Safety helmet with a shell injected from thermoplastics and method for the manufacture of said helmet
AssigneeG.P.A. International
InventorJean Gessalin
Life of this patent
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Abstract
The invention relates to a safety helmet having an injected thermoplastics shell, and the method for manufacturing the same. The helmet shell is of composite structure and includes a rigid insert of reinforced resin and an outer casing of injected thermoplastics molded onto the insert which is embedded within the mass of said outer casing and is prestressed by shoulders 5 and 6 provided on overlapping portions 3 and 4 of casing 2, after cooling of the same.
Claims6
A safety helmet, especially for a vehicle rider, including a shell having an injected thermoplastics outer casing provided internally with a rigid insert of high strength reinforced resin having the shape of the shell itself, said insert being surrounded by the injected mass of said outer casing and prestressed by a hooping effect exerted by said casing.
A method for manufacturing a helmet including a shell having an injected thermoplastics outer casing provided internally with a rigid insert of reinforced resin, including the steps of
- premanufacturing a rigid insert of high strength reinforced resin,
- providing an injection mold having a male member and a female member defining a cavity having the shape of the shell,
- closely applying said insert onto the male member of said injection mold,
- disposing in a manner known per se said male member covered with said insert in said female member so as to provide between the internal surface of female member and said insert a gap having a substantially constant thickness,
- injecting said thermoplastics into said gap so as to fill the same and to mold said resin directly onto said insert, and
- removing the assembly from said mold subsequent to cooling of thermoplastics,
- whereby said insert is prestressed by the thermoplastics casing formed around said rigid insert.
Dependencies are inferred from the claim text.