Reduced thickness cover

Abstract

A unitary cover is used with a tubular container having an open end with a cylindrical connecting bead at the open end. The unitary cover comprises a central circular wall of a size corresponding to the container open end. A concentric ring region surrounds the central circular wall and defines a peripheral flange having a downwardly opening channel receivable on the cylindrical connecting bead to close the open end of the container. The peripheral flange has a substantially greater wall thickness than the central circular wall

1 . A unitary cover for use with a tubular container having an open end with a cylindrical connecting bead at the open end, the unitary cover comprising: 
 a central circular wall of a size corresponding to the container open end, a concentric ring region surrounding the central circular wall and defining a peripheral flange having a downwardly opening channel receivable on the cylindrical connecting bead to close the open end of the container, the peripheral flange having a substantially greater wall thickness than the central circular wall.    
   
   
       2 . The unitary cover of  claim 1  wherein the cover comprises a wall thickness nominally about 0.09 inches for the peripheral flange and a wall thickness nominally 0.06 inches for the central circular wall.  
   
   
       3 . The unitary cover of  claim 1  wherein the concentric ring region comprises first and second concentric rings disposed between the peripheral flange and the central circular wall to define a generally corrugated structure.  
   
   
       4 . The unitary cover of  claim 3  wherein wall thickness of the concentric ring region gradually decreases transitioning from the peripheral flange to the central circular wall.  
   
   
       5 . The unitary cover of  claim 1  wherein the peripheral flange has a wall thickness about 50% greater then wall thickness of the central circular wall.  
   
   
       6 . A unitary cover for use with a tubular container having an open end with a cylindrical connecting bead at the open end, the unitary cover comprising: 
 a central circular wall of a size corresponding to the container open end, a plurality of concentric rings surrounding the central circular wall and including a peripheral flange having a downwardly opening channel receivable on the cylindrical connecting bead to close the open end of the container, the peripheral flange having a substantially greater wall thickness than the central circular wall.    
   
   
       7 . The unitary cover of  claim 6  wherein the cover comprises a wall thickness nominally about 0.09 inches for the peripheral flange and a wall thickness nominally 0.06 inches for the central circular wall.  
   
   
       8 . The unitary cover of  claim 6  wherein the plurality of concentric rings comprises first and second concentric rings disposed between the peripheral flange and the central circular wall to define a generally corrugated structure.  
   
   
       9 . The unitary cover of  claim 8  wherein wall thickness of the concentric ring region gradually decreases transitioning from the peripheral flange to the central circular wall.  
   
   
       10 . The unitary cover of  claim 6  wherein the peripheral flange has a wall thickness about 50% greater then wall thickness of the central circular wall.  
   
   
       11 . The unitary cover of  claim 8  wherein the first concentric ring has a greater wall thickness than the central circular wall and the second concentric ring has a greater wall thickness than the first concentric ring and the peripheral flange has a greater wall thickness than the second concentric ring.  
   
   
       12 . The unitary cover of  claim 6  further comprising a pair of bung openings in the central circular wall.  
   
   
       13 . The unitary cover of  claim 6  wherein the peripheral flange has a diameter to be received on a tubular container having an, 18 inch, a 21½ inch or a 23 inch connecting bead.  
   
   
       14 . The unitary cover of  claim 6  wherein the cover comprises a unitary wall element of synthetic resin.  
   
   
       15 . A unitary cover for use with a tubular container having an open end with a cylindrical connecting bead at the open end, the unitary cover comprising: 
 a central circular wall of a size corresponding to the container open end, a series of concentric rings surrounding the central circular wall and defining a corrugated structure, an outermost ring comprising a peripheral flange having a downwardly opening channel receivable on the cylindrical connecting bead to close the open end of the container, the peripheral flange having a substantially greater wall thickness than the central circular wall.    
   
   
       16 . The unitary cover of  claim 15  wherein the cover comprises a wall thickness nominally about 0.09 inches for the peripheral flange and a wall thickness nominally 0.06 inches for the central circular wall.  
   
   
       17 . The unitary cover of  claim 15  wherein wall thickness of the series of concentric rings gradually decreases transitioning from the peripheral flange to the central circular wall.  
   
   
       18 . The unitary cover of  claim 15  wherein the peripheral flange has a wall thickness about 50% greater then wall thickness of the central circular wall.  
   
   
       19 . The unitary cover of  claim 15  wherein a first concentric ring has a greater wall thickness than the central circular wall and a second concentric ring has a greater wall thickness than the first concentric ring and the peripheral flange has a greater wall thickness than the second concentric ring.  
   
   
       20 . The unitary cover of  claim 15  wherein the cover comprises a unitary wall element of synthetic resin.