US4258543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal cord
Assignee: Industrie Pirelli SpA
•
Filing: 1979-10-09
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Granted: 1981-03-31
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Expires: 1999-10-09
Abstract
Abstract Metal cord, for reinforcing articles of an elastomeric material, such as tires, conveyor belts and so on of the single strand type, in particular made up of a plurality of 3, 4 or 5 wires, wherein the said wires are twisted together loosely, so as to result as being spaced apart from each other but in such a way that the ratio between the diameter of the circumference circumscribing the swollen cord and the diameter of the circumference circumscribing the corresponding compact cord, is comprised between 1.06 and 1.20. A thus realized cord consents for an optimum penetration of the elastomeric filler material but at the same time a tensile behavior, and in particular an elongation in the field of low values of loads applied, which does not differ in any appreciable way from that of the corresponding compact cord.
Inventors
- 👤 Cesare Canevari
- 👤 Luciano Tarantola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:16
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/062; B; B60; B60C; B60C9/00; B60C9/0007; D07B2201/00; D07B2201/20; D07B2201/2015; D07B2201/2022; D07B2401/00; D07B2401/20; D07B2401/2005; D07B2401/201; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
Cord of the single strand type adapted for the reinforcement of articles of elastomeric material, consisting of 3 to 5 steel wires, individually twisted and helicoidally wound together into a swollen geometric configuration, having a diameter greater than the diameter of the same cord in the compact geometric configuration, characterized by the fact that the ratio between the said diameters is between 1.06 and 1.20.
Claim 2
Dependent Claim
65 words
Cord of the single strand type adapted for the reinforcement of articles of elastomeric material, consisting of 3 to 5 steel wires, individually twisted and helicoidally wound together into a swollen geometric configuration, having a diameter greater than the diameter of the same cord in the compact geometric configuration, characterized by the fact that the ratio between the said diameters is between 1.06 and 1.20.
Claim 3
Dependent Claim
24 words
The metal cord of claim 1, characterised by the fact that the diameter of the individual constituent wires varies between 0.12 and 0.30 mm.
Claim 4
Dependent Claim
14 words
Metal cord of claim 1, characterised by an elongation at rupture not exceeding 4%.
Claim 5
Dependent Claim
18 words
Metal cord in accordance with claim 3, characterised by an elongation at rupture contained between 2.9 and 3.4%.
Claim 6
Dependent Claim
50 words
Metal cord in accordance with claim 1, characterised by the fact that the individual constituent wires are deformed by bending according to a radius of curvature of a value which is lower than the value required to maintain the said wires helicoidally wound together in the corresponding compact geometric configuration.
Claim 7
Dependent Claim
49 words
An elastomeric article reinforced with a cable comprising a plurality of helically wound steel wires with spaces between the wires to provide a cross-section of the cable which is between 1.06 and 1.2 times the cross-section of similarly helically wound wires in which their surfaces are contacting each other.
Claim 8
Dependent Claim
49 words
An elastomeric article reinforced with a cable comprising a plurality of helically wound steel wires with spaces between the wires to provide a cross-section of the cable which is between 1.06 and 1.2 times the cross-section of similarly helically wound wires in which their surfaces are contacting each other.
Claim 9
Dependent Claim
15 words
The elastomeric article of claim 6 which is a pneumatic tire for a motor vehicle.
Claim 10
Dependent Claim
50 words
A coreless multistrand cord of steel wires adapted to reinforce an elastomeric aricle, said steel wires being twisted together and loosely helically wound to form a strand having a cross-section which is 1.06 to 1.2 times the cross-section of a similar strand in which the wires are twisted compactly together.
Claim 11
Dependent Claim
50 words
A coreless multistrand cord of steel wires adapted to reinforce an elastomeric aricle, said steel wires being twisted together and loosely helically wound to form a strand having a cross-section which is 1.06 to 1.2 times the cross-section of a similar strand in which the wires are twisted compactly together.
Claim 12
Dependent Claim
37 words
Metal cord with three wires, in accordance with claim 8, characterised by the fact that the ratio between the diameter of the cord and the diameter of the individual constituent wires is contained between 2.283 and 2.585.
Claim 13
Dependent Claim
37 words
Metal cord with four wires, in accordance with claim 8, characterised by the act that the ratio between the diameter of the cord and the diameter of the individual constituent wires is contained between 2.559 and 2.897.
Claim 14
Dependent Claim
37 words
Metal cord with five wires, in accordance with claim 8, characterised by the fact that the ratio between the diameter of the cord and the diameter of the individual constituent wires is contained between 2.863 and 3.241.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |