Patent US3667674A successfully refreshed from Google Patents.
US3667674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic powder coating apparatus
Assignee: Graco Inc
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Filing: 1971-02-16
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Granted: 1972-06-06
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Expires: 1991-02-16
Abstract
Abstract An electrostatic powder coating apparatus for coating the surfaces of articles with pulverulent materials having a quick and efficient material change feature such that said apparatus is adapted for selectively spraying materials having different characteristics wherein the change from one material to another can be accomplished without extensive purging of the system, said apparatus including a spray gun, a powder supply means adapted to be removably connected to the inlet of said spray gun, and a control means adapted to be connected to a switching means on said gun for controlling the supply of pulverulent materials to said gun.
Inventors
- 👤 Ronald F Parsons
- 👤 Richard M Sherman
- 👤 Robert M Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/14; B05B7/1404; B05B7/1477; B05B12/00; B05B12/14; B05B5/00; B05B5/16; B05B5/1683
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
169 words
An electrostatic powder coating apparatus for selectively electrostatically coating the surfaces of articles with pulverulent materials having a desired particular characteristic comprising: an electrostatic powder coating spray gun having a gun body containing a passage, said passage having an inlet for receiving pulverulent materials and a discharge for discharging said pulverulent materials toward the article to be coated, said spray gun further having a powder supply connecting means for connecting a powder supply conduit with the inlet of said passage, a switch means including a second connecting means for the connection of a control wire, a powder supply conduit adapted for removable connection to said powder supply connecting means and adapted to supply pulverulent material having a particular desired characteristic to the inlet of said passage, and a control means for controlling the supply of said pulverulent material to the inlet of said passage including a control wire whereby said switch means controls the supply of pulverulent materials having the desired particular characteristic to the inlet of said passage.
Claim 2
Dependent Claim
169 words
An electrostatic powder coating apparatus for selectively electrostatically coating the surfaces of articles with pulverulent materials having a desired particular characteristic comprising: an electrostatic powder coating spray gun having a gun body containing a passage, said passage having an inlet for receiving pulverulent materials and a discharge for discharging said pulverulent materials toward the article to be coated, said spray gun further having a powder supply connecting means for connecting a powder supply conduit with the inlet of said passage, a switch means including a second connecting means for the connection of a control wire, a powder supply conduit adapted for removable connection to said powder supply connecting means and adapted to supply pulverulent material having a particular desired characteristic to the inlet of said passage, and a control means for controlling the supply of said pulverulent material to the inlet of said passage including a control wire whereby said switch means controls the supply of pulverulent materials having the desired particular characteristic to the inlet of said passage.
Claim 3
Dependent Claim
15 words
The electrostatic powder coating apparatus of claim 1 wherein said passage is a longitudinal passage.
Claim 4
Dependent Claim
64 words
The electrostatic powder coating apparatus of claim 1 having a plurality of powder supply units each having a powder supply conduit adapted for removable connection to said powder supply connecting means and adapted to supply pulverulent material having a particular characteristic to said passage, each of said powder supply units also having an air supply connection means for selective connection with an air supply.
Claim 5
Dependent Claim
26 words
The electrostatic powder coating apparatus of claim 2 wherein said supply conduit includes a relatively rigid tube portion adapted to be disposed within said longitudinal passage.
Claim 6
Dependent Claim
48 words
The electrostatic powder coating apparatus of claim 3 wherein said supply conduit includes a rigid tube portion adapted to be inserted into the inlet of said longitudinal passage and extend through said longitudinal passage to a point immediately to the rear of said elongated charging and deflecting means.
Claim 7
Dependent Claim
31 words
The electrostatic powder coating apparatus of claim 1 wherein said switch means includes a trigger pivotally secured to said spray gun and wherein said second connecting means includes a male jack.
Claim 8
Dependent Claim
25 words
The electrostatic powder coating apparatus of claim 6 having a rigid sleeve means surrounding said male jack for preventing undesired contact with said male jack.
Claim 9
Dependent Claim
27 words
The electrostatic powder coating apparatus of claim 1 wherein said switch means is an electrical switch means and wherein said control wire is an electrical control wire.
Claim 10
Dependent Claim
79 words
The electrostatic powder coating apparatus of claim 1 having a plurality of powder supply units each having a powder supply conduit adapted for removable connection to said powder supply connecting means and adapted to supply pulverulent material having a particular desired characteristic to said passage, each of said pOwder supply units also having a control means for controlling the supply of pulverulent material to said passage including a control wire adapted for removable connection to said second connecting means.
Claim 11
Dependent Claim
28 words
The electrostatic powder coating apparatus of claim 9 wherein each of said powder supply conduits includes a relatively rigid tube portion adapted to be disposed within said passage.
Claim 12
Dependent Claim
27 words
The electrostatic powder coating system of claim 9 wherein said switch means is an electrical switch means and wherein said control wire is an electrical control wire.
Claim 13
Dependent Claim
50 words
The electrostatic powder coating apparatus of claim 9 having means for connecting the supply conduit and control means of each supply unit such that when one of said supply conduits is connected to said powder supply connecting means, its respective control wire will be connected to said second connecting means.
Claim 14
Dependent Claim
48 words
The electrostatic powder coating apparatus of claim 12 wherein each of said powder supply conduits includes a relatively rigid tube portion adapted to be disposed within said passage and wherein said switch means is an electrical switch means and wherein said control wire is an electrical control wire.
Claim 15
Dependent Claim
25 words
The electrostatic powder coating apparatus of claim 13 having a means including a threaded fixture for rigidly securing said powder supply conduit to said gun.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |