US3769675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for brazing aluminum radiators
Assignee: Chausson Usines SA
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Filing: 1970-09-04
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Granted: 1973-11-06
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Expires: 1990-09-04
Abstract
Abstract The method for brazing aluminum radiators with brazing alloys comprises the steps of suspending said radiators and continuously displacing them through successive portions of a single lengthwise elongated furnace cavity with rear and front surfaces of said radiators directed at right angles with respect to successive streams of hot gas blown into each of said successive portions of said furnace at different temperatures and in adjacent relationship therebetween. This disclosure relates to a novel method for brazing radiator cores all the parts thereof being made of aluminum or alluminum alloys and a part at least thereof being plated with a brazing alloy.
Inventors
- 👤 A Chartet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:24
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/02; B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K1/008; B23K1/012; B23K3/00; B23K3/08; B23K3/087; B23K2101/00; B23K2101/04; B23K2101/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49393; Y10T29/53; Y10T29/53113
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A method as claimed in claim 1, comprising the further step of adjusting the velocity of the stream of hot gas which is blown in a pre-heating zone of the furnace to be only slightly less than that velocity at which a flux coating on said radiators, which is melted by said hot gas, would be blown away and adjusting the velocity of the stream of hot gas blown in a brazing zone of said furnace adjacent the pre-heating zone, and in which said streams of hot gas heats said radiators to brazing temperature, to be substantially greater than the velocity of the stream of hot gas in the pre-heating zone.
Claim 2
Dependent Claim
66 words
A method as claimed in claim 1 comprising the further step of providing the stream of hot gas which is blown in a pre-cooling zone of said furnace adjacent a brazing zone of the furnace which is at a temperature less than the temperature of the stream of hot gas blown in said brazing zone, whereby the radiators are pre-cooled while travelling through said pre-cooling zone.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 2 wherein the radiators remain from 10 to 20 minutes in the preheating zone.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 2 wherein the radiators remain from 3 to 5 minutes in the brazing zone.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 3 wherein the radiators remain from 3 to 5 minutes in the brazing zone.
Claim 6
Dependent Claim
38 words
A method as claimed in claim 2 wherein the brazing alloys are silicon-aluminum alloys having 7.5 percent silicon and the temperature of the stream of hot gas blown in the pre-heating zone is 570* + or - 5*C
Claim 7
Dependent Claim
38 words
A method as claimed in claim 2 wherein the brazing alloys are silicon-aluminum alloys having 12 percent silicon and the temperature of the stream of hot gas blown in the pre-heating zone is 550* + or - 5*C
Claim 8
Dependent Claim
38 words
A method as claimed in claim 2 wherein the brazing alloys are silicon-aluminum alloys having 7.5 percent silicon and the temperature of the stream of hot gas blown in the brazing zone is 615* + or - 2*C
Claim 9
Dependent Claim
38 words
A method as claimed in claim 3 wherein the brazing alloys are silicon-aluminum alloys having 7.5 percent silicon and the temperature of the stream of hot gas blown in the brazing zone is 615* + or - 2*C.
Claim 10
Dependent Claim
38 words
A method as claimed in claim 2 wherein the brazing alloys are silicon-aluminum alloys having 12 percent silicon and the temperature of the stream of hot gas blown in the brazing zone is 600* + or - 2*C
Claim 11
Dependent Claim
38 words
A method as claimed in claim 3 wherein the brazing alloys are silicon-aluminum alloys having 12 percent silicon and the temperature of the stream of hot gas blown in the brazing zone is 600* + or - 2*C
Claim 12
Dependent Claim
26 words
A method as claimed in claim 3 wherein the temperature of the stream of hot gas blown in the pre-cooling zone is substantially equal to 300*C
Claim 13
Dependent Claim
26 words
A method as claimed in claim 1 wherein the streams of hot gas are blown at a velocity of substantially 4 to 6 meters per second.
Claim 14
Independent Claim
107 words
A method for brazing aluminum radiators with brazing alloys comprising the steps of continuously displacing said radiators into and longitudinally through an enclosure, said enclosure being defined by longitudinal walls having apertures for continuous communication of said enclosure with channels surrounding said walls and in which are located sets of heating means aand blowers for heating and circulating gas respectively in said enclosure and directing transversely successive streams of hot gas at different temperatures through said enclosure and into contact with said radiators, said streams themselves delimiting successive adjacent zones in said enclosure which correspond at least to preheating, brazing, and pre-cooling portions of a brazing cycle.
Claim 15
Dependent Claim
48 words
A method as claimed in claim 15 comprising the further step of providing cells which surround said radiators and which move within said enclosure while maintaining saId radiators normal to said streams of hot gas and forming successively closure members for said enclosure at inlet and outlet ends.
Claim 16
Dependent Claim
32 words
A method as claimed in claim 15, wherein said blowers each circulate gas heated by said heating means at different velocities to form streams of hot gas at different velocities and temperatures.
Claim 17
Dependent Claim
44 words
A method as claimed in claim 17 comprising the further step of including in said brazing cycle a drying portion having a drying stream of gas and being located before said pre-heating zone relative to direction of movement of said radiators through the enclosure.
Claim 18
Dependent Claim
46 words
A method as claimed in claim 17 comprising the further step of including in said brazing cycle a fluxing zone provided before said pre-heating zone relative to direction of movement of said radiators through the enclosure and in which said flux is sprayed upon said radiators.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |