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US 5,127,398 AGranted
Breathing apparatus mouthpiece
AssigneeCis-Lunar Development Laboratories, Inc.
InventorWilliam C. Stone
Life of this patent
Estimating the term…
Abstract
A breathing apparatus mouthpiece which is reversibly switchable between an open circuit and a closed circuit system by rotating a special valve in the mouthpiece. The breathing apparatus mouthpiece is compact, lightweight, easy to operate and has low breathing resistance.
Claims23
A mouthpiece for a breathing apparatus, said mouthpiece comprising:
- a unitary housing;
- a first portion communicating with said housing and adapted to be inserted into a user's mouth;
- said unitary housing comprising:
- an entrance port for admitting breathable gas into said housing;
- a first exit port for exhausting gas from said housing into an ambient environment;
- a second exit port for exhausting gas from said housing into a flow channel;
- and
- a valve means located in said housing operable to selectively direct the exhaust gas to said first exit port or said second exit port, said valve means comprising a rotatable valve comprising a block having a portion facing said entrance port and having a first relatively large diameter bore hole perpendicular to a major axis of the valve and a second relatively large diameter bore hole extending from the portion of the valve facing the entrance port to enable communication with said first bore hole.
5 more elements
A breathing apparatus comprising:
- a mouthpiece;
- a counterlung;
- a carbon dioxide removal device;
- a path for flowing gas from said mouthpiece to said counterlung and said carbon dioxide removal device and back to said mouthpiece;
- and
- a second circuit comprising:
- a supply of breathable gas;
- a manual override valve;
- and
- a second path for flowing gas from said supply of breathable gas through said manual override valve to said first circuit;
- wherein said mouthpiece comprises:
- a unitary housing;
- a first portion directly coupled to said housing and adapted to be inserted into a user's mouth;
- an entrance port for admitting breathable gas into said housing;
- a first check valve associated with said entrance port and located in said unitary housing;
- a first exit port for exhausting gas from said housing into an ambient environment;
- a second exit port for exhausting gas from said housing into a flow channel;
- a second check valve associated with said second exit port and located in said unitary housing;
- and
- a valve means located in said housing to selectively direct the exhaust gas to said first exit port or said second exit port.
17 more elements
A breathing apparatus comprising:
- an inhale port, a first exhale port, a second exhale port and a manually operable control valve operatively connected to selectively enable exhalant to be exhaled through either said first or second exhale port;
- said control valve comprising a rotatable valve which fits sealingly into a hole bored in said mouthpiece, said valve having an axis disposed parallel to an axis of said inhale port;
- said rotatable valve comprising a lock having a portion facing said inhale port and having a first relatively large diameter bore hole perpendicular to the axis of the valve and a second relatively large diameter bore hole extending from the portion of the valve facing the inhale port to enable communication with said first bore hole.
A low breathing resistance mouthpiece for a breathing apparatus, said mouthpiece comprising:
- a unitary housing;
- a member directly coupled to said unitary housing and adapted to be inserted into a user's mouth;
- said unitary housing comprising:
- a first entrance port for enabling a user to draw breathable gas into said housing from a flow channel;
- a second entrance port adapted to admit pressurized breathable gas into said housing;
- a first exit port for exhausting gas from said housing into an ambient environment;
- a second exit port for exhausting gas from said housing into a flow channel;
- and
- valve means operable to selectively enable breathable gas to be admitted into said housing from both of said first and second entrance ports or only said second entrance port;
- and to thereupon direct exhaust gas to said second exit port when said gas is admitted from said first and second entrance ports, and to said first exit port when said gas is admitted from only said second entrance port.
7 more elements
Dependencies are inferred from the claim text.