US4543274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder spray gun and powder spray method
Assignee: Nordson Corp
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Filing: 1984-06-21
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Granted: 1985-09-24
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Expires: 2004-06-21
Abstract
Abstract A powder spray gun and method of spraying powder are disclosed wherein an air flow amplifier is contained within the gun and is operable to draw ambient air into the gun and to impact air entrained powder passing through the gun with a high velocity stream of compressed air so as to accelerate the velocity of powder emitted from the gun.
Inventors
- 👤 Douglas C. Mulder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:05
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0609; B; B05; B05B; B05B7/00; B05B7/14; B05B7/1481; B05B7/1486; Y; Y10; Y10S; Y10S239/00; Y10S239/03
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
157 words
A method of spraying solid particulate powder from a powder spray gun, which gun includes a barrel and a nozzle at the discharge end of said barrel, which barrel has a central axis, which method comprises transporting said solid particulate powder to said barrel of said gun while entrained in an air stream, passing said air entrained powder through an air flow amplifier wherein said air entrained powder is impacted by a high velocity air stream directed generally parallel to the axis of said barrel and drawing ambient air into said air flow amplifier upstream of the point of impaction of said high velocity air stream with said air entrained powder material so as to increase the volume of air within which said powder material is entrained in the course of passage through said barrel, passage of said air entrained powder through said air flow amplifier being operable to increase the velocity of said solid particulate material.
Claim 2
Independent Claim
157 words
A method of spraying solid particulate powder from a powder spray gun, which gun includes a barrel and a nozzle at the discharge end of said barrel, which barrel has a central axis, which method comprises transporting said solid particulate powder to said barrel of said gun while entrained in an air stream, passing said air entrained powder through an air flow amplifier wherein said air entrained powder is impacted by a high velocity air stream directed generally parallel to the axis of said barrel and drawing ambient air into said air flow amplifier upstream of the point of impaction of said high velocity air stream with said air entrained powder material so as to increase the volume of air within which said powder material is entrained in the course of passage through said barrel, passage of said air entrained powder through said air flow amplifier being operable to increase the velocity of said solid particulate material.
Claim 3
Dependent Claim
31 words
The method of claim 1 which further comprises passing said air entrained powder over a diverging surface so as to increase the width of the pattern sprayed from said gun nozzle.
Claim 4
Independent Claim
183 words
The method of spraying solid particulate powder from a powder spray gun, which gun includes a barrel and a nozzle at the discharge end of said barrel, which barrel has a central axis, which method comprises transporting aaid solid particulate powder to said barrel of said gun while entrained in an air stream, passing said air entrained powder axially through an air flow amplifier having a central axis extending parallel to the axis of said barrel, supplying compressed air to said air flow amplifier, impacting said air entrained powder with a high velocity stream of said compressed air directed generally parallel to the axis of said amplifier and drawing ambient air into said air flow amplifier upstream of the point of impaction of said high velocity air stream with said air entrained powder material so as to increase the volume of air within which said powder material is entrained in the course of passage through said barrel, passage of said air entrained powder through said air flow amplifier being operable to increase the velocity of said solid particulate powder in an axial direction.
Claim 5
Independent Claim
183 words
The method of spraying solid particulate powder from a powder spray gun, which gun includes a barrel and a nozzle at the discharge end of said barrel, which barrel has a central axis, which method comprises transporting aaid solid particulate powder to said barrel of said gun while entrained in an air stream, passing said air entrained powder axially through an air flow amplifier having a central axis extending parallel to the axis of said barrel, supplying compressed air to said air flow amplifier, impacting said air entrained powder with a high velocity stream of said compressed air directed generally parallel to the axis of said amplifier and drawing ambient air into said air flow amplifier upstream of the point of impaction of said high velocity air stream with said air entrained powder material so as to increase the volume of air within which said powder material is entrained in the course of passage through said barrel, passage of said air entrained powder through said air flow amplifier being operable to increase the velocity of said solid particulate powder in an axial direction.
Claim 6
Dependent Claim
31 words
The method of claim 3 which further comprises passing said air entrained powder over a diverging surface so as to increase the width of the pattern sprayed from said gun nozzle.
Claim 7
Dependent Claim
33 words
The method of claim 4 which further comprises varying the pressure of said compressed air in said air flow amplifier so as to vary the width of the pattern sprayed from said gun.
Claim 8
Independent Claim
159 words
The method of varying the pattern of solid particulate powder sprayed from the nozzle of a powder spray gun, which method comprises supplying air entrained powder to the entrance throat of an air flow amplifier, supplying compressed air to said air flow amplifier, impacting said air entrained powder with a high velocity stream of said compressed air within said air flow amplifier, drawing ambient air into said air flow amplifier upstream of the point of impaction of said high velocity air stream with said air entrained powder material so as to increase the volume of air within which said powder material is entrained in the course of passage through said barrel, supplying said mixture of compressed air and air entrained powder from said air flow amplifier to said nozzle of said gun, and varying the pressure of said compressed air supplied to said air flow amplifier to vary the pattern of powder dispersed from said nozzle of said gun.
Claim 9
Independent Claim
159 words
The method of varying the pattern of solid particulate powder sprayed from the nozzle of a powder spray gun, which method comprises supplying air entrained powder to the entrance throat of an air flow amplifier, supplying compressed air to said air flow amplifier, impacting said air entrained powder with a high velocity stream of said compressed air within said air flow amplifier, drawing ambient air into said air flow amplifier upstream of the point of impaction of said high velocity air stream with said air entrained powder material so as to increase the volume of air within which said powder material is entrained in the course of passage through said barrel, supplying said mixture of compressed air and air entrained powder from said air flow amplifier to said nozzle of said gun, and varying the pressure of said compressed air supplied to said air flow amplifier to vary the pattern of powder dispersed from said nozzle of said gun.
Claim 10
Dependent Claim
143 words
A powder spray gun for spraying air entrained solid particulate powder, which gun comprises a tubular barrel having an inlet end and a discharge end, means for connecting said inlet end to a source of air entrained powder, a nozzle on the discharge end of said barrel, and air flow amplifier means connected to said barrel for impacting said air entrained powder with a high velocity air stream in the course of passage of said air entrained powder through said air flow amplifier means, said air flow amplifier means having an inlet end open to ambient air and to said source of air entrained powder such that said high velocity air stream is operable to create a vacuum at said inlet end of said air flow amplifier means and draw ambient air and said air entrained powder into said air flow amplifier means.
Claim 11
Dependent Claim
143 words
A powder spray gun for spraying air entrained solid particulate powder, which gun comprises a tubular barrel having an inlet end and a discharge end, means for connecting said inlet end to a source of air entrained powder, a nozzle on the discharge end of said barrel, and air flow amplifier means connected to said barrel for impacting said air entrained powder with a high velocity air stream in the course of passage of said air entrained powder through said air flow amplifier means, said air flow amplifier means having an inlet end open to ambient air and to said source of air entrained powder such that said high velocity air stream is operable to create a vacuum at said inlet end of said air flow amplifier means and draw ambient air and said air entrained powder into said air flow amplifier means.
Claim 12
Dependent Claim
55 words
The powder spray gun of claim 7 which further includes a powder dispersing deflector adjacent the discharge end of said barrel, said deflector having a diverging surface over which the air entrained powder is passed in the course of being discharged from said gun so as to establish a wide dispersion pattern of said powder.
Claim 13
Dependent Claim
91 words
The powder spray gun of claim 7 wherein said air flow amplifier means comprises an amplifier nozzle having a central bore axially aligned with said barrel, said amplifier nozzle having an inlet connected to said source of air entrained powder and an outlet open to said barrel, an annular air chamber surrounding said amplifier nozzle, an air inlet into said annular air chamber, means for connecting said air inlet to a source of compressed air, and an annular orifice connecting said annular air chamber to said bore of said amplifier nozzle.
Claim 14
Dependent Claim
39 words
The powder spray gun of claim 9 wherein said air flow amplifier means has an annular lip surrounding said annular orifice, said lip being operable to deflect air emitted from said orifice toward said discharge end of said barrel.
Claim 15
Dependent Claim
112 words
A powder spray gun for spraying air entrained solid particulate powder, which gun comprises a tubular barrel having an inlet end and a discharge end, means for connecting said inlet end to a source of air entrained powder, a nozzle on the discharge end of said barrel, and air flow amplifier means connected to said barrel, said air flow amplifier means having an inlet and being operable to draw ambient air into said inlet of said air flow amplifier means and to impact said air entrained powder with a high velocity stream of compressed air downstream of said inlet in the course of passage of said air entrained powder through said gun.
Claim 16
Dependent Claim
112 words
A powder spray gun for spraying air entrained solid particulate powder, which gun comprises a tubular barrel having an inlet end and a discharge end, means for connecting said inlet end to a source of air entrained powder, a nozzle on the discharge end of said barrel, and air flow amplifier means connected to said barrel, said air flow amplifier means having an inlet and being operable to draw ambient air into said inlet of said air flow amplifier means and to impact said air entrained powder with a high velocity stream of compressed air downstream of said inlet in the course of passage of said air entrained powder through said gun.
Claim 17
Dependent Claim
58 words
The powder spray gun of claim 11 which further includes a powder dispersing deflector adjacent the discharge end of said barrel of said gun, said deflector having a diverging surface over which the air entrained powder is passed in the course of being discharged from said gun so as to establish a wide dispersion pattern of said powder.
Claim 18
Dependent Claim
49 words
The powder spray gun of claim 11 which further comprises means for supplying compressed air to said air flow amplifier, and means for varying the pressure of air supplied to said air flow amplifier so as to vary the pattern of powder sprayed from said nozzle of said gun.
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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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |