Improvements in Electric Motors.
Year: 1896

page_text: Improvements in Electric Motors.
I ARTHUR GREENWOOD of Albion Works, Leeds, in the County of York, Engineer
do hereby declare the nature of this invention to be as follows:-
The object of the present invention is to provide a compact and simple construction
of electric motor, which, although completely encased, will be readily accessible,
for the purpose of removing, when injured, the magnet coils, cores, and pole pieces,
without disturbing the armature, and renewing and replacing any injured parts.
For this purpose I provide, in substitution for the ordinary framework, a
rectangular casing, with a central opening in the sides thereof. One of these
openings is sufficiently large to allow of the insertion of the armature and its shaft,
and the other suffices for the projection of the shaft through the opening. This
opening is covered by a plate which carries the bearing for one of the journals of
the armature shaft, and it is secured in its place by bolts. The larger opening in
the case is surrounded by a cylindrical extension of the case, which cylindrical
extension is fitted with a bearing for the other journal of the armature shaft.
A brass cover serves to close this cylindrical extension of the case. The top of the
case has a detachable cover, pendent from which is the core and pole piece of a
field magnet. This cover is made fast by screws, and, should any injury occur to
the core, pole piece, or coil surrounding the core, the defect may be remedied, on
removing the cover from its place. The same arrangement is provided at the hottom
of the case, and for the like purpose. Fitted to the armature shaft is the usual
commutator, and in contact with the commutator are carbon brushes pendent from a
yoke, which is made fast to the bearing carried by the cylindrical extension of the
case.
The bearings are each formed with an oil reservoir below the journal, and the
brasses are cut away on their upper side, to expose a portion of the journal. Upon
this exposed portion a ring is hung, which dips into the cil reservoir, and thus
automatically supplies oil to the rotating journal.
The electric conducting wires are arranged in the usual manner for ensuring a
rapid rotation of the armature shaft.
Externally of the casing, the armature shaft may be fitted with a spur pinion,
which gears into and drives a spur wheel keyed to the driving shaft of the motor.
This shaft has its bearings in the side of the case, and in a supplementary casing
provided for enclosing the gearing.
Thus, the whole of the motor mechanism is enclosed, and all liability of its injury
from exposure is avoided, without the disadvantages of inaccessibility. to the various
parts of the motor.
The casing may, if desired, be water jacketted, or otherwise provided with means
for reducing the heat developed by the motor.
Dated this 21st day of March 1896.
NEWTON & SON,
Agents for the Applicant.

page_text: Improvements in Electric Motors.
I ARTHUR GREENWOOD of Albion Works, Leeds, in the County of York, Engineer,
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 present invention is to provide a compact and simple construction
of electric motor, the exterior of which forms a casing that encloses the field magnets
and armature, in such a manner as to allow of ready access to the interior thereof,
for the purpose of removing, when injured, the magnet coils, cores, and pole pieces,
without disturbing the armature, and renewing and replacing any injured parts.
For this purpose, I provide, in substitution for the ordinary framework, a
rectangular casing of iron, constructed as shown in the accompanying drawing, where
Fig. 1 is a side elevation of the motor, and
Fig. 2 is a cross section of the same, taken on the line 1-2 of Fig 1.
AA is the casing, which carries the bearings for the shaft B of the armature C.
A'A' are central openings in the opposite sides of the case A. The opening A' is
formed by a sleeve extension of the casing, and it is made sufficiently large to allow
of the insertion of the armature and its shaft, and the opening A² suffices for the
projection of the shaft through the opening.
This opening is covered by plate A³, which carries the bearing a for one of the
journals of the armature shaft B, and it is secured in its place by bolts. The
larger opening, A', of the case, is fitted with a bearing a' for the other journal of
the armature shaft. A brass cover A serves to close the sleeve or cylindrical
extension of the case. The top of the case has a detachable cover A, pendent from
which is the core and pole piece D of a field magnet. This cover is made fast by
screws, and, should any injury occur to the core, pole piece, or coil surrounding the
core,
the defect may be remedied on removing the cover from its place. The same
arrangement is provided at the bottom of the case, where A is a detachable cover
carrying a core and pole piece D', and designed for the like purpose. Fitted to the
armature shaft B, is the usual commutator E, and in contact with the commutator are
carbon brushes FF, pendent from a yoke G, which is made fast adjustably to the
bearing a carried by the cylindrical extension of the case. These brushes are
held in contact with the commutator by means of a tension spring fin connection
therewith.
The bearings a a¹ are each formed with an oil reservoir below the journals, and
the brasses are cut away on their upper side, to expose a portion of the journals.
Upon these exposed portions, a ring 6 is hung, which rings dip into their respective oil
reservoirs, and thus automatically supply oil to the rotating journals.
The electric conducting wires are arranged in the usual manner for ensuring a
rapid rotation of the armature shaft.
Externally of the casing A, the armature shaft B is fitted with a spur pinion b₁₂
which gears into and drives a spur wheel keyed to the driving shaft H of the motor.
This shaft has its bearings in the side of the case A and in a supplementary casing A*
provided for enclosing the gearing, and bolted to the main casing A.
Thus, the whole of the motor mechanism is enclosed, and all liability of its injury
from exposure is avoided, without the disadvantages of inaccessibility to the various
parts of the motor.
The casing may, if desired, be water-jacketted, or otherwise provided with means
for reducing the heat developed by the motor.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I wish it to be understood that
I make no claim to novelty in respect of the field magnets or armature, but what I
claim is:-
1. The means above described for enclosing the working parts of the electric
motor, and, at the same time, providing a ready access to every part thereof, for the
purpose above explained.
2. Mounting the carbon brushes in the enclosing case of the electric motor as
above described.
NEWTON & SON,
Agents for the Applicant.