Portable, self-powered, adjustable herbicide dispensing system
US4635830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1984 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Nov 29, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B9/0426
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A piston-operated spraying device dispenses a metered amount of liquid. A valve is connected through conduits to a cavity in front of the piston, to a cavity in the rear of the piston, to a pressure supply, to a supply of liquid to be sprayed, to a nozzle, and to a vent for releasing the pressure. In the open position the valve connects the rear cavity to the pressure supply, and the front cavity to a nozzle so that any liquid in the front cavity will be dispensed. In the closed position the valve connects the rear cavity to the vent for releasing the pressure, and the front cavity to the supply of liquid so that a spring can drive the piston to the rear, thereby allowing the front cavity to be filled by the liquid and preparing the device for another delivery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.