# US 5,348,001 A · Oxygen breathing controls

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- Number: US 5,348,001 A
- Document ID: US5348001A
- Status: Granted
- Kind: A
- Application number: 07/929,701
- Filed: 1992-08-12
- Granted: 1994-09-20
- Earliest claimed: 1992-08-12
- Assignees: American Safety Flight Systems, Inc.
- Inventors: Joseph S. Danon
- Web page: https://patentgrep.com/patent/US5348001A

## CPC

- A62B 7/14: for high-altitude aircraft
- A61M 16/206: {Capsule valves, e.g. mushroom, membrane valves}
- A61M 16/207: {Membrane valves with pneumatic amplification stage, i.e. having leader and follower membranes}
- A61M 16/209: {Relief valves}
- A62B 9/02: Valves {(non-return valves mounted in breathing masks or helmets A62B18/10)}
- A62B 9/027: {pilot operated, i.e. controlled by valve means sensitive to a reduced downstream pressure}
- G05D 16/0661: {characterised by the loading mechanisms of the membrane}
- A61M 16/107: {in the inspiratory path}
- A61M 16/20: Valves specially adapted to medical respiratory devices
- Y10T 137/7759: Responsive to change in rate of fluid flow
- Y10T 137/782: Reactor surface is diaphragm
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The oxygen breathing control of the present invention for supplying oxygen to a user employs a first stage regulation module, a valving module which couples with the first stage regulation module, a servo regulator module and an aneroid module. The servo regulator module with oxygen conservation function during exhalation controls oxygen flow between zero to approximately 34,000 feet, and the aneroid module takes over the control of breathing pressure schedule between 34,000 to 45,000 feet. A flow restrictor screw module is employed in the passage between a control chamber and an inlet chamber of the valving module for regulating the flow between the two chambers.

## Claims

### Claim 1

An oxygen breathing control for supplying an oxygen containing fluid comprising:
a ) a first inlet regulator having:
an inlet housing having an inlet opening;
an inlet valve disposed inside the inlet housing near the inlet opening;
a piston disposed inside the inlet housing downstream of the inlet valve and having a piston chamber; and
means for opening the inlet valve during inhalation of a user to allow the fluid through to the piston chamber; and
b) a second inlet regulator coupled with the first inlet regulator and disposed downstream thereof, having:
an inlet chamber;
a control chamber disposed downstream of the inlet chamber;
a valve liner separating the inlet chamber and the control chamber, the valve liner being flexible; and
means for creating a pressure differential across the inlet chamber and the control chamber and for flexing the valve liner to permit fluid flow upon inhalation.

### Claim 2 (depends on 1)

The oxygen breathing control as claimed in claim 1, further comprising means for shutting the fluid flow during exhalation.

### Claim 3 (depends on 1)

The oxygen breathing control as claimed in claim 1, further comprising a flow restrictor screw module for restricting the flow between the inlet chamber and the control chamber.

### Claim 4 (depends on 1)

The oxygen breathing control as claimed in claim 1 further comprising a servo regulator coupled to the inlet chamber and the control chamber, the servo regulator regulating the pressure differential according to inhalation and exhalation by the user.

### Claim 5 (depends on 1)

The oxygen breathing control as chimed in claim 1, further comprising a valve cage near the end of the inlet chamber, the valve cage having a plurality of slots.

### Claim 6

An oxygen breathing control for supplying oxygen having:
a) an inlet regulator means for regulating the flow of the oxygen having a piston means for accelerating a rate of the oxygen supply and an inlet diaphragm disposed downstream from the piston, the inlet diaphragm responsive to a pressure differential across the diaphragm;
b) an outlet chamber; and
c) a servo regulator module including means for further regulating the pressure of the flow of the oxygen to the outlet chamber having:
an atmospheric chamber;
a regulator adjustment screw partially disposed in the atmospheric chamber; and
a regulator diaphragm coupled to the regulator adjustment screw and disposed in the atmospheric chamber, the regulator diaphragm having a pilot regulator valve, wherein the pilot regulator valve opens when the regulator adjustment screw is unscrewed, and the pilot valve closes when the regulator adjustment screw is tightened.

### Claim 7 (depends on 6)

The oxygen breathing control as claimed in claim 6, further comprising means for bleeding oxygen internally to the outlet chamber.

### Claim 8 (depends on 6)

The oxygen breathing control as claimed in claim 6, further comprising means for controlling a minimum pressure limit with respect to altitude.

### Claim 9 (depends on 6)

The oxygen breathing control as claimed in claim 6, further comprising a flow restrictor screw module for controlling a maximum pressure limit with respect to altitude.

### Claim 10 (depends on 6)

The oxygen breathing control as claimed in claim 6, further comprising an aneroid module pneumatically connected to the servo regulator module and establishing pressure of the oxygen supply, having:
an aneroid chamber defining a flow hole in one wall and a vent in another;
a bleed stem disposed in the flow hole in the aneroid chamber; and
a control aneroid disposed in the aneroid chamber, wherein the control aneroid expands and displaces the bleed stem in the flow hole, thereby letting the oxygen flow from the servo regulator module to the aneroid chamber through the flow hole and to atmosphere through the vent.