US3976247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-temperature melting metals spray-gun
Assignee: Individual
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Filing: 1975-12-22
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Granted: 1976-08-24
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Expires: 1995-12-22
Abstract
Abstract A low temperature melting metal such as tin, is contained in a small pot, heated by the flame of a burner. The metal is drawn from the bottom of the pot through a spray nozzle by venturi action of an air jet which forcefully throws molten droplets of metal against the surface to be coated. Means associated with the pot are provided to preheat the air stream before it comes into contact with the molten metal. Advantageously, the pot is closed by a cover, and air under pressure is supplied to the top of the pot, so as to force the molten metal towards the spray nozzle.
Inventors
- 👤 Maniglia Carmelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/20; B05B7/208; C; C23; C23C; C23C4/00; C23C4/12; C23C4/123
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A low temperature melting metals spray gun comprising in combination a pot for the metal to be sprayed, means for heating said pot, a spray nozzle mounted at the bottom of said pot and comprising an innermost nozzle communicating with the interior of the pot through a needle valve, and a concentric outer nozzle communicating with an air feed duct, a handle secured to said pot and provided with manually operable trigger means controlling the operation of the needle valve of the metal spray nozzle and the operation of an air cut-off valve mounted in a duct connected at one end to a compressed air source and at its other end to the inlet of an air circulating chamber mounted in heat-exchange relation with said pot, and having its outlet connected to the air feed duct of said outer nozzle.
Claim 2
Dependent Claim
140 words
A low temperature melting metals spray gun comprising in combination a pot for the metal to be sprayed, means for heating said pot, a spray nozzle mounted at the bottom of said pot and comprising an innermost nozzle communicating with the interior of the pot through a needle valve, and a concentric outer nozzle communicating with an air feed duct, a handle secured to said pot and provided with manually operable trigger means controlling the operation of the needle valve of the metal spray nozzle and the operation of an air cut-off valve mounted in a duct connected at one end to a compressed air source and at its other end to the inlet of an air circulating chamber mounted in heat-exchange relation with said pot, and having its outlet connected to the air feed duct of said outer nozzle.
Claim 3
Dependent Claim
53 words
A low temperature melting metals spray gun according to claim 1, further comprising a removable cover for closing the said pot in an air tight manner, and conduit means for supplying compressed air into said pot at a position below said cover and above the level of the molten metal in said pot.
Claim 4
Dependent Claim
29 words
A low temperature melting metals spray gun according to claim 1, in which the said air circulating chamber is in the form of a cylindrical jacket surrounding said pot.
Claim 5
Dependent Claim
183 words
A low temperature meltng metals spray gun comprising in combination a pot for the metal to be sprayed, means for heating said pot, a spray nozzle mounted at the bottom of said pot and comprising an innermost nozzle communicating with the interior of the pot through a needle valve and a concentric outer nozzle, a handle secured to said pot and provided with manually operable trigger means controlling the operation of the needle valve of the metal spray nozzle and the operation of an air cut-off valve mounted in an air feed duct connected at one end to a compressed air source, a cylindrical jacket, open at its upper end, surrounding said pot, duct means for connecting said jacket to said air feed duct and to said concentric outer nozzle, a removable cover for closing in an air tight manner said pot and the upper end of said concentric cylindrical jacket, and conduit means in said cover for connecting the interior of said jacket to the interior of said pot at a position above the level of the molten metal in said pot.
Claim 6
Dependent Claim
183 words
A low temperature meltng metals spray gun comprising in combination a pot for the metal to be sprayed, means for heating said pot, a spray nozzle mounted at the bottom of said pot and comprising an innermost nozzle communicating with the interior of the pot through a needle valve and a concentric outer nozzle, a handle secured to said pot and provided with manually operable trigger means controlling the operation of the needle valve of the metal spray nozzle and the operation of an air cut-off valve mounted in an air feed duct connected at one end to a compressed air source, a cylindrical jacket, open at its upper end, surrounding said pot, duct means for connecting said jacket to said air feed duct and to said concentric outer nozzle, a removable cover for closing in an air tight manner said pot and the upper end of said concentric cylindrical jacket, and conduit means in said cover for connecting the interior of said jacket to the interior of said pot at a position above the level of the molten metal in said pot.
Claim 7
Dependent Claim
47 words
A low temperature melting metals spray gun according to claim 1, further comprising holder means secured to the lower end of said handle for removeably fastening a burner, said holder means being further provided with rest means for the forearm of the user of the spray gun.
Claim 8
Dependent Claim
38 words
A low temperature melting metals spray gun according to claim 4, in which valve means are provided in said conduit means in said cover for adjusting the valve of the pressure of the air supplied to said pot.
Claim 9
Dependent Claim
47 words
A low temperature melting metals spray gun according to claim 1, in which said heating means comprises a burner disposed so as to heat the bottom of said pot, the pot bottom being substantially parallel or slightly inclined with respect to the longitudinal axis of said burner.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |