US3632952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric arc metal spray gun
Assignee: Metco Inc
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Filing: 1970-07-01
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Granted: 1972-01-04
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Expires: 1990-07-01
Abstract
Abstract An arc spray gun is provided for melting the ends of two electrically isolated metal wires in an electric arc struck between their ends and spraying the molten metal onto a work piece to be coated, for example, and includes a pair of hollow electrodes connected to a source of electric current, two pairs of wire feed rollers for feeding a metal wire through each of the electrodes, an air jet nozzle positioned adjacent the ends of the electrodes and connected to a source of compressed air and the ends of the electrodes being fixedly secured relative to each other and the air jet nozzle to insure proper contact of the wires for arc formation and uniform atomization of the molten metal. A plenum chamber surrounding the electrodes and the air jet nozzle, and connected to a source of compressed air is also provided. The chamber has a spray opening and is adapted to feed a stream of annular air about the electrodes and the air jet nozzle which flows out through the spray opening resulting in control of the spray pattern and coating metallurgy.
Inventors
- 👤 Anthony J Rotolico
- 👤 William A Vogts
- 👤 Henry C Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:30
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/224
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
156 words
Arc spray gun for melting the ends of two electrically isolated metal wires in an electric arc struck between their ends and spraying molten metal, comprising: a. a pair of hollow electrodes connected to a source of current; b. means for feeding a metal wire through each of said electrodes; c. an air jet nozzle positioned adjacent the ends of said electrodes and connected connected to a source of compressed air; d. a chamber enclosing said electrodes and said air jet nozzle having a spray opening and being connected to a source of compressed air, said chamber being adapted to feed annular air about said electrodes and said air jet nozzle which flows out through said spray opening without disturbing said arc; and e. means for fixedly securing the ends of said electrodes relative to each other and said air jet nozzle to insure proper contact for arc formation and uniform atomization of the molten metal.
Claim 2
Dependent Claim
156 words
Arc spray gun for melting the ends of two electrically isolated metal wires in an electric arc struck between their ends and spraying molten metal, comprising: a. a pair of hollow electrodes connected to a source of current; b. means for feeding a metal wire through each of said electrodes; c. an air jet nozzle positioned adjacent the ends of said electrodes and connected connected to a source of compressed air; d. a chamber enclosing said electrodes and said air jet nozzle having a spray opening and being connected to a source of compressed air, said chamber being adapted to feed annular air about said electrodes and said air jet nozzle which flows out through said spray opening without disturbing said arc; and e. means for fixedly securing the ends of said electrodes relative to each other and said air jet nozzle to insure proper contact for arc formation and uniform atomization of the molten metal.
Claim 3
Dependent Claim
26 words
Arc spray gun of claim 1 wherein said air jet nozzle is provided with two seats in which the ends of said electrodes are fixedly secure.
Claim 4
Dependent Claim
19 words
Arc spray gun of claim 2 wherein said electrode ends are fixedly secured in said seats by eccentric cams.
Claim 5
Dependent Claim
41 words
Arc spray gun of claim 1 wherein air jet nozzle comprises two air jets parallel to each other and to the longitudinal axis of said gun and positioned above and below the point of contact and arcing between said metal wires.
Claim 6
Dependent Claim
43 words
Arc spray gun of claim 1 wherein said means for feeding metal wire through each of said electrodes comprises two pairs of wire feed rollers, one roller from each pair being connected to a common drive shaft and electrically insulated from each other.
Claim 7
Dependent Claim
75 words
Arc spray gun of claim 5 wherein the other rollers from each pair are each positioned in a housing pivotally mounted for pivoting each roller toward and away from the other roller connected to the common drive shaft, and wherein pneumatic piston cylinders are provided each having a plunger for actuation contact with said housings to pivot the rollers positioned therein in the direction moving them toward the rollers connected to the common drive shaft.
Claim 8
Dependent Claim
18 words
Arc spray gun of claim 5 wherein said common drive shaft is gear driven by an air turbine.
Claim 9
Dependent Claim
45 words
Arc spray gun of claim 1 which includes switch means for saId source of current adapted to supply current to said electrodes after wire feeding stops for a period of time sufficient to melt the ends of said wires so that they are not touching.
Claim 10
Dependent Claim
185 words
Arc spray gun for melting the ends of two metal wires in an electric arc struck between the wire ends and spraying molten metal comprising: a. a pair of hollow electrodes connected to a source of current; b. wire feed roller means for feeding metal wire through each of said electrodes; c. an air jet nozzle positioned in the same horizontal plane as and adjacent to the ends of said electrodes and connected to a source of compressed air, said nozzle having two air jets parallel to each other and to the longitudinal axis of said gun and positioned above and below a horizontal line drawn through the centers of said electrodes; d. a chamber enclosing said electrodes and said air jet nozzle having a spray opening and being connected to a source of compressed air, said chamber being adapted to feed annular air about said electrodes and said air jet nozzle which flows out through said spray opening; and e. means for fixedly securing the ends of said electrodes against said air jet nozzle to insure proper contact of the wires for arc formation.
Claim 11
Dependent Claim
185 words
Arc spray gun for melting the ends of two metal wires in an electric arc struck between the wire ends and spraying molten metal comprising: a. a pair of hollow electrodes connected to a source of current; b. wire feed roller means for feeding metal wire through each of said electrodes; c. an air jet nozzle positioned in the same horizontal plane as and adjacent to the ends of said electrodes and connected to a source of compressed air, said nozzle having two air jets parallel to each other and to the longitudinal axis of said gun and positioned above and below a horizontal line drawn through the centers of said electrodes; d. a chamber enclosing said electrodes and said air jet nozzle having a spray opening and being connected to a source of compressed air, said chamber being adapted to feed annular air about said electrodes and said air jet nozzle which flows out through said spray opening; and e. means for fixedly securing the ends of said electrodes against said air jet nozzle to insure proper contact of the wires for arc formation.
Claim 12
Dependent Claim
70 words
Process for spraying molten metal in a controlled spray pattern which comprises: a. feeding and melting the ends of two metal wires in an electric arc struck between the wire ends; b. spraying the molten metal without disturbing the arc with two air jets parallel to each other and parallel to the direction of spray and positioned above and below the point of contact and arcing between said metal wires.
Claim 13
Dependent Claim
70 words
Process for spraying molten metal in a controlled spray pattern which comprises: a. feeding and melting the ends of two metal wires in an electric arc struck between the wire ends; b. spraying the molten metal without disturbing the arc with two air jets parallel to each other and parallel to the direction of spray and positioned above and below the point of contact and arcing between said metal wires.
Claim 14
Dependent Claim
38 words
Process of claim 10 wherein annular air under pressure surrounds said metal wires and said air jets and flows in the direction of spray without disturbing said arc whereby said molten metal is sprayed in a controlled pattern.
Claim 15
Dependent Claim
37 words
Process of claim 10 wherein the current causing the electric arc continues to flow after wire feeding stops for a period of time sufficient to melt the ends of said wires so that they are not touching.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |