Improved Means or Apparatus for Transmitting Rotary Motion to or from Electric Machines.
Year: 1886

page_text: Date of Application, 1st Oct., 1886.
Complete Left, 24th June, 1887.
Complete Accepted, 30th Aug., 1887
Improved Means or Apparatus for Transmitting Rotary Motion to
or from Electric Machines.
I, JOHN HENRY HOLMES, of 67 Westgate Road, Newcastle-on-Tyne, in the
County of Northumberland, Electrical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improved means or apparatus for transmitting motion to
or from the shaft that carries the armature or rotary part of any electric machine,
as, for instance, to the main shaft of a generator or from the main shaft of an
electric motor to any other apparatus required to be driven therefrom and has for
object to relieve such shafts and their bearings from the lateral or transverse strain to
which they are subjected when the motion is conveyed directly through gearing of
which one of the wheels is fixed upon the main shaft of the electric machine.
To this end according to my invention the motion is transmitted through a pulley
mounted upon an adjustable counter shaft connected to the shaft of the electric
machine not rigidly but by a drag link or other suitable device such, for examples,
as a slot and a pin or a spring. Thus an arrangement according to my invention
as applied to the driving of a dynamo or an electric generator by means of an
engine is as follows:-
The engine and dynamo or electric generator are mounted upon a common base
plate or frame.
The counter shaft is carried by an arm or a frame moveable about a pivot or axis and
the pulley on the countershaft is driven by frictional contact with a wheel on the engine
shaft, the degree of pressure between the two being regulated by a screw-threaded
rod and nut, and a yielding pressure being obtained by the use of an interposed
spring. The armature shaft and countershaft are so relatively arranged that when
DO17

page_text: in position for driving their axes shall coincide as nearly as possible, and their
adjacent ends are provided with discs or plates connected by a drag link. By this
arrangement the lateral thrust due to the pressure between the wheel, on the engine
shaft and the pulley on the counter shaft is taken by the arm or frame that carries
the countershaft, and the armature shaft and its bearings are thereby relieved of
such thrust.
As will be obvious, the action of the arrangement is reversible, that is to say,
the dynamo electro machine, instead of being a generator of electricity, may receive
a current and act as a motor for driving other machinery through the means above
described.

page_text: שבע -
Improved Means or Apparatus for Transmitting Rotary Motion to
or from Electric Machines.
I, JOHN HENRY HOLMES, of 67, Westgate Road, Newcastle-on-Tyne, in the
County of Northumberland, Electrical 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 :-
This invention relates to improved means or apparatus for transmitting motion to
or from the shaft that carries the armature or rotary part of any electric machine,
as, for instance, to the main shaft of a generator or from the main shaft of an electric
motor to any other apparatus required to be driven therefrom, and has for object to
relieve such shafts and their bearings from the lateral or transverse strain to which
they are subjected when the motion is conveyed directly through gearing of which
one of the wheels is fixed upon the main shaft of the electric machine.
To this end according to my invention the motion is transmitted through a pulley
mounted upon an adjustable counter shaft connected to the shaft of the electric
machine not rigidly but by a drag link or other suitable device such, for examples, as
a slot and a pin or a spring, (all included hereinafter in the expression "Hexible
coupling"). Thus an arrangement according to my invention as applied to the
driving of a dynamo or an electric generator by means of an engine is as follows :-
The engine and dynamo or electric generator are mounted upon a common base
plate or frame, or are otherwise relatively fixed.
-
The counter shaft is carried by an arm or a frame movable about a pivot or axis
and the pulley on the counter shaft is driven by frictional contact with a wheel on
the engine shaft, the degree of pressure between the two being regulated by a
screw-threaded rod and nut, and a yielding pressure being obtained by the use of an
interposed spring. The armature shaft and counter shaft are so relatively arranged
that when in position for driving, their axes shall coincide as nearly as possible, and
their adjacent ends are provided with discs or plates connected by a drag link. By
this arrangement the lateral thrust due to the pressure between the wheel on the
engine shaft and the pulley on the counter shaft is taken by the arm or frame that
carries the counter shaft, and the armature shaft and its bearings are thereby relieved
of such thrust.
As will be obvious, the action of the arrangement is reversible, that is to say, the
dynamo electric machine, instead of being a generator of electricity, may receive a
current, and act as a motor for driving other machinery through the means above
described.
Referring to the accompanying drawing,
Fig. 1 is an elevation of an engine and a dynamo with means according to this
invention for transmitting motion from the engine shaft to the dynamo shaft for the

page_text: Fig. 2 is an elevation of the same at right angles to Fig. 1.
Figs. 3, 4, and 5, are detailed views illustrating modifications of the connection
between the counter shaft and the dynamo shaft.
A is an engine, and B a dynamo electric machine both mounted upon a common
bed plate or frame C. D is a counter shaft carried by bearings in a bifurcated
frame E pivotted at F. On the shaft is a pulley G, and a disc or plate H. The
pulley G is driven by frictional contact with a wheel I on the engine shaft J. Kis
a rod connected at one end to the engine frame, and screw-threaded at its other end;
it passes through an eye at the upper end of the frame E, and is provided with
nuts L, L, on its screw-threaded portion, and with a spring M interposed between the
nuts L'and the frame E as shown. By this arrangement, a yielding pressure can be
maintained between the pulley G and the wheel I, and the degree of pressure between
the two can be regulated according to requirement. N is the dynamo armature shaft
carried in suitable bearings O, O, and provided at its end adjacent to the counter
shaft D with a disc or plate P. The axes of the counter shaft and the armature shaft
should be arranged to coincide, as nearly as possible, when the pulley G is in its
driving position relatively to the wheel I. Q is a drag link pivotted at one end to the
disc or plate H, and at its other end to the disc or plate P. By this arrangement
the armature shaft may be driven by the engine without it and its bearings being
subjected to lateral or transverse strains.
Figs. 3 and 4 are elevations at right angles to each other, illustrating a modified
arrangement for connecting the discs or plates H and P. In this arrangement, the
drag link is dispensed with, and the disc or plate P carries a pin R that takes into
a block S capable of sliding in a slot T formed in the disc or plate H. D is the
counter shaft, and N the armature shaft arranged as before.
In Fig. 5, the armature shaft N is arranged to be driven from the counter
shaft D by a spring U connecting the two.
Having now particularly described and ascertained the nature of the said invention,
and in what manner it is to be performed, I declare that what I claim is
1. For transmitting rotary motion to or from the armature of an electric
machine, the application and use of a pair of frictional wheels or pulleys whereof one
is mounted on a shaft connected by a flexible coupling to the armature of the electric
machine and capable of being moved to bring the said frictional wheel or pulley into
engagement with the other
or corresponding wheel or pulley, substantially as
described and for the purposes specified.
2. The combination with a motor and an electric machine erected on the same bed,
or otherwise relatively fixed, of a pair of frictional wheels or pulleys of which one is
mounted on a shaft connected to the armature of the electric machine by a flexible
coupling, and capable of being moved to bring the said frictional wheel or pulley into
engagement with the corresponding wheel or pulley, substantially as described for the
purposes specified.
3. The combination of motor, driving apparatus, and electric machine, arranged
and operating substantially as described with reference to Figs. 1 and 2 of the
drawings.