Hand pump for pumping air of lower pressure and high pressure
US5779457A · kind A · utility
27Cited by
5References
6Claims
0Family size
Inventors
Key dates
| Filing date | Apr 29, 1997 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Apr 29, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B33/005
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hand pump includes a cylindrical member having a cap secured on top and a cover securing the cap to the cylindrical member. A large piston is slidably engaged in the cylindrical member and a barrel secured to the large piston. A small piston is slidably engaged in the barrel for pumping air into the cylindrical member and the cover. The small piston may pump a low air pressure when the barrel is not secured to the cylindrical member and may pump a high air pressure when the barrel is secured to the cylindrical member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.