Coupling system for the teeth of an excavator

Abstract

This engagement system for digger teeth, in particular a tooth from which there extend in the axial direction two rectilinear lugs which, being noticeably parallel to one another, emerge cantilevered from the mouth of a central housing and complement respective rectilinear, open recesses which are provided, also in the axial direction, on an adapter member, consisting in that the straight section of each of the rectilinear lugs of the tooth member, which is concave in one part and substantially complements the convex profile of the back of the rectilinear recesses of the adapter, has two end sections which meet in a convergent fashion on an intermediate section differentiated from the afore-mentioned sections and impinge thereon at a angle of between approximately 10° and 40°.

1 . An engagement system for digger teeth, in particular for the teeth of the type formed by the association of an adapter member, fixed to the bucket or shovel of the digger, and a tooth member, coupled to the former and retained thereon by means of a pin, in which one of said members, preferably the tooth member, extends in the axial direction in two rectilinear lugs which, being noticeably parallel to one another, emerge cantilevered from the mouth of a central housing, and complement respective rectilinear, open recesses arranged, also in the axial direction, on the adapter member, which, at the same time, is provided with a cantilever projection that complements the central housing in the tooth member, said tooth member lugs having their inner surface, which is in contact with the back of the adapter member recesses, as a flat or slightly arched curvilinear surface, wherein the straight section of each of the rectilinear lugs of the tooth member, which is concave in one part and substantially complements the convex profile of the back of the rectilinear recesses of the adapter, has two end sections which meet in a convergent fashion on an intermediate section differentiated from the afore-mentioned sections.  
     
     
         2 . The system, according to the preceding claim, wherein the two end sections of the straight section of the tooth member lugs, impinge on the differentiated intermediate section, at an angle of between approximately 10° and 40°.  
     
     
         3 . The system, according to  claim 1 , wherein the differentiated intermediate section of the straight section of the tooth member lugs is curvilinear.  
     
     
         4 . The system, according to  claim 1 , wherein the differentiated intermediate section of the straight section of the tooth member lugs is rectilinear.  
     
     
         5 . The system, according to  claim 1 , wherein the end sections of the straight section of each of the tooth member lugs are noticeably rectilinear.  
     
     
         6 . The system, according to  claim 1 , wherein the end sections of the straight section of each of the tooth member lugs are slightly curvilinear.  
     
     
         7 . The system, according to  claim 1 , wherein one of the end sections of the straight section of each of the tooth member lugs is noticeably rectilinear, whereas the other remaining end section is slightly curvilinear.  
     
     
         8 . The system, according to  claim 1 , wherein the straight section of the tooth member lugs is transversally symmetrical, whereby the two end sections of said straight section of the tooth member lugs are the same length and the angle of incidence of the two end sections on the intermediate section is the same value for each of them.  
     
     
         9 . The system, according to  claim 1 , wherein the straight section of the tooth member lugs is asymmetrical in a transverse direction, whereby the two end sections of said straight section of the tooth member lugs are a different length and the angle of incidence of the two end sections on the differentiated intermediate section is a different value for each of them.  
     
     
         10 . The system, according to  claim 1 , wherein the straight section of the tooth member lugs, being asymmetrical, has the two end sections of the same length and different angle of incidence on the differentiated intermediate section.  
     
     
         11 . The system, according to  claim 1 , wherein the straight section of the tooth member lugs, being asymmetrical, has the two end sections of different length and equal angle of incidence on the differentiated intermediate section.  
     
     
         12 . The system, according to  claim 1 , wherein both lugs of the tooth member have diametrically opposite orifices which, being positioned in one of the end sections or in the differentiated intermediate section, are aligned in registration with an orifice which is traversed by the cantilever projection of the adapter member.  
     
     
         13 . The system, according to  claim 1 , wherein the two smaller sides of the straight section of the lugs of the tooth member are rectilinear and noticeably parallel to one another.  
     
     
         14 . The system, according to  claim 1 , wherein the straight sections of the two lugs of a tooth member are specularly symmetrical.  
     
     
         15 . The system, according to  claim 1 , wherein the straight sections of the two lugs of a tooth member are symmetrical with respect to one point.  
     
     
         16 . The system, according to  claim 1 , wherein the straight section of each lug of the tooth member has an equal width along its whole extension.  
     
     
         17 . The system, according to  claim 1 , wherein the straight section of each lug of the tooth member has one or more areas of reduced extension and a different width from the prevailing width.  
     
     
         18 . The system, according to claims  9  and  11 , wherein in the lugs of the tooth member the longer end sections are facing the direction of the stresses to be withstood.