A pull-resistant expansion bolt

Abstract

The utility model discloses an anti -pulling expansion bolt, including expansion sleeve, the bolt body of having expansion head in one end, the bolt body of having the stud portion in the other end is worn in expansion sleeve, and the stud portion is connected with the lock nut on the screw thread, and the expansion sleeve is surrounded with a plurality of lateral mouth extending along the axial direction, and the U type elastic sheet is buried in the lateral mouth, and the U type elastic sheet includes the first elastic sheet partial body of arranging outward, the second elastic sheet partial body of arranging inward, the first elastic sheet partial body is connected with the expansion sleeve to the one end of facing expansion head, and the other end is connected with the second elastic sheet partial body, and the second elastic sheet partial body stretches out the inside of lateral mouth, and the first elastic sheet partial body under the natural state does not stretch out the outside of lateral mouth, and the extrusion ring is equipped on the bolt body, and the extrusion ring is equipped between the lateral mouth and expansion head. When the expansion bolt is in the expansion state at the sleeve head part, will make the extrusion ring extrude the U type elastic sheet outward, causes its to stretch out the aperture and press into the bolt hole hole wall of reserving, thereby strengthens the anti -pulling capacity.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and more specifically, to a pull-out resistant expansion bolt. Background Technology

[0002] Expansion bolts are fasteners that use expansion to generate friction or mechanical locking force to fix objects to hard base materials such as concrete, brick masonry, and stone. They are widely used in construction, decoration, and mechanical installation.

[0003] Traditional expansion bolts, when expanded at the sleeve head, can form a tight connection with the connected object, but there is still a risk of them coming loose under large pull-out forces. Therefore, this invention proposes a pull-out resistant expansion bolt. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an expansion bolt that is resistant to pull-out.

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: The present utility model relates to an anti-pull-out expansion bolt, including an expansion sleeve, a bolt body having an expansion head at one end and a stud at the other end passing through the expansion sleeve, a locking nut being threaded onto the stud, a plurality of axially extending side openings being distributed around the expansion sleeve, and U-shaped spring pieces being embedded in the side openings, the U-shaped spring pieces including a first spring piece segment arranged on the outer side and a second spring piece segment arranged on the inner side, the end of the first spring piece segment facing the expansion head being connected to the expansion sleeve and the other end being connected to the second spring piece segment, the second spring piece segment extending out of the inner side opening, the first spring piece segment not extending out of the outer side opening in its natural state, and a compression ring being provided on the bolt body, the compression ring being located between the side opening and the expansion head.

[0006] The present invention is further configured such that the end of the extrusion ring facing the side opening has a guide portion.

[0007] The present invention is further configured such that the second spring sheet is tightly attached to the first spring sheet.

[0008] The present invention is further configured such that the side openings are arranged in a ring array around the axis of the expansion sleeve.

[0009] The present invention is further configured such that the included angle between two adjacent side openings is equal.

[0010] The present invention is further configured such that: a spring washer is fitted on the stud portion, and the spring washer is located between the locking nut and the expansion sleeve.

[0011] In summary, the present invention has the following beneficial effects: the expansion bolt with pull-out resistance involved in the present invention, when the sleeve head is in an expanded state, will cause the extrusion ring to extrude the U-shaped spring piece outward, causing it to extend out of the hole and press into the wall of the reserved bolt hole, thereby enhancing the pull-out resistance, with complete overall function and strong practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the patent claims of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0014] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0015] Example 1 See Figure 1 As shown, the pull-out resistant expansion bolt involved in this embodiment includes an expansion sleeve 1. A bolt body 4 with an expansion head 2 at one end and a stud portion 3 at the other end is inserted inside the expansion sleeve 1. A locking nut 5 is threaded onto the stud portion 3. The expansion sleeve 1 has several side openings 6 extending axially around its periphery. A U-shaped spring piece 7 is embedded in the side opening 6. The U-shaped spring piece 7 includes a first spring piece 71 arranged on the outside and a second spring piece 72 arranged on the inside. The end of the first spring piece 71 facing the expansion head is connected to the expansion sleeve 1, and the other end is connected to the second spring piece 72. The second spring piece 72 extends out of the inside of the side opening 6. In its natural state, the first spring piece 71 does not extend out of the outside of the side opening 6. A compression ring 8 is provided on the bolt body 4, and the compression ring 8 is located between the side opening 6 and the expansion head 2.

[0016] Furthermore, the side openings 6 are arranged in a ring array around the axis of the expansion sleeve 1.

[0017] Furthermore, the included angle between two adjacent side openings 6 is equal.

[0018] Furthermore, a spring washer 9 is fitted onto the stud portion 3, and the spring washer 9 is located between the locking nut 5 and the expansion sleeve 1.

[0019] In this embodiment, when the bolt body 4 moves axially backward, the expansion head 2 gradually retracts into the expansion sleeve 1, causing the head of the expansion sleeve 1 to expand. At the same time, the compression ring 8 moves along with it, laterally compressing the U-shaped spring 7. The second spring shard 72, which extends out of the side opening 6, is gradually pressed into the side opening 6, thereby squeezing out the first spring shard 71 that was originally left in the side opening 6, so as to enhance the pull-out resistance of the expansion bolt.

[0020] Example 2 See Figure 1 As shown, the pull-out resistant expansion bolt involved in this embodiment is further configured, based on embodiment 1, with the end of the compression ring 8 facing the side opening having a guide portion 81.

[0021] In this embodiment, the guide part 81 is provided to prevent jamming between the compression ring 8, which moves axially, and the U-shaped spring piece 7.

[0022] Example 3 See Figure 1 As shown, the pull-out resistant expansion bolt involved in this embodiment is further configured, based on embodiment 1, with the second spring piece 72 tightly attached to the first spring piece 71.

[0023] In this embodiment, by setting the second spring piece 72 to be tightly attached to the first spring piece 71, when the second spring piece 72 is compressed, the force can be quickly transmitted to the first spring piece 71, causing the U-shaped spring piece 7 to deform rapidly.

[0024] The expansion bolt with pull-out resistance involved in this utility model, when the sleeve head is in an expanded state, will cause the compression ring to squeeze the U-shaped spring outward, causing it to extend out of the hole and press into the wall of the reserved bolt hole, thereby enhancing the pull-out resistance. The overall function is perfect and the practicality is strong.

[0025] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the actual orientation or positional relationship shown. They are used 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. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the embodiments and according to the specific circumstances.

[0026] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model 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 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.

[0027] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A pull-out resistant expansion bolt, comprising an expansion sleeve, wherein a bolt body having an expansion head at one end and a stud at the other end passes through the expansion sleeve, and a lock nut is threaded onto the stud, characterized in that: The expansion sleeve has several axially extending side openings, and U-shaped spring pieces are embedded in the side openings. The U-shaped spring pieces include a first spring piece component arranged on the outer side and a second spring piece component arranged on the inner side. The end of the first spring piece component facing the expansion head is connected to the expansion sleeve, and the other end is connected to the second spring piece component. The second spring piece component extends out of the inner side of the side opening. In its natural state, the first spring piece component does not extend out of the outer side of the side opening. The bolt body is provided with a compression ring, which is located between the side opening and the expansion head.

2. The pull-out resistant expansion bolt according to claim 1, characterized in that: The end of the extrusion ring facing the side opening has a guide portion.

3. The pull-out resistant expansion bolt according to claim 1 or 2, characterized in that: The second spring piece is attached tightly to the first spring piece.

4. The pull-out resistant expansion bolt according to claim 3, characterized in that: The side openings are arranged in a ring array around the axis of the expansion sleeve.

5. The pull-out resistant expansion bolt according to claim 4, characterized in that: The included angle between two adjacent side openings is equal.

6. The pull-out resistant expansion bolt according to claim 1, characterized in that: A spring washer is fitted onto the stud portion, and the spring washer is located between the locking nut and the expansion sleeve.

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