초록 ▼

The present invention concerns closed circuit breathing apparatus comprising a mask having inhalation and exhalation ducts in communication with a regenerator for regenerating exhaled air. A source of air under pressure is connected to the closed circuit so as to feed unused air into the circuit in

The present invention concerns closed circuit breathing apparatus comprising a mask having inhalation and exhalation ducts in communication with a regenerator for regenerating exhaled air. A source of air under pressure is connected to the closed circuit so as to feed unused air into the circuit in such a manner as to draw regenerated air to the mask and to maintain a slight over pressure.

대표청구항 ▼

Apparatus for supplying breathable fluid to a user, the apparatus comprising, in combination: a mask having an inhalation orifice, an exhalation orifice and a control orifice in the region of the mouth of the user; means defining an inhalation space; an inhalation duct interconnecting the inhalation

Apparatus for supplying breathable fluid to a user, the apparatus comprising, in combination: a mask having an inhalation orifice, an exhalation orifice and a control orifice in the region of the mouth of the user; means defining an inhalation space; an inhalation duct interconnecting the inhalation space and the inhalation orifice; a supply of breathable fluid under pressure; means including a supply conduit having an infeed end connected to said supply and a discharge end communicating with the inhalation space; valve means interposed in the supply conduit and being movable in response to the application of fluid pressure between a closed position blocking the flow of unused fluid in said conduit and an open position permitting the passage of unused fluid to said discharge end; conduit means interconnecting the valve means and the supply of breathable fluid for applying pressure to said valve means to maintain it in its closed position; and a pressure sensing mechanism interposed in the conduit means for regulating the valve means in response to the respiratory pressure in the region of the mouth of the user, the pressure sensing mechanism including a control conduit connected to the control orifice in said mask and means responsive to a decrease in pressure in said mask for moving the valve means to its open position to thereby permit the flow of fluid from the discharge end of the supply conduit.