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US3922841A Expired / Lapsed US ⏱️ 0.0 years remaining

Steel cord

Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1974-07-17
•
Granted: 1975-12-02
•
Expires: 1994-07-17
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Abstract

Abstract A steel cord for reinforcing rubber or plastic goods having a core strand consisting of a plurality of wire filaments, and a plurality of outer strands cabled together around the core strand and each of which consisting of a plurality of wire filaments. The direction of lay of the outer layer of the core strand filaments and the direction of lay of the outer layer of the outer strands are made opposite to each other, and the former direction is same with that of the cabling of the outer strands. The number of the wire filaments constituting the outer layer of the core strand is the same as the number of the outer strands. The lay length of the core strand, the outer strands and of the cabling are so selected that the filaments in the outer layer of the core strand and the corresponding filaments in the outer strands have linear contact over their whole length. Thanks to the linear contact of the filaments, fretting of the filaments is less likely to appear resulting in improvement in fatigue endurance and breaking strength. Adhesion to the rubber or the plastic material is also improved and the overall diameter of the cord can be reduced for a given effective cross-sectional area ratio.

Inventors

  • 👤 Tomoaki Katsumata
  • 👤 Norihisa Matsushima

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 18:30
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/0613; B; B60; B60C; B60C9/00; B60C9/0007; D07B2201/00; D07B2201/20; D07B2201/2095; D07B2201/2097; D07B2201/2098; D07B2401/00; D07B2401/20; D07B2401/2065; D07B2401/207; Y; Y10; Y10S; Y10S57/00; Y10S57/902

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 179 words
In a reinforcing steel cord including a core strand consisting of a plurality of wire filaments, a plurality of outer strands cabled together around said core strand, each outer strand consisting of a plurality of wire filaments, the improvement wherein; said core strand comprises a core filament and an outer layer of filaments, the lay direction of the outer layer of the core strand filaments and the lay direction of the outer strand filaments are opposite to each other, the lay direction of the cabling of the said outer strands is the same as that of the outer layer of said core strand filaments, the number of said filaments constituting said outer layer of said core strand is the same as the number of said outer strands, and the lay length of the core strand, the lay length of the outer strands and the cabling of the outer strands are so selected that the filaments in the outer layer of the core strand and the corresponding filamentS in the outer strands contact each other linearly over their whole length.
Claim 2
Dependent Claim 179 words
In a reinforcing steel cord including a core strand consisting of a plurality of wire filaments, a plurality of outer strands cabled together around said core strand, each outer strand consisting of a plurality of wire filaments, the improvement wherein; said core strand comprises a core filament and an outer layer of filaments, the lay direction of the outer layer of the core strand filaments and the lay direction of the outer strand filaments are opposite to each other, the lay direction of the cabling of the said outer strands is the same as that of the outer layer of said core strand filaments, the number of said filaments constituting said outer layer of said core strand is the same as the number of said outer strands, and the lay length of the core strand, the lay length of the outer strands and the cabling of the outer strands are so selected that the filaments in the outer layer of the core strand and the corresponding filamentS in the outer strands contact each other linearly over their whole length.
Claim 3
Dependent Claim 109 words
A steel cord as claimed in claim 1, wherein the number of said filaments in the outer layer of the core strand and the number of said outer strands is m and the number of the filaments in the outer layer of the outer strand is n, respectively, the angle of lay of the cabling of the outer strands with respect to the axial direction of the cord is theta , and wherein the lay length A of said outer layer of said core strand, the lay length B of the outer layer of the outer strand and the lay length C of said cabling satisfies the following equation:
Claim 4
Dependent Claim 33 words
A steel cord as claimed in claim 2, wherein m and n equal 6 and 4, respectively, and the lay length A, B and C are so selected as to satisfy the equation:

References Cited (Backward Citations)

US3352098A Cited
US3391530A Cited
US3834149A Cited
US3778993A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-12-01 1979-06-02 1979-12-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-12-01 1983-06-02 1983-12-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-12-01 1987-06-02 1987-12-02 $7700.00 Window Closed / Lapsed

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