US4024373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for plasma working of electrically-conductive materials and method of operating same
Assignee: Individual
•
Filing: 1976-05-05
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Granted: 1977-05-17
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Expires: 1996-05-05
Abstract
Abstract An apparatus for plasma working of electrically-conductive materials wherein a gas-cooled non-consumable electrode, insulator and a gas-cooled nozzle of a plasmatron are interlinked with one another so as to form a chamber subdivided by a gas-permeable partition so that one of its parts communicates with the atmosphere through a central passage of the nozzle serving to discharge plasma-forming gas and the other part of the chamber communicates with a source of plasma-forming and cooling gas and also with the atmosphere through an additional passage, the non-consumable electrode passing through this partition and being disposed coaxially with the central passage of the nozzle.
Inventors
- 👤 David Grigorievich Bykhovsky
- 👤 Alexandr Yakovlevich Medvedev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:32
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/38; B; B23; B23K; B23K10/00; H05H1/3421; H05H1/3442; H05H1/3436
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
An apparatus for plasma working of electrically-conductive materials comprising: a d.c. source of power whose positive terminal is connected to the workpiece; a plasmatron including a gas-cooled non-consumable electrode; comprising an insert and a holder; means connecting the electrode to the negative terminal of said d.c. power source; an insulator on said non-consumable electrode; a nozzle member fitted on said insulator and having a central passage for discharging plasma-forming gas; said non-consumable electrode, insulator and nozzle defining a chamber communicating with the atmosphere through said central passage; at least one additional passage means connecting said chamber with the atmosphere; a source of plasma-forming and cooling gas connected to said chamber at a location spaced from said additional passage means; a gas-permeable partition disposed in said chamber such that said non-consumable electrode passes through said partition which subdivides said chamber into two parts one of which communicates with the atmosphere through said central passage and the other of which communicates both with said source of plasma-forming and cooling gas and also with the atmosphere by way of said additional passage means.
Claim 2
Independent Claim
180 words
An apparatus for plasma working of electrically-conductive materials comprising: a d.c. source of power whose positive terminal is connected to the workpiece; a plasmatron including a gas-cooled non-consumable electrode; comprising an insert and a holder; means connecting the electrode to the negative terminal of said d.c. power source; an insulator on said non-consumable electrode; a nozzle member fitted on said insulator and having a central passage for discharging plasma-forming gas; said non-consumable electrode, insulator and nozzle defining a chamber communicating with the atmosphere through said central passage; at least one additional passage means connecting said chamber with the atmosphere; a source of plasma-forming and cooling gas connected to said chamber at a location spaced from said additional passage means; a gas-permeable partition disposed in said chamber such that said non-consumable electrode passes through said partition which subdivides said chamber into two parts one of which communicates with the atmosphere through said central passage and the other of which communicates both with said source of plasma-forming and cooling gas and also with the atmosphere by way of said additional passage means.
Claim 3
Dependent Claim
16 words
An apparatus as claimed in claim 1 wherein said central passage is coaxial with said insert.
Claim 4
Dependent Claim
47 words
An apparatus as claimed in claim 1 wherein said gas permeable partition provides resistance to gas flow from said source to said passage in the nozzle member and provides a ratio of gas flow between the nozzle member and said additional passage means between 2:12 and 3.5:20.
Claim 5
Dependent Claim
49 words
An apparatus as claimed in claim 1 comprising a shield covering said nozzle member and at least a portion of said insulator to define therewith a gap communicating with said chamber through said additional passage means, said shield being provided with holes to enable the cooling gas to escape.
Claim 6
Dependent Claim
29 words
An apparatus as claimed in claim 1 wherein said holder is made of copper or a copper-based alloy and said insert is made of hafnium or a hafnium-based alloy.
Claim 7
Dependent Claim
56 words
An apparatus as claimed in claim 1 wherein said holder is hollow, a pipe disposed in said holder and connected to the source of plasma-forming and cooling gases for admitting the gas into said holder, said holder having passages extending to that part of said chamber which communicates with the atmosphere through the additional passage means.
Claim 8
Dependent Claim
23 words
An apparatus as claimed in claim 1 wherein said additional passage means is constituted by at least one hole in said nozzle member.
Claim 9
Dependent Claim
16 words
An apparatus as claimed in claim 1, wherein the plasma-forming and cooling gas is compressed air.
Claim 10
Dependent Claim
15 words
An apparatus as claimed in claim 1, wherein the plasma-forming and cooling gas is oxygen.
Claim 11
Dependent Claim
36 words
An apparatus as claimed in claim 1, wherein the aggregate gas flow rate is between 60 cu.m/hr to 100 cu.m/hr, the proportion of plasma-forming gas being at least 7 percent of the aggregate gas flow rate.
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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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |