Claims
- 1. A steel cord for reinforcing rubber, which comprises a number between 3 and 27 of wires twisted at a regular pitch P between 5 and 20 mm in the same direction, each of said wires having a diameter d between 0.1 and 0.4 mm,
- a number between 1/4 and 2/3 of the total number of said wires, each having a preformed lengthwise spiral form in small curl at a pitch between 0.1P and 0.7P, the spiral diameter being between d+2/100 and d+2/10 mm, such that the spiral wires repeatedly contact at intermittent points and are spaced from adjacent wires at locations between said intermittent points.
- 2. The cord of claim 1, having a diameter between 1.01S and 1.50S, wherein a steel cord formed entirely of straight wires, each wire having the same diameter, has an overall diameter and S represents said overall diameter.
- 3. The cord of claim 1, comprising 3 through 7 twisted strands, each strand consisting of the cord of claim 1, wherein the number n of wires is 3 through 7.
- 4. A cord of claim 1, wherein the stretch of said cord under a load of 5 kg is between 0.10 and 0.40%.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2-158372 |
Jun 1990 |
JPX |
|
2-102286[U]JPX |
Oct 1990 |
JPX |
|
Parent Case Info
This is a continuation of U.S. application Ser. No. 07/708,778, filed May 29, 1991, now abandoned.
US Referenced Citations (26)
Foreign Referenced Citations (20)
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Continuations (1)
|
Number |
Date |
Country |
Parent |
708778 |
May 1991 |
|