Cutting tool for breaking or excavating machines

Abstract

A cutting tool for breaking or excavating machines, comprising: a tool body,a main tip ( 1 ), and a plurality of ancillary tips ( 3 ), wherein the ancillary tips ( 3 ) comprises a plurality of tapered cutting tips ( 7 ) or a plurality of cutting edges ( 8 ) for breaking operation; and the ancillary tips ( 3 ) are disposed on the tool body ( 2 ) around the main bit tip ( 1 ). The cutting tool for breaking or excavating machines of the invention is capable of increasing and elongating the wear resistance capability without sacrifice its penetrating ability so as to extend the service life of the bit, as well as increase its working efficiency and safety.

1 . A cutting tool for breaking or excavating machines, comprising:
 a tool body ( 2 );   a main tip ( 1 ); and   a plurality of ancillary tips ( 3 );   
       wherein
 said ancillary tips ( 3 ) comprise a plurality of tapered cutting tips ( 7 ) or a plurality of cutting edges ( 8 ) for breaking operation; and 
 said ancillary tips ( 3 ) are disposed on said tool body ( 2 ) around the main bit tip ( 1 ). 
 
     
     
         2 . The cutting tool of  claim 1 , wherein said cutting tips ( 7 ) are in the shape of a cone, a frustum, a semi-ellipsoid, or a spherical dome, and the sectional area of the ancillary tip ( 3 ) becomes smaller along its axis. 
     
     
         3 . The cutting tool of  claim 1 , wherein said cutting edges ( 8 ) have a single wedge or multiple wedges. 
     
     
         4 . The cutting tool of  claim 2 , wherein said tool body ( 2 ) has a front surface ( 5 ), and ends of said cutting tips ( 7 ) are installed above said front surface ( 5 ). 
     
     
         5 . The cutting tool of  claim 3 , wherein said tool body ( 2 ) has a front surface ( 5 ), and ends of said cutting edges ( 7 ) are installed above or flush with said front surface ( 5 ). 
     
     
         6 . The cutting tool of  claim 1 , wherein the ratio between radius of said ancillary tip ( 3 ) and length of said ancillary tip ( 3 ) is in the range of between 1:1.5 and 1:5. 
     
     
         7 . The cutting tool of  claim 1 , wherein between 3 and 50 ancillary tips ( 3 ) are installed around the main tip ( 1 ). 
     
     
         8 . The cutting tool of  claim 1 , wherein between 6 and 20 ancillary tips ( 3 ) are installed around the main tip ( 1 ). 
     
     
         9 . The cutting tool of  claim 1 , wherein the buried length of said ancillary tip ( 3 ) is more than one third of the length of said main tip ( 1 ). 
     
     
         10 . The cutting tool of  claim 1 , wherein the buried length of said ancillary tip ( 3 ) is more than one third of the maximum diameter of said main tip ( 1 ). 
     
     
         11 . The cutting tool of  claim 1 , wherein the buried portion of said ancillary tip ( 3 ) is in the shape of a cylinder, a cone, or a truncated cone. 
     
     
         12 . The cutting tool of  claim 1 , wherein
 said main tip ( 1 ) is made of a first material;   said ancillary tips ( 3 ) are made of a second material;   said tool body ( 2 ) is made of a third material;   said first material is harder than said third material; and   said second material is harder than said third material.