Ryobi Outdoor Products, Inc.

Rory B Bringhurst

Lakhbir S Suchdev

Michael Baker

Glenn A Pettet

A motor housing for a string trimmer having a vibration damper disposed between the housing member and the motor. The motor housing has transverse motor support ribs fixedly supporting the motor. A damper chamber is formed in the housing between and end face and an adjacent transverse motor support rib. Stiffner ribs disposed between the end face and the adjacent transverse motor support rib form radial seats on diametrically opposite sides of the motor. A resilient linear vibration damper member is compressively received in each of the damper chambers between the electric motor and the radial seats.

Electric motor mount having vibration damping

A hand held power tool is disclosed comprising an internal combustion engine, a workpiece driven by the engine, a boom extending between the engine and the workpiece, a clutch housing, a starter module, and an isolator. The clutch housing, the starter module and the isolator are disposed in a rearward section of the power tool housing the boom. The isolator is preferably formed of thermoplastic rubber, and is disposed between the clutch housing and the starter module. The clutch housing and the starter module are connected by fasteners extending therebetween, but the fasteners do not penetrate the isolator. Because the isolator is soft mounted, the isolator effectively dampens engine vibration forces to the operator and avoids local stresses which might otherwise lead to premature failure.

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Phoenix, AZ, United States of America

Rory B Bringhurst