Extraction tool for tanged helically coiled inserts with improved removability

摘要

An apparatus for removing helical thread inserts having a removal notch formed along the female thread surface. The apparatus can selectively extract helical thread inserts by selectively engaging the removal notch and actuating the end of the insert radially inward to prevent the end of the insert from engaging threads of the bore which it is disposed in. The apparatus includes a handle, a head attached to the handle and a manually operable key. The head includes a hole formed in an offset location. A key having an engaging lip on the end is disposed in the hole and acting along a eccentric pattern to selectively engage the removal notch of the insert and allow for easier removal of the insert.