Cutterhead for a string trimmer

US5359777A · kind A · utility

Assignee

• Andreas Stihl · DE

Inventors

• Peter Bauer · Nuremberg, DE
• Horst Eckhardt · Auenwald, DE
• Roland Schierling · Marbach am Neckar, DE
• Joachim Hoffmann · Esslingen am Neckar, DE

Key dates

• Filing date: May 20, 1993
• Grant date: Nov 1, 1994
• Expiry date: May 20, 2013

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A01D34/416
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A cutterhead for a string trimmer having a rotatable drive shaft is adapted to hold and meter a cutting filament during operational use thereof. The cutterhead includes a disc-like carrier fixedly connected to one end of the drive shaft to permit the carrier to rotate about a rotational axis. The carrier has a peripheral edge and a peripherally extending outer wall approximately perpendicular to the carrier along the peripheral edge. The outer wall defines a space for accommodating the cutting filament in the cutterhead and has a guide eyelet disposed therein to define a pass-through opening for guiding the filament from the space to the outside of the cutterhead where a segment of the filament extends radially outwardly from the outer wall to define a cutting plane when the drive shaft rotates. The guide eyelet is made of wear-resistant material and is adapted to the diameter of the cutting filament. A stop is disposed in the cutting plane for receiving the segment of the cutting filament thereagainst when the segment strikes an obstacle and is deflected during operation of the string trimmer. The stop is disposed radially forward of the outer wall next to the pass-through opening…