Portable breathing apparatus
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United States of America Patent
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Mar 25, 2014
Issued Date -
N/A
app pub date -
Jun 1, 2004
filing date -
Jun 2, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
In aspects, a portable breathing apparatus is provided that includes a face mask having a breathing valve, a blower for the supply of breathing air to the breathing valve via a supply line, a filter device for cleaning of the breathing air from the blower, and a compressed-air reservoir for alternative supply of breathing air to the breathing valve. Additionally, the breathing valve is a demand valve configured to supply pressure equal to or above an ambient pressure, a check-valve is arranged on the upstream side of the blower, and the compressed-air reservoir is provided with a pressure control valve for establishing an overpressure above the ambient pressure in the entire breathing system, wherein the pressure control valve is upstream of the breathing valve and downstream of the check valve, so that gas or liquid cannot penetrate into the system when breathing gas is supplied from the compressed-air reservoir.
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