Cutterhead for a vegetation cutter

US4866846A · kind A · utility

Assignee

• Andreas Stihl · DE

Inventors

• Joachim Hoffmann · Esslingen am Neckar, DE
• Josef Karner · Waiblingen, DE
• Dieter Angstenberger · Leutenbach, DE
• Gerhard Zerrer · Bad Marienberg, DE

Key dates

• Filing date: Nov 21, 1988
• Grant date: Sep 19, 1989
• Expiry date: Nov 21, 2008

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A01D34/4162
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The cutterhead includes a cutting filament wound on a spool and this cutting filament is adjusted with respect to its effective cutting length in dependence upon the rotational speed of the cutterhead. The switching point for the automatic feed must be precisely matched to the drive speed in order that the desired effective cutting length is maintained. In order to assure the desired effective cutting length, a spring is provided which is adjustable with respect to its biasing force by means of an easily accessible adjusting member. This biasing force is matched to the speed-dependent centrifugal force such that the spool is released at a predetermined speed of the cutterhead.