Air fluidized bed
US6574813B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Nov 29, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7836
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pilot operated check valve is configured to be positioned inside a fluid supply tube connected between an air supply manifold and an air zone located on a support surface of abed. The pilot operated check valve includes a body having an air inlet and an air outlet connected by an air passageway. The pilot operated check valve also includes a valve member configured to move between an open position and a closed position to block air flow through the passageway. Additionally, the pilot operated check valve includes a push rod having a first end coupled to the valve member to unseat the valve member when the valve member is in its open position and a second end. The pilot operated check valve includes a diaphragm located in a chamber of the body adjacent the second end of the push rod. The pilot operated check valve further includes an inlet port configured to be coupled to the manifold to admit pressure against the diaphragm. The body is formed to include a vent hole located on an opposite of the diaphragm from the inlet port. The vent hole is formed in communication with the chamber to permit air passing into the chamber from the air passageway to vent to atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.