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AssigneeDragerwerk Aktiengessellschaft
InventorsErnst-Gunther Kolbe, Norbert Kollenbrandt, Hasso Weinmann, Wolfgang Drews, Karsten Vogeler, Hans-Burkhardt Fiedler
Estimating the term…
A closed-cycle breathing equipment and gas mask for operation under pressure with a pressurized air source for respiratory air and with an air bag being under prestress during the inspiration phase includes an arrangement where the prestress is decreased by a control element recognizing the expiratory phase and so as to support respiration during the expiration phase. A pneumatic control valve is used which can switch connections between the inspiration and the expiration phase and which is directly controlled by the difference between the exhalation pressure and the pressure in the air bag. The control valve connects the pressurized air source with the air bag during the inspiration phase and during the expiration phase it interrupts the connection due to the occurring dynamic pressure of the pressurized air from the pressurized air source and thus actuates a pneumatic adjusting element so that the mechanical prestress at the air bag is reduced.
A closed cycle breathing apparatus, comprising:
A pressure operated closed cycle breathing device, comprising a respiratory gas supply under pressure, a bellows member air bag having a fixed wall with inner and outer ends, a movable wall pivotally supported adjacent said inner end of said fixed wall and having a movable wall outer end, a bellows member connected between said fixed wall outer end and said moveable wall outer end and enclosing a space, an inhalation line connected to said air bag space, an exhalation line connected to said air bag space, control means connected to said respiratory gas supply, said control means including an interior portion a diaphragm means within said interior portion dividing said interior into a first space connected to said air bag space and a second space connected to said exhalation said diaphragm means line for sensing a pressure difference between said exhalation line and said air bag space and for connecting said respiratory gas supply to said air bag space in dependence upon the pressure difference sensed, mechanical coupling means having a mechanical adjusting element connected to said movable wall to move said movable wall during exhalation and connected to said respiratory gas delivery line and responsive to pressure in said line delivery to aid in moving said movable wall.
Dependencies are inferred from the claim text.