Tensioning arrangement for a saw chain

US5491899A · kind A · utility

Assignee

• Stihl Andreas

Inventors

• Harald Schliemann · Waiblingen, DE
• Rudolf Krebs · Wendeburg, DE
• Werner Geyer · Newton, US
• Hans-Ulrich Nickel · Neubiberg, DE
• Helmut Zimmermann · Winnenden, DE

Key dates

• Filing date: Aug 29, 1994
• Grant date: Feb 20, 1996
• Expiry date: Aug 29, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T83/7239
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to a tensioning arrangement for a saw chain of a motor-driven chain saw. The saw chain runs on a guide bar mounted on the motor housing of the chain saw. The tensioning arrangement includes a rotatable disc having a spirally-shaped guide slot in which a lug of a slide piece engages. The longitudinal displacement of the guide bar is provided by rotating the disc. The guide slot in the disc extends over a rotational angle of at least 270.degree.. A still lesser slope of the guide slot is provided with a rotational angle in the range of 360.degree. to 450.degree.. The tensioning arrangement is especially suitable for adjusting the guide bar in motor-driven chain saws thereby adjusting the tension in the saw chain.