US3736973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radial tires having a sidewall-stiffening structure
Assignee: Pirelli and C SpA
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Filing: 1972-03-06
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Granted: 1973-06-05
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Expires: 1992-03-06
Abstract
Abstract A pneumatic tire is disclosed having improved sidewall flexibility by using a reinforcing structure between the bead zone comprised of at least two strips of textile cord sandwiching a strip of metal cord. The angle formed between the textile cord strips and the circumferential line of the tire is 15* to 40* and the textile cords are parallel to one another. The metal cords are also parallel to one another. The angle formed between the metal cord strip and the tire''s circumferential line is from 2* to 10* greater than the angle between the textile cords and the circumferential line. The angle of inclination of the metal cord strip is in a direction opposite to the textile cord strips.
Inventors
- 👤 M Mezzanotte
- 👤 F Carretta
- 👤 G Turchetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; B60C15/0603; B60C15/0607; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10837; Y10T152/10846; Y10T152/10855; Y10T152/10864
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
247 words
A pneumatic tire for vehicle wheels comprising two beads each containing a bead core, a carcass constituted by textile cords lying in radial planes or forming small angles with said planes, wherein said cords extend from one bead to the other of the tire and are turned up about the bead cores contained in said beads in a direction from the inner side toward the outer side of the tire, each bead comprising a filler of hard rubber arranged on the bead core and extending toward the lower zone of the sidewall of said tire, the bead zone and the lower sidewall zone comprising a reinforcing structure which is disposed in an axially outer position with respect to said carcass, said reinforcing structure comprising at least two strips of textile cords having a strip of metal cords sandwiched therebetween, said textile cords being parallel to one another and inclined in a single direction with respect to the circumferential lines of said tire, said metal cords also being parallel to one another and inclined in a direction opposite to that of said textile cords, the angle formed by said textile cords with the circumferential lines of said tire ranging from 15* to 40*, the angle formed by said metal cords with the circumferential lines of said tire being greater than the angle formed by said textile cords with the circumferential lines of said tire and the difference between the values of said angles ranging between 2* and 10*.
Claim 2
Dependent Claim
247 words
A pneumatic tire for vehicle wheels comprising two beads each containing a bead core, a carcass constituted by textile cords lying in radial planes or forming small angles with said planes, wherein said cords extend from one bead to the other of the tire and are turned up about the bead cores contained in said beads in a direction from the inner side toward the outer side of the tire, each bead comprising a filler of hard rubber arranged on the bead core and extending toward the lower zone of the sidewall of said tire, the bead zone and the lower sidewall zone comprising a reinforcing structure which is disposed in an axially outer position with respect to said carcass, said reinforcing structure comprising at least two strips of textile cords having a strip of metal cords sandwiched therebetween, said textile cords being parallel to one another and inclined in a single direction with respect to the circumferential lines of said tire, said metal cords also being parallel to one another and inclined in a direction opposite to that of said textile cords, the angle formed by said textile cords with the circumferential lines of said tire ranging from 15* to 40*, the angle formed by said metal cords with the circumferential lines of said tire being greater than the angle formed by said textile cords with the circumferential lines of said tire and the difference between the values of said angles ranging between 2* and 10*.
Claim 3
Dependent Claim
61 words
The pneumatic tire of claim 1 wherein said reinforcing structure extends in the lower portion of the sidewall up to a height defined between 25 and 45 percent of the tire section height, said strip of metal cords extends to a radially outermost portion with respect to said strips of textile cords, for a length which does not exceed 30 mm.
Claim 4
Dependent Claim
49 words
The pneumatic tire of claim 1 wherein at least the radially outermost portion of said reinforcing structure is axially inserted between two hard rubber structural shapes, with structural shapes extending to a radially outermost portion with respect to said structure, for a length ranging between 3 and 30 mm.
Claim 5
Dependent Claim
67 words
The pneumatic tire of claim 3 wherein a strip of low hardness rubber is inserted at the radially outermost portion of said reinforcing structure between the axially innermost hard rubber structural shape and said carcass, the cross section of said strip having a length between 15 and 50 mm and the midline thereof being positioned at the height of the radially outermost portion of said reinforcing structure.
Claim 6
Dependent Claim
101 words
The pneumatic tire of claim 4 wherein said reinforced structure is axially positioned between said carcass and the hard rubber filler situated on the bead cores, the strips of textile cords of said structure being turned up about said bead cores from the inside toward the outside and continuing their travel toward the lower portion of the sidewall to a height radially comprised between the turn-ups of said carcass and the radially outermost ends of said reinforcing structure and wherein the strip of metal cords is not turned up about said bead cores but terminates at the height of the latter.
Claim 7
Dependent Claim
79 words
The pneumatic tire of claim 4 wherein said reinforcing structure is positioned axially between the hard rubber filler situated on said bead cores and the turn-ups of said carcass, the strips of textile cords of said structure are turned up about the bead cores from the outside toward the inside and terminate in the bead zone and wherein said strip of metal cords is not turned up about said bead cores but terminates at the height of the latter.
Claim 8
Dependent Claim
33 words
The pneumatic tire of claim 5 wherein a hard rubber strip is situated in an axially outermost position and extends from the bead base to a height radially outermost from said reinforcing structure.
Claim 9
Dependent Claim
33 words
The pneumatic tire of claim 6 wherein a hard rubber strip is situated in an axially outermost position and extends from the bead base to a height radially outermost from said reinforcing structure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |