IMPROVEMENTS IN MAGNETO CALL BELL APPARATUS
Year: 1885

page_text: We HARRY THOMAS OGILVY FRASER of No 15 St James's Street Clerkenwell
London EC. and FREDERICK YOUNG of 189 Goswell Road Clerkenwell London E.C.
in the County of Middlesex, Electricians do hereby declare the nature of our inven-
tion for IMPROVEMENTS IN MAGNETO CALL BELL APPARATUS to be as follows:-
Our Invention relates to improvements in the effect and construction of Magneto
Call Bell apparatus, and is alike suitable for Telegraphic, Telephonic or Domestic
system of communication.
The chief feature of our apparatus is the substitution of a cord chain or other
equivalent, in conjunction with a clock spring, india rubber, or any other suitable
spring, or elastic substance, for rotating the armature of the Generator, in place of
the Geared or Friction wheels or other similar appliances hitherto employed, which
are objectionable because of the necessity of having to turn a handle but more
especially owing to the unpleasant grinding noise they make when being turned.
Our device which likewise, simplitics the construction and economises the manu-
facture is carried out in the following manner.
1. We employ a cylinder, a revolving armature, and a compound Magnet, or
Magnets, similar to those used generally in Magneto call bell Generators, the
cylinder within which the armature is revolved, is clamped between the poles of
the Magnet or Magnets in the usual way.
2. Upon the end of the armature, we affix a pully, having three flanges upon the
pully and between the inner and middle flanges we place a spring, attached to the
pully at its inner end, and secured to the cylinder at its outer end between
the middle and outside flange of the said pully, we attach a cord, chain, or other
equivalent, this cord is wound a sufficient number of times round the pully and is
carried through the wall of the box, within which the Generator is encased; where
it terminates in the end of a wooden or other suitable knob or handle, when in its
normal position the antagonastic tendency of the spring, tightens the cord and
draws the knob against the box, consequently when the knob is pulled outwards
froin the box, the armature is caused to revolve by the unwinding of the cord, and
the spring is drawn tighter round the pully, when the knob is relaxed the spring
expands to its normal position and in doing so revolves the armature in the reverse
direction back to the point from which it was drawn by the cord, the cord is also
rewound on the pully and the knob drawn back against the box as before,

page_text: 3. Another method we can adopt is to wind the cord round the armature, and
attach to the inner end, an india rubber, or metallic spring, or simply a weight, for
the purpose of tightening the knob or handle against the case, thus causing the
armature to revolve in both directions as before described.
4. Another method is to wind an endless cord or chain round the end of the
armature, then through a revolving pully kept tight by means of a spring, when
the armature is to be revolved the cord is simply pulled up and down.
5. An Electric current is induced in the wire surrounding the armature while it
is revolving in each direction, which produces a given number of strokes or blows
with a hammer upon the Bell domes, when a continuous or prolonged ring is
required, the knob at the end of the cord must be drawn out, and released a
sufficient number of times to ring the Bell for the desired period.
6. In order to cut out the generator coil out of the line circuit when it is not in
use, we employ two metallic springs, close to each other, but not in contact, except
when connected by the pressure of the knob against the case.
7. The Iron Base plate of the Electro Magnet of the ringer is secured to the wall
of the case and in contact with the generator magnets, by virtue of which the cores
of the electro magnets are powerfully polarised, passing through and suspended by
the base iron is a stem, free to move up or down, and adjustable by two lock nuts,
one on each side of the base iron, the stem is provided with two projections,
through which pass two pointed centre screws upon which is pivoted the vibrating
armature, the end of the wire of the bell hammer is screwed into the said vibrating
armature and passes freely through a hole in the wall of the casing and terminates
between the bell domes in the ordinary way.
.
8. Another method to produce the most desired effect of vibrating the hammer
between the two bells, is to place the iron base plate of the electro magnet on the
Generator Magnet as before described, but having the ends of the core irons to face
each, other and placing the vibrating hammer attached to a spring the stem of the
said hammer to be a permament magnet between the two cores, now when a
Magnetic Electric current is generated by means of rotating the armature sending
a north and south current through the coils round the core irons alternantly
causing the bell hammer to be attracte by one and repelled by the other as
different polarisations of the said core irons take place.

page_text: строгощению и мазnovw van Dеn аррагатио
We HARRY THOMAS OGILVY FRASER of No 15 St Jaines strect Clerkenwell
London, E.C. and FREDERICK YOUNG of No. 189 Goswell road Clerkenwell
London, EC. in the county of Middlesex Electricians do hereby declare the
nature of our invention for IMPROVEMENTS IN MAGNETO CALL BELL APPARATUS
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
Our invention relates to improvements in the construction of magneto call bell
apparatus and is alike suitable for Telegraphic, Telephonic, or domestic systems of
communication.
The chief feature of our apparatus is the substitution of a cord, chain, or other
equivalent, in conjunction with a clock, india rubber, or any other suitable spring,
or elastic substance, for rotating the armature of the generator in place of the
geared, or friction, wheels, or other similar appliances hitherto employed, which
are objectionable because of the necessity of having to turn a handle but more
especially owing to the unpleasant grinding noise they make when being worked.
Our device, which likewise simplifies the construction an economises the manu-
facture is carried out in the following manuer :-)
-We employ a cylinder, a revolving
armature, and a compound magnet or magnets, similar to those generally used in
the magneto call bell generators.; the cylinder within which the armature revolves
is clamped between the poles of the magnet or magnets, in the usual manner, upon
the end of the armature we afix a pully having three flanges upon this pully and
between the inner and middle flanges we place a spring attached to the pully at its
inner end and secured to the cylinder at its outer end; between the middle and
outside flanges of the said pully we attach a cord, chain, or other equivalent; this
cord is wound a sufficient number of times round the pully and is carried through
the wall of the box, within which the generator is encased-where it terminates in
the end of a wooden or other suitable knob or handle when in its normal position
the antagonastic tendency of the spring tightens the cord and draws the knob
against the box consequently when the knob is pulled outwards from the box the
armature is caused to revolve by the unwinding of the cord and the spring is drawn
tighter round the pully; when the knob is relaxed. or let free the spring expands to
its normal position and in doing so revolves the armature in the reverse direction
back to the point from which it was drawn by the cord; the cord is also rewound
on the pully and the knob drawn back against the box as before another means
we employ to wind the cord round the armature is to attach to the inner end an
india-rubber, or metallic spring or simply a weight for the purpose of drawing the
knob or handle against the box thus accomplishing the same object as in the first
instance when using the clock spring, another method is to wind an endless cord
or chain round the end of the armature then round a pully kept tight.by means of
a spring when the armature is to be revolved the second cord is simply pulled up
or down.
An electric current is induced in the wire surrounding the armature while it
is revolving in each direction which produces a given number of strokes or blows

page_text: with a hammer upon the bell domes, when a continuous or prolonged ring is
required the knob at the end of the cord must be drawn out and released a
sufficient number of times to ring the bell for the desired period.
In order to cut the generator coil out of the line circuit when it is not in use we
employ two metallic springs close to each other but not in contact except when
connected by the pressure of the knob against the box.
The iron base plate of the electro magnet of the ringer is secured to the wall of
the box and in contact with the generator magnets by virtue of which magnets
the cores of the electro magnets are powerfully polarised, passing through, and
suspended by, the base iron is a stem free to move up or down, and is adjustable
by two lock nuts one one each side of the base iron; this stem is provided with
two projections, through which pass two pointed centre screws upon which is
pivoted the vibrating armature. The end of the wire of the Bell hammer is
screwed into the said vibratory armature and passes freely through a hole in the
wall of the box and terminates between the bell domes in the ordinary way.
Another method to produce the most desireable effect of vibrating the hammer
between the two bell domes-is to place the iron base plate of the electro magnet
on the generator. magnets as before and have the ends of the core irons facing each
other and have the vibrating hammer fixed to the end of a permament bar magnet
one pole of which is free to vibrate between the poles of the electro magnet and
the other end secured by a flexible spring. When an electric current is set up, by
means of revolving the armature of the generator, sending a negative and positive
current through the coils round the core irons they cause the permament magnet of
the bell hammer alternantly to be attracted by one and repelled by the other as
different polarisation of the said core irons take place.
DESCRIPTION OF DRAWINGS.
Figure 1 represents a front elevation and figure 2 a transverse section of an
instrument constructed according to our invention figure 3 is an underside view of
the bottom of the case, shewing the "cut out" figure 4-5 & 6 shew various kinds
of springs used to pull back the cord-figure 7 & 8 shew an elevation of a
call Bell.
A. A represent the permament magnets of the Generator-B the revolving
armature-C the pully on which the cord D is wound E. the handle to which
the cord D is attached-the cut out consists of two metal springs G. G. and a
metal spring F on the end of the handle pressing against these 2 springs G. G.
We can also use a single spring in combination with a metal cord.
The connections to the various parts of the instrument are run in groves in the
case and up the insides of the same. The ringer, H. consists of an iron piece I
fitted in close proximity to one poles of the generator permament magnets A. A.
and influced magnetically thereby two coils or bobbins of wire, J. J. having Iron
cores, K. K. are attached to the iron piece I an armature L has a vibratory motion
imparted to it when a current from the magnets is made to pass through the
coils, J. J.-M is a switch on which is hung the Telephone. N. N. are terminals
for attaching the cord connected to the telephone-0. O. are the terminals for
connecting the Line wire and earth connection."
Figure 4 shews a spiral spring and figure 5 shews a weight attached to the end
of the cord for the purpose of pulling back the cord-figure 6 shews a spring
similar to a clock spring-we can also use other means for pulling back the cord
such as a rubber or flat metal spring, &c.
In figures 7 & 8 the Bell coils J. J. are shewn in an horizontal position and are
secured by means of iron angle pieces, O. O. to the ends of one pole of the.
permament magnets, A. A. P. is a permament magnet with one end placed between
the poles of the coils, J. J. and to the other end of the permannent magnet, P. is
securely, fitted a spring Q this spring Q being secured to the brass angle piece R.

page_text: Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what
we claim is
1st The combination of a clock or other spring and a cord, or chain, or other
equivalent for revolving the armatures of magneto generators substantially as
shewn and described in reference to figures 2-4-5 & 6.
2nd In magneto call bells the combination of an electromagnet and vibrating
permament bar magnet substantially as shewn and described in reference to
figures 7 & 8.