Year: 1887

page_text: Date of Application, 10th May, 1887
Complete Left, 10th Feb., 1888
Complete Accepted, 10th May, 1888
JOHN ESHELBY, 5 Eden Quay Dublin Chronometer Watchmaker and Electrician,
and EDWIN ESHELBY Ivansville Freshfield, Liverpool Pianoforte Salesman, do hereby
declare the nature of this invention to be as follows:-
The indicators at present in use, seem to be defective, inasmuch as the one giving
a permanent record of the station ringing requires to be set up by attendant at
each call, and the other, not requiring such attention, only gives temporary notice
with no permanent record.
Our improvement is firstly to prevent more than the last disc being down at any
time, and to obviate the necessity of any setting up by the attendant, as the second
station ringing, would set up the one already down, & so on.
And to meet the case of two stations ringing in quick succession, we propose to
give a temporary indication of the last disc raised, by causing it to vibrate a minute
or two and finally to have a simple arrangement, whereby the attendant could clear
the board, if leaving the room for a short time.
We may use either polarised, or soft iron armatures; with the former we prefer a
horse shoe or crescent form of magnet, three of which would be mounted on an axis
through or below the apex of each, alternate poles in succession, having the prongs
or poles extending upwards and sufficiently apart from each other to admit of a
circular chees shaped coil between each, or similar, or straight magnets, with ordinary
electro magnet coils, to produce the same effect.
One coil is in line with its respective station, and through a local relay to one pole
of the battery, the other pole being in connection with all stations; when contact is
made at a station, the magnet over its respective coil is caused to move from say left
to right, (as arranged) closing, the disc, and at the same time engaging an insulated
contact on the axis or otherwise, closing a contact, which in the first position was open,
this contact being in line between the second coil and through the contacts of the relay
to the battery, causing the next use of the relay to pass a current through the second
coil, and lifting the magnet to its first position; when past the centre its gravity would
retain it either side.

page_text: When using soft iron armatures, we mount on an insulated base (preferably as an
inverted pendulum) in front of the cores, on steel springs, or as an ordinary pendulum
over the front of the cores, a light soft iron armature: when this is attracted to the
cores it is retained in that position by a pawl on the armature or extended from it,
of a second coil, engaging it.
We also mount, on an insulated base & extending across the sides of the cores of the
first coils, a light soft iron armature, carrying a contact point, so arranged as to be
engaged by a similar contact point on the first, or end, armature, only on its being
locked forward, and the current through the first coils ceasing, releases the side
armature; but does not complete the contact while the current is passing through the
prime coils.
The line from the battery passing through the second Electro magnet coils, to the
insulated side armature, and when in contact through the first armature to the contact
points of the relay and on to the battery, consequently when the relay contacts are
closed by any succeeding ring, from another station, a current is passed through
the second coils, lifting the pawl, and releasing the one locked down, which would
vibrate for a considerable time. The same station ringing successively would alter
nothing.
The arrangement for clearing the board would be, simply a push button, arranged
to close the line to the relay without having any disc of its own.
The line arrangements would be the same as usual, one terminal of the prime coils
to the battery and the other to its respective push, through the relay coils & from the
push to the general battery wire. The second electro magnet coil line would start from the
battery and passing through the coils to insulated side armature, thence to contact
points on first armature and from there to the relay contacts and back to the battery ;
the bell would ring direct from the relay.

page_text: Improvements in Electric Bell Indicators.
JOHN ESHELBY 5 Eden Quay Dublin, Chronometer Watchmaker and Electrician
and EDWIN ESHELBY Ivansville, Freshfield Liverpool Piano Forte Salesman 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:-
Our improvements consist in making an electric bell indicator automatic; and at
the same time leaving a permanent record of last station ringing and a temporary
indication of the next to the last, so that if the attendant omitted to set up, the disc
down, the next room ringing would effect that purpose, never more than one could be
down at a time, so removing great cause of confusion.
The form, which appears to combine the advantages of cheap construction, with
efficiency in working, is the one we will now describe, and to that end prefer using
soft iron armatures, and electro magnets composed of a single bobbin of wire, with a
core passing through the centre and terminating each end in a cheek of iron forming
respectively the two poles; though we may use double coils, or polarised armatures,
but prefer the following form.
In referring to the drawings the letters are made to represent the same piece
throughout the different figures, except where specified; Fig. 1. being a front elevation.
Fig. 2. the core & cheeks of electro magnet and armature mounted on springs.
Fig. 3. side view of coils, Fig. 4. alternative form for ship's use. Fig. 5. locking for
same. Fig. 6 circuits as joined up.
a a is a flat brass plate, with arm a¹, projecting out at the back, at right angles, b. is
the outside pole of electro-magnet, the core being fixed into the plate; the inside
cheek, then the bobbin and outside cheek 6, are passed over it all being secured by a
screw or nut; the cheek is made with one edge z z, parallel to a line through the
centre of the core, and projecting some distance beyond the coil; they are fixed with
this edge inclined about 40° out of a vertical line and coincident together; d, is a
very light iron armature, the same length as the electro-magnet, and the same height
as the flat of projecting cheek b, with a raised piece, 1, in the centre of top, and is.
mounted vertically on springs s. s. sufficiently stiff to cause it to stand upright steadily,
these springs we prefer to fix a little way up on the inside of the armature, in order
to allow it to bend, to the inclination of the magnet more freely; the disc is mounted
to a stem extending upwards from this Y fig. 2. the lower extremities of the springs
are screwed into a brass bar h, parallel to the armature, and, it is fixed to the back
board by a screw into a vertical slot in the base for purposes of adjustment; a
platinised contact is placed at the upper inside edge t; a second electro-magnet C, C,
preferably smaller in size, and with bobbin of finer wire, to give equal resistance, is
fitted into the same plate, a a, above and parallel to the first; its flat face being inclined
at right angles to the flat face of the first.

page_text: The projecting arm a¹, extends a little beyond the centre of the coils its upper face
being in line with the flat face of smaller coil; e, is a light armature with a projecting
bevelled point or catch in the centre e¹, and connected to the frame a¹, by a light
spring or joint at the back, and resting on a flat strip of brass r, fixed by the same
screw. The cheeks of larger electro-magnet have a fillet extending "immediately 5
over each end of the coil and parallel to the flat face shown in the section p, fig. 2.
A small piece of ebonite or insulating material g, is gripped on the lower edge of
this between the cheeks, and to its centre, is fixed a light spring at right angles
carrying a light armature ff, at the top which works in a recess, the back of which
is the fillet p p. which is insulated from metallic contact with the armature, by 1
gumming on paper or thin card, or a projecting rivet of insulated, material, the outer
edge of this armature carries a platinised tip in the centre of the top t 1 so arranged
as to engage t 2 when the armature d d, is pressed forward or locked down; the centre
of lower edge of armature d is scalloped out to free the head of the screw of small
armature ff.
The joining up of circuits and operation of the apparatus is shown in plan fig. 6.
arranged for 3 stations 1. 2. & 3. respectively. The binding screws are shown at the
bottom, and the wires are to be led from cach, in the usual way to the respective
stations which are shown for convenience at the top; each figure is supposed to be in
communication with its corresponding number, G being the binding screw for general
return wire, connected with all stations in the usual manner. B. T' and B. T² are terminal
screws for the respective poles of the battery.
R is a simple relay as used in pendulum indicators with an insulated contact n. inside
the indicator box, this relay coil is in line with the general return wire and terminates
by contact with the relay frame which is directly connected to one battery terminal B. T'
the insulated contact of relay being joined to a wire or flat copper strip, shown by
dotted line and on which all the pillars h. are screwed.
c, are
One terminal of each coil goes directly to its own binding screw L 1, 2 & 3
respectively the other terminal of coil b together with one terminal of coil
;
conjointly connected L. B. to second battery terminal B. T2, leaving only one coil
terminal of coil c, to be disposed of, and this is joined to its insulated cut out f.f..
It will be seen that when contact is made at either station say No. 1. for illustration,
a current would be passed from battery via B. T' coil b. push 1. general wire and
relay to B. T exciting in its course the first coil b and relay coil: attracting its
armature d which would be locked down by catch of its armature e. when the contact
ceased at the push at the same time the cut out armatureff would fall back and
bring t 1 & 2 in contact. The disc No. 1. say covered with black & white vertical
stripes, would now be drawn aside from its apperture, which would expose say, a red
back ground-we will then suppose No. 3. station inakes contact the same would
follow with its disc as did with the first, but at the same time another current would
be sent from B. T₁ through relay armature being drawn into contact with its insulated
point n. through dotted line to h. No. 1. its t' & ' now in contact through its small
coil c. to B. T exciting it and attracting its armature, e releases its armature d d, whose
springs bring it back to vertical position, to which it settles down after oscillating a
minute or so, again closing up its red back ground and leaving that of No. 3. now
exposed supposing No. 3. now rings again nothing would be altered, as cut out ff
No. 3. would be drawn forward separating its t¹ & tits coil c, could not be operated
on while a current passed its own main coil. Fig. 4 is an alternative arrangement on
the same principle for use where springs would be objectionable, for ships use, for
instance, and is a view of the coils. from the front above. In this case the coil b
performs the same functions as upper coil c in Figs. 1 & 3, but
equal in size
to & placed parallel to it, the inclination of each forming a Y the armature d d is
pivoted between the plate a. a. on one end and a bar W. extending from one coil to
the other, the cut out armatureff is in this case inverted and its contact t' acts
against the lower part of pivoted armature d d so that contact should be maintained
until it is well past the centre when moving only not when at rest against 61, gravity
locking detents may be added one of which is shown in elevation fig. 5. the tail O' is

page_text: soft iron and acts on the cheeks of coil b the head & neck O being heavier keeps it
in position and is lifted by armature d. d. in passing locks it when against the face
of 6' as shown, but when a current passes through coil 6 to the gravity armature is
attracted down by raising detent o allows d d to be drawn forward. This arrange-
ment though only shown in the drawing on one side to simplify, is intended to be used
exactly the same on b¹ the detent of it acting as locking when d d is against the face
of b. A counterpoise may be extended from underneath d d to make it lighter in
action or the disc may be placed on the under side instead of top. The circuits in
this case would be joined up similar to fig. 1 & 3 as shown in fig. 6 viz. one terminal
of 6 would go to line and the other with one of 61 as L B to B T2 fig. 6 the remaining
terminal of 61 would go to the cut out armature ff. The line h. h. would be joined
up to the frame in metallic connexion with armature d d. We likewise furnish a
contact push for the attendant's use in order to release any disc locked down without
putting down any other, this is effected by connecting one wire from the push to
terminal screw E. P. fig. 6 which is joined to the line n. h. h. h. the other to the
terminal screw G the button when pressed would pass a battery current through
whichever coil was prepared for it by its armature being previously locked down and
this would be then released.
By interposing a switch between insulated relay contact n and n¹ the indicator
would, when this switch was opened be converted into electrical replacement, not
automatic, as the relay would not then pass its current through line h h h, each disc
would remain down after using, until attendant's contact push was pressed which
would release any that were locked down simultaneously, such arrangement would be
suitable for very large installations, as Hotels, where two or three bells may ring in
rapid succession.
The bell may be constructed in the same box or outside, and would be joined up in
line between insulated contact n, and B. T', & would ring whenever contact was made
from any station.
We may use discs the same colour as the dial say black, which when locked down
show a white ground, and is suitable for large offices, whereby a head of an office may
summon any departinent from a large room having the indicator visible from different
points. For ordinary house use we prefer, white & black vertical striped discs, with
the apperture in shape of a shield with a red permanent ground at back.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
(1) In an indicator for electric bells the automatic replacement of disc last used
or next room ringing.
(2) In an indicator for electric bells the automatic replacement in combination with
electrical replacement by one disconnection as described.
(3) In an electric bell indicator an inverted pendulum armature in combination with
relay and detaining armature substantially as described.
(4) In an electric bell indicator the electrical cut out in combination with relay and
pick up coils.
Dated this 9th day of February 1888.
JOHN ESHELBY.
EDWIN ESHELBY.