A - Human Necessities – 01 – D
Patent
A - Human Necessities
01
D
56/36
A01D 34/416 (2006.01)
Patent
CA 2017124
Abstract of the Disclosure 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 adapted 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 switching cams to release the spool for movement relative to the housing to pay out an incremental length of the filament. The switching arm and the redirecting element are spaced at a peripheral distance from each other so as to cause the first lever arm to be longer than the second lever arm.
Fetherstonhaugh & Co.
Firma Andreas Stihl
Hoffmann Joachim
LandOfFree
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