In a preferred embodiment, methods and systems for the control of the breathing gas supply from a pressure-leading supply conduit to one or more breathing masks of an oxygen emergency supply device in a passenger aircraft include an on/off valve arranged between the supply conduit and the one or more breathing masks. The valve can be blocked or released to control air supply based upon monitoring mass flow to the breathing masks. The valve, for example, is actuated to an open position until the error between the actual mass flow and a desired mass flow exceeds a maximal error value, whereupon the valve is actuated to a closed position until the error between the actual mass flow and the desired mass flow exceeds a minimal error value whereupon the valve is actuated to the open position and the mass flow monitoring cycle is repeated.

A system and method for delivering oxygen to a passenger of an aircraft including a a supply of oxygen, an oral-nasal mask, a controller for adjusting a flow of oxygen from the supply of oxygen to the oral-nasal mask, and a sensor for determining a user's blood oxygen saturation level, wherein the controller adjusts the flow of oxygen based on the sensor's determination of the user's blood oxygen saturation level.

A system and method for delivering oxygen to a passenger of an aircraft including a a supply of oxygen, an oral-nasal mask, a controller for adjusting a flow of oxygen from the supply of oxygen to the oral-nasal mask, and a sensor for determining a user's blood oxygen saturation level, wherein the controller adjusts the flow of oxygen based on the sensor's determination of the user's blood oxygen saturation level.

The invention relates to an oxygen mask (1) for an emergency oxygen supply of passengers in an aircraft, with a carrier (12), on which a breathing bag connection (5) for a breathing bag (11), an inhalation valve (3) and an exhalation valve (4) are provided, wherein the carrier (12) comprises at least two carrier parts (14, 15, 16) which are arranged pivotable to one another.

The invention relates to an oxygen mask (1) for an emergency oxygen supply of passengers in an aircraft, with a carrier (12), on which a breathing bag connection (5) for a breathing bag (11), an inhalation valve (3) and an exhalation valve (4) are provided, wherein the carrier (12) comprises at least two carrier parts (14, 15, 16) which are arranged pivotable to one another.

An oxygen system supplies either 100% oxygen to a demand valve in a mask or pulses of oxygen to the mask. Switching is automatic during a parachute descent. The system includes a valve manifold that is responsive to ambient pressure such that at low pressures it is configured to deliver gas from either an oxygen cylinder or an aircraft supply line to the mask demand valve and at higher pressures it is configured to deliver gas from the cylinder to a pulse gas delivery system. The mask also includes an inhalation valve that is closed if oxygen is supplied to the demand valve. Otherwise, the inhalation valve opens to allow ambient air to be drawn in and the pulse gas delivery system delivers a pulse of oxygen in response to the onset of inhalation.

An oxygen system supplies either 100% oxygen to a demand valve in a mask or pulses of oxygen to the mask. Switching is automatic during a parachute descent. The system includes a valve manifold that is responsive to ambient pressure such that at low pressures it is configured to deliver gas from either an oxygen cylinder or an aircraft supply line to the mask demand valve and at higher pressures it is configured to deliver gas from the cylinder to a pulse gas delivery system. The mask also includes an inhalation valve that is closed if oxygen is supplied to the demand valve. Otherwise, the inhalation valve opens to allow ambient air to be drawn in and the pulse gas delivery system delivers a pulse of oxygen in response to the onset of inhalation.

Aspects of the invention relate to personal protection systems against COVID-19 including face masks and methods, systems or devices of managing, regulating and/or filtering airflow during travel on an aircraft, train, or bus.

A chemical oxygen core for a chemical oxygen generator includes at least one layer of an oxygen-generating composition. In some examples, the at least one layer comprises includes a metal powder fuel, a transition metal oxide catalyst, and an oxygen source. In various examples, the at least one layer includes less than approximately 0.1 percent by weight of the transition metal oxide catalyst. In certain examples, a chemical oxygen generator includes a chemical oxygen core and a perforated metal covering surrounding the chemical oxygen core along a length of the chemical oxygen core. In some aspects, the perforated metal covering has an opening ratio of approximately 0 to 100 percent.

A chemical oxygen core for a chemical oxygen generator includes at least one layer of an oxygen-generating composition. In some examples, the at least one layer comprises includes a metal powder fuel, a transition metal oxide catalyst, and an oxygen source. In various examples, the at least one layer includes less than approximately 0.1 percent by weight of the transition metal oxide catalyst. In certain examples, a chemical oxygen generator includes a chemical oxygen core and a perforated metal covering surrounding the chemical oxygen core along a length of the chemical oxygen core. In some aspects, the perforated metal covering has an opening ratio of approximately 0 to 100 percent.