초록 ▼

An L-shaped roller chime is provided adjacent each end of a closed head drum. The drum is formed of a thermoplastic material and is blown into shape in an openable mold so that the drum has axially extending dividing seams. Each L-shaped chime has a first leg extending outwardly from the drum and a

An L-shaped roller chime is provided adjacent each end of a closed head drum. The drum is formed of a thermoplastic material and is blown into shape in an openable mold so that the drum has axially extending dividing seams. Each L-shaped chime has a first leg extending outwardly from the drum and a second leg extending generally perpendicularly to the first leg and in the axial direction of the drum. The depth of the groove formed by the first and second legs and the outer drum surface is uniform, however, the thickness of the first leg varies from a maximum at the dividing seams to a minimum intermediate the seams.

대표청구항 ▼

A closed head drum formed of a thermoplastic material parison blown within a mold openable horizontally along a vertical plane and comprising: (a) a head end; (b) a bottom end spaced from said head end; (c) a side wall formed integrally with and extending between said head and bottom ends, said said

A closed head drum formed of a thermoplastic material parison blown within a mold openable horizontally along a vertical plane and comprising: (a) a head end; (b) a bottom end spaced from said head end; (c) a side wall formed integrally with and extending between said head and bottom ends, said said wall forming the lateral closure of the drum and having an increased wall thickness on diametrically opposite sides thereof; and (d) at least one roller chime formed integrally with and extending circumferentially around said side wall, said roller chime being L-shaped and comprising: (1) a first leg extending radially outwardly from said side wall, (2) a second leg extending from and transversely of the radially outer end of said first leg so that said second leg extends generally in the same direction as said side wall, (3) said second leg being spaced radially outwardly from the outer surface of said side wall and forming, in combination with said side wall and said first leg, an annular recess extending circumferentially around the drum, and (4) a portion of said chime having a variable thickness with the maximum thickness of said portion being located at said diametrically opposite sides and the minimum thickness thereof located between said diametrically opposite sides.