Tool for metal cutting

Abstract

A cutter adapted to be rotated about a front-to-rear extending longitudinal axis comprises a front portion having a cutting edge, and a rear portion for mounting a cutter. The rear portion has a conical outer periphery, the shortest radius of which is defined by a rearmost end of the rear portion. The rear portion includes a hook-shaped projection formed by a laterally open recess in the outer periphery.

We claim: 
     
       1. A cutter adapted to be rotated about a front-to-rear extending longitudinal axis and comprising a front portion having a cutting edge and a rear portion for mounting said cutter, said rear portion having a conical outer periphery, the shortest radius of which is defined by a rearmost end of said rear portion, said rear portion including a hook-shaped projection formed by a laterally open recess in said outer periphery, said recess including a generally rearwardly facing surface extending laterally inwardly from said outer periphery, a generally laterally outwardly facing second surface extending rearwardly from a laterally inner end of said first surface, a third surface facing generally toward said first surface and extending generally laterally outwardly from a rear end of said second surface, a laterally outer end of said third surface disposed laterally inwardly of an imaginary extension of said outer periphery. 
     
     
       2. A cutter according to claim 1 including a fourth surface facing generally laterally outwardly and extending rearwardly from a laterally outer end of said third surface to said rearmost end of said rear portion. 
     
     
       3. A cutter according to claim 1, wherein said third surface extends rearwardly and laterally outwardly. 
     
     
       4. A cutter according to claim 1, wherein said laterally inner end of said first surface is located adjacent said axis. 
     
     
       5. A cutter according to claim 1, wherein said periphery defines a cone angle less than twenty-five degrees. 
     
     
       6. A cutter adapted to be rotated about a front-to-rear extending longitudinal axis and comprising a front portion having a cutting edge and a rear portion for mounting said cutter, said rear portion having a conical outer periphery, the shortest radius of which is defined by a rearmost end of said rear portion, said rear portion including a hook-shaped projection formed by a laterally open recess in said outer periphery, said recess including a generally rearwardly facing first surface extending laterally inwardly from said outer periphery, a generally laterally outwardly facing second surface extending rearwardly from a laterally inner end of said first surface, a third surface facing generally toward said first surface and extending generally laterally outwardly from a rear end of said second surface, said recess extending circumferentially for no more than one-half the circumference of said outer periphery. 
     
     
       7. A cutter adapted to be rotated about a front-to-rear extending longitudinal axis and comprising a front portion having a cutting edge and a rear portion for mounting said cutter, said rear portion having a conical outer periphery, the shortest radius of which is defined by a rearmost end of said rear portion, said rear portion including a hood-shaped projection formed by a laterally open recess in said outer periphery, said recess including a generally rearwardly facing first surface extending laterally inwardly from said outer periphery, a generally laterally outwardly facing second surface extending rearwardly from a laterally inner end of said first surface, a third surface facing generally toward said first surface and extending generally laterally outwardly from a rear end of said second surface, a laterally inner end of said first surface being located adjacent said axis, said third surface extending rearwardly and laterally outwardly, a laterally outer end of said third surface disposed laterally inwardly of an imaginary extension of said outer periphery, said outer periphery defining a cone angle less than twenty-five degrees, said recess extending circumferentially for no more than one-half the circumference of said outer periphery. .Iadd. 
     
     
       8.  A cutter adapted to be rotated about a front-to-rear extending longitudinal axis and comprising a front portion having a cutting edge and a rear portion for mounting said cutter, said rear portion having a conical outer periphery, the shortest radius of which is defined by a rearmost end of said rear portion, said rear portion including a hook-shaped projection formed by a laterally open recess in said outer periphery, said recess including a generally rearwardly facing first surface extending laterally inwardly from said outer periphery, and an additional surface facing generally toward said first surface, said additional surface including laterally inner and outer ends and extending generally laterally outwardly and rearwardly from said laterally inner end to said laterally outer end, said laterally outer end of said additional surface being disposed laterally inwardly of an imaginary extension of said outer periphery. .Iaddend. .Iadd.9. A cutter adapted to be rotated about a front-to-rear longitudinal axis and comprising a front portion having a cutting edge and a rear portion for mounting said cutter, said rear portion having a conical outer periphery, the shortest radius of which is defined by a rearmost end of said rear portion, said rear portion including a hook-shaped projection formed by a laterally open recess in said outer periphery, said recess including a generally rearwardly facing first surface extending laterally inwardly from said outer periphery, and an additional surface facing generally toward said first surface, said additional surface including laterally inner and outer ends and extending generally laterally outwardly and rearwardly from said laterally inner end to said laterally outer end, said recess extending circumferentially for no more than one-half the circumference of said outer periphery. .Iaddend. 
     
     
        .Iadd.10.  A cutter adapted to be rotated about a front-to-rear longitudinal axis and comprising a front portion having a cutting edge and a rear portion for mounting said cutter, said rear portion having a conical outer periphery, the shortest radius of which is defined by a rearmost end of said rear portion, said rear portion including a hook-shaped projection formed by a laterally open recess in said outer periphery, said recess including a generally rearwardly facing first surface extending laterally inwardly from said outer periphery, and an additional surface facing generally toward said first surface, said additional surface including laterally inner and outer ends and extending generally laterally outwardly and rearwardly from said laterally inner end to said laterally outer end, said recess extending circumferentially for no more than one-half the circumference of said outer periphery, a laterally inner end of said first surface is located adjacent said axis, said laterally outer end of said additional surface being disposed laterally inwardly of an imaginary extension of said outer periphery, said outer periphery defining a cone angle less than twenty-five degrees. .Iaddend.