Hand-held working tool, especially trimmer or edge cutter
US5774993A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1995 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Oct 25, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01G3/062
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A hand-held working tool has a motor housing and a motor with output shaft positioned in the motor housing. A clutch housing is connected to the motor housing. A centrifugal clutch is positioned in the clutch housing. A drive shaft with a first and a second end is provided. The centrifugal clutch detachably connects the output shaft to the first end of the drive shaft. The centrifugal clutch has fly weights connected to the output shaft and a clutch drum connected to the first end of the drive shaft. This clutch drum surrounds the output shaft and the fly weights. A cutting element is connected to the second end of the drive shaft. A protective tube having a proximal end connected to the clutch housing and a distal end connected to the cutting element is provided. The drive shaft is enclosed in the protective tube. A bearing element is positioned at the first end of the drive shaft. Radial play is provided between the bearing element and the first end of the drive shaft. This radial play is smaller than the distance between the fly weights and the clutch drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.