Improvements relating to Two Pole Dynamos, Motors, and the like.
Year: 1893

page_text: Date of Application, 4th Aug., 1893
Complete Specification Left, 4th May, 1894-Accepted, 9th June,
1894
PROVISIONAL SPECIFICATION.
Improvements relating to Two Pole Dynamos, Motors, and the like.
We, FRANCIS MURRAY NEWTON, and TOM HAWKINS, both of The Newton
Electrical Engineering Works, Taunton, Electrical Engineers, do hereby declare
the nature of this invention to be as follows:-
Our invention relates to two pole dynamos and motors and such like electrical
apparatus. In such machines there is a difficulty in removing the armature which
has usually to be threaded or carefully passed horizontally through the core of
the magnets. The main objections to this are firstly that the machines must be
spaced far enough apart to admit of the withdrawal horizontally of the armature,
when required, and therefore they cannot be placed close together, hence waste of
space which is often an important consideration. Secondly the clearances between
armatures and magnets being small there is serious liability in large machines
especially, of damaging the armature in removing or replacing it. Thirdly,
before the armature can be moved horizontally in or out, its shaft bearings have
to be removed and also if desired to remove the field magnet coils both armature
and bearings must first be removed. The object of our invention is to obviate all
these inconveniences and to enable either armature or field magnet coils to be
removed and replaced readily and easily and by enabling the machines to be
grouped close together to economise space.
For these purposes according to our improvements we arrange one or both of
the field magnets in such manner as to be capable of being slidden to and fro
upon the bed plate. This we effect by means of a suitable screw or screws adapted
to operate the magnet or magnets which are mounted in a slide way as and when
required, said screw or screws being themselves actuated by a ratchet wheel and
lever or otherwise. Thus when required to insert or remove the armature or a
field magnet coil one or both field magnets can be simply receded by the screw or
screws and by simply removing the armature shaft bearing caps the armature can
be lifted vertically and bodily out of its position and so also can either of the
field magnet coils without in any way interfering with the armature or its bearings.
The screw or screws also serve to hold the field magnet in the proper position and
the magnetic circuit is closed through a suitable yoke interposed between the field
magnets.
1000
COMPLETE SPECIFICATION.
Improvements relating to Two Pole Dynamos, Motors, and the like.
We, FRANCIS MURRAY NEWTON, and TOм HAWKINS, both of The Newton
Electrical Engineering Works, Taunton, Electrical Engineers, 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 invention relates to two pole dynamos and motors and such like electrical

page_text: apparatus. In such machines there is a difficulty in removing the armature which
has usually to be threaded or carefully passed horizontally through the bore or
field space of the magnets. The main objections to this are firstly that the
machines must be spaced far enough apart to admit of the withdrawal horizontally
of the armature, when required, and therefore they cannot be placed close together,
hence waste of space which is often an important consideration. Secondly the
clearances between armatures and magnets being small there is serions liability in
large machines especially, of damaging the armature in removing or replacing it.
Thirdly, before the armature can be moved horizontally in or out, its shaft bearings
have to be removed and also if desired to remove the field magnet coils both
armature and bearings must first be removed. The object of our invention is to
obviate all these inconveniences and to enable either armature or field magnet coils
to be removed and replaced readily and easily and by enabling the machines to be
grouped close together to economize space.
According to our invention we provide that the field magnet limbs shall be
capable of being caused to approach to or recede from one another upon the bed-
plate. This we effect by means of a screw or screws adapted to operate the said
magnet limbs which latter are mounted in a slide-way or slide-ways, the said screw
or screws being actuated by a ratchet wheel and pawl or other suitable device for
conveniently rotating a screw. Thus when it is required to insert or remove an
armature or to take off or put on a field magnet coil the field magnet limbs are
caused to recede from one another by rotation of the screw or screws when by
simply removing the bearing caps of the shaft the armature can be bodily lifted
vertically out of its position and so also can the field magnet coils. The said screw
or screws may also serve to hold the field magnet limbs in proper position. A
suitably placed yoke is interposed between the field magnet limbs into or through
which the said screw or screws may pass.
Having now briefly described our invention in general terms so as to define its
scope, we shall now proceed to show specific ways of carrying it into effect; and
for that purpose we shall refer to the accompanying drawings in which similar
letters of reference indicate similar parts.
Figure is a side elevation of a machine constructed under our invention with
the field magnet limbs moved apart. A is the armature and B B₁ are the field
magnet limbs. CC are the field magnet coils and D is the yoke. E is the bed-
plate upon which in this case the yoke is rigidly attached and F is the screw by
means of which the field magnet limbs are moved upon the bed-plate. The spindle
of the said screw is threaded at both ends the thread at one end being a right
hand one and that at the other end being a left hand one. G is a ratchet wheel
and pawl lever by means of which the screw F may be rotated.
Figure 2 is an end elevation of the machine shown in Figure 1.
the armature is omitted.
In this figure
Figure 3 is a side elevation of a machine constructed under our invention which
differs from that shown in Figure 1 merely in that instead of having a single screw
threaded at both ends so that both niagnet limbs are simultaneously moved from
one another it has two screws FF so that one magnet limb alone can be moved
at a time, as for example when it is desired to remove a single magnet coil. In
the drawing two ratchets are shown and one magnet limb is shown as moved away
from its normal position.
Figure 4 is an end elevation of the machine shown in Figure 3 the armature
being omitted as in Figure 2.
The action of our invention is as follows. Let us assume that the magnet limbs
are in their normal position, that is to say in the closed up position which they
occupy when the machines are in action. Suppose now that it be desired to remove
the armature. If the machine be one constructed as in Figure 1 all that is
necessary is to move the ratchet when both magnet limbs will slide on the bed-
plate till they are sufficiently far apart (as in Figure 1) to enable the armature to
be lifted vertically up out of the field space. If the machine be one constructed

page_text: as shown in Figure 3 then both ratchets may be actuated either simultaneously or
consecutively until the magnet limbs are sufficiently far apart to enable the
armature to be removed.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
1. The new or improved construction of two-pole dynamos, motors and the like
by means of which the armature or a magnet coil may be removed or placed in
position substantially as set forth.
2. The specific construction of dynamos, motors and the like set forth with
reference to Figures 1 and 2.
3. The specific construction of dynamos, motors and the like set forth with
reference to Figures 3 and 4.
4. In a carcase for two-pole dynamos, motors and the like the combination of a
fixed yoke, movable magnet limbs and means for causing the magnet limbs to
approach to or recede from one another substantially as and for the purpose set
forth.
5. The improvement relating to two-pole dynamos, motors and the like which
consists in the combination with the parts mentioned in Claim 4 of a bed-plate
fitted with slide ways substantially as and for the purpose set forth.
Dated this ith day of May 1891
J. G. LORRAIN, M. Inst. E.E., M. Inst. M.E.,
Norfolk House, Norfolk Street, Strand, London, W.C.,
Chartered Patent Agent.