| 摘要 |
A hand tool having a motor-operated shaft that drives a saw, the motor being rendered operable when pressure is applied to a trigger while a tool-manipulating handle is being grasped. Said tool is provided with a magnetic brake that comprises an electro-magnetic coil affixed to the housing of the tool and an armature normally biased away from the coil carried by and rotatable with the shaft, the coil remaining de-energized during operation of the shaft and saw. Said actuator, upon release of the trigger, shifting a switch to cause de-energization of the motor and energization of the electro-magnetic coil to produce a magnetic field effective on the armature to draw it into braking engagement with a brake lining provided adjacent the coil.
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