Snap on closure

Abstract

A plastic pail lid opening surrounded by an upstanding closure receiving cylindrical neck is modified to incorporate a shorter outer cylindrical collar surrounding the neck. A closure assembly made up of an internally threaded closure fitment and a hand applied plug is affixed to the opening neck. The threaded opening is surrounded by an integrally molded sealing channel having an axially extending inner wall and a peripheral interlocking outer wall. To secure the closure assembly to the pail opening the inner wall is guided within the opening neck while the outer wall is axially forced between the outer surface of the upstanding neck and the inner diameter of the surrounding cylindrical collar. With the sealing channel outer wall interlockingly squeezed between the opening neck and surrounding collar, a liquid tight tamper resistant connection is formed.

I claim:  
     
         1 . In combination, a container wall having a closure receiving opening therein, said opening surrounded by a closure receiving structure, a threaded dispensing closure assembly interlockingly engaging said closure receiving structure, said interlocking engagement exerting a mechanical couple force between said closure and said structure whereby a substantial degree of torque resistance is created between said closure and said container wall.  
     
     
         2 . A combination as in  claim 1  and said closure receiving structure including an axially extending neck.  
     
     
         3 . A combination as in  claim 2  and said closure receiving structure including rigid means disposed externally of said neck.  
     
     
         4 . Dispensing closure fitment molded of synthetic plastic resin having a centrally disposed pour opening, an annular sealing channel surrounding said pour opening, said sealing channel configured to effect a self supported sealing engagement with a container wall opening, a cylindrical closure member engaging said pour opening, said closure member including a circumferentially enlarged flange extending radially outwardly so as to overlie said sealing channel and annular axially extending sealing means interposed said flange and said sealing channel whereby a compressive force therebetween causes a deformation of said sealing means.  
     
     
         5 . An all plastic closure as in  claim 4  wherein said deformation limits axial displacement of said flange relative to said sealing channel.  
     
     
         6 . An all plastic closure as in  claim 4  said flange and said sealing channel presenting interacting opposing annular sealing surfaces.  
     
     
         7 . An all plastic closure as in  claim 4  wherein said cylindrical closure member is molded from a higher density plastic resin than said closure fitment.  
     
     
         8 . An all plastic dispensing closure fitment having a centrally disposed pour opening, an annular sealing channel surrounding said pour opening, said sealing channel configured to effect a self supported torque resistant sealing engagement with a container wall opening, a threaded closure member engaging said pour opening, said closure member including a torque applying surface disposed radially outwardly of said sealing channel whereby a sealing torque is readily applied to said closure member and resisted by said sealing channel.  
     
     
         9 . An all plastic dispensing closure as in  claim 7  wherein said torque resisting surface is a circumferentially enlarged flange overlying said sealing channel.  
     
     
         10 . An all plastic dispensing closure as in  claim 8  and axially extending ribs disposed about the periphery of said flange.