Improvements in Electro Dynamic Generators and Motors.
Year: 1887

page_text: Date of Application, 8th Dec., 1887
Complete Specification Left, 10th Sept., 1888
Complete Specification Accepted, 12th Oct., 1888
PROVISIONAL SPECIFICATION.
Improvements in Electro Dynamic Generators and Motors.
I ROGER TATHAM of Moss Lane Iron Works Rochdale in the county of Lancaster
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:-
The invention relates to apparatus in which rotary motion is given to an armature
or its equivalent for the generation of electricity or in which electricity is used to
cause the said armature to rotate.
The armature or its equivalent of such machines is provided with a commutator
which rotates in contact with brushes or suitable conductors and the object of the
invention is to provide means whereby the durability and efficiency of the said
armature is increased.
For the above purposes First. I give to and fro motion to the brushes or conductors
in the direction of the longitudinal axis of the said armature.
Second. I provide carriers and connections whereby the desired motion is imparted
to the said brushes or conductors.
Third. I provide apparatus capable of being thrown into and out of contact with the
commutator for the purpose of truing polishing and maintaining the said commutator
circular in cross section.
1031
J. T. KING,
Agent for the Applicant.

page_text: Improvements in Electro Dynamic Generators and Motors.
I ROGER TATHAM of Moss Lane Iron Works Rochdale in the county of Lancaster
Mechanical 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 apparatus in which rotary motion is given to an armature
or its equivalent for the generation of electricity or in which electricity is used to
cause the said armature to rotate.
The armature or its equivalent of such machines is provided with a commutator
which rotates in contact with brushes or suitable conductors and the object of the
invention is to provide means whereby the durability and efficiency of the said
armature is increased.
For the above purposes First. I give to and fro motion to the brushes or conductors
in the direction of the longitudinal axis of the said armature.
Second. I provide carriers and connections whereby the desired motion is imparted
to the said brushes or conductors.
Third. I provide apparatus capable of being thrown into and out of contact with
the commutator for the purpose of truing polishing and maintaining the said
commutator circular in cross section.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side elevation and fig. 2 an end elevation of as much of an electro
dynamic generator or motor as is requisite to illustrate my invention under the first
and second parts a is the frame, baxle, c commutator, d brushes secured to bars e e¹
free to slide to and fro in bearings f, the rods e are connected together by a band so
as to move simultaneously. worm on the axle & gearing with a worm wheel i. The
worm wheel is secured to one end of a shaft carried in a bracket the other end of
the said shaft is fitted with a worm k, the worm gears with a wheel carried by a
stud on the bracket, a stud m on the wheel jis coupled to the bar e by a connecting
rod n.
The high speed of the axle is thus reduced by gearing so as to impart a slow
reciprocating motion to the brushes d. In this manner the area in contact between
commutators and brushes is continually being varied and practically even and uniform
wearing of the parts is ensured.
Under the third part o is an emery wheel or polisher fitting on a sleeve p so that
it is free to slide to and fro but is prevented from turning thereon by means of a pin
passing through a slot into a diamond thread in the shaft r. The sleeve preceives
motion from the axle by means of toothed wheels s. t pulley on the shaft b, pulley
on the shaft r, belt gearing the pulleys and t together. The gearings and the
gear and are so proportioned that the sleeve p and shaft have different speeds
of rotation thereby causing the wheel o to both rotate and traverse to and fro. Means

page_text: may be and is preferably provided for moving the wheel in contact with the
commutator so that grinding and polishing only takes place when required.
It will be evident that the desired motions may be given to the brushes and wheel
by many forms of gear.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
First. Electro dynamic generators and motors with brushes to which to and fro
motion is imparted for the purpose set forth.
Second. Apparatus for giving to and fro motion to brushes of electro dynamic
generators and motors for the purpose set forth.
Third. The combination with electro dynamic generators and motors of apparatus
for truing and polishing the commutator substantially as set forth.
Dated this 8th day of September 1888.
Per pro J. T. KING,
J. Johnson,
Agent.