Excavator teeth

Abstract

An excavator tooth system having a mounting nose having a projecting spigot and a wear member ( 12 ) having at one end a socket ( 18 ), the socket ( 18 ) being defined by spaced side walls and upper and lower walls converging from a rearwardly facing socket opening to a forward end of the socket. Each of the upper and lower walls comprises a forward bearing face ( 8 a ) and a rear bearing face ( 7 a ) separated by a forwardly convergent intermediate face. The front and rear bearing faces ( 8 a, 7 a ) are substantially parallel to a longitudinal axis ( 50 ) of the wear member and engage corresponding bearing faces ( 8,7 ) in said spigot.

1 . An excavator tooth system comprising: 
 a mounting nose having a projecting spigot; and,    a wear member having at one end thereof a socket, said socket being defined by spaced side walls and upper and lower walls converging from a rearwardly facing socket opening to a forward end of said socket, each of said upper and lower walls respectively comprising a planar front socket bearing face and a planar rear socket bearing face separated by a forwardly convergent intermediate face, said front and rear socket bearing faces being substantially parallel to a longitudinal axis of said wear member, said mounting nose having complementary planar front and rear spigot bearing faces on upper and lower surfaces thereof, said front and rear spigot bearing faces being substantially parallel to a longitudinal axis of said mounting nose and, in use, snugly engaging with said front and rear socket bearing faces when said wear member is located on said mounting nose.    
   
   
       2 . A system as claimed in  claim 1  wherein 
 said forward end of said socket forms an end bearing face.    
   
   
       3 . A system as claimed in  claim 2  wherein said end bearing face extends transversely of said longitudinal axis.  
   
   
       4 . A system as claimed in  claim 1  wherein the wear member comprises an adaptor having a front end adapted for releasable attachment thereto of a digging point.  
   
   
       5 . A system as claimed in  claim 1  wherein said wear member includes an aperture in at least one wall of said socket.  
   
   
       6 . A system as claimed in  claim 1  wherein said wear member includes aligned apertures on opposite walls of said socket.  
   
   
       7 . A system as claimed in  claim 6  wherein said aligned apertures extend through opposite side walls of said socket.  
   
   
       8 . A system as claimed in  claim 1  wherein at least portion of said rear bearing face is of a width greater than said forward bearing face.  
   
   
       9 . A system as claimed in  claim 1  wherein at least portion of said rear bearing face is of a substantially a similar width to said forward bearing face.  
   
   
       10 . A system as claimed in  claim 1  wherein said rear bearing face is of an area greater than said forward bearing face.  
   
   
       11 . A system as claimed in  claim 1  wherein said socket opening has a transverse width greater than the width of the forward end of said socket.  
   
   
       12 . A system as claimed in  claim 1  wherein the side walls of said socket taper convergently towards said forward end of said socket.  
   
   
       13 . A system as claimed in  claim 12  wherein said side walls taper convergently at an angle of from 8° to 11° relative to said longitudinal axis of said wear member.  
   
   
       14 . A system as claimed in  claim 13  wherein said side walls taper convergently at an angel of about 11°.  
   
   
       15 . An excavation device having an excavator tooth system according to  claim 1 .  
   
   
       16 . An excavation device as claimed in  claim 13  wherein said mounting nose is attached thereto.  
   
   
       17 . An excavation device as claimed in  claim 13  wherein said mounting nose is integrally formed therewith.