Design and Development of Electric Starting Chain Saws 670744

Hand cranking of engines on chain saws and similar portable tools is a chore due to factors inherent in the construction and make-up of these high compression, two-cycle engines. Therefore, preliminary investigations were undertaken to develop a practical “self-starter” for chain saws and similar applications. These are described briefly.
The recent influx of Japanese motorcycles with electric starting led to a re-evaluation of electric starting systems and their adaptation to portable tools.
This paper views design specifications that had to be met in order to come up with a suitable electric starting system. Discussed in detail are the development of the four sub-systems -- the starter-generator, battery pack, de-stroking valve, and regulatory assembly -- that had to be welded into a workable unit.
The primary advantages of electric starting are the elimination of manual effort, increased productivity, and most important, safety of the individual operator.


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