve 200.

[0033] In one specific embodiment, the stud rod 100 can be configured as a split structure, with an expansion end 120 detachably provided at one end of the screw portion 110. The same screw portion 110 can be replaced and adapted to expansion balls 122 or conical structures of different sizes. Specifically, a threaded blind hole is machined at one end of the screw portion 110, and a threaded connector is fixed to the expansion ball 122 or conical structure. In use, an expansion ball 122 or conical structure of a suitable size can be screwed into the threaded blind hole of the screw portion 110, connecting them as a single unit, thus increasing the flexibility of the device. In the above embodiment, it is only necessary to set the guide block 111 on the surface of a universal screw portion 110 and at the connection point between the screw portion 110 and the expansion end 120. It is not necessary to set guide blocks 111 on the outer surface of both the expansion ball 122 and the conical structure. This method is more reasonable, easier to process, and saves costs.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 are not intended to 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.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. An expansion bolt, characterized in that: include A stud tie rod includes a screw portion and an expansion end portion disposed at one end of the screw portion. A guide block is disposed on the screw portion and the guide block is disposed at the position where the screw portion and the expansion end portion connect. An expansion sleeve is fitted onto the outside of the stud tie rod. One end of the expansion sleeve has multiple notches evenly distributed in the circumferential direction to form multiple arc-shaped expansion plates. The notches cooperate with the guide block. The nut is threadedly connected to the stud rod.

2. An expansion bolt according to claim 1, characterized in that: The expanded end has a conical surface, which is used to compress the plurality of arc-shaped expansion plates.

3. An expansion bolt according to claim 1, characterized in that: The expansion end is an expansion ball fixed to the screw section.

4. An expansion bolt according to any one of claims 1-3, characterized in that: Each of the arc-shaped expansion plates has at least one through hole, and a reinforcing steel nail protruding from the inside out is provided inside the through hole.

5. An expansion bolt according to claim 4, characterized in that: The end of the reinforcing steel nail located inside the expansion sleeve is configured with a rounded top surface.

6. An expansion bolt according to any one of claims 1-3, characterized in that: One guide block is provided, which is confined to one of the notches.

7. An expansion bolt according to any one of claims 1-3, characterized in that: The top surface of the guide block on the side opposite to the screw part is 2mm higher than the outer surface of the expansion sleeve.

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