Air supply apparatus

Claim 1

An emergency air supply mask comprising, in combination: a head assembly including a rigid transparent bulbous face portion defining a generally circular rear peripheral edge and having an aperture formed in a bottom face thereof adjacent to the rear peripheral edge and a plurality of bores formed in a top face thereof also adjacent to the rear peripheral edge, a flexible hood portion mounted to the rear peripheral edge of the face portion for defining a circular bottom opening, a lateral elastic strap with an adjustable length mounted between diametrically opposed sides of the rear peripheral edge of the face portion and extending around a rear of the hood portion, a longitudinal elastic strap with an adjustable length having a first end connected to a top of the rear peripheral edge of the face portion and a second end connected to a central extent of the lateral strap; a filter unit including a generally rectangular transparent interior plate having a radius of curvature equal to that of the face portion of the head assembly and a plurality of bores formed therein, the plate coupled in spaced relationship to an interior surface of the face portion of the head assembly via a transparent closed periphery which has an opening only at a top extent thereof for allowing the selective insertion of a transparent filter therein; an insulated air supply assembly including a cylindrical tank having an outlet conduit coupled to a top face thereof and extending upwardly in coaxial relation therewith, wherein a top end of the conduit is sealingly coupled to the aperture of the face portion of the head assembly, the conduit having an eyelet pin mounted therein for allowing the supply of air from the tank to the head assembly only upon the removal thereof, wherein the tank resides in front of a chest of a user during use; a gauge mounted to the tank for indicating an amount of air within the tank; a nipple situated within the conduit at the aperture of the face portion of the head assembly for emitting a noise upon an existing air flow from the conduit to the face portion of the head assembly falling below a predetermined amount for audibly alerting the user of a decreasing amount of air within the tank; an excess pressure relief valve mounted on the tank for releasing air therefrom upon a pressure therein surpassing a predetermined amount; and a chest pad having a rectangular configuration mounted in tangential relationship with the tank and situated between the tank and the user during use.