초록 ▼

A method and apparatus for forming a drum handling ring having an inverted frustoconical geometry to facilitate engagement of a conventional parrot beak gripper with the ring. The end of an advancing, straight strip of heated thermoplastic material, continuously provided by an extrusion head, is fed

A method and apparatus for forming a drum handling ring having an inverted frustoconical geometry to facilitate engagement of a conventional parrot beak gripper with the ring. The end of an advancing, straight strip of heated thermoplastic material, continuously provided by an extrusion head, is fed at a first location to the circular periphery of a continuously rotating, large diameter turntable where the strip is clamped thereto and then cooled so that the clamped portion of the strip thermally sets into an arcuate shape corresponding to the periphery of the turntable. At a second location diametrically opposed to the first, the now arcuate end portion of the strip is unclamped and guided away from the turntable periphery to a cutting station where the continuously advancing strip is cut into arcuate pieces each having an arc length generally corresponding to the desired circumference of a drum handling ring. In a separate operation, the ends of each arcuate piece are butted together and then thermally welded to provide an inverted frustoconical drum handling ring having a grippable “toe”portion spaced radially outwardly from the sidewall of the associated drum to facilitate gripping thereof.

대표청구항 ▼

A method of forming a ring from a strip of plastic material comprising the steps of: providing said strip in a non-solidified condition, said strip being curved to a predetermined degree out of a secondary plane B－B generally perpendicular to a primary plane A－A; solidifying said curved strip to a p

A method of forming a ring from a strip of plastic material comprising the steps of: providing said strip in a non-solidified condition, said strip being curved to a predetermined degree out of a secondary plane B－B generally perpendicular to a primary plane A－A; solidifying said curved strip to a predetermined degree wherein it will maintain its curved condition; and bending said solidified, curved strip out of said primary plane A－A to form a ring having a geometry dependent on the degree of curvature of said strip out of said secondary plane B－B.