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Self undercut anchor

A bottom anchor and self-cutting technology, which is applied to structural elements, building components, building reinforcements, etc., can solve the problems that the self-cutting bottom cannot reach the bottom of the hole, hinder the sinking, and cannot exert the maximum anchoring effect.

Inactive Publication Date: 2011-04-13
朱国强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both theory and practice can prove that the self-cutting bottom of the expansion sleeve cannot reach the bottom of the hole because the expansion sleeve does not have the function of actively guiding the sinking, and the expanded bottom of the expansion sleeve also increases the effect of the hole wall to hinder the sinking. As a result, there is still the deficiency that the above-mentioned prior art cannot bring into play the maximum anchoring effect

Method used

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  • Self undercut anchor
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  • Self undercut anchor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The self-cutting undercut anchor of the present embodiment is as figure 1 and figure 2 As shown, one end of the anchor rod 2 has an inverted conical head made in one piece, and the other end is shaped on a triangular external thread. The expansion sleeve 1 is set on the anchor rod 2. The pipe wall of the expansion sleeve 1 adjacent to the end of the inverted cone head is made with external threads, and there are four opening grooves a uniformly distributed along the circumference. Beveled towards the helical direction of the external thread, thus forming a cutting edge with an acute angle A. The root of the opening groove a extends from the inside to the outside of the tube wall of the expansion tube 1 along the transition arc b. The end of the expansion sleeve 1 facing away from the reverse cone head is formed with two symmetrical radial grooves c, so as to form a circumferential restraint structure with the corresponding protrusions of the screwing tool.

[0015]...

Embodiment 2

[0019] The self-cutting undercut anchor of the present embodiment is as image 3 As shown, its basic structure is the same as that of the embodiment, and will not be described in detail. The main difference is that the threaded end of the expansion sleeve 1 has a positive taper, so it can gradually expand in diameter like a self-tapping screw when screwing in, and the effect is better. In addition, because the anchor rod 2 is relatively long, it is composed of a whole threaded rod and an inverted cone head 2' screwed on its end. After the expansion tube 1, there is also a structure with the expansion tube 1 that is stuck in the radial groove c. The connected extension pipe 5 is formed with a circumferential restraint structure similar to the radial groove c (not shown in the figure) at the outer end of the extension pipe 5 .

[0020] During use, the positioning method of the anchor bolt is the same as that of Embodiment 1. After it reaches the bottom-cut position and is secur...

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Abstract

The invention relates to a self undercut anchor, which belongs to the technical field of fastening pieces. The self undercut anchor is provided with a roof bolt and an expansion sleeve sleeved on the roof bolt, wherein one end of the roof bolt is an inverted conical head. A pipe wall on one end of the expansion sleeve close to the inverted conical head is provided with an open slot distributed along circumference; and the pipe wall on one end of the expansion sleeve close to the inverted conical head is provided with an outside thread. An end of the roof bolt departing from the inverted conical head is provided with a circumferential restraining structure. When used, the roof bolt is inserted into a hole together with the expansion sleeve, and when the inverted conical head is located at the bottom of the hole, the expansion sleeve is pressed and screwed by an assistant tool of a restraining structure which restrains the external circumferential direction, thereby the expansion sleevescrew can expand while being screwed to the bottom of the hole as much as possible through the screwing effect of the thread. The expansion sleeve then can reach a perfect state by the stretching andexpanding force of the major diameter of the inverted conical head, thereby distinctly strengthening the anchoring effect.

Description

technical field [0001] The invention relates to an anchor bolt mainly used in the building decoration industry, in particular to a self-cutting bottom anchor bolt, which belongs to the technical field of fasteners. Background technique [0002] Anchor bolts are commonly used fasteners in industries such as architectural decoration, and there are many types. Its basic typical structure is as disclosed in the Chinese invention patent application number 200320100106.6, including anchor rods, fixing sleeves, connecting sleeves and connecting rings (scientific name expansion sleeves) that can expand radially under the action of external force. When in use, the expansion sleeve can be protrudingly deformed or expanded under the action of external force, so as to contact and compress the wall of the installation hole, so that the anchor shaft can be anchored reliably without radial shaking. However, the expansion sleeve of this type of anchor bolt cannot be located at the bottom o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04F13/22E04C5/12
Inventor 朱国强
Owner 朱国强