US4272971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced tubular structure
Assignee: Meritor Heavy Vehicle Systems LLC
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Filing: 1979-02-26
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Granted: 1981-06-16
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Expires: 1999-02-26
Abstract
Abstract A reinforced tubular structure comprising a metal tube and a cured composite tubular liner which increases the longitudinal stiffness of the tubular structure, the liner being adhesively bonded to the inner peripheral surface of the metal tube. The reinforced tubular structure is fabricated by forming a laminate of the composite material, wrapping it around a flexible mandrel, inserting the mandrel and wrapped laminate into the metal tube, and co-curing the laminate to the inner peripheral surface of the tube.
Inventors
- 👤 Morris S. Loyd
- 👤 Timothy W. McGann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
B; B29; B29C; B29C63/00; B29C63/26; B29C63/28; B29C63/0017; B29C63/0021; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/202; B29C70/68; B29C70/86; F; F16; F16C; F16C3/00; F16C3/02; F16C3/026; Y; Y10; Y10S; Y10S464/00; Y10S464/902; Y10S464/903
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
78 words
A reinforced tubular structure comprising: a metal tube, said metal tube having inner and outer peripheral surfaces: a cured composite tubular liner within said metal tube adhesively bonded to said inner peripheral surface of said metal tube, said liner comprising a plurality of plies of fibrous material in a solid resin matrix, said liner increasing the longitudinal stiffness of said tubular structure, said liner having a longitudinal Young's Modulus to density ratio greater than for the metal tube.
Claim 2
Dependent Claim
78 words
A reinforced tubular structure comprising: a metal tube, said metal tube having inner and outer peripheral surfaces: a cured composite tubular liner within said metal tube adhesively bonded to said inner peripheral surface of said metal tube, said liner comprising a plurality of plies of fibrous material in a solid resin matrix, said liner increasing the longitudinal stiffness of said tubular structure, said liner having a longitudinal Young's Modulus to density ratio greater than for the metal tube.
Claim 3
Dependent Claim
12 words
The structure of claim 1 wherein said liner has a variable thickness.
Claim 4
Dependent Claim
16 words
The structure of claim 2 wherein said liner tapers from the middle to the ends thereof.
Claim 5
Dependent Claim
23 words
The structure of claim 1 wherein said fibrous material has a longitudinal Young's Modulus greater than for the metal of said metal tube.
Claim 6
Dependent Claim
23 words
The structure of claim 2 wherein said fibrous material has a longitudinal Young's Modulus greater than for the metal of said metal tube.
Claim 7
Dependent Claim
23 words
The structure of claim 3 wherein said fibrous material has a longitudinal Young's Modulus greater than for the metal of said metal tube.
Claim 8
Dependent Claim
28 words
The structure of claim 3 wherein said fibrous material is in the form of a plurality of lineally aligned parallel filaments which are substantially continuous through respective plies.
Claim 9
Dependent Claim
24 words
The structure of claim 1 wherein said resin matrix provides at least a portion of said adhesive bonding of said liner to said tube.
Claim 10
Dependent Claim
23 words
The structure of claim 8 wherein an adhesive provides at least a portion of said adhesive bonding of said liner to said tube.
Claim 11
Dependent Claim
28 words
The structure of claim 1 wherein said fibrous material is in the form of a plurality of lineally aligned parallel filaments which are substantially continuous through respective plies.
Claim 12
Dependent Claim
26 words
The structure of claim 1 wherein the majority of fibers of said fibrous material are disposed substantially parallel to the longitudinal axis of said metal tube.
Claim 13
Dependent Claim
26 words
The structure of claim 2 wherein the majority of fibers of said fibrous material are disposed substantially parallel to the longitudinal axis of said metal tube.
Claim 14
Dependent Claim
26 words
The structure of claim 3 wherein the majority of fibers of said fibrous material are disposed substantially parallel to the longitudinal axis of said metal tube.
Claim 15
Dependent Claim
26 words
The structure of claim 4 wherein the majority of fibers of said fibrous material are disposed substantially parallel to the longitudinal axis of said metal tube.
Claim 16
Dependent Claim
42 words
The structure of claim 2 also including a pair of metal end members respectively connected to the ends of said metal tube such that said liner is incased, whereby protection for said liner from foreign object damage and environmental effects is provided.
Claim 17
Dependent Claim
42 words
The structure of claim 14 also including a pair of metal end members respectively connected to the ends of said metal tube such that said liner is incased, whereby protection for said liner from foreign object damage and environmental effects is provided.
Claim 18
Dependent Claim
27 words
The structure of claim 16 wherein the metal of said metal tube is steel, said fibrous material is graphite, and said resin matrix is an epoxy matrix.
Claim 19
Dependent Claim
22 words
The structure of claim 11 wherein a portion of said fibers is disposed in a substantially circumferential orientation relative to said liner.
Claim 20
Dependent Claim
22 words
The structure of claim 14 wherein a portion of said fibers is disposed in a substantially circumferential orientation relative to said liner.
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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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |