초록 ▼

A plastic blow molded drum has unique top and bottom structure providing protection and strength for the drum and attachments. An integrally formed top structure with a sufficiently deep recess provides protection for drum inserts and associated closures. Additionally, the bottom structure includes

A plastic blow molded drum has unique top and bottom structure providing protection and strength for the drum and attachments. An integrally formed top structure with a sufficiently deep recess provides protection for drum inserts and associated closures. Additionally, the bottom structure includes a sump and structural member formed by the pinched-off parisan during the blow molding process. The drum has a top wall, a cylindrical side wall, and a bottom wall defining an open interior. The top wall has an access port comprising a fitting integrally formed with the drum. The fitting having an upwardly extending neck with inside threads and a top shoulder. A drum insert is engaged with the fitting and provides an additional second threaded fitting and a second shoulder both extending upwardly above the shoulder of the integral fitting. A closure comprising a plug portion and a threaded nut portion engages the second threaded fitting, closes the port, and extends above the second shoulder. The closure has an uppermost portion, which may be a protective cover or venting valve handle. The protective recess may suitably be formed by the chime and/or further downward recessed portions of the top wall such that the first fitting, the second fitting, and the closure, including the uppermost portion of the closure are all below the top edge of the chime.

대표청구항 ▼

[ We claim:] [1.] A combination plastic molded drum, drum insert, and closure, the plastic molded drum comprising a cylindrical wall, a top structure, and a bottom structure: the top structure, the cylindrical wall, and the bottom structure all integrally molded;the top structure comprising a top wa

[ We claim:] [1.] A combination plastic molded drum, drum insert, and closure, the plastic molded drum comprising a cylindrical wall, a top structure, and a bottom structure: the top structure, the cylindrical wall, and the bottom structure all integrally molded;the top structure comprising a top wall and a chime having a top edge extending circumferentially around, upwardly, and radially outward with respect to said top wall, the top wall comprising an integrally molded recessed portion, the top structure further comprising an upwardly extending first fitting integrally molded with the recessed portion, the first fitting having a first neck portion with a threaded portion and a first shoulder,the drum insert comprising a base portion, an integral second fitting portion, and a downhole tube portion, the base portion sized for threadably engaging the first neck portion, the second fitting comprising a second threaded neck portion and a shoulder portion, the second fitting positioned above the base portion such that when the drum insert is assembled with the first fitting the second fitting is above the first fitting,the closure comprising a plug portion and a handle, the plug portion sized to sealingly plug into the second fitting, handle extending circumferentially around the plug portion and rotatably secured thereto, the handle threadably engageable with the second fitting to secure the closure in place on the drum insert,the recessed portion positioned such that the first fitting, the drum insert, and the closure do not extend above the top edge of the chime.