Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A protective helmet including: an outer shell which comprises a front section shaped to extend across the frontal head area of a wearer, two side sections ex-tending rearwardly from the front section and shaped to protect the sides of the wearer's head, and a centre section which extends rearwardly from the front section and then downwardly and which is shaped to protect the top, and rear head area, said centre and side sections being free of permanent attachment to one another rear-wardly of said front section and including respective surface portions which overlap at least in rear side areas of the helmet, which portions curve laterally inwardly from areas behind respective ear regions of the helmet, the centre section and side sections being displaceable relative to one another to vary the extent to which said surface portions overlap, and said curvature permitting both the longitudinal dimension and the lateral dimension of the helmet in the rear head area to be simultaneously adjusted by varying said overlap; and means adapted to fasten said overlapping surface portions of the centre and side sections in an adjusted position.
Claim 2
Dependent Claim
185 words
A protective helmet including: an outer shell which comprises a front section shaped to extend across the frontal head area of a wearer, two side sections ex-tending rearwardly from the front section and shaped to protect the sides of the wearer's head, and a centre section which extends rearwardly from the front section and then downwardly and which is shaped to protect the top, and rear head area, said centre and side sections being free of permanent attachment to one another rear-wardly of said front section and including respective surface portions which overlap at least in rear side areas of the helmet, which portions curve laterally inwardly from areas behind respective ear regions of the helmet, the centre section and side sections being displaceable relative to one another to vary the extent to which said surface portions overlap, and said curvature permitting both the longitudinal dimension and the lateral dimension of the helmet in the rear head area to be simultaneously adjusted by varying said overlap; and means adapted to fasten said overlapping surface portions of the centre and side sections in an adjusted position.
Claim 3
Dependent Claim
67 words
A helmet as claimed in claim 1, wherein said overlapping surface portions of the centre section and side sections extend over substantially the entire length of said centre section from said rear side areas of the helmet to said front section and said surface portions define respective compound curves providing for additional simultaneous height adjustment as a consequence of adjust-ment of the overlap of said surface portions.
Claim 4
Dependent Claim
101 words
A helmet as claimed in claim 1 or 2, wherein said fastening means comprise, at each side of the helmet, a bolt extending through an opening in the relevant side section and through a slot in said centre section, the slot being shaped to define a path described by a fixed point on the side section as said sections are moved from a position of minimum overlap to a position of maximum overlap, and a nut shaped to slide in said track and receiving said bolt, said bolt being turn-able from externally of the helmet to clamp said overlapping sections together.
Claim 5
Dependent Claim
40 words
A helmet as claimed in claim 1, wherein said front and side sections are formed as a single plas-tic moulding and said top section is formed as a second separate moulding secured to said front section by mechanical fastening means.
Claim 6
Dependent Claim
43 words
A helmet as claimed in claim 1 or 2, wherein said centre section includes a recess extending longi-tudinally of the section over a substantial portion of its length and defining a pair or parallel protuberant ribs extending along the length of the section.
Claim 7
Dependent Claim
29 words
A helmet as claimed in claim 4, wherein said side sections are shaped to completely cover the ears of a wearer and include openings providing ventilation to the ears.