Electrical cord set having a magnetically identifiable conductor, and a method of automatically manufacturing such a cord set
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United States of America Patent
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Sep 24, 1985
Issued Date -
N/A
app pub date -
May 23, 1984
filing date -
Mar 30, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric cord set having a plurality of stranded conductors and a connection plug with an identifying connection element, such as a grounding pin, the identified connection element being connected to a conductor identified by having a higher magnetic permeability than the other conductors. Preferably, the ground wire is made of wire strands similar to the other conductors, but contains 1 to 3 auxiliary steel wire strands. In a method and device for manufacturing such a cord set, the cord is arranged next to a magnetic sensing element and rotated about the cord axis automatically while the permeability is sensed. The cord is then fixed in a position of highest or lowest detected permeability, so as to identify the location of the unique conductor, and the plug is then connected.
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