Low profile frame for a filter incorporating a negative pressure check mechanism
US9095800B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 2013 |
| Grant date | Aug 4, 2015 |
| Priority date | — |
| Expiry date | Sep 27, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2271/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A low-profile filter frame is disclosed for maintaining an open filter plenum configuration during normal operation, and for enabling quick and reliable negative pressure testing. The frame has upper and lower halves. A breathing tube in the lower half connects to a respirator port. The upper and lower halves snap together to maintain the structure in an assembled configuration. The halves also include features that bias the halves apart when the device is in the assembled configuration, thereby maintaining the breathing tube open. To perform a fit test, a force is applied to an outer surface of the upper half, which moves the halves together, in opposition to the bias, so that the upper half seals against the breathing tube. The frame can be provide in as a single-piece, with a living hinge connecting upper and lower halves, or the upper and lower halves can be separate pieces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.