Chain saw
US4534005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1982 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | May 10, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16N2013/066
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A chain saw including an electromagnetic pump (4) for feeding lubricant to saw chain operative in response to an engine speed sensor (5) for sensing the rpm of an internal combustion engine and a microcomputer (6) for controlling the operation of the electromagnetic pump (4). The microcomputer (6) stores a plurality of lubricant feeding patterns covering the number of actuations of the electromagnetic pump (4), the actuation frequency and the period of time of each actuation so as to control automatically the feeding of lubricant to the saw chain from the electromagnetic pump (4) in response to the engine speed sensor (5) to effect lubricant feeding in conformity with the sawing condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.