Steel cord for reinforcement of off-road tire, method of manufacturing the same, and off-road tire
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United States of America Patent
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Mar 3, 1998
Grant Date -
N/A
app pub date -
Mar 18, 1997
filing date -
Jun 27, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A steel cord effective for reinforcing a super-large off-road tire wherein strands made by simultaneously twisting together 3 to 6 steel wires in the same twisting direction with the same pitch length are used and the steel cord is made by twisting together 3 to 6 such strands in the same direction as the twisting direction of the strands and with the same pitch length. Each of the steel wires constituting the strands continuously has a small wavy pattern of a pitch length smaller than the lay length of the strands and therefore each of the strands has a compound pattern comprising a wavy pattern formed by the twisting and said small wavy pattern and in a gap is formed between steel wires each of the strands by the small wavy pattern. The lay length P.sub.1 of the steel cord is 8 to 15 times the steel cord diameter D and the elongation on breakage by tension of the steel cord is over 5%.
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