Helmets are a protective covering for the head worn with a hostile environment suit or vacc suit, or simply as a replacement for a face mask. Helmets have a standard neck-ring for attachments to protective suits and comes standard with multi-channel communicator, visor defogger, connections for the liquid food dispenser, water nipple, and oxygen or breathing air. It can be attached a standard filter mask, respirator, filter respirator combination, or portable life support system.
The rigid helmet is constructed of metal or plastic and comes with a headlamp, a padded interior, and two visored face-shields. The inner shield is designed to radiate the user's facial heat back into the helmet, thus heating it and preventing breath condensation fog or frost in its inner surface. The outer shield protects the wearer's eyes from overexposure to stellar radiation or other damaging light. The outer face plate can slide up and over the forehead. The helmet face plate has IR/LI standard which adjusts automatically in the LI mode (light intensification) to prevent blinding from over amplification. Adjustment can be made manually in the LI or IR (infrared radiation) mode.
A non-rigid helmet is a flexible plastic bag worn over the head. It is lighter, offers more complete protection against irritant atmospheres, and does not hamper the wearer as much as the clumsier mask. This allows normal speech and eliminates chafing caused by wearing a face mask too long. The bag remains inflated by a slight over-pressure and will not work in areas where the external pressure exceeds the air pressure in the helmet.
A transparent helmet or “goldfish bowl” type of helmet made of an impact resistant plastic; this protective device has certain advantages over the protective mask. It is lighter, offers more complete protection against irritant atmospheres, and does not hamper the wearer as much as the clumsier mask.