Installation tool, tangless helically coiled insert

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.