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Патент USA US2409052

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Qct. 8, 1946.
' 1.. v. LEWIS
2,409,051
REMOTE CONTROL SYSTEM
Filed Sept. 2, ‘1944
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2,409,051
L. v. LEWIS
REMOTE com'non SYSTEM
Filed sept. 2. 1944
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2,409,051
Patented Oct. 8, 1946
UNITED STATES PATENT OFFICE
2,409,051
REMOTE CONTROL QYSTEM
Lloyd V. Lewis,‘ Pittsburgh, Pa., assignor to The
Union Switch & Signal Company, Swissvale,
Pa., a corporation of Pennsylvania
-
Application September 2, 1944, Serial No. 552,504
12 Claims. (01. 177-—353),
1
My invention relates to remote control systems,
and more particularly, to centralized trai?c con
trol systems for railroads of the code type, and to
the line or communication circuits for such
systems.
2
necting the stations in systems of the character
described, which channel may if desired employ
the same carrier freouency for the transmission
of codes in both directions.
I shall describe several forms of apparatus em
bodying my invention, and shall then point out
Systems of this character, as illustrated, for
the novel features thereof in claims.
example, by the remote control system of my
Referring to the accompanying drawings, Fig. 1
United States Patent No. 2,229,249, issued Janu
illustrates a normally energized series connected
ary 21, 1941, employ a single communication
channel, comprising a pair of line wires extend 10 line circuit system similar to that shown in my
Patent No. 2 229.249, but which as shown herein
ing from the office through each station in turn,
is divided into two sections comprising the line
over which control codes are transmitted at times
circuits 1 and 2, respectively, connected by a
in one direction, from the o?ice to the stations,‘
repeater station including the apparatus of ‘my
while at other times indication codes are trans
mitted over the same channel in the opposite 15
Fig. 2 shows an alternative arrangement com
direction from the stations to the o?ice, each
prising a multiple connected line circuit system
transmitter having access to the line only when
like that shown in the system of my Patent No.
it is free. To prevent interference in the event
2.259.573. issued October 21, 1941, for remote con
transmission is started in both directions at the
same time, the ?rst step of each control code 20 trol systems, which is likewise divided into two
sections comprising the line circuits 3 and 4 con
delivered by the transmitter at the of?ce is made
nected by a repeater station as in Fig. 1. In this
relatively long in comparison with the ?rst step
view the codes are transmitted over line 3 vby
of an indication code delivered by a transmitter
carrier currents employing the same frequency for
at a ?eld station. When the transmitter at the
transmission in both directions.
o?ice and at a ?eld station both start to transmit
Fig. 3 shows a ‘modi?cation of the system of
at the same time, the long element delivered by
Fig. 2 in which the line circuit system is divided
the office transmitter overrules the short element
into three sections, one of which employs carrier
delivered by the station transmitter and suspends
current apparatus as in Fig. 2 but uses radio'in
its operation until the code delivered by the of?ce
place of line wires. In‘ this View the codes are
transmitter is completed, so that the two codes are
transmitted between lines 3 and 4 as radio sig
transmitted successively without interference.
nals employing the same carrier frequency fo
One object of my invention is the provision of
invention.
'
,
_
a two-way repeater for use in vsystems of I this
transmission in both directions.
character, for repeating the code signals from
‘Y Fig. 4 shows a modi?cation of the circuit for
‘
one line circuit or channel to another. in either
direction, which functions in such a manner that
a selector reply 2F of the o?ice coding unit of
Patent No. 2,229,249. for use in connection with
the direction of transmission through the repeater
is determined in accordance with the character
of the ?rst step of the received code.
A further object is the provision of a two-way
the repeater of my invention.
repeater for use in remote control systems in
which the central o?ice operator is able to re
verse the direction of transmission to break the
transmission of a code from a remote station.
The purpose of my invention is to permit the
line to be divided into sections energized by dif
ferent sources of current so as to enable the
distance between the of?ce and the stations to
be‘extended or to enable currents of different
character to be used for energizing diiferent sec- 7
tions, each section comprising a, single channel
arranged for two-way communication.
Another purpose of my invention is to enable
a carrier current or radio channel to be inter
posed between the of?ce and the line circuit con
'
Similar reference characters refer to similar
parts in each of the views.
The repeater apparatus shown herein is gen
erally similar in the different views. and it will be
described in detail in connection with Fig. 1. In
this view-it is to be understood that the terminal
apparatus is that of the remote control'system
of my Patent No. 2,229 249, only those portionsof
the system which are directly associated with the
line being shown herein. These portions include,
at each ?eld station, a master relay M, which
when energized places the station apparatus in
the transmitting condition, a transmitter relay T
which operates periodically when relay M is ener
gized to deliver its code to the line circuit, a line
relay R responsive to the codes supplied to the
line, and a coding unit CU comprising selecting
apparatus for ‘decoding the received codes and
2,409,051
3
4
which also controls the operation of the associ
ated transmitter relay T. The apparatus at the
control oi?ce is generally similar to that at the
mittent energization over its own front contact a
by relay RI on the odd-numbered code steps, and
releases when relay RI becomes steadily encr
gized at the end of the code, thereby restoring the
repeater to its normal condition as shown,
If the code is an indication code initiated by
relay T, and: relay OT is not operated, the ?rst
stations,.comprising a master relay OM, a trans
mitter relay OT and a line relay OR governing a
coding unit CU.
In addition, a push button PB
is provided by which relay OT may. be- steadily
‘energized for the purpose of breaking the trans
code step as repeated into line I is terminated
as soon as relay I LB picks up and closes its front
mission of a code by a station as hereinafter
described.
The repeater station apparatus as shown in
cludes two line relays RI and R2, controlled over
contact b, and consequently is somewhat shorter
than the ?rst step as measured by relay T. Re
lays RI and- OR become energized in response to
the closing of contact b of relay ILB, and the
the corresponding lines I and 2, each of which
relays is adapted to repeat. the. operation: of, the
closing of ‘front contact b of relay RI connects
other, as well as to repeat the operation of the
corresponding transmitter relay OT or T. The
repeater also includes three slow acting relays,
comprising a timing relay L which serves like.
relay LI of Patent No. 2,229,249 to distinguish be
tween the short or long character of the ?rst step
'of a code, and two bridging relays ILB and 2L3
batteryBZ- to. line 2; so that relays R2 and R pick
up when relay T releases to begin the second step
of‘ the code. Since the ?rst step delivered by re
lay T is relatively short, in comparison with the
?rst step of a control code, relay R2 picks up be
20
by means of which the direction'of transmission
through the repeater'is established and which
to terminal 0. Relay 2L3 therefore picks up on
serve to make the repeater operation dependent
the second step of an indication code, whereupon
its contact b opens the circuit shunting contact I)
upon the continued operation’ of the line relays:
'When the code system is in its normal at rest
condition,_ as shown, the line relays OR and RI
are energized over line I and front contact b oi
of relay R2‘ to render relay R2 effective to control
line I, and the operation of contacts 0 and d of
relayyRZ, by battery BI at the o?ice, and the line
relays R2 and R are energized’ o__v_e_r line 2, back to
contact 0 of relay 2LB and front contact b of_
relay RI, by another battery B2 at the repeater
station, so that the repeater is‘normally in con
dition to transmit signals in either direction.
The transmission of a code is initiated either
by energizing relay OM at the o?fice to cause relay
the other and relays RI and R2 both release.
of the indication code, relay ILB is held picked
and contact 0 of relay I LB by intermittent ener
4.0
gization on the even-numbered‘ steps until relay
RI becomes steadily energized at the end of the
code.
minal- B of a suitable local source of current at
its back contact a over back contact a of relay
‘ILB through relay n to the other terminal o of K‘
the local source, so that relay L picks up, coin;
It is to be understood that in the system of
the patent the initiation of a’ control code by
relay OT‘ is dependent upon the energization of
the master relay OM, and that relay QM cannot
become energized while an indication code is be
pleting a circuit from terminal Bv over contacts
‘a of relays RI and 'L through relay ILB to ter
ing received at the o?ice. A control code thus
minalC so that‘ relay ILB picks up. By closing its
contact b, relay ILB bridges contact‘b of relay
R2, which serves when relay T is the initiating
takes precedence over an indication code initiated
at about the same time only if relay OM picks
up, otherwise the indication code is, transmitted
transmitter to advance the code in line I to the
?rst. The direction of transmission is therefore
second step, providedirelay GT is 'not'operated,
tablishing one-way transmission through the re
peater from line I to line 2, as required for the
transmission of control codes by’ the office relay
transmission through the repeater to allow relay
R2 to rep-eat the code received from line 2 into
line I to operate relay OR at the o?ice in ac
up by intermittent energization on the odd-num
bered steps as already described and relay 2LB
is held picked up over its own front contact a
Relay RI then completes a circuit irom one ter
but when relay OT‘ is the initiating transmitter
the operation of may ILB-‘serves to prevent
transmission from line 2 to line I ,"thereby es
relay ZLB renders relay RI ine?‘ective to control
line 2. Thus relay 2LB reverses the direction of
cordance with the operation of relay T at the
transmitting station. During the transmission
CT to periodically interrupt line ‘I, or by ener
gizing relay M at a ?eld ‘station to ‘cause the
associated relay T to periodically interrupt line
2'. In either case the opening of‘ one lineopens
ifore relay L releases, and completes a circuit from
terminal B_ over front contacts a, of. relays RI and
R2v and contact b oi relay L through relay 2L};
determinedtby relay OM, that is to say, it is de
termined positively by the position of a singli? re
7.21 Ll
lay located at the office. It will be clear there
fore that a single line repeater of the types ordi
narily used in telegraph circuits would not be
suitable for use in the system because in such
repeaters the direction is determined by condi
GO tions at the repeater station.
Taking into account the time lag in the trans
mission of impulses over an electrically long line,
If the code is one initiated by relay OT; the
it will be seen that in Fig’. 1, after the station
?rst step delivered-to line 'I and repeated by relay
transmitter relay T operates to initiate a code, a
OT.
When relay ILB picks up, the opening of its
back contact a deenergizes relay L.
RI into line 2 is a long step, and relay L releases
before the second step, of the code is reached;
Relay RI responds to thecode operation of relay
OT and its contact b repeats the code received
from line I into line 2 tooperate relay R at each
station in accordance with.. the operation of relay
OT, the station coding units being conditioned
by the ?rst long stepto receive the remainder of
the control code as explained in the patent. At
the repeater station relay 2LB remains released,
and relay: ILB 'is held picked up due to its inter
short time may elapse before its effect becomes
manifest at the o?ice during which relays OM and
OT may become energized. If relay OT becomes
energized vduring the transmission of the ?rst
step of an indication code by relay T, relay RI
remains released holding line 2 open after relay
T releases to cause relay R to respond to the long
step and conditioning the station coding unit to
receive the code delivered by relay OT, thereby
preventing the further operation of relay T until
the code delivered by relay OT is completed, pre
2,409,051
5
cisely as if the o?ice and station were controlled
over the same physical line circuit as shown in
length of the second step due to the repeater is
overcome and the normal margin against opera
tion restored. Relay 2F is also responsive to the
the patent. It will be clear therefore that the
second long step of a control code, but in that case
direction of transmission under this condition is
determined, not by the relative order of arrival Oi its circuit already includes a contact I) of relay
OLP, shown in Fig. 1 of the patent and the modi
of signals from two directions at the repeater
?cation shown herein in Fig. 4 consequently does
station, but by the position of the office relay OM,
not change the operation of relay 2F in response
the same as when a repeater is not used.
to a control code.
7
'
In systems of the character described it is the
Referring now to Fig. 2, in this view the coding
practice to provide apparatus at each ?eld station
apparatus is connected in multiple with the line
which is controllable from the omce by which the
operator can disable the transmitter at a ?eld
station to prevent its continued operation in case
wires instead of in series as in Fig. 1, the line cir
cuit comprising two sections 3 and 4 connected
by a repeater vwhich is similar to that of Fig. 1
of a fault. This is accomplished by holding the
line relay R steadily released for a relatively long 15 except as modi?ed to correspond with the change
in line conditions. In Fig. 2 the terminal appa
time interval by the operation of a push button
ratus is correspondingly modi?ed and it is» to be
PB located at the oi?ce. By reference to Fig. lit
understood that in this view and in Fig. 3 as well,
will be seen that if button PB is operated during
the remote control system is arranged as shown
the transmission of an indication code by relay
T, relay OT will be steadily energized opening 20 in my United States Patent No. 2,259,573, issued
October 21, 1941. The line circuits of Fig. 2 are
line I and causing the response of relay Rl to the
normally deenergized and the code in pulses are
code operation of relay R2 to cease, relay RI
in consequence opposite in phase to those of Fig.
remaining released and releasing relay 2L3, which
1. Line 4, to which the ?eld stations are con
places line 2 again under the control of relay Rl,
causing relay R to remain released, as required. 25 nected, is energized on the odd-numbered code
steps only by a battery B4 at the repeater sta
It will be seen that since the operator is able to
tion in the case of control codes or by a battery
reverse the direction of transmission through the
B40. at the transmitting station in the case of
repeater at will the distant line 2 is at all times
controllable from the office.
indication codes, and is deenergized on the even
It may also happen in the normal operation‘ of 30 numbered code steps. Line 3 as shown is ener
gized by carrier currents, that is to say, by alter
the system that two stations initiate indication
codes at the same time. In this case the opera
tion of relay M at the station nearer the oilice
opens the portion of the line circuit leading to
the more remote station so as to cause the two
nating current codes generated by electronic'os
cillators OSC at the o?ice and repeater stations,
with electronic ampli?ers and a frequency selec
r tive ?lter HP interposed in the connections of
stations to transmit their codes successively with
the oscillators and of the line relays to the line.
exception of the ?rst step of an indication code
which is about .05 second longer than the other
short steps due to the operation of additional
relays on that step. In the operation of the re
LP is interposed in the connection of the stations
to line 4 to render the line available for voice or
The repeater of my invention is of particular ad
out interference in the manner pointed out in
vantage in connection with carrier current trans
the patent. In Fig. 1, some of the stations may
mission since it makes it possible to use currents
be located in line i and others in line 2, and in this
of
the same frequency for both directions of trans
40
case if a station in line I and one in line 2 initiate
mission and both oscillators are therefore prefer
codes at the same time relay M at the station in
ably arranged to deliver currents of approxi
line I disconnects battery B! from relay R! and
mately the same frequency.
the effect at the repeater station is the same as
In Fig. 2 an impedance H3 is interposed in the
when button PB is operated. It follows that the
transmitter at the more remote station is disabled , connection of each line relay to the line, shunted
by a back contact I) of the associated transmitter
for the duration of the code transmitted by the
relay
in order to equalize the response of the
nearer station with the same effect as if both sta
line relay to the signals delivered by the associ
tions were located in the same line section.
ated transmitter and to the one at the distant end
In the system of my patent the normalprate
1;.
of
the line as is desirable when the attenuation
of operation is such that the short code steps
of the line signals is high, and a low pass ?lter
have a duration of about .08 second, with the
peater as described this ?rst step as received by
the o?ice relay OR is shorter than the ?rst step
delivered by relay T, as already pointed out, so
that step two as received at the office is length
ened by a corresponding amount and the margin
against the improper operation of the corre
sponding selecting relay when the second step
transmitted by relay T is short is decreased. By
reference to the patent it will be seen that but
one selecting relay is involved, namely relay 2F.
The circuit for this relay, as shown. on Figs. 1. and
2 of the patent, and in a modi?ed form in Fig. 4
of the present application includes contact e of
a timing relay 01.2 and wire I35, which circuit
is closed upon the release of relay 0L2 when the
second step of an indication code is a long step.
In Fig. 4 I have included a contact (1 of the re—
peating relay OLP of the patent, the release of
which follows that of relay 0L2, in the circuit
for relay 2F, whereby the effect of the increased
carrier current communication.
‘
Another difference in Fig. 2 is the provision
of a repeating relay T4 for the line relay R4
which controls the delivery of the carrier current
codes to line 3 at the repeater station, in order
to con?ne these currents to the contacts of a
_, single relay.
It is to be understood that the line circuit sys
tem of Fig. 2 may be a portion of a through line
circuit with the sections connected by suitable
band pass ?lters BP, and may include a plurality
of sections similar to line 4 each having a re
peater station at one end for repeating the codes
over the intervening line between that section and
the o?ice by means of carrier currents as shown.
each repeater and the associated o?ice apparatus
employing a different frequency.
'
It is also vto be understood that a series con
nectedline such as line 2 of Fig. 1. may replace
the multiple connected line 3 in Fig. 2, or that
radio communication may replace the transmis-.
sion of carrier currents over line wires as illus—‘
2,409,!) 5.1
7
trated-by the line section 3,, and that two or more‘
repeaters may be interposed in the circuit con-~
nectingr the of?ceand stations of Fig. 1 0r 2. The
latter arrangement is illustrated more particu
larly in Fig. 3- in which a single frequency, two
way radio channel having the antennas A and
Al as‘ shown, provides a connection between two
battery energized, multiple connected line cir
cuits 3 and 4, Fig. 3 being in other respects sim
8
energized by current from battery B411 and‘ re
lease when relay T advances to-step two of the
code. At the beginning of the second step‘ of
the code supplied to line 4, therefore, relays R
and Rec release, relay ZLBa becoming energized.
The operation of contact 0 of relay ZLBa pre
vents further control of line‘ 4 by relay R3a and
the operation of contact 17 of relay ZLBa estab
lishes relay T4 as a repeater of relay T while re~
10 lay ZLB, which is already energized, prevents
ilar-to: Fig. 2.
Considering the. operation of_ Fig, 3, it will be
further operation of relay T3 and conditions re~
seen ‘that when relay OT is operatedto deliver the.
lay R3 to control relay OR through relay T4 by
first. long impulse ofv a control‘ codev to line 3,
relay T, as in Fig. 1 already described.
relays. R3, T3_,_ L_ and, ILB. respond at the. first re
The operation of push. button PB in Fig. 3
peater stati0n,. relay T3- transmitting a radio. 15 during the transmission of an indication code
signal; of corresponding duration fromv antenna
by relay T likewise has the same result as ‘in
A which, is received; over antenna Al at. the sec->
0nd. repeater station to energize the, correspond
ing relays R311, La- and ILBa, and the receiving
relay- R3a- supplies. current from battery B5 to.
Fig. 1. When button ZPB is operated, relay R3‘
is steadily energized by battery B3 or B3a ir
respective of the code operation of relay R4,
causing relay ZLB to release and relay T3 to be
line 4 over its front contact I). to cause relay R at
come steadily energized which in turn causes re
each. ?eld: station to; operate. its, coding unit CU
in the manner already described in connection
.lay Rita to be steadily energized to release relay
ZLBa and to then supply steady current to line
4 to terminate the operation of the transmitting
coding unit as-required.
withFig, 1.
a
When an‘ indication code is initiated‘ by the,
system of Fig; 3, relay Tat the transmitting sta
tion. picks up and operates the associated relay
Although I have herein- shown and described
only a few forms of apparatus embodying my in
Rand also. operates relay-RM at the second re
vention', it is understood that various. changes
peater station. Relay Rda completes a circuit
and modi?cations may be made therein within
from terminal B. atcontact b of relay ILBa over 30 thev scope of the appended claims without de
its; front contact b: to operate the repeating relay
parting from the spirit and. scope of my inven
T4: which transmits a radio signal from antenna
tion.
A]:
is. received by antenna. A of the ?rst
repeater station to operaterelay- R4. The car-.
rier current delivered to antenna AI also oper
Having thus described my invention, what I
claim is:
1. In a remote control system, an o?ice and a
ates relay R3a locally. Relay R3a by closing its
station connected by a single communication
front contacts a and b energizes relays La and
channel, code transmitters at the o?ice and sta
lLBa of the second repeater station and sup
tion for delivering impulse codes to said chan
plies current from' battery B4'to line 4 to, main
nel, a two-way repeater interposed in said chan
tain relays, Rta- and- R,- energized. Contact I) of 40 nel, a slow acting relay and a. stick relay asso
relay R4 at the ?rst repeater stationnow closes
ciated with said repeater, means for energizing
to supply current from battery B3a to line 3 to
said slow acting relay in response to the ?rst
operate relays R3 and: the o?ice line relay OR.
element of a code received at said repeater sta-Y
Relay R3 energizes relays T3, L and ILB at the
tion, means controlled by said slow acting relay
?rst repeater station and relay T3 delivers car g; Ch for selectively energizing said stick relay in ac
rier current from the associated oscillator OSC to
cordance with the relative length of said ?rst
antenna A, which alsoholds- relay R4 energized.
element, means controlled by said stick relay for
establishing one direction or the other for the
At the second. repeater station‘ relay T4 is re
leased when relay lLBa' pick-5 up and. opens. its
transmission of the remainder of the code
back contact b and relay R30. is then held ener 50 through the repeater in accordance with the po~
sition of said stick relay, and. means responsive
gized by the radio signal received over antenna
to said code for maintaining said stick relay
AI from the ?rst“ repeater stationand continues
tosupply current from. battery B4' to line 4, un-»
picked up until said code is fully transmitted.
der the control of relay R3, as. long as line 31
2. In a. remote control system, an office and
remains energized. When relay ILB at the ?rst 55 a station, connected by- a. single communication
repeater station picks. up, itsv contact b discon
channel, code transmitters at the office and sta
nects battery 133a from line
and its contact
tion for delivering impulse codes to said chan
d’ connects relay R3. directly across line 3, and
nel, a two-way repeater interposed in said chan
if relay OT has not been operated relays OR and‘
nel including two stick relays and a slow acting
R3 release, advancing the code supplied to line 3 60 relay, means for energizing one stick relay and
to the second step, this occurring shortly before
said. slow acting relay in response to the ?rst
relay T releases to' advance the. code supplied to‘
impulse of a code received at said repeater sta
line 4 to the second step. Relay R3 releases re
tion, means controlled by said one stick relay
for establishing one-way communicationthrough
lay T3, discontinuing the supply of carrier cur
rent to antenna A and releasing relay R4. Since: 65 said repeater, means controlled by said slow act
ing relay for selectively energizing the other stick
relays R3 and R4 are now both in the released
position, relay ZLB picks up: and the opening of
relay in accordance with the relative length of.
itsv contact 0. prevents further operation of re-v
said received impulse, means controlled by said
other stick relay when energized for reversing
lay T3, while the; operation ofv contact I) of relay
2LB to its upper position places line 3 under the
the. direction of communication through said‘ re
control of contact I) of relay R4.
peater. and. means controlled by the succeeding
impulses of a code. for maintaining one or both.
At the second repeating station relay RSa re
of said stick relay-5. energized until such code is
leases when the carrier. current received by an-v
fully transmitted.
.
tenna. Al is discontinued, to disconnect battery
134 from line llhbutrelays Rda and Rare held. 75
3. In. a‘remote control system, an office anda
2,409,051
10
ditioning said repeater to repeat the remaining
station, a ?rst communication channel extend
impulses of the code received from said other cir
ing from the o?ice to a distant point‘, a second
communication channel extending from said dis
tant point to said station, coding units at the of
cuit into said one circuit, and means for main
taining said stick relay energized only until such
code is fully transmitted.
?ce and station each including a transmitter for
delivering impulse codes to the adjacent channel
6. In a remote control system, a two-way re
and a receiver responsive to codes supplied there
to at said distant point, means causing the ?rst
impulse of a code delivered by the of?ce trans
mitter to be of one character and the ?rst im
pulse of a code delivered by the station trans
peater connecting two communication circuits,
comprising a line relay for each circuit, each line
relay being adapted to repeat the impulses re
ceived over the corresponding circuit into the cir
cuit which controls the other, two slow acting
relays controlled by one of said line relays and
arranged to be energized successively by such line
mitter to be of a different character, a two-way
repeater at said distant point normally effective
relay when the ?rst impulse of a code is received
to repeat an impulse received from either chan
nel into the other, means responsive to the ?rst 15 from either direction, means controlled by the
?rst slow acting relay for opening the circuit for
impulse of a received code for rendering said
the second slow acting relay to effect its release
repeater effective to repeat succeeding impulses
during the ?rst impulse received but only if such
from the ?rst channel to the second channel only,
impulse is relatively long, means controlled by
a stick relay associated with said repeater, means
for energizing said stick relay following the re 20 said ?rst slow acting relay when energized for
terminating the control of one of said line cir
ception of the ?rst impulse of a code at the re
cuits by the line relay for the other to establish
peater station provided such impulse is of the
one-way transmission through said repeater, a
character delivered by said station transmitter,
stick relay controlled by the second slow acting
means controlled by ‘said stick relay when ener
relay, means e?ective if the ?rst impulse received
gized for reversing said repeater so as to repeat
is terminated before said second slow acting relay
the succeeding impulses of a code from the sec
releases for energizing said stick relay, and means
ond channel to the ?rst channel only, and means
controlled by said stick relayv when energized for
reversing the direction of transmission through
for maintaining said stick relay energized until
such code is fully transmitted.
4. In a remote control system, an office and a 30
station, a ?rst communication channel extending
from the o?ice to a distant point, a second com
munication channel extending from said distant
point to said station, coding units at the of?ce
and station each including a transmitter for de
livering impulse codes to the adjacent channel
and a receiver responsive to codes supplied there
said repeater.
'7. In a remote control system, a two-way re
peater connecting two communication circuits in
cluding a line relay for each circuit, each re
sponsive to code impulses received over the cor
responding circuit and normally adapted to re
peat such impulses into the other circuit, two
stick relays controlled by said line relays, a, pick
up circuit for one stick relay closed when the ?rst
to at said distant point, a two-way repeater at
impulse of a code is received over either circuit,
said distant point normally effective to repeat an
impulse received from either channel into the 40 means effective upon the energization of said one
other, means responsive to the ?rst impulse of a
code received over either channel for rendering
said repeater effective to repeat impulses from the
?rst channel to the second channel only, a stick
relay associated with said repeater, means for en
stick relay for rendering the line relay controlled
from said distant station ineffective to control
the circuit extending to the o?iice thereby estab
lishing one-way communication from the o?ice
'“ to the distant station through said repeater, a
pick-up circuit for the other stick relay closed
only if no impulse is received from the oi‘n‘ce dur
ing the reception of the ?rst impulse .of a code
from the distant station, and means effective
when said second stick relay becomes energized
for rendering the line relay controlled from said
peat succeeding impulses received from the sec
distant station effective to again control the cir
cuit extending to the o??ce and for rendering the
ond channel to the ?rst channel, and means for
maintaining said stick relay energized only as
other line relay ine?ective to control the other
long as the reception of such impulses continues. 5 circuit, and a holding circuit for each stick relay
5. In a remote control system, a two-way re
including its own front contact and a; contact
peater connecting two communication circuits,
closed intermittently during the code operation
comprising a line relay for each circuit, each such
of said line relays.
relay being responsive to code impulses received
8. In a remote control system, a repeater in
ergizing said stick relay following the reception
of the ?rst impulse of a code from said second
channel provided no impulse is received from said
?rst channel prior to the termination of said ?rst
impulse, means controlled by said stick relay when
energized for reversing‘said repeater so as to re
over its circuit from a distant transmitter and 60 cluding two line relays, a code transmitter at a
having a contact for repeating such impulses into
the other communication circuit, means respon
sive to the ?rst impulse of a code received from
control of?ce for supplying code impulses to a ?rst
communication circuit extending to said repeater
for controlling one of said line relays, a code
transmitter at a distant station for supplying
either of said circuits for locally terminating the
corresponding impulse repeated into one of the 65 code impulses to a second communication circuit
extending to said repeater for controlling the
two circuits before the received impulse is ter
other line relay, means including contacts of said
minated, to thereby condition said repeater to re
one line relay for repeating code impulses re
peat impulses in one direction only, from said one
ceived from the oi?ce into said second circuit,
circuit into the other circuit, a stick relay, means,
for energizing said stick relay upon the termina 70 means controlled by the other line relay in re
tion of the ?rst impulse of a code being received
from the transmitter in said other circuit but only
if no impulse is being received at the time from
the transmitter in said one circuit, means con
trolled by said stick relay when energized for con
sponse to the ?rst impulse of a code received from
said station for locally generating an impulse of
relatively brief duration and for supplying such
impulse to said ?rst circuit, and means e?ective
75 only if no impulse is received from the o?ce dur
ago-9,051
1'1
12
inglthe reception bysaid'repeater of the ?rstim
the vother circuit for reversing said ‘direction to
pulse ‘of a code received from said station for
rendering the line relay for said second circuit
e?ective to repeat the succeeding impulses of such
‘render the repeater effective to repeat succeeding
impulses from-said other circuit -'to said~one-cir
cuit only.
code into said ?rst circuit.
9. In a remote control system, a repeater in
cluding two line relays, a code transmitter at a
11. In a remote ‘control system, an of?ce and
a station connected ‘by a single ‘communication
control office for supplying code impulses includ
ing a relatively long ?rst impulse to :a ?rst-com
munication channel extending to said repeater
.for ‘controlling one of said line relays, a code
transmitter at a distant station for supplying
code impulses including a relatively short ‘?rst
impulse to a second communication channel ex
tending to said repeater forcontrolling the other
line relay, code receivers at the of?ce and station,
means including contacts of said one line relay
for repeating code impulses into said second
channel to which the other line relay and the
channel, code transmitters at the o?ice and ‘sta
tion for delivering impulse codes to said chan
nel, interference preventing means at the ‘o?ice
for determining the direction of code transmis
sion over said channel in the event the trans
mission of codes is initiated at the ci?ce and sta
tion at approximately the same time, a two-way
repeater interposed in said channel and normally
e?ective to repeat to said station a code impulse
received from the office and to transmit an im
pulse of brief duration to said office in response
to an impulse received from said station, said
repeater then becoming effective to repeat ‘im
station receiver are responsive, means including 20 pulses in one direction from the o?ice to the sta
contacts of the other line relay operated in ‘re
tion only, and means effective if no impulse is
sponseto the short ?rst impulse of a code received
received from the o?ice in response to the opera
from the station for supplying a locally gen
tion of said interefernce preventing means dur
erated impulse ‘of relatively brief duration to
ing the reception of an impulse from said sta
said ?rst channel to which said one line relay
tion for reversing the direction of said repeater to
and the o?ice receiver are responsive, means
render it eiTectiVe to repeat impulses from the
selectively responsive to the long ?rst im
station to the office only so long as the transmis
pulse of a code received from the oi?ce for
sion of such impulses continues.
rendering the line relay controlled over said
12. In a remote control system, an o?ice and a
second channel ine?ective to supply impulses to 30 station connected by ‘a single communication
‘said ?rst channel, and means effective upon the
channel, code transmitters at the o?ice and sta
termination of the short ?rst impulse of a code
tion for delivering impulse codes to said chan
received from the station provided no impulse is
nel, a two-way repeater interposed in said chan
‘received ‘from the of?ce during the reception of
nel and normally effective to repeat to said sta
such impulse for rendering the contacts of the
tion a code impulse received from the oi?ce and
other line relay effective to repeat the succeeding
to transmit an impulse of brief duration to said
impulses of such code into said ?rst channel and
office in response to an impulse received from said
for preventing said one line relay from repeating
station, said repeater then becoming effective to
such impulses back into said second channel.
repeat impulses in one direction from the o?ice to
10. In a remote control system, a ?rst and a
the station only, and means responsive to the
second communication circuit connected by va re
?rst impulse of a code received from the station
peater normally responsive to a code impulse re
for reversing the direction of said repeater to
ceived over either circuit for supplying an impulse
render it e?ective to repeat impulses from the
to the other circuit, means in said repeater for
station to the office only, said means being re
terminating the impulse supplied to one circuit
' sponsive to prolonged impulse received from the
--pr-ior to the termination of the controlling im
o?ice during the transmission of any of said im
pulse received from the other circuit, said re
pulses including said ?rst impulse for restoring
peater remaining e?ective to repeat succeeding
code impulses in the opposing direction only from
said repeater to its original direction in which it
is effective'to repeat impulses from the o?ice ‘to
said one circuit to said other circuit, and means 50 the station only.
e?ective if no impulse is received from said one
LLOYD V. LEWIS.
circuit during the reception of said impulse from
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