Importance

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Abstract

A trimmer which can reduce the size of a section including a lubricating oil pump for automatically supplying a lubricating oil to a saw chain during the drive of the saw chain and drive shaft members for driving the saw chain, and secure good mountability of the section. In the trimmer, a gear unit is mounted to the forward end portion of an operating rod, and a gearcase of the gear unit, a mount base and a seal case are mutually connected toward an output shaft. A regenerative pump includes a stirring chamber defined between the mount base and the seal case, and a tabular grooved rotor which is fitted to a drive shaft to be coaxially connected to the output shaft and which is rotated in the stirring chamber in accordance with the rotation of the output shaft. Lubricating oil discharged from the regenerative pump is supplied to a saw chain through a supply port of the mount base, through-holes of the chain bar, through-slots and a guide groove.

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First Claim