US3820537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained underwater breathing apparatus (scuba)
Assignee: Linde Sverige AB
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Filing: 1972-06-15
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Granted: 1974-06-28
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Expires: 1992-06-15
Abstract
Abstract An emergency self-contained underwater breathing apparatus (SCUBA) for supplementing a diver''s normal gas supply system and adapted to be switched on in response to failure of the gas feed from the normal system. This emergency unit comprises an auxiliary source of gas connected through a normally closed outlet valve to a through-flow storage provided with the inhalation and exhalation conduits extending to the diver''s helmet. On failure of the gas feed from the normal system, the outlet valve of the auxiliary source of gas will open causing the contents of gas under pressure in said source to be emptied into said through-flow storage, thereby forming a closed breathing circuit comprising the through-flow storage, the inhalation and exhalation conduits and the diver''s helmet. The inhalation conduit has a gas purifier inserted in it.
Inventors
- 👤 H Almqvist
- 👤 I Botos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
Breathing apparatus for deep diving, comprising: a diver''s helmet, an external breathing gas supply means, inhalation and exhalation conduits each connected to said helmet; quick release connecting means normally connecting said inhalation conduit and a feed conduit of said external gas supply means and normally connecting said exhalation conduit and a return conduit of said external gas supply system, a gas storage means, a first branch conduit connecting said storage means and said inhalation conduit, a second branch conduit comprising a first, normally closed valve connecting said storage and said exhalation conduit, an auxiliary gas source, conduit means comprising a second, normally closed valve for connecting said gas source and said storage, and manually operated means for simultaneously opening said first and said second valve and disconnecting said quick release connecting means for completely releasing the unit comprising helmet, storage and auxiliary gas source from the external gas supply system.
Claim 2
Dependent Claim
150 words
Breathing apparatus for deep diving, comprising: a diver''s helmet, an external breathing gas supply means, inhalation and exhalation conduits each connected to said helmet; quick release connecting means normally connecting said inhalation conduit and a feed conduit of said external gas supply means and normally connecting said exhalation conduit and a return conduit of said external gas supply system, a gas storage means, a first branch conduit connecting said storage means and said inhalation conduit, a second branch conduit comprising a first, normally closed valve connecting said storage and said exhalation conduit, an auxiliary gas source, conduit means comprising a second, normally closed valve for connecting said gas source and said storage, and manually operated means for simultaneously opening said first and said second valve and disconnecting said quick release connecting means for completely releasing the unit comprising helmet, storage and auxiliary gas source from the external gas supply system.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1 including a gas purifier inserted in said second branch conduit.
Claim 4
Dependent Claim
12 words
Apparatus according to claim 1 wherein said storage means is a bellows.
Claim 5
Dependent Claim
25 words
Apparatus according to claim 2, wherein the auxiliary gas source is in the form of a collapsable container disposed within the interior of said bellows.
Claim 6
Dependent Claim
50 words
Apparatus according to claim 1, wherein said quick release connecting means are provided with two oppositely interconnected non-return valves which are adapted to be actuated in response to an emergency disconnection so as to prevent wateringress into the external gas supply system and into the inhalation and exhalation conduits, respectively.
Claim 7
Dependent Claim
78 words
Apparatus according to claim 1 wherein the manually operated means is arranged, by means of a lever thereof, to actuate said quick release connecting means and a multi-functional valve adapted, firstly to change or switch over the connection of the inhalation and exhalation conduits, respectively from the external gas supply system to the auxiliary gas supply circuit, secondly to open said second branch conduit, and, thirdly, to open the conduit between the auxiliary gas source and the storage.
Claim 8
Dependent Claim
81 words
Apparatus according to claim 1 wherein the auxiliary gas source contains a gaseous mixture of a pressure and a composition such as to cause the average oxygen partial pressure of the gas supplied to the diver to be 1.5 atm. abs., this average oxygen partial pressure being exceeded for a brief initial period of time only, whereas the maximum oxygen partial pressure is 2.0 atm. abs., and the initial period of time is one third of the total period of use.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |