Patent US3797964A successfully refreshed from Google Patents.
US3797964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary wing apparatus
Assignee: Individual
•
Filing: 1971-06-24
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Granted: 1974-03-19
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Expires: 1991-06-24
Abstract
Abstract The specification discloses a novel wing, or blade, of the nonarticulated or ''''rigid'''' type for a rotary wing aircraft. Tension, bending, and shear supporting elements such as bands of fibre glass are bonded in a force distributing manner to the body of the lifting blade and carried in a slender bonded fibre glass bundle-filler material assembly flexure arm from the inboard end of the lifting body to a hub attachment fixture. The resultant flexure member is stiff in tension but torsionally relatively very soft. Torsional strength and pitch control to the blade is provided by a pair of torsionally rigid torque tubes in plane with and in a straddled relation with the tension arm flexure member.
Inventors
- 👤 T Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:47
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/33
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
Rotary wing apparatus comprising: lift section means; root end fixture means; tension, compression, bending, and shear supporting cantilever beam flexure arm means having first and second end portions and a torsionally soft mid portion interconnective segment; said cantilever beam flexure arm means comprising at least one torsionally soft, elongated band consisting of a composite of tension supportive fibres integrally bonded with filler material; said first end portion of said flexure arm means being affixed to said lift section means in tension, compression, bending, and shear transmissive relation therewith, and said at least one elongated bonded composite band extending along said mid portion interconnective segment of said flexure arm means, being disposed about said root end fixture means in a snugged wrap-around relation therewith, and thence returning along said mid portion segment all in a manner whereby said second end portion is affixed to said root end fixture means in tension, compression, bending, and shear transmissive relation therewith.
Claim 2
Dependent Claim
157 words
Rotary wing apparatus comprising: lift section means; root end fixture means; tension, compression, bending, and shear supporting cantilever beam flexure arm means having first and second end portions and a torsionally soft mid portion interconnective segment; said cantilever beam flexure arm means comprising at least one torsionally soft, elongated band consisting of a composite of tension supportive fibres integrally bonded with filler material; said first end portion of said flexure arm means being affixed to said lift section means in tension, compression, bending, and shear transmissive relation therewith, and said at least one elongated bonded composite band extending along said mid portion interconnective segment of said flexure arm means, being disposed about said root end fixture means in a snugged wrap-around relation therewith, and thence returning along said mid portion segment all in a manner whereby said second end portion is affixed to said root end fixture means in tension, compression, bending, and shear transmissive relation therewith.
Claim 3
Dependent Claim
54 words
The invention as set forth in claim 1 in which the said fibres of the portions of at least some of said at least one band which are affixed to said lift section are disposed in an array which diverges within said lift section away from said connective segment of said flexure arm means.
Claim 4
Dependent Claim
50 words
The invention as set forth in claim 1 which further includes elastomeric, stress distributive transition means interposed and bonded between at least a portion of said at least one band and said root end fixture means for creating a continuous distribution of stress transmission between said fixture and said bands.
Claim 5
Dependent Claim
53 words
The invention as set forth in claim 1 which further includes at least one torsion stress transmissive number affixed to said lift section means in torque transmissive relation therewith and disposed contiguously along said flexure arm means for transmitting in a bypassing relation therewith, pitch signals to and from said lift section means.
Claim 6
Dependent Claim
20 words
The invention as set forth in claim 4 in which the number of torsion transmissive members is at least two.
Claim 7
Dependent Claim
108 words
The invention as set forth in claim 5 which further includes first and second end plate elements affixed to said torsion members, said first plate element being disposed contiguously to said lift section means and being affixed to the ends toward said lift section means of each of said torsion members in a torsion signal transmissive relation therewith, and said second end plate element being affixed to the opposite ends of each of said torsion members again in a torsion transmissive relation therewith whereby said first and second end plate elements are, through said torsion members, mutually intercoupled for the conduction of lift section pitch signals bilaterally therebetween.
Claim 8
Dependent Claim
81 words
The invention as set forth in claiM 1 in which said mid portion interconnective segment of said flexure arm means is disposed substantially along a predetermined axis of pitch displacement and said lift section means defines a chord axis substantially coplanar with said pitch axis, and in which said chord axis is displaced angularly forwardly, with respect to the direction of forward rotation of said rotary wing apparatus, of said pitch axis to define a forward sweep angle of predetermined magnitude.
Claim 9
Dependent Claim
48 words
The invention as set forth in claim 5 which further includes in-plane displacement damping means carried by said torsion members and coupled to said interconnective segment of said flexure arm for absorbing the energy of in-plane displacement of said flexure arm means with respect to said torsion members.
Claim 10
Dependent Claim
67 words
The invention as set forth in claim 1 in which said filler material is elastomeric and is disposed between and coupled continouously to said bands along at least a portion of said interconnective segment of said flexure arm means, said elastomeric filler material being of the character exhibiting relatively high hysteresis losses with respect to in-plane deflection of said flexure arm means for absorbing energy associated therewith.
Claim 11
Dependent Claim
28 words
The invention as set forth in claim 1 in which said flexure arm means comprises at least one pair of said filler composite bands of tension supportive fibres.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |