Method of producing a protective helmet
AssigneeDusseldorfer Lackgrosshandlung Otto Hartung GmbH
InventorHelmut Hartung
Life of this patent
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Abstract
In a method of producing a protective helmet the steps include applying a first layer of hardenable synthetic resin and fibrous tissue on a predetermined surface of a positive-type mold, thereafter tensioning the fibrous tissue, and subsequently repeating the layer-applying and tensioning steps a prearranged number of times, so as to obtain successive layers forming the protective helmet.
Claims5
In a method free from heat and fluid pressures of producing a protective helmet of substantially uniform thickness with the aid of a positive-type mold having a surface region of predetermined dimensions, the steps comprising:
- applying a first layer of hardenable synthetic resin and shortly thereafter a first single-piece fibrous tissue having an continuous surface area of prearranged dimensions corresponding at least to said surface region of predetermined dimensions on said surface region of said positive-type mold, so as to leave laterally overhanging tissue ends,
- thereafter pulling said laterally overhanging ends so as to tension said fibrous tissue, until said surface region is uniformly covered up to at least a predefined longitudinal region, said tensioning step being free from exerting any significant force on said mold, and
- subsequently repeating the layer-applying and tensioning steps a prearranged number of times, so as to obtain successive layers forming said protective helmet.
Dependencies are inferred from the claim text.