초록 ▼

A method and apparatus are described for forming a closure device having a cylindrical plug and a cylindrical collar extending coextensively and coaxially from a cap. The apparatus includes an outer mold defining an injection mold cavity. A cylindrical hollow outer core extends into the injection mo

A method and apparatus are described for forming a closure device having a cylindrical plug and a cylindrical collar extending coextensively and coaxially from a cap. The apparatus includes an outer mold defining an injection mold cavity. A cylindrical hollow outer core extends into the injection mold cavity and a cylindrical inner core extends into the injection mold cavity within the hollow outer core. Pushing means separate the molded part from the inner core. A stripper separates the part from the outer core by engaging an annular shoulder on the part. The part is pushed free of the mold\s inner core after the outer mold is removed but before the stripper is advanced to engage the annular shoulder.

대표청구항 ▼

A method for forming a closure device having a cap portion; a cylindrical plug portion extending therefrom; a cylindrical collar extending substantially coextensively and coaxially with said plug portion spaced therefrom to provide an annular cavity for receiving the open end of a container to be cl

A method for forming a closure device having a cap portion; a cylindrical plug portion extending therefrom; a cylindrical collar extending substantially coextensively and coaxially with said plug portion spaced therefrom to provide an annular cavity for receiving the open end of a container to be closed, said collar having an annular shoulder thereon; and an intercoupling section comprised of at least one tether strip that is secured at its respective ends to said cap and said collar, said tether strip being joined to said cap and said collar along a preselected length of said tether strip by frangible webs of a preselected thickness to permit said tether strip to be separated from said cap and plug and said collar along said preselected length, said method comprising: providing injection outer mold means enclosing an injection mold cavity for defining the outer surface of said closure device, providing substantially cylindrical hollow outer core means extending into said injection mold cavity and defining said annular cavity in said closure device including the inner surface of said cylindrical collar and the outer surface of said plug portion, providing substantially cylindrical inner core means extending into said injection mold cavity and defining an inner cylindrical cavity in said hollow cylindrical plug portion, providing stripper means for separating the molded closure device from the mold\s outer core means, injecting moldable material into said injection mold cavity, providing pushing means for separating said molded closure device from said inner core, removing said outer mold means that define the outer surfaces of said closure device, advancing said stripper means so it engages said annular shoulder on said closure device\s collar and pushes against it until the molded closure device is separated from said outer core and pushing said molded closure device forward until said device is free from the mold\s inner core, said pushing to occur after the mold means that define the outer surfaces of the closure device are removed, but before the stripper means are advanced so as to engage the annular shoulder on the closure device\s collar.