Komatsu Zenoah Co.

Kamatsu Zenoah Co.

Kazuo Nakajima

Kiyoshi Anbo

Toshiharu Sawada

Hiroshi Miyazaki

Takao Matsunaga

Masaki Kobayashi

Chain saw

Improved apparatus for supplying lubricating oil to the chain of a chain saw powered by an internal combustion engine. A lubricating oil tank is pressurized by communication with the crankcase of the engine, and the pressure forces oil from the oil tank to lubricate the saw chain. An air control valve is disposed in the air passage between the crankcase and the lubricating oil tank, and this valve is selectively operable to adjust the pressurization of the oil tank. The control valve is manually adjustable to adjust the pressurization of the lubricating oil tank, so as to accommodate changes in lubrication caused by factors such as changes in temperature, lubricating oil viscocity, or the like.

Oil supply system

The device is an air intake apparatus for a chain saw. There is a hollow main casing having front and rear ends. A handle extends above the casing. The handle is fixed to the casing. An engine is disposed in the casing. A carburator is disposed in the casing front adjacent to a fuel tank. An oil tank is disposed at the casing rear.

An air cleaner for an engine is provided according to the invention. Said air cleaner comprises openings for communicating with atmosphere provided along a peripheral portion surrounding a suction chamber communicating with a suction port of a carburetor, a filter to cover said openings, a suction path formed along the inside of said openings, a partition wall provided to separate said suction path and said suction chamber, and a communicating path to provide communication between said suction path and said suction chamber so that the suction sound of the engine is prevented by said partition wall from propagating directly to atmosphere and reduced due to interference caused when passing through the long suction path which is located inside the filter, without reducing the area of the path through which suction air passes.

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Tokorozawa, Japan

Kazuo Nakajima