US 4,695,208 AGranted

Tool holder

OwnerGerald K. Yankoffinventor

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Abstract

A tool holder which is convertible to perform a variety of machining operations such as threading, turning and grooving comprises a support bar formed with a cavity which receives a mounting block having a seat adapted to support an insert so that the top surface of the insert is exposed and its cutting edge extends outwardly from the seat. The insert is clamped within the seat by a clamping block, which is secured atop the insert by a machine screw. The top edge of the clamping block is formed with a beveled bearing surface which engages the head of the machine screw so that forces are applied to the clamping block upon tightening of the screw which urge the insert downwardly, rearwardly and inwardly against the walls of the mounting block seat. The clamping block and support bar also include coolant delivery passageways terminating in a discharge orifice lying atop the top surface of the insert, which function to accelerate coolant from a low velocity, high pressure stream to a coolant jet having a velocity of at least 250 feet per second when ejected from the discharge orifice across the top surface of the insert toward its cutting edge.

Claims4

Dependent claims

A tool holder for machining a workpiece with an insert having a top surface terminating with a cutting edge, comprising:

a support bar formed with a cavity defining a top wall having an outer face, said support bar being formed with a threaded bore terminating in a recessed seat at said outer face in said top wall;
a mounting block formed with a seat having a bottom wall, a side wall and a rear wall;
means for removably securing said mounting block within said cavity of said support bar, said seat of said mounting block receiving an insert so that the top surface of the insert is exposed;
a clamping block disposed within said cavity beneath said top wall of said support bar and atop the exposed, top surface of the insert, said clamping block being formed with a beveled edge terminating with a bearing surface;
a screw having a tapered head matable with said recessed seat in said outer face of said top wall of said support bar and said bearing surface of said clamping block, said screw being inserted into said threaded bore of said support bar so that said tapered head of said screw engages both said recessed seat in said support bar and said bearing surface in said clamping block to force said clamping block against the insert for clamping the insert against said bottom wall, said side wall and said rear wall of said mounting block.

2 more elements

Dependencies are inferred from the claim text.