Patent US3772931A successfully refreshed from Google Patents.
US3772931A
Expired / Lapsed
US
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Self centering pulley system for thin film material
Assignee: DYNALOC CORP
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Filing: 1972-04-05
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Granted: 1973-11-20
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Expires: 1992-04-05
Abstract
Abstract For endless belting of thin film material having characteristic fabricational twists causing sidewise creeping and wrinkling of such material relative to a pair of pulleys crowned toward center and each having a surface configuration for 180* wrap around engagement to afford alternately opposite inwardly and outwardly tending crosswise forces to such belting and the tensioning of the latter at one edge by an unparallel adjustment between the pulleys to compensate for the creep creating twist in such belting and for smoothing the latter widthwise transversely of the direction of movement thereof over the pulleys.
Inventors
- 👤 R Conrad
- 👤 J Hohmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:07
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/32; F16H55/36; F16H2055/363
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
In a closed loop system of thin film, flexible, wrinkleable material trained over a set of rollers including a drive roller and idler roller axially adjusted to compensate for dimensional deviations caused by the characteristics of such thin film material, and wherein the material has at least 180* wrap-around engagement with the drive roller and the idler roller, an improved drive roller and idler roller combination comprising: a drive roller having a web engaging surface including a central band disposed intermediate the ends of the roller, oppositely directed spirally tending lands spiralling inwardly from each end of the roller toward the central band, and angularly disposed, depressed faces formed between adjacent lands, said faces declining inwardly toward said central band; and an idler roller having a web engaging surface including a central band disposed intermediate the ends of the roller, oppositely directed, spirally tending lands spiralling outwardly from the central band to the ends of the roller, and angularly disposed depressed faces formed between adjacent lands, said faces declining outwardly toward the ends of the roller.
Claim 2
Dependent Claim
176 words
In a closed loop system of thin film, flexible, wrinkleable material trained over a set of rollers including a drive roller and idler roller axially adjusted to compensate for dimensional deviations caused by the characteristics of such thin film material, and wherein the material has at least 180* wrap-around engagement with the drive roller and the idler roller, an improved drive roller and idler roller combination comprising: a drive roller having a web engaging surface including a central band disposed intermediate the ends of the roller, oppositely directed spirally tending lands spiralling inwardly from each end of the roller toward the central band, and angularly disposed, depressed faces formed between adjacent lands, said faces declining inwardly toward said central band; and an idler roller having a web engaging surface including a central band disposed intermediate the ends of the roller, oppositely directed, spirally tending lands spiralling outwardly from the central band to the ends of the roller, and angularly disposed depressed faces formed between adjacent lands, said faces declining outwardly toward the ends of the roller.
Claim 3
Dependent Claim
34 words
In a closed loop system as recited in claim 1 wherein the web engaging surfaces of said rollers taper from said central bands toward the opposite ends of said rollers to form crowned rollers.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |