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Патент USA US3069529

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Dec- 18, 1962
E. H. WATERS
3,069,519
ELECTRICALLY OPERATED SWITCH
Filed April 5, 1960
5 Sheets-Sheet 1
.
INVENTOR
Edward H. Waters
93%? I
ATTORNEY
Dec. 18, 1962
E, H, WATERS
3,069,519
ELECTRICALLY OPERATED SWITCH
Filed April 5, 1960
3 Sheets-Sheet 2
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Dec. 18, 1962
E. ,4. WATERS
3,069,519
ELECTRICALLY OPERATED SWITCH
Filed Apm 5. 1960
s Sheets-Sheet s
United States Patent O?tice
3,959,519
Patented Dec. 18, 1962
2
1
contact operating mechanism to allow the contacts to
fall open under the pull of gravity. In capacitor switch
ing, this may result in opening speeds which are too slow
to prevent restrike conditions in the capacitor banks. To
retain the simple, dependable solenoid operated contact
corporation of Pennsyivania
operating mechanism of the prior patent and at the same
Filed Apr. 5, 196i), Ser. No. 20,654
time increase the speed of contact separation without
5 Claims. (Cl. 200-106)
adding costly means for storing energy in springs during
the contact closing operation, the present invention uti
This invention relates generally to electric switching
equipment, and more particularly to switches of the elec 10 lizes the trip solenoid to drive the contact operating
mechanism to, in turn, swiftly drive the contacts to the
trically operated type.
fully open condition. Limit switch means are added to
In many switching applications, such as the switching
deenergize the trip solenoid in response to the contact
of capacitors in response to voltage variations of a sys~
separation operation of ‘the contact operating means.
tem, it is desirable to have an inexpensive switch struc
A switch 17 is enclosed within a metal tank 27, which
ture which may be electrically operated in response to 15
is provided with an insulating liner 28,- and which is
such variations and which may have very fast contact
surmounted by a top casting 29. An incoming line enters
separation to provide for restrike free switching of ca
through a bushing 31 which terminates inside the tank
pacitor banks. It is also desirable to provide a contact
as a conducting stud 34 which is electrically connected
mechanism having longer life and lower maintenance.
It is further desirable that the switch be capable of with 20 to ?xed contacts in a manner hereinafter described in
detail. The switch 17 has two bushings, each with a
standing large momentary inrush currents that occur in
3,069,519
ELECTRIQALLY OI’ERATED SWITCH
Edward H. Waters, Bloomington, Ind, assignor to West
inghouse Electric Corporation, East Pittsburgh, Pa, a
capacitor switching.
conducting stud 34, 35 passing through the bushing and
Accordingly, it is an object of this invention to pro
vide a switch having a trip solenoid connected to swiftly
each terminating, at its bottom for electrical attachment
to ?xed contacts, but since FIG. 1 shows an approximate
drive a simple lever type operating means, which, in turn, 25 central section through the switch, the second bushing
and stud 33,- 35, respectively, are not visible in FIG. 1
drives the contacts to the fully opened condition.
but are shown in FIG. 2.‘
‘
More speci?cally, it is an object of this invention to
The contact assembly is comprised of ?xed contacts
provide in a switch a trip solenoid operable to drive the
and movable contacts mounted on a common support
operating mechanism to the fully opened condition and
wherein a limit switch operated by the operating mecha 30 attached to the top casting. Speci?cally, a pair of elon—
gated support members 36, 37 each having an offset por
nism at the end of a contact separation operation deen
tion 38, 39 at the lower end, are suspended from bosses
ergizes the trip solenoid.
40, 41 in the top casting 29, as by bolted brackets 42,
' It is another object of this invention to provide a novel
43 so that the supports extend downwardly between the
contact mechanism having the movable ‘contacts and
- previously described bushings 31 and 33. The supports
are constructed from any suitable insulating material
sure alignment between the contacts.
and are mounted in parallel relationship by means of a
More speci?cally, it is an object of this invention to
pair of spacers 44, ‘45 connecting the supports together
provide in a circuit interrupter, a contact mechanism
at the top and bottom, respectively. Each of a pair of
wherein initial contact is made on the tips of the con
tacts, which contacts are wiped clean as the closing cycle 40 ?xed contact mounts 46, 47, comprising an elongated
?at conductor, is attached to the outside of one of the
is completed to thus minimize resistance.
supports 36, 37, respectively, so as to lie partially on the
It is a further object of this invention to provide in a
upper'portion of the support and partially on the oifset
circuit interrupter a contact structure providing for strik
portion 38, 39, respectively, of the supports 36, 37. Each
ing action on one part of the contacts during a closing
mount includes an integral stud 48, 49 on the upper por
operation and conduction through another portion of the
tion for directly supporting the ?xed contacts as herein
contacts at the end of the closing operation.
?xed contacts mounted upon a common support to as
Other objects will, in part, be explained hereinafter
and will, in part, be obvious.
For a more complete understanding of the invention,
reference may be made to the following detailed descrip
after described, and includes an integral connector 50,
FIG. 3 is a perspective view of the limit switch assem
springs 54, 54 and 55, 55, each pair of springs encircling
a pin 56, 57 extending through the central portion of
corresponding pairs of ?nger contacts, each spring being
51 on the other portion.
Each connector is attached to
one of the hereinbefore described bushing studs 34, 35,
respectively, as by nuts.
A stationary contact assembly is provided on each
tion, which may be read in conjunction with the accom
mount 46, 47, each assembly comprising a pair of
panying drawing, in which:
opposed ?ngers 52, 52 and 53, 53 respectively, each pair
FIGURE 1 is a vertical cross-sectional view of a switch
of ?nger contacts having its corresponding members held
illustrating one embodiment of the invention;
FIG. 2 is a fragmentary and elevational view of the 55 at the upper end in opposed gripping relationship with
the corresponding stud 48, 49 by means of compression
switch of FIG. 1;
bly shown in FIG. 1;
FIG. 4 is a sectional view of the operating shaft and
lever of the limit switches of FIG. 1, showing the rela 60 compressed between one of the ?nger contacts and a
washer and pin assembly 58, 58 and 59, 59 at each end
tionship between the cams on the operating lever rod and
of each pin 56, 57. The lower ends of the ?nger contact
the respective limit switch arms; and
FIG. 5 is a sectional view of the switch taken sub
pairs have elongated contacts on the inward side and are
?ared outwardly and downwardly with respect to each
, Referring to FIG. 1, it will be seen that this invention 65 other. This structure effects a gradual spreading apart
action of the ?nger contacts of each pair under the im
may be embodied in a switch generally of the type dis
closed in Patent No. 2,701,828, issued February 8, 1955 a pact of the movable contact means, hereinafter described,
forced upwardly between the ?xed contact ?nger pairs.
to A. W. Edwards and Alvin W. Ogg and assigned to the
stantially along the lines V—-V of FIG. 1.
same assignee as this application.
' The movable contact assembly is provided for engage-4
ment with the ?xed contacts and comprises a pair of‘
In the switch mechanism of the previously mentioned
patent, a ?rst solenoid closes the switch and a second 70 parallel insulating support bars 6%‘, 61 each connected
solenoid‘ is utilized to trip the toggle mechanism of the‘ I at "one end to the offset portions 38, 39 of'the'siipports
8,069,519
4
36, 37 by means of a common pin 62 connected between
the insulating support members 36, 37, the other ends
rod necessary to allow the mechanism to go over toggle
as hereinafter described. Speci?cally, the resilient cou
of the support bars being connected together by a spacer
bracket 63. An elongated bridging contact member 64
having an upwardly extending tapering striker member
tween the support bars 69, 61 by means of a pair of
opposed pins 87, 88 each connected on one side of the
66 at each end, only one striker member being visible
block to one of the bars 66, 61 at a point substantially
pling assembly comprises a guide block 86 suspended be
in the drawing, is ?xedly attached to the bracket 63 per
pendicular to the contact bars 60, 61 so that the movable
midway along the longitudinal length of the bars 60, 61
between the pivot pin 62 and the spacer bracket 63. The
contact strikers 65, 66 may each become simultaneously
block 86 is centrally apertured to slidably receive the
engaged between the corresponding ?xed contact ?ngers 10 lower end of pull rod 72 which extends downwardly
when the contact bars 69, 61 are pivoted upwardly about
through the block 86. A pair of opposing guide channels
pin 62 to a horizontal closed position, as shown in FIG.
89, 96 are provided on the guide block 86 for receiving
1, from a lowermost fully opened position. A stop pin
a saddle bracket 91 having legs 92, 93 which slidably
67 joins the supports 36, 37 at the lower end and serves
straddle the block, each leg riding in one of the guide
to limit the opening movement of the movable contact
assembly. It is to be noted that the width of the striker
contacts 65, 66 is greater than the space between each
pair of ?xed contact ?ngers when the switch is in the
channels 89, 90 of the block 86. The lower end of pull
rod 72 is connected to the legs 92, 93‘ of the slidable saddle
bracket by means of a pin 94- through the legs 92, 93 and
the pull rod 72 therebetween. A washer 95 surmounts
fully opened position. This structure provides for the
the pin. A spring 96 is compressed between the washer
upper portion of striker contacts 65, 66 to initially strike 20 95 and the bottom of block 86. From the foregoing, it
the ?xed contacts at the lower ends, whereafter con
will be seen that the upward movement of pull rod 72
tinued upward motion of the contact bridge 64 effects a
in a switch closing action will pivot the movable contact
wiping action between the ?xed and movable contacts
bars upwardly around pivot pin 62 causing the movable
and a gradual spreading of the ?xed contact ?nger pairs
contact assembly to strike the ?xed contact assembly,
until at the termination of the closing action the lower
whereafter as the pull rod continues upwardly, forcing
end of the contact strikers 65, 66 are in contact with the
the movable contacts between the ?xed contacts, the
upper ends of the elongated ?xed contacts. Thus, initial
sliding bracket legs 91, 92 slide upwardly along block
contact is always made at the ends of the contacts which
86 to thus relieve the impact force and to cause com
are wiped clean as the closing cycle is completed to thus
pression of spring 96 between the pin 94 and the block
minimize resistance even after repeated operations. Fur
86 to urge the movable contacts upwardly into full ?nal
ther, the ?nal current path is through the base surfaces
engagement bet-ween the ?ngers of the ?xed contacts and
of the contacts, which surfaces are not subject to initial
to allow the pull rod 72 to come back down after the
striking action. The operating mechanism 70 is mounted
lever mechanism returns to the over toggle position, as
in a frame 71 which is bolted to the under side of the
shown in FIG. 1.
top casting 29. This operating mechanism 70 may be
To provide for electrically operating the switch 17 so
regarded as starting with the movable contact bars 60,
as to use it, for example, for controlling the connection
61 and including the upwardly extending insulating pull
of voltage regulating capacitors to a power system in
rod 72, the bottom end of which is connected to said
response to changes in the voltage of ‘the system, electro
movable contact member in a manner hereinafter de
responsive operating means 193 may be provided. The
electro-responsive means 163 may, for example, com
scribed. Pivotally connected, at 73, to the top of the pull
rod 72 is one of the two terminal pivot points of a rocker
prise an electromagnet having an armature 104 pivotally
member or lever 74, which ‘is shown, in its preferred
connected to the drive lever 79‘ by a pin 105, and upper
form, as a triangular plate, of a generally channel sec
tion, with an end base portion 74a and a shortened rear
leg portion 74b. The lever 74 may be disposed with its
base line nearly horizontal, with two terminal pivot
points 73 and 75 disposed near the ends of said base line,
and having an upwardly extending apex portion which
carries an intermediate rocker point 76, which is pivot
and lower operating windings 106 and 107, respectively.
These windings may be disposed between plates 169, 110
and 111 of magnetic material, which plates may be main
tained in spaced relation by bolts 112 which magnetically
link the plates. The armature 194 is so disposed that
when the upper winding 166 is energized, the armature
will be pulled upwardly by magnetic ?ux in the gap be
tween the upper plate 109‘ and the armature. It will
be pulled downwardly by flux in the air gap between the
lower plate 111 and the armature when the lower winding
167 is energized. This operates the handle 83 and drive
ally connected to a ?rst end of a normally nearly hori
zontal link 77 which will be subsequently described. The
second terminal pivot point 75 of the rocker member 74
is supported on the frame 71.
The link 77, which is pivoted at one end 76 to the top
lever 79 to open and close the switch.
of the triangular rocker member 74 has a second end 55
A pair of snap acting limit switches 113, 114 are pro
which is pivoted, at 78 to the inner end of an operating
vided to cutoff energization of the trip coil 166 and the
lever or drive lever 79. The outer end of the drive lever
closing coil 107, respectively, at the end of the trip and
79 is ?xedly attached to a cam shaft 80 positioned per
the close operations. The limit switches 113‘ and 114
pendicularly to the operating lever 79' and mounted for
are ?xedly mounted by any suitable means on opposite
rotation about its own axis through an aperture 81 in 60 sides of the support bracket 82 previously described as
the lower portion of support bracket 82 bolted to the top
supporting the operating shaft 80, operating handle 83
casting 29 and extending through an apertured extension,
and operating lever 79. An insulator 115, 115 separates
not shown, of top casting 29. An operating handle 83
each limit switch from the bracket 82'. As shown in
is ?xedly attached at the inner end to one end of the cam
FIG. 3 particularly, the switches 113 and 114 are posi
shaft 80 by a pin 84. The outer end of the operating
tioned so that their respective operating levers 116, 117
handle 83 normally presses up against a stop screw 30‘
ride over a pair of corresponding cams 118, 119‘ respec
which is carried by the underside of the top plate of the
tively, on the cam shaft 80. FIG. 4 illustrates the rela
top casting 29.
tive positioning of the operating levers 116 and 117 and
The lower end of the pull rod 72 is attached to the
corresponding cams 118, 119 relating to FIG. 1 and FIG.
previously described movable contact assembly by means 70 3 wherein the switch 17 is in the closed condition. In
of a resilient coupling operable to absorb impact energy
FIGS. 3 and 4, switch 113 is shown in the closed position
when the movable contacts engage the ?xed contacts dur
while switch 114 is shown in the opened position. Alter
ing a switch closing operation and to urge the movable
natively, as the operating shaft 80 rotates from the
contacts into full engagement with the ?xed contacts and
position shown in a counterclockwise direction in re
to provide for a slight ‘amount of over travel of the pull 75 sponse to an opening operation to be hereinafter de
3,069,519
6
scribed in detail, cams 118 and 119 rotate, switch 113
snaps open and switch 114 snaps closed at the end of
the operation. The switch 113 is connected in the en
ergizing circuit for the trip coil 106 while the switch 114
is connected in the energizing circuit of the closing coil
107 in a manner which will be obvious to those skilled
in the art; accordingly, the conductors connecting the
I claim as my invention:
1. Switch means, comprising: separable contact means;
operating means for opening and closing said contact
means; said operating means including an operating shaft
rotatable about its central axis in a ?rst direction in re
sponse to an opening operation, and in the reverse direc
tion in response to a closing operation; a drive lever se
various elements in circuit have been omitted for the sake
cured to said shaft to effect opening and closing of the
of drawing simplicity.
contact means; cam means carried on said shaft and
rotatable therewith; electro-responsive means energizable
In the normal or closed position of the linkage, as
shown in FIG. 1, the link 77 is in [toggle lock with
respect to the operating lever 79‘. In other words, the
to be actuated in opposite directions to different positions
and connected to operate the drive lever in opposite di
pivotal point 78 of this toggle linkage is slightly below the
rections; limit switch means actuated by said cam means
to deenergize the electro-responsive means at the end of
line joining the two terminal pivots 80 and 76 of the
toggle, so that the weight or other opening bias of the 15 each opening operation and at the end of each closing
operation of the operating means, and manually operable
movable contact assembly tends to rock the rocker mem
means for also actuating the drive lever without discon
ber 74 in a counterclockwise direction about its second
necting the electro-responsive means mechanically.
terminal pivot point 75, so that said rocker member
2. Switch means, comprising: ?xed contact means;
presses the link 77 toward the operating lever 79' in
such direction that most of the thrust is taken by the 20 movable contact means movable into and out of engage
ment with said ?xed contact means; operating means for
cam shaft 80 and support 82, but a small portion of
effecting movement of the movable contact means into
said thrust is transmitted to the abutment 30 for the
and out of engagement with the ?xed contact means;
operating handle, in the normal closed position of the
said operating means including a pivoted drive lever op
mechanism. The weight or other biasing force of the
movable contact assembly is borne by the pivot 75, which 25 erable from a first position to a second position to effect
a contact opening operation of the operating means, and
is supported in the frame 41.
operable from said second position to said ?rst position
In operation, the movable bridge contact striker mem
to effect a contact closing operation of the operating
bers 65, 66 are wedged between the corresponding ?nger
means; cam means driven by said drive lever; electro
contacts 53, 53 and ‘52, 52 respectively, de?ecting the
?ngers to provide two parallel current paths through each 30 responsive means connected to said drive lever and actua
ble in Opposite directions to selectively move the lever
?nger pair to provide a magnetic attraction between the
?ngers to counteract blow open force encountered on
about its pivot for effecting operation of the operating
means; means including limit switch means actuated by
high momentary inrush current.
said cam means and responsive to the position of the
An electrical tripping operation may be initiated by
energizing the trip winding 106 through the closed limit 35 drive lever in said ?rst position and said second position
to deenergize the electro-responsive means, and manually
switch 113 causing armature 104 to be driven upwardly
operable means for also actuating the drive lever about
and raising drive lever 79. This action initially releases
its pivot without disconnecting the electro-responsive
the toggle arrangement of levers 79 and 77 and initiates
means mechanically.
counterclockwise rotation of cam shaft 80 to effect the
3. Switch means, comprising: ?xed contact means;
previously described cam action with respect to limit 40
movable contact means operable to be moved into and
switches 113 and 114. Thereafter, the continuous ener
out of engagement with the ?xed contact means; a push
gization of trip coil 106 forces lever 79 upwardly, which
rod connected to the movable contact means; lever means
in turn applies force through levers 77 and 74 to force
connected to said push rod and operable in opposite di
fully plunge the push rod 72 rapidly downward to break
open the contact mechanism. At the same time, counter 45 rections to actuate said push rod to effect opening and
closing operation of the movable contacts; said lever
clockwise movement of cam shaft 80 effects a camming
means including a drive lever movable in opposite direc
action on switches 113 and 114 so that as the contacts
tions between predetermined limits to provide opening
reach the fully opened position, the cams 118 and 119
and closing driving forces to operate the lever mecha
reach the fully rotated position effecting a snap open op
eration of switch 113 to thus interrupt the energization 50 nism; cam means driven by said drive lever; electro
responsive means connected to said drive lever and actua
of trip coil 106, and to simultaneously effect a closing
ble in opposite directions to provide a driving force to
operation of switch 114 to thus set up an operating cir
selectively move said drive lever to effect contact opening
cuit for the closing coil 107.
and closing operation of the lever means; and auxiliary
The switch 17 may be closed electrically by completing
the energizing circuit for the operating winding 107 55 switch means actuated by said cam means and responsive
to movement of the drive lever to said limits to de
through closed switch 114. The armature 104 is there
energize the electro-responsive means.
upon pulled downwardly. Lever 79 is driven clockwise
4. Switch means, comprising: ?xed contact means;
to effect clockwise rotation of lever 74 about pin 75.
movable contact means operable to be moved into and
The pull rod is raised and bridging contact 64 is drawn
into engagement with the stationary contacts. The toggle 60 out of engagement with the ?xed contact means; a
push rod connected to the movable contact means; lever
relation of levers 79 and 77 is restored, thus holding the
means connected to said push rod and operable to ac
switch 17 in the closed position. Cam shaft 80 is rotated
tuate said push rod to effect opening and closing opera
clockwise to the position shown in the drawing, thus
tion of the movable contact means; said lever means
effecting a camming action to open switch 114 to de
including a drive lever pivoted for movement between
energize the closing coil 107, and to close switch 113 to 65 two limits to provide opening and closing driving forces
set up the trip circuit.
to operate the lever mechanisms; electro-responsive
If desired, an electrical counter, not shown, may be
means connected to said drive lever and energizable to
connected in series with the closing coil to record the
provide driving forces in opposite directions to selec
number of switch operations.
70 tively move said drive lever to effect contact opening
Having described a preferred embodiment of the in
and closing operation of the lever means; and cam means
vention, it is desired that the invention be not limited to
movable with said drive lever in opposite directions to
the particular construction, but that various modi?cations
deenergize the electro-responsive means upon comple
and changes may be made without departing from the
tion of each operation of the lever means.
spirit and scope of this invention.
5. Switch means, comprising: ?xed contact means;
75
8
movable contact means operable to be moved into and
out of engagement with the ?xed contact means; a push
rod connected to the movable contact means; lever
means connected to said push rod and operable to actu
ate said push rod to e?ect opening and closing opera
lever means; and ‘snap acting auxiliary switch means
actuated by said cam means when the drive lever is at
said limits to deenergize the electro-responsive means.
tion of the movable contacts; said lever means including
‘a drive lever movable in opposite directions between two
UNITED STATES PATENTS
limits to provide opening and closing driving forces to
operate the lever mechanisms; cam means driven by
said drive lever; electro-responsive means connected to 10
said drive lever and actua'ble in opposite directions to
provide driving forces to selectively move said drive lever
to effect contact opening and closing operations of the
References Cited in the ?le of this patent
1,116,504
2,253,557
2,795,671
2,832,010
2,867,736
2,870,288
2,961,510
Simon _______________ __ Nov. 10,
Collins ______________ __ Aug. 26,
Edwards ____________ __ June 11,
Chabala _____________ __ Apr. 22,
Wiswell _____________ __ Jan. 6,
Schmidt _____________ __ Jan. 20,
1914
1941
1957
1958
1959
1959
Baird _______________ __ Nov. 22, 1960
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