US4282627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large clearance fairlead grommet
Assignee: McDonnell Douglas Corp
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Filing: 1978-12-18
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Granted: 1981-08-11
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Expires: 1998-12-18
Abstract
Abstract A one piece fairlead grommet for protecting an aircraft control cable where penetrating a bulkhead or cable support panel. The fairlead grommet has a generally cylindrical body with frustro conically shaped flanges and a through-slot, generally, longitudinally oriented. The slot forms an angle with a radius line drawn from the center of the grommet bore to permit the slot surfaces to be readily offset and the grommet collapsed around the control cable for installation with the control cable in place. The slot is further biased on a diagonal with respect to the horizontal axis of the grommet bore to ensure a wearing surface in contact with the cable at the slot.
Inventors
- 👤 James W. Downing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:44
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/08; H02G3/081; H02G3/083; F; F16; F16L; F16L5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
202 words
A fairlead grommet for an aircraft control cable comprising: a generally cylindrical body with frustro conically shaped flanges disposed longitudinally at the distal ends of said cylindrical body, oriented with the smaller diameter at the distal end and said cylindrical body having a longitudinal through-bore, centrally disposed with respect to the cylindrical body; a through-slot generally longitudinally formed through said cylindrical body and extending the length thereof between said distal ends from the outer diameter of said flanges into communication with said bore, said through-slot, when viewed in a plane perpendicular to the horizontal axis of said bore, forms an angle with a radius line drawn from the center of said through-bore and said slot is further oriented to form an angle with the horizontal axis of said through-bore when viewed in a plane parallel to the horizontal axis of said bore; and said grommet being made from a comparatively stiff, shape retaining material, with sufficient spring and a low coefficient of friction in sliding against itself to permit said cylindrical body to spiral with the application of axial pressure on the frusto-conical surface of said flanges of said grommet and springs back to said cylindrical shape when the pressure is released.
Claim 2
Dependent Claim
202 words
A fairlead grommet for an aircraft control cable comprising: a generally cylindrical body with frustro conically shaped flanges disposed longitudinally at the distal ends of said cylindrical body, oriented with the smaller diameter at the distal end and said cylindrical body having a longitudinal through-bore, centrally disposed with respect to the cylindrical body; a through-slot generally longitudinally formed through said cylindrical body and extending the length thereof between said distal ends from the outer diameter of said flanges into communication with said bore, said through-slot, when viewed in a plane perpendicular to the horizontal axis of said bore, forms an angle with a radius line drawn from the center of said through-bore and said slot is further oriented to form an angle with the horizontal axis of said through-bore when viewed in a plane parallel to the horizontal axis of said bore; and said grommet being made from a comparatively stiff, shape retaining material, with sufficient spring and a low coefficient of friction in sliding against itself to permit said cylindrical body to spiral with the application of axial pressure on the frusto-conical surface of said flanges of said grommet and springs back to said cylindrical shape when the pressure is released.
Claim 3
Dependent Claim
48 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein said through-slot when viewed in a plane perpendicular to the horizontal axis of said bore forms an angle with a radius line drawn from the center of said through-bore measuring between 40 and 50 degrees.
Claim 4
Dependent Claim
48 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein said through-slot, when viewed in a plane parallel to the horizontal axis of said bore, forms an angle of at least 10 degrees with said horizontal axis whereby said control cable bears across said through-slot.
Claim 5
Dependent Claim
48 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein the width of said through-slot is controlled in relationship to the pre-installation diameter of said cylindrical body between said frustro conically shaped flanges so that when said fairlead is installed said through-slot is essentially closed.
Claim 6
Dependent Claim
22 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein said fairlead is made from a teflon filled nylon.
Claim 7
Dependent Claim
85 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein the largest diameter of said frustro conically shaped flange is such that when said through-slot surfaces are radially disposed so as to not oppose each other and said cylindrical body is circumferentially compressed about said control cable while said slot surfaces are so disposed said generally cylindrical body reduces in size to approach the pre-installation diameter of said through-bore, whereby said fairlead may be installed or removed without removing said control cable.
Claim 8
Dependent Claim
22 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein said generally cylindrical body has contoured distal end portions.
Claim 9
Dependent Claim
45 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein said slot surfaces form an angle between 0 and 15 degrees with the apex located at said bore surface when said generally cylindrical body is circumferentially compressed to engage said slot surfaces.
Claim 10
Dependent Claim
41 words
A fairlead grommet for aircraft control cables as recited in claim 1, wherein said through-bore is at least 21/2 times said control cable diameter when said grommet is installed so as to prevent ice buildup between the cable and the grommet.
References Cited (Backward Citations)
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Cited
US2355126A
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US2421456A
Cited
US2518851A
Cited
US2961691A
Cited
US3016562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |