Air supplying hood

Claim 2

An air supplying hood comprising a top wall, a flexible plastic front wall connected at its upper edge with the top wall, the upper portion of the front wall forming a transversely curved front window, a flexible back wall behind the window connected with the top wall and the sides of the window to thereby form with the window an open-bottom enclosure for a person's head, the lower portion of the flexible back wall and the front wall below the window forming areas shaped to fit over a person's shoulders and lie against his chest and back, the walls of said enclosure being provided with a plurality of circumferentially spaced hollow vertical struts closed at their upper ends, a hollow band extending around the hood at the upper end of said areas and in fluid flow communication with the lower ends of the struts, said band and struts being inflatable to stiffen them, inflation means for inflating said band and struts, an air tube extending through said back wall for supplying air to said head enclosure, said back wall provided with an opening admitting said tube to the head enclosure, and said inflation means comprising said tube having a lateral opening in fluid communication with the inside of at least one of said struts to inflate the struts and band, said tube further in fluid flow communication with an air muffler provided within the head enclosure downstream of said lateral opening wherein the air muffler discharges air from said tube to the head enclosure.

Claim 3

An air supplying hood according to claim 1, in which said struts and band are formed by a flexible layer of air-impervious material sealed to the adjoining enclosure wall along the edges of the struts and band.

Claim 4

An air supplying hood comprising a top wall, a flexible plastic front wall connected at its upper edge with the top wall, the upper portion of the front wall forming a transversely curved front window, a flexible back wall behind the window connected with the top wall and the sides of the window to thereby form with the window an open-bottom enclosure for a person's head, the lower portion of the flexible back wall and the front wall below the window forming areas shaped to fit over a person's shoulders and lie against his chest and back, the walls of said enclosure being provided with a plurality of circumferentially spaced hollow vertical struts closed at their upper ends, a hollow band extending around the hood at the upper end of said areas and in fluid flow communication with the lower ends of the struts, said band and struts being inflatable to stiffen them, inflation means for inflating said band and struts, an air tube extending through said back wall for supplying air to said head enclosure, said back wall provided with an opening admitting said tube to the head enclosure, and said inflation means comprising said tube having a lateral opening in fluid flow communication with the inside of at least one of said struts to inflate the struts and band, said tube further in fluid flow communication with an air muffler provided within the head enclosure downstream of said lateral opening wherein the air muffler discharges air from said tube to the head enclosure, the air muffler comprising a solid upper wall held against the back portion of said top wall, an upper body of open cell plastic foam engaging the lower surface of said upper wall, an upper sheet of perforated material enclosing said foam body and secured at its edges to said upper wall, a lower body of open cell plastic foam engaging the lower surface of said perforated sheet, and a lower sheet of perforated material enclosing said lower foam body and secured at its edges to said upper wall, said perforated sheets and said lower body being provided with a passage therethrough, and the upper end of said air tube extending through said passage to deliver air to said upper body.

Claim 5

An air supplying hood comprising a top wall, a flexible plastic front wall connected at its upper edge with the top wall, the upper portion of the front wall forming a transversely curved front window, a flexible back wall behind the window connected with the top wall and the sides of the window to thereby form with the window an open-bottom enclosure for a person's head, the lower portion of the flexible back wall and the front wall below the window forming areas shaped to fit over a person's shoulders and lie against his chest and back, the walls of said enclosure being provided with a plurality of circumferentially spaced hollow vertical struts closed at their upper ends, a hollow band extending around the hood at the upper end of said areas and in fluid flow communication with the lower ends of the struts, said band and struts being inflatable to stiffen them, inflation means for inflating said band and struts, an air tube extending through said back wall for supplying air to said head enclosure, said back wall provided with an opening admitting said tube to the head enclosure, and said inflation means comprising said tube having a lateral opening in fluid flow communication with the inside of at least one of said struts to inflate the struts and band, said tube further in fluid flow communication with an air muffler provided within the head enclosure downstream of said lateral opening wherein the air muffler discharges air from said tube to the head enclosure, the air muffler comprising a solid upper wall held against the back portion of said top wall, an upper body of open cell plastic foam engaging the lower surface of said upper wall, an upper sheet of perforated material enclosing said foam body and secured at its edges to said upper wall, a lower body of open cell plastic foam engaging the lower surface of said perforated sheet, and a lower sheet of perforated material enclosing said lower foam body and secured at its edges to said upper wall, said perforated sheets and said lower body being provided with a passage therethrough, and the upper end of said air tube extending through said passage to deliver air to said upper body.

Claim 6

An air supplying hood according to claim 3, in which the portion of said top wall in front of said muffler is transparent.