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 Title: |
US3837337:
SELF-CONTAINED CLOSED CIRCUIT BREATHING APPARATUS
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
LaViolette, Paul Alex; Schenectady, NY 12309
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| Assignee: |
None
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| Published / Filed: |
1974-09-24
/ 1973-01-29
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| Application Number: |
US1973000327769
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| IPC Code: |
Advanced:
A62B 7/08;
A62B 7/10;
Core:
A62B 7/00;
more...
IPC-7:
A62B 7/04;
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| U.S. Class: |
Current:
128/205.12;
128/205.16;
Original:
128/142.2;
128/147;
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| Field of Search: |
128/142.2,202,140 R,142,142.3,145-145.8,142.4-142.7,191 R,147
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| Priority Number: |
| 1973-01-29 |
US1973000327769 |
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| Abstract: |
The breathing apparatus provides a chemical canister, an expansible reservoir for positive pressure on the upstream side thereof, a contractible reservoir for negative pressure on the downstream side thereof, and suitable connecting conduits and a mouthpiece to provide a closed breathing circuit. The negative pressure reservoir comprises rigid top and bottom walls, a spacer extending from one to the other, and a rubber sleeve extending from one to the other so that it will be bowed in when air is withdrawn by inhalation. By enclosing the parts in a watertight enclosure and adding an oxygen bottle and suitable regulating valves, the apparatus can be adapted for underwater use.
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| Attorney, Agent or Firm: |
York, Foster ;
Jones, Bayard ;
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| Primary / Asst. Examiners: |
Gaudet, Richard A.; Cohen, Lee S.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 3 known family members
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First Claim:
Show all 8 claims |
I claim:
1. A self-contained, closed circuit breathing apparatus comprising an inhalation conduit and an exhalation conduit, a mouth connection communicating with said conduits for making connection with the mouth of the operator, an inhalation check valve and an exhalation check valve on either side of said mouth connection providing unidirectional flow through said inhalation and exhalation conduits respectively, a chemical canister connected across said inhalation and exhalation conduits, a positive pressure reservoir communicating with said exhalation conduit at a point between said chemical canister and said exhalation check valve, and a negative pressure reservoir communicating with said inhalation conduit at a point between said chemical canister and said inhalation check valve, said positive pressure reservoir comprising an expansible container having flexible wall means incorporating resilient means providing a positive pressure loading on the gas within said container when said container is expanded by an exhalation, and said negative pressure reservoir comprising a contractible chamber having flexible wall means incorporating resilient means providing a negative pressure loading on the gas within said chamber when said chamber is contracted by an inhalation.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 12 U.S. patent(s) that reference this one
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