US4180116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radial tires
Assignee: Pirelli Tyre SpA
•
Filing: 1977-12-14
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Granted: 1979-12-25
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Expires: 1997-12-14
Abstract
Abstract A radial carcass motor vehicle tire having a cross-section in which the ratio of the section height/overall width is less than 1 and preferably not greater than 0.7 and which is intended to be mounted on a rim provided with bead-seats inclined at an angle of 15° with respect to the rotation axis, is provided with a bead-wire core around which the extremity of the carcass ply or plies, is turned-up from the inside towards the outside. The bead-wire cores are formed of rubberized metallic wires, wound spirally so as to present a polygonal cross-section elongated in the axial direction. The base of the core is inclined at an angle of 15° with respect to the rotation axis. The bead-core has an irregular geometrical section, having its bary-center axially shifted to the outside with respect to the line of the mid-plane of the bead-core base from between 7% to 30% of the axial width of the bead-core base.
Inventors
- 👤 Luigi Maiocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:57
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/04; G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0896; G03G15/65; G03G15/6529; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10837; Y10T152/10846
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
In a radial carcass tire having a section of a ratio H/C that is not greater than 0.7, and which is intended to be mounted onto a rim provided with bead-seats inclined at an angle of 15° with respect to the rotation axis, said tire presenting beads, each of which comprises a bead-wire core around which, from inside towards outside, the extremity of the carcass ply or plies is turned-up, said bead-wire cores being consitituted of rubberized metallic wires wound spirally to present a polygonal cross-section elongated in the axial direction, and in which the side constituting the bead-core base, is inclined at an angle of 15° with respect to the said rotation axis, the improvement wherein said polygonal cross-section has an irregular geometrical figure consisting of two associated polygons, said figure having its bary-center axially shifted to the outside, with respect to the line of the mid-plane of the bead-core base, between 7% and 30% of the axial width of the said bead-core base.
Claim 2
Dependent Claim
165 words
In a radial carcass tire having a section of a ratio H/C that is not greater than 0.7, and which is intended to be mounted onto a rim provided with bead-seats inclined at an angle of 15° with respect to the rotation axis, said tire presenting beads, each of which comprises a bead-wire core around which, from inside towards outside, the extremity of the carcass ply or plies is turned-up, said bead-wire cores being consitituted of rubberized metallic wires wound spirally to present a polygonal cross-section elongated in the axial direction, and in which the side constituting the bead-core base, is inclined at an angle of 15° with respect to the said rotation axis, the improvement wherein said polygonal cross-section has an irregular geometrical figure consisting of two associated polygons, said figure having its bary-center axially shifted to the outside, with respect to the line of the mid-plane of the bead-core base, between 7% and 30% of the axial width of the said bead-core base.
Claim 3
Dependent Claim
76 words
The tire of claim 1 wherein one of said two associated polygons is an irregular polygon having at least five sides, the longest side of which is the bead-wire core base, the other polygon being a regular trapeze, the longest base of which coincides with the side of the said irregular polygon that lies adjacent to the base of the said bead-wire core, on the side that is in outwardly axial position at the bead heel.
Claim 4
Dependent Claim
70 words
The tire of claim 1 wherein one of said polygons is an irregular polygon having at least five sides, the longest side of which is the bead-core base, and the other polygon being an isosceles triangle, the base of which coincides with the side of the said irregular polygon that is adjacent to the said bead-wire core on the side that is an outwardly axial position at the bead heel.
Claim 5
Dependent Claim
24 words
The tire of claim 1 wherein the said bead comprises a reinforcing element placed in an outwardly axial position of the said bead-wire core.
Claim 6
Dependent Claim
87 words
The tire of claim 1 wherein the said bead comprises, in the radially outward position with regard to the said bead-wire core, a triangular rubber filler, constituted by the association of two lenticular profiles, the axially outer one consisting of a rubber compound having a Shore-A hardness between 70° and 80°, and the axially inner profile consisting of a rubber compound having a Shore-A hardness between 55° and 70°, said inner profile extending at the maximum, up to one-half of the height of the said tire section.
References Cited (Backward Citations)
US2292980A
Cited
US3861442A
Cited
US3949800A
Cited
DE2458923A1
Cited
US3964533A
Cited
US4076066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |