Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-02-21
1977-01-11
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3312
Patent
active
040029662
ABSTRACT:
A method and apparatus for detecting cracks or flaws in flanges on the ends of metal container bodies is disclosed herein. The method contemplates generating a magnetic field by passing a primary alternating current having a substantially constant rms value through an inductor means and moving the flange through the magnetic field while monitoring the rms value of the total current passing through the coil and comparing the magnitude thereof with a reference value. A signal is produced when the differential between the values of the total current and the reference exceeds a certain level. The apparatus consists of holding means for receiving and holding a container and means for rotating the holding means about an axis to expose different portions of the flange to a fixed probe positioned adjacent the flange.
REFERENCES:
patent: 2573824 (1951-11-01), Baker
patent: 2791730 (1957-05-01), Stont
patent: 2860777 (1958-11-01), Ortegren et al.
patent: 3098565 (1963-07-01), Fouse et al.
patent: 3101848 (1963-08-01), Uhlig
Hinds James J.
Stepenske Lawrence D.
Anderson James E.
Corcoran Robert J.
National Can Corporation
Rath Ralph R.
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