Silencer, especially for portable motor chain saws

US4142607A · kind A · utility

Assignee

• Firma Andreas Stihl AG & Co. · DE

Inventors

• Goetz Landwehr · Winnenden, DE
• Helmut Lux · Winnenden, DE
• Karl-Heinz Duemmel · Loßburg, DE

Key dates

• Filing date: Sep 23, 1977
• Grant date: Mar 6, 1979
• Expiry date: Sep 23, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2590/06
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Disclosed is an exhaust silencer suitable for use with portable combustion engines, and particularly for use with chain saw engines, comprising a chamber having an inlet and outlet for receiving the engine exhaust; means disposed about the chamber outlet for reducing the kinetic energy of the exhaust flowing therethrough; and an air duct means mounted exteriorly of the chamber below the chamber outlet for cooling the chamber, the kinetic energy reducing means, and the exhaust gas by contact with a stream of ambient air flowing therethrough.