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US 4,054,637 AGranted
Process for manufacturing plastic cartridge cases
OwnerEric Gruazinventor
Life of this patent
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Abstract
A method for manufacturing a plastic cartridge case having a hollow peripheral flange which protrudes radially from the base of the cartridge case, utilizes the principle of heating a plastic tubular element closed at the base and exerting axial pressure against a housing which acts as a mold and limits the deformation of the element.
Claims5
A process for manufacturing a plastic cartridge case having a hollow peripheral flange which protrudes radially from the base of the cartridge case, comprising:
- heating at least the bottom of a tubular element of plastic closed at the base by a bottom, to a temperature at which the plastic is softened but not melted, and
- exerting a controlled axial pressure on the cylindrical part of the element, during said heating step, against a housing which acts as a mold which laterally supports the cylindrical part of the element and limits the deformation of the element, said pressure being so controlled and said housing being so shaped as to permit the formation of said hollow peripheral radially protruding flange.
Dependencies are inferred from the claim text.