Improvements in Electric Signalling Devices for Telephone or similar Circuits.
Year: 1894

page_text: Date of Application, 13th Feb., 1894--Accepted, 14th Apr., 1894
COMPLETE SPECIFICATION.
Improvements in Electric Signalling Devices for Telephone or
similar Circuits.
I, REGINALD HADDAN, of the Firm of Herbert Haddan and Co., of
18, Buckingham Street, Strand, W.C. London, Patent Agent, do hereby declare
the nature of this invention a communication to me from abroad by Alexander
Scott Williams, of New York, N.Y., United States of America, Manufacturer,
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :-
This invention relates to an improvement in signalling devices and the invention
consists in the novel features of construction set forth in the following Specification
and claim and illustrated in the annexed drawing in which
Figure 1 is a diagram of the signalling device with the switch in one position.
Figure 2 shows the switch in another position.
In this drawing the letter A. indicates a lever or switch somewhat similar to a
telephone switch, said switch being jointed or fulcrumed at B and provided with a
spring C and hook D onto which latter the receiver is hung to draw or move the
switch against the action of spring C. Said switch is made of insulating material
and is provided with metallic or conducting strips E F G. An arm or hora H
projects from the switch.
The weight of the receiver suspended from hook D will draw or move the switch
against the force of spring C and carry the strip E under or into contact with the
fingers or springs IK (Fig. 2). At the same time the horn H pressing on the
finger or spring L will force the latter into contact with the strip M. The tendency
of spring L when free is to move away from strip M so as to break contact with the
latter as seen in Fig. 1.
From the finger or contact piece L extends a conductor N to conductor O
connecting by conductor P with a pole of battery Q. From the other pole of
battery extends a conductor R to conductor S united to conductor T by a spring
jack U V the use of which is hereinafter set forth.
The conductor T has a circuit breaker W which is normally closed but which
can be opened by a push button X. The conductor T extends to contact K.
From contact I extend conductors Y Z joined by a circuit breaker a normally
closed but which can be opened by push button b. The conductor Z connects by
conductor c with electro magnet d connected at e to electro magnet f from which the
conductor g extends to conductor P.
The electro magnets d f are designed to actuate an electric alarm having
hammer h and belli. The circuit breakers W a being closed and the switch A in the
position shown in Fig. 2 the current from battery Q will pass through
conductors R S T, contacts KEI conductors Y Z c and through the electro
magnets df and conductors 9 P back to battery Q, said current permanently
vitalizing the electro magnets df so as to hold the bell hammer h fixed or motionless
as the latter is permanently attracted or held to magnets d f by the means of
battery Q. In case the circuit from battery Q is broken as by actuating push
button X or 6 the magnets d f are devitalized and the hell hammer h moves or
drops into contact with the arm or spring k from which conductor / extends to
battery m the latter being joined by conductor n to contact M.
The current from battery m then passes through conductor / to contact k and
through the bell hammer and conductor c through the magnets d f and
conductors 90 N through the contacts L M and conductor n to battery m.
passing through the magnets df the current from battery m vitalizes said magnets
In

page_text: so as to draw hammer h away from contact k causing said hammer to strike or sound
belli. As soon as the hammer h leaves the contact k the current from battery m
is broken and the magnets df are devitalized so that the hammer returns to contact k
thus again closing the circuit. The hammer h thus keeps vibrating and sounding
the bell i. When the telephone is taken off the hook D the spring C moves the
switch A and horn H so as to free the spring L which latter now breaks the
contact by moving away from the piece M as seen in Fig. 1 thus stopping the sounding
of alarm i.
The movement of switch A by spring C also brings the strips or contacts FG
The finger
and
P
respectively under or into touch with the springs or fingers o q r.
or contact o is connected by conductors with the contact K or conductor T. The
finger or contact p is connected by conductor t with the telephone receiver A' which
as already noted when not in use is suspended from hook D.
From receiver A' extends conductor B' about induction coil C¹ and thence to
conductor O. The conductor F1 is also wound about coil C¹ in the usual manner
and connects the coil C¹ with the telephone transmitter G' from which latter extends
conductor H to the local battery in. A conductor I connects battery m and
contact piece q and a conductor Ď' connects contact piece and coil Č¹. The
coil C¹ forms the induction coil for the transmitter G¹.
A plug key K' is connected by the conductors or connection L' to a trans-
mitter M. By introducing the plug key K' into the spring jack UV the
transmitter M can be inserted or looped into the circuit of the conductors ST.
A plate or tag a' such as that of an ordinary hotel annunciator is provided with
a contact b¹ which when the tag a' is raised or out of sight is out of contact with
the bar or conductor c¹. This contact b¹ has a conductor d' extending to the alarm e¹
from which conductor extends to local battery g connected by conductor
the bar c'.
to
The operation of the device is as follows: The contacts W a being closed and
the tag a¹ raised out of sight the current of battery Q through conductors RSTYZ
will permanently or continuously vitalize the magnets d f to hold the hammer h at
rest and the contact b₁ being out of action the current through conductor d' is
broken so that the alarm e¹ is at rest. By breaking the circuit of battery Qas
occurs either on the actuation of button X or 6 the hammer h will be freed and will
drop or move to contact k so as to close the circuit from battery m and the hammer /
now begins to sound the call bell i. At the same time the actuation of button X
or b will cause the annunciator tag a' to drop so that contact closes the circuit of
battery g' and the alarm or call bell e¹ is actuated.
On now taking the receiver A' off hook D the contact F will move into touch
with contacts op thus bringing the receiver A¹ into connection with conductor T.
At the same time the plug key K' being inserted into spring jack U V will bring
the transmitter M' into connection with conductor T. The receiver and
transmitter A' M' are thus brought into communication as the circuit is closed
through parts A' tp FosTV K L M U SRQ POB C' A¹.
The transmitter G' is connected with the circuit of the receiver A' through the
means of coil C₁as the conductor F' from the transmitter connects with or extends
about the coil C' about which coil also winds the conductor B'. Said coil C₁ is
connected to the local battery m by conductor D' and contacts r G q, the
conductors IH F¹ completing the local circuit.
A receiver can also be inserted into the circuit in proximity to the transmitter M
in any well known way but I have found it simpler to use the part M' both as
transmitter and receiver.
The tag a' is held up by any suitable magnet permanently vitalized by the use of
battery until the circuit from said battery Q is broken by either push
button X or b.
This arrangement is useful in its application to various localities such for
example as hotels. The call bell button and switch A with its adjacent
mechanism being placed in a room and the button X part M' and annunciator a

page_text: with call bell e¹ being placed in an office, the actuation of either button b or X will
actuate the call bells i e', and the removal of receiver A' from hook D and insertion
of plug key K¹ into its spring jack U V will establish communication between
parts A M
As the wires or conductors P T are now found in hotels or places having electrical
annunciators, such wires can be used for establishing the required connection without
any rewiring or extraordinary labor being required.
The plug key K' instead of being inserted into spring jack U V can be inserted.
into spring jack U₁ V₁ of the conductors S₁ T' leading from battery Q' to a
different room
or locality than the conductor T, said wire S₁ having its
annunciator a² and contact 12 to close the circuit of local battery g' so that the
transmitter M can be used for signalling or sending communications to various.
points. By making the bar or contact c¹ of sufficient length or by uniting a
number of such bars or contacts in series a large number of annunciator tags with
their respective circuits can be applied or grouped in a convenient locality. When
an annunciator tag falls into contact it is noticed the alarm el keeps sounding
even after the main circuit is closed until said tag is again raised by an attendant.
or person answering the call so that the alarm e' cannot fail to attract attention.
Having now particularly described and ascertained the nature of the said.
invention and in what manner the same is to be performed I declare that what I
claim is-
1. The combination with a main circuit and battery Q, a local circuit and
battery m, an alarm i, in said local circuit, a receiver A' and a transmitter G' of a
switch for shifting the local circuit from said alarm to the transmitter substantially
as described.
2. The combination with an alarm i, a main circuit and battery Q for retaining
the alarm and a local circuit and battery m for actuating said alarm, of a circuit
breaker as W for disconnecting the main line from the alarm while leaving the
local circuit connected therewith, a receiver A¹, a transmitter G', and a switch for
shifting the main and local circuits to said receiver and transmitter substantially as
described.
3. The combination with a main circuit and battery provided with circuit.
breakers as W a located at different points and a local circuit and battery of an
alarm connected to said circuits, à receiver, a transmitter and a switch for
shifting the circuits from the alarm to the receiver and transmitter substantially as
described.
4. The combination with an alarm i of a main circuit and battery Q for holding
the alarm out of action, a local or actuating circuit and battery m for the alarm, a
circuit breaker for disconnecting the main circuit from the alarm and leaving the
local circuit free to actuate the alarm, a receiver, a transmitter and a switch for.
shifting the main and local circuits to the transmitter and receiver substantially as
described.
5. The combination with a switch or lever A provided with a horn or projection H.
and with contacts E F G of a spring finger L, contact M and contacts I K, said
spring finger being adapted to be pressed into connection by the horn H and said.
contacts IK being adapted for connection by contact E when the switch A is in
one position, and contacts o p and q r adapted to be connected by the contacts FG
when the switch A is shifted substantially as described.
CL
2004