VIBRATION SWITCH AND PORTABLE MOTOR-DRIVEN DEVICE WITH IT

摘要

A vibration switch (10) is constituted by assembling discoid electrodes (11 and 12) having aligned projecting parts (16) on their internal surfaces together at a prescribed interval and putting a spherical body (13) in the space (21) between the electrodes (11 and 12) so that the electrodes (11 and 12) can be electrically connected to each other when the switch (10) vibrates or rolls. A portable motor-driven device provided with such a switch (10) is constituted in such a manner that the switch (10) is attached to a frame (1). When a portable power tool (4) is apt to roll or tilt sideways due to an excessive load while the tool (4) is used to cut a material, the switch (10) is turned on and the power supply to the controller (6) of the tool (4) is interrupted to immediately stop a tool rotating motor (4M) or feeding motor (5M), even though the tool (4) is used at any angle. <IMAGE>