Patent ID: 7568865

Claim:
A thread forming tool assembly for thread chaser heads comprising: a steel holder block with a bottom, a top, a base end, a tool carrier end, a first side wall and a second side wall; a chaser head engaging flat bottom surface on the bottom, a chaser head engaging flat side surface on the first side wall, and a chaser head clamp engaging flat surface on the second side wall; a holder arcuate surface on the tool carrier end of the steel holder block facing away from the base end, and a fixed radius about an arcuate surface axis that is in a plane that is parallel to the chaser head engaging flat bottom surface and spaced from said top on the opposite side of the top from said bottom, a radially extending stop surface intersecting the arcuate surface at a valley and extending radially toward a stop surface axis that is vertically spaced above and parallel to the arcuate surface axis and wherein the radially extending stop surface terminates at a ridge on the tool carrier end, a threaded bore in the steel holder block, and a holder pin bore in the steel holder block that intersects the holder arcuate surface; a carbide tool includes an arcuate tool surface that engages the holder arcuate surface on the steel holder block, a tool stop surface that engages the radially extending stop surface on the steel holder block, a tool pin slot in the holder arcuate surface that receives a tool pin mounted in the holder pin bore, and a carbide tool thread forming surface that is intersected by the arcuate tool surface and has a plurality of grooves in the carbide tool thread forming surface that form a plurality of thread forming ridges that form threads on work-pieces; and a screw that screws into the threaded bore in the steel holder block and clamps the carbide tool in the valley in the steel holder block.