Patent ID: 7296683
Filing Date: 2007-11-20
Classification: B65F,G01V

Abstract:
1. An electronic ferrous metal detector for detecting magnetized ferrous metal material passing through an opening in an object, the opening in the object having a center therethrough, comprising: one non-ferrous core positioned circumferentially about the opening in the object for the passage of the magnetized ferrous metal material therethrough; the magnetized ferrous metal material providing a magnetic field in the opening of the object as the magnetized ferrous metal material passes through the opening in the object; one continuous pick-up detector coil having a top portion, the detector coil positioned circumferentially about the opening in the object and wound clockwise about the one non-ferrous core for detecting the magnetic field provided by the magnetized ferrous metal material with only the one pick-up detector coil and generating a voltage as the magnetized ferrous metal material is passed through both the non-ferrous core and through the one clockwise wound pick-up detector coil for detecting the presence of the magnetized ferrous metal material within the opening of the object; a DC Bias voltage source electrically connected to the pick-up detector coil for providing a DC Bias voltage on the pick-up detector coil for increasing sensitivity of the detector coil and adding stability; the clockwise winding of the detector coil and the DC Bias voltage increasing sensitivity to the magnetic field, adding stability, and directing the sensitivity toward the top portion of the detector coil and to the center of the opening in the object; and an alarm electrically coupled to the one pick-up detector coil for receiving the voltage from the one pick-up detector coil and for signaling a person that the magnetized ferrous metal material has passed through the one pick-up detector coil and through the opening in the object for detecting any magnetized ferrous metal material passing through the one pick-up detector coil.