Manually tunable, closed-circuit underwater breathing apparatus
US5485834A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1994 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Aug 10, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B19/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
This invention is a manually tunable underwater breathing apparatus (UBA) which the resonant frequency of the UBA may be adjusted to meet the diver's breathing frequency by controlling the inertance component of the UBA impedance. The principles of the present invention may be adapted to existing UBA by adding a tuning apparatus comprising a valve, a tee and a tuned length of hose. Water displaced by volume change in the breathing bag due to exhalation/inhalation is partly diverted through the valve. Depending on the valve opening set by the diver the inertance and resonant frequency of the UBA can be altered to reduce breathing load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.