Shut-down device for engine of portable working machine
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United States of America Patent
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Issued Date -
Oct 11, 2007
app pub date -
Apr 4, 2007
filing date -
Apr 6, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An engine shut-down device, which protects a portable working machine from static electricity discharge damage, is provided. In the portable working machine, engine operation can be stopped by switching or forcing a short-circuit at a primary coil in the ignition unit of the engine. The engine shut-down device, includes a manually operable ON/OFF switch for switching or forcing the short-circuit, and an conductive ground-mounting plate that is interposed between a switch operating member and a main switch body. The ground-mounting plate is electrically grounded at a designated electric grounding portion of the engine. Static electricity accumulated in the working machine can discharge via a path running directly from the ground-mounting plate to ground avoiding harmful passage through the ignition unit.
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