Ferrous metal detector with alarm

Details Ferrous metal detector with alarm Ferrous metal detector with alarm

2007-11-20

2007-11-20

Mackey, Patrick (Department: 3654)

Classifying, separating, and assorting solids

Magnetic

Paramagnetic

C209S223100, C209S215000, C209S636000, C340S551000, C324S234000, C324S239000

Reexamination Certificate

active

11236118

ABSTRACT:
An electronic ferrous metal detector with an alarm includes a non-ferrous core positioned circumferentially about an opening in an object, such as a hole in a garbage can lid. A pick-up coil having a sufficient number of windings is wound about the non-ferrous core for detecting magnetized objects passing therethrough and generating a voltage. The voltage is passed through an op-amp and into a comparator/detector, where a preset reference point is compared to the voltage from the op-amp. Once the voltage passes the preset reference point, the comparator goes to a high output and powers a switch, such as a SCR or Triac, which is gated on and carries the current and feeds the voltage to an alarm that provides an audible or visual signal that a magnetized piece of ferrous material has passed through the metal detector.

REFERENCES:
patent: 3826973 (1974-07-01), Pflaum
patent: 4279744 (1981-07-01), Antonwitsch
patent: 4367138 (1983-01-01), Kustas
patent: 4494657 (1985-01-01), Oldenkamp
patent: 4875567 (1989-10-01), Fitton
patent: 5001425 (1991-03-01), Beling et al.
patent: 5659247 (1997-08-01), Clements
patent: 6833789 (2004-12-01), Carmen et al.
patent: 2002/0067163 (2002-06-01), Goldberg et al.

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