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US 3,942,721 AGranted
Fluidized powder feed system for rotary distributor of electrostatic coating apparatus
AssigneeRobert Bosch GmbH
InventorsHermann Wirth, Lothar Muller
Life of this patent
Estimating the term…
Abstract
Powder to be used for coating articles electrostatically is maintained in a fluidized condition in the supply container and in conveyor ducts all the way to a discharge over the inner wall of an annular channel onto the rotating disk of an electrostatic coating machine.
Claims6
Powder feed system for the rotary spray disk of an electrostatic coating apparatus for coating with said powder work pieces caused to pass by the neighborhood of the edge of the disk while subjected to an electric potential relative to said disk, comprising:
- an annular channel (10) located above the rotary disk and co-axial thereto and provided with overflow crenelations on its inner wall (17);
- said inner wall defining an axial passageway, open at its bottom, whereby to feed said rotary spray disk;
- means for pouring a stream of powder into said annular channel, and
- means (14, 15) for maintaining the coating powder in said annular channel in a fluidized condition whereby to overflow at said crenelations to feed said disk.
1 more element
Dependencies are inferred from the claim text.