Inflation stem with blow-off valve to prevent overinflation
US7404412B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 3, 2007 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Oct 3, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/3709
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An inflation stem having an inflation valve combined with a blow-off valve to prevent overinflation. The valves are forced open during inflation when the actuating pin is depressed by the compressor chuck head, opening a fill chamber through which fluid flows into an inflatable object, and also opening a blow-off chamber. A blow-off intake allows lower pressure fluid from the interior of the object to enter the blow-off chamber. The fluid entering the blow-off chamber is isolated from the high pressure fluid coming in from the compressor through the fill chamber by a separation fin and shield joined to the bottom end of the actuating pin. A blow-off gasket is biased upward by a blow-off spring. But as pressure in the object and the blow-off chamber increases, the blow-off gasket is forced down, until at the predetermined pressure it is pushed past a blow-off port, through which fluid then escapes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.