Changeover valve and dual air supply breathing apparatus
US7082944B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2003 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Sep 10, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87812
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A dual air supply breathing apparatus that allows a user to quickly and easily switch between two or more sources of air or compressed gas, such as filtered air from a Powered Air Purifying Respirator (PAPR) and compressed air from a Self-Contained Breathing Apparatus (SCBA). In one variation, the dual air supply breathing apparatus uses a Y-shaped changeover valve with two input tubes and one output tube. The first input tube receives filtered air from a PAPR and the second input tube receives compressed air from a tank. An actuator controls a flap valve within the changeover valve to seal off one of the input tubes while creating a flow path between the other input tube and the output tube. The changeover valve may be controlled by manipulating the high-pressure valve on the tank of compressed gas and/or by manipulating the switch that activates the PAPR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.