US3879153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attachment for rotor hub and pairs of blades
Assignee: Individual
•
Filing: 1974-01-07
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Granted: 1975-04-22
•
Expires: 1994-01-07
Abstract
Abstract This invention relates to an improved attachment for a rotary wing aircraft having opposed pairs of rotor blades about a central rotor hub in which diametrically extending pairs of cables are supported on the hub and have their ends interconnect the rotor blades and act as hinges therefore and balance the radial load on the cables between associated blades. A rigid member, rotatable in a hub fixture, connects the hub to each rotor blade and acts as a pitch change tube and droop stop. A transverse pivot in this member at the blade connector also allows for lead-lag movement.
Inventors
- 👤 Gerald L Breuner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:50
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/33; B64C27/37; B64C27/41; B64C27/43
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
In a rotating wing aircraft having a pair of rotor blades in diametrically opposed relation about a central rotor hub an attachment and control means for said blades and hub comprising, a pair of cable means having each of their opposite ends attached to an associated pair of diametrically opposed rotor blades and extending longitudinally across the rotor hub in overlapping crossing relation, a pair of first fixture means carried at the inner end of each of the rotor blades for rigidly attaching the respective cable ends in spaced relation along the inner ends of the rotor blades, a second fixture means attached to the central rotor hub for supporting and carrying the cables on said rotor hub such that the blades may move relative to the hub while the cables transmit the radial load between the opposed pair of blades, a pair of pitch control members rotatably carried between the rotor hub and the inner end of each rotor blade centrally of the cable ends, means for rotating the pitch control members to selectively change the pitch of each blade.
Claim 2
Dependent Claim
181 words
In a rotating wing aircraft having a pair of rotor blades in diametrically opposed relation about a central rotor hub an attachment and control means for said blades and hub comprising, a pair of cable means having each of their opposite ends attached to an associated pair of diametrically opposed rotor blades and extending longitudinally across the rotor hub in overlapping crossing relation, a pair of first fixture means carried at the inner end of each of the rotor blades for rigidly attaching the respective cable ends in spaced relation along the inner ends of the rotor blades, a second fixture means attached to the central rotor hub for supporting and carrying the cables on said rotor hub such that the blades may move relative to the hub while the cables transmit the radial load between the opposed pair of blades, a pair of pitch control members rotatably carried between the rotor hub and the inner end of each rotor blade centrally of the cable ends, means for rotating the pitch control members to selectively change the pitch of each blade.
Claim 3
Dependent Claim
181 words
In a rotating wing aircraft having a pair of rotor blades in diametrically opposed relation about a central rotor hub an attachment and control means for said blades and hub comprising, a pair of cable means having each of their opposite ends attached to an associated pair of diametrically opposed rotor blades and extending longitudinally across the rotor hub in overlapping crossing relation, a pair of first fixture means carried at the inner end of each of the rotor blades for rigidly attaching the respective cable ends in spaced relation along the inner ends of the rotor blades, a second fixture means attached to the central rotor hub for supporting and carrying the cables on said rotor hub such that the blades may move relative to the hub while the cables transmit the radial load between the opposed pair of blades, a pair of pitch control members rotatably carried between the rotor hub and the inner end of each rotor blade centrally of the cable ends, means for rotating the pitch control members to selectively change the pitch of each blade.
Claim 4
Dependent Claim
181 words
In a rotating wing aircraft having a pair of rotor blades in diametrically opposed relation about a central rotor hub an attachment and control means for said blades and hub comprising, a pair of cable means having each of their opposite ends attached to an associated pair of diametrically opposed rotor blades and extending longitudinally across the rotor hub in overlapping crossing relation, a pair of first fixture means carried at the inner end of each of the rotor blades for rigidly attaching the respective cable ends in spaced relation along the inner ends of the rotor blades, a second fixture means attached to the central rotor hub for supporting and carrying the cables on said rotor hub such that the blades may move relative to the hub while the cables transmit the radial load between the opposed pair of blades, a pair of pitch control members rotatably carried between the rotor hub and the inner end of each rotor blade centrally of the cable ends, means for rotating the pitch control members to selectively change the pitch of each blade.
Claim 5
Dependent Claim
76 words
The blade and hub attachment device for rotary wing aircraft as defined in claim 1 and wherein each of the cables of the pair of cable means are further defined as extending diametrically across the rotor hub and further defined as displaced along the axis of rotation of the hub from one another such that the respective cable ends intersect the respective rotor blades along a line lying along the nominal pitch plane of each blade.
Claim 6
Dependent Claim
94 words
The blade and hub attachment device for rotary wing aircraft as defined in claim 1 and wherein each of said cables of the pair of cable means is formed of spirally twisted multi-stranded cable and is laid in a straight line between the rotor blades such that the strands of one of the cable pair are of an opposite twist to the strands of the other cable, or each cable is non-rotating, and the cables are further covered with a synthetic resin layer between the attached ends thereof to provide a vibration dampening cover.
Claim 7
Dependent Claim
77 words
The device as defined in claim 1 and wherein each of the cable ends of the pair of cable means is securely carried in a swagged fitting having a radius relief chamfer of its inner end to eliminate fatigue in the cables, and wherein said first fixture means has a socket for accepting said swagged fitting to securely attach the cable end to the rotor blade with the socket aligned along a diametric line of the hub.
Claim 8
Dependent Claim
61 words
The device as defined in claim 1 and wherein said second fixture means includes a pair of fixture supports secured at the outer edges of the rotor hub adjacent each rotor blade and each support having spaced throughbores for accepting said pairs of cable means with a ball bushing therebetween for supporting the pitch control member of the associated rotor blade.
Claim 9
Dependent Claim
46 words
The device as defined in claim 1 and wherein, each of the pairs of pitch control members is carried on the inner end of its associated rotor blade through a transverse rotary bearing mount to allow the blade to pivot in the lead and lag directions.
References Cited (Backward Citations)
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Cited
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US3384185A
Cited
US3578877A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |