close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2403877

код для вставки
July 9, 1946.
'
" w. 'r. POWELL
TELEPHONE LINE CIRCUIT
2,403,377
‘
Filed Aug. 24, 1944‘
INVENTOR.
was?Arfomvzr
My
Patented July 9, 1946
UNITED
2,403,877
STATES ’ PATENT‘ OFFICE
2,403,877
TELEPHONE LINE CIRCUIT
Winfred T. Powell, Rochester, N. Y., assignor to
Stromberg-Carlson Company, Rochester, N. Y.,
a corporation of New York
Application August 24, 1944, Serial No. 551,006
5 Claims. (Cl. 179-17)
1
This invention relates to telephone systems and
more particularly to a line circuit for use therein.
In the type of automatic telephone system dis
closed in Powell Patent No. 2,325,877, granted
August 3, 1943, it has been necessary in the past
to provide for each telephone line, not only a line
relay and a cut-off relay but also a so-called
lockout relay, whenever the lookout feature was
desired.
The main feature of the present invention re
.
V
>
2
armature springs herein indicated by the letter
L associated therewith. This operation of the line
relay 6 immediately applies positive potential at
the front contact and armature IE! or the line
relay over conductor H to the connector sleeve
l2 of this line for making this line busy against
seizure by any connector switch. Since the, line
relay '6 is maintained operated throughout an
originating connection, this positive battery is
held on the connector sleeve l2 for maintaining
this line busy.
in an automatic telephone system of the men
It has been previously mentioned that the
present line relay circuit is especially applicable
tioned type.
to a system utilizing the switching arrangement
Another feature of the invention relates to a
telephone line circuit which provides the lookout 15 disclosed in the mentioned Powell patent. In
the system of the patent, tens lockout relays and
feature of the system of the patent and yet re
units lockout relays for a group of lines are pro
quires only two relays per line in contrast to three
vided to mark the originating or calling line so
relays per line previously required for service of
that it will be seized by suitable ?nder switching
this kind.
mechanism.
For an understanding of the invention, refer
Also. when the line relay 6 is operated in the
ence is made to the drawing wherein there is
illustrated a single telephone line together with
manner just described, it closes a circuit from
the positive pole of battery, light armature spring
its ?nder contacts and connector contacts, as
13 and contact of the line relay, strong armature
well as the relays individual to the line and two
of the chain marker relays of a line group for 25 spring M and back contact of the line relay,
which strong spring is not operated by the men
marking this line so that it will be seized.
tioned operation of the line relay, winding of the
In the operation of this telephone line circuit,
tens lockout relay l5, and thence through the
when the subscriber on this line originates a call,
armatures and contacts of other tens lockout re
the line relay 6, which also performs the func
lays (not shown), to the negative pole of battery.
tions of a cut-off relay, is energized. This line
The tens lockout relay I5 is thus operated and
relay is provided with two sets of armature
at its armature and front contact extends the
springs, one set being closed when the relay is
positive pole of battery through the back contact
energized by weak current and both sets being
and strong armature spring it of the line relay 6,
closed when the relay is energized by strong cur
front contact and light armature spring I‘! (now
rent. This result may be achieved by providing
closed), of relay 6, winding of the units lockout
one armature on the relay responsive to relatively
relay [8 and through the armatures and contacts
weak currents for actuating the so-called “light"
in series of other units lockout relays to the
contact springs and by providing a second arma
negative pole of battery. The tens lockout relay
ture responsive to relatively strong currents for
I5 and the units lockout relay l8 mark the calling
actuating the. so-called “strong” contact springs.
line (herein illustrated) so that the ?nder switch
Alternatively, the line relay, which may be pro
mechanism a (not shown) extends an idle link
vided with a single armature, is marginal in
(likewise not shown) to the tip, ring and sleeve
operation to actuate this armature in two steps,
contacts 28, 2! and 22 of the calling line. As
depending on strength of energizing current, to
soon as the ?nder switching mechanism seizes
close the so-called “light” and “strong” contact
the callinglline, positive battery is applied from
springs. The energizing circuit of the relay 6
the link of the mentioned ?nder through the
extends from the negative pole of battery, lower
sleeve contact 22 and sleeve conductor 23 through
winding of relay 6', resistor ‘l, inner back contact
the lower winding of the line‘ relay 6 to the nega
and armature of cut-off relay 8 Over the ring side
of the calling, liner and through the substation 50 tive pole of battery. The energization of this
lower winding of the relay 6 causes this relay to
circuits thereof, tip side of the line, uppermost
attract its strong armature springs so that not
armature and back contact of lock-out relay 8,
only the light armature springs previously oper
upper winding of the line relay 6 to the positive
ated but also the strong armature springs of this
pole of battery. The operation of the line relay
at this time is. effective to close only its; light 55 relay are now operated. The circuit including
lates to a simpli?ed telephone line circuit for use
2,403,877
3
the sleeve conductor 23 also extends through the
conductor 24, middle winding of the di?erentially
wound lockout relay to the negative pole of bat
tery. The lockout relay 8 is operated in this cir
cult and thereby removes the battery bridge in
cluding both windings of the line relay 6 from the
calling line. The line relay 6, however, is-main
A.
operated in response to relatively Weak current
through a winding of said relay and the second
ary sets of contact springs being operated in re
sponse to relatively strong current through a
winding of said relay, a second relay having two
sets of normally closed contacts, said line relay
on the initiation of a call on said line having its
two windings connected in a series circuit in
cluding both sides of said line and said normally
conductor 23, in the manner just described.
When the line relay attracts its strong armature 10 closed contacts, said series circuit having su?i
cient resistance therein to limit the current
springs, it closes its armature spring 25 and
tained operated in its circuit, including the sleeve
front contact which short circuits, the resistor ‘I,
through said line relay whereby only the primary
contact springs thereof are operated, control-'
ling means including operated primary contact
relay 6 attracts its strong armature springs, it
opens its springs 14 and I6 which interrupt the 15 springs and non-operated secondary contact
springs for effecting the extension of said tele
marking circuits to deenergize the tens lockout
phone line responsive to the operation of the line
relay l5 and the units lockout relay l8.
relay on the initiation of a call, a circuit inde
When the line herein illustrated is called, posi
pendent of said resistance completed for said line
tive battery applied to the ‘connector terminal I2
is extended through the conductor H, armature 20 relay responsive to the extension of said line
whereby both primary and. secondary contact
spring l0 and back contact of the line relay 6,
springs are operated by said line relay, a circuit
lowermost winding of the lookout ‘relay to the
completed over said ?nder sleeve conductor for
negative pole of battery. The lockout relay is
operating said second relay also in response to
operated in this circuit and removes the battery
25 the extension of said telephone line, and an
bridge from the called line.
operating circuit completed for the second relay
When a connection to or from the line of the
through the connector sleeve conductor respon
character just described is released, both the line
sive to the extension of a call to said telephone
relay 6 and the lockout relay 8 release and
line, whereby the normally closed contacts of the
thereby restore the line circuit to its normal con
30 second relay are operated to disconnect the line
dition.
relay from said line.
In the case of a revertive call, as, for example,
2. In an automatic telephone system, a tele
when station TEL A desires to call station TEL B
phone line, a ?nder sleeve conductor and a con
(see drawing) on the party line, or vice versa,
nector sleeve conductor associated‘with said line,
when the calling or the called party answers fol
a line relay having two windings and also primary
lowing the temporary closure of the calling
and secondary sets of contact springs operated
switch-hook following the extension of the call,
thereby, the primary sets of contact springs being
positive battery is removed from the ?nder con
operated in response to relatively weak current
ductor 23 (in the manner shown in the mentioned
through a winding of said relay and the sec—
patent) which effects the release of the lockout
ondary sets of contact springs being operated in
relay 8 but since the line relay 6 is slightly slow
response to relatively strong current through a
acting, this latter relay does not release. The
winding of said relay, a second relay having at
line relay is now maintained energized through
least two windings and two sets of normally
both of its windings in series, back contacts and
closed contact springs, said line relay on the ini
armatures of the lookout relay 8 and the two
tiation of a call on said line having its two
sides of the line in series. In this instance, the
windings connected ina series circuit including
resistor l is short circuited and the lower winding
both sides of said line and said normally closed
of the relay ‘6 being connected in the mentioned
contacts, a resistor connected in said series cir
circuit through the front contact and the strong .
cuit to limit the current through said line relay
armature spring 25 of this relay. This circuit
also serves to supply talking battery to this line ; whereby only the primary contact springs thereof
are operated, means controlled through said pri
during the revertive call. Since both the light
mary and said secondary sets of contacts for
and strong armature springs are actuated at this
‘effecting the extension of said telephone line re
time, the line is held busy at the connector sleeve
sponsive to the operation of the line relay on the
l2 and the circuit to the marking relays I5 and
for a purpose to be described. Also when the line
i 8 is opened at the strong armature springs I 4 i
and I6. During the holding of the line relay 6,
initiation of a call, a circuit independent of said
resistor completed for said line relay responsive
to the extension of said line whereby both pri
mary and secondary contact springs are operated
by said line relay, a circuit completed through the
in the case of the revertive call, the two upper
windings of the lockout relay 8 are connected di
rectly in multiple with the windings of the line
relay 6. However, the two upper windings of the 60 ?nder sleeve conductor and one winding of the
second relay for operating the same also in re
lockout relay are diiferentially connected so that
sponse to the extension of said telephone line, and
this relay does not operate at this time.
a circuit completed through the connector sleeve
It should also be pointed out that two upper
conductor andv another winding of the second
windings of the lockout relay 8 are also connected
in parallel with the two windings of the line relay 65 relay for operating the same responsive to the
extension of a call to said telephone line, whereby
6 during the initiation of a call. In this case also
the normally closed contacts of the second relay
the lookout relay is not operated because of its
are operated to disconnect the line relay from
differential connection.
said line.
What I claim is:
3. In an automatic telephone system, a tele
1. In an automatic telephone system, a tele
phone line, a ?nder sleeve conductor and a con
nector sleeve conductor associated with said line,
a line relay having two windings and also primary
and secondary sets of contact springs operated
thereby, the primary sets of contact springs being
phone line, a line relay having two windings and
also primary and secondary sets of contact
springs operated thereby, the primary sets of
contact springs being operated in response to
relatively weak current through a winding of said
2,403,877
5
6
relay and the secondary sets of contact springs
being operated in response to relatively strong
erated to disconnect the line relay from said line,
current through a winding of said relay, a second
relay having two sets of normally closed contact
springs, said line relay on the initiation of a call
on said line having its two windings connected
in a series circuit including both sides of said
line and said normally closed contacts, a resistor
connected in said series circuit to limit the cur
said last mentioned circuit being interrupted on
the completion of a revertive call on said line for
releasing the second relay whereby said line relay
is reconnected to said line, and means responsive
to the release of said second relay for energizing
the di?erentially connected windings thereof.
5. In an automatic telephone system, a tele
phone line, a ?nder sleeve conductor and a con
rent through said line relay whereby only the 10 nector sleeve conductor associated with said line,
primary contact springs thereof are operated,
a slow releasing line relay having two windings
means including a tens lockout relay and a units
and also primary and secondary sets of contact
springs operated thereby, the primary sets of con
lockout relay for effecting the extension of said
tact springs :being operated in response to rela
telephone line responsive to the initiation of a
call thereon, each of said lockout relays being op 15 tively weak current through a winding of said
erated through a primary set of contact springs
relay and the secondary sets of contact springs
being operated in response to relatively strong
and through a secondary set of contact springs, a
current through a winding of said relay, a second
circuit independent of said resistor completed for
relay having a pair of differentially connected
said line relay responsive to the extension of said
line whereby both primary and secondary con 20 windings and a third winding as well as two sets
tact springs are operated by said line relay, a cir_
of normally closed contact springs, said line relay
cuit completed for operating said second relay
on the initiation of a call on said line having its
also in response to the extension of said telephone
two windings connected in a series circuit in
cluding said sides of said line and said normally
line, whereby the normally closed contacts of the
second relay are operated to disconnect the line 25 closed contacts, a resistor connected in said series
circuit to limit the current through said line relay
relay from said line.
whereby only the primary contact springs there
4. In an automatic telephone system, a tele
of are operated, means including a tens lockout
phone line, a slow releasing line relay having two
relay and a units lockout relay for effecting the
windings and also primary and secondary sets of
contact springs operated thereby, the primary 30 extension of said telephone line responsive to the
sets of contact springs being operated in response
initiation of a call thereon, each of said lockout
relays being operated through a primary set of
to relatively weak current through a winding of
contact springs and through a secondary set of
said relay and the secondary sets of contact
springs being operated in response to relatively
contact springs, a circuit independent of said re
strong current through a winding of said relay, a 35 sistor completed for said line relay responsive to
second relay having a pair of differentially con
nected windings and two sets of normally closed
the extension of said line whereby both primary
and secondary contact springs are operated by
said line relay, means including an operated sec
contacts, said line relay on the initiation of a call
ondary set of contact springs for short circuiting
on said line having its two windings connected in
a series circuit including said sides of said line 40 said resistor, a circuit completed through the
?nder sleeve conductor and through one of said
and said normally closed contacts, a resistor con
pairs of windings for operating said second relay
nected in said series circuit to limit the current
through said line relay whereby only the primary
also in response to the extension of said tele
phone line, and a circuit completed through the
contact springs thereof are operated, switching
means controlled by primary and secondary con 45 connector sleeve conductor and the third winding
of the second relay for operating the same re
tact springs of said line relay for effecting the
sponsive to the extension of a call to said tele
extension of said telephone line responsive to the
phone line, whereby the normally closed contacts
initiation of a call thereon, a circuit independent
of the second relay are operated to disconnect
of said resistor completed for said line relay re
sponsive to the extension of said line whereby 50 the line relay from said line, the circuit through
the ?nder sleeve conductor being interrupted on
both primary and secondary contact springs are
operated by said line relay to stop the operation
the completion of a revertive call on said line for
of the switching means, a circuit completed
releasing the second relay whereby said line relay
through one of the pairs of windings for operat
ing said second relay also in response to the ex
tension of said telephone line, whereby the nor
mally closed contacts of the second relay are op
is reconnected to said line, and means responsive
55 to the release of said second relay for energizing
the differentially connected windings thereof.
WINFRED T. POWELL.
Документ
Категория
Без категории
Просмотров
0
Размер файла
543 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа