Threading tool

Claim 2

A threading tool for cutting a helix thread on a cylindrical material which comprises: a. a tool body having a recess to receive a bank of cutting inserts, b. a plurality of cutting inserts banked side-by-side in said recess each having a cutting tooth spaced from each adjacent tooth projecting from said body in a banked array along a cutting line, c. means for maintaining said inserts securely in said recess, d. means for mounting said body relative to a rotating workpiece wherein said bank of cutting inserts is disposed at an angle to the workpiece wherein a relative longitudinal motion between said body and said workpiece will cause a helix thread to be cut in said workpiece, each tooth carrying a relatively light load as it moves along the woRkpiece, the means for securing said inserts comprising a pair of end blocks located at each end of said recess in said body, one of said end blocks being pivoted on said body to facilitate removal and indexing of indexable inserts in said recess, and e. a retaining rod threaded through apertures in said inserts and means to confine said retaining rod between said end blocks.

Claim 3

A tool block for cutting a helix thread on turning cylindrical work material which comprises: a. a tool body support to be retained on a support adjacent a cylindrical turning workpiece comprising a substantially rectangular block having a top surface, a front surface, end surfaces, and a bottom surface, said bottom surface serving to support the body, and an orientation surface lying in a plane at an angle to said top and bottom surfaces to orient the front of said body support relative to a workpiece, said body having an elongate tool recess at the top front corner shaped to receive converging edges of a plurality of identical, thin polygonal cutting inserts while permitting other converging edges to project from said body support at the conjunction of said front and top surfaces, b. a plurality of identical, thin polygonal cutting inserts in said elongate tool recess positioned side-by-side, each disposed in the same relative position to the front of said block, and c. means on said block to secure said inserts firmly in said recess, wherein disposing of said tool body at an angle to the axis of a cylindrical turning workpiece will cause progressive entry of said identical inserts in a thread turning operation as said parts are moved relative to each other along the axis of the turning workpiece.

Claim 4

A tool block for cutting a helix thread on turning cylindrical work material which comprises: a. a tool body support to be retained on a support adjacent a cylindrical turning workpiece comprising a substantially rectangular block having a top surface, a front surface, end surfaces, and a bottom surface, said bottom surface serving to support the body, and an orientation surface lying in a plane at an angle to said top and bottom surfaces to orient the front of said body support relative to a workpiece, said body having an elongate tool recess at the top front corner shaped to receive converging edges of a plurality of identical, thin polygonal cutting inserts while permitting other converging edges to project from said body support at the conjunction of said front and top surfaces, b. a plurality of identical, thin polygonal cutting inserts in said elongate tool recess positioned side-by-side, each disposed in the same relative position to the front of said block, and c. means on said block to secure said inserts firmly in said recess, wherein disposing of said tool body at an angle to the axis of a cylindrical turning workpiece will cause progressive entry of said identical inserts in a thread turning operation as said parts are moved relative to each other along the axis of the turning workpiece.

Claim 5

A tool block for cutting a helix thread on turning cylindrical work material which comprises: a. a tool body support to be retained on a support adjacent a cylindrical turning workpiece comprising a substantially rectangular block having a top surface, a front surface, end surfaces, and a bottom surface, said bottom surface serving to support the body, and an orientation surface lying in a plane at right angles to said top and bottom surfaces but angles relative to said front surface and said end surfaces to orient the front of said body support relative to a workpiece, said body having an elongate tool recess at the top front corner shaped to receive converging edges of a plurality of identical, thin polygonal cutting inserts while permitting other converging edges to project from said body support at the conjunction of said front and top surfaces, c. means at each end of said block to close said tool recess, d. means in said tool recess supported between said means at each end to support said inserts as a group in alignment in said tool recess, and d. means on said top surface disposed to exert pressure on each of said inserts individually to urge each said insert firmly into said recess.

Claim 6

A tool block for cutting a helix thread on turning cylindrical work material which comprises: a. a tool body support to be retained on a support adjacent a cylindrical turning workpiece comprising a substantially rectangular block having a top surface, a front surface, end surfaces, and a bottom surface, said bottom surface serving to support the body, and an orientation surface lying in a plane at right angles to said top and bottom surfaces but angles relative to said front surface and said end surfaces to orient the front of said body support relative to a workpiece, said body having an elongate tool recess at the top front corner shaped to receive converging edges of a plurality of identical, thin polygonal cutting inserts while permitting other converging edges to project from said body support at the conjunction of said front and top surfaces, c. means at each end of said block to close said tool recess, d. means in said tool recess supported between said means at each end to support said inserts as a group in alignment in said tool recess, and d. means on said top surface disposed to exert pressure on each of said inserts individually to urge each said insert firmly into said recess.

Claim 7

A tool block as defined in claim 3 in which one of said means at the ends of said block comprises an end plate having a portion to overlie one end of said tool recess and another portion pivotally secured to said block at an axis spaced from said recess to permit said plate to be pivoted away from said recess during assembly or re-orientation of said tool inserts.

Claim 8

A tool block as defined in claim 3 in which the means in said tool recess supported between said end means comprises a rod threaded through holes in said inserts, adjustable means on said rod within said tool recess to exert endwise pressure on said inserts, and means at one of said end means to exert endwise pressure on said rod to rigidly secure said rod and said inserts in said recess.

Claim 9

A tool block as defined in claim 3 in which said inserts are identical in size and shape and located in said recess perpendicular to the supporting walls, each in the same relative position to the front wall of the block, and each insert having at least one cutting tip projecting from Said recess, one side of said tip being normal to the walls of said recess and one side of said tip having a plunge angle backed off from said other side, wherein tilting of said inserts by the mounting means of said tool block will dispose said block at an angle to the rotation axis of the work material to dispose said cutting tips at progressively different distances from said axis while providing plunge clearance on both sides of said tip.