Year: 1898

page_text: A communication from abroad by ALLFY THOMAS NYF, of No 36, West 120th
Street, New York, in the United States of America
I, PHILIP MIDDLETON JUSTICE, of 55 and 56, Chancery Lane, in the County of
Middlesex, Fellow of the Chartered Institute of Patent Agents, do hereby declare
the nature of this invention to be as follows-
This invention relates to those devices which are located at the cential office
or exchange of a telephone system and serve to indicate to the operator or
attendant what subscriber is calling and desues a connection with another sub-
scribe to be established, and also to indicate to the operator or attendant when
a subsciber has finished talking, and by means of which the operator or attend-
ant is able to effect the desired connection between different subscribers' lines
The object of the invention is to produce a simple, compact and inexpensive
device of the character described, and one not liable to get out of order, and
especially to produce a device of this character such that the introduction of
the plug by the operator for the purpose of establishing the desired connection
between subscribers' lines shall restore the device to such a condition that it
will serve as a nging off or clearing out signal when the subscriber rings off
to indicate that he has finished talking, and such that the removal of the plug
by the operator for the purpose of disconnecting the subscribers' lines after the
ringing off estores the device to condition to serve as a calling signal \
further result altamed by the mvention is that the coil of the electro-magnet
which is in sees in the subscriber's ne during the calling, is budged across
the line by the introduction of the operator's plug; when the desired connection
is established, so that the high resistance of this coil is removed from the encust
while the talking is going on
In carrying out the invention it is preferred to employ as the signaling device
to attract the operator's attention a small electric lamp which is included in a
local encuit normally open but adapted to be closed whenever the subscriber
calls It is obviously immaterial, however, what form of signaling device is
employed
When the calling current is sent through the coil of the annunciator, the
amature of the latter is attracted and its movement closes the local cucuit of
the signaling device A latch engages the armature when it is attracted and
holds it in its attracted position When the operator's plug is inserted it
strikes a camlike projection on the latch and releases the armature, thus open-
ing the local circuit of the signaling device and leaving the signaling device
in readiness to be operated again when the subscriber rings off The introduc-
tion of the plug establishes connection with the subscriber in the usual manner
and at the same time it changes the connections between the subscriber's line
and the coil of the electro-magnet so that the latter is no longer in series in the
line but is bridged across the line and its resistance is removed from the talking

page_text: circuit. When the subscriber rings off, the ringing off current passes through
the coil of this electro-magnet, being a magneto current, and causes the arma-
ture to be again attracted This action closes the local circuit of the signaling
device and the operator is thereby informed that the subscriber has finished
talking and thereupon the operator removes the plug. A shoulder is formed on
the plug for the purpose of co-operating with the cam projection on the latch
above mentioned, such shoulder sliding over and beyond the said cam projec-
tion when the plug is introduced During the removal of the plug the said
shoulder therefore makes contact with the cam projection again and again
releases the latch, permitting the armature to fly back, thereby opening again
the local circuit of the signaling device and restoring the annunciator once
more to a condition to be operated again when the subscribe again calls up
the operator. The removal of the plug also changes the connections so that
the coil of the electro-magnet is placed once more in selles
It will be observed that the improved annunciator is not only a self-restoring
annunciator, but that it serves the double purpose of a calling signal and of a
ringing off signal
Dated this 27th day of December 1898.
лшргоуещение ш Аррагасив логове и гезернове схопацков,
A communication from abroad by ALLEN THOMAS NYE, of 36, West 120th
Street, New York, in the United States of America
I, PHILIP MIDDLETON JUSTICE, of 55 and 56, Chancery Lane, in the County of
Middlesex, Fellow of the Chartered Institute of Patent Agents, do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following state-
ment.-
This invention relates to telephone switch boards and more especially to the
annunciatois o diops and to the electrical connections of the same with othe
parts of the system One object is to simplify and improve the construction of
annunciators or drops and a further object is to so construct the annunciators
and to so anange their electrical connections that each annunciator or diop
shall seive the double purpose of a calling signal, to indicate to the operator
the number of the subscribe who desnes a connection to be established, and
as a inging off signal, to indicate to the operator when such subscibei has
finished his communication In the practical operation of the invention in the
form chosen for illustration and description hereinafter, the introduction of
the operator's plug for the purpose of establishing desued connection after the
operation of the calling signal, 18 made to restore the drop to such a position
that it will respond to the nging off by the subsciber, while the withdrawal
of the plug by the operator for the purpose of disconnecting the subscribers'
lines after the 1nging off, again restores the drop to a condition in which it
will serve again as a calling signal. Moreover, the construction of the diop
and the arrangement of the electrical connections is such that the coil of the
electro-magnet of the diop, which 18 in series in the subscriber's line during
the calling. is budged across the line by the introduction of the operator's plug
when the desired connection is established, so that the lugh resistance of this
coil is removed from the cucnit while the talking is going on The signaling

page_text: device which is employed to attract the operator's attention, in the embodiment
of the invention shown in the drawings, is a small electric lamp included in
the local circuit which is normally open but is adapted to be closed whenever
the subscriber calls It is obviously immaterial, however, what form of signal-
ing device is employed.,
The invention will be more fully described hereinafter with reference to the
accompanying drawing, in which,
Figure 1 is a vertical section of one of the annunciators or drops, with parts
in elevation, a portion of the supporting board being indicated and the opera-
tor's plug being shown in section in readiness for introduction into the jack;
Figures 2 and 3 are respectively a top view and a bottom view of the annun-
ciator or drop removed from the board,
Figure 4 is an end view thereof, with the signaling device and its circuit'
indicated diagrammatically
In the form of the annunciator or drop represented in the drawing, the
several parts, for convenience in manufacture, are supported by a plate A which
18 secured in any suitable manner to the board B. A sleeve C is extended for-
ward from the plate A to guide and support the operator's plug in proper rela-
tion to parts with which it co-operates A socket is also provided, as at a, to
receive the lamp D which, in this particular instance, 18 adopted as the signal-
ing device. Upon the rear side of the plate A 18 secured the electro-magnet E
with its armor F, the latter supporting in a suitable manner the other parts
hereinafter referred to The armature G, pivoted at and thrown back nor-
mally by a spring ³, 18 provided with an arm G¹ which carries a contact strip
o bridge, adapted to establish connection between two fixed contacts 7
and of when the magnet E is energized and the armature attracted The arma-
ture 18 retained in its forward position, until released by a movement of the
operator's plug, by a latch H which is represented as a lever pivoted at its
middle and having a toe h for co-operation with the operator's plug Two
sping contacts I and I are also supported so as to co-operate respectively with
the core and the shell or sleeve of the operator's plug The latter is repre-
sented in Figure 1 as of substantially common construction, having a tip or
core K and a sleeve K¹, to which the wnes of the operator's set are connected
as usual.
The two spring contacts and form the terminals of the local circuit
which includes the lamp D and is closed from one terminal to the other by the
bridge or contact piece when the armature G is attracted, whereby the lamp
receives current and glows so long as the armature is held in its forward nosi-
tion by the latch H The line wire, which normally includes the magnet E in
series, is connected, on each side of the magnet to the contacts I I¹ respec-
tively. so that when the operator's plug is inserted and the talking circuit com-
pleted through said contacts and the tip and sleeve of the plug and their
connections, the magnet becomes bridged on the line and its resistance is
removed from the talking circuit When the plug is inserted, a shoulder on
the tip engages the toe h of the latch H and causes the latch to release the
armature G. whereby the local circuit through the lamp is broken but when
the plug is thrust completely home a notch receives the toe h and leaves the
latch free to move again When the subscriber has finished his communica-
tion and hangs up his receiver, thereby closing the ringing circuit through the
magnet and rings off, the magnet is again energized, its armature is attracted
and held by the latch H. thereby arain closing the local circuit through the
lamp between the contacts, so that the lamp continues to glow until the
latch is again onerated to release the armature by the contact of the shoulder k
of the plug with the toe h of the latch, when the nlup 19 withdrawn The
removal of the plug therefore not only breaks the local circuit through the
lamn, but leaves the jack in its original condition in readiness to respond to
another call,

page_text: It will be seen, therefore, that not only is the construction of the jack exceed-
ingly simple, but that the single device, with the proper connections, serves
both as a calling signal and as a ringing off signal, thereby dispensing with a
separate ringing off signal and the complicated connections consequent upon
the use of a separate ringing off signal
It will be obvious that the details of construction and arrangement may be
varied without departing from the spirit of the invention while providing for
the accomplishment of the same general result, wherefore the invention is not
to be limited to the precise construction and arrangement of parts shown and
described herein
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is
1. In a telephone annunciator, the combination with an electio-magnet, a
Bignaling device controlled by the armature of said magnet, and line connec-
tions to said magnet, of a latch to engage said armature and control its move-
ments, said latch standing in the path of movement of the operator's plug and
operated during the insertion of the plug and again during the withdrawal of
the plug, substantially as shown and described
2 In a telephone annunciator, the combination with an electio-magnet, a
local circuit including a signal and controlled by the armature of said magnet,
and line connections to said magnet, of a latch to engage said armature and
control its movements, said latch standing in the path of movement of the
operator's plug and operated during the insertion of the plug and again during
the withdrawal of the plug, substantially as shown and described
3 In a telephone annunciator, the combination with an electro-magnet, a
normally open circuit including a signal and closed by the armature of said
magnet when the latter is attracted, and line connections to said magnet, of a
latch to engage said armature and retain it in its forward position, said latch
standing in the path of movement of the operator's plug and operated during
the insertion of the plug and again during the withdrawal of the plug to release
said ai mature, substantially as shown and described
4 The combination with a telephone circuit, a magnet included in said
circuit, a normally open circuit including the lamp and closed by the forward
movement of the armature of said magnet, a latch to engage said armature
and hold it in its forward position, said latch having a toe to co-operate with
a shoulder on the operator's plug, whereby said latch is operated to release the
armature and open said local circuit when the plug is inserted and again when
the plug is withdrawn, substantially as shown and described
Dated the 19th day of September 1899.