| 摘要 |
A trigger control switch with speed control having a lock-on button on the side thereof is provided with a tab or protrusion extending radially outwardly of the lock pin, a slot is provided extending longitudinally of the lock barrel and a compression spring surrounding the lock pin within the lock barrel has one end portion thereof torsionally engaged with the lock barrel and the other end portion thereof engaged with the lock pin to bias the tab or protrusion out of alignment with the slot to prevent inadvertent depression of the lock pin while enabling an operator to rotate the tab or protrusion into alignment with the slot and thereafter depress the lock pin to provide lock-on effectuation.
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