Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-04-02
1982-08-10
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
56 102, 56DIG15, 324232, 340551, G08B 2100
Patent
active
043440746
ABSTRACT:
Metal detectors having parallel magnetic fields produce signals which vary depending upon the shape and orientation of a metal object passing through the field. An improved metal detector sensor includes a magnet of special configuration having a multi-directional magnetic field resulting in a detector which is insensitive to orientation of the detected metal. One embodiment of the magnet is a pattern of cylindrical poles with the opposing pole central to the cylinder, thus creating a multiplicity of radially extending magnet fields. An alternate embodiment of the invention is an offset pattern of opposite poles which create two groups of fields, each at an angle to the general direction of movement of the material fed into the machine.
REFERENCES:
patent: 3324639 (1967-06-01), Halls et al.
patent: 3523411 (1970-08-01), Waldrop et al.
patent: 3758849 (1973-09-01), Susman et al.
patent: 3889249 (1975-06-01), Bennett, Jr. et al.
patent: 3964042 (1976-06-01), Garrott
patent: 3972156 (1976-08-01), Bennett, Jr. et al.
Bohman Carl E.
Chow Mark K.
Strosser Richard P.
Marquette Darrell F.
Miller Larry W.
Seemar Frank A.
Sperry Corporation
Swann III Glen R.
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