Improvements in Electro-motors.
Year: 1890

page_text: Date of Application, 21st Aug., 1890-Accepted, 6th Dec., 1890
Improvements in Electro-motors.
I, Ross FRANKLIN MOORE, Major R.E., of 39 Brigstock Road, Thornton Heath,
in the County of Surrey, 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 this invention is to obtain a light and efficient motive power.
The invention consists in two electro-magnets A, A, B, B', of the horse-shoe form
fixed on the ends of a pair of spiral springs C (as shown on the drawing
Sheets 1 and 2.
The electric current is made to alternate in one of the electro-magnets by means of
the commutator D fixed and connected as shown in Sheets 1 and 3.
By the alternating attractive force and repulsive force exerted between the two
electro-magnets A, A, B, B', in their magnetic fields the spiral springs Care
caused to oscillate in unison. A certain number of strokes per minute are given,
varying with the strength of the electric currents also the length and strength of the
spiral springs CC.
A pair of spiral springs CC is recommended as being the most convenient number
to suit the two arms of the horse-shoe form of the electro-magnets.
The electro-magnets are each made of two hollow cylinders e e' ff' of soft iron
fastened to plates g g of the same iron as a cross plate.
The two cylinders and cross plate form one magnet.
Holes are cut in the cross plate of the upper electro-magnet to admit of the spiral
springs passing freely through the cylinders
The upper pair of cylinders is coated inside with a composition of pitch and gutta-
percha or other suitable insulating substance and a covering of leather so as to insulate
it electrically from the spiral springs in case of accidental contact.
The upper electro-magnet is suspended and secured to the spiral springs by any
suitable means. In the drawing a strong cross bar is shown passing through the
coils of the spiral springs. The electro-magnet is clamped to this by an insulated
cross bar and a strong cramp j.
The lower electro-magnet B is hooked on by the screw bolts k¹ to the end loops
of the spiral springs CC. The screw bolts k¹ pass through the connecting plate
at the base of the cylinders.
The cylinders are wound with insulated wire as usual for electro-magnets.
The commutator D may be of any ordinary form suitable for changing the contacts.
The armature of the commutator is attracted one way by an electro-magnet n and
pulled the other by a string attached to the lower electro-magnet.
The commutator shown in Sheets 1 and 3 consists of a cylinder of soft iron l
attached to an arm which works an axle m. The electro-magnet n when it attracts
the soft iron armature causes the axle to revolve sufficiently to change the contacts.
A string attached to the lower electro-magnet and the armature pulls the armature
back on each downward stroke of the electro-motor. The string has to be adjusted for
the length of the stroke required. The current for the commutator electro-magnet is
completed by the electro-magnets A A' and B B₁ making contact between each other
at each stroke. Their edges may be silvered or platinised to ensure clean contact.
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A current then passes from the battery Z through the coils of the magnet n.
the battery which supplies the magnets A A'; it is permanently connected with
insulated metallic plates d¹ d² on the axis of the commutator by means of brushes
connected with q and r resting on metallic rings around the axis. When the com-
mutator rocks other brushes o and p (insulated from q and r) alternately come into
contact with the plates d². By this arrangement the electric current which enters

page_text: at d' and passes out at o and s when the armature is attracted by the electro magnet n
passes by p&t when the armature is pulled by the string. The line is the coil
d¹
round the upper electro magnet.
The electrical batteries and their connections are shown in
No. 1). The battery X is permanently on to the magnets B B¹.
shown but one might work the whole system.
the diagram (Sheet
Three batteries are
It may be noticed that extra battery power is provided for the electro-magnet whose
current is reversed by the commutator on account of the extra resistance caused in
effecting the change.
One of the magnets can be a permanent one instead of an electro-magnet, also the
current might be sent in only one direction and broken for each down stroke. This
latter arrangement can be effected by the current passing one current through both
electro-magnets for attraction only.
By reducing the length of the spiral springs above the motor the number of
strokes per minute will be increased but the throw reduced. The spiral springs can
be done away with altogether above the magnets if desired.
Any number of springs of suitable strength from one upwards can be used in
the arrangement, also any number of magnets threaded or fixed on one or more
springs to form a combined system.
Spiral springs can be fixed inside the cylinders of the electro magnets and be used
in compression. If convenient the motor may be reversed and the spiral springs
outside the motor used in tension. The power would be imparted from the motor by
a lever or other suitable mechanical means. The length of the stroke could be
increased by increasing the number of motors used in the combination.
Any electrical current generator of suitable power may be used for the motor.
It is claimed for this invention that it is a very light form of electro motor for its
power and one that economises the electric current.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Attaching magnets electric or other to a spring or springs so that they may
work in unison with the spring or springs when suitable electrical currents are passed
through the coils of the electro-magnet or magnets and so form an electro-motor or
electro pendulum capable of performing work substantially as described.
2. An electro motor substantially as herein described.
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