Patent ID: 7575004
Filing Date: 2009-08-18
Classification: A62B,F16K

Abstract:
1. A human breathing device, comprising: a lung demand valve; a user interface part to be connected to the user defining a breathing space at the mouth of the user; a breathing connection connected to the user interface part, said breathing connection having an intake passage connection and an exhalation passage, said lung demand valve being detachably connected to said breathing connection; and an expiration valve associated with the breathing connection, said expiration valve for regulating passage of gas out of said breathing space, said expiration valve including a valve spring and an adjusting device affecting a pretension of said valve spring, said adjusting device including an angle lever pivotable about an axis of rotation for performing a changeover from a stable angular position for normal pressure operation with less pretension of said valve spring to a different angular position for an overpressure operation with greater pretension of said valve spring, said valve spring being connected to said angle lever and said expiration valve.