Coating processes – Nonuniform coating – Mask or stencil utilized
Patent
1985-09-04
1987-03-24
Lawrence, Evan K.
Coating processes
Nonuniform coating
Mask or stencil utilized
427236, 427238, 427239, 427421, B05D 508, B05D 132, B05D 722, B05D 724
Patent
active
046524681
ABSTRACT:
A process and apparatus for high pressure impact coating of portions of workpieces such as the threaded openings in fasteners in avoidance of contaminating undesired portions of the workpieces with the coating material. A metered quantity of coating material is charged into a passageway and moved by low pressure air to a chamber ahead of an atomizing nozzle. High pressure air is introduced to the passageway and the coating material is fogged into a chamber defined by the workpiece and tooling. Proliferation and impingement of the cloud on the selected surfaces follows under vented conditions. A constriction in the vent line achieves the necessary delay and sets the system for accomplishing the coating. The machine structure facilitates use of the coating devices with a wide range of female threaded fasteners and achieves the process steps while providing for flushing the lines and drying the working structure.
REFERENCES:
patent: 3422795 (1969-01-01), Smith
patent: 3811408 (1974-05-01), Thompson
patent: 3896760 (1975-07-01), Duffy
patent: 3974306 (1976-08-01), Inamura et al.
patent: 4043295 (1977-08-01), Speck et al.
patent: 4060868 (1977-12-01), Axviq et al.
patent: 4327132 (1982-04-01), Shinno
Gould Kenneth E.
Hamilton Eugene A.
Lawrence Evan K.
Peterson American Corp.
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