IMPROVEMENTS IN OR RELATING TO DYNAMO-ELECTRIC MACHINES FOR SUPPORTING THE ARMATURES OF SUCH MACHINES
Year: 1885

page_text: I THOMAS JOHN HANDFORD of 42 Southampton Buildings in the County of
Middlesex, Patent Agent do hereby declare the nature of this invention for
"IMPROVEMENTS IN OR RELATING TO DYNAMO-ELECTRIC MACHINES FOR SUPPORTING
THE ARMATURES OF SUCH MACHINES" 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 provide a firm and rigid support for the
armature shaft, including the armature, commutator, brushes and pulley of a
dynamo-electric machine, whether motor or generator in such a manner as to
obviate the necessity of levelling the machine or the armature thereof, as heretofore
practiced, and at the same time to render the cominutator and brushes more
accessible than has been usual heretofore. These objects are accomplished by
means of a cradle, or frame, consisting of two metallic rods which are firmly
secured to the field magnet, and are rigidly connected with each other by means of
yokes which furnish the bearings for the armature shaft.
And in order that the said Invention may be perfectly understood I shall now
proceed particularly to describe the best method with which I am acquainted of
carrying the same into effect, and in so doing shall refer to the several figures on.
the accompanying sheet of drawings, the same letters of reference indicating
corresponding parts in all the figures.
Figure 1 of the accompanying drawings is a perspective view of a dynamo-
electric machine embodying the invention; Figure 2 is a plan of the cradle of the
same, with the armature, commutator, shaft and "pulley, supported thereby; and
Figure 3 is a diagrammatic view of a dynamo-electric machine having the rods of
the cradle attached to the field magnet by means of lugs, or ears.
In these drawings, F is the field magnet, which is of any convenient form for the
application of the cradle in the manner hereinafter described, the field magnet core
consisting where desirable of a single piece of iron; a is the arbor, or shaft, which
carries the armature A, the commutator or collector C, and the pulley P.
Two metallic bars, or rods, constitute the side rails of the cradle, being of
greater length than the armature, and entering the yokes y y¹ as hereinafter
described. These rods are large and strong enough to give all necessary firmness
of support to the parts sustained thereby, and are provided with nuts n n¹ and
shoulders 8 8¹.
yy are yokes of brass, or other non-magnetic material, perforated at each end
to receive the rods r¹ in the position shown, and containing each a journal-box

page_text: for the shaft a. The yoke y is of convenient form to be brought to a solid contact
with the field magnet in the position shown in Figure 1.
The rods are held in position in yoke y' by set screws b b¹.
In constructing the machine a hole is bored through each of the pole-pieces of
the field magnet, as in Figure 1, or through ears e e¹ bolted thereto, as in Figure 3,
in a direction parallel to the axis of the armature. The rods are then firmly
driven into these holes, in the. direction from right to left as in Figure 2, until
.stopped by the contact of the shoulders 8 8' with the pole-pieces or ears aforesaid,
as the case may be. The yokes, bearing the shaft and its appurtenances are then
placed in position upon the rods r 7, as shown in Figures 1 and 2. The nuts n n¹
are turned up until the yoke y is thereby firmly clamped against the solid metal
of the magnet, or of the ears thereof, as the case may be; and the yoke y¹ is held
firmly in the position shown in Figures 1 and 2 by the set screws b 6. The rods rol
may be supported on or by the pole-pieces of the field magnet in any other suitable
manner. The brushes may be supported in any convenient manner from the
yoke y¹. The frame or cradle r¹, y'y¹ is by this construction firmly held together
in the desired fixed position relative to the field magnet, whether the latter be
levélled or not; so that during the operation of the machine the armature is held
in like immovable position, with all necessary steadiness. And at the same time
the commutator and brushes are in an easily accessible position. If the yokes y y²,
or either of them be made of magnetic material, the machine is still operative, but
less effectively, for in that case part of the magnetism of the field magnet, instead
of passing through the armature, is shunted through these yokes.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I would observe that
I am aware that prior to this invention, dynamo-electric machines have been made
with bars passing through the field magnet, and that dynamo electric machines
have also been made with bars and yokes respectively made of a single piece of
metal and therefore I do not claim such bars or yokes broadly; but I declare that
what I claim is
1st For the support of the armature of a dynamo-electric machine, a quadrilateral
frame, or cradle, whose side rails, being parallel metallic bars, are held in immovable
positions relatively to each other, by means of two horizontal metallic yokes, each
of which being formed in a single piece, is firmly clamped upon both of the said
bars and contains one of the journals of the armature shaft, substantially in the
manner and for the purpose herein before described.
2nd In a dynamo-electric machine, a field magnet whose core consists of a single
piece of iron, in combination with a four-sided cradle, or frame, consisting of the
parallel rods r¹ and the horizontal journal-bearing yokes y y', each of the said
yokes being formed of a single piece of metal and clamped firmly upon one end of
each of the said rods, substantially in the manner and for the purpose hereinbefore
described.
3rd A dynamo-electric machine, in which the field magnet core is formed in a
single piece and in which the armature shaft is journaled in two yokes which are
held in fixed positions, relatively to the field magnet and to each other, by means of
the parallel rods which pass through the said yokes and through the said field
magnet, substantially in the manner and for the purpose hereinbefore described.
Dalhin 15th day of July 1885