Countersink reamer for three-dimensional interior/exterior rims of a small bore

摘要

A countersink reamer for three dimensional interior/exterior small bores, being comprised mainly of a plurality of O rings, piano wires and an electric or pneumatic hand tool with a claw and rotatable to provide moving power; the piano wires are arranged in a bundle, the front end thereof are welded and fixed, and their rear end are welded to a cylindrical seat, those of the piano wires not welded are fitted over with several O rings, the bundle of piano wires connected to the cylindrical seat is inserted to be mounted on the claw of the electric or pneumatic hand tool; so that rough edges resulted on both the interior and the exterior bore rims of a small rough bore on a normal workpiece can be synchronically abraded and countersink-reamed by swivelling grinding and cutting action of the piano wires which are rotating after having been inserted into the bore with the O rings abutting against the wall of the bore and been activated for rotation. The present invention can exactly overcome the technical impediments ineliminable in the conventional techniques in abrasing rough edges created on and countersink-reaming on the three dimensional interior/exterior small bores.