Fluid pump
US5083906A · kind A · utility
Inventor
Key dates
| Filing date | Sep 11, 1990 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Sep 11, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B43/073
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
This invention relates to an improved gas-driven pump for pumping products, such as beverage syrups. A piston is mounted to a piston shaft for reciprocal movement within a housing. Cavities corresponding to the piston are alternately vented and pressurized to intake the product into a first chamber and to drive the piston to pump the product. A valve stem is included within the housing and is adapted such that the piston performing intake and exhaust strokes moves the valve stem between intake and exhaust positions. A valve body is disposed about the valve stem which is also movable between two positions for alternately venting and pressurizing a second chamber. The valve stem which is operable to move the valve body is biased toward the intake or exhaust position by an overcenter spring disposed within the second chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.