Automatic Apparatus for the Working of Telephone Stations.
Year: 1896

page_text: Date of Application, 5th June, 1896-Accepted, 25th July, 1896
COMPLETE SPECIFICATION.
Automatic Apparatus for the Working of Telephone Stations.
1, EMIL NAGLO, of Koepenicker-Landstrasse, Berlin, in the Empire of Germany,
Electrical Engineer, 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 statement :-
This invention has for its object the simplification of the working of telephone
stations and consists in carrying out by automatic apparatus several of the
operations that have hitherto been effected by hand and which are repeated in
making each connection, such automatic apparatus being brought into action on
effecting a certain manipulation, and being then made to effect a number of
subsequent operations in the required order.
I will describe the said invention with reference to the accompanying
diagrammatic drawing in which
Fig. 1 shews at the left hand two subscribers lines T T running through three
switch boards of a station, and at the right hand a glow lamp board Ġ T, the
several glow lamps 9 g of which serve to give a visible indication of the fact
whether the corresponding line is free or engaged; this is effected in such manner
that the circuit of a glow lamp is closed both by the falling of the indicator shutter
as also by the plugging of a jack of the same number, so that the glow lamp is lit
up as long as the said line is engaged.
Fig. 2 shews at the right hand the speaking instrument of the official
(microphone M telephone T induction coil and microphone battery) and the call
bell battery W B, the continuous current of which is charged to an alternate
current by means of the pole changer P W, if the subscribers have polarised call
bells; to the left hand are two plugs S1 and S2 of an ordinary double cord
connection set with an intermediate ring-off drop S K, and, in the middle is the
before mentioned automatic switch device which will be presently explained.
When a subscriber, for instance T' calls, his indicator shutter K¹ falls at the
switch board I of the station, and bears against the contact wire d; a current then
passes from the glow lamp battery B through the switch lever H which ordinarily is
situated on the contact 2 of the switch apparatus U, and through the glow lamp
board GT lamp g¹ contact wire d, shutter K' and back to the battery. As soon
as the shutter K falls, the official at switch board I raises the rear plug S¹ of one
of his double cords and inserts it into the jack k of his board; the two springs f
and fof the jack k¹ are thus connected together by means of the insulated ring r
of the plug, and as f¹ is connected with the glow lamp and f2 with the battery B,
a second circuit for the current passing through the glow lamp is thus formed;
the latter therefore continues to glow, if the official now raises the fallen shutter Ki
again.
The speaking instrument of the official is now connected as seen on the drawing,
with the double wire line of the subscriber T through H, ends of the plug Si
and through H³k and jack k', as the body k of S' makes contact with the
socket of k¹, and the end s bears against the spring fa so as to separate it from f*,
so that K is cut out of circuit.
The official then announces "here exchange" whereupon the subscriber gives
the number of the required subscriber, such as No. 2.
The official then looks past his switch board to the glow lamp board situated

page_text: some feet away, in order to ascertain whether the line T2 is free or not; he then
answers "free" or "engaged" as the case may be; if it is free he raises his front
plug S2 and inserts it into the jack of the subscriber 2, whereby the glow
lamp g² is lit up as before described.
On the raising of S2 the levers H H pivoted upon the axis a' and with them
the levers H H mounted on H2, turn under the influence of the springs in the
direction of a clock hand, until the pin Z bears against the disc's'; this latter is
fixed to the discs and both are mounted with friction upon the axis a which is
continuously rotated by a motor. As soon as Z moves downwards, the abutment o
will be free and the two discs in following the motion of the axis a, can rotate
in the direction of the arrow. As long as Z bears against s', neither of the springs
and touch their contacts c' and ³.
But the plug S2 is connected through and c for some time with 'the call
battery, the disc s² being made to press the levers and 2 to the right hand until
the corresponding contact springs bear against the contacts and c
Shortly after the insulating piece on again engages with the notch of the
discs, the pin Z falls into the notch e of disc s', and thus stops s¹ and s². In
addition, this motion of Z, that is, of H2 H3 H causes the corresponding contact
springs and to bear against their contacts C and C³ whereby the two plugs
are connected directly with each other through the ring-off drop S K, thus
completing the connection.
When the conversation is finished, the two subscribers ring off, when the
shutter SK will fall; the official then draws the plugs opposite the ring-off drop
out of the jacks, whereby the glow lamps gl and g are extinguished.
The rear plug S₁ fulls upon a lever, not shewn on the drawing, which
automatically raises the shutter again. The front plug S2 falls on the lever H
and turns it and also the levers H H H back into the drawn position, so that the
discs sands can turn a small distance farther until the abutment o bears against
the pin Z, whereby they are stopped again.
For night working, a call bell W is provided which, as shewn, is put in circuit
on bringing lever H upon the contact 3.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
An automatic switch apparatus which for facilitating the working of telephone
stations, is combined with the plug cables for effecting the telephonic connections,
and which carries out several of the operations that are repeated on making each
connection, in particular the inclusion and exclusion of the call bell battery and
the speaking instrument of the official, such apparatus being so arranged as to
be put in action by a certain manipulation of the official, and to carry out
consecutively in the proper sequence and intervals of time the requisite contact
makings and breakings, substantially as described.
Dated this 5th day of June 1896.
ABEL & IMRAY,
Agents for the Applicant.