Method of manufacturing improved protective headgear
OwnerNoel Dalyinventor
Life of this patent
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Abstract
A method is disclosed for producing a protective helmet, the method comprising placing an inner shell having a dome portion and downwardly extending side portions on a die, positioning a further die so that a cavity is provided between the outer surface of the inner shell and the further die, filling the cavity with pre-foamed beads of polystyrene of selected density, and applying heat to expand the beads to create a continuous layer of shock absorbing material extending over the whole outer surface of the inner shell. Additionally, and subsequent to the formation of the layer of shock absorbing material, an outer covering may be applied to the outer surface of the shock absorbing material to provide a double-skin helmet.
Claims7
A method of producing a protective helmet comprising placing an inner shell having a dome portion and downwardly extending side portions on a die, positioning a further die so that a cavity is provided between the outer surface of the inner shell and the further die, filling the cavity with prefoamed beads of polystyrene of selected density, applying direct steam heat to said beads to expand said beads and create a continuous homogeneous layer of shock absorbing material extending over the whole outer surface of the inner shell and physically adhered to it, and removing the inner shell with the adhered layer of shock absorbing material from said die and said further die.
Dependencies are inferred from the claim text.