Patent ID: 7669499

Claim:
An arrester device for closing apparatus comprising a worm gear rotationally fixedly connected to an output shaft serving as a winding shaft and a self-locking worm which is in communication with an input shaft, wherein an auxiliary worm gear is seated on an eccentric region of the output shaft with clearance, the eccentric region of the output shaft having an amount of eccentricity, the auxiliary worm gear having the same amount of eccentricity as the eccentric region of the output shaft and the arrester being assembled such that the output shaft and the auxiliary worm gear are concentric about an axis of the output shaft so that the eccentricities of the auxiliary worm gear and the output shaft are cancelled with respect to the axis of the output shaft, with the auxiliary worm gear in communication with the self-locking worm via a toothed region, the toothed region of the auxiliary worm gear and the clearance between the output shaft and the auxiliary worm gear collectively allowing the auxiliary worm gear to follow a movement of the worm gear without load, wherein the auxiliary worm gear is supported against a cylindrical region of a transmission housing on movement of the auxiliary worm out of the concentric position about the axis of the output shaft.