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Dec. 10, 1946.
Filed DeC. 4, 1943
Patented Dec. 10, 1946
Charles Gillings and Lawrence John Murray,
Liverpool, England, assignors to Automatic
Electric Laboratories, Inc., Chicago, 111., a cor
poration of Delaware
Application December 4, 1943, Serial No. 512,889.
In Great Britain January 21, 1943
3 Claims.
(0]. 179_27.54)
The present invention concerns crossbar
switches of the type in which in order to effect the
selection of a desired contact set, a preparatory
operation is effected for the row of contact sets in
which the desired contact set is located and an in
horizontal magnet) as well as means for deter
?exibly mounted selecting ?ngers corresponding
located respectively and the subsequent operat
ing and holding operations corresponding to the
mining the desired operating or holding oper
ation (e. g. the desired vertical magnet). It
has been proposed to employ a uniselector switch
separate and distinct from the crossbar mecha
operating and hold operation is subsequently ef
nism to select the desired horizontal magnet in
fected for the column in which the desired con
response to received impulses and the object of
tact set is located to effect the operation of
the present invention is primarily to avoid the
the desired ‘contact set while permitting the
necessity of providing a plurality of horizontal
preparatory operation to be repeated if required 10 magnets 01' their equivalent and in addition the
for the operation of *other contact sets in the
invention provides means whereby a crossbar
same row.
switch mechanism can be operated directly by
In one form of such switch there is provided
for each of the columns a holding bar member
According to one feature of the invention a
operable under control of an electromagnet, while _
crossbar switch is provided in which desired sets
for each pair of adjacent rows of contact sets
of contacts are operated due to initial prepara
there is provided a selecting or preparing bar
tory operations corresponding to the rows of con
member which carries a number of ?exible or
tact‘sets in which the desired contact sets are
to the number of vertical columns, and which
is operable under control of a pair of electromag
nets to move the selecting ?ngers into position
adjacent the contact sets of either of the pair
columns of contact sets in which the desired con—
tact sets are located respectively characterised
by the provision of a single step-by-step elec
tromagnetically operated mechanism arranged to
A IOU-point switch of this kind is provided with
e?ect by mechanical linkage initial preparatory
. ten rows and ten columns of contact sets and
operations for a plurality of operating and hold
with ?ve two-way horizontal selecting bars each
ing operations.
of which will carry ten selecting ?ngers corre
According to another feature of the invention
sponding to the ten vertical holding bars which
a crossbar switch is provided having parallel bars
will be required and at each of the ?fty inter 30 for effecting initial preparatory operations and
section points two sets of contacts will be pro
having other parallel bars for effecting operating
vided. In order to select a given set of con
and holding operations crossing said ?rst bars
of rows involved.
tacts the associated horizontal bar will be twisted
in a direction to bring its selecting ?ngers oppo
site the contact sets of the particular row of ten
in which the required contact set is located and
the subsequent operation of the vertical bar com
mon to all the sets of contacts in the same column
as that in which the required contact set is
located will operate this contact set due to the
fact that this will be the only one in the column
having a selecting ?nger interposed between it
self and the vertical bar.
.When this contact set has been operated the
horizontal bar may be released, but the contact
set operated will remain held from the verti
cal holding bar. Subsequently a second or fur
ther set of contacts can be operated in similar
manner provided it is in a different column to
the one already operated, but it may be located
on the same row.
With switches of the type referred to, in order
to select the desired contact set it is necessary
in which a shaft extending parallel to said other
bars is arranged in each of a number of differ
ent angular positions to select one of said ?rst
bars to effect an initial preparatory operation so
that when one of said other bars is operated
after one of said ?rst bars a contact set asso
ciated with the intersection of said bars is oper
ated and the shaft is free to be reset for the
selection of another contact set.
One example of the invention is illustrated in
the accompanying drawing comprising Figs. 1-4,
of which Fig. 1 shows a partial front elevation of
'9 a 100-point crossbar switch of the type described
with an impulse responding uniselector mechani
cally coupled thereto. Fig. 2 shows a view through
the line AA (Fig. 1), while Fig. 3 shows a view
through the line BB (Fig. 1). Fig. 4 shows a
perspective view of part of the mechanism of a
typical crossbar switch, further information about
which can be obtained from our application
Serial No. 476,898, ?led February 24, 1943, now
Patent No. 2,364,706, dated Dec. 12, 1944.
paratory operation to be effected (e. g. the desired 55
Referring now to Fig. 1, the crossbar switch is
to provide means to determine the desired pre
It will be understood that the invention is not
provided with ?ve horizontal bars such as H,
2| and 23, and ten vertical bars such as l2, the
latter being operated by the vertical bar mag
to an impulse responding switch. For instance
net armature Id. The contact sets are indicated
where the prepare operation is effective as a re
restricted to application to a group selector or
generally by the rectangles such as [3. The pair 5 sult of hunting for an idle or marked line, a wiper
of contact springs at the intersection of the
of the uniselector mechanism controlling the
horizontal bar II and vertical bar l2 are shown
in Fig. 4 where the contact spring sets are desig
prepare bars can be arranged to test the condi
tion of contacts marked by the lines being tested
While the magnet of the uniselector steps auto
on the horizontal bar being designated 26.
10 matically to advance the wipers. The arrest of
As regards the operation of the horizontal bars,
the wiper on the line selected corresponds of
the shaft it of the uniselector I5 is rotated in
course to the deflection of the horizontal bar and
response to a train of received impulses and there
of the prepare operation appropriate to the con
upon drives shaft l1 through suitable gearing IS
necting up of said line.
in such manner that for eleven steps of the uni 15
What we claim as new and desire to secure by
selector the shaft I6 makes a complete revolution.
Letters Patent is:
It will be seen from Fig. 1 and Fig. 2 that there
1. In a crossbar switch, lateral bars and longi
are ten pins l-ll arranged in a spiral on the shaft
tudinal bars so arranged that each lateral bar
l1 and the arrangements are such that in response
intersects all of the longitudinal bars, two sets of
to a single step of the uniselector the shaft (6 20 electrical contacts for each such intersection, each
rotates su?iciently to move the pin l into a posi
of said bars having a normal position, means
tion where it will rock the arm 19 ai?xed to the
mechanically linked with allof said lateral bars
end of the horizontal bar II thus causing the
and selectively operated to move any desired one
latter to rotate through a given angle and to bring
of the lateral bars in either of two directions
all the operating ?ngers associated with it into 25 away from its normal position, means for moving‘
their respective engagements.
any one of the longitudinal bars away from its‘
At the second’ impulse, shaft H makes a further
normal position, and means whereby the move
step and moves pin I out of engagement with
ment of any one of said lateral bars and any one
arm I9 thus restoring horizontal bar ! I to normal
of said longitudinalbars away from their 'respe’ce
under pressure of a conveniently mounted return 30 tive normal positions is effective to operate the
spring 21. At the same time pin 2 moves into
two contact sets for the intersection of those bars
engagement with arm 20 a?ixed to the second
selectively in accordance with the direction that
horizontal bar 2| thus operating this bar in simi
said one lateral bar is moved away from normal.
lar manner as for bar II. At the next impulse,
2. In a crossbar switch, a plurality of parallel
bar 2| is restored and bar 23 is operated by pin
bars each having a normal position, mechanism
3. and arm 22 and so on. On the sixth impulse
common to said bars operated to engage and move
arm I9 is again rocked, but this time by pin 6
any desired one of said bars to either one of two
in the opposite direction to its operation by pin I.
oif-norm'al positions, a plurality of parallel bars
This rotates arm I! in the opposite direction to
arranged in a direction transverse to said ?rst
put the operating ?ngers into engagement with
bars, each of said last bars having a normal posi
the other set of springs associated with arm II.
tion, means for moving any desired one of said
Similarly the seventh, eighth impulse and so on
last bars to an off-normal position, a plurality
respectively cause pins 1, B and so on to operate
of contacts sets, and means whereby one of said
bars 2|, 23, etc.
sets is operated by the movement of one of said
At the end of the digit dialled the appropriate 45 bars to an off-normal position whenever such
pin on shaft I1 is in engagement with its appro
movement occurs at a time when any non
priate arm and the appropriate horizontal bar is
parallel one of said bars already occupies an
nated 24 and 25, the corresponding spring ?nger
off-normal position.
therefore operated in the correct direction so as
to prepare all circuits in the level required for
3. In a crossbar switch, lateral bars and longi
the selection of an outlet. When this is chosen 50 tudinal bars so arranged that each lateral bar
the‘ associated vertical magnet operates and
operates the correct spring set.
The uniselector thereupon homes and the shaft
I‘! thereupon restores to its normal condition for
another call.
jections for each lateral bar, means for rotating
. It will be understood that the wipers and banks
said select rod to cause one or the other of any
intersects all of said longitudinal bars, each of
said bars having a normal position, electrical con
tacts at each intersection of said bars, a select rod
having helically arranged projections, two pro
of the uniselector may still be used for other
functions as required.
pair of projections to act on a corresponding
lateral bar, thereby to displace said bar in one
The invention may be applied for instance to
direction or the other from its normal position,
the group selector described in our application 60 means for displacing any one of the longitudinal
Serial No. 512,888, ?led Dec. 4, 1943. It would
bars from its normal position, and means respon
necessitate the control equipment being individual
sive to the displacement of said lateral bar fol
to the group selector which is usually the case
lowed by the displacement of said longitudinal
and would in the case of the crossbar switch
bar for operating a corresponding set of contacts
whose preparatory operation is‘ determined by the
received impulses eliminate the wiper which se
lects the prepare magnet for such switch as well
of course as the prepare magnets themselves.
at the intersection of said bars.
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