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Патент USA US2116983

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May 10, 1938-
w. o. SCHULTZ
2,1 16,983
SWITCH CONSTRUCTION
Filed Oct. 2, 1955 '
3 Sheets-Sheetv l
INVENTOR.
BY
A
\
ORNEY.
, May 10, 1938.
w. o. SCHULTZ
‘
SWITCH CONSTRUCTION
2,116,983
Filed Oct. 2, 1935
3 Sheets-Sheet 2
//
\ |I
'
I NVENTOR.
M%m @ MM?
BY
A
ORNEY.
May 10, 1938.
w. o. SCHULTZ
2,116,983
SWITCH CONSTRUCTION
Filed Oct. 2, 1935
5 Sheet's-Sheet 3
unm m
IN VENTOR.
Patented May '10, 1938
2,116,983
UNITED STATES
PATENT
FFICE
2,116,983.
‘swrrcn CONSTRUCTION
William 0. Schultz, South Milwaukee, Wis., as
signor to Line Material Company, South Mil
waukee, Wis., a corporation oi‘ Delaware
Application October 2, 1935, Serial No. 43,207
5 Claims. (Cl. 200-48)
This invention relates to a switch construction
and is particularly directed to a high voltage
switch, such as a disconnecting switch, for in
stance, although the invention is not limited to
this type of switch.
5
ployed, that is to say, one having a plurality of
member is carried within the tubular body por
tion, the reciprmatory rod constituting the mov
able contact and being projected into a yielding
.tubular stationary contact which may be slotted
Further objects are to provide a switch of the
closed position, means being provided for auto
matically guiding the movable contacts into posi~
tion so that they will engage the stationary con
tacts in the proper manner.‘ ‘
Further objects are to provide a switch con
struction in which means are provided for ?rst
breaking the contact between the movable and
stationary contacts and thereafter raising the
switch arm, such means insuring the breaking
26 of any seal that may have occurred between the \
movable and stationary contacts without impos
ing severe stresses on the mechanism, the sep
"aration of the movable and stationary contacts
occurring prior'to the actual rocking motion of the
30
or a plurality of main switch arms may be em
played, in‘ which a tubular body portion is pro
above outlined type in which although the arms
oi the switch may be relatively ‘long, inaccuracies
due to machining and other work do not cause
lack of proper alignment between the movable
and stationary contacts when the switch is in
20
_
In greater detail, objects of this invention are
to provide a construction in which either a single
Objects of this invention are to provide a con
struction in which a multiple switch may be em—
switch arms which are simultaneously actuated.
10
avoiding any inaccuracies due to machining and
other work.
switch arms.
. -
'
Further objects are to provide a construction
in which a relatively light load is imposed dur
ing the lifting of the switch arms, as there are
no dragging contacts to be separated during this
35 motion, the separation of the movable and sta
tionary contacts having been made automatically
and prior to the lifting of the main switch arms,
and to provide an auxiliary switch arm or guid
ing member which cooperates with are horns to
40 maintain the electrical circuit after the sep
aration of the movable and stationary contacts
for the initial opening motion of the switch arms,
so that, any arcing that might occur, will occur
between the guide member and the arc horns,
45
such are horns and guide member being remov
able and easily renewed and of relatively simple
construction, the arc horns and guide member
additionally acting'as guiding means for guiding
50 the movable contacts into position for engage
ment with the stationary contacts, and the guide
member itself also constituting a stopcooper
sting with a portion of the stationary contact
structure to arrest closing motion of the main
.55 switch arms at the‘appropriate point, thereby
vided and a movable reciprocatory rod or contact
and which is springy and a?ords a secure and ex
tensive engagement between the movable and sta
tionary contacts.
,
Further objects are to provide a switch con
struction in which a very simple and easily pro
duced and easily renewable stationary contact is
provided which is housed and protected from the
weather, and in which the actual contacting por
tion is easily renewable without dismantling the
switch.
Further objects are to provide a switch con
struction in which the current does not pass
through any of the bearing members or any of
the joints, but is conducted directly from the
movable and stationary contacts to the terminal 25
members.
Further objects are to provide a novel form of
switch construction in which the main switch
arm is locked against rocking motion until after
withdrawal of the movable contact from the sta 30
tionary contact, and in which relative motion
between the stationary contact and the switch
arm is prevented until the switch arm is again
returned to its closed. position.
Further objects are to provide a switch con
35
struction which is relatively simple, which is
cheap to produce, which is eminently practical,
and which is easy to operate.
.
A11 embodiment of the invention is shown in
the accompanying drawings, in which:
Figure 1 is a ‘side elevation of the switch con
struction with parts broken away, the counter
balancing spring being omitted for clearness.
Figure 2 is a plan view of the structure shown 45
in Figure 1.
,
Figure 3 is a sectional detail of the movable
and stationary contacts and adjacent portion.
Figure 4 is a transverse sectional view on the
line 4-4 of Figure 3.
.
Figure 5 is a horizontal sectional view on the
50
line 5-5 of Figure 1.
Figure 6 is a fragmentary view of the joint por
tion or hinge portion of one of the main switch
arms, such view having parts broken away and 55
2
2,116,988 '
in section, such section being taken on the line
6-6 of Figure 2, the counter-balancing spring
being omitted for clearness.
Figure 7 is a fragmentary plan view of the
structure shown in Figure 6, with-parts broken
with slots 28. The slots 29 register with slots 23
formed in upwardly projecting webs 39 formed
integrally with the member i5, as most clearly
shown in Figures 6 and 7.
‘The portion 22 of the crosshead, see Figure 6,
away and in section, such parts as are in section
being taken on the line '|—-1 of Figure 6.
is provided with a pin 3| that extends completely
through the crosshead and into each of the pairs
Referring to the drawings, it will be seen that
the multiple switch is carried upon a supporting
of slots 28 and 29, thus normally locking the
members 21 to the stationary members 39 and
consequently locking the movable switch arm '10
10 frame indicated generally by the reference char
acter I and formed of channel iron or r-frame
members, or other structural steel work.
A plurality of switch units are- simultaneously
operated and the operating mechanism for the
15 switch units may take the form of a crank or
similar member indicated by the reference char
acter 2 in Figure 5 and coupled to the individual
rock levers 3 for the several switch units, as
indicated in Figure 5, by means of a series of con
20 necting rods or links 4, 5, 3,1, and 8. The shaft
9 carrying‘ the crank 2, see Figure 5, may be
operated by hand or automatically as desired and
may be spaced as far away from the main switch
mechanism as desired, to thereby provide for re
25 mote operation of the switch.
For example, the
switch may be externally located with reference
to a power house, substation, or similar shelter,
whereas the operating mechanism may ‘be located
interiorly thereof, if so desired.
30
'
Theswitch units are duplicates and, as will be
seen from Figure 1, an insulator stack I0 is pro‘
vided for the stationary contacts and a. widely
spaced insulator stack ' II is provided for the
pivoted end of the main switch arm I2, a rotary
35 insulator stack I3 being supported from each of
the levers 3 so that rotation of the crank 2 or
operating mechanism rotates the insulator stack
l3.
'
'
The insulator stack l3 carries a shaft i4 which
40
projects through the connector [5. The-connec
tor l5 in reality forms a conducting member from
the pivoted end of the main switch‘ arm I2 to the
terminal lug or member l6. However, a flexible
connector hereinafter described connects the ac
45 tive movable contact portion of the switch arm
directly with the connector I5. If, however, the
connector I5 is formed of a metal having a low
conductivity, the ?exible connector may be ex
tended to the terminal member IS in an obvious
'50 manner. A'crank I’! is rigidly secured to the
against rocking motion.
However, when the cross head is retracted,v
due to the operation of the crank H, the link l9
transmitting motion to the crosshead, it will be
seen that the pin 3| slides rearwardly within the 15
slots 28 and 29 and ?nally when the pin is in
alignment with the pivot pin 25, allows the con
tinued pull on the link H! to rock the movable
switch arm upwardly about the pivot pins 25,
the slots 28 being then turned at an angle to the 20
slots 29.
,
When, however, the crank is reversely rotated
to rock the switch arm downwardly, no relative
motion can occur between the movable member 23
and the tubular portion I2 of the main switch 25
arm, as the pin 3| is locked against motion due
to the fact that the slots 28 are now turned at an
angle to the slots 29. No relative motion be~
tween these parts can occur until the main switch
arm is in its lowermost or closed position, as in 30
dicated in Figure 1.
Y
i
If desired, a. counterbalancing spring 32, see
Figure '7, may be employed to offset the weight
of the main switch arm. The spring has been
omitted in Figures 1 and 6 for the sake of clear- ,
ness.
The insulator stack It) carries the stationary
contact member which consists of a tubular
contact portion 33 provided with a plurality of
saw-cuts 34 so as to split it into a plurality of
?ngers, as shown in Figures 3 and 4. .These
fingers have outwardly turned ends 35 and the
extreme inner end of the movable contact rod
or member 23 is ‘slightly bevelled to facilitate
entry of this movable contact member into the 45
stationary contact member. If desired, the re
silient gripping of the tongues may be increased
by encircling spring clips 36.
These spring clips I
have been shown ?at in Figures 3 and 4. but very
obviously they may be ‘formed in-each instance
shaft l4 in any suitable manner and is connected - with a. helix of spring wire with its ends joined.
by means of a universal joint indicated generally
at l8 to the link orconnecting rod l9.
The outer end of the link or connecting rod I9
55 is joined by means of a universal joint 20 with
a crosshead 2|. The crosshead 2| has the up
wardly projecting ears, as shown most clearly in
.Figures 2 and '1, between which the universal
joint is pivotally carried.v This crosshead ex
60 tends downwardly and has a reduced or narrowed
portion 22 into which the movable contact mem
ber or rod 23 is ?rmly screwed. This rod or
movable contact member 23 forms a portion of
the main switch arm I2.
65
>
In reality this main switch arm is of tubular
construction, as very clearly shown in Figures
1, 2, 6, and 7. The inner end of the tubular arm
I2 is screwed into the pivot yoke 24, the tubular
member l2 being preferably provided with a
70 bushing’ and guide l2’, see Figures 1,2, and 3,
screwed on to the end of the tubular arm l2.
The yoke 24 is pivotally carried on pivot pins
25 screwed into ears 26 formed integrally with
the member I5. This yoke 24 also includes a
75 pair of inwardly spaced parallel arms 21. provided
Any suitable encircling spring member can be
used.
'
The contact member 33 is screwed into an end
cap 31 which in turn is screwed into the tubular
portion 38 of the terminal casting 39. This ter- 1
minal member or casting 39 is provided with a
terminal tab or lip 49. It is to be noted from
Figure 4 that the terminal member 39 is pro
vided with outwardly projecting apertured ears 60
4| which receive the portions 42 of the arc horns,
such are horns being provided with downwardly
turned inner portions 43. These arc horns are
readily removable and are held in place by means
of set screws 44 so that they may be renewed
when they are worn.
A stop 45 in the form of a switch blade is car
ried by a split collar 49 clamped around the
tubular switch arm l2.- This stop when the
switch is in closed position, contacts with the 70
stationary terminal member 39 and holds the
movable switch arm in its lowermost position.
Further, this stop 45 passes into the space be
tween the arms 43, see Figure 4, of the arc horns,
preferably bevelled portions 43’ being provided 75
2, 1 1 6,983
- to assist in guiding the arm or stop 55 into place.
Thus it will be seen that the stop member 45
is guided by the arc horns and is arrested in its
lowermost position by the stationary terminal
member 39 and this serves to align the movable
contact member 23 with the stationary contact
member 33. Any inaccuracies in machining will
not interfere with the automatic and correct
aligning of the stationary and movable contact
10 members, as this is done in the manner here
inabove described.
It is to be noted particularly from Figures 6
and 7 that a ?exible connector 41 is bolted se
curely to the crosshead 2! and to the connector
' or bearing member l5.
Inasmuch as the slidable
or movable contact member 23 is tightly screwed
into the crosshead, it is at once evident that a
very good electrical connection is aiiorded direct
ly from the terminal member Hi to the movable
20 contact member 23.
The operation of the switch is as follows:
Assuming that the switch is closed, it is ap
parent that rotation of the crank or operating
member 2 rotates the insulator stack l3 and con
sequently the cranks I‘! of each of the switch
units. Inasmuch as the switch units are dupli
cates, a- description of the operation of one will,
of course, suffice. As the crank l'l rotates, it
draws the link l9 rearwardly and consequently
slides the movable contact rod or member 23
rearwardly out of engagement with the station
ary contact 33. After the movable contact has
cleared the stationary contact, the pin ill, see
Figures 6 and 7, is in alignment with the pivot
pins 25 and consequently the yoke 2t and the
movable switch arm B2 are now free to rise
upon continued pull of the link 89.
When it is desired to close the switch, reverse
rotation of the crank rocks the switch arm
40 downwardly to closed‘position. Motion of the
movable contact member is prevented as the slots
28 and 2a are not in alignment until the movable
switch arm 52 has arrived at switch closed posi
tion. Thereafter continued forward motion of
the link l9 causes the movable contact rod or
member 23 to pass into and engage the station
ary contact 33.
It will be seen that there is no lifting motion
required or permitted until the movable contact
has been withdrawn from the stationary contact
and consequently there are no dragging loads
imposed on the main switch arm during its up
ward motion.
'
,
Further, it will be seen that after the movable
contact member has been withdrawn from the‘
stationary contact member, that electrical con
tact is still maintained through the auxiliary
switch blade or stop member 45 and the arc
horns, and further that these members are the
last ones in contact and any arcing that occurs,
occurs between these members. They are readily
renewable and may be easily replaced without
dismantling the switch. Also they are of inex
pensive and simple construction.’
The stationary contact for each switch unit
is housed in its own hood or casing and is thus
protected from the weather. Any seal that may,
form between the movable contact and the sta
tionary contact is broken by the direct longi
70 tudinal motion of the movable contact member
without imposing any strains on the main switch
arm.
~
_
It- will be seen further that if wear should
occur on the stationary contact members, they
may be readily renewed as the end cap 31, see
Figure 3, may be unscrewed and a new station
ary contact member may then be substituted for
the old one. Further than this, the movable
contact member 23 can easily be renewed, as it
is merely necessary to unscrew it from the yoke,
see Figure 6.
>
Further it will be seen that a very reliable,
serviceable and simple type of switch has been _
providedby this invention which is cheap to
manufacture and which is relatively easy to
operate.
1"
Although this invention has been described in
considerable detail, it is to be understood that
such description is intended as illustrative rather
than limiting, as the invention may be variously 15
embodied and is to be interpreted as claimed.
I claim:
1. A switch comprising a stationary main por
tion, a switch arm pivotally mounted on said
main portion, a reciprocatory movable contact 20
guided and carried by said switch arm, a cross
head connected to the rear portion of said mov
able contact and reciprocable relative to said
switch arm, a stationary contact adapted to re
ceive the outer end of said movable contact, said 25
stationary main portion and said movable switch
arm having co-related aligning parts, means in
dependent of said contacts and actuated by said
crosshead for locking said co-related parts in
alignment until said movable contact has been 30
withdrawn from said stationary contact, and
means for moving said crosshead to‘ reciprocate
said movable contact and rock said switch arm.
2. A switch comprising a stationary main por
tion, a switch arm pivotally mounted on said main 35
portion, a reciprocatory movable contact guided
and carried by said switch arm, a crosshead con
nected to the rear portion of said movable con
tact and reciprocable relative to said switch arm,
a stationary contact adapted to receive the outer 40
end of said movable contact, said stationary main
portion and said movable switch arm having co
related aligning parts, means independent of said
contacts and actuated by said crosshead for lock
ing said co-related parts in alignment until said 45
movable contact has been withdrawn from said
stationary contact, and means including a crank
and link mechanism joining said crank and said
crosshead for reciprocating said crosshead and
for rocking said switch arm.
,
50
3. A switch comprising a stationary main por
tion having a stationary member provided with
an elongated slot, a switch arm pivotally mounted
on said main portion, a reciprocatory movable
contact guided and carried by said switch arm, a
crosshead connected to the rear portion of said
movable contact, a stationary contact adapted to
receive the outer end of said movable contact,
said switch arm having a portion adjacent the
pivotal end thereof provided with an elongated 60
slot aligning with said ?rst mentioned elongated
slot when said switch is in closed position, said
crosshead having a projecting portion ?tting
within both of said slots to normallylock said
switch arm to said stationary main portion while 65
said switch is in closed position, said crosshead
being free to reciprocate while said slots are in
alignment to thereby cause relative motion be
tween said movable contact and said switch arm,
and means for drawing said crosshead rearwardly
to place said projecting portion in alignment with
the pivot point of said switch'arm, said means
thereafter rocking said switch arm, the portion
of said switch arm havingthe slot rocking at an
angle to the first mentioned slot.
‘
.
75
4
a,11s,oss
i 4. A switch comprising a stationary main por
tion having a rigidly mounted stationary member
provided with an elongated slot, a switch arm
having a yoke pivoted to, said stationary member
and having a slotted portion rigid with said yoke
with the slot normally aligning with said ?rst
mentioned slot when said switch is in closed posi
tion, an arm projecting from said yoke and form
ing a portion oi! said switch arm, a stationary con
be:- provided with a pair of spaced webs rigid
therewith and provided with elongated slots, said
stationary member having a pair 01' spaced pivot
pins, a switch arm having a yoke pivotaliy car
ried by said pivot pins, said yoke having elongated‘
slots aligning with the elongated slots in said
webs when said switch arm is in switch closed po-‘
sition, 'a stationary contact, a movable contact
adapted to engage said stationary contact, and
movable‘ with respect to_said switch arm, a yoke 10
10 tact, a movable contact member movably carried
by said arm and adapted to engage said station _ operatively connected to said movable contact
ary contact, a crosshead operatively coupled to and having pins projecting through all oi’ said
said movable contact for withdrawing said mov
slots, said pins preventing rocking oi’ said switch
able contact irom said stationary contact and pro
vided with a pin ?tting within both of said slots,
and means for drawing said crosshead rearwardly
to withdraw said movable contact from said sta
tionary contact, said means when said crosshead
with said stationary contact, and means for draw 15
ing said crosshead rearwardly and sliding said
pins into alignment with said pivot pins, said
is in its ?nal retracted position aligning the pin
20 thereof with the pivot point of said yoke, said
switch open position and causing the slots of said
yoke to position themselves at an angle to the 20
'15
means thereafter rocking said switch arm to
switch open position.
5. A switch comprising a main stationary mem
arm while said movable contact is in engagement
means thereafter rocking said switch arm to
slots of said webs. ’
WIILIAM O. SCHULTZ. '
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