Patent ID: 6203253
Filing Date: 2001-03-20
Classification: B21J,B23B,Y10T

Abstract:
An attachment for removing a rivet from a bore in a panel, said attachment being mountable to a modified body of an adjustable countersink tool having a vertically reciprocating drive shaft and comprising:a generally cylindrical, hollow drill cage having an upper end for threadingly engaging an exterior of said modified body so that a vertical position of said drill cage is selectively adjustable by rotating said drill cage on said body, and a lower end having a narrow annular lip;a drill bit which is mountable to a lower end of said drive shaft so that said bit extends downwardly through said hollow interior of said drill cage, said drill bit having a diameter equal to or just slightly smaller than that of a shaft of said rivet; anda guide bushing which is mountable to a lower end of said drill cage, said guide bushing comprising:an annular flange portion having an outer edge which does not project outwardly substantially beyond said annular lip on said lower end of said drill cage, said flange portion having a broad, flat, base surface that extends inwardly from said outer edge of said flange portion for resting in stabilizing engagement against a surface of material surrounding said rivet;an axial guide bore having a diameter that closely matches said diameter of said drill bit, so that said guide bore maintains axial alignment of said drill bit with said shaft of said rivet and ensures that said bit is confined within said bore in said panel as said bit passes therethrough; anda socket formed centrally in said base surface for receiving a head of said rivet therein and maintaining said shaft of said rivet in coaxial alignment with said axial bore and said drill bit which is guided therethrough.