Power tool anti-kickback system with rotational rate sensor

Details Power tool anti-kickback system with rotational rate sensor Power tool anti-kickback system with rotational rate sensor

2006-09-12

2009-06-30

Nash, Brian D (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

C173S004000, C173S006000, C173S001000

Reexamination Certificate

active

07552781

ABSTRACT:
A control system is provided for use in a power tool. The control system includes: a rotational rate sensor having a resonating mass and a controller electrically connected to the rotational rate sensor. The rotational rate sensor detects lateral displacement of the resonating mass and generates a signal indicative of the detected lateral displacement, such that the lateral displacement is directly proportional to a rotational speed at which the power tool rotates about an axis of the rotary shaft. Based on the generated signal, the controller initiates a protective operation to avoid further undesirable rotation of the power tool. The controller may opt to reduce the torque applied to shaft to a non-zero value that enables the operator to regain control of the tool.

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