Pressure display for self contained breathing apparatus
US6032664A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1996 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | May 22, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63C11/22
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A self contained breathing apparatus has a display of air pressure within the face mask in the field of vision of the user of the breathing apparatus. The display is four lights that indicate the four quarter-tanks of pressure, and the lights change to indicate the amount of air remaining. A transducer receives tank pressure and provides an electric signal. The air pressure is placed on a bourdon tube which rotates a disk in response to changes in pressure. One half of the disk includes a gradient, and a light source emits light through the gradient to be received by a light sensor. As the disk rotates, the gradient varies the amount of light received by the sensor, so the electrical output of the sensor varies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.