Oxygen mask apparatus

Claim 1

In head-worn breathing apparatus having a breathing mask assembly adapted to cover the nose and mouth of the wearer during use, the combination with said assembly of: an open frame including a pair of elongated, spaced apart, foreand-aft extending side members adapted to be disposed on opposite sides of the wearer''s head during use, and structure at the normally forward ends of said members for supporting said mask assembly between the members, said structure including a yoke pivotally supporting the assembly for swinging of the latter about a generally horizontal axis extending between said members, and means pivotally joining said yoke with the forward ends of the members for swinging of the latter about respective generally vertical axes relative to the yoke; a head piece supported between said members at the rear ends of the latter having a single substantially rigid, generally planar, open ring, crown-engaging element pivotally mounted on each of said members for tilting movement about a generally horizontal axis and adapted to retain the frame on the wearer with said assembly in alignment with the wearer''s nose and mouth; and yieldable means associated with said frame for yieldably biasing the assembly against the wearer''s crown.