Two piece screw cap closure

Abstract

A closure for attachment to a cover having an opening presenting an upstanding rim, comprising a body having an annular top wall, said top wall merging with spaced inner and outer walls defining a depending body recess for capturing said rim, said outer wall having threads extending generally outwardly therefrom and the top wall presenting a notch; a cap having a top, said top presenting a projection disposed for alignment with said notch, an outer wall depending from said top, said outer wall having threads for engagement with the threads of said body outer wall.

1 . A closure ( 4 ) for attachment to a cover ( 1 ) having an opening presenting an upstanding rim ( 3 ) comprising: 
 (a) a body ( 5 ) having an annular recess ( 14 ,  15 ) formed between a spaced inner ( 18 ) and outer ( 11 ) annular wall, said recess ( 14 ,  15 ) adapted to capture said rim ( 3 ), said annular outer wall ( 11 ) having threads ( 12 ) extending generally outwardly therefrom;    (b) a cap ( 16 ) having a top wall ( 17 ), said top wall ( 17 ) presenting an outer wall ( 20 ) depending from said top wall ( 17 ), said cap outer wall ( 20 ) having threads ( 21 ) for engagement with said threads ( 12 ) of said body outer wall ( 11 );    (c) said rim ( 3 ), body ( 5 ) and cap ( 16 ) co-axially disposed about an axis ( 27 );    characterized in that:    (d) said threads ( 12 ) of said body outer wall ( 11 ) and said threads ( 21 ) of said cap outer wall ( 20 ) are both disposed at and below a horizontal plane defined by said rim ( 3 ).    
     
     
         2 . A closure ( 4 ) as claimed in  claim 1  wherein said body ( 5 ) presents only two annular walls comprising: 
 (a) said inner annular wall ( 8 );    (b) said outer annular wall ( 11 ).    
     
     
         3 . A closure ( 4 ) as claimed in  claim 1  wherein said body ( 5 ) is voidless.  
     
     
         4 . A closure ( 4 ) as claimed in  claim 1  wherein: 
 (a) said body ( 5 ) has a top wall ( 10 ) presenting a notch ( 22 );    (b) said cap presents a projection ( 18 ) disposed for alignment with said notch ( 22 );    and wherein said rim ( 3 ), notch ( 22 ) and projection ( 18 ) are radially aligned.    
     
     
         5 . A closure as claimed in  claim 4  wherein said body top wall ( 10 ) contacts said rim ( 3 ) and said cap top ( 7 ) wall contacts said body top wall ( 10 ).  
     
     
         6 . A closure ( 4 ) as claimed in  claim 5  wherein said body threads ( 12 ) have a relatively wide lower face ( 25   a ), and said cap threads ( 21 ) have a relatively wide upper face ( 25   b ) for secure engagement between said cap ( 16 ) and body ( 25 ).  
     
     
         7 . A closure ( 4 ) as claimed in  claim 6  wherein said body outer wall threads ( 12 ) move radially annularly outwardly relative said cap threads ( 21 ) when said beaded rim ( 3 ) is pressed through said annular recess ( 14 ,  15 ).  
     
     
         8 . A closure ( 4 ) as claimed in  claim 7  wherein said notch ( 22 ) comprises an annular tapered notch adapted for sealing engagement with said cap projection ( 18 ) for maintaining sealing engagement.  
     
     
         9 . A closure ( 4 ) as claimed in  claim 8  wherein said body ( 5 ) comprises low density polyethylene and said cap comprises high density polyethylene.  
     
     
         10 . A closure ( 4 ) as claimed in  claim 8  wherein said lower face ( 25   a ) and said upper face ( 25   b ) are radially disposed and said body threads ( 12 ) are spaced from said cap outer wall ( 20 ).  
     
     
         11 . A closure ( 4 ) as claimed in  claim 10  wherein said threads  12  and  21  are not disposed above the horizontal plane defined by said rim ( 3 ).