Gasketless Closure For Open-Top Pails

A closure for a pail having a sidewall ending in an outwardly protruding top rim having a substantially flat top surface and a substantially flat undersurface wherein said closure comprises:

• a molded plastic body having a center deck and an integral annular peripheral channel portion with radially spaced apart inner and outer annular walls defining an inverted annular U-shaped channel having an interior inner top and outer surfaces for lockingly receiving said top rim and a portion of said sidewall therein;
• said outer wall having an annular ledge to lockingly abut the under surface of said outwardly protruding annular rim when the pail rim is inserted into said annular channel;
• said interior inner surface having annular sealed ridges formed thereon to lie sealingly against an inner sidewall surface of said pail to form a first seal;
• and
• a sealing wiper appendage integrally depending from the interior top wall of said inverted U-shaped channel and angled downwardly and inwardly toward said interior inner surface so as to deformingly contact the top surface of said outwardly protruding rim when said rim is inserted into said channel to form a second seal with said container.