US3738772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillating plate for helicopters
Assignee: SIAI MARCHETTI SpA
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Filing: 1972-03-07
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Granted: 1973-06-12
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Expires: 1992-03-07
Abstract
Abstract A dynamic oscillating plate is disclosed for use on a helicopter. The plate includes the combination of an upper forged ring having an over-turned U hollow section, and a lower forged ring having a U hollow section which is dimensioned to mate internally with the overturned U hollow section. The mating members form a rigid connection highly resistant to deflection and torsional forces when secured in mating position solely by engaging contact of mating arms of the U hollow sections, and without added mechanical engaging means.
Inventors
- 👤 G Parenti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:38
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/605
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A dynamic oscillating plate for a helicopter which comprises in combination, an upper forged ring having an overturned Uhollow section, flange members projecting outwardly from the hollow sections and forming coupling points for pitch control columns, and means projecting inwardly for engaging through bearing members with an oscillation spherical surface disposed to a fixed sleeve relative to a vertical axis of a rotor; and a lower forged ring having a U-hollow section and dimensioned to mate internally with said overturned U-hollow section, said mating forming a rigid connection highly resistant to deflection and torsional forces and secured in mating position solely by engaging contact of mating arms of the U-hollow sections, and without added mechanical engaging means.
Claim 2
Dependent Claim
117 words
A dynamic oscillating plate for a helicopter which comprises in combination, an upper forged ring having an overturned Uhollow section, flange members projecting outwardly from the hollow sections and forming coupling points for pitch control columns, and means projecting inwardly for engaging through bearing members with an oscillation spherical surface disposed to a fixed sleeve relative to a vertical axis of a rotor; and a lower forged ring having a U-hollow section and dimensioned to mate internally with said overturned U-hollow section, said mating forming a rigid connection highly resistant to deflection and torsional forces and secured in mating position solely by engaging contact of mating arms of the U-hollow sections, and without added mechanical engaging means.
Claim 3
Dependent Claim
17 words
The dynamic oscillating plate of claim 1 wherein chemical bonding means is included between the mating surfaces.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |