Patent US2954955A successfully refreshed from Google Patents.
US3756489A
Expired / Lapsed
US
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Furnace for the brazing in continue of parts made of aluminium mainly of heat exchangers moved in a continue motion
Assignee: Chausson Usines SA
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Filing: 1972-08-04
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Granted: 1973-09-04
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Expires: 1992-08-04
Abstract
Abstract A furnace for the continuous brazing of aluminum work parts comprising a set of at least 4 adjacent communicating treatment chambers through which the parts to be brazed are successively passed, the chambers being provided with heating means, blowers and vents for circulating hot gas therethrough so as to maintain in the chambers successively higher temperatures and pressures to achieve proper brazing which takes place in the fourth chamber. Additional chambers may be provided for curing and cooling purposes.
Inventors
- 👤 A Chartet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/008; B23K2103/00; B23K2103/08; B23K2103/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
204 words
Furnace for the continuous brazing of aluminum work parts comprising in combination: a. a set of at least 4 adjacent communicating work treatment chambers; b. conveyor means for continuously moving the work parts to be brazed successivey through said chambers; c. means for holding the work parts in position for brazing; d. means for applying an aqueous brazing flux to the work parts prior to their entry into the first chamber; e. the first of said chambers including means for circulating a hot gas therethrough to contact the work parts and to dry said flux; f. the second of said chambers including means for circulating a hot gas therethrough to raise the temperature of the work parts to a level below the melting temperature of the flux; g. the third of said chambers including heating means for raising the temperature of the working parts to a level above the melting temperature of the flux; h. the fourth of said chambers including heating means for raising the temperature of the work parts to the brazing temperature, and i. said gas circulating and said heating means being adapted to maintain in said chambers successively higher temperatures and pressures to achieve proper brazing of said work parts.
Claim 2
Dependent Claim
204 words
Furnace for the continuous brazing of aluminum work parts comprising in combination: a. a set of at least 4 adjacent communicating work treatment chambers; b. conveyor means for continuously moving the work parts to be brazed successivey through said chambers; c. means for holding the work parts in position for brazing; d. means for applying an aqueous brazing flux to the work parts prior to their entry into the first chamber; e. the first of said chambers including means for circulating a hot gas therethrough to contact the work parts and to dry said flux; f. the second of said chambers including means for circulating a hot gas therethrough to raise the temperature of the work parts to a level below the melting temperature of the flux; g. the third of said chambers including heating means for raising the temperature of the working parts to a level above the melting temperature of the flux; h. the fourth of said chambers including heating means for raising the temperature of the work parts to the brazing temperature, and i. said gas circulating and said heating means being adapted to maintain in said chambers successively higher temperatures and pressures to achieve proper brazing of said work parts.
Claim 3
Dependent Claim
33 words
The furnace of claim 1 which further includes a fifth chamber communicating with said fourth chamber including means for circulating a hot gas therethrough to maintain the temperature of said brazed work parts.
Claim 4
Dependent Claim
25 words
The furnace of claim 2 which includes a sixth chamber communicating with said fifth chamber, including means for tempering and cooling the brazed work parts.
Claim 5
Dependent Claim
23 words
The furnace of claim 3 in which said tempering and cooling means includes means for spraying a cooling medium onto said work parts.
Claim 6
Dependent Claim
28 words
The furnace of claim 2 in which said hot gas circulating means includes means for adjusting the flow of said gas to gently pre-cool said brazed work parts.
Claim 7
Dependent Claim
67 words
The furnace of claim 2 in which the means for circulating hot gaS are adapted to maintain pressure of the hot gas in the chamber decreasing from the fourth chamber to the first chamber and to maintain substantially the same pressure in the fifth chamber and in the third chamber thereby preventing gas at a lower temperature from entering the fourth chamber in which brazing is performed.
Claim 8
Dependent Claim
30 words
The furnace of claim 1 in which the hot gas circulating means in the first and second chamber comprises a gas burner, a blower, and a gas inlet and outlet.
Claim 9
Dependent Claim
29 words
The furnace of claim 1 in which the said heating means in the third and fourth chambers comprises an electrical resistance, a blower, and a gas inlet and outlet.
Claim 10
Dependent Claim
24 words
The furnace of claim 1 in which said third and fourth chambers include means for the introduction of additional gas to compensate for leakage.
Claim 11
Dependent Claim
71 words
The furnace of claim 1 which includes blower means located outside each of said chambers for introducing gas thereto, means for heating the gas located within said chambers, conduits for conveying the gas into the interior of the chamber and past the heating means, and thence carrying the hot gas past said work parts, and a ventilating shaft in the upper portion of the chamber for removal of used hot gas.
Claim 12
Dependent Claim
21 words
The furnace of claim 10 in which said conduit is a ring-shaped sheath defining a combustion zone adjacent said heating means.
Claim 13
Dependent Claim
42 words
The furnace of claim 1 in which said second chamber includes conduit means for recovering hot gas leaving the work parts and for conveying the gas partly to said first chamber and partly to recycle the gas back to said second chamber.
Claim 14
Dependent Claim
33 words
The furnace of claim 1 in which said conveyor means comprises longitudinal grates and said chambers are defined by the differences of temperature and pressure of the hot gas circulating through said grates.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |