The emergency oxygen supply for passengers in an aircraft comprises an oxygen source with a number of pulse breathing masks which are conductively connected to the oxygen source, wherein an individual shut-off valve which in the non-actuated condition is switched to block is provided in each conduit to a breathing mask. The emergency oxygen supply moreover comprises an impulse breathing control for actuating each individual shut-off valve, as well as an auxiliary conduit which connects the oxygen source to the breathing masks whilst bypassing the individual shut-off valves and which in each case via a check valve is connected to the respective conduit which leads to the breathing mask, or to the breathing mask itself. The auxiliary conduit is connected to the oxygen source via a central shut-off valve which is switched to open in the non-actuated condition.

The emergency oxygen supply for passengers in an aircraft comprises an oxygen source with a number of pulse breathing masks which are conductively connected to the oxygen source, wherein an individual shut-off valve which in the non-actuated condition is switched to block is provided in each conduit to a breathing mask. The emergency oxygen supply moreover comprises an impulse breathing control for actuating each individual shut-off valve, as well as an auxiliary conduit which connects the oxygen source to the breathing masks whilst bypassing the individual shut-off valves and which in each case via a check valve is connected to the respective conduit which leads to the breathing mask, or to the breathing mask itself. The auxiliary conduit is connected to the oxygen source via a central shut-off valve which is switched to open in the non-actuated condition.

An improved safety device for a self-contained breathing apparatus, and an improved self-contained breathing apparatus having thermal imaging capabilities.

An improved safety device for a self-contained breathing apparatus, and an improved self-contained breathing apparatus having thermal imaging capabilities.

A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

A pressure regulator assembly for an SCBA includes a valve assembly having a piston, a cylinder for receiving the piston, a sealing member for engagement by the piston, a conduit extending through the piston and facilitating fluid communication between an inlet chamber and a cavity of the cylinder, and a driving assembly for facilitating the engagement and disengagement of the piston responsive to a change of pressure in the outlet chamber. A bypass assembly for an SCBA is also disclosed.

Apparatus and associated methods relate to determining a fit-quality metric for a mask/face combination based upon a calculated dead-space volume between a virtual mask and a virtual face virtually aligned so as to create an integrity seal circumscribing a mouth and nose region. In an illustrative embodiment, an interactive virtual fitting system may receive a three-dimensional (3D) virtual face associated with a person. The system may retrieve 3D models of various respirators selected by user determined criteria. The system may then compute a fit-quality metric for each of the retrieved 3D models. The potential wearer may then be presented with the metrics for review. The potential wearer may select a respirator based upon these computed metrics. A virtual fitting of many respirators may advantageously reduce the time needed for selecting a properly fitting respirator while simultaneously ensuring that the selected respirator may be comfortable and well fitting.

Apparatus and associated methods relate to determining a fit-quality metric for a mask/face combination based upon a calculated dead-space volume between a virtual mask and a virtual face virtually aligned so as to create an integrity seal circumscribing a mouth and nose region. In an illustrative embodiment, an interactive virtual fitting system may receive a three-dimensional (3D) virtual face associated with a person. The system may retrieve 3D models of various respirators selected by user determined criteria. The system may then compute a fit-quality metric for each of the retrieved 3D models. The potential wearer may then be presented with the metrics for review. The potential wearer may select a respirator based upon these computed metrics. A virtual fitting of many respirators may advantageously reduce the time needed for selecting a properly fitting respirator while simultaneously ensuring that the selected respirator may be comfortable and well fitting.

A system, management device, SCBA and wearable device are provided. In one or more embodiments, a wearable device for use with a self-contained breathing apparatus (SCBA) is provided. The device includes device processing circuitry configured to: determine a wireless personal accountability report (PAR) signal has been received, and transition into an alarm state based on the received wireless PAR signal. The alarm state configured to trigger at least one notification while in the alarm state where the triggering of at least one notification is configured to recur until an indication is received.

A system, management device, SCBA and wearable device are provided. In one or more embodiments, a wearable device for use with a self-contained breathing apparatus (SCBA) is provided. The device includes device processing circuitry configured to: determine a wireless personal accountability report (PAR) signal has been received, and transition into an alarm state based on the received wireless PAR signal. The alarm state configured to trigger at least one notification while in the alarm state where the triggering of at least one notification is configured to recur until an indication is received.