Patent US3701474A successfully refreshed from Google Patents.
US3701474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency trackage for vehicle wheels
Assignee: Individual
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Filing: 1970-07-16
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Granted: 1972-10-31
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Expires: 1990-07-16
Abstract
Abstract A pair of rectangular dished plates are ring-hinged together at their adjacent edges and each provided with spaced upper cross battens, the second plate also having cross battens thereunder and being similarly hinged to a ground tread having spaced upper and lower cross bars; the first plate is placed in the ground and against the tire of a mired automobile wheel, and when the wheel is driven, it grips the battens to drag the plates thereunder until the plates and ground tread anchor at the ground opening formed by the rotating wheel, and so permit the wheel to ride in and up the track so formed.
Inventors
- 👤 Rudolf Welz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:19
CPC Classifications
B; B60; B60B; B60B39/00; B60B39/02; B60B39/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
258 words
Emergency trackage for vehicle wheels, comprising an articulated set of at least three track members including a leading member, an intermediate member and a trailing member arranged in that order in relation to the direction in which the trackage is applied to a wheel, said leading member having a smooth lower surface devoid of projections and being provided on its upper surface with a set of wheel tire gripping elements, said intermediate member having its leading edge connected to the trailing edge of the leading member and said trailing member having its leading edge connected to the trailing edge of the intermediate member, said intermediate member also being provided on its upper surface with a set of wheel tire gripping elements and all but the trailing edge portion of the lower surface of the intermediate member being smooth and devoid of projections, a set of ground gripping elements provided on said trailing edge portion of the lower surface of the intermediate member, a set of wheel tire gripping elements provided on the upper surface of said trailing member, and a set of ground gripping elements provided on the lower surface of the trailing member, the arrangement being characterized in that when the trackage is applied to a rotating wheel, the smooth lower surfaces of the leading and intermediate members permit these members to be drawn under the wheel until the ground gripping elements on the trailing portion of the intermediate member grip the ground to arrest further movement of the trackage and facilitate travel of the wheel therealong.
Claim 2
Dependent Claim
258 words
Emergency trackage for vehicle wheels, comprising an articulated set of at least three track members including a leading member, an intermediate member and a trailing member arranged in that order in relation to the direction in which the trackage is applied to a wheel, said leading member having a smooth lower surface devoid of projections and being provided on its upper surface with a set of wheel tire gripping elements, said intermediate member having its leading edge connected to the trailing edge of the leading member and said trailing member having its leading edge connected to the trailing edge of the intermediate member, said intermediate member also being provided on its upper surface with a set of wheel tire gripping elements and all but the trailing edge portion of the lower surface of the intermediate member being smooth and devoid of projections, a set of ground gripping elements provided on said trailing edge portion of the lower surface of the intermediate member, a set of wheel tire gripping elements provided on the upper surface of said trailing member, and a set of ground gripping elements provided on the lower surface of the trailing member, the arrangement being characterized in that when the trackage is applied to a rotating wheel, the smooth lower surfaces of the leading and intermediate members permit these members to be drawn under the wheel until the ground gripping elements on the trailing portion of the intermediate member grip the ground to arrest further movement of the trackage and facilitate travel of the wheel therealong.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |