Motor-driven chain saw having a lubricating oil pump
US5184403A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1992 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Mar 5, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/263
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention is directed to a motor-driven chain saw having a drive motor which drives a saw chain via a sprocket with the saw chain running around the periphery of the cutter bar in a guide groove formed in this periphery. A brake device is provided to bring the saw chain to standstill which is actuated by a brake lever. In addition, the drive motor continuously drives a lubricating-oil pump which is mounted in a feed line between the supply tank and a outlet opening of the guide groove. The supply of lubricating oil is interrupted when the saw chain is brought to standstill. This is achieved by providing a blocking valve in the feed line which is closed during idle operation of the drive motor and is opened during load operation of the drive motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.