Assemblies of teeth of earth moving machines

Abstract

The improvements provide for the lugs of the tooth to have stepped guides at the top and bottom which combine with widened end regions for greater reinforcement and with a projecting internal abutment in at least one of said lugs, capable of being-guided in a corresponding straight guide of the tooth holder, being arranged, after it is mounted, so as to retain the pin from behind, which pin is arranged in a pin seating arranged generally vertically in the body of the tooth holder, with a gently curved and inclined structure.

1 . A coupling for a tooth of earth-moving machines, comprising projecting lugs on the tooth configured to couple with matching seatings of a tooth holder and a transverse seating for a pin, the lugs of the tooth longitudinally have stepped guides on upper and lower edges of the lugs and which continue in an area of attack in widened abutment regions to obtain greater reinforcement, combined with matching profiles of said stepped guides and widened regions in a body of the tooth holder and with an internal projecting abutment arranged in at least one of said lugs, configured to be guided in an internal part of a corresponding straight guide of the tooth holder, said abutment, after mounting of the tooth in the tooth holder, arranged to retain the pin, the pin disposed in a pin seating provided in a generally vertical arrangement in the body of the tooth holder.  
     
     
         2 . The coupling according to  claim 1 , wherein the widened abutment regions have a curved shape.  
     
     
         3 . The coupling according to  claim 1 , wherein the widened abutment regions are in a shape of an inclined plane.  
     
     
         4 . The coupling according to  claim 1 , wherein the widened regions are in a shape of a straight step.  
     
     
         5 - 6 . (canceled).  
     
     
         7 . The coupling according to  claim 1 , wherein the lugs of the tooth have transversely a flat or curved shape.  
     
     
         8 . The coupling according to  claim 1 , wherein the straight guide of the tooth holder is formed on a nose of the tooth holder for the internal abutment of the lugs of the tooth, and extend for a length shorter than a total length of said nose of the tooth holder, in order to obtain greater mechanical strength.  
     
     
         9 . The coupling according to  claim 1 , wherein the straight guide of the tooth holder is formed on a nose of the tooth holder for the internal abutment or abutments of the lugs of the tooth and extend as far as a rear end of said nose with its open end.  
     
     
         10 . The coupling according to  claim 1 , comprising an arrangement of an inlet chamfer in an opening for introduction of the pin, in order to improve mounting and disassembly of the pin.  
     
     
         11 . (canceled).