R 408.13329 Helmet and hand shield lift fronts and chin rests.

Rule 3329. (1) The lift front of a helmet shall be fabricated from metal, plastic, or other suitable material. A snap hinge shall be provided so that the front part will stay up or down but will not remain in a partially opened position. The lift front seal against the helmet shall be light tight. The lift front shall be designed to accommodate a clear impact-resisting plate in the back or fixed part; a filter plate, impact-resisting, when specified; and a cover plate in the front part. The back or fixed part plate shall be clear heat-treated glass or plastic not more than 3/16 inch thick or less than 1/8 inch and capable of withstanding the impact test. (2) To avoid contact of a helmet or hand shield with the face of the wearer, a chin rest or adjustable position stop shall be provided. The chin rest and adjustable position stop shall be constructed of suitable rigid material and shall be detachable from the shell of the hand shield.