John L Davidson

US Patent:

44002513, Aug 23, 1983

Filed:

Jun 5, 1981

Appl. No.:

6/270612

Inventors:

Robert E. Heffner - Lower Burrell PA
John J. Davidson - New Kensington PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

C25D 1304
C25D 1314

US Classification:

204181R

Abstract:

A method and apparatus are provided for electrocoating the interior and exterior of a metal container using a dual flow system. The interior and exterior surfaces of the metal container may be coated with the same or different coating weights. An electrically conductive probe, including a nozzle, is inserted into a metal container and an electrically conductive housing is enclosed around the container to seal the container therein. Two separate passageways are provided such that one passageway supplies coating material about the container between the container exterior and the outer housing and a second passageway is formed by the hollow probe and the interior of the container. Electrocoating material is caused to flow into each of the passageways. As flowing electrocoating material floods the container interior and exterior in separate transient baths, an electrical potential is impressed between the container and the probe-nozzle to electrocoat the interior of the container, and between the container and the outer housing to electrocoat the exterior of the container. The interior and exterior of the container can be coated simultaneously.

US Patent:

46768815, Jun 30, 1987

Filed:

Jan 13, 1986

Appl. No.:

6/817870

Inventors:

John J. Davidson - New Kensington PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

C25D 1700
C25D 1312
C25D 1300
C25B 900

US Classification:

204212

Abstract:

An electrocoating cell preferably for use in a rotary turret machine for electrocoating a container or the like in an upright orientation, wherein all requisite coating medium inlet connections and electrical connections to the cell, as well as both the inner and outer electrodes, are carried by a single vertically movable cell assembly, preferably the upper part of the cell, which cooperates with a relatively vertically stationary cell base that carries the upright container.

US Patent:

45444757, Oct 1, 1985

Filed:

Jun 27, 1984

Appl. No.:

6/625178

Inventors:

Robert E. Heffner - Lower Burrell PA
John J. Davidson - New Kensington PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

C25D 1314

US Classification:

204300EC

Abstract:

An electrocoating apparatus for electrocoating a plurality of metal containers through coordinated cycling of a plurality of electrocoating cells, preferably in unison, through the requisite electrocoating operating cycle and including transfer means for moving the metal container to and from the respective electrocoating cells on a pass line through the apparatus.

US Patent:

42105072, Jul 1, 1980

Filed:

Sep 18, 1978

Appl. No.:

5/943154

Inventors:

John J. Davidson - New Kensington PA
David A. Smith - Murrysville PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

B05B 502
B05C 704
C25D 1314
C25D 1712

US Classification:

204181R

Abstract:

A hollow electrically conductive probe and method are provided for electrocoating a metal container. The probe is insertable into the container, which is preferably inverted, and electrocoating material is flowed through the probe to fill the container with a transient bath of electrocoating material. The probe includes a means for retarding the flow of the electrocoating material from the container interior by establishing an opposing flow of electrocoating material to increase the flow turbulence without creating discontinuities of flow in order to facilitate the electrocoating of corners and recesses near the container bottom. Preferably, peripheral openings about the probe body direct flowing electrocoating material toward the container bottom.