Portable gauge for measuring air flow in a papermaking machine
US4991425A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/0826
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring air permeability and boundary air flow for a papermaking fabric, such as a dryer felt. The apparatus includes a housing having an open front end bordered by a lower straight edge. An air flow measuring device, such as an anemometer is mounted in the rear surface of the housing a funnel-shaped deflector directs air entering the open front end of the housing to the anemometer. Air flowing through the anemometer generates an electrical signal in proportion to air flow. The electrical signal actuates a visual display mounted on the housing which provides a visual indication of air flow. A thin blade is mounted at the open front edge of the housing and is adapted to ride along the moving fabric when the apparatus is used. A handle is secured to the upper surface of the housing and extends forwardly of the front end and is adapted to be grasped by an operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.