Patent ID: 7938194
Filing Date: 2011-05-10
Classification: B25F,Y10T

Abstract:
1. A control system for a power tool having a motor drivably coupled to a rotary shaft to impart rotary motion to the shaft about a rotational axis of the tool, comprising: an inertial mass comprised of a solid cylindrical body disposed in a housing of the power tool, the inertial mass being freely rotatable about an axis of rotation during operation of the tool and the axis of rotation being aligned askew with the rotational axis of the tool; at least one sensing element in fixed relation to the housing of the power tool and configured to detect rotational motion of the housing in relation to the inertial mass; and a controller electrically connected to the at least one sensing element and operable to initiate a protective operation based on the detected rotational motion of the housing in relation to the inertial mass.