Vacuum Electric-Arc Furnace. Page: 4 of 7
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UNITED STATES PATENT OFFICE.
IIILLIARY ELDRIDGE, GEORGE HUDSON WRIGHT, AND DANIEL J. CLARK,
OF GALVESTON, TEXAS.
VACUUM ELECTRIC-ARC FURNACE.
SPECIFICATION forming part of Letters Patent No. 583,618, dated June 1, 1897.
Application filed February 24, 1896. Serial No. 580,439. (No model.)To cll wzcon it n ay concer :
Be it known that we, IIILLIAR Y ELDRIDGE,
GEORGE IUDSON WRIGHT, and DANIEL J.
CLARK, citizens of the United States, residing
5 at Galveston, in the county of Galveslon and
State of Texas, have invented a new and use-
ful Vacuum Electric-Arc Furnace, of which
the following is a specification.
This invention relates to a new and useful
ro vacuum electric-arc furnace; and it has for
its object to effect certain improvements in
furnaces of this character that are designed
for the fusion of metals, the reduction of ores
and the metallic oxids, and the manufacture
15 of various alloys, &c.
To this end the main and primary object of
the present invention is to provide an im-
proved electric furnace having means to posi-
tively insure the thorough fusion or reduc-
20 tion of the substances placed therein without
loss due to combustion or the oxidation of such
substances, while at the same time providing
an effective distribution of the heat and the
prevention of the loss of carbon by combus-
25 tion.
With these and many other objects in view,
which will readily appear as the nature of the
invention is better understood, the same con-
sists in the novel construction, combination,
30 and arrangement of parts hereinafter more
fully described, illustrated, and claimed.
In the drawings, Figure 1 is a vertical sec-
tional view of an electrical furnace con-
structed in accordance with this invention.
35 Fig. 2 is a cross-sectional view on the line 2 2
of Fig. 1. Fig. 3 is a similar view on the line
3 3 of Fig. 1. Fig. 4 is a plan view of the
clamp-ring for supporting the cylindrical hol-
low anode. Fig. 5 is a detail sectional view
40 on the line 5 5 of Fig. 1.
Referring to the accompanying drawings,
1 designates a supporting-base made of fire-
brick or other suitable material and provided
with a peripheral upwardly-disposed circular
45 wall 2, which incloses a space within which
rests the lower open end of the cylindrical
furnace-casing 3. The cylindrical furnace-
casing 3 is made of fire-brick or other re-
fractory material and rests at its lower end
50 directly on the upper side of the base 1 with-
in the wall 2 thereof, and the said casing 3 is
exteriorly encircled by a metallic or othersuitable exterior jacket or shell 4, which serves
as a protective covering for the furnace.
The space between the lower end of the 55
casing 3 and the wall 2 of the base 1 is de-
signed to be filled with sand or other suitable
filling to provide a seal for the lower end of
the furnace-casing in order to make such cas-
ing perfectly air-tight at that point, as will 60o
be readily understood, and the lower open
end of the said furnace-casing forms a receiv-
ing-pit 5 for the fused substances, and with
which pit communicates a door-opening 6,
formed in one side of the furnace-casing at 65
the extreme lower end thereof and adapted
to be covered and uncovered at the outer side
of the furnace-casing by a suitable door 7,
which, when removed from the casing, allows
access through the door-opening 6 to the re- 70
ceiving-pit 5, so that the substances which
may have been dumped in such pit can be
readily removed.
The cylindrical furnace-casing 3 is disposed
in an upright position and is provided in its 75
top edge with an annular recess or pocket 8
and at a point intermediate of its upper and
lower ends with an interior supporting-shoul-
der 9, which forms a rigid support for the in-
ner cylindrical cathode 10. The inner cylin- 80o
drical cathode 10 snugly registers within the
interior of the cylindrical casing 3 and is
preferably made of carbon; but said cathode
may be made of any other suitable conduct-
ing material that is refractory to heat in a 85
vacuum. The cylindrical cathode 10 practi-
cally forms the fusing-pot of the furnace and
is provided near its lower edge with an ex-
teriorly-formed rest-shoulder 11, resting di-
rectly on the interior shoulder 9 of the fur- 90
nace-casing, whereby the said cathode is
firmly and removably supported in place, and
the said cathode has detachably connected to
one side thereof the inner threaded end 12 of
the conducting-rod 13, extended through the 95
wall of the furnace-casing 3 and through an
insulator-bushing 14, fitted in the metallic
jacket or shell 4 of the casing. The said con-
ducting-rod 13, which has a detachable con-
nection at its inner end with the cathode, is oo
provided at its outer end, outside of the fur-
nace-easing, with a binding-post 15, in which
is secured one terminal of the branch con-
ductor a, and it will of course be understood
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Eldridge, Hilliary; Wright, George Hudson & Clark, Daniel J. Vacuum Electric-Arc Furnace., patent, June 1, 1897; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth174626/m1/4/?q=%22lighting%22: accessed April 30, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.