Patent US3857151A successfully refreshed from Google Patents.
US3857151A
Expired / Lapsed
US
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Method of making a radiator core
Assignee: YOUNG RADIATION CO
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Filing: 1973-10-15
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Granted: 1974-12-31
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Expires: 1993-10-15
Abstract
Abstract A method of forming the ends of flat tubes into round cross section by mechanically expanding the ends without excessive work hardening the metal, forming serrations or threads in the header plate in which the ends are to be secured, then inserting the rounded ends of the tube into the serrated hole, and then inserting an expanding tool into the rounded end so that the round end is expanded into the threaded or serrated portion and thereby forming a solderless joint or one which requires no brazing and which joint resists failure from continuous shock and vibration and high temperature changes.
Inventors
- 👤 F Young
- 👤 W Astrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:18
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49375; Y10T29/49377; Y10T29/49378; Y10T29/4938; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
The process of making a radiator core having flat tubes with circular cross section ends in complementary holes in a header plate comprising, assembling fins on the flat tubes and securing them thereto, expanding and forming the ends of the flat tubes into circular cross section by pressing a tool into said ends without rotating the tool and without work hardening thereof, forming threads of a size of about 40 threads per inch in said holes of said header plate in which the circular ends are to be inserted, inserting said circular ends in said threads, expanding said circular ends to cause the metal of said ends to be deformed into said threads of said holes and create a fluid tight and solderless joint between said tube ends and said header plate.
Claim 2
Dependent Claim
132 words
The process of making a radiator core having flat tubes with circular cross section ends in complementary holes in a header plate comprising, assembling fins on the flat tubes and securing them thereto, expanding and forming the ends of the flat tubes into circular cross section by pressing a tool into said ends without rotating the tool and without work hardening thereof, forming threads of a size of about 40 threads per inch in said holes of said header plate in which the circular ends are to be inserted, inserting said circular ends in said threads, expanding said circular ends to cause the metal of said ends to be deformed into said threads of said holes and create a fluid tight and solderless joint between said tube ends and said header plate.
Claim 3
Dependent Claim
24 words
The process set forth in claim 1 further characterized in that said threads are formed only adjacent an outer side of said header plate.
Claim 4
Dependent Claim
148 words
The process of making a large heavy duty radiator core having flat tubes with circular cross section ends which are inserted in complementary holes in a header plate comprising, assembling fins on the flat tubes and securing them thereto, expanding the ends of the flat tubes into generally circular cross section to deform said ends by pressing a tool into said ends without rotating the tool and without excessive work hardening thereof, sizing the generally circular cross sections, forming threads of a size of about 40 threads per inch in said holes of said header plate in which the circular ends are to be inserted, inserting said circular ends in said threaded holes, expanding said ends to cause the metal of said ends to be deformed into said threads of said holes and create a fluid tight and solderless joint between said tube ends and said header plate.
Claim 5
Dependent Claim
148 words
The process of making a large heavy duty radiator core having flat tubes with circular cross section ends which are inserted in complementary holes in a header plate comprising, assembling fins on the flat tubes and securing them thereto, expanding the ends of the flat tubes into generally circular cross section to deform said ends by pressing a tool into said ends without rotating the tool and without excessive work hardening thereof, sizing the generally circular cross sections, forming threads of a size of about 40 threads per inch in said holes of said header plate in which the circular ends are to be inserted, inserting said circular ends in said threaded holes, expanding said ends to cause the metal of said ends to be deformed into said threads of said holes and create a fluid tight and solderless joint between said tube ends and said header plate.
Claim 6
Dependent Claim
24 words
The process set forth in claim 3 further characterized in that said threads are formed only adjacent an outer sIde of said header plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |