B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
341/91
B23B 45/02 (2006.01) B23B 47/00 (2006.01) G05D 13/62 (2006.01) H02P 25/14 (2006.01)
Patent
CA 1122680
CONTROL DEVICE FOR CONTROLLING THE ROTATIONAL SPEED OF A PORTABLE POWER TOOL ABSTRACT OF THE DISCLOSURE A speed control device for portable power tools having particular applicability to electric drills. The speed control device is adapted to automatically adjust the speed of the motor in accordance with changes in the diameter of the tool bit used. The device includes a sensor that senses the opening and closing of the jaws of the chuck. The sensor is mechanically coupled to a potentiometer circuit whose output signal is varied in accordance with movement of the sensor. The output signal of the potentiometer circuit controls the firing angle of a thyristor 34, which in turn controls the current supplied to the motor. In addition, the preferred embodiment includes a speed select switch which is connected to the potentiometer circuit to set the appropriate speed range for the motor, given the particular type of work material.
344536
Black & Decker Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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