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Патент USA US3052792

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Sept. 4, 1962
K. H. DATE
3,052,782
ICE BREAKING ATTACHMENT
Filed April 1, 1960
’
2 Sheets-Sheet 1
INVENTOR.
1911/0 Air/VP)’ ?irt‘
Sept. 4, 1962
3,052,782
K. H. DATE
ICE BREAKING ATTACHMENT
Filed April 1, 1960
2 Sheets-Sheet 2
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INVENTOR.
Afrzaa A/z-mey D47:
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United States Patent O?ice
3,852,782
Patented Sept. 4, 1962
2
1
path load interrupter generally designated 12.
3,052,782
ICE BREAKING ATTACHMENT
Kazuo Henry Date, South Milwaukee, Wis, assignor to
McGraw-Edison Company, Milwaukee, Wis., a corpo
ration of Delaware
Filed Apr. 1, 1960, Ser. No. 19,356
8 Claims. (Cl. 200—146)
Switch
10 includes a stationary contact 13 mounted on a metal
terminal adaptor 14 which in turn is supported on a
stationary insulator 15. A switch blade 16 is mounted
on a rotatable central insulator 18 for vertical swinging
movement, into and out of engagement with the sta
tionary contacts 13 when the insulator 18 is rotated. The
disconnect switch 13 is described in detail in Patent No.
2,830,144 to T. A. Fjellstedt which is assigned to the as
This invention relates to circuit interrupting devices
and, more particularly, to an ice breaking attachment 10 signee of the instant invention.
The auxiliary path load interrupter 12, which cooper
therefor.
The invention has particular application to load inter
rupting switches! of the type shown in ‘Patent No.
2,838,638 to K. H. Date and assigned to the assignee of
the instant invention. The device illustrated in this
patent is a high voltage air disconnect switch in combina
tion with an auxiliary path load current interrupter. The
ates with air disconnect switch 10, is mounted on a
conductive base 28 integral with the stationary contact
terminal adaptor 14. From the foregoing description
it is evident that the main current path through discon
nect switch it} commences at adaptor 14, extends through
the contacts 13, switch blade 16 and terminates in out
going adaptor 212 which forms a part of the switch frame
23 and which is in electrical engagement with the switch
air disconnect switch includes a switch blade mounted
on a rotatable insulator and cooperating ?xed contact
?ngers mounted on a stationary insulator. The circuit 20 blade 16.
Load interrupter 12 includes a hollow porcelain bush
interrupter is mounted adjacent the ?xed contact ?ngers
ing 24‘ which contains ?xed and movable contacts dis
and includes bypass contacts mounted on one end and
cooperatively engageable by a bypass rod electrically
and mechanically connected to the switch blade. This
provides a parallel current path so that the circuit may
be continued for a short time after the switch blade has
moved out of engagement with the contact ?ngers so
that a destructive arc is not drawn therebetween.
After
the switch blade has cleared the contact ?ngers and be
fore its fully open position is reached, the circuit inter
rupter is operated and then the switch blade engages
the bypass rod to move it out of engagement with the
bypass contacts. When the disconnect switch is reclosed,
a reverse operating procedure occurs, that is, the bypass
rod engages the bypass contacts, the circuit interrupter
is then operated to its closed position and thereafter the
switch blade engages the stationary contact ?ngers. It
can be seen that it is extremely important for good elec
posed in an arc extinguishing chamber, none of which
are shown. Operating mechanism for the movable con
tact is disposed in a metallic housing 26 mounted on the
upper end of bushing 24.
The circuit through inter
rupter 12 commences at the base and terminal adaptor
2t}, through the ?xed and movable contacts of the load
interrupter 12 and then to the metallic housing 26. The
load interrupter 12 is described in detail in Patent No.
2,886,673 to A. Van Ryan.
The load interrupt-er i2, is actuated by switch blade 16
oscillating a pair of external, triangularly shaped op
erating arms 35 which are a?ixed to a transverse operat
ing shaft 36 extending through housing 26. Trip arms
35 are bridged exteriorly of the housing 26 by a pair
of cross rods 38 and 39 which are spaced apart at its
outer corners. It will be noted with reference to FIG. 2
that as the main switch blade 16 swings in a vertical
trical contact to be attained between the bypass rod and
the bypass contacts so that arcing does not occur as 40 plane, its outer end engages trip arms 35 between cross
rods 38 and 39. When switch blade 16 has opened
the switch blade is moved into and out of its closed posi
su?‘iciently to strike across rod 38, trip arms 35 will be
tion. Such arcing would, of course, defeat the whole
rotated in a counterclockwise direction from their phan
purpose of the circuit interrupter.
tom position to their position shown by full lines, where
It is an object of the invention to provide an ice break
upon the circuit interrupt-er 12 will be opened. Similarly,
ing attachment for the bypass contacts of a load inter
when switch blade 16 is rotated from its opened to its
rupter switch.
closed position, it will engage cross rod 39 to return trip
It is another object of the invention to provide in a
arms 35 to their phantom position whereupon the load
load interrupting switch, ice break means that is oper
interrupter 12 is again reclosed. It will be appreciated
able to engage the stationary bypass contacts prior to the
opening or reclosing thereof. A further object is to 50 that switch arm 16 engages cross bar 38 to open the load
interrupter 24 after it has parted from the ‘stationary
provide such a device wherein the ice break member
contacts 13, and conversely upon reclosing that it will
is actuated by the switch blade.
engage cross bar '39 to reclose load interrupter 12 prior
These and other objects and advantages of the inven
tion will become apparent from the detailed description 55 to its re-engagement with the stationary contacts 13.
The bypass circuit also includes ?xed bypass contacts
of the invention taken in view of the accompanying draw
ings in which:
42 af?xed to the metallic housing 26 and a conductive by
pass rod 44- in electrical contact with frame 23 and mount
FIGS. 1 and 2 show a load interrupting switch in
ed thereon for rotation in a vertical plane as viewed in
which the instant invention is usable;
FIGS. 3-5 illustrate one embodiment of the instant in 60 FIG. 1. The ?xed bypass contacts 42 comprise a pair
FIGS. 6-9 illustrate alternate embodiments of the in
stant invention.
of resilient conductive rod-like members 45 which are
af?xed at one end to the metallic housing 26 and whose
free ends ‘are engageable by the contact rod 44. As ex
In general terms, the invention comprises the combina
plained more fully in the ‘aforementioned Date patent,
vention; and
tion of a load interrupting switch and an ice break mem— 65 bypass rod 44 will be engaged by switch blade 16 after
the latter has rotated operating arms 35 to their open
ber operable by the switch blade to engage the stationary
position, so that the bypass contacts 42 and 44 will not
bypass contacts prior to the engagement and disengage
be parted until after circuit interrupter 12 has been
ment ‘of the bypass rod therewith so that ice formed
on the stationary bypass contacts will be removed.
opened. Likewise, when switch blade 16 is reclosed, by
FIG. 1 shows a three-insulator, rotating, vertical break, 70 pass rod 44 will engage stationary bypass contacts 42
prior to the engagement of cross bar 39 by switch blade
air disconnect switch designated generally by the ref
16 so that the bypass contacts will be reclosed prior to
erence numeral 10, in combination with an auxiliary
"a
a.)
A
the reclosure of the circuit interrupter contacts. This
insures that the bypass circuit will be open when the
structure 62 so that any ice that is formed thereon will
be broken away.
In another embodiment of the invention shown in
bypass contacts open or reclose, so that there will be no
‘arcing therebetween.
The improvement which comprises the instant inven~
FIG. 7, the stationary bypass contacts 42b comprise a
5 pair of parallel trod-like members 70 which are bent in
tion includes an ice break attachment operable upon the
wardly at 71 and outwardly at 72 to form contact tips
opening or closing the main switch 16 to force rod-like
for cooperatively engaging the bypass rod 44. In order
members 45 apart thereby shattering any ice which may
to break ‘any ice which may form between the contact
be (formed therebetween.
tips, switch arm 16 is provided with an extension 74
In the embodiment of the invention shown in FIGS. 10 which passes through said contact tips each time the
2-5, the ice breaking attachment comprises an arm 54}
switch is moved between open and closed position.
suitably secured to the cross bars 38 and 39 and extend
In a further embodiment of the invention illustrated
ing upward therefrom. As seen in FIG. 3, arm 50 has
in FIGS. 8 and 9 the bypass contact rods 80 are looped
an enlarged bulb-shaped head 52;, a reduced neck portion
at ‘81 for pivotally supporting an ice break member 82.
53 and a body portion 54 which is attached to cross 15 Member 82 has an ice break arm 83 at its upper end and
bars 38 and 39.
It can be seen from FIG. 4 that each rod 45 is bent
inwardly near its ‘free end to form a contact tip 46 and
a pair of diverging operating arms 84 and 85 near its
lower end. In addition, trip arms 35 are provided with
a third cross bar 56 which engages the upper operating
outwardly at its extreme end 47 to form a guide for the
arm 34 when trip arms 35 are moved from their phantom
movable bypass rod 44. A pair of leaf springs 48 en
to their full position so that ice break attachment 82 is
gage the outer end of each of the rods 45 for urging them
also rotated from its phantom to its full position. As
toward each other.
a result, ice break arm 83 is forced between contact tips
When the switch 10 and the load interrupter 12 are in
37 to remove any ice formed thereon. In addition, when
their closed positions shown by the broken lines in FIG.
trip lever 35 is returned to its closed position cross arm
2, bypass rod 44 wil be disposed between the stationary
86 engages the lower operating arm 85 to again move ice
bypass contacts 46. As shown in FIGS. 4 and 5, a stop
break arm 83 between contact tips 87.
bar 55 is mounted on the springs 48 by means of pins
While only a few embodiments of the invention have
56 and slots 57 for limiting the movement of bypass
been shown and described, other modi?cations will be
rod 44.
come apparent once the inventive concept is known.
After trip arms 35 have been moved su?iciently to 30 Accordingly, it is intended to cover in the appended claims
ward their position shown by ‘full lines in FIG. 2, so
all such modi?cations falling within the true spirit of
that load interrupter I2 is tripped open, the bulbous head
the invention.
portion 52 of ice break arm 50' will engage members 45
I claim:
intermediate their point of attachment and their contact
1. In the combination of a disconnect switch and a load
tips ‘46. As head portion 53 :passes between rods 45,
interrupter, said disconnect switch having primary contact
contact tips 46 will be spread outwardly. This will shat
means including a movable switch blade, said load in
ter any ice that may have formed on them which would
terrupter being in a by-pass circuit connected in parallel
tend to prevent bypass rod 44 from disengaging and at
with said disconnect switch, said by-pass circuit including
the same time relieve the contact pressure on bypass
?xed and movable by-pass contacts operable by said
rod 44-.
switch blade to open after the opening of said primary
Ice breaking arm 50 is so proportioned that as the
widest portion of its head 52 passes between rods 45,
switch blade 16 will engage bypass rod 44 to ‘move it
away from contact tips 46 and toward its fully open
position. Continued upward movement of trip arms 35
moves the narrow waist portion 53 of ice break arm 50
between rods 45 so that they can relax somewhat.
When the disconnect switch 10 is rec-losed, contact arm
16 will engage the lower cross bar 39 to move trip arms 35
switch means, and an ice break member pivotally mount
ed on said interrupter adjacent said ?xed by-pass contacts
and actuable by said switch blade upon movement there
of toward open position to engage said ?xed by-pass con
tacts prior to the opening or reclosing of said by-pass
contacts so that any ice formed thereon will be- broken
away.
2. In the combination of a disconnect switch and a
load interrupter, said disconnect switch having primary
downwardly toward their phantom position shown in FIG.
contact means including a movable switch blade, said load
2. This moves the head portion 52 of ice break arm 50
interrupter being in a by-pass circuit connected in par
allel with said disconnect switch, said by-pass circuit in
cluding ?xed and movable by-pass contacts operable by
said switch blade to open after the opening of said pri
mary switch means, said ?xed by-pass contacts including
downwardly between rods 45. Again stationary bypass
contacts 46 are spread apart, thereby shattering any ice
that may have formed while switch 10 was open. Also,
while contacts 46 are in their extended or spread posi
tion bypass rod 44 will again slide therebetween so that
when the upper end of ice break arm '50 reaches a posi
tion below rods 45 said bypass rod is embraced there
between. As a result, ice does not interfere with the
re-establishment of electrical contact between bypass rod
44 and stationary bypass contacts 42. ‘In addition, the
contact pressure exerted by rods 45 further enhances cur
rent interchange.
a pair of opposed contact ?ngers, and an ice break member
mounted on said switch blade and movable therewith in
a plane that passes between said ?xed ‘by-pass contact
?ngers prior to the opening or reclosing of said by-pass
contacts so that ice formed thereon will be broken away.
3. In the combination of a disconnect switch and a
load interrupter, said disconnect switch having stationary
contact means and a movable switch blade, said load inter
In an alternate embodiment of the invention illustrated
rupter being in a by-pass circuit connected in parallel
in FIG. 6, the stationary bypass contacts 42a comprise 65 with said disconnect switch and being operable to inter
rupt and close said by-pass circuit after the opening and
a pair of parallel extending rod members 60 which are
reclosing of said disconnect switch, said by-pass circuit
bent inwardly and then outwardly at their free ends to
also including by-pass contact means having opposed con
form the stationary contact structure 62. Here the ice
break arm comprises a hook shaped member having a
rearwardly extending upper portion 63 and a body por
tion 64 which is a?‘lxed to cross bars 38 and 39. Each
time trip arms 35 move between their open and closed
positions shown by full and phantom lines, respectively
tact ?ngers mounted on said circuit interrupter and a co
70 operating contact rod movable into and out of engage
ment with said contact ?ngers by the rotation of said
switch blade while said load interrupter is open, said con
tact ?ngers being resiliently urged into contact pressure
engagement with said contact rod, and contact pressure
in FIG. 2, portion 63 slides between the stationary contact 75 relief means operable by said switch blade for engage
3,052,782
5
6
ment between said contact ?ngers prior to the engage
ment or disengagement thereof by said contact rod where
interrupter respectively, by-pass contact means in said
by the opening and closing of said by-pass contacts is
ing opposed contact ?ngers mounted on said circuit inter
rupter and a movable contact rod operable by said switch
blade after said circuit interrupter has been opened, and
facilitated.
4. In the combination of a disconnect switch and a load
by-pass circuit including stationary by-pass contacts hav
interrupter, said disconnect switch including stationary
an ice break arm mounted on said operating arm and
contact means and a cooperating switch blade adapted to
pivot into and out of engagement therewith, said load in
terrupter being in a by-pass circuit connect in parallel
pivotable therewith in a plane that passes between said
contact ?ngers, whereby said ice break arm is rotated
between said contact ?ngers prior to the opening and re
with said disconnect switch and having an operating arm 10 closing of said by-pass contact means so that any ice
thereon will be broken away.
engageable by said switch blade as it pivots away from
7. In the combination of a disconnect switch and a load
and toward said stationary contact ‘means for opening and
interrupter, said disconnect switch including stationary
closing said load interrupter respectively, by-pass con
contact means and a cooperating switch blade adapted to
tact means in said by-pass circuit including stationary by
pass contacts having opposed contact ?ngers mounted 15 pivot into and out of engagement therewith, said load in
terrupter being in a by-pass circuit connected in parallel
on said circuit interrupter and a movable contact rod
with said disconnect switch and having an operating arm
engageable by said switch blade after said load inter
engageable by said switch blade as it pivots away from
rupter has been opened, and an ice break arm associated
with said operating arm and disposed adjacent said con—
tact lingers and movable by said operating arm in a plane
that passes therebetween, whereby said ice break arm is
rotatable between said contact ?ngers prior to the open
ing and reclosing of said by-pass contact means so that
any ice formed thereon will be broken away.
and toward said stationary contact means for opening and
closing said load interrupter respectively, said by-pass cir
cuit also including stationary ‘by-pass contacts mounted
on said circuit interrupter and a movable contact rod op
erable by said switch blade after said load interrupter has
been opened, said load interrupter including an ice break
5. In the combination of a disconnect switch and a 25 member movable by said switch blade into engagement
with said by-pass contacts prior to the opening and re
load interrupter, said disconnect switch including station
closing of said by-pass contact means so that any ice
ary contact means and a cooperating switch blade adapt
formed thereon will be broken away.
ed to pivot into and out of engagement therewith, said
8. In the combination of an air break disconnect switch
load interrupter being in a bypass circuit connected in
parallel with said disconnect switch and having an oper 30 and a load interrupter, said disconnect switch including a
stationary contact jaw and a cooperating switch blade
ating arm engageable by said switch blade as it pivots
adapted to pivot into and out of engagement therewith,
away from and toward said stationary contact means
said load interrupter being in a bypass circuit parallel
for opening and closing said load interrupter respective
with said disconnect switch and having an operating arm
ly, by-pass contact means in said by-pass circuit includ
ing stationary by-pass contacts having opposed contact 35 pivotally mounted thereon which is engageable by said
?ngers mounted on said circuit interrupter and a mov
switch blade as it pivots away from and towards said
able contact rod operable by said switch blade after said
contact jaw for opening and closing said load interrupter
respectively, said by-pass circuit having by-pass contact
load interrupter has been opened, and an ice break arm
means including stationary by-pass contacts mounted on
said circuit interrupter and a movable contact rod op
erable into and out of engagement with said stationary by
pass contacts by said switch blade after said circuit inter
rupter has been opened, and an ice break member mount
ed on said operating arm and pivotable therewith into
any ice formed on said contact means will be broken
45 engagement with said stationary by-pass contacts prior to
away.
the opening and reclosing of said by-pass contact means
6. In the combination of an air break disconnect switch
so that any ice thereon will be broken away.
and a load interrupter, said disconnect switch including a
stationary contact jaw and a cooperating switch blade
References Cited in the ?le of this patent
adapted to pivot into and out of engagement therewith,
said load interrupter being in a ‘by-pass circuit connected
UNITED STATES PATENTS
in parallel with said disconnect switch and having an op
2,172,225
Scho?eld et al __________ __ Sept. 5, 1939
erating arm pivotally mounted thereon which is engage
2,426,009
Frank et a1. _________ _. Aug. 19, 1947
able by said switch blade as it pivots away from and to
2,905,794
Upton _______________ __ Sept. 22, 1959
ward said contact jaw for opening and closing said load
pivotally mounted on said load interrupter adjacent said
operating arm and movable thereby in a plane that passes
between said contact ?ngers, whereby said ice break arm
is rotated between said contact ?ngers prior to the open
ing and reclosing of said by-pass contact means so that
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