for Applicant
Year: 1896

page_text: w33
GEORGE EDWARD FRANCIS Warren Lane Chapeltown Sheffield Electrician
do hereby declare the nature of this invention to be as follows:-
It consists of a brass bracket which can be moved on spindle to any angle to suit
commutator. The brush box slides on the brass table on bracket in a downward
direction. The pressure is applied to back of box by a spiral spring the pressure
being regulated at the top of bracket by the thumb screw attached to spindle which
works through the lug at back of box by a screw thread. It is easy of acess to
change brushes & when worn will not work on to any other segments if the
pressure is excessive and cause sparking.
E. EATON.
Agent for Applicant.
I, GEORGE EDWARD FRANCIS, Warren Lane Chapeltown Sheffield Electrician,
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:-
It consists of a brass bracket which can be moved on spindle to any angle to
suit commutator.
The brush box slides on the brass table on bracket in a downward direction.
The pressure is applied to back of box by a spiral spring the pressure being
regulated at the top of bracket by the thumb screw attached to a spindle which
works through the lug at back of box by a screw thread.
It is easy of access to change brushes and when worn will not work on to any
other segment if the pressure is excessive and cause sparking.
In order that my invention may be fully understood I will now refer to the
annexed drawings in which :-
Figure 1. is a side elevation of my invention.
Figure 2. plan view of same.
a is a bracket piece which is movably carried upon the spindle or bearing b so
that its position may be adjusted thereon being secured in the desired position by
means of the clip or the like c. d is the brush box which slides upon the limb or
guide e on the bracket a and carries the brush f which is secured in the brush box d
by means of the screw spindle g which may be locked in the required position by
the lock nut h. The spindle i slides in the bracket a and has the screwed end i¹

page_text: which engages in the lug; which is formed upon the brush box a or may be attached
thereto by any convenient means. k is a spring which bears upon the bracket a
and collar upon the spindle i and tends to maintain the brush fin contact with the
commutator n. The spindle i may be rotated by means of the thumb screw or the
like m so as to adjust the pressure of the brush f upon the commutator n and it will
be seen that as the brush wears away that its movement will be in a straight line
and will always maintain the same relative position with regard to the commutator.
The angle at which the brush is placed will depend upon the position of the bracket a
upon the spindle or bearings b.
By this arrangement the brush will always operate upon the required segment of
the commutator & thus avoid sparking which takes place when the brush works
upon other than the required segments owing to wear.
The position of the spindle or bearing b may be varied according to circumstances
and the class of machine upon which the invention is employed.
The pressure of the brush f upon the commutator n may be readily regulated by
operating the spindle i so as to more or less compress the spring k.
Having now particularly described and ascertained the nature of my said inven-
tion I declare that what I claim is:
1. The combined construction and arrangement of the various parts substantially
as described and illustrated herein.
2. In brush holders for dynamos of the class herein described, an adjustable
bracket carrying a sliding brush box in which the brush is secured said sliding
brush box being controlled by means of an adjustable spring.
Dated this 13th day of January 1907
E. EATON,
Agent for Applicant.