Mouthpiece valve for escape breathing apparatus
US4090511A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1977 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Mar 23, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63C2011/125
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A valve housing has a mouth port in one side and a vent opening in its opposite side, with another opening between them for connection to a carbon dioxide removing and oxygen generating canister. Around the mouth port inside the housing is a valve seat, toward which a valve member is urged by a spring to normally close the valve. Surrounding the valve member and spring is a bellows that has an open end secured to the housing around the vent opening to thereby expose the inside of the bellows to the pressure of water or other liquid in which the valve may be submerged. Connected to the outer end of the mouthport is a mouthpiece adapted to be held in the mouth of a user, and encircling the mouthpiece is a ring that is connected with the valve member for movement with it. The ring normally is so positioned on the mouthpiece that it must be moved toward the housing to permit the mouthpiece to be held in the mouth with the lips against the ring to thereby hold the valve open, but if the mouthpiece is removed from the mouth the spring and fluid pressure inside the bellows will close the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.