Apparatus for continuous supply of fine powder, viscous fluid or the like at a constant rate
US4836417A · kind A · utility
13Cited by
3References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 29, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Aug 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D7/0605
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for continuously supplying fine powder at a constant rate comprises a hopper for holding the fine powder, a first piezoelectric transducer disposed on the diaphragm for supplying vibration to cause discharge of the fine powder therefrom, a second piezoelectric transducer for detecting change in the frequency of vibration of the hopper with change in the amount of fine powder contained in the hopper and feeding the detected signal back to a driver for the first piezoelectric transducer so as to supply vibration to the hopper at a frequency determined on the basis of the amount of fine powder contained in the hopper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.