Double rib overcap for a container with a removable membrane

Abstract

There is provided a double rib overcap for a container with a removable membrane. The skirt of the overcap includes a first inwardly projecting rib and a second inwardly projecting rib that are axially separated and includes inside surfaces of the skirt that are axially above each rib. The container has an opening that is encircled by a rim and the membrane covers the opening such that the membrane extends radially onto an outer surface of the rim. A first inside surface above the first rib of the overcap is dimensionally sized to create an interference-fit with the membrane and the rim when the overcap is connected to the container. Likewise, a second inside surface above the second rib of the overcap is dimensionally sized to create an interference-fit with the rim of the container when the overcap is connected to the container after the membrane has been removed.

1 . An interference-fit overcap, for engaging a radially outwardly protruding rim encircling a container opening having a removably attached membrane, comprising: 
 a top panel having a periphery;    a skirt extending from the periphery of the top panel to a distal end such that the skirt defines a first inside surface axially spaced from the top panel proximate the distal end of the skirt and defines a second inside surface axially positioned between the first inside surface and the top panel, wherein the first inside surface is diametrically dimensioned to produce an interference-fit with the membrane and rim and the second inside surface is diametrically dimensioned to produce an interference-fit with the rim alone;    a first rib projecting inwardly from the skirt and axially located between the first inside surface of the skirt and the distal end of the skirt; and    a second rib projecting inwardly from the skirt and axially located between the second inside surface and the first inside surface;    wherein the first rib engages beneath the rim of the container to resist detachment of the overcap when the membrane is attached and the second rib engages beneath the rim of the container to resist detachment of the overcap when the membrane is not attached.    
   
   
       2 . An interference-fit overcap according to  claim 1 , wherein the radially outwardly protruding rim encircling the container defines an outer surface and the membrane extends radially outward onto the outer surface of the rim.  
   
   
       3 . An interference-fit overcap according to  claim 1 , wherein the radially outwardly protruding rim encircling the container defines an outer surface and the membrane covers the container opening without extending radially outward onto the outer surface of the rim.  
   
   
       4 . An interference-fit overcap according to  claim 1 , wherein the first rib and the second rib each defines an uninterrupted circumferential rib.  
   
   
       5 . An interference-fit overcap according to  claim 1 , wherein the first rib and the second rib each defines a plurality of circumferentially spaced portions.  
   
   
       6 . An interference-fit overcap according to  claim 1 , wherein the skirt extends substantially perpendicular to the top panel of the overcap.  
   
   
       7 . An interference-fit overcap according to  claim 1 , wherein the first rib and the second rib of the overcap each define a rounded edge portion at a radially inward surface opposite the first inside surface and the second inside surface of the skirt.  
   
   
       8 . An interference-fit overcap according to  claim 7 , wherein the rounded edge portion of the first rib defines an inside diameter relatively larger than an inside diameter of the rounded edge portion of the second rib.  
   
   
       9 . An interference-fit overcap according to  claim 1 , wherein the overcap is a thermoplastic material.  
   
   
       10 . A container, comprising: 
 a container body formed by a wall, wherein the wall defines an opening encircled by a radially outwardly protruding rim;    a removably attached membrane substantially covering the opening while the membrane is attached; and    an interference-fit overcap, comprising: 
 a top panel having a periphery;  
 a skirt extending from the periphery of the top panel to a distal end such that the skirt defines a first inside surface axially spaced from the top panel proximate the distal end of the skirt and defines a second inside surface axially positioned between the first inside surface and the top panel, wherein the first inside surface is diametrically dimensioned to produce an interference-fit with the membrane and rim and the second inside surface is diametrically dimensioned to produce an interference-fit with the rim alone;  
 a first rib projecting inwardly from the skirt and axially located between the first inside surface of the skirt and the distal end of the skirt; and  
 a second rib projecting inwardly from the skirt and axially located between the second inside surface and the first inside surface;  
   wherein the first rib engages beneath the rim of the container to resist detachment of the overcap when the membrane is attached and the second rib engages beneath the rim of the container to resist detachment of the overcap when the membrane is not attached.    
   
   
       11 . A container according to  claim 10 , wherein the radially outwardly protruding rim encircling the container defines an outer surface and the membrane extends radially outward onto the outer surface of the rim.  
   
   
       12 . A container according to  claim 10 , wherein the radially outwardly protruding rim encircling the container defines an outer surface and the membrane covers the container opening without extending radially outward onto the outer surface of the rim.  
   
   
       13 . A container according to  claim 10 , wherein the outwardly protruding rim is an outwardly rolled bead.  
   
   
       14 . A container according to  claim 10 , wherein the first rib and the second rib each defines an uninterrupted circumferential rib.  
   
   
       15 . A container according to  claim 10 , wherein the first rib and the second rib each defines a plurality of circumferentially spaced portions.  
   
   
       16 . A container according to  claim 10 , wherein the skirt extends substantially perpendicular to the top panel of the overcap.  
   
   
       17 . A container according to  claim 10 , wherein the first rib and the second rib of the overcap each define a rounded edge portion at a radially inward surface opposite the first inside surface and second inside surface of the skirt.  
   
   
       18 . A container according to  claim 17 , wherein the rounded edge portion of the first rib defines an inside diameter relatively larger than an inside diameter of the rounded edge portion of the second rib.  
   
   
       19 . A container according to  claim 10 , wherein the membrane defines a thickness and the inside diameter of the first inside surface is approximately equivalent to a combined distance of the inside diameter of the second inside surface and twice the thickness of the membrane.  
   
   
       20 . A container according to  claim 10 , wherein the membrane is a metal foil.  
   
   
       21 . A container according to  claim 10 , wherein the overcap is a thermoplastic material.  
   
   
       22 . A sealable storage device, comprising: 
 a container, comprising: 
 a body formed by a wall,  
 an opening defined by the wall, and  
 an outwardly rolled bead encircling the opening of the container, wherein the bead protrudes generally outward from the wall and defines an outer surface;  
   a membrane removably attached to the bead such that the membrane substantially covers the opening and extends radially outward onto the outer surface of the bead while the membrane is attached; and    an interference-fit overcap, comprising: 
 a top panel having a periphery;  
 a skirt extending from the periphery of the top panel to a distal end such that the skirt defines a first inside surface axially spaced from the top panel proximate the distal end of the skirt and defines a second inside surface axially positioned between the first inside surface and the top panel, wherein the first inside surface is diametrically dimensioned to produce an interference-fit with the membrane and bead and the second inside surface is diametrically dimensioned to produce an interference-fit with the bead alone;  
 a first rib projecting inwardly from the skirt and axially located between the first inside surface of the skirt and the distal end of the skirt; and  
 a second rib projecting inwardly from the skirt and axially located between the second inside surface and the first inside surface;  
   wherein the first rib engages beneath the bead of the container to resist detachment of the overcap when the membrane is attached and the second rib engages beneath the bead of the container to resist detachment of the overcap when the membrane is not attached.