Anchors with continuous involute expansion cone
By designing a continuous involute protrusion on the expansion cone end face of the anchor bolt, the problem of anchor bolt self-rotation is solved, installation efficiency and connection stability are improved, and loosening is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-14
AI Technical Summary
Existing anchor bolts are prone to self-rotation during the tightening process, which affects installation efficiency.
The bolt adopts a continuous involute expansion cone design. The expansion cone end face of the bolt has at least two protrusions that extend along the axial direction and transition through a continuous involute to reduce unnecessary rotation and enhance the pressure locking effect with the hole wall.
It effectively reduces the self-rotation of anchor bolts during the tightening process, improves installation efficiency, enhances the stable connection between anchor bolts and the hole wall, and reduces loosening during use.
Smart Images
Figure CN224497026U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building fasteners, specifically to an anchor bolt with a continuous involute expansion cone. Background Technology
[0002] Most existing anchor bolts use anchor bolts with a circular cross-section expansion cone. After the nut is rotated, the bolt is pulled outward, which compresses the end of the fixed expansion sleeve, causing it to expand evenly and form an expansion head in the pre-drilled hole, thus anchoring it inside the base.
[0003] Because the expansion cone has a circular cross-section, the anchor bolt is prone to self-rotation relative to the expansion sleeve during the tightening process, which affects the installation efficiency. Utility Model Content
[0004] The purpose of this invention is to provide an anchor bolt with a continuous involute expansion cone, in order to solve the technical problem in the prior art where the anchor bolt and the expansion sleeve are prone to self-rotation during the tightening process, which affects the installation efficiency.
[0005] For the purposes described above, this application provides an anchor bolt with a continuous involute expansion cone, comprising: an anchor bolt rod, an expansion sleeve, and a nut;
[0006] The expansion sleeve is fitted onto the anchor bolt, and both ends of the anchor bolt extend out of the expansion sleeve.
[0007] One end of the anchor bolt is connected to a nut, and the other end of the anchor bolt is provided with an expansion cone. The end face of the expansion cone has at least two protrusions in the circumferential direction. The protrusions extend along the axial direction of the expansion cone, and adjacent protrusions are transitioned by a continuous involute curve.
[0008] Furthermore, the protrusions are configured as three, and the three protrusions are connected by a continuous involute transition.
[0009] Furthermore, the three protrusions are evenly distributed along the circumference of the end face of the expansion cone.
[0010] Furthermore, the bottom edge of the expansion cone is rounded.
[0011] Furthermore, the end of the expansion cone used to connect with the anchor bolt has the same diameter as the expansion bolt, and the diameter of the end of the expansion cone away from the anchor bolt is larger than the diameter of the anchor bolt.
[0012] Furthermore, the expansion cone and the anchor bolt are an integral structure.
[0013] Furthermore, at least one weight-reducing groove is provided on the anchor bolt.
[0014] Furthermore, at least one gasket is provided between the expansion sleeve and the nut.
[0015] By adopting the above technical solution, the anchor bolt with a continuous involute expansion cone provided in this application has the following technical advantages compared with the prior art:
[0016] In this design, an expansion sleeve is fitted onto the anchor bolt, with both ends of the anchor bolt extending beyond the expansion sleeve. One end of the anchor bolt is connected to a nut, and the other end is fitted with an expansion cone. The end face of the expansion cone has at least two protrusions circumferentially, extending along its axis, with adjacent protrusions transitioning into a continuous involute curve. During application, applying torque to the nut causes it to move, forcing the expansion sleeve to press against the expansion cone of the anchor bolt, thus opening one end of the expansion sleeve and anchoring it to the pre-drilled hole sidewall. Because the expansion cone has at least two protrusions circumferentially, this design reduces unnecessary rotation of the anchor bolt during tightening, allowing it to generate pressure against the bottom hole sidewall more quickly. The stable structure also effectively reduces loosening during use by securing the anchor bolt. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the assembly structure of anchor bolts in the prior art;
[0019] Figure 2 This is a schematic diagram of the structure of an anchor bolt with a continuous involute expansion cone provided in an embodiment of this application;
[0020] Figure 3 In the anchor bolt with a continuous involute expansion cone provided in the embodiments of this application,
[0021] A structural schematic diagram of the anchor bolt in first-person view;
[0022] Figure 4 In the anchor bolt with a continuous involute expansion cone provided in the embodiments of this application,
[0023] A schematic diagram of the anchor bolt from a second-person perspective.
[0024] Icons: 1-Anchor bolt A; 2-Nut A; 3-Expansion sleeve A; 4-Expansion cone A;
[0025] 10-Anchor bolt; 11-Weight reduction groove; 20-Expansion sleeve; 30-Nut; 40-Expansion cone; 41-Protrusion; 42-Continuous involute; 50-Washer. Detailed Implementation
[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 do not 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0029] Figure 1 A schematic diagram of the assembly structure of an anchor bolt in the prior art is shown; such as Figure 1 As shown, the existing anchor bolt A1, which uses a circular cross-section expansion cone 4A, is pulled outward after the nut A2 rotates. This exerts pressure on the end of the fixed expansion sleeve A3, causing it to expand uniformly and form an expansion head within the pre-drilled hole, thus anchoring it inside the substrate. Because the expansion cone 4A has a circular cross-section, the anchor bolt A1 is prone to self-rotation relative to the expansion sleeve A3 during the tightening process.
[0030] The present application provides an anchor bolt with a continuous involute expansion cone, which is an improvement on the existing anchor bolt structure. It effectively reduces the self-rotation phenomenon of the anchor bolt during the fastening process, while the anchor bolt is easier and faster to embed into the cement matrix and maintains the long-lasting firmness of the connection.
[0031] like Figure 2 , Figure 3 and Figure 4 As shown, the anchor bolt with a continuous involute expansion cone includes: anchor bolt 10, expansion sleeve 20 and nut 30;
[0032] The expansion sleeve 20 is sleeved on the anchor bolt 10, and both ends of the anchor bolt 10 extend out of the expansion sleeve 20.
[0033] One end of the anchor bolt 10 is connected to the nut 30, and the other end of the anchor bolt 10 is provided with an expansion cone 40. The end face of the expansion cone 40 has at least two protrusions 41 in the circumferential direction. The protrusions 41 extend along the axial direction of the expansion cone 40, and adjacent protrusions 41 are transitioned by a continuous involute 42. For example, when two protrusions 41 are provided, the two protrusions 41 are symmetrically arranged in the circumferential direction of the end face of the expansion cone 40.
[0034] As a preferred embodiment, there are three protrusions 41, which are transitioned by a continuous involute 42, and the three protrusions 41 extend along the axial direction of the expansion cone 40.
[0035] As a preferred embodiment, the three protrusions 41 are evenly distributed in the circumferential direction of the end face of the expansion cone 40.
[0036] The innovative design of the anchor bolt in this embodiment is that the expansion cone 40 of at least two protrusions 41 (preferably three protrusions 41) transitions into a continuous involute 42, which reduces unnecessary rotation of the anchor bolt during the tightening process, generates pressure against the bottom hole sidewall more quickly, and locks the anchor bolt 10 through a stable three-point support structure, effectively reducing the loosening problem that easily occurs during use due to the uncertain actual anchoring of the traditional circular expansion cone 40 and its inability to prevent reverse rotation.
[0037] As a preferred implementation, the bottom edge of the expansion cone 40 is rounded to facilitate the smooth entry of the expansion cone 40 into the expansion sleeve 20 during use.
[0038] As a preferred embodiment, the end of the expansion cone 40 that is connected to the anchor bolt 10 has the same diameter as the anchor bolt 10, and the diameter of the end of the expansion cone 40 that is away from the anchor bolt 10 is larger than the diameter of the anchor bolt 10, so that the anchor bolt 10 can gradually expand the expansion sleeve 20 during movement.
[0039] As a preferred implementation, the expansion cone 40 and the anchor bolt 10 are integrated into one structure, that is, they are machined as a single piece, which results in better overall strength.
[0040] As a preferred embodiment, at least one weight-reducing groove 11 is provided on the anchor bolt 10 to reduce the weight of the anchor bolt 10.
[0041] As a preferred embodiment, at least one gasket 50 is provided between the expansion sleeve 20 and the nut 30.
[0042] The working principle of the anchor bolt with a continuous involute expansion cone provided in this embodiment is as follows:
[0043] In application, the expansion sleeve 20 is sleeved on the anchor bolt 10, and both ends of the anchor bolt 10 extend out of the expansion sleeve 20 respectively;
[0044] One end of the anchor bolt 10 is connected to the washer and nut 30. By applying torque to the nut 30, the nut 30 moves, forcing the expansion sleeve 20 to squeeze the expansion cone 40 of the anchor bolt 10, thereby causing one end of the expansion sleeve 20 to open and anchor to the pre-drilled hole sidewall.
[0045] Because the expansion cone 40 has multiple protrusions 41 on its end face circumferential direction, this design reduces unnecessary rotation of the anchor bolt during the tightening process, generates pressure against the bottom hole sidewall more quickly, and effectively reduces loosening during use by locking the anchor bolt screw 10 through a stable structure.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An anchor bolt with a continuous involute expansion cone, characterized in that, Includes anchor bolts, expansion sleeves, and nuts; The expansion sleeve is fitted onto the anchor bolt, and both ends of the anchor bolt extend out of the expansion sleeve. One end of the anchor bolt is connected to a nut, and the other end of the anchor bolt is provided with an expansion cone. The end face of the expansion cone has at least two protrusions in the circumferential direction. The protrusions extend along the axial direction of the expansion cone, and adjacent protrusions are transitioned by a continuous involute curve.
2. The anchor bolt with a continuous involute expansion cone according to claim 1, characterized in that, The protrusions are configured as three, and the three protrusions are connected by a continuous involute transition.
3. The anchor bolt with a continuous involute expansion cone according to claim 2, characterized in that, The three protrusions are evenly distributed along the circumference of the end face of the expansion cone.
4. The anchor bolt with a continuous involute expansion cone according to claim 1, characterized in that, The bottom edge of the expansion cone is rounded.
5. The anchor bolt with a continuous involute expansion cone according to claim 1, characterized in that, The end of the expansion cone used to connect with the anchor bolt has the same diameter as the expansion bolt, and the diameter of the end of the expansion cone away from the anchor bolt is larger than the diameter of the anchor bolt.
6. The anchor bolt with a continuous involute expansion cone according to claim 1, characterized in that, The expansion cone and the anchor bolt are an integral structure.
7. The anchor bolt with a continuous involute expansion cone according to claim 1, characterized in that, At least one weight-reducing groove is provided on the anchor bolt.
8. The anchor bolt with a continuous involute expansion cone according to claim 1, characterized in that, At least one gasket is provided between the expansion sleeve and the nut.