Patent US3584903A successfully refreshed from Google Patents.
US3584903A
Expired / Lapsed
US
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Rolled channel joints
Assignee: Atomic Energy of Canada Ltd AECL
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Filing: 1968-04-29
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Granted: 1971-06-15
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Expires: 1988-04-29
Abstract
Abstract A strong and leak-free hub assembly for use with the pressure tubes of a nuclear reactor is disclosed in which the hub includes a hard insert having at least one groove formed in it, the hardness of the insert being greater than the hardness of the tubular element with which it is joined. Typically, the hub is formed of stainless steel, the insert is formed of surface hardened stainless steel and the tubular element is a zirconiumniobium alloy. The insert has a hardness greater than the hardness of the tubular element.
Inventors
- 👤 James David Pritchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:08
CPC Classifications
G; G21; G21C; G21C13/00; G21C13/02; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
In combination, a thin tubular element formed of a zirconiumniobium alloy and a hub assembly for making a sealed joint with said thin tubular element, said hub assembly comprising a hollow cylindrical stainless steel hub member, said member having a cylindrical inner surface provided with at least one groove for forming a mechanical joint with the end of said tubular element rolled into said grove, a cylindrical insert formed of surface hardened stainless steel, said insert being in said member and having a surface concentric with said cylindrical inner surface, said surface of said insert having a groove formed therein receiving a rolled portion of the tubular element, said insert having a hardness greater than said tubular element, and means for securing said insert to said hub member.
Claim 2
Dependent Claim
128 words
In combination, a thin tubular element formed of a zirconiumniobium alloy and a hub assembly for making a sealed joint with said thin tubular element, said hub assembly comprising a hollow cylindrical stainless steel hub member, said member having a cylindrical inner surface provided with at least one groove for forming a mechanical joint with the end of said tubular element rolled into said grove, a cylindrical insert formed of surface hardened stainless steel, said insert being in said member and having a surface concentric with said cylindrical inner surface, said surface of said insert having a groove formed therein receiving a rolled portion of the tubular element, said insert having a hardness greater than said tubular element, and means for securing said insert to said hub member.
Claim 3
Dependent Claim
22 words
The combination as claimed in claim 5 wherein said insert has a surface hardness of about at least 350 Brinell Hardness number.
Claim 4
Dependent Claim
29 words
The combination as claimed in claim 1 wherein said means for securing said insert to said hub member in a retaining ring which is fastened to said hub member.
References Cited (Backward Citations)
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Cited
US1589646A
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US2171217A
Cited
US2785459A
Cited
FR1346925A
Cited
US3438655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |