An expansion sleeve and removable expansion bolt

Abstract

The utility model relates to expansion bolt technical field discloses an expansion sleeve and detachable expansion bolt, detachable expansion bolt includes screw rod, nut and expansion sleeve, and the expansion sleeve is sleeved on the screw rod, and the screw rod includes taper head and threaded rod part, and the maximum diameter of convex part is not less than the maximum diameter of taper head, and the nut is connected with threaded rod part threadedly, and the expansion sleeve includes expansion part and convex part, and the expansion part has at least two force deformable petal, and taper head and petal extrude fit to make petal deformation outspread, and the convex part is rotary body structure and the outer diameter is greater than the outer diameter of expansion part. Through setting up convex part, can reduce the contact area of expansion sleeve and the inner wall of drilling, and keep the stability of expansion sleeve installation simultaneously, when disassembling, make taper head away from expansion part through pushing screw rod, can easily pull out expansion sleeve from the drilling, solved the traditional expansion bolt disassembly difficult problem disclosed a kind of.

Description

Technical Field

[0001] This utility model relates to the field of expansion bolt technology, and in particular to an expansion sleeve and a detachable expansion bolt. Background Technology

[0002] Expansion bolts are commonly used fixing components in building decoration, typically consisting of a threaded rod, a nut, and an expansion sleeve. In existing expansion bolts, the diameter of the expansion sleeve is matched to the drilled hole, and after installation, the expansion sleeve fits tightly against the inner wall of the hole, thus achieving fixation. However, this structure makes disassembly difficult due to the large contact area between the expansion sleeve and the drilled hole wall, causing inconvenience in practical use. Therefore, there is an urgent need for an expansion bolt that can be easily disassembled. Utility Model Content

[0003] Therefore, it is necessary to provide an expansion sleeve and a detachable expansion bolt to address the aforementioned technical problems.

[0004] To achieve the above objectives, in a first aspect, the present invention provides an expansion sleeve, comprising an expansion portion and a protrusion portion. The expansion portion has at least two deformable lobes, and a conical head is pressed and engaged with the lobes to cause the lobes to deform and expand outward. The protrusion portion has a rotating body structure and its outer diameter is larger than that of the expansion portion.

[0005] As an optional technical solution of this utility model, the protrusion has two symmetrically arranged first conical surfaces.

[0006] As an optional technical solution of this utility model, the expansion part is provided with a notch, and the petals are formed by dividing the expansion part by the notch.

[0007] As an optional technical solution of this utility model, it also includes a baffle portion, with the protrusion located between the expansion portion and the baffle portion, and the maximum distance from the edge of the baffle portion to the center line of the expansion sleeve is greater than the maximum radius of the protrusion.

[0008] As an optional technical solution of this utility model, the expansion part and the baffle part are respectively located at both ends of the expansion sleeve.

[0009] As an optional technical solution of this utility model, the distance between the protrusion and the baffle is smaller than the distance between the protrusion and the expansion portion.

[0010] Secondly, this utility model also provides a detachable expansion bolt, including a screw, a nut and any of the expansion sleeves described above. The expansion sleeve is fitted onto the screw, which includes a conical head and a threaded shank. The maximum diameter of the protrusion is not less than the maximum diameter of the conical head, and the nut is threadedly connected to the threaded shank.

[0011] As an optional technical solution of this utility model, the maximum diameter of the protrusion is the same as the maximum diameter of the cone head.

[0012] As an optional technical solution of this utility model, the cone head has a second cone surface that contacts and cooperates with the expansion part.

[0013] As an optional technical solution of this utility model, the detachable expansion bolt also includes a washer, which is fitted on the screw part and located between the expansion sleeve and the nut.

[0014] The beneficial effects of this technical solution are as follows: by setting the protrusion, the contact area between the expansion sleeve and the inner wall of the borehole can be reduced, while maintaining the stability of the expansion sleeve installation; during disassembly, by pushing the screw to move the cone head away from the expansion part, the expansion sleeve can be easily pulled out of the borehole, solving the problem of difficult disassembly of traditional expansion bolts. Attached Figure Description

[0015] Figure 1 This is an exploded view of a detachable expansion bolt according to an embodiment of the present invention;

[0016] Figure 2 This is a perspective view of a detachable expansion bolt according to an embodiment of the present invention;

[0017] Figure 3 This is a front view of a detachable expansion bolt according to an embodiment of the present invention;

[0018] Figure 4 for Figure 3 A sectional view along line AA.

[0019] In the figure, 1 is the screw; 11 is the cone head; 111 is the second cone surface; 12 is the threaded rod part; 2 is the nut; 31 is the expansion part; 311 is the flap; 312 is the notch; 32 is the protrusion; 321 is the first cone surface; 33 is the baffle part; and 4 is the gasket. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1 to 4 This application provides a detachable expansion bolt, including a screw 1, a nut 2 and an expansion sleeve, with the expansion sleeve fitted onto the screw 1.

[0022] The screw 1 includes a conical head 11 and a threaded shank 12. The threaded shank 12 has external threads, and the nut 2 is threadedly connected to the threaded shank 12. The maximum diameter of the protrusion 32 is not less than the maximum diameter of the conical head 11. Specifically, the maximum diameter of the protrusion 32 can be set to be equal to the maximum diameter of the conical head 11, or it can be set to be slightly larger than the maximum diameter of the conical head 11. The diameter of the drilled hole is the same as the maximum outer diameter of the protrusion 32. This allows the protrusion 32 to contact the inner wall of the drilled hole when it enters the hole. Furthermore, because the contact area between the protrusion and the inner wall of the drilled hole is small, friction is reduced when disassembling the expansion sleeve, making disassembly easier.

[0023] The expansion sleeve includes an expansion portion 31, a protrusion 32, and a baffle portion 33. The expansion portion 31 has at least two deformable lobes 311. A notch 312 is provided on the expansion portion 31, and the lobes 311 are formed by dividing the expansion portion 31 by the notch 312. Specifically, four lobes 311 can be provided. The conical head 11 is pressed and engaged with the lobes 311 to cause the lobes 311 to deform and expand outward.

[0024] The protrusion 32 has a rotating body structure and its outer diameter is larger than that of the expansion portion 31. In this embodiment, the maximum diameter of the protrusion 32 and the maximum diameter of the cone head 11 are both 12 mm, and the diameter of the expansion portion 31 is 10 mm. The cone head 11 has a second cone surface 111 that contacts and engages with the expansion portion 31.

[0025] The protrusion 32 can compensate for the problem of insufficient contact points caused by the outer diameter of the expansion sleeve being smaller than the diameter of the borehole. This is because the expansion part 31 will contact the inner wall of the borehole after expansion, and the protrusion 32 will also continuously contact the inner wall of the borehole. The expansion sleeve has two positions that are in contact with the inner wall of the borehole, which can keep the expansion sleeve stable and prevent it from shaking inside the borehole.

[0026] The protrusion 32 is located between the expansion portion 31 and the baffle portion 33. The maximum distance from the edge of the baffle portion 33 to the center line of the expansion sleeve is greater than the maximum radius of the protrusion 32. The expansion portion 31 and the baffle portion 33 are located at opposite ends of the expansion sleeve. This prevents the baffle portion 33 from entering the borehole.

[0027] The distance between the protrusion 32 and the baffle 33 is smaller than the distance between the protrusion 32 and the expansion portion 31. In this way, when the protrusion 32 is inserted into the drill hole, it is closer to the entrance of the drill hole, and the distance the protrusion 32 moves in the drill hole during installation is shorter, making it easier to install into the drill hole and easier to pull out of the drill hole.

[0028] During installation, drill a hole with a diameter of 12mm, insert the expansion bolt into the hole, rotate the nut 2, and the nut 2 moves along the threaded rod 12, driving the screw 1 to move in the direction of the nut 2. The second conical surface 111 of the conical head 11 presses the flaps 311 of the expansion part 31, causing the flaps 311 to expand outward and press against the inner wall of the hole. At the same time, the protrusion 32 contacts the inner wall of the hole, ensuring the stability of the expansion sleeve in the hole.

[0029] During disassembly, first unscrew nut 2, remove washer 4, and then push screw 1 in the direction of drilling depth so that cone head 11 moves away from expansion part 31. When flap 311 loses the support of cone head 11, the expansion sleeve is pulled outward by baffle part 33. Under the squeezing force of the inner wall of the borehole, expansion part 31 contracts inward, and the expansion sleeve can be easily removed from the borehole.

[0030] In an optional embodiment, please refer to Figures 1 to 4 The protrusion 32 has two symmetrically arranged first conical surfaces 321. The arrangement of the first conical surfaces 321 facing the expansion portion facilitates insertion into the borehole, while the arrangement of the first conical surfaces 321 facing away from the expansion portion facilitates extraction from the borehole.

[0031] In an optional embodiment, please refer to Figures 1 to 4 The detachable expansion bolt also includes a washer 4, which is fitted onto the screw 1 and is located between the expansion sleeve and the nut 2.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0033] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[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.

Claims

1. An inflatable sleeve, characterized by It includes an expansion portion and a protrusion portion. The expansion portion has at least two deformable lobes. The cone head is squeezed and fitted with the lobes to cause the lobes to deform and expand outward. The protrusion portion has a rotating body structure and its outer diameter is larger than that of the expansion portion.

2. The inflatable sleeve of claim 1, wherein, The protrusion has two symmetrically arranged first conical surfaces.

3. The inflatable sleeve of claim 1, wherein, The expansion portion has a notch, and the petals are formed by dividing the expansion portion by the notch.

4. The inflatable sleeve of claim 1, wherein, It also includes a baffle portion, with a protrusion located between the expansion portion and the baffle portion, and the maximum distance from the edge of the baffle portion to the center line of the expansion sleeve is greater than the maximum radius of the protrusion portion.

5. The inflatable sleeve of claim 4, wherein, The expansion section and the baffle section are located at both ends of the expansion sleeve, respectively.

6. The inflatable sleeve of claim 5, wherein, The distance between the protrusion and the baffle is less than the distance between the protrusion and the expansion portion.

7. A removable expansion bolt, characterised in that, It includes a screw, a nut, and an expansion sleeve as described in any one of claims 1 to 6. The expansion sleeve is fitted onto the screw. The screw includes a conical head and a threaded shank. The maximum diameter of the protrusion is not less than the maximum diameter of the conical head. The nut is threadedly connected to the threaded shank.

8. The removable expansion bolt defined in claim 7, wherein, The maximum diameter of the protrusion is the same as the maximum diameter of the cone head.

9. The detachable expansion bolt according to claim 7, characterized in that, The cone head has a second cone surface that contacts and engages with the expansion portion.

10. The detachable expansion bolt according to claim 7, characterized in that, It also includes a gasket, which is fitted onto the screw section and located between the expansion sleeve and the nut.

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