Cutterhead for a vegetation cutter apparatus
US5010649A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | May 14, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D34/4162
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention is directed to a cutterhead for a rotatably-driven vegetation cutter apparatus defining a drive axis about which the cutterhead is rotatably driven. The cutterhead includes a housing adpated to be rotatably driven by the vegetation cutter apparatus about the drive axis and a spool carrying a flexible cutting filament wound thereon with the spool being rotatably journalled in the housing. An indexing device permits an incremental rotation of the spool relative to the housing to pay out incremental lengths of the cutting filament. The indexing device includes a blocking lever pivotally journalled in the housing. The blocking lever has a first lever arm having a switching arm formed thereon and a second lever arm has a redirecting element formed thereon for guiding the cutting filament over the blocking lever. The blocking lever is mounted in the housing so as to be movable between a blocking position wherein the switching arm coacts in dependence upon centrifugal force with switching cams to prevent a rotational movement of the spool with respect to the housing and a release position wherein the switching arm coacts in dependence upon centrifugal force with the switchin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.