US3597833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of performing a brazing operation on terminal structure of metal braid
Assignee: General Electric Co
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Filing: 1969-09-03
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Granted: 1971-08-10
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Expires: 1989-09-03
Abstract
Abstract In this method, a tubular end ferrule is placed about the end of a short length of metal braid, and this assembly is placed in a chamber with the ferrule projecting through a hole in the chamber wall. A flow of nonoxidizing gas, such as nitrogen, is introduced into the chamber to form a blanket of nonoxidizing gas around the braid. While this blanket is present, heat is applied to the ferrule portion outside the chamber as part of a brazing operation that raises the temperature of the ferrule and the braid to a high level. After such heating, liquid nitrogen is introduced into the chamber to rapidly cool the braid and the ferrule.
Inventors
- 👤 Oscar C Frederick
- 👤 Albert C Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:56
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; B23K1/00; B23K1/0008
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
236 words
A method of making a brazed joint in terminal structure at the end of highly-conductive metal braid comprising: a. attaching a portion of said terminal structure to said braid, b. placing the braid in a chamber with the end of said braid and part of said attached terminal structure portion projecting through a hole in the chamber wall into a space outside the chamber, c. filling said chamber with a gas that is nonoxidizing with respect to the materIal of said braid to displace air from the region around said braid and form a blanket of nonoxidizing gas about the portion of said braid within said chamber, d. applying brazing metal and heat to the portion of said terminal structure outside said chamber to cause said terminal structure portion and said brazing metal to reach a high temperature that melts said brazing metal, e. said blanket of nonoxidizing gas being maintained about said braid inside said chamber while said heat is applied to said terminal structure portion, f. then introducing into said chamber a low temperature fluid that envelopes said braid and rapidly cools said braid, said terminal structure, and said brazing metal, g. said fluid entering said chamber at a temperature below 0* C. and being a substance that has a boiling point below 0* C. and that in both the liquid and vapor states is nonoxidizing with respect to the metal of said braid.
Claim 2
Dependent Claim
38 words
The method of claim 1 in which said ferrule is deformed following positioning thereof about the end of said braid so as to form an assembly of noncircular cross section in which said ferrule tightly grips the braid.
Claim 3
Dependent Claim
24 words
The method of claim 1 in which said nonoxidizing gas is nitrogen and said fluid coolant is liquid nitrogen when introduced into said chamber.
Claim 4
Dependent Claim
18 words
The method of claim 1 in which said fluid coolant is liquid nitrogen when introduced into said chamber.
Claim 5
Dependent Claim
18 words
The method of claim 1 in which said fluid coolant is a liquid when introduced into said chamber.
Claim 6
Dependent Claim
95 words
The method of claim 1 in which an additional metal part is brazed to the portion of said end ferrule outside said chamber, the brazing of said additional part to said ferrule being performed by a. placing brazing metal between said ferrule and said additional metal part, b. heating said ferrule, said additional part, and said interposed brazing metal by applying heat thereto outside said chamber while said braid inside said chamber is blanketed by said nonoxidizing gas, and c. utilizing said low temperature fluid introduced into said chamber for cooling said additional metal part.
Claim 7
Dependent Claim
44 words
The method of claim 1 in which said nonoxidizing gas, after being introduced into said chamber, is forced to flow through a porous structure before reaching the immediate vicinity of said braid, thereby facilitating displacement of air from the immediate vicinity of said braid.
Claim 8
Dependent Claim
44 words
The method of claim 1 in which said low temperature fluid coolant is caused to begin flowing into said chamber while said nonoxidizing gas is still being introduced into said chamber, thereby reducing the chance for air leakage into said chamber during this period.
Claim 9
Dependent Claim
23 words
The method of claim 2 in which nonoxidizing gas is nitrogen and said fluid coolant is liquid nitrogen when introduced into said chamber.
Claim 10
Dependent Claim
18 words
The method of claim 2 in which said fluid coolant is liquid nitrogen when introduced into said chamber.
Claim 11
Dependent Claim
18 words
The method of claim 2 in which said fluid coolant is a liquid when introduced into said chamber.
Claim 12
Dependent Claim
44 words
The method of claim 2 in which said nonoxidizing gas, after being introduced into said chamber, is forced to flow through a porous structure before reaching the immediate vicinity of said braid, thereby facilitating displacement of air from the immediate vicinity of said braid.
Claim 13
Dependent Claim
44 words
The method of claim 2 in which said low temperature fluid coolant is caused to begin flowing into said chamber while said nonoxidizing gas is still being introduced into said chamber, thereby reducing the chance for air leakage into said chamber during this period.
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |