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Патент USA US2354668

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Aug. 1, 1944.
2,354,668
s. DEAKIN ETAL
ELECTRIC SELECTION CONTROLLING CIRCUIT
Filed lay 6, 1943
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G. DEAKlN EI'AL
ELECTRIC SELECTION CONTROLLING CIRCUIT
Filed May 6, 1943
2 Sheets-Sheet 2
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Patented Aug. 1, 1944
2,354,668
UNITED STATES PATENT OFFICE
2,354,888
ELECTRIC SELECTION GONTROIJJNG
CIRCUIT
'
Gerald pm, New York, N. 1., in am r.
Herbig, Madison, N. J., alslgnors to Interna
tional Standard Electric Corporation, New
York. N. 1, a corporation of Delaware
Application May 6, 1948, Serial No. 485,880
9 Cialms. (Cl. 179-18)
ground from the test brush T or the selector 3
This invention relates to new anduselul im
and closes an energizing circuit for the power
movements in selection controlling circuits and
magnet P in parallel with its winding. The se
more particularly to circuits for controlling the
lector will start hunting for a terminal which has
numerical selecting operation oiselector switches
the same potential applied to it as that applied to
employed in automatic telephone exchange sys
the terminal on which the register brush RB is
tems.
resting.
) The present invention is an improvement on the
Before the relay AR becomes energized the
ground at the armature was connected over re—
plication of Gerald Deakin, Serial No. 484,184,
?led April 23, 1943, and the various applications 10 sistances R8 and R5 in a network B oi‘ the Wheat
stone bridge type which is provided in the reg
and patents referred to therein.
ister, and in multiple through the resistance RI
The invention will be explained withv reference
and recti?er‘ S4, to brush RB and thence to
to Figs. 1 and 2 of the drawings which diagram
negative battery and ground. This makes the left '
matically illustrate two modi?cations oi as much
of a control system as is necessary for a clear 15 corner of the bridge B negative with respect to the
control circuits disclosed in the co-pending ap
understanding of the various features of the pres- _
right corner and consequently the grid of a tube
ent invention.
Vi negative with respect to the cathode of this
tube which is connected to the right corner of the
bridge. This is the case when the brush RE is
In an automatic telephone system calling and
called subscribers’ stations I and 2 (Fig. 1) may be
interconnected by means including a. plurality of 20 resting on one oi the ?rst ?ve terminals which are
connected to the negative pole,oi' the battery.
selector switches such as 3 and l. The numerical
When the register brush is resting on the second
operations of the selectors are controlled by the
group of live terminals of the register switch it will
calling subscriber’s customary impulse sender or
connect the positive pole of the battery through
other number indicating device through the
agency of a register provided at the central ex 2.5 resistance R5, resistance R6, and in multiple
through resistance RI and recti?er S2, to ground
change. The calling station I is connected to the
over the back contact of relay AR. In this case
brushes of selector 3 by non-numerical switches
(not shown) and a connecting circuit 6, and the
also the left-hand comer of. the bridge will be
register is attached to the connecting circuit 6
negative with respect to the sight-hand corner.
through switching means I.
As the brushes oi selector 3 advance and the
The selector switches are of the customary type
test brush '1‘ makes contact withlthe successive
having a bank of terminals with which a set of
terminals, current ?ows from theeregister brush
brushes cooperates. In the drawings three brushes
RB to the selector brush ‘1' or vice versa, depend
are shown for selector 3, although it may have a
ing upon the relative polarity of the register and
larger number of brushes. The selector brushes
selector terminals. However, the leitrhand cor
ner of bridge B~and, therefore, the grid of VI will
‘are moved over the terminals while a magnet P is
energized and are stopped on a set of terminals
always remain appreciably negative with respect
when this magnet becomes die-energized,
‘ to the right-hand corner 01' the bridge and cathode
The register comprises a series of switches suc
of VI until the same potential is applied to both
cessively operable by the calling ‘device in ac 40 brushes.
cordance with the successive digits of the called
When the relay RSR became energized, high
number which are dialed by the calling sub
tension battery HTB was connected over, its left
scriber. A brush and a set of terminals of one
of these register switches is shown in Fig. 1. This
hand armature and front contact and a resistance
R2 to the anode of vacuum tube Vi. Through a
is the register switch which responds to the digit 45 condenser Cl the high tension battery is con
destined for selector 3. When brush RB is ad
nected with the grid of a second vacuuintube V2.
vanced towards one of its ten terminals in ac
but this grid is maintained negative by a battery
cordance with the operation of the calling device
at station i, the register starting relay RSR hav
ing been energized in the customary manner, a
circuit is closed from ground over the armature
and back contact of a register relay VR, the right
hand armature and front contact of RSR and the
winding of selector relay AR to grounded battery.
The relay AR becomes energized, removes the
connection over resistance R8.
" /
When the brush T of the selector reaches a
50
terminal having the same potential and polarity
as the terminal on which BB is resting, then ap
proximately the same potential will be'applied, to
the cathode and the grid of tube VI. The char
acteristic of VI is such that it triggers off and
closes the anode circuit under these conditions.
2
ass-mes
register brushes are resting on the highest nega
tive potential, in the present case 20 volts, then
the effective potential of the high tension HTB
is augmented. On the other hand,.when the
so, whereupon V2 also triggers oil and operates
brushes are resting on the highest positive po
the high speed relayVR. This relay opens the
tential, then the effective potential of HTB is
selector magnet circuit and the selector stops.
decreased. Obviously, the potential of HTB must
The anode circuit of tube Vi may be traced
compensate for this drop.
from the high tension battery HTB, the front
In the arrangement disclosed in Fig. 2, two
contact of RSR, the resistance R2, the anode of
Vi, the cathode of VI, the positive corner of 10 pairs of recti?ers, Si, 82 and S8, 84 are used.
Each pair is oppositely polarized and the recti?er
the recti?er bridge, resistances R5 and R8 in
pairs provide alternate parallel paths between
multiple and then over the brushes RB and T,
the register brush RB and the selector brush T.
respectively, to grounded positive or negative
The grid of a triode Vi is connected with one
battery. A small amount of current passes
path between the two recti?ers and the cathode
through RI and thence in multiple through recti
with the other path, also between the two recti
?ers S2 and S4 to the two brushes RB and T.
?ers. The rectifiers are so poled that when any
However, since RI is shunted by R5 and R6, in
current ?ows from one brush to the ‘other, the
su?icient current will ?ow over this path to make
grid of tube Vi will be always negative and the
the control grid of VI su?iciently negative to
cathode of this tube always positive. Only when
stop emission in case high vacuum tubes are
When this happens, then the potential on the con
denser CI will drop su?lciently to cause the grid
of the second tube V! to become positive or nearly
used. Preferably gas ?lled tubes are used in this
circuit, because once such tubes are triggered
the brushes RB and T have the same polarity
and are at the same potential will the cathode
corner until the brushes RB and T have the same
indicated in dotted lines.
and grid of tube VI attain the same potential
into action the return of the grid to negative
and cause the operation of the second vacuum
potential does not stop or even decrease emission
and the relay VB. is thus always assured of 25 tube V2. In all other respects the circuits of Figs.
1 and 2 are identical.
ample current for operation.
Since recti?ers have very high resistance to
The resistors Rl to R6 are oi fairly high re
currents ?owing in one‘ direction, the only appre
sistance and not enough current will ?ow over
ciable current that flows during hunting is
the test Wire during hunting to produce cross
high resistance R4 to ground. This will
30 through
talk
guard against cross-talk. Should the flow of
When the high tension battery is connected
current over the test wire to R4 be found ob
over the front contact of relay RSR the bridge
jectionable, this may be completely eliminated
circuit must be kept continuously closed so that
by connecting the resistance R4 to the brush T
the left-hand corner of the bridge may be al
ways negative with respect to the right-hand 35 not at the register but at the selector. This is
potential and polarity. This is accomplished on
the selector side of the bridge by applying ground
‘
While in Fig. 1 the terminals are shown as
separated by four volt steps the circuit of Fig. 1
as well as Fig. 2 will operate on two volt steps
?rst over the back contact of the AR relay and
then over the resistance R4. The path to the 40 or, of course, on larger steps than four volts.
If the recti?er S4 is shunted by a resistance‘
bridge will never be opened when the brush T
then the tube Vi may be used to operate relay
passes from one terminal vto the next. As ex
V'R directly rather than through the agency of
a'second tube V2. Such arrangement might be
Gerald Deakin, the selector brushes are usually
set in motion before the register brush RB comes 45 objected to on the ground that appreciable cur
rent would ?ow over such shunting resistance
to rest. To guard against improper operation,
when RB is positive with respect to brush T thus
the register brush is wide enough to bridge adja
producing objectionable cross-talk.
‘
cent terminals and it must always be one or two
plained in the above-mentioned application of
Since the potential of the grid does ‘not change
steps ahead of the selector brush T. The selector
hunts at six to ten times the speed of the register. 50 with respect to the cathode when Vi emits full
current, the two tubes VI and V2 may be of the
Of course, in the selector bridging brushes are
not ‘permissible because the test terminals are
high vacuum type. However, gas ?lled triodes
are preferred, certainly for tube V2.
multipled and a false test would occur if the
brush made contact with one terminal while
What is claimed is:
still in engagement with the receiving terminal. 55
i. In combination, a selector switch having a
The grounding of the test wire over resistance
plurality oi’ ?rst contacts and a second cooperat
R4 compensates for that. ‘
ing contact, a magnet for controlling the con
The cathode of vacuum tube VI must always
tacting of the second with any of the first coni
tacts, a register having a plurality of ?rst con
be free from ground. This may be accomplished
by using ?oating or indirectly heated cathodes 60 tacts and a second contact, means for controlling
or, as shown, by heating the ?lament cathodes
of ‘each tube over a small individual transformer
T. The primary circuits of each tube’ trans
the engagement between the ?rst and second reg- '
ister contacts, a relay for ‘said register having a
contact for controlling the magnet, a vacuum
tube in said register having a cathode, a grid and ’
former T are connected with a 60 cycle power
supply over the front‘ contacts of a relay SR 65 an anode, a source of potential, connections for
applying the same potentials to the that contacts
01' the register and selector, there being. a prede
termined difference between the potentials ap
plied to adjacent ?rst contacts, an energizing
?laments may be heated (mm a D. C. source by
inserting recti?ers in the secondary circuits of 70 circuit for said relay controlled by said vacuum
tube, a circuit connecting the second contacts
the individual transformers T or by providing
of the register and selector, and connections from
individual batteries.‘ Such method of heating
the last-mentioned circuit to the grid and cathode
?laments may be found expedient in small in
of said tube.
.
‘
stallations where A. 0. power is not available.
2. In combination, a selector switch having a
It will be noted that when the selector and 75
which operates when the register is selected for
connection with circuit 6. This will eliminate
all delay in the heating up of the ?lament. The
3
assaees
plurality of ?rst contacts and a second cooperat
ing- contact, a magnet i'or controllingvthe con
tacting o! the second with any of the ?rst con
contacts, a relay for said register having a con
tact for controlling the magnet, a vacuum tube
in said register having a cathode, a. grid and an
anode, a source of D. C. potential, connections for
taste, a register having a plurality oi’ ?rst contacts and a second contact, means for controlling
the engagement between the ?rst and second reg-l
ister contacts, a relay for said register having a
contact tor controlling the magnet, a vacuum tube
in said register having a cathode, a grid and an
anode, a source of potential, connections for ap
applying the same potentials to the ?rst contacts
of the register and selector, negative to one group
and positive to a' second grouppthere being a pre
determined voltage dii’ierence between the po
tentials applied to adjacent contacts, an ener
gizing circuit for said relay controlled by said
plying the same (potentials to the ?rst contacts
of the register and selector, there being-a prede
termined di?erence between the potentials ap
plied to adjacent ?rst contacts, an energizing cir
cuit for said relay controlled by said vacuum tube,
a circuit having alternate paths connecting the
second contacts or the register and selector, means
in said paths restricting current ?ow to a given
directiorna connection from the grid to one path
vacuum tube, a circuit connecting the second con
tacts o! the register and selector, a Wheatstone
bridge having its first and second corner con
nected in said circuit, and the third and fourth
15 corner, respectively with the grid and cathode of
said tube, resistances in two branches and recti-'
?ers in the other two branches of said bridge.
6. In combination, a, selector switch having a
plurality of first contacts and a second cooperat
contact, a magnet for controlling the con
’ ing
and a connection from the cathode to the other 20 tacting oi the second with any of the ?rst con
path.
'
.
-
3. In combination, a selector switch having a
tacts, a register having a plurality of first con
means for controlling
. tacts and a second contact,
plurality of ?rst contacts and a second cooperat
the‘engagement between the ?rst and second
ing contact, a magnet for controlling the contact
register contacts, a relay for said register having
25
ing of the second with any of the ?rst contacts,
a contact for controlling the magnet, a vacuum
a register having a plurality or ?rst contacts and
tube in said register having a cathode, a grid
a second contact, means for controlling the en
gagement between the ?rst and second register
and an anode, a. source of D. C. potential, con
nections for applying the same potentials to the
?rst contacts of the register and selector, nega
tive to one group and positive to a second group,
there being a predetermined voltage difference
between the potentials applied to adjacent con
applying the some positive potentials from said
tacts, an energizing circuit for said relay con
source to one group of the ?rst contacts of the
trolled by‘ said vacuum tube, a circuit having
register and ‘selector and the same negative po 35 parallel paths connecting the second contacts of
tentials to a second group of said contacts, there
the register and selector. two oppositely poled
being a predetermined voltage difference between
recti?ers, in each path, a connection from the
the negativeas well as the positive potentials ap
grid to one path between the two recti?ers, and
plied to adjacent ?rst contacts, an energizing cir 40 a connection from the cathode to the other path
cuit for said relay controlled over the anode of
between the two recti?ers provided therein.
said vacuum tube. a circuit having alternate paths
7. In combination, a selector switch having a
connecting the second contacts of the register and
plurality of terminals and a set of brushes co
selector, a recti?er at least in one of said paths
operating therewith, a magnet for controlling
restricting current ?ow to a, given direction, a
operation of said brushes, a register comprising
contacts, a relay for said register having a con
tact for controlling the magnet, a vacuum tube
in said register having a cathode, a grid and an
anode. a source of D. C. potential, connections for
‘- connection from the grid to one path and a con
nection from the cathode to the other path.
4. In combination, a selector switch having a
plurality of ?rst con acts and a second cooperat
ing contact, a magnet for controlling the contact
ing oi! the second with any of the ?rst contacts,
a register having a plurality of ?rst contacts and
a second contact, means for controlling the en
gagement between the ?rst and second register
contacts, a relay for said register having a con
tact for controlling the magnet, a ?rst and a sec
ond vacuum tube in said register, each having a
cathode, a grid and an anode, a source of poten
tial, connections for applying the same potentials
to the ?rst contacts of the register and selector,
there being ‘a predetermined di?erence. between
the potentials applied to adjacent ?rst contacts,
an energizing circuit for said relay controlled over
the anode of the second tube, a circuit connecting
the second contacts of the register and selector,
connections from the last-mentioned circuit to
the grid and cathode of the» ?rst tube, and a con
nection from the anode of the ?rst tube to the
grid of the second tube.
'
'
5. In combination, a selector switch having a
a switch having a plurality of terminals and a
brush adapted successively ‘ to engage them,
means for operating the register brush to engage
any terminal, a relay for said register having a
contact for controlling the magnet, two vacuum
tubes in said register each having a cathode, a
grid and an anode, a connection from the reg
ister brush to the selector brush including a ?rst
path in which current is allowed to ?ow in one
direction only. and a second path in which cur
rent is allowed to ilow only in the opposite direc
tion, a connection from the ?rst path to the grid
of the ?rst tube, a connection from the second
path to the cathode of the ?rst tube, a source of
potential, connections for applying the same po
tentials to the terminals of the register and of
the selector, there being a predetermined di?'er
ence between the potentials applied to adjacent
terminals, an energizing circuit for said relay in
cluding the anode of the second tube, and a con
nection from the grid of the second tube to the
anode of the ?rst tube.
8. In combination, a selector switch having a .
plurality of terminals and a set of brushes co
plurality of ?rst contacts and a second cooperat 0. operating therewith, a magnet for controlling
ing contact, amag'net for controlling the contact
operation of said brushes, a register comprising
ing of the second with any of the ?rst contacts,
a switch having a plurality of terminals and a
a registerhaving a plurality of ?rst contacts and
brush adapted successively to engage them,
means for operating the register brush to engage
a second contact, means for controlling the en-‘
gagement between the ?rst and second register
2,854,668
any terminal, a relay for said register having a
contact for controlling the magnet, two vacuum
tubes in said register each having a cathode, a
grid and an anode, a Wheatstone bridge having
recti?ers in two branches and resistances in the
other two branches. two opposite corners of
said bridge being connected, respectively, with
brush adapted succqlsively to engage them,
means for operating the register brush to engage
any terminal, a relay for said register having a
contact for controlling the magnet, two vacuum
tubesin said register‘each having a cathode, a
grid and an anode, a connection item the reg
ister brush to the selector brush including two
the register brush and the selector brush, and
parallel paths, two oppositely poled recti?ers in
the other two, respectively, with the grid and
cathode of the first tube. a source of D. C. poten 10 series in each path, a connection from the grid
01’ the first tube to the ?rst path between the
tial, connections for applying the same potentials
two recti?ers, a connection'from the cathode of
to the terminals of the register and of the se
the ?rst tube to the second path between the two
lector, negative to one group and positive to a
recti?ers, a source or D. 0. potential, connections
second group of said terminals, there being a
for applying the same potentials to the terminals
predetermined voltage di?erence between the po
of the register and o! the selector, negative to
tentials applied to adjacent terminals, an ener
one group and positive to 5 second group of said
gizing circuit for said relay including the anode
terminals, there being a predetermined voltage
of the second tube, and a connection from the
di?'erence between the potential applied to ad
grid of the second tube to the anode of the first
jaeent terminals, an energizing circuit for said
tube.
20 relay including the anode of the second tube,'and
9. In combination, a selector switch having a
a connection from the grid of the second tube
plurality of terminals and a set of brushes co
to the anode oi’ the ?rst tube.
operating therewith, a magnet for controlling
operation of said brushes, a register comprising
‘ GERALD DEAKIN.
a switch having a plurality oi’ terminals and a
HENRY F. HERBIG.
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