Patent US3606575A successfully refreshed from Google Patents.
US3606575A
Expired / Lapsed
US
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Rigid hubs for variable pitch rotors
Assignee: SOC D CONST ET D EXPLOIT DE MA
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Filing: 1969-02-10
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Granted: 1971-09-20
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Expires: 1989-02-10
Abstract
Abstract THE HUB COMPRISES A ROTARY AXLE, A HUB BODY RIGIDLY SECURED TO THIS AXLE, AND ARMS FIXED TO THE HUB BODY, THE VARIABLE PITCH BLADES ARE FIXED TO THE FREE ENDS OF THE ARMS. EACH ARM COMPRISES AT LEAST THREE BUNDLES OF PILED STRIPS, THESE BUNDLES BEING DISTRIBUTED ABOUT THE PITCH VARIATION AXIS OF THE CORRESPONDING BLADE. THE BUNDLES OF ANY ONE ARM ARE CONNECTED TO EACH OTHER AND TO THE HUB BODY BY HOLDING MEANS-NAMELY RIGID COLLARS AND SHEETS-SUCH THAT THE ARM POSSESES A HIGH RESISTANCE TO FLEXION AND A RELATIVELY LOW RESISTANCE TO TORSION.
Inventors
- 👤 Lucien Edmond Lermusiaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:57
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/02; B64C27/021; B64C27/33
Claims Analysis
Total Claims: 0
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |