| 摘要 |
A portable electric tool speed control switch of the trigger actuated type having an adjustable trigger stop that affords selective setting of the maximum speed point to any one of a multiplicity of speed points. The trigger stop is integrally mounted in the trigger and abuts the switch housing to limit trigger depression. A spring-biased plunger pin (16) extends rearwardly through the trigger head (10) toward the housing and an adjusting knob (20) recessed in and rotatably mounted in the trigger head has a notched helical track (20b) that engages a tooth at the head of the pin so that rotation of the knob adjusts the plunger pin to provide a trigger stop by abutting the housing at the selected point of trigger depression thus setting the speed point of the tool and affording returning repeatedly to the same speed point.
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