Pump devices
US5992944A · kind A · utility
89Cited by
11References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Dec 15, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B9/045
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump device includes main and auxiliary eccentric portions integrated with a motor output shaft on the side of its base end and on the side of its pointed end. The main eccentric portion is larger in diameter than the auxiliary eccentric portion. A needle roller bearing and a ball bearing are fitted to the outer peripheries of the eccentric portions. Main and auxiliary pumps include a pair of plungers which abut on the outer peripheries of the bearings, respectively, and are driven by the main and auxiliary eccentric portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.