Installation tool, tangless helically coiled insert

Claim 1

A tool for inserting a tangless helically coiled insert in a tapped hole, the helically coiled insert having at least one free end with a recess in the inner thread of the free end, said tool comprising: a tubular body of substantially circular cross-section, said body including a portion at one end thereof having an aperture therein adapted to receive a tangless helically coiled insert; a mandrel insertable into said tubular body and adapted to receive the tangless insert for installation in the tapped hole, said mandrel having a portion with a cavity therein and further including, driving means at one end for applying a torque sufficient to install the insert in a tapped hole, a threaded portion at an end opposite said driving means and adjacent said body aperture for threading the tangless helically coiled insert thereupon, and means for engaging said mandrel within the insert for simultaneous movement of said mandrel and the insert, said means including a pivotable pawl having a laterally projecting hook means biased in a first direction and extending longitudinally in said mandrel cavity adjacent said mandrel threaded portion, said pawl having a free end with laterally projecting means thereon for automatically locating said pawl within the insert at the insert recess as said mandrel is rotated in a clockwise direction, with said pawl locating means disengaging automatically form the insert when said mandrel is rotated in a counterclockwise direction, with said pawl free end moving in a direction opposite said first biased direction as a result thereof.