US3829116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable guide mechanism
Assignee: ROLAIR SYST Inc
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Filing: 1972-10-24
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Granted: 1974-08-13
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Expires: 1992-10-24
Abstract
Abstract A retractable guide wheel mechanism for an air cushion transporter and suitable for mounting within or at the edge of the transporter platform. A housing with pivoted frame carrying the guide wheel, with a spring for urging the wheel upward and an air unit for urging the wheel downward into engagement with the ground surface.
Inventors
- 👤 R Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:11
CPC Classifications
B; B60; B60V; B60V3/00; B60V3/02; B60V3/025
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
Guide wheel mechanism for an air cushion transporter, comprising in combination: a housing including an upper plate and a lower plate; a wheel; a frame mounted at one end in said housing between said upper and lower plates for pivoting toward and away from said upper plate, with said wheel mounted at the opposite end of said frame for rotation about an axis parallel to the frame pivot axis; spring means carried between said frame and housing for urging said frame upward; an air balloon unit carried between said frame and housing for urging said frame downward when inflated; means for introducing air under pressure into said air balloon unit; with said spring means mounted between said frame and housing lower plate, and with said air balloon unit mounted between said frame and housing upper plate; and a spring tube fixed in said frame and a plug threadedly mounted in said tube, with said spring means including a coil spring in said tube between said plug and lower plate.
Claim 2
Dependent Claim
169 words
Guide wheel mechanism for an air cushion transporter, comprising in combination: a housing including an upper plate and a lower plate; a wheel; a frame mounted at one end in said housing between said upper and lower plates for pivoting toward and away from said upper plate, with said wheel mounted at the opposite end of said frame for rotation about an axis parallel to the frame pivot axis; spring means carried between said frame and housing for urging said frame upward; an air balloon unit carried between said frame and housing for urging said frame downward when inflated; means for introducing air under pressure into said air balloon unit; with said spring means mounted between said frame and housing lower plate, and with said air balloon unit mounted between said frame and housing upper plate; and a spring tube fixed in said frame and a plug threadedly mounted in said tube, with said spring means including a coil spring in said tube between said plug and lower plate.
Claim 3
Dependent Claim
40 words
A mechanism as defined in claim 1 with said wheel and a portion of said frame extending over said lower plate, and with said upper plate extending over said frame and wheel for positioning on transporter platform wheel well brackets.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |