Tool for repairing damaged threads in a blind hole

A tool for repairing damaged internal threads in a blind hole, comprising in combination:

• an elongate tool body defining a medial axially aligned forcing arbor channel and having
• at a first forward end a threading tap with a relaxed diameter incrementally less than the minimum diameter of an internally threaded hole to be repaired, the threading tap having
• at least one radially extending flute defined therethrough and through the body element spacedly adjacent to the threading tap to allow radial expansion,
• an external configuration that when expanded defines a surface that is complementary to internal threads in a hole to be repaired, and
• an axial length so that it may be inserted into a blind hole beyond a point of thread damage to there be expanded into a mating relationship with undamaged threads defined in that hole inwardly of the damaged threads, and
• at a second rearward end having means to aid the turning thereof;
• and
• an elongate forcing arbor having an arbor body carried in the forcing arbor channel defined in the tool body for axial slidable motion, said arbor body having a length less than the length of said tool body, and further having
• at a first rearward end a threaded portion extending axially outwardly from the tool body and carrying a threadedly engaged nut, and
• at a second forward end a forcing cone extending axially forward of the tool body and movable within the forward portion of the forcing arbor channel responsive to motion of the nut on said threaded portion of the forcing arbor to radially expand the threading tap into adjacency with threads to be repaired.