US4046182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety tire and wheel assemblies
Assignee: Dunlop Ltd
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Filing: 1975-07-29
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Granted: 1977-09-06
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Expires: 1995-07-29
Abstract
Abstract A safety tire and wheel rim assembly incorporating a safety tire support member which is capable of slippage relative to the rim. The wheel rim is of substantially uniform diameter between its bead seats and a pair of spacer members are provided, one on each side of the safety support to give axial location and a bead restraint. Each spacer member has a low friction interface with the support member and a high friction interface with the tire bead.
Inventors
- 👤 Frank Farnsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:13
CPC Classifications
B; B60; B60C; B60C17/00; B60C17/04; B60B; B60B21/00; B60B21/12; B60C17/041; B60C17/045; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10738
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
188 words
A safety tire and wheel rim assembly comprising a pneumatic tire, a wheel rim having a pair of bead retaining flanges bead seats, and between the bead seats a substantially uniform diameter, a safety insert for carrying load between the wheel rim and the tire when the tire becomes deflated, the insert being mounted for circumferential slippage relative to the wheel rim when the assembly is used with the tire in a deflated condition and having a pair of spacers extending circumferentially around the rim on either side of said insert, with one surface of each spacer engaging the axially inner surface of the respective beads of the tire and the other surface of each spacer engaging the sides of said safety insert to provide axial location of said insert, the surface of each spacer engaging a bead having a high coefficient of friction with rubber and the surface of the spacer engaging the insert having a low coefficient of friction with the material of the insert with which it is in contact, to permit circumferential slippage of the insert on the rim relative to the tire beads.
Claim 2
Dependent Claim
188 words
A safety tire and wheel rim assembly comprising a pneumatic tire, a wheel rim having a pair of bead retaining flanges bead seats, and between the bead seats a substantially uniform diameter, a safety insert for carrying load between the wheel rim and the tire when the tire becomes deflated, the insert being mounted for circumferential slippage relative to the wheel rim when the assembly is used with the tire in a deflated condition and having a pair of spacers extending circumferentially around the rim on either side of said insert, with one surface of each spacer engaging the axially inner surface of the respective beads of the tire and the other surface of each spacer engaging the sides of said safety insert to provide axial location of said insert, the surface of each spacer engaging a bead having a high coefficient of friction with rubber and the surface of the spacer engaging the insert having a low coefficient of friction with the material of the insert with which it is in contact, to permit circumferential slippage of the insert on the rim relative to the tire beads.
Claim 3
Dependent Claim
23 words
An assembly according to claim 1 in which each spacer is a continuous ring having substantially uniform axial thickness around its whole circumference.
Claim 4
Dependent Claim
29 words
An assembly according to claim 1 in which the spacers each comprise a band of rigid material having a plurality of blocks mounted thereon at intervals around its circumference.
Claim 5
Dependent Claim
24 words
An assembly according to claim 1 in which the spacers each comprise two or more separate annular component parts which are not fastened together.
Claim 6
Dependent Claim
41 words
An assembly according to claim 1 in which the surface of each spacer contacting the insert is of a rigid material having a coefficient of friction not more than 0.3 μ with the surface of the safety insert which it engages.
Claim 7
Dependent Claim
27 words
An assembly according to claim 1 in which the surface of the spacer contacting the insert is provided with a surface coating of a low friction material.
Claim 8
Dependent Claim
23 words
An assembly according to claim 1 in which the surface of the spacer which contacts the tire bead is a vulcanized rubber material.
Claim 9
Dependent Claim
31 words
An assembly according to claim 1 in which the safety insert comprises a plurality of arcuate members each having coupling portions at each end and coupled together to form a ring.
Claim 10
Dependent Claim
78 words
An annular spacer for use in locating a circumferentially extending safety insert in a safety tire and wheel rim assembly, said spacer including two substantially radially extending surfaces, one surface being of low friction material to permit movement of the safety insert relative to that surface, the other surface being of a material having a high coefficient of friction with rubber to enable said other surface to engage and move with an interior surface of a tire bead.
Claim 11
Dependent Claim
78 words
An annular spacer for use in locating a circumferentially extending safety insert in a safety tire and wheel rim assembly, said spacer including two substantially radially extending surfaces, one surface being of low friction material to permit movement of the safety insert relative to that surface, the other surface being of a material having a high coefficient of friction with rubber to enable said other surface to engage and move with an interior surface of a tire bead.
Claim 12
Dependent Claim
19 words
A spacer according to claim 9 comprising a continuous ring having substantially uniform axial thickness around its whole circumference.
Claim 13
Dependent Claim
24 words
A spacer according to claim 9 comprising a band of rigid material having a plurality of blocks mounted thereon at intervals around its circumference.
Claim 14
Dependent Claim
26 words
A spacer according to claim 9 in which the surface of the spacer, having said low friction material, comprises a surface coating of low friction material.
Claim 15
Dependent Claim
23 words
A spacer according to claim 9 in which the surface of the spacer which contacts the tire bead is a vulcanized rubber material.
Claim 16
Dependent Claim
25 words
A spacer according to claim 9 which comprises a compressible elastic material forming at least 75 percent of its axial thickness in the uncompressed condition.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |