Compact manual air pump having selectable high volume and high pressure modes
US6027319A · kind A · utility
25Cited by
1References
3Claims
0Family size
Inventors
Key dates
| Filing date | Apr 21, 1997 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Apr 21, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B33/005
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump comprises a pair of coaxial pistons, one slidably positioned in the other for simultaneous compression causing similarly directed air flow, independent passages and valves for permitting air flow from each piston into the pump head for increased air flow, and a switching device for selectively opening one passage to ambient to decrease the air flow into the pump head. The pump thus has two modes, namely a high volume mode when the two pistons operate simultaneously to direct combined air flow and a high pressure mode when the passage is opened to ambient to direct air flow from only one of the two pistons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.