EP 0922631 A1 19990616 - A semi-closed circuit, underwater breathing apparatus for medium and great depths
Title (en)
A semi-closed circuit, underwater breathing apparatus for medium and great depths
Title (de)
Unterwasseratmungsgerät für mittlere- und grössere Tiefen, mit halbgeschlossenem Kreislauf
Title (fr)
Appareil respiratoire pour plongées moyennes et profondes avec cirucuit semi-fermé
Publication
Application
Priority
EP 97830577 A 19971106
Abstract (en)
A semi-closed circuit, underwater breathing apparatus for medium and great depths, comprising a source of breathing gas connected through a delivery pressure regulator to an expandible plenum chamber (4) having a pair of rigid walls (15,16); said expandible plenum chamber (4) being connected to a semi-closed circuit including a soda-lime filter (7) and an inspiration/exhalation mouthpiece for a diver; said expandible plenum chamber (4) being in mechanical connection with a discharge valve (11) towards the environment for discharging the surplus of breathing gas in the exhalation circuit as a consequence of an excessive expansion of said expandible plenum chamber caused by an increase of pressure of the breathing gas within said plenum chamber during normal breathing; there being also provided means with automatic control for the adjustment of the flow of breathing gas towards said plenum chamber as a function of the environment pressure (water head), and means for increasing the flow of breathing gas towards said plenum chamber for counteracting a possible collapsing of said expandible plenum chamber in the event of a fast increase of the environment pressure. <IMAGE>
IPC 1-7
IPC 8 full level
B63C 11/24 (2006.01)
CPC (source: EP)
B63C 11/24 (2013.01)
Citation (search report)
- [XAY] US 3316905 A 19670502 - SEELER HENRY W
- [YA] FR 1538953 A 19680913
- [YA] FR 1550305 A 19681220
- [A] US 5619987 A 19970415 - MATSUOKA SHUNSUKE [JP]
- [A] US 2931357 A 19600405 - MANSSON ARBORELIUS MANS, et al
- [A] FR 1479578 A 19670505 - SHELL INT RESEARCH
- [A] GB 862984 A 19610315 - DRAGER OTTO H
Designated contracting state (EPC)
ES FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 97830577 A 19971106