Surgery – Respiratory method or device – Including body or head supported means covering user's scalp
Reexamination Certificate
1999-07-13
2001-08-28
Weiss, John G. (Department: 3761)
Surgery
Respiratory method or device
Including body or head supported means covering user's scalp
C128S201250, C128S205280
Reexamination Certificate
active
06279571
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an emergency breathing apparatus in the form of a hood for use in an environment where there is fire or contamination.
BACKGROUND OF THE INVENTION
Emergency breathing apparatus of this kind are used in emergency situations in modern transport systems and especially in passenger aircraft, railroads and ships and are intended to protect passengers and crew against the consequences of fire and especially from smoke and gas poisonings.
U.S. Pat. No. 5,027,810 discloses an emergency breathing apparatus incorporating a hood which makes oxygen from a pressurized cylinder available for a time duration of approximately 5 to 10 minutes. The central component of this hood contains the pressurized gas cylinder with oxygen, a labyrinth-like configured flowpath through an absorption material and an ejector directly at the outlet valve of the pressurized gas cylinder.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an emergency breathing apparatus incorporating a hood for use in an environment where there is fire or contamination. It is also an object of the invention to provide such an apparatus which, on the one hand, is compact and easy to carry and, on the other hand, is robust and easy to manipulate.
The emergency hood of the invention is to be worn by a person in an environment where there is fire or contamination. The emergency hood includes: a hood closing off the head of the person to the ambient and the hood having an elastic, gas-impermeable ruff extending down to the neck and shoulder region of the wearer; the hood defining an interior space for accommodating the head of the wearer and being made of a fire resistant gas-impermeable material and having a transparent visor in the region of the eyes or face of the person and the visor likewise being made of fire resistant, gas-impermeable material; an oxygen supply unit for supplying oxygen to the hood for use by the person; a water and carbon dioxide absorbing flexible areal absorber unit mounted in the interior space; and, the absorber unit having an ejector connected to the oxygen supply unit for discharging the oxygen into the interior space and for moving the respiratory air of the wearer out of the interior space and through the absorber unit whereby respiratory air again enters the interior space with water and carbon dioxide removed therefrom.
The essential advantage of the invention compared to the emergency breathing apparatus of the state of the art results from the areal flexible configuration of the absorber element in combination with the conduction of the gas via the ejector from a separate oxygen supply into the interior of the hood, on the one hand, and from the interior space of the hood via the ejector into the absorber element, on the other hand.
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Drager Aerospace GmbH
Mitchell Teena
Ottesen Walter
Weiss John G.
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