Abstract: There is provided a safety helmet with a helmet fitting and impact attenuation system. The system comprises a semi-rigid space frame attachable to the safety helmet and a headband, releasably attachable to one or more arms of the space frame. The space frame and headband accommodate the use of an impact attenuation liner mounted between the space frame and the helmet shell. The helmet fitting and impact attenuation system also may be used to update and retrofit existing helmet shells.

Abstract: There is provided a blast occurrence apparatus for indicating the occurrence of a significant and potentially injury causing blast overpressure. The apparatus comprises a base, a housing and blast indication means to provide a visual indication that a significant blast has occurred. A blast indication means may be implemented using a rupturable membrane or a layer of microencapsulated paint or dye material, dimensioned to rupture at the desired overpressure level. The device is configured to withstand acceleration or shock resulting from impact.

Abstract: Existing devices for stabilizing a safety helmet such as a hard hat are either unduly complicated or ill adapted as retrofits for existing helmets. A simple restraining device for use on new or existing helmets includes a bracket located at the center of the interior of each side of the helmet for pivotally supporting front and rear headbands. Pins extending through the headbands into arcuate slots in the brackets limit rotation of the front and rear headbands with respect to the brackets. A force tending to lift or rotate the helmet from the wearer's head will cause the headbands to pivot downwardly and inwardly against the wearer's head, thus inhibiting removal thereof from the head of the wearer.