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Патент USA US3038058

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June 5, 1962
3,038,048
R. J. LANG ETAL
AUXILIARY CIRCUIT INTERRUPTER
Filed NOV. 28, 1960
2 Sheets-Sheet 1
INVENTO RS.
6:44am J [44/6
604mm J Jean/Kazan
BY
‘I R7007
WlrrqzMEX
June 5, 1962
R. J. LANG ETAL
3,038,048
~AUXILIARY CIRCUIT INTERRUPTER
‘Filed Nov. 28, 1960
'
v
2 Sheets-Sheet 2
lrraiwzy,
United States Patent 0
3,038,048
Patented June 5, 1962
2
l.
doubt as to whether the cartridge is in operating condi
3,038,048
tion, or for that matter, whether or not a cartridge had
AUXILIARY CIRCUIT INTERRUPTER
Richard J. Lang, Franklin, and Raymond J. Bronikowski,
South Milwaukee, Wis., assignors to McGraw-Edison
Company, Milwaukee, Wis., a corporation of Delaware
Filed Nov. 28, 1960, Ser. No. 72,174
11 Claims. (Cl. 200-120)
been previously installed in the cutout. This latter con
dition cannot be readily ascertained by the lineman. An
additional disadvantage of these type devices is that the
switch or cutout must be “specially” modi?ed in order to
receive the cartridge; a great disadvantage from ‘a cost
standpoint and from the point of view of applying this
technique to existing circuit interrupting devices.
This invention relates generally to auxiliary circuit
interrupters and more particularly to an improved, man
ually operable, portable circuit interrupter for interrupting
10
It is therefore an object of this invention to provide a
simple, inexpensive, portable load break (auxiliary cir
cuit interrupter) device that can be used with a wide
load current on fuse cutouts, disconnecting switches and
variety of existing cutouts and switches without prior
the like.
modi?cation of said cutouts and switches.
On occasion it becomes necessary to de-energize a high
Another object of this invention is to provide a manually
voltage power line as by moving the fuseholder of a fuse 15
cutout or the switch blade of a disconnecting switch to
operable, portable, load break device that extinguishes the
If the fuse link in the fuse
arc accompanying “opening” of a switch or cutout under
tube of the cutout has not been previously ruptured, arcing
will take place between the fuseholder contacts and the
load, by spewing forth a ?uid which serves to elongate
an open circuit position.
stationary contacts on the fuse support as the fuseholder
is moved to an open circuit position. The same condi
tion is experienced in a disconnecting switch between the
and de-ionize the arc at an early current zero.
Another object of this invention is to provide a port
able load break device that has a minimum number of
moving parts which will be subject to electrical or mechan
ical malfunction.
movable switch blade and the stationary switch contacts
A further object of this invention is to provide a port
as the blade is moved to open circuit position. In both
cases, severe burning of the separating contacts may take 25 able load break device that has a minimum number of
components that need be replaced after operation of the
place thereby seriously hampering or destroying the use
device.
fulness of the device.
A still further object of some embodiments of this
In addition to the damage suffered by a cutout or switch
invention is to provide an auxiliary circuit interrupter
as a result of uncontrolled arcing there is also the possi
which is so designed that the angle of the ?uid blast rela
bility that the uncontrolled arc may ?ash to ground across
The resultant fault may cause
tive to the separating contacts of the cutout or switch will
damage to other equipment on the line, and may seriously
injure the lineman who has opened the cutout or switch.
remain constant for any angle to which the fuseholder or
the cutout or switch.
When a fault condition of this nature occurs, an auto
matic circuit breaker on the source side of the fault may
be called upon to clear the fault consequently interrupting
service on a large section of the line.
In any case a wide
switch blade is opened.
Other objects and advantages of our invention will be
apparent from the following description of the preferred
embodiments of the invention taken in connection with
the accompanying drawings in which:
variety of damaging effects may be experienced in this
FIG. 1 is a partially cutaway view, in side elevation
of the invention in conjunction with an open type fuse
type of operation.
Some prior art devices have attempted to correct arcing 40 cutout;
FIG. 2 is a partially cutaway view in side elevation of
between live, separating, contacts by means of a portable
a slightly modi?ed form of the invention in conjunction
circuit interrupting device ‘for bypassing the line current
around the fuse or switch and thus avoiding arcing when
the fuse is removed from the line or when the switch is
opened. In these type devices the arc is generally inter
with an enclosed fuse cutout;
FIG. 3 is a partially cutaway plan view of another
embodiment of the invention;
rupted in the portable circuit interrupting device.
A great disadvantage of this type of portable interrupt~
FIG. 4 is a view of a portion of the device of FIG. 3
device may occur since the interrupting device itself con
stitutes a portion of the circuit.
anism 23 is pivotally mounted on one end of the fuse
the cutout may be opened under load, there is always
utilized with a fuse cutout, disconnecting switch or the
taken along line 4—4; and
ing device is that the switch or cutout itself must be
FIG. 5 is a partially cutaway view in side elevation of
structurally modi?ed to be capable of combination with 50 another embodiment of the invention.
the portable tool in that auxiliary contact hooks or the
Referring now to FIGURE 1 an open type fuse cutout
like must be affixed to the cutout or switch. This type
is indicated generally at 10. The fuse cutout is of the
of portable device is also limited to use with open type
standard type and comprises an insulator 11, an upper
stationary contact assembly 12 including stationary con
cutouts and switches.
Due to the fact that prior art devices of this type rely 55 tacts 13, latch 14 and protective hood 15, a lower fuse
on evolving enough gases to extinguish the are it becomes
holder support 16 rigidly a?ixed to insulator 11 and
necessary to keep accurate records of the usage of the
having lower stationary contacts 17 af?xed thereto, and
device to check whether the device is capable of inter
a fuseholder assembly 18 including upper and lower con
rupting a particular circuit without additional maintenance.
tacts 19 and 20 respectively, and a fuse tube 21 contain
If a device that is incapable of interrupting a given circuit 60 ing a rupturable current responsive element (fuse link)
is utilized in an attempt to interrupt a given circuit, con
22 therein electrically bridging the upper and lower
siderable burning of the switch or cutout and interrupting
contacts 19 and 20. As is customary a pull ring mech
holder and has a portion thereof normally in contact with
Other prior art ‘devices, in attempting to correct the 65
latch
14 so that a downward pull on the pull ring serves
problem of uncontrolled arcing during opening of the
to impart an upward action to latch 14 thereby allow
cutout or switch, have utilized gas ?lled cartridges in the
ing the fuseholder to become unlatched and to pivot out
fuse cutout itself which, upon opening of the cutout,
of contact bridging position.
will spew gases in the general direction of the arc. How
It is to be understood at the outset that any one of
ever, since these cartridges are positioned within the cut
70 the embodiments of the invention herein contained may be
out for an inde?nite length of time prior to the time
3,038,048
like; the particular combinations shown being merely for
purposes of illustration.
The load break device of this invention is indicated
generally as 24 and comprises an elongate insulating
rod-like, handle member 25 having a projecting hook
member 26 affixed at the upper end thereof which is
adapted to engage pull ring 23. A support member 27
is a?ixed to the upper extremity of handle 25 as by nut
and bolt means 28.
In this connection it should be noted
4
loosening members 28 so that ?uid may be directed from
a different position relative to the cutout.
In PEG. 2 a modi?ed form of load break device 40' is
shown in conjunction with an enclosed fuse cutout 41
of the type having .an insulated box 42, upper and lower
stationary contacts 43 and 44 respectively, a door 45
mounted on the box 42 and pivotable about its base
with respect thereto, and a fuse tube 46 including upper
and lower contacts 47 and 48 respectively which is
that the body of the load break device may be mounted 10 mounted on the door and which contains a fuse link
on any conventional hook stick.
(not shown) which normally electrically bridges the con
The upper end of member 27 has af?xed thereto a
wide angle nozzle 29 and a tubular puncturing stud 30
tacts 47 and 48. The door 45 of the cutout 41 is pro
vided with an integral pull ring 49 on one end thereof.
which communicate with one another.
Adjacent one end
A downward force exerted on the pull ring 49 serves to
of the puncturing stud in member 27 is a cartridge guide
cavity 31 which is adapted to slidably receive a portion
pivot the door 45 about its base thusly removing the
of an expendable ?uid ?lled cartridge 32.
As can be
fuse tube from contact bridging position.
v
The load break device 4'9 (auxiliary circuit interrupter)
of FIG. 2, like that of FIG. 1, includes a support mem
seen in FIG. 1 the normal position of the cartridge head
ber 27" having an arm portion 27"’ at the upper end
32' is in touching relation, or in close proximity to, the
puncturing stud 30. Head 32' of cartridge .32 in contact 20 thereof to which an L-shaped lever 33' having an aper
ture 36' and a notch 35' is pivoted by means of pivot
with puncturing stud 30 may be of any sealing material
pin 34'. The device 40 is also similar to that of FIG.
which will break or puncture under relatively small
1 in that a trigger cord 37' is anchored to aperture 36'
impact or piercing forces and which will normally be
strong enough to provide sufficient sealing strength to
retain the pressurized ?uid in the cartridge.
A substantially L-shaped lever 33 is pivotally mounted
on an arm portion 27' of support member 27 by means
of pivot pin 34.
Lever 33 may have a notched portion
35 on one leg thereof so as to receive one end of expend
able cartridge 32. An aperture 36 on the other leg of
lever 33 is provided for anchoring a trigger cord 37
thereto. Eyelet means 38 may be af?xed to the lower
end of handle 25 and cord 37 may be passed therethrough
to the lower end of the stick 25.
The pressurized fluid contained in cartridge 32 and in
the following cartridges and cylinders (?uid receptacles)
to be described may be of any ?uid material suitable for
extinguishing an are, such as carbon dioxide, compressed
air, sulfur hexa?uoride, carbon tetrachloride, boric acid,
or the like.
In operation (under load) hook member 26 on handle
member 25 is engaged with pull ring 23 of cutout 10.
Axial pull on handle 25 will cause the fuseholder 18 to
in lever 33’ and when actuated, serves to force cartridge
head 32"’ of cartridge 32" against a tubular puncturing
stud 30' which extends into guide cavity 31' and which
communicates with a wide angle nozde member 29'.
The support member 27" of FIG. 2 is rigidly mounted
on member 59 which has a projecting hook portion 51
at its upper end which is adapted to engage the pull ring
49. A handle member 52 having eyelets 38’ for the
passage therethru of cord 37’ is pivotally connected to
the other end of member 50 as by means. 53. A torsion
spring 54 normally serves to axially align handle 52 and
member 50 but is of such a strength that relative motion
between handle 52 and member 50 may be accomplished
manually.
Mounted intermediate the ends of member
27” and above hook portion 51 of member 50 is a
projecting stop member 55 which is adapted to bear
against the outer face of door 45 when handle 52 and
member 50 are axially aligned.
It can be readily seen that when the hook 51 engages
pull ring 49 and stop member 55 abuts against door 45
that as the handle 52 is actuated to open the door that
pivot about support 16 and contact 19 to move away
the
relationship between the nozzle 29', pull ring 49, and
from upper stationary contact 13 thereby drawing an are
the intersection of the stop 55 and door ‘45 remains con
between contacts and/or between the latch 14 and the
stant for any angle to which the cutout door may be
contact 19. If this are is allowed to continue severe
opened (as shown by the dotted lines of FIG. 2).
burning of portions of the cutout may occur. To extin
Therefore the gases ejected thru the nozzle 29' will blast
guish this are before the contacts or other associated
in one direction relative to the arc, irrespective of the
portions of the cutout are damaged, a manual pull on 50 extent of door opening, thereby more e?iciently direct
cord 37 is initiated causing the lever member 33 to pivot
ing gases across the arc and extinguishing same.
about its pivot pin 34 thereby forcing the puncturable
After the arc is successfully interrupted the device may
head 32’ of expendable cartridge or cylinder 32 against
be removed from the cutout at which time the torsion
the puncturing stud 30 in the cavity 31 of support 27.
spring 54 will realign the handle 52 and member 50.
In forcing head 32’ against stud 30 the cylinder will be 55 As before all that need be done to prepare the auxiliary
punctured or cut, thereby allowing the carbon dioxide
circuit interrupter for further duty is to replace the cart
or other i?uid therewithin to escape therefrom and to pass
riddge 32” in the cavity 31’ with a new unruptured cart
outwardly through the interior of the stud 30 and through
r1 ge.
the wide angle nozzle 29.
The nozzle 29 serves to direct
the escaping ?uid toward the arc existing between the
Referring now to FIG. 3 there is shown a slightly
modified puncturing mechanism which may be used with
upper contact or associated cutout portions thereby caus~
either of the embodiments of FIG. 1 and 2. The device
ing the arc to be extinguished.
of FIG. 3 includes a support member 7t) having a wide
In actual operation the cylinder 32 should preferably
angle nozzle 71 and a tubular puncturing stud 72
be punctured immediately prior to “opening” of the switch
mounted thereon and in communication with the nozzle.
or cutout so that the escaping ?uids begin to extinguish 65 Support member '7!) is also provided with fastening
the are from its inception. After the switch or cutout is
means 73 which is adapted to engage a hook stick (not
successfully opened the load break device 24 may be
shown) for mounting the device thereon. If the punc
disengaged from pull ring 23 and a new cartridge may
turing mechanism of this embodiment is to be incor
be inserted in the cavity 31 and the expended cartridge
70 porated in a device like that of FIG. 2 the fastening
disposed of preparatory to re-using the device.
means 73 could be rigidly attached to an intermediate
While the device of FIG. 1 is shown as directing ?uid
member which would then be pivotally mounted on the
from a position above and to the front of the cutout it
is possible to re-position the support 27 around the
handle 25 or to move it along the axis of the handle by
upper end of a hook stick, but this is not shown. A
tubular portion 74 is affixed to support ‘it? and extends
at substantially right angles therefrom and has on the
3,038,048
5
free end thereof external screw thread 75. Intermediate
the ends of portion 74 is a notched peripheral area 76
which is adapted to receive a U-shaped latch washer 77.
The latch washer (FIG. 4) has an aperture 78 therein
for anchoring a trigger cord 79 which may be actuated
from the other end of the hook stick member. An aper
tured enclosing member 80 engages screw threads 75 on
tubular member 74 and serves as a seat for helical com
pression spring 81. A movable cylinder engaging mem
6
member 38 is pivotable with respect to the handle 86
and since the stop 99 serves as a positioning fulcrum
the nozzle 92 will be in a position to direct ‘gases in the
vicinity of the arc irrespective of the degree of opening
of the switch or cutout.
In the case of tool use with an
open fuse cutout or switch the stop 99‘ may be bifurcated
so that it will be prevented from slipping 01f the upper
part of the fuse cartridge or switch against which it is
biased.
In operation the operator actuates discharge means 95
ber 82 which serves as a seat for the other end of spring 10
on cylinder 94 causing arc extinguishing ?uids to be ex
81 is positioned in the bore of member 74 and has a
central aperture 82' therein. A ?uid containing cylinder
member 83 generally similar to the cartridge 32 of FIG.
pelled from the tank or cylinder. The ?uids so expelled
pass from the cylinder thru member 93’, thence pass up
1 is a?ixed at its neck portion 84 to member 82 as by
wardly thru tubing 93, by-pass 97, passage way 91 and
It can thusly be 15 are emitted from nozzle 92 in the vicinity of the upper
contacts of the disconnecting device. The handle mem
seen that when the cylinder 83 is attached to member 82
screw threads 85 or similar means.
‘in
that member 82 and the cylinder 83 are biased toward
ber may then be pulled downwardly to cause the fuse
the puncturing stud 72 by the spring 81 but that latch
holder or switch blade to be moved away from the sta
tionary contacts. Any arcing that would ordinarily take
77 normally prevents motion theretoward.
In operation the hook on the hook stick (not shown) 20 place between contacts is quickly extinguished by the di
rected gas or ?uid blast from nozzle 92.
engages the pull ring on the cutout or switch with the
It can be seen that the efficiency of the arc extinguish
wide angle nozzle 71 directed toward the upper station
ing ?uids is materially increased by virtue of the fact that
ary and movable contacts of the switch or cutout. A
the pivotal connection and stop 99 maintain a given an
downward pull by the operator on trigger cord 79 will
cause latch 77 to disengage ‘from movable member 82, 25 gle between the nozzle and the upper contacts so that
fluids are emitted in the direct path of the arc regardless
and member 82, under the force of spring 81 will carry
of the degree of opening of the ‘fuse cartridge or switch
the cylinder 83 into engagement with stud 72 which will
puncture the cylinder 83 causing the arc extinguishing
blade.
A pressure indicator 100 may be positioned on the
?uid therewithin to pass through stud 72 and nozzle 71
cylinder 94 to indicate the pressure within the cylinder
to the vicinity of the upper switch or cutout contacts.
30 so that when the pressure is insufficient to cause an arc
When the handle member is actuated to open the cut
to be extinguished, visual indication of this condition will
out or switch the are drawn between current carrying
be readily available to the operator prior to are inter
parts of the cutout will be extinguished by the ?uid emit
rupting attempts. This particular embodiment of the in
ted ‘from cylinder 83 and directed by nozzle 71 before
vention has the particular advantage of serving as an aux
serious contact burning and the like can occur.
35 iliary load break a number of times before maintenance
After the device has been utilized to ‘open a circuit in
is required since a tank full of arc extinguishing ?uid
terrupting device under load, a new cartridge is inserted
will su?ice for a number of current interruptions.
in member 82 and the member 82 held against the spring
It can thusly be seen that our invention relies on a
tension while latch 77 is replaced in the slot 76. The
non-current carrying portable load break tool which re
device is then ready for performing its function again.
In FIG. 5 another embodiment of the invention is 40 quires no prior adaptation of the cutout or switch for
use therewith and which never electrically becomes part
shown which may be utilized in conjunction with a switch
of the switch or fuse circuit but which relies on ?uids
or cutout and which comprises a tubular, elongate, in
emitted from a cylinder to extinguish arcs created in
sulating handle member 86 having within the con?nes
opening a switch or cutout under load. Hence there is
thereof an insulating tubular member 93 which may be
no chance of electrical malfunction of the load break
of rubber, plastic or other material which will serve as
tool or of injury occurring to the lineman as a result of
a conduit for are extinguishing ?uid. Positioned adja
cent the lower end of the handle 86 and rigidly a?ixed
the malfunction. Further, since there are very few mov
ing parts in the load break tool of the invention mechani
thereto is an arc extinguishing ?uid ?lled pressurized,
cal malfunctions and damage and injury associated there
manually operable, cylinder 94 having actuating means
with are minimized.
95 operably associated therewith. A tubular conduit
The device is especially useful in that a quick visual
member 93’ is connected between tubing 93 and cylinder
inspection of the cartridge or cylinder will determine
94 so that upon actuation of member 95 ?uid will be
passed from the cylinder to the tubing. The cylinder 94
whether the device is capable of opening ‘a particular
circuit interrupter or disconnecting device i.e. by looking
is shown as being attached to the member 86 by strap
55 at the pressure gauge or by checking to see if the cartridge
means 96 but any similar af?xing means will suffice.
A nozzle support member 88 is pivotally attached to
has been punctured. If a pressure gauge is not utilized
the upper end of hook stick 86 by means of pivot pin 89
in conjunction with the cylinder of FIG. 5 it is also con
and torsion spring 90 which normally serves to align
ceivable that an indication of cylinder capabilities may
members 86 and 88. The upper end of member 88 is
be given by the weight thereof.
60
of a curvate con?guration and has a tubular passageway
While four particular embodiments of the invention
91 therethru which culminates in a wide angle nozzle
have been shown and described, it will be obvious to
member 92. A hook member 87 is situated on member
those skilled in the art that various changes and modi?ca
88 and is adapted to engage the pull ring of a cutout or
tions can be made therefrom without departing from the
switch. The wide angle nozzle member 92 is shown as
invention and, therefore, it is intended that the appended
being attached to nozzle support 88 although it may be 65 claims cover all such changes and modi?cations as fall
a machined portion thereof if this is desired but this is
within the true spirit and scope of the invention.
not shown.
We claim:
A ?exible ‘by-pass tube 97 is attached to members 88
1. A load break tool ‘for a circuit disconnecting de
and 86 as by means 98 and communicates with passage
vice of the type having a pair of spaced contacts and a
70
way 91 and insulating tubular member 93 thereby serving
contact bridging member movable into and out of elec
as a ?uid by-pass around the pivotal connection between
trical bridging engagement with said contacts and in
members ‘86 and 88.
cluding
a hook receiving member at one end thereof;
Intermediate the ends of nozzle support 88 is a pro
jecting stop member 99 ‘which is adapted to normally
said tool comprising an elongate manually operable han
bear against a portion of the cutout or switch. Since the 75 dle member having a portion thereof adapted to re
8,038,0438
7
leasably engage said hook receiving member, cylinder
a disconnecting device of the type having a pair of spaced
support means attached to said handle member and have
stationary contacts and a contact bridging member mov
able into and out of bridging engagement with said con
tacts and including a hook receiving member at one end
ing mounted thereon a cylinder containing an arc ex
tinguishing ?uid under pressure, ?uid directing means
extending beyond one end of said handle member and
attached thereto and in communication with said cylin
der for directing ?uids in the direction of the contacts
at one end of said bridging member, and manually oper
able means ‘for releasing at least a portion of said ?uid
thereof; said interrupter comprising, a manually operable
handle member, means pivotally mounted with respect to
said handle member for engaging said hook receiving
member so that a downward pull on said handle member
will cause said bridging member to move out of bridging
in said cylinder, whereby opening of said disconnecting 10 engagement with said contacts, ?uid directing means
device under load is accomplished by a downward axial
pull on said handle member while actuating said man
pivotally mounted with respect to said handle member for
directing ?uid in the vicinity of the electrical arc created
ually operable means to release are extinguishing ?uid
from said cylinder to said fluid directing means thereby
extinguishing the electrical are drawn between moving
current carrying portions of said disconnecting device
and minimizing pitting and burning of said portions.
by removal of said bridging member from contact engage
ment under load, stop means pivotally mounted with
respect to said handle member and normally abutting
upon a movable portion of said disconnecting device, are
extinguishing ?uid ?lled receptacle means for proving a
source of ?uid to extinguish the electrical are created
2. A portable load break tool for a circuit disconnect~
ing device having a pair of spaced contacts and a con
upon removal of said bridging member from bridging
tact bridging member pivoted at its lower end for move 20 engagement with said contacts, manually operable means
ment into and out of circuit bridging engagement with
for releasing at least a portion of said ?uid in said re
said contacts and including a hook receiving member
ceptacle, and means ‘for conveying said released ?uid to
mounted at its free end; said tool comprising, a handle
said ?uid directing means, whereby said ?uid directing
member, a support member a?ixed to one end of said
means, said means for engaging said hook receiving mem
handle member, a hook member a?ixed to ‘the same end
her and said stop means describe similar arcs upon re
of said handle for engaging said hook receiving member,
moval of said bridging member from contact bridging en
an arc extinguishing ?uid ?lled, puncturable cylinder
gagement thereby enabling ?uid spewed thru said ?uid
mounted on said support member, manually operable
directing means to be directed in the path of the elec
puncturing means mounted on said support member for
trical arc irrespective of the degree of pivotal movement
releasing said ?uid from said cylinder, ?uid directing
means in communication with said cylinder and normally
directed toward the contacts at the free end of said
bridging member, whereby said tool is utilized to impart
relative motion to said bridging member with respect to
said stationary contacts and the electrical are created
by moving said bridging member under load is ex
tinguished by ?uids liberated from said cylinder and di
rected by said ?uid ‘directing means into the vicinity of
said contacts.
3. A portable load break tool for a disconnecting de
vice of the type having a pair of spaced apart contacts
and a bridging member movable into and out of circuit
bridging engagement with said contacts and including a
hook receiving member mounted at one end thereof; said
portable load break tool comprising in combination, han
dle means, a support member pivotally mounted on
one end of said handle means and including a hook
member mounted thereon which is engageable with said
hook receiving member of said disconnecting device,
wherein downward movement of said handle means serves
to remove said bridging member from circuit bridging
position, said support member having means thereon
which normally abuts against a portion of said discon
necting device and a cartridge guide portion, ?uid di
recting means associated with said cartridge guide por
tion of said support member for directing ?uid in the
vicinity of the are created upon removal of said circuit
bridging member from the circuit under load, a tubular
puncturing member mounted on said support member
and in communication with said ?uid directing means,
a ?uid ?lled puncturable cartridge slidably received in
said cartridge guide portion of said support member,
lever means pivotally mounted on said support means
and engaging a portion of said cartridge, means con
nected to said lever means and operable from ‘the other
end of said handle means for causing said lever to urge
said cartridge against said puncturing means to liberate
?uid from said cartridge and allow same to pass to said
?uid directing means thereby enabling the‘ arc created
during removal of said bridging member from circuit
30
of said bridging member.
5. A load break tool for a disconnecting device of the
type having a pair of spaced contacts and a contact bridg
ing member pivoted at one end for movement into and
out of electrical bridging engagement with said contacts
and including a hook receiving member at its free end;
said tool comprising means engageable with said hook
receiving member for removing said contact bridging
member ‘from electrical bridging engagement with said
contacts, a ?uid receptacle associated with said engage
able means, said receptacle being ?lled with an are ex
tinguishing ?uid under pressure, manually operable means
associated with said receptacle for discharging ?uid there—
from, and ?uid directing means operable to direct ?uid
in the general direction of the free end of said bridging
member, whereby when said engageable means is engaged
with said hook receiving member and actuated to disen
gage the free end of said bridging member from said
contacts under load the resultant arc may be extinguished
upon manual excitation of said discharge means thereby
allowing ?uid to pass to the vicinity of said arc.
6. A load break tool as in claim 5 wherein means are
provided in conjunction with said ?uid directing means
for maintaining a constant angle between said ?uid direct
ing means and the free end of said contact bridging mem
ber irrespective of the degree of pivotal movement of
said contact bridging member.
7. A portable auxiliary circuit interrupter for use ‘with
a fuse cutout, switch or the like comprising, in combina
‘tion, a handle member, means ‘attached to said handle
member for removing a fuseholder switchblade, or the
like from contact bridging position, cartridge support
means attached to said handle member, an expendable,
arc extinguishing ?uid ?lled, puncturable cartridge sup
ported by said cartridge support means, stationary punc~
turing means normally spaced apart from said cartridge
‘and mounted on said supporting means, resilient means
urging said cylinder into engagement with said stationary
puncturing means, releasable latch means mounted on
said support member for normally preventing said cylin
bridging position to be extinguished, whereby positioning
der from moving into engagement with said stationary
puncturing means, manually operable means connected
of said ?uid directing means relative to the ‘free end of
to said latch means and operable to release said latch
said bridging member is constant irrespective of the de~
means thereby permitting said cylinder to impinge upon
gree of movement of said bridging member.
said stationary puncturing means, and nozzle means
4. A portable auxiliary circuit interrupter for use with 75 mounted on said cartridge supporting means for directing
3,038,048
9
?uids discharged from said cylinder toward the vicinity of
10. A load break tool as in claim 8 wherein means are
the are created upon opening of said cutout, switch or the
provided for maintaining a relatively constant angle be
like under load, whereby upon removal of said tuseholder,
switchblade or the like from contact bridging position
member during removal of said movable member from
under load, the resultant arc may be extinguished upon
electrical bridging position.
release of said latch means thereby providing ?uid to
said nozzle means which ?uid is directed in the vicinity
11. A load break tool for a circuit disconnecting de—
vice of the type having a pair of spaced contacts and a
contact bridging {member movable into and out of electri
cal bridging engagement with said contacts and including
tween said nozzle means and a portion of said movable
of the arc to thereby extinguish same.
8. A load break tool ‘for a disconnecting device of the
type having spaced apart upper and lower contacts,,a 10 a hook receiving member at one end thereof; said tool
movable member pivoted at one end normally electrically
comprising an elongate manually operable handle mem
bridging said contacts and including a hook receiving
her having a portion thereof adapted to releasably engage
member at the free end thereof, said tool comprising in
said hoot receiving member, cylinder support means at
combination an insulating handle member, hook means
tached to said handle member and having mounted there
mounted on one end of said handle member and engage
able with said hook receiving member to remove said mov
15 on a cylinder containing an arc extinguishing ?uid under
able member from electrically bridging position, an arc
extinguishing ?uid filled receptacle mounted near the other
pressure, manually operable means for releasing at least
a portion of said ?uid in said cylinder, said released ?uid
being e?ective to extinguish the arc incident to opening of
extremity of said handle member, manually operable
said circuit disconnecting device, whereby opening of said
means ‘for discharging a portion of the contents of said 20 disconnecting device under load is accomplished by a
receptacle, tubular means in communication with said
downward axial pull on said handle member while actu
cylinder for carrying the discharged ?uid from said re
ating said manually operable means to release are extin
guishing ?uid ‘from said cylinder to thereby extinguish the
ceptacle to said one end of said handle member, and noz
electrical are drawn between moving current carrying por
zle means in communication with said tubular means and
mounted on said handle member for directing ?uids dis 25 tions of said disconnecting ‘device so as to minimize pitting
and burning of said portions.
charged from said cylinder in the vicinity of the electrical
are created upon movement of said movable member out
of electrically bridging position.
9. A load break tool as in claim 8 wherein means are
provided on said receptacle for indicating visually the arc 30
interrupting capabilities of the ?uid contained therein.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,353,528
2,890,313
Triplett ______________ __ July 11, 1944
Smith et al ____________ __ June 9, 1959
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