Stretchable material having redundant conductive sections
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United States of America Patent
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Mar 21, 1989
Issued Date -
N/A
app pub date -
Oct 19, 1987
filing date -
Sep 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stretchable grounding strap for additional reliability in grounding the wearer's body through the use of two or more separate sections of conductive material, each of which is connected to ground by a separate grounding line. Circuitry utilized in connection with the strap senses loss of electrical contact between the strap and ground and provides visual and aural notification that contact is lost, as well as visual notification when the strap is grounded. According to one group of embodiments, the strap utilizes a stretchable material having two or more sections of longitudinally oriented electrically conductive fibers on its inner surface. Face yarns on its outer surface may form letters, words, logos or other pleasing or commercially attractive designs. Elastic yarns allow the material to stretch easily and comfortably. According to another group of embodiments, the strap comprises at least two sections of metal links. One or more clasps, which may be adjustable, are attached to the material, and fittings are mounted on the clasps, one fitting corresponding to each section of conductive material and for receiving one grounding cord.
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