Gas mask
AssigneeDräger Safety AG & Co. KGaA
InventorsAlexander BUSCH, Dirk FEIL
Life of this patent
Estimating the term…
Abstract
A gas mask is provided for normal-pressure and overpressure operation with at least one breathing port, an expiration valve with a valve spring, an adjusting element affecting the prestress of the valve spring and a pushing element having a first switching position and a second switching position. The pushing element is designed to act on the adjusting element during a translatory motion from the first switching position into the second switching position. A change in the prestress of the valve spring can be brought about and a switchover from a “normal pressure” mode into an “overpressure” mode can thus be carried out.
Claims20
A gas mask for normal pressure and overpressure modes, the gas mask comprising:
- one or more breathing ports;
- an expiration valve with a valve spring;
- an adjusting element affecting a prestress of the valve spring;
- and
- a pushing element having a first switching position and a second switching position, the pushing element acting on the adjusting element during a translatory motion from the first switching position into the second switching position, so that a change in the prestress of the valve spring is brought about and a switchover from the normal pressure mode to the overpressure mode is carried out.
A gas mask comprising:
- a mask body defining a mask interior;
- a breathing port;
- an expiration valve with a valve spring;
- an adjusting element affecting a prestress of the valve spring;
- and
- a pushing element having a first switching position and a second switching position, the pushing element acting on the adjusting element during a translatory motion from the first switching position into the second switching position, so that a change in the prestress of the valve spring is brought about and there is a switchover from a normal mode in which a pressure level in the mask interior corresponds to atmospheric ambient pressure to an overpressure mode in which a pressure level in the mask interior is higher than that of the atmospheric ambient pressure.
Dependencies are inferred from the claim text.