IMPROVEMENTS IN TRANSMITTING MOTIVE POWER FROM ELECTRO-MOTORS AND APPARATUS THEREFOR
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I CHAIMSONOVITZ PROSPER ELIESON of 7 Drayton Terrace, Leytonstone in the
county of Essex, Electrician do hereby declare the nature of the said invention for
"IMPROVEMENTS IN TRANSMITTING MOTIVE POWER FROM ELECTRO-MOTORS AND
APPARATUS THEREFOR to be as follows:-
My invention relates to improvements in transmitting motive power from electro-
motors and apparatus therefor, the object of the invention being to allow of the
employment of an electro motor for driving machinery, where the speed required is
less than the critical speed of the motor itself, ie, the speed at which a maximumn
of work is performed with a minimum expenditure of current, this being effected
with very little friction.
In carrying out my invention I employ a bar of iron, or other suitable material
to which is rigidly attached a shaft carrying a fly wheel; the said shaft works in
suitable bearings and serves to communicate motion by suitable gearing to the
machinery which is to be driven.
The electro-motor, which may be of any suitable construction, is attached to the
said bar and the armature spindle of the electro-motor is extended and carries
a pinion at its extremity which gears into elongated radial teeth formed on the
upper surface of a circular fixed plate similar to a crown wheel which forms the
base plate of the apparatus; the said shaft passes through the centre of the crown
wheel. The said pinion is adapted to slide on the armature spindle and is provided
with suitable means for fixing the same. The proportion or ratio between the
fixed circular plate or crown wheel and the pinion upon the armature spindle is
determined by the difference between the critical speed of the motor and the speed
required to be given to the driving shaft.
The bar carrying the motor revolves within the circular fixed plate and thus
communicates motion to the shaft carrying the fly wheel. A circular ruil or flange
is cast on, or otherwise attached to the crown wheel, and on the said rail or flange
runs a flanged wheel fixed to the opposite end of the bar to that carrying the pinion
and suitably adjusted. This rail and flanged wheel prevent the pinion from riding
over the surface of the crown wheel.
The teeth of the crown wheel extend from the periphery radially towards the
centro and the pinion is moved upon the armature spindle so that the radius of

page_text: the point of contact between the pinion and the circular fixed plate or crown wheel
can be increased or diminished as required without varying the speed of the motor.
Thus the speed of the shaft can be regulated to any required degree, at the same
time maintaining a constant speed of the motor armature.
By these improvements when it is required to start a machine or the like, the
pinion is moved by the attendant along its spindle into a position furthest from the
centre of rotation, when the greatest amount of power would be obtained with
the smallest degree of speed of rotation, but as the speed of the machine being
driven increases, the pinion is moved inwards along the armature spindle by the
attendant until the desired degree of speed is attained it will thus be seen that
I can augment the power from the centre or driving shaft of the electro-motor by
decreasing the speed of revolution of the shaft at the same time that the armature
of the motor is maintained at a fixed speed.
This method of transmitting power possesses advantages over the methods
hitherto in use as besides the fact that velocity is thereby changed into power it
allows of employing a fly wheel for regulating the shaft and the apparatus is
specially suitable for electrical tramcars for launches, and in fact for any purpose
where electrical motive power is required as it can be governed without impairing
the efficiency of the electro-motor or wasting the electrical current.
Instead of employing a fixed crown wheel as herein before described the same can
if desired be made to revolve, the motor and the bar remaining stationary and the
shaft in this case would be rigidly fixed to the crown wheel and motion be thereby
communicated to the machinery, but I do not prefer to employ this arrangement.
Instead of producing the rotary motion of the driving shaft by means of
a toothed pinion and crown wheel as hereinbefore described I may in some cases
produce the said motion by means of a roller revolving in contact with a plain
surface.

page_text: "
CIFICATION.
I CHAIMSONVITZ PROSPER ELIESON of 7 Drayton Terrace, Leytonstone in the
county of Essex, Electrician do hereby declare the nature of my said Invention
for IMPROVEMENTS IN TRANSMITTING MOTIVE POWER FROM ELECTRO MOTORS
AND APPARATUS THEREFOR and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement:—
"
My invention relates to improvements in transmitting motive power from electro
motors, and apparatus therefor, the object of the invention being to allow of the
employment of an electro motor for driving machinery where the speed required is
less than the critical speed of the motor itself i.e, the speed at which a maximum
of work is performed with a minimum expenditure of current this being effected
with very little friction.
In carrying out my invention I employ a bar or bracket of iron or other suitable
material to which is rigidly attached a shaft carrying a By wheel; the said shaft
works in suitable bearings and serves to communicate motion by suitable gearing
to the machinery which is to be driven.
.
The electro motor which may be of any suitable construction is attached to the
said har or bracket and the armature spindle of the electro motor is extended and
carries pinions at its extremity which gear into radial teeth formed on the upper
surface of a circular fixed plate similar to a crown wheel which forms the base
plate of the apparatus; the said shaft passes through the centre of the crown
wheel. The said pinions are loose on the armature spindle and are provided with
suitable means for fixing the same. The proportion or ratio between the fixed
circular plate or crown' wheel and the pinions upon the armature spindle is
determined by the difference between the critical speed of the motor and the speed
required to be given to the driving shaft as will be well understood by persons
accustomed to make or use machinery of the kind in question, more particularly
after considering the drawings hereunto annexed together with the description of
them.
The bracket carrying the motor revolves within or upon the circular fixed plate
and thus communicates motion to the shaft carrying the fly wheel. A circular
rail or rails or flange or flanges is or are cast on or otherwise attached to the crown
wheel and on the said rails or flanges run flanged wheels at the opposite end of the
bracket to that of the pinions and suitably adjusted. The rails or flanges and
flanged wheels prevent the pinions from riding over the surface of the crown wheel
and the flanged wheels serve at the same time to carry the electric current to the
motor.
The teeth of the crown wheel are arranged from the periphery towards the
centre and the pinions are fixed upon the armaturo spindle so that the radius'of
the point of contact between the fixed pinion and the circular fixed plate or crown
wheel can be increased or diminished as required without varying the speed of the
motor. Thus the speed of the shaft can be regulated to the required degree at the
same time maintaining a constant speed of the motor armature.

page_text: In order to enable my invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawing in which figure 1, is a
plan and figure 2, a sectional elevation shewing an arrangement of my invention
suitable for driving a tram-car or the like. Similar letters in all the figures
represent similar parts.
a, is the bracket rigidly fixed to the shaft b, working in the bearing e, in the
centre of the plate q, hereinafter described; d, is a fly wheel on the shaft b, but
it will be obvious that such By wheel will not always be required; the lower end
of the shaft b, carries a bevil wheel e, such bevil wheel gearing into the bovil
wheels f, and g, which run loosely on the axle h, of the tram-car; each pinion,
and g, is provided with a clutch marked i, and j, respectively; k, is the electro
motor of any suitable construction the armature spindle 2, of which works in the
bearings m, m, of the bracket a; n, n¹, are the loose pinions on the outer end of
the spindle ; o, o', clutches for fixing the said pinions; p, p, are the radial teeth
on the upper surface of the fixed plate q, which forms the base plate of tho
apparatus and is herein termed the crown wheel; the said base plate carries the
bearing c, of the shaft b, as herein before described; r, ?, are the rails or flanges on
the crown wheel g; 8, 8, flanged wheels running on the said rails and carried in
supports t, connected to the cross bar u, or in any other suitable manner; v, hand
wheel for operating by means of the bevil gear w, the screw x, working the
clutches o, and o', of the pinions n, n'; y, weighted fork for keeping the bevil
pinion e, in gear with the bevil pinions f, and g.
By this arrangement the motor k, being started the armature spindle Z, will
revolve and if the pinion n, be fixed by means of its clutch o, operated by the
screw, from the hand wheel v, the said pinion n, will be caused to rotate with
the spindle l, and its teeth being in gear with the radial set of teeth p, the pinion will
revolve around the crown wheel q, rotating with it the motor k, bracket a, and
shaft b, the bevil pinion e, of which will rotate the axle h, of the tram-car in one
direction or the other according to whether the pinion f, or g, is held fixed by its
clutch the revolution of the shaft b, being regulated or steadied by the fly wheel d,
when a fly wheel is employed.
When the motor k, is driven by the pinion n, as hereinbefore described the
greatest amount of power will be obtained with the smallest degree of speed of
rotation. As the speed of the tram-car (or other machine) being driven increases
the pinion n, can be disengaged from and the pinion n', be fixed on the armature
spindle, by the attendant engaging the clutch o'; the pinion n², will be thereby
caused to rotate the motor k, by its teeth being in gear with the radial set of
teeth p', when the required degree of speed will be attained; it will thus be seen
that I can augment the power from the centre or driving shaft b, of the electro
motor k, by decreasing the speed of revolution of the shaft at the same time that the
armature of the motor is maintained at a fixed speed.
This method of transmitting power from electro motors possesses advantages
over the methods hitherto in use as besides the fact that velocity is by my method
changed into power it allows of employing a fly wheel for regulating the shaft and
the apparatus is specially suitable for electrical tram-cars, for launches and in fact
for any purpose where electrical motive power is required as it can be governed
without impairing the efficiency of the electro motor or wasting the electrical
current.
In the drawing I have shewn only two sets of radial teeth but it will be obvious
that more than two series of teeth can be employed each set requiring a separate &
pinion.
Instead of employing a fixed crown wheel g, as hereinbefore described the same
can if desired be made to revolve in which case the motor k, and the bracket a,
would be stationary and the shaft b, would be rigidly fixed to the crown
wheel q, and motion be thereby communicated to the machinery, but I do not advise 5
this arrangement,

page_text: Instead of producing the rotary motion of the driving shaft b, by means of toothed
pinions and a crown wheel as herein before described, I in some cases, especially
where the power exerted is not large, produce the said motion by means of a sliding
friction roller revolving in contact with a plain surface.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
(1). The combination of parts forming apparatus such as is herein described and
used for transmitting motive power from an electro motor by causing the same to
rotate and thereby to rotate a shaft to which it is fixed, the said shaft communi-
enting its motion by suitable gearing to the machinery to be driven substantially in
the manner berein before described.
(2). The means employed substantially as herein described for varying as required
power and speed in the machino which is driven, the speed of the electro motor
remaining constant.
(3). In apparatus for transmitting motive power from an electro-motor the
combination of pinions upon the armature spindle of the electro motor with series
of radial teeth on a disc or crown wheel as and for the purposes herein before
described and represented in the accompanying drawing.
(4). The improved apparatus for transmitting motive power from electro motors
as hereinbefore described and represented in the accompanying drawing.