US3667527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread ring for removable tread tires
Assignee: Industrie Pirelli SpA
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Filing: 1970-06-30
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Granted: 1972-06-06
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Expires: 1990-06-30
Abstract
Abstract A separable tread ring for pneumatic tires which embodies an armor longitudinally resistant to tension, the armor being formed by a helically wound metal cord, the coils of which are disposed generally parallel to the mid-circumferential plane of the tire. Two additional layers of metal cords parallel to each other in each layer are provided, the cords being disposed in two directions crossed relative to the mid-circumferential plane at angles ranging from 10* to 65*. The latter layers are disposed radially inwardly relative to the armor. A third layer of extensible metal cords is positioned radially outwardly of the armor, the cords of such layer being inclined with respect to the mid-circumferential plane at an angle ranging between 10* and 65*.
Inventors
- 👤 Carlo Magistrini
- 👤 Luigi Maiocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:29
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/02; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/10792; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24116
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
201 words
A tread ring for a pneumatic tire of the type in which the tread is separate from the carcass, which comprises an armor resistant to tension in a longitudinal direction, formed by a helically wound metal cord whose coils are disposed in a direction substantially parallel to the mid-circumferential plane of the tire and moreover comprises two additional layers of metal cords parallel to one another in each layer and disposed along two directions crossed with respect to said mid-circumferential plane, and forming with the latter angles ranging from 10* to 65* and is characterized in that said two additional layers are both disposed in a radially innermost position with respect to said armor, and in that said tread ring comprises a third additional layer of extensible metal cords, disposed in a radially outermost position with respect to said armor and inclined with respect to the mid-circumferential plane of the tire at an angle ranging between 10* and 65*, the cords of said third layer being extensible relative to the other mentioned cords in that said third layer cords have an apparent modulus of elasticity not exceeding 3,500 Kg per mm2 at loads smaller than one-tenth of the cord ultimate stress.
Claim 2
Dependent Claim
201 words
A tread ring for a pneumatic tire of the type in which the tread is separate from the carcass, which comprises an armor resistant to tension in a longitudinal direction, formed by a helically wound metal cord whose coils are disposed in a direction substantially parallel to the mid-circumferential plane of the tire and moreover comprises two additional layers of metal cords parallel to one another in each layer and disposed along two directions crossed with respect to said mid-circumferential plane, and forming with the latter angles ranging from 10* to 65* and is characterized in that said two additional layers are both disposed in a radially innermost position with respect to said armor, and in that said tread ring comprises a third additional layer of extensible metal cords, disposed in a radially outermost position with respect to said armor and inclined with respect to the mid-circumferential plane of the tire at an angle ranging between 10* and 65*, the cords of said third layer being extensible relative to the other mentioned cords in that said third layer cords have an apparent modulus of elasticity not exceeding 3,500 Kg per mm2 at loads smaller than one-tenth of the cord ultimate stress.
Claim 3
Dependent Claim
35 words
A tread ring as in claim 1, characterized in that the cords of the additional layers are inclined, with respect to the mid-circumferential plane of the tire, at an angle ranging between 10* and 30*.
Claim 4
Dependent Claim
40 words
A tread ring as in claim 1, characterized in that the additional layer external to the armor has a width not greater than the width of said armor itself, but not less than 40 percent the width of the armor.
Claim 5
Dependent Claim
29 words
A tread ring as in claim 3, characterized in that the additional layer external to the armor is constituted by metal cords whose elements have the same twisting direction.
Claim 6
Dependent Claim
47 words
A tread ring as in claim 1, characterized in that the angle of inclination of the cords of the additional layer external to the armor is of the same sign as the angle of inclination of the cords of the inner additional layer closer to the armor.
Claim 7
Dependent Claim
135 words
A separable tread ring for pneumatic tires embodying an armor longitudinally resistant to tension, at least two layers of metal cords disposed parallel to each other in each layer and crossed in opposite directions relative to the mid-circumferential plane of the tire at angles ranging between 10* and 65*, said last named layers being positioned radially inwardly of said armor, and an additional layer of metal cords disposed radially outwardly of said armor, the cords of said last recited layer being inclined at an angle ranging between 10* and 65* with respect to said mid-circumferential plane, the last recited cords being extensible relative to the cords of said two layers in that they have an apparent modulus of elasticity not exceeding 3,500 Kg per mm2 at loads smaller than one-tenth of the cord ultimate stress.
Claim 8
Dependent Claim
135 words
A separable tread ring for pneumatic tires embodying an armor longitudinally resistant to tension, at least two layers of metal cords disposed parallel to each other in each layer and crossed in opposite directions relative to the mid-circumferential plane of the tire at angles ranging between 10* and 65*, said last named layers being positioned radially inwardly of said armor, and an additional layer of metal cords disposed radially outwardly of said armor, the cords of said last recited layer being inclined at an angle ranging between 10* and 65* with respect to said mid-circumferential plane, the last recited cords being extensible relative to the cords of said two layers in that they have an apparent modulus of elasticity not exceeding 3,500 Kg per mm2 at loads smaller than one-tenth of the cord ultimate stress.
Claim 9
Dependent Claim
29 words
The tread ring defined by claim 6, said armor being formed by metal cords, the coils of which are disposed generally parallel to the mid-circumferential plane of the tire.
Claim 10
Dependent Claim
46 words
The tread ring of claim 1, said third layer cords having a considerably greater extensibility than the other mentioned cords by virtue of their being formed of wires wound in the same direction and without the presence of a central core element within the wound wires.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |