US3986668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety double injector spray device or torch
Assignee: Eutectic Corp
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Filing: 1975-12-23
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Granted: 1976-10-19
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Expires: 1995-12-23
Abstract
Abstract A safety double injector spray device or torch is provided for applying a spray coating to a substrate comprising, a torch body having a torch head at the end thereof, an oxygen duct and a fuel gas duct associated with said spray device and coupled to a first injector means for mixing oxygen and fuel gas therein, a fuel gas-oxygen mixing duct located forward of and coupled to said first injector means, a carrier gas duct associated with said spray device coupled to a second injector means for mixing spray powder with carrier gas fed to said duct, a carrier gas-spray powder mixing duct located forward of said second injector means, spray powder feeding means coupled to said torch body and communicating in powder feeding relationship with said carrier gas duct, and means forward of said first and said second injector means coupling said carrier gas-spray powder mixing duct and said fuel-gas oxygen mixing duct to said torch head.
Inventors
- 👤 Erwin Huhne
- 👤 Hans-Theo Steine
- 👤 Wolfgang Simm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:01
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/20; B05B7/201; B05B7/205; B05B7/206
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
160 words
A safety double injector spray device for applying a spray coating to a substrate comprising, a torch body having a torch head with a nozzle at the end thereof, an oxygen duct and a fuel gas duct associated with said spray device and coupled to a first injector means for mixing oxygen and fuel gas therein, a fuel gas-oxygen mixing duct located forward of and coupled to said first injector means, a carrier gas duct associated with said spray gun coupled to a second injector means for mixing spray powder with carrier gas fed to said duct, a carrier gas-powder mixing duct located forward of said second injector means, spray powder feeding means coupled to said torch body and communicating in powder-feeding relationship with said carrier gas duct and said second ejector means, and means forward of said first and second injector means for coupling said carrier gas-powder mixing duct and said fuel gas-oxygen mixing duct to said torch head.
Claim 2
Dependent Claim
160 words
A safety double injector spray device for applying a spray coating to a substrate comprising, a torch body having a torch head with a nozzle at the end thereof, an oxygen duct and a fuel gas duct associated with said spray device and coupled to a first injector means for mixing oxygen and fuel gas therein, a fuel gas-oxygen mixing duct located forward of and coupled to said first injector means, a carrier gas duct associated with said spray gun coupled to a second injector means for mixing spray powder with carrier gas fed to said duct, a carrier gas-powder mixing duct located forward of said second injector means, spray powder feeding means coupled to said torch body and communicating in powder-feeding relationship with said carrier gas duct and said second ejector means, and means forward of said first and second injector means for coupling said carrier gas-powder mixing duct and said fuel gas-oxygen mixing duct to said torch head.
Claim 3
Dependent Claim
41 words
The spray device of claim 1, wherein said carrier gas duct includes a branch duct line coupling said oxygen duct from before said first injector to said carrier gas duct, said oxygen duct providing carrier gas for said carrier gas duct.
Claim 4
Dependent Claim
24 words
The spray device of claim 2, wherein said branch line from said oxygen duct to said carrier gas duct has an adjustable valve therein.
Claim 5
Dependent Claim
48 words
The spray device of claim 3, wherein said branch line has a gas leak rate means associated therewith to provide an idle flow of oxygen at a predetermined leak rate through said carrier gas duct, even when the valve of said branch line is in the closed position.
Claim 6
Dependent Claim
57 words
The spray device of claim 4, wherein said valve in the branch line comprises a valve stem and a valve head and wherein said gas leak rate means comprises fine bores or grooves in the valve head of said branch line valve adapted to provide a predetermined leak rate with the valve head in the closed position.
Claim 7
Dependent Claim
48 words
The spray device of claim 4, wherein said gas leak rate means is a by-pass leak rate duct by-passing said branch line valve and coupled to said carrier gas duct to provide a continuous leak rate flow of oxygen to said carrier gas duct from said oxygen duct.
Claim 8
Dependent Claim
51 words
The spray device of claim 1, wherein said second injector means for mixing spray powder and carrier gas has a valve metering device cooperatively associated therewith for adjusting the amount of spray powder fed to said second injector means from said spray powder feed means for passage to said spray nozzle.
Claim 9
Dependent Claim
48 words
The spray device of claim 7, wherein said valve metering device is a pin coaxially and longitudinally movable into the opening of said powder injector means to vary the gap therebetween and hence the amount of powder fed to said powder injector means from said powder feeding means.
Claim 10
Dependent Claim
47 words
The spray device of claim 8, wherein said powder metering pin has a bore running coaxially therethrough with at least one cross channel orifice in the wall thereof near an end opposite said powder injector means, said at least one orifice communicating with said carrier gas duct.
Claim 11
Dependent Claim
37 words
The spray device of claim 9 wherein said pin passes through a gasket in sliding engagement therewith located at the forward end of said pin to inhibit powder from flowing rearward of said pin and cause clogging.
Claim 12
Dependent Claim
70 words
The spray device of claim 1, wherein the fuel gas-oxygen duct following the first injector means merges with the carrier gas-powder duct following the second injector means prior to entering the torch head, the region at which the ducts merge together defining a third injector for mixing said carrier gas-powder flow with said fuel gas-oxygen flow prior to injecting the total mixture into the torch head and the nozzle thereof.
Claim 13
Dependent Claim
48 words
The spray device of claim 1, wherein said carrier gas-powder duct and said fuel gas-oxygen mixing duct are each coupled via means to said torch head, whereby the mixing of the carrier gas-powder flow and the fuel gas-oxygen flow is effected at the nozzle of said torch head.
Claim 14
Dependent Claim
37 words
The spray device of claim 1, wherein the spray powder feeding means includes a powder container coupled to the torch body via a mounting on said torch body, said mounting having a powder feed channel passing therethrough.
Claim 15
Dependent Claim
72 words
The spray device of claim 13, wherein the mounting for said powder container means is a stub shaft projecting upwardly from said torch body with said powder container rotatably mounted via coupling means to said stub shaft, said stub having a feed channel passing therethrough in gravity-assisted communication with said powder container, said feed channel entering the torch body and communicating with the carrier gas duct in back of said second injector.
Claim 16
Dependent Claim
73 words
The spray device of claim 14, wherein said powder container is mounted via said coupling means axially offset at an angle relative to said stub shaft, whereby said container can be rotated in various axially offset positions depending upon the working positions of said spray device relative to a substrate being sprayed, said axially offset position of said powder container providing gravity assisted feed of powder from the container to said feed channel.
Claim 17
Dependent Claim
29 words
The spray device of claim 15, wherein the powder container coupling is provided with means for closing off the powder feed from said powder container to said feed channel.
Claim 18
Dependent Claim
25 words
The spray device of claim 1, wherein the carrier gas-powder mixture duct is disposed in a straight line from said second injector to said nozzle.
Claim 19
Dependent Claim
23 words
The spray device of claim 17, wherein the carrier gas-powder mixture duct is characterized by a replaceable liner of a wear resistant material.
Claim 20
Dependent Claim
16 words
The spray device of claim 1, characterized by valve means for cutting off all gas feeds.
Claim 21
Dependent Claim
35 words
The spray device of claim 1, wherein the torch head of said torch body has an annular cooling chamber for receiving gas from the carrier gas duct for effectively cooling said torch head during use.
Claim 22
Dependent Claim
25 words
The spray device of claim 20, wherein said annular cooling chamber is formed of a wear-protective casing supported by radial spacers in said torch head.
References Cited (Backward Citations)
GB416452A
Cited
GB425817A
Cited
US2072845A
Cited
US2108998A
Cited
FR46010E
Cited
GB707290A
Cited
US2786779A
Cited
US2804337A
Cited
US3190560A
Cited
US3226028A
Cited
GB1140511A
Cited
US3415449A
Cited
US3404838A
Cited
US3476320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |