Improvements relating to Telephone Call Stations with Automatic Charge or Fee Receiving Devices.
Year: 1895

page_text: Date of Application, 2nd Jan.. 1895-Accepted, 2nd Feb., 1895
Improvements relating to Telephone Call Stations with Automatic
Charge or Fee Receiving Devices.
I, CHRISTIAN ALBERT JENSEN of No. 77 Chancery Lane in the County of
Middlesex England Chartered Patent Agent do hereby declare the nature of this
invention (a communication to me from abroad by Nicolai Jacobsen of No. 4 Lille
Grændsegade Christiania in the Kingdom of Norway) 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 relation to the arrangement of telephone stations with auto-
matic charge or fee boxes; heretofore these devices were usually very complicated
which necessitated the use of a separate source of electricity from the central
station, when the apparatus was to be brought back to its normal position. For
this reason such automatic fee boxes were usually very expensive in use.
This invention is of such a nature, that the apparatus returns to its normal
position when by means of a common call device the usual alternating current from
the central station is sent through the apparatus. Thus the closing or final signal
from the subscriber called on will bring the automatic fee box to its normal
position.
My invention is represented in the annexed drawings wherein Figures 1, 2 and 3
show three different positions of the devices.
C is the line leading to the central station. T the telephone on the call station,
J the conductor to earth and L a conductor connecting the contact arm in the
telephone with the line C. S is a source of electricity, I a conductor leading
from the source mentioned to the earth conductor. R is the other electrode of the
source S.
The conductor I leads from the source S through the fee receiving device. This
device may be arranged in any suitable manner and in the drawings it is represented
by a lever M connected with the conductor to earth. The end of the arm M only
makes contact with the other part of the conductor I, when a coin rests upon the
arm N. To the fee receiver also belongs the electro magnet E arranged in
connection with the conductor L. This electro magnet serves to bring the arm M
back to its normal position, when the connection between the two stations or
subscribers is to be broken, and this is effected in a usual manner by the armature
of the magnet. The call device may also be constructed in any suitable manner
but it must always be arranged in such a way that it makes it only possible to call
up the central station, when at the same time or beforehand the connection (C, L)
between the latter and the telephone call station is broken. For this reason the
call device in the drawings is combined with a lever O normally connecting the
conductors C and L (Figures 1 and 2) but when acted upon its contact with L is
broken and it comes in contact with the second electrode of the source of
electricity S (Figure 3).
In the drawings Figure 1 shows the normal position of the several parts in the
apparatus, Figure 2, the position of the same when a coin is put into the fee box
(this position of the parts being the same before and after the call has been made,
and Figure 3 the position during the calling. It will be understood, that in the
position represented in Figure it is impossible to call on the central station, as
the connection between the source S and earth is broken; but the central station
or a subscriber may call upon and speak with the telephone call station, as the

page_text: automatic fee receiving device has no influence on the connection between the
central station and the microphone at the call station.
When a coin is put into the fee receiving box however, and thereby connection
between the source S and earth is obtained (Figure 2) the central station may be
called upon from the call station. As shown in Figure 3 the conductor is by the
electromagnet broken during the calling so the latter has no influence on the fee
receiving box, no current passing through the magnet E. By using my invention
the following advantages are obtained :-
1. Neither in the central station nor in the telephone call station is a separate
source of electricity necessary to operate the fee receiving box; the induction
apparatus commonly used, which produces alternating currents may be retained.
2. It is possible always to call on and speak to the telephone call station from
the central station.
3. If it should happen that the central station should signal to the call station,
while this latter is in use, or if from some other reason a current should pass through
the line L, this will only cause the fee receiving box to be brought back to its
normal position, while the line in use remains unbroken.
4. When a person has put a coin into the fee receiving box, he may repeat the
signal to the central station if no answer is obtained without this having any
influence on the devices connected with the fee receiving box.
The conductor L need not of course be used as the speaking line, as such may
be arranged parallel with the conductor L. The fee receiver may be constructed
in any suitable way and may be connected with a device for returning the coin
paid in the box if the required connection is not obtained.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be perforined I declare that what
I claim is
In a telephone station with automatic fee receiver the combination with the
source of electricity for the call bell of a conductor and a fee receiving device,
said conductor being arranged in such a way that the circuit cannot be closed
until a coin has been paid into the receiver, and of an electro magnet, serving to
return the fee receiving devices to the normal position, said electromagnet being
arranged in another conductor (for instance the speaking line), which is connected
with the central station line in such manner that this latter connection has to be
broken when the call signal is to be sent to the central station.
Dated this and de
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.