Patent ID: 8678000
Filing Date: 2014-03-25
Classification: A62B

Abstract:
1. A portable breathing apparatus comprising: a, face mask having a demand valve, b, a blower for the supply of breathing air from an external ambient source to the demand valve via a supply line, c, a filter device for cleaning of the breathing air from the blower, and d, a compressed-air reservoir for alternative supply of breathing air to the demand valve, wherein the demand valve is configured to supply pressure equal to or above an ambient pressure, a check valve is arranged on an 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 upstream of the demand valve and downstream of the check valve so that gas or liquid from the surroundings can not penetrate upstream of the demand valve and downstream of the check valve when breathing gas is supplied from the compressed-air reservoir.