Patent ID: 7051732

Claim:
A respiratory helmet comprising: a helmet configured to provide protection to a user's cranium area, the helmet including an exterior surface having parallel elliptical recess areas that intrude into the exterior surface of the helmet; wheels rotatably received within the recess areas and, the wheels rotating along parallel elliptical paths relative to the helmet, each recess area being shaped to decrease accumulation of particulates in the recess area; a visor joined to the wheels and configured to provide protection to the user's face area; the visor being moved relative to the helmet between positions remote from, and in front of, the user's face area, the visor defining a breathing zone between the visor and the front of the user's face area, the visor having a top side and a bottom side wherein the bottom side is positioned closer to the user's chin when the visor is positioned in front of the user's face; and an air intake system having an intake unit that receives a gaseous medium from one of a gaseous medium supply system and ambient air in the helmet, the intake unit directing the gaseous medium toward the breathing zone.