Improvements in the Brushes of Dynamos.
Year: 1895

page_text: Date of Application, 24th Oct., 1895
Complete Specification Left, 23rd Nov., 1895-Accepted, 28th Dec., 1895
Improvements in the Brushes of Dynamos.
We, FREDERICK JOHN CHAPLIN and ROBERT CHAPLIN, trading as
W. Chaplain of 233 Park Lane, Aston Birmingham in the County of
Warwick, Wire Drawers, do hereby declare the nature of our said invention
to be as follows:-
Our invention has for its object improvements in the brushes of dynamos which
are more simple in their construction and cheaper to make than those at present in
use which are generally constructed of fine copper wire netting which is expensive
to manufacture.
According to our invention we make our brushes for dynamos principally from
crimped fine copper wire. The crimping may be in one or more directions from
the axis and either regular or irregular. This crimped wire is wound over a
suitable dummy and then pressed together into one section and the convolutions are
severed and the whole encased in a sheet of wire netting or a metallic copper case
when the brush is used as in the ordinary manner.
Dated this 23rd day of October 1895.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicants.
Improvements in the brushes of Dynamos.
We, FREDERICK JOHN CHAPLIN and ROBERT CHAPLIN trading as
W. Chaplin of 233 Park Lane, Aston, Birmingham in the County of
Warwick, Wire Drawers, do hereby declare the nature of our said invention
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :-
Our invention has for its object improvements in the brushes of dynamos which
are more simple in their construction and cheaper to make than those at present in use
which are generally constructed of fine copper wire netting which is expensive to
manufacture.
According to our invention we make our brushes for dynamos principally from
crimped fine copper wire. This crimping may be in one or more directions from
the axis and either regular or irregular. This crimped wire is wound over a
suitable dummy and then pressed together into one section and the convolutions
are severed and the whole encased in a sheet of wire netting or a metalic copper
case when the brush is used as in the ordinary manner.
In order that our invention may be clearly understood and more easily carried
into practical effect we have appended hereunto a sheet of drawings upon which we
have given one example of a brush made in accordance therewith but it will be
clearly understood that the particular mode of covering the wires and the design of
the crimping may be varied without departing from the invention. The brushes
may be made in any required sizes.

page_text: Figure 1 shows a length of fine copper wire with a such like crimping as we find
to answer the purpose.
Figure 2 shows a sufficient number of lengths of wire held together by the binding
wires B at the back end of the brush.
Figure 3 is a plan of the brush complete.
Figure 4 is an enlarged cross section of the completed brush on the line 1. 2.
Brushes at present in use are generally made from a number of strips of
copper or copper gauze or tapes and they are bound tightly together. These
brushes often cut grooves in the commutators and cause sparking which is
objectionable.
Now our brushes are made from such like crimped wire al as that shown by
Figure 1. which may be made up by winding over a mandril until the required
size is obtained when a binding wire or wires B secures them and the opposite
end of the laps are cut through as seen at Figure 2 in the shape of a brush of
crimped wires a¹. The whole may be encased in a covering of gauze as seen at
Figure 3 the edges being lapped over into a flat lap a³ when the brush is ready for
use. We may sew through the lap a³ with stitches a² and we may bind the wires B
through at to secure the whole together or we may finish the back end with a
cap. By these means we obtain a porous or spongy brush with longitudinal wires
crimped which prevents the wires being very close to each other continuously.
The brush may be pressed more or less to bring it to the required shape or section.
We may bind the crimped wires together by lapping wires and dispense with the
gauze covering a*.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The improvements in dynamo brushes consisting of longitudinal wires crimped
and grouped together into the required section either with or without the complete
gauze covering substantially as herein set forth and shown upon the accompany
drawings.
Dated this 22nd day of November 1895.
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent for Applicants.