US3768334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load equalized tension torsion tie bar
Assignee: Bendix Corp
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Filing: 1972-06-26
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Granted: 1973-10-30
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Expires: 1992-06-26
Abstract
Abstract A laminated tie bar or coupling particularly adapted to interconnect a helicopter rotor arm and rotor blade is provided with a pair of spaced apart end bushings interconnected by an endless belt. A pliable material interposed between the belt and each end bushing provides a bearing surface therebetween which deforms under unequal pressure or load distribution as a result of angular movement of an end bushing causing a bending moment on the belt which deformation redistributes and equalizes the pressure or load imposed on the belt.
Inventors
- 👤 R Ditlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:59
CPC Classifications
F; F16; F16C; F16C7/00; F16C7/02; F16C7/026; B; B29; B29C; B29C53/00; B29C53/56; B29C53/564; B29C70/00; B29C70/04; B29C70/28; B29C70/54; B29C70/56; B29C70/68; B29C70/86; B64; B64C; B64C27/00; B64C27/32; B64C27/327; F16C2326/00; F16C2326/43; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A tension torsion tie bar for connecting two members comprising: first and second spaced apart annular bushings each having a sleeve portion adapted to receive one of said two members and provided with axially spaced apart flange portions extending radially outwardly therefrom; a belt wrapped around said first and second bushings and retained thereon by said axially spaced apart flange portions; a pliable material trapped between said belt and said sleeve portion and providing a deformable bearing surface for said belt; said pliable material being pressure responsive and adapted to flow from a high pressure zone to a lower pressure zone intermediate said belt and sleeve portion to thereby equalize the bearing pressure transversely across said belt.
Claim 2
Dependent Claim
117 words
A tension torsion tie bar for connecting two members comprising: first and second spaced apart annular bushings each having a sleeve portion adapted to receive one of said two members and provided with axially spaced apart flange portions extending radially outwardly therefrom; a belt wrapped around said first and second bushings and retained thereon by said axially spaced apart flange portions; a pliable material trapped between said belt and said sleeve portion and providing a deformable bearing surface for said belt; said pliable material being pressure responsive and adapted to flow from a high pressure zone to a lower pressure zone intermediate said belt and sleeve portion to thereby equalize the bearing pressure transversely across said belt.
Claim 3
Dependent Claim
19 words
A tension torsion tie bar as claimed in claim 1, wherein: said axially spaced apart flange portions are semi-circular.
Claim 4
Dependent Claim
63 words
A tension torsion tie bar as claimed in claim 2, wherein: said sleeve portion is provided with a depressed outer peripheral surface portion bounded by said axially spaced apart flange portions; said pliable material being trapped between said depressed surface and said belt and providing a bearing surface having a radius of curvature equal to the non-depressed peripheral portion of said sleeve portion.
Claim 5
Dependent Claim
43 words
A tension torsion tie bar as claimed in claim 3, wherein: said depressed outer peripheral surface portion is defined by a relatively flat section having circumferentially spaced apart axially extending curved edges which merge with the depressed peripheral portion of said sleeve portion.
Claim 6
Dependent Claim
29 words
A tension torsion tie bar as claimed in claim 1, wherein: said belt is formed of a lamination of spaced apart parallel filaments joined together by an elastomeric adhesive.
Claim 7
Dependent Claim
46 words
A tension torsion tie bar as claimed in claim 5, wherein: said pliable material is distributed to maintain the tensile load absorbed by each of said filaments substantially equal under the influence of a bending moment imposed on said belt by tilting movement of said bushings.
Claim 8
Dependent Claim
29 words
A tension torsion tie bar as claimed in claim 1, wherein: said belt bears against said axially spaced apart flange portions thereby preventing extrusion of said pliable material therebetween.
References Cited (Backward Citations)
US3279278A
Cited
US3411379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |