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Патент USA US3066253

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Nov. 27, 1962
A. A. BAKER ETAL
3,066,245
RELAY LOCKOUT CHAIN CIRCUIT
Filed Jan. 4, 1960
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59151
By
ADOLPH A. BAKER
WILLIAM E. SHAFFER
ATTORNEY
United States
,.
atent Q ” M6
B?h?ld?
Patented Nov. 27, 1962
2
1
lay is operated, the operation of any relay in either the
3,066,245
RELAY LOCKOUT CHAIN CIRCUIT
Adolph A. Baker and William E. Shatter, Rochester, N311,
assignors to General Dynamics Corporation, a cor-para
tion of Delaware
Filed Jan. 4, 1950, Ser. No. 324
5 Claims. (til. 317—136)
?rst or second group is positively prevented.
_
Further objects and advantages of the invention will
‘become apparent as the following description proceeds,
and the features of novelty which characterize the inven
tion will be pointed out in particularity in the claims an
nexed to and forming a part of this speci?cation.
For a better understanding of the invention, reference
is made to the accompanying drawing which comprises a
This invention relates in general to switching systems
and more particularly to relay lockout chain circuits for 10 single FIGURE on a single sheet.
The accompanying drawing discloses a relay lockout
use in switching systems.
chain circuit constructed in accordance with the present
Although the invention herein disclosed has many appli
invention.
cations, it is particularly adapted for use in teletypewriter
Although, as previously stated, the relay lockout chain
systems. Teletypewriter systems arranged to transmit or
receive over any one of a plurality of channels, say from 15 which forms the subject matter of this invention has many
applications, it has been illustrated as embodied in a
a central of?ce to any one of a number of stations, are
typical teletypewriter system. As illustrated, the teletype
Well known. In such systems, means must be provided
writer system includes send unit 8 and receive unit 9,
for closing a loop circuit from a teletypewriter in one of
which may be selectively connected to send channels 1, 2,
the stations to a teletypewriter in a different station for the
purpose of transmitting or receiving information. Also, it 20 3 and receive channels 5, 6, 7, respectively. The make
contacts 13, 23, 33 on relays 1t), 2t), 30, respectively, are
may be required at times to check the transmitting units
utilized to close the send unit 8 of the teletypewriter to
and receiving units of the teletypewriter prior to the
channels Ii, 2, 3, respectively, while make contacts 53, 63,
transmission of messages to outside channels. Prior art
and 73 on relays 50, 6d, and 70, respectively, are utilized
switching systems used for teletypewriters usually com
prise a simple arrangement of patch cords and phone jacks 25 to connect receive unit 9 of the teletypewriter to channels
5, 6, and 7, respectively. The normally open make con
wherein any one transmitting channel may be plugged
tacts 43 on relay 40 are utilized to connect the send unit
directly into a send or receive unit of the teletypewriter.
8 to receive unit 9 for testing purposes.
Although the systems of this type are simple and direct,
As illustrated, the relay lockout chain circuit is arranged
their main disadvantage is that a great deal of time is
consumed in setting up connections, especially in central
stations where a plurality of teletypewriters and a plurality
of transmitting channels are employed.
Other switching systems of the prior art comprise a
plurality of lever key switches or push button switches
to be energized by a battery providing forty-eight volts
potential. In the drawing and the description which fol
lows, the negative terminal is shown as (—~) and de
scribed as negative while the positive terminal is shown
as ( +) and referred to as ground.
The relay lockout chain circuit in accordance with
serially connected to the individual channels and the re 35
t e invention comprises a ?rst group of relays 1t), 20, and
spective send or receive units of the teletypewriter. White
30, a second group of relays 5t), 6t), and 70 and a master
connections may be established faster in switching sys
relay 40.
tems of this type than in systems of the patch cord type,
To illustrate the operation of the system, ?rst assume
these systems have inherent characteristics that may be
more troublesome than the patch cord system. For in 40 that it is desired to check the operation of send unit 8
and the operation of receive unit 9 of the teletypewriter
Mstance, by the inadverent operation of a key, a second
before connecting the units to a distant station. When
transmitting channel may be switched to a receive unit
swich 44 is closed, master relay 40 is operated over a cir
at already is receiving from a different channel, re—
cuit extending from ground through break contacts 12, 22,
sulting in crosstalk and cancellation of the message being
‘-_§transmitted, since the individual switches do not lock out 45 and 32, its winding, switch 44, and through break con
tacts 51, 61, and 71 to battery. When relay 49 operates,
‘the other channel switches in the circuit.
send unit 8 is connected to receive unit 9 through make
“~ Accordingly, it is a general object of the present inven
contacts 43 for testing purposes. Also, when master relay
tion to provide a simpli?ed form of control and super
40 is operated, each of the ?rst group relays 10, 20, 3th is
visory circuit for an operator’s position to control the
disabled since negative potential is removed from its oper
routing of communication apparatus, as for instance, re
ating circuit by break contacts 41. Similarly, when relay
ceive and send units of teletypewriters.
49 is operated, each of the second group relays 50, 60,
It is a more particular object of this invention to provide
and 70 is disabled since ground is removed from its operat
a relay lockout chain circuit having a minimum number of
ing circuit by break contacts 42. After completing the
contacts on each relay and which is reliable, versatile,
test, switch 44 is opened and the circuit is now ready for
easily expandable, and readily adaptable for controlling
the selective connection of send unit 8 and receive unit 9
and locking out functions of automatic machines.
to any one channel in the groups of channels 1, 2, 3, and
Briefly, the present invention accomplishes the above—
5, 6, 7, respectively.
cited objects by providing ?rst and second groups of re
The relays of the ?rst group of relays 10, 20, and 30
lays and a master relay, all connected in a lockout chain
con?guration. The relays of the ?rst group of relays in 60 individually control the connection of the send unit 8
to send channels 1, 2, and 3, respectively. Assume that
dividually control the connection of a teletypewriter trans
it is desired to transmit from send unit 8 to channel 2 and
mitter to any one of a plurality of channels, the relays
to thus lock out channels 1 and 3 and the master relay 40.
of the second group of relays individually control the con-_~
When switch 24- is closed, relay 20 is operated over a cir
nection of a teletypewriter receiver to any one of a plu
cuit extending from ground through break contacts 12,
rality of channels, and the master relay controls the con
its winding, switch 24, and through break contacts 31 and
nection of the send unit to the receive unit for testing pur
41 to battery. When relay 20 is operated, relay It) can
poses. In accordance with the invention, only one relay
not operate since negative potential is removed from its
may be operated at any given time in either the ?rst or
operating circuit by break contacts 21. Similarly, when
second group of relays and the master relay is prevented 70 relay 20 is operated, relays 30 and 40 are disabled since
from operating when a relay is operated in either the ?rst
ground is removed from their operating circuits by break
or second group of relays. Further, when the master re
contacts 22.
3,066,245
3
While relay 26B is energized, make contacts 23 are closed,
permitting the transmission of messages by the teletype
writer from send unit 25 over channel 2 to a distant station.
As long‘as switch 241 is closed, relay 2-3 remains energized
and in accordance with the invention, the operation of
either of the switches 14 and 34, which control relays
1d and 3d, respectively, of the ?rst group of relays it),
4
?rst group, means responsive to the operation of any one
of the relays in said second group for preventing the opera
tion of any other one of the relays in said second group,
means for operating said master relay only if a relay is
not operated in said ?rst and second groups, and means
responsive to the operation of said master relay for pre
venting the operation of any relay in said ?rst and second
20, 36 or the operation of switch 44 controlling master
groups.
relay 4%, will not interfere with the transmission of infor
2. A relay lockout chain circuit comprising ?rst and
mation over channel 2 since relays ill, 36D and Kill are 10 second groups of relays and a master relay, means for
positively prevented from operating as previously de
selectively operating any one of the relays in said ?rst
scribed. Returning the switch 24 to the open position de
group irrespective of the operation of any relay in said
energizes relay 2t) and returns the break contacts 21 and
second group, means responsive to the operation of any
22 to the normally closed positon and opens make con
one of the relays in said ?rst group for preventing the
tacts 23. Now any relay in the ?rst group of relays ill,
operation of any other one of the relays in said ?rst group
20, 39 or master relay 4-1? may be operated in the same
and said master relay, means for operating any of the
manner as just described.
In a similar manner, send unit 8 may transmit over
channel 3 when relay 30 is operated. Provided, of course,
that no relay in the ?rst group of relays id, as,
is
energized and that the master relay 46* is not energized,
relay 3%‘ is operated when switch 34- is closed. The cir
cuit path for relay 3h extends from ground through break
contacts 12, 2.2, relay Pail winding, switch 34 and through
break contacts
to battery. When relay 30 is operated,
relays ill and 2% cannot operate since negative potential
is removed from their operating circuits by break con-'
tacts 31. Similarly, when relay 30 is operated, master
relay 4t) is disabled since ground is removed from its
operating circuit by break contacts 32.
The operation of the relays of the second group of relays
569, 69, 7tl is similar to the operation of the relays of
the ?rst group of relays lltl, Ztl‘, and 36'. For example,
receive unit 9 is connected to channel 6 through make
contacts 63 when relay oil is operated. Relay 6%‘ is oper
ated when switch 64 is closed provided no other relay in
the second group of relays 5t), 70 or master relay Altl is
energized. The operating circuit for relay as may be
traced from ground through break contacts 42, 52, the
winding of relay 63’, switch as and through break con
tacts '71 to battery. When relay Ml is operated, master
relay 4t} and relay 56 cannot operate since negative po
tential is removed from their operating circuits by break
relays in said second group irrespective of the operation
of any relay in said ?rst group, means responsive to the
operation of any one of the relays in said second group for
preventing the operation of any other one of the relays in
said second group and said master relay, means for oper
ating said master relay, and means responsive to the
operation of said master relay for preventing the operation
or" any relay in said ?rst and second groups.
3. A relay lockout chain circuit comprising ?rst and
second groups of relays and a master relay, means for
selectively operating any one of the relays in said ?rst
group irrespective of the operation of any relay in said
second group, means responsive to the operation of any
one of the relays in said ?rst group for preventing the
operation of any other one of the relays in said ?rst group,
means for operating any one of the relays in said second
group irrespective of the operation of any relay in said
?rst group, means responsive to the operation of any one
of the relays in said second group for preventing the
operation of any other one of the relays in said second
group, means for operating said master relay only if a
_clay is not operated in said ?rst group, and means re
sponsive to the operation of said master relay for prevent
ing the operation of any relay in said ?rst and second
groups.
4. A relay lockout chain circuit comprising a ?rst relay
in a ?rst group of relays, a ?rst relay in a second group
contacts ‘61 and relay 7t) is disabled since ground is re
of relays, and a master relay, each of said relays having
moved from its operating circuit by break contacts 62.
45 a winding and ?rst and second break contacts, a source.’
When switch as is opened, relay all is deenergized with
of potential having ?rst and second terminals, 2. switch
the subsequent closing of break contacts 61 and 62 and
individual to each of said relays, means for returning
the opening of make contacts 63. The relay lockout chain
one terminal of the winding of said master relay through
circuit second group of relays Ell, 6%, 7t!’ and master relay
said ?rst break contacts on said ?rst relay in said ?rst
4d are now able to be individually controlled by their re
group of relays to said ?rst terminal of said source of
spective switches 54, 64, 74 and 44?, respectively. Relays
potential, means for returning the other terminal of the
5t) and 70 in the second group of relays operate in a
winding of said master relay through the switch individ~
manner similar to the operation just described for relay 68.
ual to said master relay and said second break contacts
While there has been disclosed what is at present con
on said ?rst relay in said second group of relays to
sidered to be the preferred embodiment of the invention,
said second terminal of said source of potential, means
modi?cations thereto will readily occur to those skilled in
for returning one terminal of the winding of said ?rst
the art. For example, it will be obvious to those skilled
relay in said ?rst group of relays to said ?rst terminal
in the art that relays may be added to either group of
of said source of potential, means for returning the
relays it), 20, 3t) and 50, ti?, 70, respectively, without
other terminal of the winding of said ?rst relay in said
adding any contacts to the relays of the lockout chain.
?rst group of relays through said switch individual to
it is not, therefore, desired that the invention be limited
said ?rst relay in said ?rst group of relays and said
to the speci?c arrangement shown and described and it
l
is intended in the appended claims to cover all such modi
?cations as fall within the true spirit ‘and scope of the
second break contacts on said master relay to said
second terminal of said source of potential, means for
invention.
65 returning one terminal of the winding of said ?rst relay
in said second group of relays to said second terminal
What is claimed is:
of said source of potential, and means for returning
"1. A relay lockout chain circuit comprising ?rst and
the other terminal of the winding of said ?rst relay in
second groups of relays and a master relay, means for
said second group of relays through the switch individ
selectively operating any one of the relays in said ?rst
group irrespective of the operation of any relay in said 70 ual to said ?rst relay in said second group of relays
second group, means responsive to the operation of any
one of the relays in said ?rst group for preventing the
operation of any other one of the relays in said ?rst group,
means for operating any one of the relays in said second
group irrespective of the operation of any relay in said
and said ?rst break contacts on said master relay to
said ?rst terminal of said source of potential.
5. A relay lockout chain circuit comprising a ?rst
relay in a ?rst group of rela/s, a ?rst relay in a second
group of relays, and a master relay, each of said relays
3,066,245
5
having a winding and ?rst and second break contacts,
a source of potential having ?rst and second terminals,
a switch individual to each of said relays, means tor
interposing said ?rst break contacts on the ?rst relay
in said ?rst group between said ?rst terminal of said
source of potential and one terminal oi the winding
of said master relay, means for interposing the switch
individual to said master relay and the ?rst break con
tacts on the ?rst relay in said second group between
the other terminal of the winding of said master relay
and the second terminal of said source of potential
whereby the operation of said ?rst relay in said ?rst
group of relays or the operation of the ?rst relay in said
second group of relays prevents the operation of said
master relay, means for returning one terminal of the
6
of said ?rst relay in said second group of relays to the
second terminal of said source of potential, means for
interp'lc‘is‘ing the switch individual to said ?rst relay in
said second group of relays and said ?rst break con
tacts on said master relay between the other terminal
of the winding of said ?rst relay in said second group
of relays and said ?rst terminal of said source of poten
tial whereby the operation of the master relay prevents
the operation of said ?rst relay in said second group of
relays.
References Cited in the ?le of this patent
UNITED STATES PATENTS
winding of the ?rst relay in said ?rst group of relays
2,602,150‘
2,716,206
Hauck _______________ __ July 1, 1952
Salati _______________ __ Aug. 23, 1955
to the ?rst terminal of said source of potential, means
2,922,084
Franz _______________ __ Jan. 19, 1960
1,040,111
Germany _____________ __ Oct. 2, 1958
for interposing the switch individual to said ?rst relay
in said ?rst group of relays and said second break contacts
on said master relay between the other terminal of the 20
Winding of said ?rst relay
and said second terminal
whereby the operation of
the operation of said ?rst
relays, means for returning
FOREIGN PATENTS -
in said ?rst group of relays
of said source of potential
OTHER REFERENCES
said master relay prevents
Publication: “Relay Engineering,” Struthers-Dunn, Inc.,
relay in said ?rst group of
one terminal of the winding 25 copyright 1945.
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