US3603033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flying rotorcraft toy
Assignee: Individual
•
Filing: 1969-10-06
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Granted: 1971-09-07
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Expires: 1989-10-06
Abstract
Abstract A flying toy having a driven propeller mounted in a duct, with lifting rotor blades extending from the top of the duct, the outer ends of the blades being interconnected by a protective annular ring. The duct and blade assembly rotates in the opposite direction to the propeller, due to torque, the lift of the blades adding to that of the propeller for vertical propulsion. When power is shut off, the toy descends gently in autorotation. The airframe structure is a simple unitary molding and the rotor blades are partially adjustable in pitch to vary the effective lift and thus control the flight.
Inventors
- 👤 Leonard E Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:08
CPC Classifications
A; A63; A63H; A63H27/00; A63H27/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A flying rotorcraft, comprising, a substantially cylindrical duct having an outwardly rolled upper rim, a plurality of substantially radial rotor blades extending outwardly and angularly downwardly from said rim, a tip ring interconnecting the outer ends of said blades, said tip ring, blades and rim being in a conical configuration coaxial with said duct, arms extending across the lower end of said duct and having a platform thereon, and an engine secured on said platform, with a driven propeller thereon mounted for axial rotation is said duct.
Claim 2
Dependent Claim
87 words
A flying rotorcraft, comprising, a substantially cylindrical duct having an outwardly rolled upper rim, a plurality of substantially radial rotor blades extending outwardly and angularly downwardly from said rim, a tip ring interconnecting the outer ends of said blades, said tip ring, blades and rim being in a conical configuration coaxial with said duct, arms extending across the lower end of said duct and having a platform thereon, and an engine secured on said platform, with a driven propeller thereon mounted for axial rotation is said duct.
Claim 3
Dependent Claim
26 words
A rotorcraft according to claim 1, wherein each of said rotor blades has a spanwise row of perforations, for providing a bendable leading edge portion thereof.
Claim 4
Dependent Claim
26 words
A rotorcraft according to claim 2, wherein said duct, said arms, said rotor blades and said tip ring are made from a single piece of material.
References Cited (Backward Citations)
FR465032A
Cited
US1190378A
Cited
US1684567A
Cited
US2169325A
Cited
US2980365A
Cited
US2949693A
Cited
FR1347733A
Cited
US3394906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |