Safety arrangement for a saw chain of a power-driven chain saw

US4554853A · kind A · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Karl Nitschmann · Schorndorf, DE
• Hans Dolata · Waiblingen, DE
• Gunter Dietzsch

Key dates

• Filing date: Oct 12, 1983
• Grant date: Nov 26, 1985
• Expiry date: Oct 12, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T83/925
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to a safety arrangement for a saw chain which includes cutting links. A first safety mark is formed in the outside surface of the upwardly-extending portion of the rearmost wall of the cutting link. This first safety mark is disposed at a predetermined distance from the trailing edge of the cutting link and extends in a direction substantially parallel thereto. A second safety mark is formed in the wall of the depth limiter and extends from the leading edge of the cutting link to a notch between the depth limiter and the cutting tooth. The second safety mark is disposed at a predetermined distance below the engaging edge of the limiter. The first safety mark defines the rearmost position to which the blade and the upwardly-extending portion of the cutting tooth can be safely worn provided that the engaging edge of the depth limiter has not been worn down to an elevation below the second safety mark whereby the marks provide positive visual indications to an operator when further use of the saw chain would be unsafe.