Improvements in or relating to Electrical Annunciators, and Pushes or Calling Devices connected therewith.
Year: 1895

page_text: Date of Application, 12th July, 1895-Accepted, 11th July, 1896
COMPLETE SPECIFICATION.
Improvements in or relating to Electrical Annunciators, and Pushes
or Calling Devices connected therewith.
I, JAKOB STAMM, of Carlsstrasse No. 8, Stuttgart, Wurtemberg, Electrician, 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 relates to an improved mode of grouping together the annunciating
electro-magnets of an annunciator with the requisite automatic switches, and of con-
necting the conductors therewith, the arrangement being such that by providing a
third or additional contact-spring or springs in the call pushes, the number of
conductors leading to the annunciator can be considerably reduced, as I shall now
proceed to explain by reference to the accompanying illustrative drawings wherein
Fig. 1 is a diagrammatic view showing an annunciator board with call pushes
constructed and arranged according to this invention,
Fig. 2 is an elevation of one of the annunciator movements which are arranged on
the board, and are numbered from 1 to 40, and which may be arranged together in
groups of any desired number, as for instance, in groups of ten, as shown.
Fig. 3 shows a call push provided with three spring contacts ef g.
The annunciator shown is designed for use with forty rooms or calling places
(hereinafter referred to as rooms) each of which is provided with a push of the
kind shown in Fig. 3, and whose conductors are connected to the annunciator
which is provided with forty movements of the kind shown in Fig. 2, and four
additional electro-magnets a bed, which serve as automatic switches.
In annunciators as heretofore constructed, it is necessary that a wire should
connect each room with the annunciator board, but with annunciators and pushes
constructed according to the present invention, a less number of wires is necessary,
there being, in the example illustrated in Fig. 1, only fifteen wires leading from
the forty rooms required to be connected to the annunciator switch-board.
With
a greater number of rooms the number of wires necessary will diminish in a still
greater proportion, thus with 100 rooms, only 20 wires and with 500 rooms only
76 wires are required to be connected to the annunciator.
As already stated, there is in each room a push (Fig. 3) which is provided with
three spring contacts e f g which are arranged one above the other (for a push),
or one behind the other (for a pull) so that when the top spring contact e is
pressed against the next spring contact f, the current in the top spring contact
will pass through all the spring contacts f of a group of such contacts. If the
spring contact e be now pressed down still further, the spring contact will make.
contact with the bottom or 3rd spring contact g, and the current will pass through
all the spring contacts g of a group of such contacts connected therewith. The wire A
passing from the annunciating electro-magnet 1 of the annunciator, past the rooms,
is branched off and connected to the last or bottom spring g of the pushes at 1ª, 11ª,
21, 31; in the same way the wire B from the annunciating electro-magnet 2 passes
to the bottom springs g of the pushes at 2ª, 12", 22ª, 32; and so on for the succeeding
wires C, D, E, F, G. H, L, K from the annunciating electro-magnets 3; 4, 5, 6, 7, 8,
9, & 10 respectively, the last wire, riz. K, passing to the springs g of the pushes
at 10, 20, 30, 40º.
The windings of the electro-magnets a b c d are normally connected at one end with
the negative pole of an electric generator æ for which purpose each winding. is

page_text: and
connected to the metal holder K of the corresponding electro-magnet, and the several
holders are electrically connected together by the armature springs
contacts o o¹ool and one of them directly with the said negative pole, the arrange-
ment being such that normally there is a complete electric connection between the
negative pole and the contact o" and between the negative pole and the winding of
each electro-magnet as shown. One end of the windings of the electro-magnets 1 to 9
inclusive are connected together and to the contact o¹ by a conductor L; one end of
the windings of the electro-magnets 10 to 19 inclusive are connected together and to
the contact m11 of the electro-magnet a; by a conductor M one end of the windings
of the electro-magnets 20 to 29 inclusive are connected together and to the
contact m of the electro-magnet by a conductor N ; one end of the windings of
the electro-magnets 30 to 39 inclusive are connected together and to the contact m'
of the electro-magnet c by a conductor 0; and one end of the winding of the
last electro-magnet 40 is connected with the contact m of the electro-magnet d by
a conductor P.
The second or other ends of the windings of the electro-magnets 1, 11, 21, 31,
are connected together, and to the bottom contact springs g of the pushes 1", 11", 21",
31, by the conductor A; the second or other ends of the windings of the electro-
magnets 2, 12, 22, 32, are connected together, and to the bottom spring contact g of
the pushes at 2", 12", 22ª, 32", by the conductor B, and so on for the second or other
ends of the windings of the remaining electro-magnets up to 10, 20, 30, 40, which are
connected together and to the spring contacts g of the pushes at 10, 20, 30° and 40°
by the conductor K.
The second end of the winding of the electro-magnet a is connected to the middle
spring contacts of the pushes at 10 to 19" inclusive by a conductor Q; the second
end of the winding of the electro-magnet b is connected to the middle spring
contacts of the pushes at 20° to 29ª inclusive by a conductor R; the second end
of the winding of the electro-magnet c is connected to the middle spring contacts f
of the pushes at 30 to 39 inclusive, by a conductor S; and the second end of
the winding of the electro-magnet d is connected to the middle spring contact f
of the push at 40" by a conductor T, all as shown in Fig. 1. The spring contacts e
of all the pushes are connected together, and, by a conductor U, to the positive
pole of the electric generator a.
The mode of operation is as follows:-
If the contact springs efg of the push at 3ª be pressed together, a current will
pass from the positive pole of the electric generator to the bottom spring g of the
pushes at 3 and 23ª, and thence by the conductor C to the aforesaid second end of
the winding of the electro magnet 3 whereby the armature thereof will be attracted,
and the corresponding shutter caused to fall. Although the second end of the
winding of electro-magnet 3 is also connected with the second end of the windings
of the electro magnets 13, 23, and 33, the armatures of these electro-magnets will
not be attracted, because the return leads M, N, O to the negative pole are
interrupted at m", m" and m³ respectively. If the push say at 26" be pressed,
the current from the top spring e will pass first into the middle spring f, thereof,
and thence through the middle springs of the pushes at 25°, 24, 23ª, 22ª, 21ª, 20"
and conductor R to the second end of the winding of the electro-magnet b, the
armature of which will be attracted, the circuit of the said winding being completed
through the succeeding holders and contacts k, o, u, k, o, l, k to the negative pole
of the battery. By the attraction of the armature against the contact mone
end of each of the windings of the group of electro-magnets 20 to 29 inclusive,
are placed in connection with the negative pole of the electric generator. If the
push at 26 be pressed down still further, a current will pass from the positive pole
also through the bottom spring g of the push to the second end of the winding of
the electro, magnet 26, and thence to the negative pole through the conductor N, the
circuit of which is now closed through the contact m", so that the armature of the
said electro-magnet 26 will be attracted and the corresponding shutter caused to fall.
Now although the conductor F is connected with the second ends of the windings of

page_text: the electro magnets 6, 16, and 36, these electro-magnets will not be energised because
the return leads L M O to which their windings are respectively connected, will be
interrupted at o¹¹ ml and in¹ respectively. In the same way upon operating any
other of the pushes at 1" to 40", only that one of the electro magnets 1 to 40
corresponding to the push will be affected.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An electrical annunciator with appurtenant system of conductors and pushes
or calling devices wherein the annunciating electro-magnets are arranged in groups
such as 1 to 9 inclusive, 10 to 19 inclusive, 20 to 29 inclusive, 30 to 39 inclusive
and 40), the one set of ends of their windings being connected together in groups
adapted to be separately placed in connection with one pole of an electric generator
through armature springs such as 1, 1, 1, 1, and contacts such as m, m', m",
mand o under the control of electro-magnets such as abcd which serve as
automatic switches, the other set of ends of the windings of the annunciating electro-
magnets being connected together in groups such as 1, 11, 21, 31; 2, 12, 22, 32;
10, 20, 30, 40; that are connected with corresponding groups of pushes or
calling devices, the arrangement being such that the conductors extending from the
calling places to the annunciator are considerably less in number than the electro-
magnets, substantially as herein described.
2. The construction of the pushes or calling devices referred to in the preceding
claim, with three or more spring contacts arranged one above or behind, the other,
substantially as herein described for the purpose specified.
3. An electrical annunciator with connected pushes or calling devices of the kind
specified in the preceding claims wherein all the first or top contact springs e of the
pushes or calling devices are connected with one pole of the battery; the bottom or
last springs g of the said pushes or calling devices are connected together in groups,
as for instance the spring at push 1ª with those at pushes 11º, 21" and 31ª; that
at 2" with those at 12, 22, and 32; and so on, these groups of spring contacts 9 being
connected with the other set of ends of the windings of the groups of electro magnets
in the annunciator, as for instance, the group of springs y at pushes 1ª, 11", 21",
31, with the group of electro magnets 1, 11, 21, 31 and so on up to the group of
contacts at 10, 20, 30, 40 which are connected with the group of electro magnets 10,
20, 30, 40; and some of the middle spring contacts f are also connected together
in groups, as for instance those at pushes 10 to 19* inclusive, at 20 to 29ª inclusive ;
and at 30 to 39 inclusive, those groups together with the spring contact f of the
remaining push say at 40*, being connected with the second end of the windings of
the electro magnets, such as a bed, that serve as automatic switches, substantially
as herein described for the purpose specified.
4. The improved electrical annunciator, with pushes and connections, constructed,
arranged and operating substantially as hereinbefore described with reference to and
shown in the drawings annexed.