Cover assembly for a drum composed of synthetic resin

Claim 1

A drum, comprising: a drum body of thermoplastic synthetic resin material formed at an end of said body integrally with a neck set inwardly of said body and defining a mouth of said barrel, and a transition section between said neck and said body; a generally T-section connecting ring secured to said transition section below said mouth, said connecting ring having a pair of flanges forming a crossbar of the T of said T-section abutting said neck and a web projecting outwardly from said crossbar; a cover formed with an annular trough defined between inner and outer walls flanking said neck and tightly fitted over said neck and into said mouth, said cover being integrally provided with a cover bottom spanning said end of said body and recessed therein below said mouth, said outer wall being formed at a free end thereof with an outwardly extending shoulder generally parallel to and juxtaposed with said web, said outer wall in a region of said shoulder overlying one of said flanges extending toward said mouth; and a tensionable clamping ring of substantially U-section engaging over said web and said shoulder and clamping same upon tensioning of said clamping ring, said U-section being defined by a pair of flanks of said clamping ring, one of said flanks engaging said shoulder in said region and bearing inwardly upon said free end where said free end overlies said one of said flanges upon tensioning of said clamping ring, the other flank of said pair of flanks bearing inwardly upon the other of said flanges upon tensioning of said clamping ring.