Liquid dispensing system with improved sealing augering screw and method for dispensing
US5971227A · kind A · utility
79Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 11, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | May 11, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C5/0225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid dispenser has an augering screw that serves both a metering function and a valving function. The augering screw is axially movable between a position in which fluid can flow and a sealing position in which liquid flow through the nozzle is substantially prevented. The screw is preferably designed with a curved contour between the threads and with a plurality of thread-defining channels to allow liquid to fill more completely around the screw and to dispense more liquid with fewer screw turns than prior screw designs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.