US3885614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety tire
Assignee: Bridgestone Corp
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Filing: 1973-10-19
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Granted: 1975-05-27
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Expires: 1993-10-19
Abstract
Abstract A safety tire having an inner tire defining a first tire chamber therein and a tubeless outer tire defining a second tire chamber between the inner and outer tires, which second chamber is isolated from the first chamber. A breaker consisting of rubberized cord plies is disposed on crown portion of the inner tire, so as to produce a sufficient cornering power for running at 100 Km/hour or faster even after breakdown of said outer tire.
Inventors
- 👤 Akira Fujikawa
- 👤 Takashi Takusagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
B; B60; B60C; B60C5/00; B60C5/02; B60C5/04; B60C5/08; B60C17/00; B60C17/01; B60C17/10; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10522; Y10T152/10576; Y10T152/10594; Y10T152/10765
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
243 words
A pneumatic safety tire comprising an outer tubeless tire having a tread and a pair of sidewalls extending from opposing edges of the tread to corresponding tire beads; an inner tire disposed within the outer tire and having a tire tube disposed therein, said inner and outer tires defining first and second tire chambers isolated from each other, respectively, said inner tire having a pair of annular beads, a carcass including at least one reinforcing cord layer and extending across the pair of beads while turning around the opposing edges of the carcass about the beads so as to secure the carcass to the beads, a breaker disposed on the outer surface of the carcass at a crown portion thereof, and a layer of tread rubber overlying the breaker, said breaker including at least two reinforcing plies made of cords each having a Young''s modulus of not smaller than 1.0 X 105 Kg/cm2, said cords of the breaker reinforcing plies being disposed at an angle of 10* to 30* relative to the equatorial direction of the inner tire, said breaker of the inner tire being of cylindrical shape about the axis of rotation of the safety tire, the width of said breaker in parallel to the axis of rotation of the tire being substantially as wide as the tread of said outer tire; and a tire valve means selectively communicating said first and second tire chambers to the outside of the safety tire.
Claim 2
Dependent Claim
243 words
A pneumatic safety tire comprising an outer tubeless tire having a tread and a pair of sidewalls extending from opposing edges of the tread to corresponding tire beads; an inner tire disposed within the outer tire and having a tire tube disposed therein, said inner and outer tires defining first and second tire chambers isolated from each other, respectively, said inner tire having a pair of annular beads, a carcass including at least one reinforcing cord layer and extending across the pair of beads while turning around the opposing edges of the carcass about the beads so as to secure the carcass to the beads, a breaker disposed on the outer surface of the carcass at a crown portion thereof, and a layer of tread rubber overlying the breaker, said breaker including at least two reinforcing plies made of cords each having a Young''s modulus of not smaller than 1.0 X 105 Kg/cm2, said cords of the breaker reinforcing plies being disposed at an angle of 10* to 30* relative to the equatorial direction of the inner tire, said breaker of the inner tire being of cylindrical shape about the axis of rotation of the safety tire, the width of said breaker in parallel to the axis of rotation of the tire being substantially as wide as the tread of said outer tire; and a tire valve means selectively communicating said first and second tire chambers to the outside of the safety tire.
Claim 3
Dependent Claim
30 words
A safety tire according to claim 1, wherein said tread rubber of said inner tire consists of a rubber having a Shore A hardness of not smaller than 40* .
Claim 4
Dependent Claim
35 words
A safety tire according to claim 1, wherein cross sectional height H and width S of the outer tire satisfy the following relation with cross sectional height h and width s of the inner tire,
Claim 5
Dependent Claim
40 words
A safety tire according to claim 1, wherein said inner tire and said tire tube of said inner tire have grooves formed on outer peripheral surface thereof so as to extend from said tire valve to said second tire chamber.
Claim 6
Dependent Claim
73 words
A safety tire according to claim 1, wherein said carcass of said inner tire includes two rubberized plies of nylon cords, which nylon cords are disposed at about 90* relative to the tire equatorial direction, and said breaker of said inner tire includes two rubberized nylon cord plies and one steel cord ply, cords of the three breaker plies of the inner tire being disposed at 20* relative to the tire equatorial direction.
Claim 7
Dependent Claim
48 words
A safety tire according to claim 1, wherein said cords of the reinforcing plies of the inner tire breaker are disposed at 20* relative to the tire equatorial direction, while slanting cords of different inner tire breaker plies to different sides of equator of the inner tire breaker.
Claim 8
Dependent Claim
48 words
A safety tire according to claim 1, wherein said outer tubeless tire has an inner rubber lining disposed on the inner surface thereof, and said tread rubber of said inner tire has a hardness which is the same as that of said rubber lining of said outer tire.
Claim 9
Dependent Claim
55 words
A safety tire according to claim 1, wherein said inner tire has outer surface thereof kept in contact with inner surface of said outer tire at about one third of inner tire section height, taken from the beads of the inner tire in radial directions emanating from the axis of rotation of the safety tire.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |