Patent ID: 6111515
Filing Date: 2000-08-29
Classification: B25D,B25F,Y10T

Abstract:
A method of preventing accidents caused by blockage of a rotatable tool when working with a hand-held tool including the rotatable tool (8), a drive motor (7) for driving the rotatable tool (8), and means (5, 6) for interrupting transmission of a drive torque from the drive motor (7) to the rotatable tool (8) dependent on an operational condition of the hand-held tool, the method comprising the steps of determining the operational condition of the hand-held tool by measuring displacement of the hand-held tool in space in at least two points of the hand-held tool spatially spaced from each other and spaced from a tool axis; subtracting two obtained displacement measurement variables (a.sub.1, a.sub.2) from each other, and thereafter, calculating an actuation signal that actuates the interrupting means (5, 6).