Cutting Tool With Insert Having A Tapered Bottom

Abstract

A cutting tool for use in impinging earth strata includes a cutting tool body that contains a socket at an axial forward end thereof and an insert structured and arranged for being affixed to the cutting tool body within the socket. The insert includes a mounting end portion at an axial rearward end of the insert. The mounting end portion includes a first tapered segment, a second tapered segment adjacent and axially rearward of the first tapered segment wherein the second tapered segment has an axial rearward end diameter, and a base adjacent and axially rearward of the second tapered segment, the base having a base diameter that is greater than the axial rearward end diameter of the second tapered segment. The socket is structured and arranged for cooperating with the mounting end portion of the insert.

1 . A cutting tool for use in impinging earth strata, the cutting tool comprising:
 a cutting tool body with a central longitudinal axis and having a head portion at an axial forward end, a collar portion axially rearward of the head portion, and a shank portion axially rearward of the collar portion at an axial rearward end, the cutting tool body containing a socket at the axial forward end thereof; and   an insert structured and arranged for being affixed to the cutting tool body within the socket, the insert having the same central longitudinal axis as the cutting tool body, the insert comprising a generally conical tip portion at an axial forward end of the insert, a central portion adjacent and axially rearward of the generally conical tip portion and a mounting end portion at an axial rearward end of the insert, the mounting end portion adjacent and axially rearward of the central portion, the mounting end portion comprising:
 a first tapered segment adjacent and axially rearward of the central portion; 
 a second tapered segment adjacent and axially rearward of the first tapered segment, the second tapered segment having an axial rearward end diameter; and 
 a base adjacent and axially rearward of the second tapered segment, the base having a base diameter that is greater than the axial rearward end diameter of the second tapered segment. 
   
     
     
         2 . The cutting tool of  claim 1 , wherein the first tapered segment of the insert tapers inwardly toward the axial rearward end of the insert. 
     
     
         3 . The cutting tool of  claim 2 , wherein the second tapered segment of the insert tapers inwardly toward the axial rearward end of the insert. 
     
     
         4 . The cutting tool of  claim 1 , wherein the first tapered segment of the insert tapers at a first angle from the central longitudinal axis. 
     
     
         5 . The cutting tool of  claim 4 , wherein the second tapered segment of the insert tapers at a second angle from the central longitudinal axis, wherein the first angle of the first tapered segment is different from the second angle of the second tapered segment. 
     
     
         6 . The cutting tool of  claim 1 , wherein the socket defines an opening at the axial forward end of the cutting tool body and the socket comprises:
 a first tapered wall adjacent and axially rearward of the opening;   a second tapered wall adjacent and axially rearward of the first tapered wall; and   a base portion adjacent and axially rearward of the second tapered wall.   
     
     
         7 . The cutting tool of  claim 6 , wherein the first tapered wall of the socket is structured and arranged for cooperating with the first tapered segment of the insert. 
     
     
         8 . The cutting tool of  claim 7 , wherein the second tapered wall of the socket is structured and arranged for cooperating with the second tapered segment of the insert. 
     
     
         9 . The cutting tool of  claim 8 , wherein the base portion of the socket is structured and arranged for cooperating with the base of the insert. 
     
     
         10 . The cutting tool of  claim 8 , wherein the second tapered wall of the socket has an axial rearward end diameter and the base portion of the socket has a base portion diameter that is greater than the axial rearward end diameter of the second tapered wall. 
     
     
         11 . The cutting tool of  claim 6 , wherein the first tapered wall of the socket tapers at a first angle from the central longitudinal axis. 
     
     
         12 . The cutting tool of  claim 11 , wherein the second tapered wall of the socket tapers at a second angle from the central longitudinal axis, wherein the first angle of the first tapered wall is different from the second angle of the second tapered wall. 
     
     
         13 . A cutting tool insert having a central longitudinal axis, the cutting tool insert comprising:
 a generally conical tip portion at an axial forward end of the cutting tool insert;   a central portion adjacent and axially rearward of the generally conical tip portion;   a mounting end portion at an axial rearward end of the cutting tool insert, the mounting end portion adjacent and axially rearward of the central portion, the mounting end portion comprising:
 a first tapered segment adjacent and axially rearward of the central portion; 
 a second tapered segment adjacent and axially rearward of the first tapered segment, the second tapered segment having an axial rearward end diameter; and 
 a base adjacent and axially rearward of the second tapered segment, the base having a base diameter that is greater than the axial rearward end diameter of the second tapered segment. 
   
     
     
         14 . The cutting tool insert of  claim 13 , wherein the first tapered segment tapers inwardly toward the axial rearward end of the cutting tool insert. 
     
     
         15 . The cutting tool insert of  claim 14 , wherein the second tapered segment tapers inwardly toward the axial rearward end of the cutting tool insert. 
     
     
         16 . The cutting tool insert of  claim 13 , wherein the first tapered segment tapers at a first angle from the central longitudinal axis of the cutting tool insert. 
     
     
         17 . The cutting tool insert of  claim 16 , wherein the second tapered segment tapers at a second angle from the central longitudinal axis of the cutting tool insert, wherein the first angle of the first tapered segment is different from the second angle of the second tapered segment. 
     
     
         18 . A cutting tool body with a central longitudinal axis, the cutting tool body comprising:
 a head portion at an axial forward end of the cutting tool body, the head portion having a socket that defines an opening at the axial forward end;   a collar portion axially rearward of the head portion; and   a shank portion axially rearward of the collar portion at an axial rearward end,   wherein the socket comprises:
 a first tapered wall adjacent and axially rearward of the opening; 
 a second tapered wall adjacent and axially rearward of the first tapered wall; and 
 a base portion adjacent and axially rearward of the second tapered wall. 
   
     
     
         19 . The cutting tool body of  claim 18 , wherein the second tapered wall of the socket has an axial rearward end diameter and the base portion of the socket has a base portion diameter that is greater than the axial rearward end diameter of the second tapered wall. 
     
     
         20 . The cutting tool body of  claim 18 , wherein the first tapered wall of the socket tapers at a first angle from the central longitudinal axis and the second tapered wall of the socket tapers at a second angle from the central longitudinal axis, the first angle of the first tapered wall being different from the second angle of the second tapered wall.