Method of making a helmet
AssigneeNP Aerospace Limited
InventorMartin Cheese
Life of this patent
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Abstract
A method of making a helmet comprises the steps of cutting a plurality of substantially rectangular, preferably square, blanks from a sheet of resin-impregnated fabric, making curved cuts (1) in each blank to form a crown portion (5) and lobe portions (3) therefrom, arranging a stack of said sheets into a helmet preform such that the lobe portions of any blank partially overlap adjacent lobe portions of the same blank, and molding the helmet from the preform.
Claims17
A method of making a helmet comprising the steps of cutting a plurality of substantially rectangular blanks from a sheet of fabric, making curved cuts in each blank to form a crown portion and lobe portions therefrom, arranging a stack of said sheets into a helmet preform by pushing the stack of blanks into a substantially hemispherical cavity so as to cause the lobe portions of each blank to partially overlap adjacent lobe portions of the same blank, and molding the helmet from the preform.
A helmet formed from a stack of fibrous blanks impregnated with resin, each blank comprising a trimmed rectangle and each blank having four curved cuts extending inwardly, one from each side of the rectangle.
Dependencies are inferred from the claim text.