Plastic container finish with structural rib

Abstract

A plastic container includes a base, a body, a shoulder and a neck having a finish. The neck includes an inwardly-projecting annular rib between the shoulder and the finish to increase the strength of the finish.

1 . A finish of a plastic container comprising: 
 an annular rib adapted to increase the rigidity of said finish, said annular rib projecting radially inward on an internal surface of the container and further forming a circumferential groove on an outer surface of the container.    
   
   
       2 . The finish according to  claim 1 , wherein said finish is formed by blow molding.  
   
   
       3 . The finish according to  claim 1 , wherein said finish further comprises threads adapted to mate with a threaded closure.  
   
   
       4 . A plastic container comprising: 
 a body having a longitudinal axis;    a shoulder, said shoulder connected at a first end of said body;    a base, said base connected at a second end of said body;    a neck extending axially away from said body comprising a finish; and 
 an annular rib connecting said finish to said shoulder,  
   wherein said annular rib increases the rigidity of said finish.    
   
   
       5 . The container according to  claim 4 , wherein said annular rib projects radially inward on an internal surface of the container.  
   
   
       6 . The container according to  claim 5 , wherein said annular rib concurrently forms a circumferential groove on an external surface of the container.  
   
   
       7 . The container according to  claim 4 , wherein said finish further comprises threads adapted to mate with a threaded closure.  
   
   
       8 . The container according to  claim 4 , wherein said finish has an outside diameter of approximately 83 mm.  
   
   
       9 . The container according to  claim 4 , wherein said plastic container is formed by blow molding.  
   
   
       10 . The container according to  claim 4 , wherein said finish is formed by blow molding.  
   
   
       11 . The container according to  claim 4 , wherein said container has a cylindrical cross-section.  
   
   
       12 . A plastic container comprising; 
 a body having a first body end and a second body end;    a shoulder having a first shoulder end and a second shoulder end;    a base connected to said body at said first body end and said first shoulder end connected to said second body end;    a neck connected to said second shoulder end;    said shoulder extending axially and radially inward between said first and second shoulder ends in a direction away from said body;    said neck further comprising a finish and an annular rib connecting said finish to said second shoulder end to provide increased rigidity in said neck.    
   
   
       13 . The container according to  claim 12 , wherein said annular rib projects radially inward on an internal surface of the container.  
   
   
       14 . The container according to  claim 13 , wherein said annular rib concurrently forms a circumferential groove on an external surface of the container.  
   
   
       15 . The container according to  claim 12 , wherein said finish further comprises threads adapted to mate with a threaded closure.  
   
   
       16 . The container according to  claim 12 , wherein said container is formed by blow molding.  
   
   
       17 . The container according to  claim 12 , wherein said finish is formed by blow molding.  
   
   
       18 . The container according to  claim 12 , wherein said finish is approximately 83 mm in diameter.  
   
   
       19 . The container according to  claim 12 , wherein said container has a cylindrical cross-section.