Automatic back and front spotfacing and counterboring tools

A spotfacing and counterboring tool comprising

• an elongate tool body having on one end a shank for attachment to and for rotation selectively in opposite directions by a machine tool spindle,
• a cutter blade pivotally mounted adjacent one end thereof in a recess in the opposite end of said tool body for pivotal movement between an inoperative position within said recess and an operative position in which the opposite end of the blade projects out of said recess at one side of said body,
• an operating member mounted for reciprocation in an axial bore in said body between first and second limit positions, and extending at one end thereof into said recess,
• means drivingly connecting said one end of said operating member to said one end of said blade, whereby reciprocation of said member between its two limit positions effects pivotal movement of said blade between its operative and inoperative positions, respectively,
• an actuating ring surrounding said tool body adjacent said shank and having in its inner peripheral surface an operating recess extending between opposite ends of said ring, and
• means connecting said tool body to said ring for rotation therewith, and for limited rotation relative to said ring each time the rotation of said tool body is reversed,
• said means including an actuator element secured at one end to said operating member for reciprocation therewith, and slidably seated at its opposite end in said operating recess in said ring, and
• said operating recess in said actuating ring being operative during the rotation of said tool body relative to said ring, to cause said actuator element to shift the attached operating member axially from one to the other of its limit positions.