Patent ID: 8193458
Filing Date: 2012-06-05
Classification: B25B,B25F,H01H

Abstract:
1. An electric tool switch comprising: an operation member turnable consecutively in both directions and biased to self-return to a neutral position; a circuit substrate arranged to be orthogonal to a turning shaft of the operation member; a pair of slidably moving elements which is pressed against the circuit substrate and which is turned with the operation member to slidably contact the circuit substrate; and an inversion mechanism for switching a polarity between output terminals according to the turning direction of the operation member from the neutral position; wherein the circuit substrate is formed with two sets of variable resistor circuits, which close a circuit when the slidably moving element slidably contacts and which resistance value changes consecutively according to a contacting position of the slidably moving element, electrically connected in parallel on both sides in the turning direction from a position corresponding to the neutral position of the operation member.