US3695780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel-type airscrew having pre-tensioned blade supports
Assignee: Individual
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Filing: 1970-10-19
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Granted: 1972-10-03
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Expires: 1990-10-19
Abstract
Abstract A wheel-shaped rotor for a helicopter or similar aircraft characterized by an inner hub, a plurality of airfoil blades extending outwardly from the hub portion, an outer rim or ring connected with and joining the outer end portions of the blades, and wherein the blades are supported by pre-tensioned spoke members extending between the hub and outer rim members of the rotor.
Inventors
- 👤 Henry R Velkoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:05
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/001
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A rotary airscrew comprising a central hub; an annular rim positioned in outwardly spaced, encircling relation to said hub; a plurality of spoke members extending between and connected with said hub and said rim; means connected with said spoke members and applying tension thereto when said airscrew is at rest and in motion; and an airfoil blade carried for relative movement on each of said spoke members and free from tension forces applied to said spoke members by said means.
Claim 2
Dependent Claim
80 words
A rotary airscrew comprising a central hub; an annular rim positioned in outwardly spaced, encircling relation to said hub; a plurality of spoke members extending between and connected with said hub and said rim; means connected with said spoke members and applying tension thereto when said airscrew is at rest and in motion; and an airfoil blade carried for relative movement on each of said spoke members and free from tension forces applied to said spoke members by said means.
Claim 3
Dependent Claim
20 words
An airscrew as defined in claim 1, wherein said means is adjustable to vary the tension in said spoke members.
Claim 4
Dependent Claim
30 words
An airscrew as defined in claim 1, wherein said spoke members extend radially between said hub and rim and occupy substantially a common plane when said airscrew is at rest.
Claim 5
Dependent Claim
21 words
An airscrew as defined in claim 1, wherein said spoke members are arranged in non-radial disposition between said hub and rim.
Claim 6
Dependent Claim
24 words
An airscrew as defined in claim 1, wherein the axes of said spoke members are disposed in varying angular relation to adjacent spoke members.
Claim 7
Dependent Claim
23 words
An airscrew as defined in claim 1, wherein said spoke members are connected for limited pivoting movement relative to said hub and rim.
Claim 8
Dependent Claim
25 words
An airscrew as defined in claim 1, wherein said airfoil blades are at least in part rotatively carried on said spoke members for pitch adjustment.
Claim 9
Dependent Claim
31 words
An airscrew as defined in claim 1, wherein each of said airfoil blades includes an outer end portion fixedly secured to said rim but is torsionally adjustable to effect pitch change.
Claim 10
Dependent Claim
33 words
An airscrew as defined in claim 1, wherein adjacent spoke members are connected to said hub in vertically offset relation to one another and lie in angularly related planes convergent at said rim.
Claim 11
Dependent Claim
22 words
An airscrew as defined in claim 1, including means connected with said airfoil blade to effect a pitch change of said blade.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |