Rotatably driven cutterhead for a vegetation cutting apparatus

Details Rotatably driven cutterhead for a vegetation cutting apparatus Rotatably driven cutterhead for a vegetation cutting apparatus

1990-06-22

1991-02-05

Watts, Douglas D.

Cutlery

Cutting tools

With blade moving means

30347, B26B 700

Patent

active

049893211

ABSTRACT:
The invention relates to a rotatably driven cutterhead for a vegetation cutter apparatus. The cutterhead includes a housing in which a spool for the cutting filament is rotatably journalled so as to be rotatable relative to the housing. Switching stops are provided which coact with the spool. Latching levers are pivotally mounted in the housing which each have a latching arm which coacts with the switching stops in dependence upon centrifugal force in such a manner that the spool is first in a latched condition and is then in a freely rotatably condition with correspondingly higher centrifugal force. A predetermined length of filament is unwound in the freely rotatably condition of the spool. The latching arm pivots between an outer release position and an inner latching position and is resiliently biased by a spring in the direction of its latching position. A curved guideway is provided for positively guiding the latching arm out of its outer release position into its inner latching position in which the latching lever coacts with inner latching cams to hold the spool in its latched condition. The curved guideway extends inwardly with respect to the drive axis for positively guiding the latching lever from the release position into the latching position. This assures a reliable automatic switching which requires no intervention by the operator such as supplying additional fuel to the engine or otherwise.

REFERENCES:
patent: 4607431 (1986-08-01), Gay
patent: 4651421 (1987-03-01), Zerrer
patent: 4866846 (1989-09-01), Hoffman et al.
patent: 4897923 (1990-02-01), Collins

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