Title: Method of manufacturing improved protective headgear

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.

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Inventors: Daly, Noel (New Plymouth, NZ)

Application Number: 452397
Filing Date: 1974-03-18
Publication_date: 1976-01-27
Assignee:
Primary Class(es): 156/79 2/412, 156/250, 264/45.4, 264/51, 264/321, 428/319.3
Other Classes:
US Patent Ref:

2814043	Jan, 1957	Alesi	2/3.
2901750	Sep, 1959	McMurray	2/3.
3273162	Sep, 1966	Andrews	2/3.
3277220	Oct, 1966	Plymale et al.	264/45.
3344222	Sep, 1967	Shapiro et al.	156/79.
3465363	Sep, 1969	Raney	2/3.
3471866	Oct, 1969	Raney	2/3.
3624663	Nov, 1971	Jones	2/3.
3627162	Dec, 1971	Dossin	264/45.
3684633	Aug, 1972	Haase	161/161.
3691265	Sep, 1972	Cobbledick	161/161.

Other Refs: 670,8301,326,192

Sep, 1963	CA
Aug, 1973	UK

Primary Examiner: Whitby, Edward G.
Assistant Examiner:
Attorney: Holman & Stern