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Dec. 24, 1946.
2,413,110
|_. v. LEWIS
COUNTING RELAY SIGNALING APPARATUS
Filed Nov. 18, 1944
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ATTORNEY.
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Dec. 24, 1946.
L. V. LEWIS
2,413,110
I‘
COUNTING RELAY SIGNALING APPARATUS
Filed Nov. 18, 1944
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“INVENTOR
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BY
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H15’ ATTORNEY
I
Patented Dec. 24, 1946
2,413,110
UNITED ‘STATES PATIENT OFFICE
2,413,110
COUNTING RELAY‘SIGNALING APPARATUS
Lloyd V.'Lewis, Pittsburgh, -Pa., lassignor to The
Union Switch & Signal Company, .Swissvale,
Pa., a corporation of Pennsylvania
Application November18, 1944, Serial No. 564,045
'10 Claims.
3
My invention relates to signaling apparatus, and
more particularly to a system of relays for count
(Cl. .177-.—380)
2
by operating a switch IG, or until switch 2G is
operated to open the line circuit. Forthe infor
mationofthecentral of?ce operator, a miniature
ing diiierent numbers of impulses. In its speci?c
embodiment as shown, my invention is employed
in control apparatus for yard track indicators for
railroads for selectively lighting oneof a plu
rality of numbered signal lamps for informing
indicator :28 may be provided containing indica
tion lamps corresponding to those of the yard
indicator is and lighted by a similar control unit
Letters Patent of the United States No. 1,972,941,
issued September 11, 1934.
Fig. 1.
A feature of my invention is the provision of
an improved relay chain in which the relays are
system of Fig. 1, in which the impulses for select
ing the yard indicator lamps are generated by
ECU governed by a line relay ZLR in series with
trainmen on which of a plurality of. yard tracks
relay ILR.
to place their train, and is an improvement upon
Fig.2 shows the circuits in detail for the con
the apparatus for that purpose disclosed in my 10 trol unit iCU or ZCU as used in the system ofv
Fig. 3 shows a modi?cation of the signaling
operated one at a time in order in response to a 15
the operation of a transmitter relay T controlled
series of impulses, without the use of auxiliary
by‘the o?ice ‘control unit ZCU, under the control
of a group of individual keys KI-Kiil by which
the different lamps are selected. In this form
Another feature of my invention is the provi
the
‘switches 2G and L and the miniature indi~
sion of a system of relays of this character which 20 cator
QS-arenot used, the position of the operated
or halfstep relays or the like as required hereto~
fore, thereby decreasing the number of relays.
is self checking, characterized by the provision
of a temporary holding circuit for the relays so
key K-indicating which lamp is lighted.
Fig. .4 shows the circuits in detail vfor a control
arranged that any counting relay which fails to
unit similar to that of Fig. 2 but including the
respond to its assigned impulse is rendered in
capable of responding to any succeeding impulse. 25 circuits for controlling the transmitter relay T
by thekeys‘Kl—-Klll, which "circuits are substi
A further feature of my invention is the pro
tuted for=those by which the indicator lamps are
vision of novel means by which a system of relays
controlled in Fig. 2. It will be understood ‘that
of the type described is adapted to generate the
the ‘control units'may be used interchangeably as
impulses by which the relays are controlled and
in which the impulses generated by one chain of 30 a transmitter controlled by a group of keys as in
Fig. '4, was a receiver to control a group of lamps
relays operates another similar chain .of relays
as in Fig. v2.
located at a distant point.
'
I shall describe one form of apparatus embody
ing my invention and a modi?cation thereof, and
shall then point out the novel features thereof
in claims.
Similar reference characters refer to similar
parts in each of the‘ views.
:Referring to Fig. 2, it will be seen that the
controleunit comprises a group of relays controlled
by the line relay 'LR, all of which are normally
deenergized. These include two'slow release re
laysLC‘aandLO‘energized when the line is closed
and open respectivelyyand remain picked up dur
indicator IS over a pair of line wires Y and Z, 40
ingithe periodic operation of relay LR, a chain
from a central office or tower. The yard indi~
of counting relays :R.|_R|9 which pick up one
cator IS may be located adjacent the entrance
at
a time in order, thereby registering one to ten
to a series of yard tracks like the similar device
interruptions,
respectively, of the line circuit, a
S of my prior patent and includes a series of
twenty numbered lamps which are selectively 45 chain repeat relay CR‘which is picked up by relay
RM -.to condition the counting relays RI—R9 to
lighted by the operation of a control unit .ICU
operate through-a second cycle to register nine
controlled by a line relay ILR. To light any one
additional interruptions of the line circuit, and
of the indicator lamps, the operatcr?rst closes
a counting vrelay R20 which operates in place-of
a switch 2G to energize relay ILR, and then op
erates a dial switch to interrupt the line vcircuit 50 relay RID to register the twentieth ‘interruption
and,is;als_o operated when the line circuit is ?rst
a number of times corresponding to thenumber
closed 'to render relay RI responsive to the ?rst
which he desires to display. The lamp which
of aseries of interruptions.
illuminates the selected number becomes lighted
Referring now to ‘Fig. 1, it is to be understood
when the interruptions cease and remains lighted
until the signal is acknowledged by the trainman 55 that the :device L is an ordinary telephone dial
switch except that the number 10 replaces the
Referring to the accompanying drawings, Fig. 1
shows one form of signaling system embodying
my invention as applied to the control of a yard
2,413,110
zero that ordinarily appears in the last position
of the dial, as illustrated in my prior patent,
so that any of the numbers 1 to 10 may be
selected by a single operation of the dial. The
4
gization of lamp I, the circuit for which other
wise would be completed at front contact d
of relay RI.
When relay LR picks up, following the ?rst
line interruption, the energizing circuit for relay
LC is closed again, relay L0 is held picked up
by the flow of current through its winding and
numbers 11-20 are selected by ?rst dialing 10
and then dialing the second digit of the number.
In apparatus of this character it is convenient
recti?er 24, andrelay RI is held picked up over
to light the lamps by alternating current by
a ?rst stick ‘circuit including its own front con
connections to terminals BX and CK of the
tact a and back contact 0 of relay R2, which
local alternating current supply and to obtain 10 is similar to the ?rst stick circuit for relay R20
direct current for energizing the relays from a
already traced. The second stick circuit for
recti?er energized from the same source, as shown _
relay R20 is opened when relay LR picks up, and
in my prior patent. In the present application, _ relay R20 then releases quickly because this cir
to simplify the drawings only the terminals of
cuit includes the resistor 23 by which the ener
the direct current source are shown, these being
gization of relay R20 has been reduced to a
designated by the reference characters B and
value slightly above its release point, and the
C, respectively. Furthermore, it is desirable to
circuit furthermore includes no recti?er for re
indicate to the operator when power is avail
tarding its release.
able for lighting the lamps of the indicator IS
When relay LR releases in response to the
in the yard, and this is accomplished by obtain 20 second
interruption, the energizing circuit for
ing the current for energizing the line circuit
relay L0 is closed again, and relay R2 picks up
from terminals B and C of the source in the
over the circuit from terminal B at back con
yard, as shown in Fig. l, and by providing a
tact a of relay LR, front contact b of relay LC,
lamp E at the office which becomes lighted when
contacts d of relays RIO and R20, front
relay 2LR is energized by current from the dis 25 back
contact b of relay RI through relay R2 to ter
tant source, in response to the closing of switch
minal C. Contact 0 of relay R2 disconnects
2G.
relay RI from recti?er 22 by which it is held
The mode of operation of the control unit of
energized
while relay R2 is picking up, and com
Fig. 2 will now be described assuming ?rst that
pletes the second stick circuit for relay RI which
the operator closes switch 2G to energize the
includes resistor 23.
line relay ‘LR, corresponding to relays ILR and
When relay LR picks up following the second
2LR of Fig. 1.
interruption, relay RI releases quickly, due to
When relay LR picks up, it closes a circuit
the opening of its second stick circuit, and if
for relay R20 extending from terminal B at front
there are no further line interruptions, relay LO
contact a of relay ILR over back contacts a,
releases, completing a circuit from terminal BX
b and h, respectively, of relays LC, L0 and RIO,
at its contact a over back contact d of relay CR
through relay R20 to terminal C. Relay R20
and front contact (1 of relay R2 through lamp 2
picks up, completing a pick-up circuit at its
to
terminal CX thereby lighting lamp 2 to dis—
contact 9 for relay LC, which relay then picks
up to establish a stick circuit at its own front 40' play the corresponding number in the yard in
dicator IS, and also lighting the corresponding
contact a and to open the pick-up circuit for
lamp in the miniature indicator 2S at the of
relay R20, while completing a ?rst stick circuit
?ce.
for that relay which extends from terminal B at
It will be clear from the foregoing that when’
contact 0 of relay LC over front contact b of
relay LR picks up after a number of line inter
relay LR, back contact 0 of relay RI and the
ruptions, the last operated counting relay, Which
front contact a and winding of relay R20 to
registers the number, is held energized over its
terminal C. The closing of contact‘ 6 of relay
?rst stick circuit as long as relay LR remains
LC of the o?ice control unit-causes lamp E to
picked up, but the preceding ‘relay releases
become lighted.
I shall now assume that the operator dials 50 quickly, due to the opening of its second stick
circuit, leaving only one counting relay ener
the number two, for example, operating the dial
gized when relay LR releases, the release of the
switch L so as to interrupt the line circuit twice.
last operated relay is retarded by recti?er 22
In response to the ?rst interruption, the en
only long enough to effect the energization of
ergizing circuits for relays LC and R20 are
opened by the release of relay LR, but current ill the next relay and it consequently releases if the
next relay fails to pick up, which prevents the
continues to ?ow through the windings of these
operation of the latter relay in response to any
relays to hold them picked up temporarily due
subsequent interruption of the line in case it
to the connection of recti?ers 2I and 22 across
fails to respond to the one to which it is as
their terminals, and the pick-up circuit for relay
RI is closed, which circuit extends from terminal 60 signed.
In normal operation, however, a counting re
lay picks up in response to each release of re
B at back contact a of relay LR over front con
tact b of relay LC, back contacts b of relays
R0 and R9, back contact 0 of relay CR, and
front contact b of relay R20 through relay Rl
to terminal C. Relay RI picks up, and its con
tact c disconnects recti?er 22 from the winding
of relay R20 and closes a second stick circuit
for relay R20 which extends from terminal B
at contact c of relay LC over back contact 12
of relay LR, resistor 23, front contact 0 of relay
RI, and the front contact a and winding of
relay R20 to terminal C. At the same time,
relay LO picks up over back contact a of relay
LR and front contact b- of relay LC and by
opening its back contact a prevents the ener
lay LR and establishes the second stick circuit
for the preceding relay to hold it energized. Each
' relay thereby holds its own pick-up circuit closed,
since this circuit includes the front contact b
of the preceding relay, and at the same time it
holds the pick-up circuit for the next succeeding
relay open, which circuit includes its own front
contact b and the back contact b of the preced
ing relay.
Assuming now that the line circuit is opened
by the operation of switch IG or 2G after lamp
2 has been lighted as above described, relays R3
75 '
and LO will become energized, the operation of
$1
2313;110:
relay» LO,‘ extinguishing. lamp. ‘ 2 and. . relay. LC F is
deenergiz'ed? and releases and inturn releases re->
lays1<R2(£and'-R3, and at‘the of?ce', extinguishes
lamp" E; The:- indication displayed by the yard‘
indicator may-thus be cancelled, and lampE ex
tinguis'hed to inform the operator‘ by theopen
ing of “switch lG by the train crew ‘for a suitable
time interval, whereupon the‘ operator- will open
switch 2G to restore the apparatus tonormal,
if inokf'u-rther operations are required.v
" Assuming-now that switch 2G is closed again‘.
and? the number tenis dialed, relays Rl to RIB
will'be- operated successively in response to the
ten- interruptions in the manner described; and
when :relayRllr picks up it closes a circuit at
its‘ front' contact g to pick up relay CR, which
relay- then completes a stick circuit at its con
tactia‘extending to terminal B at contact 0 of
relay LC. Relay CR prepares a circuit at its con
tact (d7 for lamp Ill, and at its contact 0 pre
paresa circuit rendering relay Rl responsive to
thee'nextiline‘interruption so that the relay chain
may -be Operated through a second cycle by dial
ing the second digit of- the numbers 11 to 20.
In response to- the 20th line interruption, relay
R20 picks up in place of relay RIO, over front
contacts 1)‘ of relays R9 and CR and back con
61”
relay 'R20.‘is-iheldrenergizedlovm its secondlsticlré
circuitlby relayzRiliasalreadyrdescribed,ia:pick4up1
circuitifori-relay'T; is closed‘ from'it'e‘rminal B'Sati
thi'e'lkey contact? bi over‘ from cont'a'ct's'*1fi of vre‘
"1 lays'R'i' and? R29; Relay T'thereforeapicksupi"
again reenergizing relayi’LR; which causeslre‘e'
layfR20' to‘ release;- and inturn, to‘ release‘ relay
T to cause a second intermption of the linei‘cire
cult;
‘
In? response: to: the second"; interruption; - relay
LR‘ releases, energizing 'relay R2: and: sin'ceirelayif
RI remains picked up; ai-new pick=upicircuit5 for
relayT isiclosedyover ‘contacts ‘f 'ofl‘relays 1RI "and."
R2,. so .tha'tirelay-T picksiupitolclose thelin‘e-icir; ~
cult‘ to again, energizeirelay LR'.'_ Although relay?
LR releases ‘relayiRl ' to: open the pick-up circuit‘
for relay T, nofurther interruptionsroccur'be-I
cause, when relay/T. becomes energized following:
the second line . interruption-u it i establishes3 a? stick 1
' circuit‘ at iitsi'contact‘v at; which eXten'ds'over. back;
contact'd'of relay. (JR-and front.contact§dioflrrelay-I
R2‘. to- terminal B at lthe- left-hand -> contact a1 of?
the operated? key K2.l- Relay-LO thereforeiree
leases, the release of relayLO'in-v the?‘ station:
control unit'lightingelampi 2”.‘ i
It. .will be: clear; from. the foregoing'thatsince
each of; the.‘ successive. interruptions lot the line:
t‘act‘h of relay R! B.
circuit 1; results: in‘ the energization of ‘a counting.
It'lwill beseen that relay R3 will not respond
relay
"over the ‘frontvicontact-bi of the-nextipre'ced;
tor-the impulse by Which relay R20 is energized 30
ing. relay‘,v theilclosing o1’ the'circui'tlover the~.-fronti
because its pick-up circuit includes back contact
contacts 1‘ of . these: .two- counting“: relays ‘indicates :
0‘ of ‘relay CR which is now open. It will also be
seen that each of the counting relays except re
lay R'IO may be operated twice, but lamp 26 is
lighted only in response‘ to the second operation
of‘relay RZU- occurring when twenty ‘interrup
tions have been received.
that: thevv operations. occurring during the'lin‘e"
open period have been completediand thus occurs,
atthe'. proper time‘ for energizing relay T to ter
' minate the interruption. On the .tenth interrup~~
tion,. the operation?of an addition‘ali.-relay' CRzis
required, and‘ accordingly a. front. contact". if of
relay: CR-is included in thecircuit iinwserieswith:
contacts 1" off relays5R91 and'R I 0 :by- which‘ that.
unit'is caused ‘to generate the line interruptions 40 interruption: is‘. terminated;- .It will alsobeeclear
by‘WhiCh it viscontrolled as above described; in
that the operations occurring, duringfthe'interr
this form of the apparatus a group of ten three
mediate 1 line 'closed :periods are completed. when
position keys Kl-Kltl are provided, each of
there‘is only one counting relay picked up, fol
which has a contact a which when moved to
lowingv the release- of the preceding... relay, and
the’leftprepares a circuit for selecting the cor
Referring now to Fig. 4, and more particularly
to- the transmitter relay T by which the control
respondingly numbered lamp‘ I to It of Fig. 2,‘
and-‘when moved to the right prepares a circuit
for “selecting the corresponding lamp in the sec
and group H—-20. Each key K has a second con
the‘ openingzof; contact 1‘ of the preceding‘relay
occurs'vat the "proper timevfor initiating ‘the next
interruption‘by ‘releasing. relay T, provided the
stick circuit: including/the keyv contact‘ a' and the
front‘ cont-act d or‘ e of the energized counting
tact'fb, of which for simplicity but one is shown 50" relayis open.
at thelleft of the group of- keys, by which relay
- When the operated. key such as the key‘ K2 is
T'isv'maintained' in operation to transmit the
restored
toi‘its' normal position, relayiT releases
number of impulses needed to establish a hold
opening the line circuit and restoring the ap
ing circuit for relay T over contact a of the op
paratus to itsnormal condition.
erated key." A‘ starting push button ST may also 55
If.switchi IG is provided, as shown in Fig. 3,
be-used, but for the present it Will be assumed
‘the closing of thisvswitch after it has been opened
that 5this is cut out of circuit by a connector 25.
long enough to release relays LC and LO would
I shall- ‘assume that the operator desires to light
complete the ?rst pick-up circuit for relay T,
lamp '2," as in the preceding example, and so
which
includes the back contacts d of these re
moves key K2 to the left closing a pick-up cir 60
lays, so‘ thatv the‘ apparatus would be set' into
cuit for‘relay T from terminal B at the key con
operation'upon the closing of'switch I G to light.
tact I) over back contacts d of relays L0 and
lamp'2
again; provided contacts a and b of key
LC through relay T to terminal C. Relay T picks
K2 remain closed. To avoid this, if switch K3 is
up; closing the line circuit of Fig. 3 at its con
used,‘ the‘ connector-?ns removed so as to in
tact‘ b‘; energizing the line relay LR of the as
clude the contact of the push button ST in the
sociated control unit and also that of‘the sta
?rst pick-‘up circuit for relay T. With this modi
tion control unit, the latter having the lamps
?cation the'momentary operation of the starting
of‘the yard indicator IS connected to the count
button ST in addition'to the operation of a keyK
ing: relay contacts (1 and e in place Of the keys,
is required to initiate the operation .of the ap
asrin Fig. 2.
'
70; paratus, and the‘operation of switch I G, which
Relays R29 and LC pickup as described in
by releasing relay LC opens .all of the circuits for
connection with Fig. 2,v and relay-LG‘ opens the
circuitror' relay T which therefore releases to
relay T except‘ the 'one'controlled by button ST,
lnterruptthe. line circuit, releasing relay LR, - is su?icient by itself‘to restore the apparatustto'
whereupon'relays
and‘Rl pick up; and-since“ 75:
normal.’
,
,
Although I ‘ have "herein shownv and described
2,413,110
7
but one form of apparatus embodying my inven
tlon and one modi?cation thereof,- it is under
stood that various changes and modi?cations
may be made therein within the scope of the ap
pended claims without departing from the spirit
8
' '5.‘ In a signaling system, a two position line re
lay, a slow release relay, a series of counting re
lays, an initiating circuit for temporarily ener
gizing one counting relay which also serves as the
last relay of the series, said circuit including a
front contact of the line relay and a back con
and scope of my invention.
tact of the slow release relay, a pick-up circuit
,Having thus described my invention, What I
for the slow release relay including front con
claim is:
tacts of the line relay and of said one relay, a
I. In a signaling system, a two position line
holding circuit for said one relay including its
relay responsive to a series of impulses, a chain 10 own front contact and a front contact of the line
of counting relays, pick-up circuits for a plurality
of said relays each including a front contact of
the next preceding counting relay, a back contact
of the second preceding counting relay of the
relay, and an energizing circuit for each counting
relay of the series including a back contact of
the line relay, that for the ?rst counting relay
including 'a front contact of said one relay and
series and a contact closed by the line relay in 15 that for each remaining relay of the series in
one position, a ?rst stick circuit for each such
cluding a front contact of the next preceding re
counting relay including its own front contact,
lay whereby said relays are energized succes
a back contact of the next succeeding counting
sively, one for each operation of the line relay,
relay and a contact closed by the line relay in its
said one relay being the last to be energized.
20
other position, and a second stick circuit for each
6. In a signaling system, a two position line
such counting relay including its own front, con
relay, a chain of counting relays, pick-up and
tact, a front contact of the next succeeding
stick circuits for a plurality of said relays each
counting relay and a contact closed by the line
including a contact closed by the line relay in
relay in said one position.
one
position, the pick-up circuit for each relay
two position line ~
2. In a signaling system, a
including a front contact of the last preceding re
relay responsive to a series of impulses, a chain
lay operated, said stick circuit for each such relay
of counting relays including one for each impulse,
including a front contact of the next relay to be
pick-up and stick circuits for a plurality of said
operated, another stick circuit for each such relay
relays each including a contact closed by'the
including a back contact of the next relay to be
30
line relay in one position, the pick-up circuit for
operated and a contact of the line relay closed
each relay including a_ front contact of the next
in its other position, a transmitter relay effective
preceding relay whereby each relay prepares a
When energized to operate the line relay to said
circuit for the next relay to be operated, said
other position, and a series of circuits for repeat
stick circuit for each relay. including a front con
edly energizing said transmitter relay each of
tact of the next relay to be operated whereby each
relay when operated holds the circuit prepared
by the preceding relay closed until the line relay
which includes front contacts of the last operated
counting relay and of the next preceding relay
of the series.
7. In a signaling system, a two position line
relay,
a chain of counting relays, pick-up and
of the next relay to be operated and a contact 40 stick circuits for a plurality of said relays each
closed by the line relay in its other position only.
including a contact closed by the line relay in
3. In a signaling system, a twoposition line
one position, the pick-up circuit for each relay
relay, a chain of counting relays, pick-up circuits
including a front contact of the last preceding
for a plurality of said relays each closed by the
relay operated, said stick circuit for each such
line relay in one position each such circuit in
relay including a front contact of the next relay
cluding - a front contact of the last preceding
to be operated. another stick circuit for each such
counting relay to be operated and 'a back contact.
relay including a back contact of the next relay
of the second preceding counting relay of the
to be operated and a contact of the line relay
series, a ?rst stick circuit for each such counting 50 closed in its other position, a transmitter relay
relay closed by the line relay in its other position
effective when energized to operate the line relay
and including a back contact of the next counting
to said other position, a series of circuits for re
relay to be operated, and a second stick circuit for
peatedly energizing said transmitter relay each of
each such relay closed by the next succeedingv re
which includes front contacts of the last operated
lay when such relay is operated by the line relay
counting relay and of the next preceding count
in said one position and opened by the line relay
ing relay, a series of manually operable keys in
when it next assumes its other position. "
cluding one for each counting relay, and a series
4. In a signaling system, a two position line
of circuits including a front contact of said trans
relay responsive to a series of impulses, a chain
mitter relay for holding it steadily energized,
of counting relays including one for each of a
each of, which also includes a contact of a differ
60
plurality of said impulses, a pick-up circuit for
ent one of said keys and a front contact of the
each such relay including a contact closed by the
corresponding counting relay,
line relay in one position and also including a
8. In a signaling system, a two position line
front contact of the next preceding counting re
relay, a chain of counting relays, a slow release
lay, a ?rst stick circuit for each counting relay
relay, an initiating circuit for energizing one
closed upon the operation of the line relay to its
counting relay which includes a back contact of
other position following the energization of such
the slow release relay and a front contact of the
counting relay, a second stick circuit for ‘each
line relay, a pick-up circuit for the slow release
counting relay closed upon the next operation of
relay including a front contact of said one relay,
said line relay to said one position only if the next;
succeeding counting relay becomes energized, and 70 means for maintaining said slow release relay
picked up as long as the line relay is repeatedly
means comprising electronic recti?ers connected
energized, pick-up circuits for said counting re
to said pick-up and first stick circuits to render
lays each including a back contact of the line
each relay slow to release upon the opening~ of wits
relay and a front contact of the last preceding
pick-up or ?rst stick circuit although quick to
release when its second stick circuit is opened. 7.5 counting relay to be operated, that for the first
is operated to its other position, and another stick
circuit for each relay including a back contact
2,413,110
10
relay of the series including a front contact of
10. In a signaling system, a two position line
said one relay, and those for the remaining re
relay, a chain of counting relays, a slOW release
lays of the series also including a back contact
relay, an initiating circuit for energizing one
of the second preceding relay operated, a ?rst
stick circuit for each counting relay including a CI counting relay which includes a back contact of
the slow release relay and a front contact of the
front contact of the line relay and a back con
line relay, a pick-up circuit for the slow release
tact of the next relay to be operated, and a sec
relay including a front contact of said one relay,
ond stick circuit for each counting relay in
means for maintaining said. slow release relay
cluding a back contact of the line relay and a
front contact of the next counting relay to be 10 picked up as long as the line relay is repeatedly
energized, pick up circuits for said counting re
operated.
lays each including a back contact of the line
9. In a signaling system, a two position line
relay and a front contact of the last preceding
relay, a chain of counting relays, a slow release
counting relay to be operated, that for the ?rst
relay, an initiating circuit for energizing one
counting relay which includes a back contact of 15 relay of the series including a front contact of
said one relay, and those for the remaining re
the slow release relay and a front contact of the
lays of the series also including a back contact
line relay, a pick-up circuit for the slow release
of the second preceding relay operated, a ?rst
relay including a front contact of said one relay,
stick circuit for each counting relay including a
means for maintaining said slow release relay
picked up as long as the line relay is repeatedly 20 front contact of the line relay and a back con
tact of the next relay to be operated, a second
energized, pick-up circuits for said counting re
stick circuit for each counting relay including a
lays each including a back contact of the line
back contact of the line relay and a front con
relay and a front contact of the last preceding
tact of the next counting relay to be operated, a
counting relay to be operated, that for the ?rst
transmitter relay effective when energized to en
relay of the series including a front contact of
ergize said line relay, a series of manually oper
said one relay, and those for the remaining re
able keys one for each counting relay, an ener
lays of the series also including a back contact
gizing circuit for said transmitter relay closed, in
of the second preceding relay operated, a ?rst
response to the operation of any one of said
stick circuit for each counting relay including a
front contact of the line relay and a back con 30 keys having a plurality of branches one including
a back contact of said slow release relay and the
tact of the next relay to be operated, a second
others including front contacts of the last oper
stick circuit for each counting relay including
ated counting relay and of the next preceding
a back contact of the line relay and a front con
relay, and a stick circuit for said transmitter re
tact of the next counting relay to be operated,
and means for repeatedly energizing said line
lay including its own front contact, a contact of
the operated key and a front contact of the
relay to effect the successive operation of said
corresponding counting relay.
counting relays, comprising a circuit having a
plurality of different branches each including
front contacts of the last operated counting relay
and of the next preceding counting relay.
LLOYD V. LEWIS.
40
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