Vibration isolator for a portable power tool

B - Operations – Transporting – 25 – C

Patent

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Details

B25C 1/18 (2006.01) A01D 34/90 (2006.01) B25D 17/10 (2006.01) B25D 17/11 (2006.01) B25F 5/00 (2006.01)

Patent

CA 2165348

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 (54), a starter module (52), and an isolator (58). The clutch housing (54), the starter module (52), and the isolator (58) 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 (54) and the starter module (52) are connected by fasteners (56) extending therebetween, but the fasteners do not penetrate the isolator (58). 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.

On décrit un appareil à moteur portatif comprenant un moteur à combustion interne, un outil de travail entraîné par le moteur, un bras s'étendant entre le moteur et l'outil de travail, un logement d'embrayage (54), un module de démarreur (52) et un élément isolant (58). Le logement de l'embrayage (54), le module du démarreur (52) et l'élément isolant (58) sont disposés dans la section arrière de l'appareil à moteur logeant le bras. L'élément isolant est formé de préférence en un caoutchouc thermoplastique et il est disposé entre le logement de l'embrayage et le module du démarreur. Le logement de l'embrayage (54) et le module de démarrage (52) sont reliés par des dispositifs de fixation (56) s'étendant entre ceux-ci, sans pénétrer dans l'élément isolant (58). Comme l'élément isolant est monté d'une manière non rigide, il amortit efficacement les forces de vibration du moteur arrivant à l'opérateur et évite des sollicitations localisées qui pourraient aboutir à des défaillances prématurées.

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