Method and apparatus for delivering and applying an electrically conductive paint
First Claim
1. A method of applying an electrically conductive paint to a substrate located in a paint spray booth with an electrically charged paint applicator located within said paint spray booth from a color changer at ground potential, said method comprising the following steps:
- delivering electrically conductive paint through a first delivery line from said color changer at ground potential to a paint cannister located outside said paint spray booth having a reciprocable piston and retracting said piston to receive a predetermined volume of electrically conductive paint in said paint cannister;
then electrically isolating said color changer from said paint cannister and said electrically conductive paint in said paint cannister; and
then delivering said electrically conductive paint through a second delivery line from said paint cannister located outside said paint spray booth to said electrically charged paint applicator located within said paint spray booth by extending said piston to drive a predetermined volume of electrically conductive paint from said paint cannister to said electrically charged paint applicator, thereby electrically charging said electrically conductive paint and applying said electrically conductive paint to said substrate with said color changer electrically isolated from said paint cannister and said electrically conductive paint.
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Accused Products
Abstract
The method of applying an electrically conductive paint of this invention includes delivering paint from a color changer (30) at ground potential, then electrically isolating the color changer (30) from the paint in a delivery line (100), and the delivering the paint through a first delivery line (74) to an electrically charged paint applicator (27). In the disclosed embodiment, paint is delivered from the color changer (30) to a paint cannister (34) having a piston (56) and the piston (56) is then extended to drive paint through the delivery tube (74) to the applicator (27) while the paint cannister (34) is electrically isolated from the color changer (30).
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Citations
12 Claims
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1. A method of applying an electrically conductive paint to a substrate located in a paint spray booth with an electrically charged paint applicator located within said paint spray booth from a color changer at ground potential, said method comprising the following steps:
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delivering electrically conductive paint through a first delivery line from said color changer at ground potential to a paint cannister located outside said paint spray booth having a reciprocable piston and retracting said piston to receive a predetermined volume of electrically conductive paint in said paint cannister;
then electrically isolating said color changer from said paint cannister and said electrically conductive paint in said paint cannister; and
then delivering said electrically conductive paint through a second delivery line from said paint cannister located outside said paint spray booth to said electrically charged paint applicator located within said paint spray booth by extending said piston to drive a predetermined volume of electrically conductive paint from said paint cannister to said electrically charged paint applicator, thereby electrically charging said electrically conductive paint and applying said electrically conductive paint to said substrate with said color changer electrically isolated from said paint cannister and said electrically conductive paint. - View Dependent Claims (2, 3, 4, 5)
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6. A method of applying an electrically conductive paint to a substrate located in a paint spray booth with an electrically charged applicator located within said paint spray booth from a color changer at ground potential through a delivery line, said method comprising the following steps:
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delivering said electrically conductive paint under pressure through a first line from said color changer at ground potential to a paint cannister;
then electrically isolating said color changer from said paint cannister and said electrically conductive paint in said paint cannister by driving a pig with nonconductive fluid pressure through said first line from said color changer to said paint cannister;
then delivering said electrically conductive paint through a second delivery line from said paint cannister to said electrically charged paint applicator, electrically charging said electrically conductive paint and applying said charged electrically conductive paint to said substrate. - View Dependent Claims (7)
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8. An apparatus for applying an electrically conductive paint to a substrate, comprising:
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a paint spray booth;
an electrically charged paint applicator within said paint spray booth;
a color changer located outside said paint spray booth at ground potential;
at least one paint cannister having a reciprocable piston;
a first delivery line from said paint cannister to said electrically charged paint applicator adapted to deliver electrically conductive paint to said electrically charged paint applicator; and
a second delivery line between said paint cannister and said color changer having a pig movable therein between said color changer and said paint cannister to deliver paint in said second delivery line to said paint cannister and electrically isolate said color changer from said paint cannister and said electrically conductive paint when paint is delivered from said paint cannister to said electrically charged paint applicator, charging said electrically conductive paint. - View Dependent Claims (9, 10, 11, 12)
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Specification