US4395025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the continuous furnace brazing and gas soft-nitriding treatments of iron articles
Assignee: Honda Motor Co Ltd
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Filing: 1981-09-24
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Granted: 1983-07-26
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Expires: 2001-09-24
Abstract
Abstract A method for continuously treating an iron member wherein the iron member is first subjected to furnace-brazing in a controlled gas environment and subsequently to a soft-nitriding treatment by addition of ammonia gas (NH 3 ) to the controlled gas for the brazing. An apparatus for carrying out the method is also provided, and includes three partitioned chambers for brazing, annealing and soft-nitriding the iron member, each chamber being partitioned by a member such as a stainless steel film curtain at opposite sides thereof. A controlled gas feed system communicates with each of the chambers, and an ammonia gas feed system is connected to the soft-nitriding chamber.
Inventors
- 👤 Teruoki Watanabe
- 👤 Tadao Kanno
- 👤 Akio Hidaka
- 👤 Shunji Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; B23K1/00; B23K1/008; C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/24; C23C8/26; C23C8/28; C23C8/30; C23C8/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A continuous treatment furnace for brazing and gas soft-nitriding iron parts, comprising: a furnace body including: a brazing chamber for brazing said iron parts in a protecting atmosphere substantially comprising a controlled gas for brazing; a furnace cooling chamber, provided subsequent to said brazing chamber, for gradually cooling said iron parts in a protecting atmosphere substantially comprising said controlled gas; and a gas soft-nitriding chamber, provided subsequent to said furnace cooling chamber, for gas soft-nitriding said iron parts in a gas soft-nitriding atmosphere substantially comprising said controlled gas and an ammonia gas; a protecting gas supply line branched to feed said controlled gas to said brazing chamber, said furnace cooling chamber, and said gas soft-nitriding chamber; an ammonia gas supply line connected to feed said ammonia gas to said gas soft-nitriding chamber; said chambers being provided with partition walls therebetween; each said partition wall being provided with an opening therein to permit communication between said chambers; and a shielding steel curtain being disposed so as to cover each said opening while permitting said iron parts to be passed therethrough.
Claim 2
Dependent Claim
179 words
A continuous treatment furnace for brazing and gas soft-nitriding iron parts, comprising: a furnace body including: a brazing chamber for brazing said iron parts in a protecting atmosphere substantially comprising a controlled gas for brazing; a furnace cooling chamber, provided subsequent to said brazing chamber, for gradually cooling said iron parts in a protecting atmosphere substantially comprising said controlled gas; and a gas soft-nitriding chamber, provided subsequent to said furnace cooling chamber, for gas soft-nitriding said iron parts in a gas soft-nitriding atmosphere substantially comprising said controlled gas and an ammonia gas; a protecting gas supply line branched to feed said controlled gas to said brazing chamber, said furnace cooling chamber, and said gas soft-nitriding chamber; an ammonia gas supply line connected to feed said ammonia gas to said gas soft-nitriding chamber; said chambers being provided with partition walls therebetween; each said partition wall being provided with an opening therein to permit communication between said chambers; and a shielding steel curtain being disposed so as to cover each said opening while permitting said iron parts to be passed therethrough.
Claim 3
Dependent Claim
38 words
A continuous treatment furnace according to claim 1, further comprising: a conveyor extending along said furnace body so as to continuously carry said iron parts through said brazing chamber, said furnace cooling chamber and said gas soft-nitriding chamber.
Claim 4
Dependent Claim
27 words
A continuous treatment furnace according to claim 2, wherein: said shielding steel curtains have lower ends thereof in sliding contact with an upper surface of said conveyor.
Claim 5
Dependent Claim
19 words
A continuous treatment furnace according to claim 1, wherein: said gas soft-nitriding chamber is provided with an agitator means.
Claim 6
Dependent Claim
67 words
A continuous treatment furnace according to claim 1, wherein: said furnace body includes a front wall provided with an inlet port adjacent said brazing chamber and further includes a rear wall provided with an outlet port adjacent said gas soft-nitriding chamber; and shielding steel curtains are disposed so as to cover said inlet port and said outlet port while permitting said iron parts to be passed therethrough.
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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) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |