US3938964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beryllium reinforced composite solid and hollow shafting
Assignee: United States Department of the Navy
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Filing: 1974-03-18
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Granted: 1976-02-17
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Expires: 1994-03-18
Abstract
Abstract A solid or hollow shaft has an aluminum or titanium matrix reinforced withrcuate-shaped beryllium ribbons arranged around a central rod or core to form a circular cross-sectional configuration. The shaft has a high degree of torsional stiffness which enables it to be used on advanced aircraft or high-speed rotating machinery without mid-support bearings. The shaft may be formed by cladding the beryllium rods in aluminum or titanium and arranging them around the central rod or core to form a preform with a circular cross-sectional configuration. The preform is then subjected to hydrostatic pressure, causing the beryllium rods to deform into arcuate-shaped ribbons. The core may then be retained or leached out to provide a hollow shaft.
Inventors
- 👤 Richard Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:15
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/02; C22C47/06; C22C47/062; C22C47/068; C22C47/04; C22C49/00; C22C49/02; C22C49/04; B; B22; B22F; B22F2998/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12486; Y10T428/12493; Y10T428/12729
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A beryllium reinforced metal shaft comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix; said metal matrix being selected from the group consisting of aluminum and titanium; said arcuate, beryllium reinforcing ribbons arranged in said matrix to coincide with concentric circles whose centers coincide with the cent of the shaft, substantially each arcuate ribbon in any one circle overlapping in arcuate width an arcuate ribbon in another circle with matrix material therebetween.
Claim 2
Dependent Claim
76 words
A beryllium reinforced metal shaft comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix; said metal matrix being selected from the group consisting of aluminum and titanium; said arcuate, beryllium reinforcing ribbons arranged in said matrix to coincide with concentric circles whose centers coincide with the cent of the shaft, substantially each arcuate ribbon in any one circle overlapping in arcuate width an arcuate ribbon in another circle with matrix material therebetween.
Claim 3
Dependent Claim
15 words
The shaft of claim 1 having a central portion wherein the central portion is hollow.
Claim 4
Dependent Claim
56 words
A beryllium-reinforced metal shaft comprising: a plurality of arcuate, beryllium ribbons imbedded in a metal matrix and arranged around the longitudinal axis of the shaft to define a circular cross-section; said metal matrix being selected from the group consisting of aluminum and titanium; said shaft having a central portion which is a solid rod of beryllium.
Claim 5
Dependent Claim
56 words
A beryllium-reinforced metal shaft comprising: a plurality of arcuate, beryllium ribbons imbedded in a metal matrix and arranged around the longitudinal axis of the shaft to define a circular cross-section; said metal matrix being selected from the group consisting of aluminum and titanium; said shaft having a central portion which is a solid rod of beryllium.
Claim 6
Dependent Claim
66 words
A beryllium-reinforced metal shaft comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix; said metal matrix being selected from the group consisting of aluminum and titanium; said arcuate, beryllium reinforcing ribbons arranged in said matrix to coincide with concentric circles whose centers coincide with the center of the shaft, said shaft having a central portion which is a solid rod of beryllium.
Claim 7
Dependent Claim
66 words
A beryllium-reinforced metal shaft comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix; said metal matrix being selected from the group consisting of aluminum and titanium; said arcuate, beryllium reinforcing ribbons arranged in said matrix to coincide with concentric circles whose centers coincide with the center of the shaft, said shaft having a central portion which is a solid rod of beryllium.
Claim 8
Dependent Claim
87 words
A beryllium-reinforced metal shaft designed for use in rotating machinery, or as a control rod, without the need for mid-support bearings, comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix; said metal matrix being selected from the group consisting of aluminum and titanium; the radius of curvature of said arcuate, beryllium reinforcing ribbons arranged in said matrix being substantially the same as that of said shaft thereby to coincide with the center of the shaft, the central portion of said shaft being hollow.
Claim 9
Dependent Claim
87 words
A beryllium-reinforced metal shaft designed for use in rotating machinery, or as a control rod, without the need for mid-support bearings, comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix; said metal matrix being selected from the group consisting of aluminum and titanium; the radius of curvature of said arcuate, beryllium reinforcing ribbons arranged in said matrix being substantially the same as that of said shaft thereby to coincide with the center of the shaft, the central portion of said shaft being hollow.
Claim 10
Dependent Claim
69 words
A beryllium-reinforced metal shaft comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix, there being matrix material between adjacent arcuate ribbons, said metal matrix being selected from the group consisting of aluminum and titanium, the width of substantially each arcuate ribbon overlapping a portion of the width of an adjacent arcuate ribbon above or below it in radial direction from the center of said shaft.
Claim 11
Dependent Claim
69 words
A beryllium-reinforced metal shaft comprising: a plurality of arcuate, beryllium reinforcing ribbons imbedded in a metal matrix, there being matrix material between adjacent arcuate ribbons, said metal matrix being selected from the group consisting of aluminum and titanium, the width of substantially each arcuate ribbon overlapping a portion of the width of an adjacent arcuate ribbon above or below it in radial direction from the center of said shaft.
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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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |