Patent ID: 8966670
Filing Date: 2015-03-03
Classification: A42B

Abstract:
1. A safety helmet comprising: an outer shell and an inner shell, wherein the outer shell comprises a first part and a second part, the first part comprising a crown and the second part comprising a skirt; wherein the skirt descends from an edge of the crown; wherein the crown and skirt together form a continuous convex surface; wherein the inner shell has a lower edge; wherein the skirt has a skirt return edge extending orthogonally to the skirt across at least a portion of the lower edge of the inner shell; wherein the skirt return edge is continuous; wherein the edge of the crown has a crown return edge having an in-turned flange forming a seat for the skirt; wherein the in-turned flange extends into the inner shell orthogonal to the crown; wherein the crown return edge has a rim which extends downwardly into the inner shell orthogonal to the in-turned flange; wherein the crown return edge is continuous; wherein the skirt return edge and the crown return edge provide form-locking of the crown and skirt; wherein the crown comprises a first thermoplastic polymer material; wherein the skirt comprises a second thermoplastic polymer material that is a different material from the first thermoplastic polymer material; wherein the second thermoplastic polymer material is stronger and more impact resistant than the first thermoplastic polymer material wherein the first thermoplastic polymer material is vacuum-formed polycarbonate; and wherein the second thermoplastic polymer material is injection-moulded acrylonitrile butadiene styrene; and wherein the inner shell comprises a liner of expanded polystyrene, co-moulded with the crown and the skirt of the outer shell, wherein the co-moulded liner maintains the crown and skirt of the outer shell in a fixed relationship.