Metallurgical apparatus – Having means for contacting a solid metalliferous material... – By immersing an article to be treated in bath of molten...
Patent
1978-12-06
1980-09-16
Rutledge, L. Dewayne
Metallurgical apparatus
Having means for contacting a solid metalliferous material...
By immersing an article to be treated in bath of molten...
266128, 266130, C21D 146
Patent
active
042225540
ABSTRACT:
In the art electric heat treat furnaces have a frame and an open top housing of refractory brick therein including a plurality of inner walls defining a chamber throughout its height adapted to receive a molten bath such as a salt bath into which metal pieces are suspended for heat treatment. The chamber has a top entrant passage of rectangular shape. Electrodes extend transversely through the housing adjacent the chamber for the passage of current through the bath between the electrodes to maintain the bath at a predetermined heat treat temperature. A transformer having primary and secondary pads includes electric connectors between the pads and the electrodes. The improvement herein comprises a plurality of vertically spaced tiers of vertically spaced electrodes arranged along the height of the chamber. At least one and, in some cases, a pair of spaced inner walls of the housing are laterally displaced outwardly of the entrant passage to provide a heat treat chamber which is laterally enlarged adjacent such displaced inner wall thereby spacing the electrodes laterally outward of the entrant passage and outward of the chamber. Thus, the workpieces to be treated may extend to the bottom of the chamber, the tiers of electrodes maintaining a substantially uniform temperature of the bath throughout the depth of the bath. The entrant passage serves to space the workpieces inwardly of the electrodes so as not to obstruct the current flow between such electrodes. A modification includes additional vertically spaced tiers of vertically spaced electrodes laterally spaced from the corresponding first mentioned tiers of electrodes.
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Rutledge L. Dewayne
Sheehan John P.
Upton Industries, Inc.
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