Mtd Southwest, Inc.

Ryobi North America, Inc.

James M Grayson

Katsumi Kurihara

Shiro Kawamoto

A power tool having a rotary implement driven by a four-cycle engine. The engine crankcase is through a passageway which extends through a camshaft to a valve chamber. The rotating shaft member inhibits the escape of lubricating oil when the engine is running while permitting a lubricating oil mist to circulate through the engine.

Multi-position, operator-carried, four-cycle engine

A power tool having a rotary implement driven by a four-cycle engine. The engine crankcase is vented via an axial passageway which extends through at least one cam shaft axial shaft of the crankshaft and cam shaft. The rotating shaft member inhibits the escape of oil when the engine is running due to centrifugal force.

Growing community of inventors

Wonder Lake, IL, United States of America

James M Grayson