US 2018/0023606 A1 · EXPANSION ANCHOR

Abstract

An expansion anchor includes a hollow shaft 3 and a bolt 9 to be screwed thereinto from a base end side of the hollow shaft. The hollow shaft 3 is formed, at a portion thereof short of a tip end 3a, with a radially expansive portion 7 which includes slits 6, and a multiplicity of balls 10 are inserted into the radially expansive portion 7. When the bolt 9 is screwed, the balls 10 push against each other and move radially. As a result, the radially expansive portion 7 deforms expansively for securely engaging with a pre-formed hole 2. Even when the radially expansive portion 7 expands, stress does not concentrate at a specific portion of an installation region 1, so that it is possible to provide a high withdrawal resistance while preventing cone-type failure. The management of the withdrawal resistance can be easily performed by screwing the bolt 9) using a wrench with a torque limiter or by screwing the bolt 9 using a torque wrench.

Claims5

Dependent claims

An expansion anchor comprising:

a hollow shaft to be inserted, from a tip end thereof, into a pre-formed hole formed in an installation region, and a bolt to be screwed into the hollow shaft from outside the installation region,
wherein the hollow shaft is formed with a radially expansive portion, that is weakened to be bulgeable, at a portion of the hollow shaft within the pre-formed hole and short of the tip end of the hollow shaft, and the hollow shaft is internally provided with a radially expanding action member that pushes the radially expansive portion radially outward in response to pushing action caused by screwing of the bolt into the hollow shaft.

Dependencies are inferred from the claim text.

Expansion anchor

Life of this patent

Expansion anchor

Life of this patent

Abstract

Claims5