Automated dressing unit for a chain saw
US10625354B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2016 |
| Grant date | Apr 21, 2020 |
| Priority date | — |
| Expiry date | Jun 9, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27B17/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An operator operates a throttle lever and by maximizing the extent of said operation, the drive state is initiated, and the crank shaft rotation rate R increases and reaches the maximal value (RC) thereof. Subsequently, the operator operates the dressing operation lever so as to be in a second state at elapsed time (t0) while keeping the extent of the throttle lever operation maximized. Because a microswitch is turned off, the crank shaft rotation rate (R) is controlled in a range of R1<R<R2. By placing the saw chain in contact with a grindstone fixed to the dressing operation lever simultaneously with said action, dressing work is performed. After the microswitch is turned off at elapsed time (t0), the output of an ignition coil is controlled cyclically by a control unit at a cycle (T1+T2) so as to be on (ignition) during period (T1) and off (flame off) during period (T2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.