Year: 1886

page_text: I WILLIAM PUDDICOMBE GRANVILLE of Ailsa Craig, Fairholt Road, Stoke
Newington in the County of Middlesex Electrician do hereby declare the nature of
this invention to be as follows:-
The object of the Invention is to provide an electric bell with an indicator that does
not require to be put back to a normal position after each time that the bell is rung.
An indicator worked as herein described will indicate from which of two rooms or
places the bell has been rung or if used as a "call" or "signal" apparatus is capable
of giving either one or other of two "calls" or "signals."
For this purpose I make provision for passing the electric current through the coils
of the electro magnet of the bell mechanism either in one direction or the other
according to the signal to be given-and I employ in conjunction with the electro
magnet a permanent bar magnet pivotted at its centre centrally between the magnet
poles. The ends of the bar magnet will by its magnetism be drawn towards the
electro magnet poles one towards one pole and the other towards the other and will
remain indifferently in either one or other of two positions so long as no current is
passing through the magnet coils. When a current passes it will either hold the bar
magnet still firmer in the position in which it before rested or it will repel the poles
of the bar magnet and swing it round until the position of the poles of the bar
magnet have been reversed when the bar magnet will remain held in its altered
position. In this way the bar magnet can be swung through a large arc of a circle
somewhat less than a semi-circle. Preferably I form the electro magnet with a
straight core and just outside the coils which surround it I mount the bar magnet its
pivot being set radially to the core and centrally between its ends or poles. The
poles pieces I make square or flat sided and to extend outwards beyond the coils.
In proximity to one of the sides is placed the soft iron bar or keeper which carries
the bell hammer. The har magnet swings in a plane parallel with another of these
sides and is of such a length that its ends strike against a stop attached to the pole
pieces.

page_text: The polarity of the electro magnet can be changed by one or other of two methods
according to the use to which the bell is to be applied.
1stly by reversing the battery. In this case the electro magnet may be wound with
a single coil.
2ndly by constructing the electro magnet with two separate windings of wire either
wound together side by side, in separate layers, or on separate parts of the core, I
prefer winding the two wires together side by side throughout their entire length and
in this case the top or outer end of one wire is connected to the bottom or inner end
of the other and this junction is connected through the usual armature interrupter
with one pole of the battery. The two remaining ends of the coils are connected to
the bell "pushes" so that one "push" completes the circuit through one coil and the
other. through the other the result being that the current in one case will pass in one
direction and in the other in the opposite direction.
The pivotted bar magnet is made to carry a card or ring of suitable material on
which are marked the two calls or indications either one or other of which will be
exhibited through an aperture in the casing of the apparatus according as the bar
magnet is moved into one position or the other.
Dated this 1st day of November 1886.
CARI MAEL & CO.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Bells and Indicators.
I, WILLIAM PUDDICOMBE GRANVILLE, of Ailsa Craig, Fairholt Road, Stoke
Newington, in the County of Middlesex, 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
-
The object of the invention is to provide an electric bell with an indicator that
does not require to be put back to a normal position after each time that the bell
is rung.
66
An indicator worked as herein described will indicate from which of two rooms or
places the bell has been rung or if used as a call" or "signal" apparatus is capable
of giving either one or other of two "calls" or "signals."
For this purpose I make provision for passing the electric current through the coils
of the electro magnet of the bell mechanism either in one direction or the other
according to the signal to be given and I employ in conjunction with the electro

page_text: magnet a permanent bar magnet pivotted at its centre centrally between the magnet
poles. The ends of the bar magnet will by its magnetism be drawn towards the
electro magnet poles one towards one pole and the other towards the other and will
remain indifferently in either one or other of two positions so long as no current is
passing through the magnet coils. When a current passes it will either hold the bar
magnet still firmer in the position in which it before rested or it will repel the poles of
the bar magnet and swing it round until the position of the poles of the bar magnet
have been reversed when the bar magnet will remain held in its altered position. In
this way the bar magnet can be swung through a large arc of a circle somewhat less
than a semi-circle. Preferably I form the electro magnet with a straight core and
just outside the coils which surround it I mount the bar magnet its pivot being set
radially to the core and centrally between its ends or poles. The pole pieces I make
square or flat sided and to extend outwards beyond the coils. In proximity to one of
the sides is placed the soft iron bar or keeper which carries the bell hammer. The
bar magnet swings in a plane parallel with another of these sides and is of such a
length that its ends strike against a stop attached to the pole pieces.
The polarity of the electro magnet can be changed by one or other of two methods
according to the use to which the bell is to be applied.
1stly by reversing the battery. In this case the electro magnet may be wound with
a single coil.
2ndly by constructing the electro magnet with two separate windings of wire either
wound together side by side, in separate layers, or on separate parts of the core, I
prefer winding the two wires together side by side throughout their entire length and
in this case the top or outer end of one wire is connected to the bottom or inner end
of the other and this junction is connected through the usual armature interrupter
with one pole of the battery. The two remaining ends of the coils are connected to
the bell "pushes" so that one "push" completes the circuit through one coil and the
other through the other the result being that the current in one case will pass in one
direction and in the other in the opposite direction.
The pivotted bar magnet is made to carry a card or ring of suitable material on
which are marked the two calls or indications either one or other of which will be
exhibited through an aperture in the casing of the apparatus according as the bar
magnet is moved into one position or the other.
In order that my invention may be fully understood I have shown in the drawings
annexed two forms in which my combined electric bell and indicator may be made.
In the construction shown at Figures 1 to 4 a straight electro magnet is used and in
the construction shown at Figures 5, 6 and 7 a horse shoe electro magnet.
Figure 1 is a face view Figure 2 a face view with the cover removed and Figure 3
an edge view with the cover in section. Figure 4 is a perspective view of the soft iron
magnet core with its end pole pieces.
A A are the pole pieces, B the soft iron core which connects them. C the insulated
wire coil which surrounds it. In the construction shown the coil is formed from two
wires side by side.
D is the bar magnet turning on a pivot E which is radial to the core of the electro
magnet. F is a ring carried by the bar magnet and having on its face two words or
signals one between the radial dotted lines a, b and the other between the lines b, c.
G is a box cover by which the magnets and ring are covered in. H is a slot in the
face of the cover through which either the signal between the lines a and or between
the lines b and c can be exhibited. I I are screw stops carried by one of the pole
pieces A-the bar magnet rests against one or other of these stops when it is swung
into one or other of its two positions. K is the bell and L the soft iron bar or keeper
which carries the bell hammer. M is a contact spring carried by the bar L and which
normally rests against the contact point N but is drawn away from it whenever the
bar is drawn to the poles of the electro magnet. The pedestal by which the contact
point N is carried is coupled to the upper end of one of the wires of the coil of the
electro magnet and to the lower end of the other wire-the other ends of the wires
are coupled one to a terminal O the other to a terminal P. A third terminal R which

page_text: is always in connection with one pole of the battery is coupled to the spring by which
the bar L is suspended and is so always in electrical connection with the contact
spring M of the make and break mechanism of the bell.
In this way when the battery circuit is completed through one of the terminals O P
the bar magnet will be brought into or held in the position shown in Figure 2 whereas
if the circuit is completed through the other terminal the bar magnet will be moved
into the position indicated by the dotted line A B.
In the apparatus shown in Figures 5, 6 and 7 the construction is the same as in the
apparatus just described except that the electro magnet is of the two coil or horse
shoe form.
Figure 5 is a face view of the apparatus with the cover removed. Figure 6 is a
perspective view of the magnet core with its pole pieces. Figure 7 is a perspective
view showing the position of the permanent bar magnet relatively to the pole pieces.
If the electro magnets in place of being wound with two wires are wound with a
single wire then when the battery is connected in one direction the bell rings and one
signal appears and when connected in the opposite direction the bell rings and the
other signal appears so that for signalling any form of switch capable of reversing the
direction of the current may be used.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. A combined electric bell and indicator in which the electro magnet used for
ringing the bell has working with it a swinging bar magnet which can be swung by
the electro magnet into one or other of two positions according to the direction of the
current passed through the electro magnet coils and so made to exhibit one or other of
two signals whenever the bell is rung.
2. The construction of a combined electric bell and indicator substantially as herein
before described and illustrated in the drawings annexed.
Dated this and doy of August 1887
CARPMAEL & Co.,
Agents for the Applicant.