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Патент USA US3026455

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March 20, 1962
c, M. SLQCOMBE ETAL
3,026,444
ELECTRODE CLAMPS
Filed Sept. 22,. 1959
2 Sheets-Sheet 1
INVEN TORS
CYPRiAN
M. SLOCOMBE
EENN T_ LOVE/m
M 96% Add/5
March 20, 1962
'
Filed Sept. 22, 1959
c. M. SLOCOMBE ETAL
3,026,444
ELECTRODE CLAMPS
2 Sheets-Sheet 2
INVEN TORS
CYPRI'AN M. SLOCOMBE
BENN T./_01(E_RN
g
Unite States "5 atent ‘
1
1C6
1
3,s2e,4?44
Patented Mar. 20, 1962
2
3,026,444
Cyprian M. Slocombe, Stocksbridge, near'Shet?eld, and
ELECTRODE CLAMPS
Benn T. Lovern, Erdington, Birmingham, England, as
signors to Samuel Fox 8: Company Limited, Stocks
bridge, near Sheffield, England, and AEI-Birlec Lim
ited, Erdington, Birmingham, England
'
,.
Filed Sept. 22, 1959, Ser. No. 841,609
9 Claims. (Cl. 314-101)
respectively through the slots 10, the lower free ends of
the said branches being journalled about one and the
same pivot pin 13 which extends through and is remov
vable from the base of the holder. By journalling the
branches about the common removable pin, the initial
assembly of the strap and lever upon the holder, and
subsequent dismantling, if and when necessary or de
sirable, of the said strap and lever, is facilitated.
The clamp is carried upon one end of a horizontal rod
This invention has reference to electrode clamps and
is concerned, more particularly, with electrode clamps
10 14 which projects above, and is adapted to be raised and
lowered relatively to, the furnace into the working cham
ber of which an electrode 14, gripped between the shoe
of electric arc furnaces.
and strap of the clamp, depends, the base of the holder
The principle object of the present invention is to re
being bolted to a ?ange around a crosshead 15 ?xed‘
duce the costs of manufacture of the clamps and to mini 15 upon and electrically insulated from the said rod end.
mise their liability to fail, by reducing the number of
The platform supported shoe has a recess 16 in its
cast copper, current conducting components which are
face which sea-ts upon the internal surface of the holder
are not only expensive to manufacture but are also di?i
base and a lip 17 provided on the upper end of the shoe,
cult to produce free of faults.
.
projects over and beyond the upper edge of the said base
A further object of the invention is to provide an im 20 where it is bolted and electrically connected to plates 18
proved electrode clamp of which the component parts are
on two bus tubes 19 mounted above and parallel to the
readily accessible, thereby facilitating assembly andv also,
when desired, the dismantling of the clamp.
clamp-carrying rod and crosshead, the said tubes serving,
?rst, as current conductors to the shoe and, secondly, as
7' Still another object of the invention, when applied to
ducts for a ?uid coolant.
a'clamp intended to be incorporated in an arc furnace, 25
The face of the shoe remote from the holder base is
is to enable a heat shield to be assembled thereto in a
concave in transverse section and is ribbed transversely
simple and speedy manner which minimises buckling of
I so that it is adapted to ‘seat part way round, and to effect a
the shield under the action of heat generated in and
?rm hold on, the electrode.
radiated from the furnace.
A sinuous or like duct 20 cast into the shoe, is incor
The above and other objects ‘of the invention will be 30 porated in a coolant circulating system by a pipe 21
apparent from the following description when read in
conjunction with the accompanying drawings which show,
by way of example, one mode of carrying the invention
connected into and between one end of the duct and the
bore of one of the bus tubes, at second pipe 22 connected
into and between the other end of the duct and the in
into effect.
terior of the crosshead, and a third pipe 23 connected into
In the said drawings:
35 and between the interior of the crosshead and the bore
FIGURE 1 is an elevation and FIGURE 2 is a plan of
of the other bus tube.
a clamp primarily intended for holding an electrode of
The concave face of the semi-circular closed end and
an electric arc furnace, and
of the U-shaped strap is opposed to the concave shoe face
FIGURE 3 is a section along the line III--III, of
FIGURE 2.
.
and, when the electrode is gripped within the clamp, is
40 concentric to the said shoe face and to enhance the ability
The clamp shown in the drawing comprises a current
of the closed strap end to grip the electrode, upwardly
conducting shoe 1 which is accommodated within a
and downwardly extending electrode-contacting ?anges
holder 2, and a strap 3 which is mounted on the holder
25 are provided on its edges so as to increase the effective
and is slidable relatively to the said holder towards and
width of the said end. A rib 26 formed on and extending
away from the shoe. The shoe consists of a copper cast 45 around the external face of the closed end and along the
ing whereas the holder and strap are fabricated ‘from a
sides of the strap, enhances the strength of the strap.
ferrous or any other convenient metal which, compared
Hooks 27 are provided on the strap and holder to serve
with copper, is inexpensive and is easy to fabricate free
as anchorages for the eyed ends of suspension wires 28 of
of faults.
.
an apertured heat shield 29 through which the gripped
The holder is of U-shape in transverse section and com 50
electrode passes and which protects the holder, shoe and
prises a base 4 from the opposite edges of which two
strap from heat radiated from the furnace. The engage
side cheeks 5 project in the same direction; the lower end
ment of the eyed ends of the wires with the hooks enables
of the said base is provided with a shelf or platform 6
the shield to expand and contract without restriction so
which extends across the lower edges of the roots of the
said cheeks and serves as a support for the shoe. Each 55 that buckling of the shield is minimised.
By removing the pivot pin of the forked lever from the
cheek is formed on its external surface and between its
base of the holder, withdrawal of the branches of the
upper and lower edges, with two laterally-projecting,
lever from the slots in the sides of the strap is permitted,
parallel lugs 7 which reach from the cheek edge remote
whereupon the said sides may be withdrawn from be
from the holder base, part way across the cheek.
tween the pairs of lugs on the holder cheeks and, after
The strap is of U-shape, is of a depth considerably less
unbolting the shoe from the bus tubes, the said shoe may
than the depth of the shoe, its closed and semi-circular
end 8 is located beyond and bridges the opening between
be removed from the holder. vFurther, the holder itself
may be dismantled by removing the bolts whereby it is
the side cheeks 5 and its arms 9 embrace the said cheeks,
are disposed between and ‘are slidable longitudinally of
assembled to the ?anged end of the crosshead. Hence,
the lugs on the respective cheeks, their free ends pro 65 should any one of the clamp components develop a fault,
jecting beyond the said lugs towards the holder base, and
it may be dismantled and replaced quickly and easily.
each of the said free end-s has a longitudinal slot 10 which
To reciprocate the strap relatively to the shoe, the
opens to the upper and lower edges of the corresponding
upper end of the forked lever may be connected by a
arm.
removable pin (not shown) to the piston rod of a hy
The strap is reciprocable relatively to the holder by 70 draulic or like cylinder (also not shown) mounted upon
an operating lever 11 of which the branches 12 of the
and externally of the furnace, the said rod being loaded
lower forked end embrace the holder base and extend
by a spring tending to displace it longitudinally in the
s,oee,444.
3
direction which'causes the operating lever to urge the
strap towards the shoe so as to maintain the gripping
e?ect cf the shoe and strap on the electrode; if and when
~ it is desired to release‘ the electrode for any reason, ?uid
4;»
shoe so that an electrode" extending through the clamp is
gripped between the shoe and the base of the strap.
5. An electrode clamp comprising a U-shaped holder
having a base and side cheeks, a hollow crosshead upon
which the said base is detachably assembled, a pair of
is admitted ‘to the said cylinder to displace the piston
bus tubes, a currentc‘onducting shoe accommodated be
against the action of‘ the spring.
tween the cheeks and supported upon the base of the
it is to be understood that the clamp vdescribed above
said holder and having a duct extending therethroughr
and shown in the drawings is only a typical application
pipes connecting the interiors of the crosshead and bus
of the invention and that various modi?cations and alter
ations may be made in the clamp within the scope of. the 10 tubes to the opposite ends of said duct topr‘ovide a path
for a circulating ?uid coolant, a U-shaped strap having
following claims without departing ‘from the spirit of the
a base and sides mounted‘ on and externally of the holder
invention. ‘Therefore it is to be further understood that
with its base spanning and its sides embracing and slida
the invention is not to be limited to the speci?c details
bly engaging the said cheeks, a forked lever having arms’ '
' described and shown.
15 which embrace and are pivoted upon the holder base and
We claim:
,
.
g
respectively engage the said strap sides, and means act
1. An electrode clamp comprising a U-shaped holder
ing on the lever for turning the said arms about their
having a‘ base and side cheeks, a current conducting shoe
parts in the direction which moves the strap base towards
accommodated within, and supported upon the base of,
the shoe so as to grip an electrode extending through the
the said holder, a U-shaped strap having a base and sides,
‘
of which the base spans and the sides embrace and slid 20 clamp between the said strap base and shoe. ‘ ,
6. An electrode ‘clamp comprising a U-shaped holder
ably engage the said cheeks, a forked lever having arms
having a base and side cheeks and a platform which
which embrace and are pivoted upon the base of the
projects from one'end of said base between the said
holder and engage the sides of the strap, and means for
cheeks, a current conducting shoe accommodated with
swinging the lever about the arm pivots to slide the strap
the holder and supported upon the said platform the
25 in
surface of the shoe adjacent the holder‘ base being recessed
electrode, which extends through the clamp, between the
and its opposite surface being concave in transverse sec- '
,shoe and the base of the strap.
tion, a strap having a curved‘ base which spans said “
2. An electrode clamp comprising a U-shaped holder
cheeks and of which the current surface faces said con;
having a base and side cheeks, thesaid base being pro
vided with a platform which is located ‘between the cheeks 30 cave shoe surface, and sides which embrace and slidably
engage said cheeks, said sides reaching to the holder base
and each of said cheeks having a pair of lugs on its ex
and having longitudinal slots therein, and a forked lever
ternal surface, a current conducting shoe supported upon
relatively to the holder towards the shoe so as to' grip an
the said platform, a strap having a base and sides, the
‘base of the strap spanning the cheeks and each of said
having arms which embrace and are pivoted upon the
holder base and extend respectively through said slots
sides being slidable between the lugs of a corresponding 35 so that by turning the lever about the pivots of said
arms in the direction which moves the strap base towards
the shoe, an electrode extending between the shoe and
the‘ base of the holder, a forked lever having arms which
strap base, is gripped in the clamp.
'
embrace and are pivoted upon said holder base and en»
7. An electrode clamp comprising a U-shaped holder
gage respectively with the said strap sides‘, and means
acting on said lever for turning the said arms about their 40 having a base and side checks, at current conducting shoe
mounted upon the said base between the said cheeks, a
pivots and sliding the strap relatively to the holder to
one of said cheeks and projecting beyond the lugs towards
wards the shoe so as to grip an ‘electrode, which extends
through the clamp, between the shoe and the base of the
strap.
3. An ‘electrode clamp comprising a U-shaped holder
having a base and side cheeks, a current conducting shoe
accommodated between the cheeks and supported upon
the base of said holder, a U-shaped strap having a base
and sides, the said strap base spanning and the said strap
sides embracing ‘and making respective sliding engage
ment with the said cheeks and each having a slot extend
ing therethrough, ‘a forked lever having arms which em
brace and are pivoted upon the base of the holder and
each of which extends through the slot in a corresponding
one of said strap sides, and means acting on said lever
pivot pin extending through the said base and projecting
beyond the said cheeks, a U-shaped strap having a, base
and sides mounted upon‘ the holder with its base spanning
and its‘v sides embracing and slidably engaging the said
cheeks, and a forked lever having arms which embrace
the holder base and are pivoted respectively upon the
projecting ends of said pin and which engage respectively
with the sides of the strap so that by turning the lever
upon the pin in the direction which slides the strap sides
upon the holder cheeks and moves the strap base to
wards the shoe, an electrode extending between the shoe
and strap base, is gripped within the clamp.
8. An electrode clamp comprising a U-shaped holder
electrode extending through the clamp, between the said
shoe and strap base.
4. An electrode clamp comprising a U~shaped holder
having a base and side cheeks, one end of the said base
being provided with a platform which is located between
the cheeks and each cheek being provided with a pair of
parallel lugs on its external surface, a current conducting
shoe supported within the holder upon said platform, a
U-shaped strap having a base and sides mounted upon
the holder‘ with its base spanning the said cheeks and its
having a base and side cheeks, a crosshead upon which
sliding engagement between and projecting beyond the
for turning the said arms about their pivots and sliding
the strap relatively to the holder in the direction which
moves the strap base towards the shoe so as to grip an
the said base is detachably assembled, a pair of current
conducting bus tubes, a current conducting shoe accom
modated within, and supported upon the base of, said
holder and having a lip which overhangs said base and
arms embracing the said cheeks and making respective
said pairs of lugs, each of said strap sides having a lon
gitudinal slot in its end projecting beyond the correspond
ing pair of lugs, a forked lever having arms which em
brace the holder base and extend respectively through the
is detachably assembled to said bus tubes, a U-shaped
slots in the strap sides, and a pivot pin extending through
strap having a base and sides, mounted on and externally
the holder base and the fork arms so that, ‘by turning the
of the holder with its base spanning and its sides embrac 70 lever' about the‘ said pin in the direction which slides the
ing the said cheeks, ‘a forked lever having arms which
strap sides between the lugs and moves the strap base
embrace and are pivoted upon the holder base and engage
towards the shoe grips an electrode extending between
respectively with said strap sides, and means acting on
the strap base and shoe, within the clamp.
'
said lever for turning the said arms about their pivots in
9. An- electrode clamp comprising a U-shaped holder
- the ‘direction which moves the strap sides towards the 75 having a base and side‘ cheeks, a current conducting shoe
3,026,444
6
accommodated between the said cheeks and supported
upon the said base, a U-shaped strap having a base and
sides mounted upon the holder with its base spanning
and its sides embracing and slidably engaging the said
cheeks, a forked lever having arms which embrace and
are pivoted upon the holder base and engage respective
ly with said strap sides, hooks provided upon opposite
sides of the holder base and upon the strap base, and a
heat shield disposed below the said holder and strap,
being suspended from the said hooks.
References Cited in the ?lev of this patent
UNITED STATES PATENTS
1,702,359
2,700,692
Molmark _____________ -_ Feb‘ 19, 1929
Carleton _____________ __ Ian. 25, 1955
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