Pick For Earthworking Machine

Abstract

A pick to be used on an earth working roll for mining, construction and public works machines such as crushers, surface miners, milling machines and the like. The pick includes a working end with holes that extend into the pick and inserts are received into the holes. The inserts during operation impact and fracture a consolidated material to separate the material. Impacting the material generates heat in the pick at the working end of the pick which must be dissipated and attenuated to limit thermal fatigue in the inserts that occurs at high temperatures. The inserts in the working end are configured to dissipate the generated thermal energy from the inserts to the body of the pick.

1 . A pick for attachment to a driven roll for working a consolidated material comprising:
 a head configured to separate the consolidated material including:   a strike face;   holes that open at the strike face; and   inserts received in the holes that extend beyond the strike face to impact the consolidated material; and   a body that contacts the driven roll.   
     
     
         2 . The pick of  claim 1  where the inserts are equidistant about a center point of the strike face. 
     
     
         3 . The pick of  claim 1  where the holes are parallel to each other. 
     
     
         4 . The pick of  claim 1  where the angle between any two holes is between 5 and 40 degrees. 
     
     
         5 . The pick of  claim 1  where the inserts are made of one or more material selected from the material group comprising carbide, steel, diamond and ceramic. 
     
     
         6 . The pick of  claim 1  where the hardness of at least one of the inserts is different than the hardness of the other inserts. 
     
     
         7 . The pick of  claim 1  where the head receives three inserts. 
     
     
         8 . The pick of  claim 1  where the head receives four inserts. 
     
     
         9 . The pick assembly of  claim 1  where the holes are all parallel viewed from a first perspective and the angle between two of the holes is between 5 and 40 degrees viewed from a perspective orthogonal to the first perspective. 
     
     
         10 . The pick of  claim 1  where the pick includes a shank to be received in an opening of a tool holder secured to the roll. 
     
     
         11 . The pick of  claim 10  where the pick includes a shoulder proximate to the shank that abuts the tool holder on fully receiving the shank in the opening. 
     
     
         12 . The pick of  claim 10  where the holes extend 30-50 millimeters. 
     
     
         13 . A pick assembly to be used on a rotating drum to separate a consolidated material comprising:
 a pick including a head with a strike face;   holes that open at the strike face;   a holder mounted on the drum to receive the pick; and   a plurality of inserts received in the holes.   
     
     
         14 . The pick assembly of  claim 13  where the head includes a longitudinal axis inclined at an angle between the direction of rotation of the drum and a radial of the drum and the inserts at the face are equidistant from the longitudinal axis 
     
     
         15 . The pick assembly of  claim 13  where the inserts comprise one material selected from the group of cemented carbide, steel, diamond and ceramic. 
     
     
         16 . The pick assembly of  claim 13  where the holes are parallel to each other. 
     
     
         17 . The pick assembly of  claim 13  where the holes converge toward the strike face. 
     
     
         18 . The pick assembly of  claim 13  where at least one of the holes is inclined from at least one other hole at an angle between 5 and 40 degrees. 
     
     
         19 . The pick assembly of  claim 13  where the inserts are parallel to each other when viewed from a first perspective and the angle between a first hole and a second hole is between 5 and 40 degrees viewed from a perspective orthogonal to the first perspective.