US4139155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic spray gun with isolating paint conduit
Assignee: Nordson Corp
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Filing: 1977-05-25
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Granted: 1979-02-13
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Expires: 1997-05-25
Abstract
Abstract In a hand held electrostatic type spray coating gun a removable cartridge lengthens the paint supply conduit between the base of the grounded handle and the barrel so that the gun can be used to spray paints which have moderate electrical conductivities such as those containing metallic particles. The cartridge includes a Teflon tube in the form of an elongated spiral. Fluid connections at each end of the cartridge allow the cartridge to be easily removed and stored, and a straight conduit substituted for it when it is not needed, for example when the gun is to be used for nonconductive paints. The location of the cartridge facilitates removal, and combines with the gun to provide a well balanced device for hand held operation.
Inventors
- 👤 Donald R. Hastings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/16; B05B5/1608; B05B5/1616
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
193 words
In an electrostatic hand held liquid coating gun for moderately conductive paints including those paints using a polar type solvent, the gun having a barrel, at one end of which barrel paint is atomized and electrically charged, the other end of which barrel is supportably connected to a handle assembly having a distal base, and which extends at an angle from said barrel, the barrel further comprising a passage for the paint which will be atomized, an opening through the side of the barrel in fluid communication with said passage and adapted to be connected to a source of paint under pressure, the improvement which comprises: a dielectric conduit spiraled for a substantial portion of its length in non-encompassing relationship with said barrel, having a first end in hydraulically sealable fluid connection to the opening of said barrel and a second end adapted to be connected in spaced apart relation from said first end to a source of paint under pressure; and conductor means in electrical contact with any liquid in said conduit at a point proximate said second end of said conduit; said conductor means further being electrically connected to ground potential.
Claim 2
Dependent Claim
193 words
In an electrostatic hand held liquid coating gun for moderately conductive paints including those paints using a polar type solvent, the gun having a barrel, at one end of which barrel paint is atomized and electrically charged, the other end of which barrel is supportably connected to a handle assembly having a distal base, and which extends at an angle from said barrel, the barrel further comprising a passage for the paint which will be atomized, an opening through the side of the barrel in fluid communication with said passage and adapted to be connected to a source of paint under pressure, the improvement which comprises: a dielectric conduit spiraled for a substantial portion of its length in non-encompassing relationship with said barrel, having a first end in hydraulically sealable fluid connection to the opening of said barrel and a second end adapted to be connected in spaced apart relation from said first end to a source of paint under pressure; and conductor means in electrical contact with any liquid in said conduit at a point proximate said second end of said conduit; said conductor means further being electrically connected to ground potential.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein the conduit is impermeable to polar solvents.
Claim 4
Dependent Claim
25 words
The apparatus of claim 2 wherein the spiraled passage extends between the opening in said barrel and a point proximate the base of said handle.
Claim 5
Dependent Claim
53 words
The apparatus of claim 3 wherein said conductor means is a metallic member having an electrically uninsulated passage through it, one end of the passage being adapted to be connected to a source of paint under pressure, and the other end of said passage connected to said second end of said spiral conduit.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein the fluid connections at either end of the spiraled conduit are reusable, unfastenable mechanical connections.
Claim 7
Dependent Claim
54 words
The apparatus of claim 5 wherein the conductive means is a metallic member having an electrically uninsulated passage through it, one end of the passage being adapted to be connected to a source of paint under pressure and the other end of said passage being connected to said second end of said spiraled conduit.
Claim 8
Dependent Claim
102 words
A fluid conduit cartridge for use with a hand held electrostatic spray gun comprising: a member having a passage therethrough in the form of a spiral and having an inlet to said passage and an outlet from said passage in spaced apart relation from one end of the spiral to the other, said passage being impermeable to polar solvents, the inlet and outlet of said passage being sealably but removably connectable to separate fluid passages and adapted to be supported between the barrel and handle of an electrostatic spray coating gun; and means retaining said passage in a compact and spiraled form.
Claim 9
Dependent Claim
102 words
A fluid conduit cartridge for use with a hand held electrostatic spray gun comprising: a member having a passage therethrough in the form of a spiral and having an inlet to said passage and an outlet from said passage in spaced apart relation from one end of the spiral to the other, said passage being impermeable to polar solvents, the inlet and outlet of said passage being sealably but removably connectable to separate fluid passages and adapted to be supported between the barrel and handle of an electrostatic spray coating gun; and means retaining said passage in a compact and spiraled form.
Claim 10
Dependent Claim
13 words
The apparatus of claim 7 wherein said passage is formed from a tube.
Claim 11
Dependent Claim
129 words
A fluid conduit cartridge for use with a hand held electrostatic spray gun having a barrel and handle, comprising: a tube impermeable to polar solvents, forming a fluid passage spiraled for the greater portion of its length, each end of which tube passes through separate supports in spaced apart relationship with each other; means holding the spiraled passage and supports in a compact and unitary assembly; and hydraulic fittings at each end of the tube, one adapted to connect one end of the tube to a pressurized source of paint at a distal end of the handle of the spray gun, and the other adapted to connect the other end of the tube to a paint supply conduit opening in the side of the barrel of the spray gun.
Claim 12
Dependent Claim
129 words
A fluid conduit cartridge for use with a hand held electrostatic spray gun having a barrel and handle, comprising: a tube impermeable to polar solvents, forming a fluid passage spiraled for the greater portion of its length, each end of which tube passes through separate supports in spaced apart relationship with each other; means holding the spiraled passage and supports in a compact and unitary assembly; and hydraulic fittings at each end of the tube, one adapted to connect one end of the tube to a pressurized source of paint at a distal end of the handle of the spray gun, and the other adapted to connect the other end of the tube to a paint supply conduit opening in the side of the barrel of the spray gun.
Claim 13
Dependent Claim
14 words
The fluid conduit cartridge of claim 9 wherein the tube is made of polytetrafluoroethylene.
Claim 14
Dependent Claim
31 words
The fluid conduit cartridge of claim 10 wherein said tube is forty-eight inches long, has an inside diameter of three-sixteenths of an inch and an outside diameter of one quarter inch.
Claim 15
Dependent Claim
13 words
The fluid conduit cartridge of claim 11 wherein said supports are funnel shaped.
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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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |