Patent ID: 6544127
Filing Date: 2003-04-08
Classification: B23G

Abstract:
A chasing tool for repairing damaged internal threads, comprising:a housing of a substantially U-shaped cross-section accommodating a four-bar linkage delineating an elongated parallelogram formed of first and second oppositely located relatively short bars and first and second oppositely located relatively long bars, the first, upper, short bar being the stationary bar of said linkage and being constituted by a section of said housing, the second, lower, short bar being constituted by the center line of a cutter disposed in a mount, said relatively long first and second bars being constituted by lever-like members articulated to said short bar; handle means for operating such tool, attached to said housing, and screw means, the rotation of which causes said long bars to swivel relative to said stationary bar, whereby said cutter is moved relative to said housing, with the center line of said cutter maintaining its parallel position relative to said stationary linkage bar.