Self-contained breathing system
First Claim
Patent Images
1. A breathing apparatus, comprising:
- a chassis including a housing defining a breathing reservoir, a first inlet in fluid communication with said breathing reservoir for receiving breathable gas from a self-contained source of breathing gas, a second inlet in fluid communication with said breathing reservoir for receiving ambient air, and a first outlet in fluid communication with said breathing reservoir for delivering breathable gas to a user;
a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said breathing reservoir;
a main filter assembly positioned between said second inlet and said breathing reservoir for removing contaminants from the ambient air; and
said chassis adapted to accommodate a plurality of breathing gas container sizes.
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Abstract
A breathing apparatus is operable in self-contained and filtered modes of operation. In the self-contained mode of operation, a breathable gas is delivered to a user from a self-contained source of breathing gas. In a second, filtered mode of operation, a suction source draws ambient air through a filter removing contaminants and delivers filtered ambient air to the user. A method of delivering air to a subject is also provided.
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Citations
32 Claims
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1. A breathing apparatus, comprising:
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a chassis including a housing defining a breathing reservoir, a first inlet in fluid communication with said breathing reservoir for receiving breathable gas from a self-contained source of breathing gas, a second inlet in fluid communication with said breathing reservoir for receiving ambient air, and a first outlet in fluid communication with said breathing reservoir for delivering breathable gas to a user; a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said breathing reservoir; a main filter assembly positioned between said second inlet and said breathing reservoir for removing contaminants from the ambient air; and said chassis adapted to accommodate a plurality of breathing gas container sizes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A breathing apparatus, comprising:
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a chassis including a housing defining a breathing reservoir, a first inlet in fluid communication with said breathing reservoir for receiving breathable gas from a self-contained source of breathing gas, a second inlet in fluid communication with said breathing reservoir for receiving ambient air, and a first outlet in fluid communication with said breathing reservoir for delivering breathable gas to a user; a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said breathing reservoir; a main filter assembly positioned between said second inlet and said breathing reservoir for removing contaminants from the ambient air; an air hose for supplying breathable gas to a user, said air hose having a first end adapted to be removably connected to said first outlet and a second end opposite the first end; optionally, a face mask adapted to be worn over a user'"'"'s face and having a connection port adapted to be removably connected to the second end of said air hose; and one or both of; a purge valve connected to the second end of said air hose, the purge valve fluidically connected to a gas pressure regulator and manually actuable to provide a burst of regulated air from the gas pressure regulator; and an alarm system for providing a user-perceptible alert when a pressure of the self-contained breathing system falls below a preselected value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A breathing apparatus, comprising:
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a chassis including a housing defining a breathing reservoir, a first inlet in fluid communication with said breathing reservoir for receiving breathable gas from a self-contained source of breathing gas, a second inlet in fluid communication with said breathing reservoir for receiving ambient air, and a first outlet in fluid communication with said breathing reservoir for delivering breathable gas to a user; a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said breathing reservoir; a main filter assembly positioned between said second inlet and said breathing reservoir for removing contaminants from the ambient air; a second outlet for delivering a breathing gas to a user; and said first and second outlets disposed on opposite sides of a center line of said chassis, said first and second outlets being selectively attachable to an air hose according to the user'"'"'s preference. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A breathing apparatus, comprising:
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a chassis including a housing defining a breathing reservoir, a first inlet in fluid communication with said breathing reservoir for receiving breathable gas from a self-contained source of breathing gas, a second inlet in fluid communication with said breathing reservoir for receiving ambient air, and a first outlet in fluid communication with said breathing reservoir for delivering breathable gas to a user; a suction source mounted within said chassis and in fluid communication with said second inlet for drawing ambient air into said breathing reservoir; a main filter assembly positioned between said second inlet and said breathing reservoir for removing contaminants from the ambient air; and a prefilter assembly positioned upstream of the main filter for removing contaminants from said ambient air. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification