MASK OF OXYGEN Russian patent published in 2001 - IPC

FIELD: oxygen equipment for aircraft crew members. SUBSTANCE: mask of oxygen has face part, pneumatic headset belts, and headset belt supercharging mechanism with switch, switch positioning key, inlet channel, oxygen supplying channel for supplying oxygen into headset belts, connecting channel extending between inlet channel and oxygen supplying channel, as well as channel for releasing oxygen from pneumatic headset belts. Pneumatic headset belts adjusting mechanism has control member arranged on switch positioning key, and is movable between two positions. One of two positions of control member provides for hermetical closing of channel for releasing oxygen from pneumatic headset belts at any position of switch positioning key. Effective section of connecting channel which is opened when control member is moved to one position is less than effective section of the same channel which is opened when control member is moved to other position. Mask of oxygen may be used by aircraft crew members for protecting them from oxygen deprivation in case of emergency cockpit seal failure. EFFECT: simplified construction and increased efficiency. 2 cl, 4 dwg