US4243192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball pivot thrust bearing flex joint
Assignee: McDonnell Douglas Corp
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Filing: 1978-12-04
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Granted: 1981-01-06
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Expires: 1998-12-04
Abstract
Abstract A ball pivot thrust bearing flex joint assembly having an inner race member and an outer race member, the inner surface of the outer race member being a concave spherical self lubricating surface which provides a maximum envelopment of the complementary convex spherical outer surface of the inner pivoting ball race. The inner race ball is provided with a through aperture along the axis of primary motion for acceptance of a through shaft or bolt, and is provided with integral lateral extensions which are necked down to provide clearance for secondary axis motion. The end portions of the through hole aperture are provided with self lubricating bearings which support the radial loads and accommodate main axis rotation. Flat, washer type, self lubricating bearings are provided between the ends of the inner race pivoting ball and the associated clevis. Thus high thrust loads are accommodated with limited secondary axis motion about the complementary spherical surfaces and primary motion is accommodated about the shaft or bolt center line radial bearings.
Inventors
- 👤 Robert E. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:32
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/38; B64C3/40; F; F16; F16C; F16C11/00; F16C11/04; F16C11/06; F16C11/0614; F16C2326/00; F16C2326/43; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32631; Y10T403/32681; Y10T403/32704; Y10T403/32861; Y10T403/32918; Y10T403/32926
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
193 words
In an airplane, a flexible joint comprising: an outer race, said outer race having a concave, truncated spherical inner surface which terminates in a circle at the plane of the truncation and a cylindrical outer surface; an inner race, said inner race having a convex spherical outer surface is complimentary,, sliding engagement with said concave inner surface of said outer race, said convex spherical outer surface terminating about an axis in lateral cylindrical extensions provided with necked down sections followed by an enlarged flange essentially equal in diameter to the diameter of said circle at the plane of truncation of said spherical inner surface of said inner race and terminating perpendicular to said axis so as to provide rotational clearance for said outer race oblique to said axis while providing an enlarged bearing surface, and with a through bore provided on said axis; a radial bearing provided in said bore; and thrust bearing means engaging said enlarged flange ends of said lateral, cylindrical extensions of said inner race whereby rotation about said axis takes place about said radial and thrust bearings and motion oblique to said axis takes place about said spherical surfaces.
Claim 2
Dependent Claim
193 words
In an airplane, a flexible joint comprising: an outer race, said outer race having a concave, truncated spherical inner surface which terminates in a circle at the plane of the truncation and a cylindrical outer surface; an inner race, said inner race having a convex spherical outer surface is complimentary,, sliding engagement with said concave inner surface of said outer race, said convex spherical outer surface terminating about an axis in lateral cylindrical extensions provided with necked down sections followed by an enlarged flange essentially equal in diameter to the diameter of said circle at the plane of truncation of said spherical inner surface of said inner race and terminating perpendicular to said axis so as to provide rotational clearance for said outer race oblique to said axis while providing an enlarged bearing surface, and with a through bore provided on said axis; a radial bearing provided in said bore; and thrust bearing means engaging said enlarged flange ends of said lateral, cylindrical extensions of said inner race whereby rotation about said axis takes place about said radial and thrust bearings and motion oblique to said axis takes place about said spherical surfaces.
Claim 3
Dependent Claim
33 words
The flexible joint of claim 1 wherein said outer surface of said outer race terminates at one distal end in a shoulder and the other distal end in means to receive a fastener.
Claim 4
Dependent Claim
42 words
The flexible joint of claim 1 further comprising clevis link means engaging said thrust bearing means, ball link means circumscribing said outer race, and a bolt through said clevis link means, said thrust bearing means and said bore in said inner race.
Claim 5
Dependent Claim
73 words
The flexible joint of claim 1 wherein said outer race is provided with a chamfer at the terminations of said concave, spherical inner surface whose angle is such that when said outer race is rotated to its limits at an oblique angle with respect to the axis of said inner race, said chamfer is parallel to said necked down section of said lateral cylindrical extensions of said spherical surface of said inner race.
Claim 6
Dependent Claim
27 words
The flexible joint of claim 1 wherein said outer race concave, spherical inner surface, said radial bearings and said thrust bearing means are made from self-lubricating materials.
Claim 7
Dependent Claim
12 words
The flexible joint of claim 5 wherein said self-lubricating material is TEFLON.
Claim 8
Dependent Claim
190 words
In an airplane, a flexible structural joint for bussing two contiguous, segmented aerodynamic surfaces which rotate about oblique hinge lines, comprising: an outer race, said outer race having a concave, spherical, self-lubricating inner surface and a cylindrical outer surface which terminates at one distal end in a flange and the other distal end in means to receive a fastener; an inner race, said inner race having a convex spherical outer surface in complimentary, sliding engagement with said concave inner surface of said outer race, said convex spherical outer surface terminating about an axis in lateral cylindrical extensions provided with necked down sections to provide rotational clearance for said outer race oblique to said axis and with a through bore provided on said axis; a self-lubricating radial bearing provided in said bore; thrust bearing means engaging the ends of said lateral, cylindrical extensions of said inner race, clevis support means engaging said thrust bearing means; a ball link means circumscribing said outer race, abutting said flange, and secured thereto by a fastener; and a bolt through said clevis support means, said thrust bearing means and said bore in said inner race.
Claim 9
Dependent Claim
190 words
In an airplane, a flexible structural joint for bussing two contiguous, segmented aerodynamic surfaces which rotate about oblique hinge lines, comprising: an outer race, said outer race having a concave, spherical, self-lubricating inner surface and a cylindrical outer surface which terminates at one distal end in a flange and the other distal end in means to receive a fastener; an inner race, said inner race having a convex spherical outer surface in complimentary, sliding engagement with said concave inner surface of said outer race, said convex spherical outer surface terminating about an axis in lateral cylindrical extensions provided with necked down sections to provide rotational clearance for said outer race oblique to said axis and with a through bore provided on said axis; a self-lubricating radial bearing provided in said bore; thrust bearing means engaging the ends of said lateral, cylindrical extensions of said inner race, clevis support means engaging said thrust bearing means; a ball link means circumscribing said outer race, abutting said flange, and secured thereto by a fastener; and a bolt through said clevis support means, said thrust bearing means and said bore in said inner race.
Claim 10
Dependent Claim
28 words
The flexible structural joint of claim 7 wherein said outer race concave spherical inner surface, said radial bearing and said thrust bearing means are made from TEFLON fabric.
Claim 11
Dependent Claim
43 words
The flexible structural joint of claim 7 wherein said means to receive a fastener on said distal end of said outer surface of said outer race is a thread and said flexible joint further comprises a nut on said thread with locking means.
Claim 12
Dependent Claim
73 words
The flexible joint of claim 7 wherein said outer race is provided with a chamfer at the terminations of said concave, spherical inner surface whose angle is such that when said outer race is rotated to its limits at an oblique angle with respect to the axis of said inner race, said chamfer is parallel to said necked down section of said lateral cylindrical extensions of said spherical surface of said inner race.
References Cited (Backward Citations)
US2766079A
Cited
GB743267A
Cited
US2995813A
Cited
US3198563A
Cited
US3445908A
Cited
GB1302172A
Cited
US3516136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |