Oil pump
US4801253A · kind A · utility
9Cited by
13References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1986 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Oct 31, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27B17/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Instead of a hand-operated oil pump for supplying extra oil to the chain of a motor saw, two pumps according to the invention are disposed on the same shaft. The first one works always, while the second one can be switched on and off. The switching is effected by choking the feed of oil partly or completely to the second one. Both the pumps are controllable by decreasing the piston stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.