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US3951192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tire
Assignee: Bridgestone Firestone Inc
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Filing: 1975-01-30
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Granted: 1976-04-20
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Expires: 1995-01-30
Abstract
Abstract This disclosure relates to a pneumatic tire construction which has a bead latch located axially outwardly of the rim flange in the lower sidewall area of the tire. This construction provides a safer configuration for the tire when it is run flat or under abnormal conditions. The bead latch prevents the bead from becoming unseated on the rim and moving into the drop center portion of the rim.
Inventors
- 👤 James Dennis Gardner
- 👤 James Philip Lawrence
- 👤 Stephen Thomas Griebling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:56
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; B60C15/02; B60C15/0209; B60C15/023; B60C17/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10828
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
In combination, a pneumatic tire and a rim wherein said tire is designed to be mounted on said rim, said tire having a bead latch located in the lower sidewall area of each of its sidewalls, said rim having a drop center portion and two flange portions designed to receive the beads of said tire, said bead latch having a portion which extends axially outwardly and radially inwardly of said rim flange when said tire is mounted on said rim, said bead latch comprising a recessed portion adapted to fit said rim flange having a horizontal wall and a vertical wall, said rim flange contacting said horizontal wall along the entire outer periphery of said rim flange and not contacting said vertical wall when said tire is subjected to normal inflation pressure and load, said rim flange partially contacting said horizontal wall along said rim flange's outer periphery and not contacting said vertical wall when said tire is subjected to normal inflation pressure and not under load, said combination having the diameter of said bead latch less than the outer diameter of said rim flange so that said bead latch engulfs said rim flange when the tire is run uninflated and under load thereby preventing the tire bead from becoming unseated during said run-flat operation.
Claim 2
Dependent Claim
215 words
In combination, a pneumatic tire and a rim wherein said tire is designed to be mounted on said rim, said tire having a bead latch located in the lower sidewall area of each of its sidewalls, said rim having a drop center portion and two flange portions designed to receive the beads of said tire, said bead latch having a portion which extends axially outwardly and radially inwardly of said rim flange when said tire is mounted on said rim, said bead latch comprising a recessed portion adapted to fit said rim flange having a horizontal wall and a vertical wall, said rim flange contacting said horizontal wall along the entire outer periphery of said rim flange and not contacting said vertical wall when said tire is subjected to normal inflation pressure and load, said rim flange partially contacting said horizontal wall along said rim flange's outer periphery and not contacting said vertical wall when said tire is subjected to normal inflation pressure and not under load, said combination having the diameter of said bead latch less than the outer diameter of said rim flange so that said bead latch engulfs said rim flange when the tire is run uninflated and under load thereby preventing the tire bead from becoming unseated during said run-flat operation.
Claim 3
Dependent Claim
31 words
The combination of claim 1 wherein a substantial portion of said bead latch which engulfs the rim flange contains the rubber compound which is used for the sidewall of said tire.
Claim 4
Dependent Claim
25 words
The combination of claim 1 wherein a substantial portion of said bead latch which engulfs the rim flange contains a hard, high modulus rubber compound.
Claim 5
Dependent Claim
66 words
The combination of claim 1 wherein said bead latch has a chafer strip which is resistant to the abrasion caused by the rim when the tire is running under normal conditions or running flat, said chafer strip located on and covering the entire periphery of said bead latch from a point substantially radially above said rim flange to a point in contact with said rim flange.
Claim 6
Dependent Claim
13 words
The combination of claim 1 wherein said bead latch contains reinforcing cord material.
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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |