Patent US3921689A successfully refreshed from Google Patents.
US3921689A
Expired / Lapsed
US
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Safety tire with a sealing action and an anti-burst action
Assignee: Industrie Pirelli SpA
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Filing: 1973-07-25
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Granted: 1975-11-25
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Expires: 1993-07-25
Abstract
Abstract A pneumatic tire with both a sealing action and an anti-burst action is disclosed. The tire has an inflatable structure made of an elastic foam material having prevailingly closed cells in the form of an annular band below the tread band of the casing with a width at least equal to the width of the tread band and means preventing the flow of tire air out of the area between the outer surface of the annular band and the casing inner surface corresponding thereto. The tire can be radial if desired.
Inventors
- 👤 Angelo Caccia
- 👤 Vincenzo Benatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
B; B60; B60C; B60C19/00; B60C19/12; B60C19/122; B60C19/002; B60C5/00; B60C5/12; B60C5/14; B60C9/00; B60C9/02; B60C9/14; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10279; Y10T152/10378; Y10T152/10387; Y10T152/10396; Y10T152/10495; Y10T152/10666
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
215 words
A pneumatic tire having a casing with a tread band, comprising: an annular band of elastic foam material with prevailingly closed cells, capable of leaning on the internal surface of said casing situated below said tread band, the width of the annular band being at least equal to the width of the tread band of said tire, the thickness of the annular band being no greater than 20 mm and the moment of polar inertia of the annular band measured with respect to the axis of rotation being no greater than one fifth of the moment of inertia of the tire devoid of said band; a pair of deformable sidewalls for said annular band, each of which is intended to lean substantially on a corresponding sidewall of said casing and has an outer circular edge secured to a corresponding lateral edge of said annular band, and extending upon the side wall of the casing up to a corresponding bead of the tire, so that said annular band and said pair of deformable sidewalls define an inflatable structure; means capable of preventing the flow of tire inflation air from said inflatable structure in the space between the outer surface of the latter and the corresponding inner surface of the casing below which said structure is situated.
Claim 2
Dependent Claim
215 words
A pneumatic tire having a casing with a tread band, comprising: an annular band of elastic foam material with prevailingly closed cells, capable of leaning on the internal surface of said casing situated below said tread band, the width of the annular band being at least equal to the width of the tread band of said tire, the thickness of the annular band being no greater than 20 mm and the moment of polar inertia of the annular band measured with respect to the axis of rotation being no greater than one fifth of the moment of inertia of the tire devoid of said band; a pair of deformable sidewalls for said annular band, each of which is intended to lean substantially on a corresponding sidewall of said casing and has an outer circular edge secured to a corresponding lateral edge of said annular band, and extending upon the side wall of the casing up to a corresponding bead of the tire, so that said annular band and said pair of deformable sidewalls define an inflatable structure; means capable of preventing the flow of tire inflation air from said inflatable structure in the space between the outer surface of the latter and the corresponding inner surface of the casing below which said structure is situated.
Claim 3
Dependent Claim
18 words
The pneumatic tire of claim 1 wherein said material forming said annular band is a vulcanized rubber foam.
Claim 4
Dependent Claim
18 words
The pneumatic tire of claim 1 wherein said material forming said annular band is a plastic material foam.
Claim 5
Dependent Claim
55 words
The pneumatic tire of claim 1 wherein said annular band is built up by a forming operation to produce a pre-established pressure inside the cells of the material of which it is constituted such that the pressure at the end of the forming operation will be substantially equal to the inflation pressure of the tire.
Claim 6
Dependent Claim
66 words
The pneumatic tire of claim 1 wherein said means capable of preventing the flow of tire inflation air comprises an annular deformable element intended to lean substantially on the sidewalls of said tire and on the rim and provided with two circular edges, each of which is connected to a corresponding lateral edge of said annular band to form a tight annular envelope with said band.
Claim 7
Dependent Claim
28 words
The pneumatic tire of claim 1 wherein stiffening cords are disposed in one or more layers inside said annular band and in the proximity of its inner surface.
Claim 8
Dependent Claim
38 words
The pneumatic tire of claim 1 wherein said means capable of preventing the flow of tire inflation air comprises an inner circular edge on each of said deformable sidewalls tightly connected with a corresponding bead of said tire.
Claim 9
Dependent Claim
28 words
The pneumatic tire of claim 7 wherein said inner circular edge of each of said deformable sidewalls is connected by bonding to the relative bead of said tire.
Claim 10
Dependent Claim
34 words
The pneumatic tire of claim 7 wherein said deformable sidewalls for said annular band are made of elastic foam material to form an individual element with said band comprising a central band and sidewalls.
Claim 11
Dependent Claim
56 words
The pneumatic tire of claim 9 wherein the inner circular edge of each sidewall of said element comprising a central band and sidewalls is secured to a corresponding edge of an annular deformable element intended to lean on the rim and to form a tight annular envelope with said element comprising a central band and sidewalls.
Claim 12
Dependent Claim
49 words
The pneumatic tire of claim 9 wherein said inflatable structure comprises a small carcass provided with one or more cord plies, arranged inside said element comprising a central band and sidewalls, and intended to be in contact both with tHe central band and the sidewalls of the element itself.
Claim 13
Dependent Claim
23 words
The pneumatic tire of claim 11 wherein said small carcass leans both on the central band and on the sidewalls of said element.
Claim 14
Dependent Claim
25 words
The pneumatic tire of claim 11 wherein said small carcass is bonded to the inner surface of said element comprising a central band and sidewalls.
Claim 15
Dependent Claim
48 words
The pneumatic tire of claim 11 wherein said small carcass is provided with bead capable of exerting pressures on the inner edge of each sidewall of said element comprising a central band and sidewalls to ensure a seal between said edge and the corresponding bead of said tire.
Claim 16
Dependent Claim
43 words
The pneumatic tire of claim 14 wherein each inner circular edge of said small carcass is secured to a corresponding edge of an annular deformable element intended to lean on the rim and to form a tight annular envelope with said small carcass.
Claim 17
Dependent Claim
88 words
The pneumatic tire of claim 11 wherein said casing comprises one or more cord plies, characterized in that the cords of the plies of said small carcass form an angle considerably different from 0* with the cords of the plies of said casing such that the direction of maximum resistance to flexion of said cord plies of said small carcass forms an angle considerably different from 0* with the direction in which a tear in said casing is more likely to occur in case of a tire burst.
Claim 18
Dependent Claim
73 words
The pneumatic tire of claim 16 wherein said casing comprises several superimposed plies of cord fabric arranged in such a way that the cords of each ply have a different inclination with respect to the cords of another ply, characterized in that the cords of said plies of the small carcass have a substantially radial arrangement forming an angle ranging from 88* to 90* with respect to the parallels of the small carcass.
Claim 19
Dependent Claim
48 words
The pneumatic tire of claim 16 wherein the casing is of the radial type, characterized in that the cords of said plies of said small carcass have a substantially sub-radial arrangement forming an angle ranging from 75* to 80* with respect to the parallels of the small carcass.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |