A Improvements in the Brushes of Dynamos.
Year: 1899

page_text: Date of Application, 24th July, 1899
Complete Specification Left, 24th Apr. 1900.
A
Improvements in the Brushes of Dynamos.
I, FREDERICK JOHN CHAPLIN, of 233, Park Lane, Aston, juxta Birmingham,
in the County of Warwick, Wire Drawer, do hereby declare the nature of my
said invention to be as follows:-
My invention has for its object improvements in the brushes of dynamos
which are more simple in their construction and cheaper to manufacture than
those at present in use.
In carrying my invention into practice I make my brushes for dynamos from
lengths or strips of spirally woven copper wire mesh which may be of any width
and thickness to suit the particular size of brush required. These spirally
woven wire strips are cut up into the required lengths, then compressed to the
desired thickness so as to stiffen and consolidate them and afterwards trimmed
or bevelled at the end when the brush is complete. The strips of copper wire
mesh may be woven in the following manner.
then a layer of single coils intertwined or woven with the compound coils and
First a layer of compound coils
afterwards another layer of compound coils intertwined or
layer of single coils. Or layers of single coils only may be used or the layers
woven with the
may be made of entirely compound coils. These layers are built up or woven
one upon the other to any thickness desired and may be made to any width.
Or in some cases I may use layers of cross spirally woven mesh so as to obtain a
greater stiffness.
It will be seen that by manufacturing brushes for dynamos from a spirally
woven mesh that no sewing or outer case or covering is required and that I
btain a porous or spongy brush.
Dated this 99nd 1...
T
FREDERICK JOHN CHAPLIN.
By George Barker,
Fellow of The Chartered Institute of Patent Agents,
Agent for Applicant,
77, Colmore Row, Birmingham.

page_text: 3.
said invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:
_
My invention has for its object improvements in the brushes of dynamos
which are more simple in their construction and cheaper to manufacture than
those at present in use."
In carrying my invention into practice I make my brushes for dynamos from
lengths or strips of spirally woven copper wire mesh which may be of any width
and thickness to suit the particular size of brush required. These spirally
woven wire strips are cut up into the required lengths then compressed to the
desired thickness so as to stiffen and consolidate them and afterwards trimmed
or bevelled at the end when the brush is complete. The strips of copper wire
mesh may be woven in the following manner. First a layer of compound coils
then a layer of single coils intertwined or woven with the compound coils and
afterwards another layer of compound coils intertwined or woven with the
layer of single coils. Or layers of single coils only may be used or the layers
may be made of entirely compound coils. These layers are built up or woven
one upon the other to any, thickness desired and may be made to any width.
Or in some cases I may use layers of cross spirally woven mesh so as to obtain
greater stiffness.
12.0
a
In order that my invention may be more clearly understood and easily carried
into practical effect I have appended hereunto a double sized sheet of drawings
upon which I have illustrated examples of weaving the coils or helices of wire
together from which my dynamo brushes are manufactured, but it will be evident
that there are numerous other ways in which the coils or helices may be woven
together.
Figure 1 is a plan view shewing a portion of a compound wire mesh on an
enlarged scale from which I form my brushes.
Figure 2 is an end view of Figure 1.
Figure 3 is an enlarged plan view of a modified form of compound wire mesh
from which I make my brushes.
Figure 4 is a view shewing a portion of one of the compound wires partially
coiled which form the mesh as shewn by Figure 3.
Figure 5 is an enlarged view shewing a further modified form of compound
wire mesh from which I make my brushes.
Figure 6 is a view shewing a portion of one of the 'compound wires which
form the mesh as shewn by Figure 5.
Figure 7 is an enlarged view of one of my dynamo brushes.
Figure 8 is an end view of Figure 7.
Figure 9 is an edge view of Figure 7.
In carrying my invention into practice I make my brushes B for dynamos from
.lengths or strips of spirally woven copper wire mesh which may be of any
width and thickness to suit the particular size of brush required.
As an example of the strips of copper wire mesh may be woven in the follow-
ing manner. First a layer of compound coils or helices & b₁ are woven together
to the required width, then a layer of single coils or helices 62 are interwoven
with the compound coils or helices 6 6 and afterwards another layer of com-
pound coils or helices are interwoven with the layer of single coils or
helices as clearly shewn at Figures 1 and 2. The number of layers interwoven
one onto the other depends according to the thickness of the brush required.
These spirally woven wire strips are cut into the particular lengths required
and then compressed so as to obtain a certain stiffness and consolidate them
as shewn at Figure 8 and afterwards trimmed or bevelled at one end when
the brush is complete as shewn at Figures 7 and 9.
In some cases instead of using compound coils or helices as shewn by Figures 1
and 2 I may use layers formed of single coils or helices only or the layers may
be formed entirely of compound coils or helices. Or if it is desired to obtain a

page_text: greater stiffness I may use layers of cross spirally woven mesh either formed
of single coils or helices or compound coils or helices or a combination of single
and compound coils or helices.
number of strands laid together and then wrapped with a single wire or wires go
Or the coils or helices may be formed from a
5 as to form one wire b' as clearly shewn at Figure 4. These wires are coiled or
formed helical and afterwards woven into meshes of the desired width as shewn
at Figure two three or more of these meshes being then interwoven together
to form the desired thickness of brush cut into strips pressed and bevelled in
the same manner as previously described. Or the coils or helices may be
formed from a number of strands twisted together so as to form one wire 65 as
shewn at Figure 6. These wires are coiled or formed helical and afterwards
woven together to form the mesh as shewn at Figure 5 and then built up into
brushes in the same manner as previously described. It will be evident that
cross spirally woven meshes may be formed from the coils or helices 6 and b³.
By manufacturing brushes for dynamos from spirally woven meshes no sewing
or outer case or covering is required and I obtain a strong porous or spongy
brush.
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:-
:
CLAIMS.
First Dynamo brushes constructed from a series of wire coils or helices
interwoven with each other and compressed so as to form a compact fabric of
the required configuration and size substantially as herein set forth and shewn
by examples on the drawings.
Second: Dynamo brushes manufactured from meshes of single or cross
spirally woven wire coils or helices interwoven together either in single or
compound or single and compound coils or helices and then compressed in the
manner substantially as herein set forth and as shewn upon the accompanying
drawings.
Third: Dynamo brushes manufactured from compound coils or helices such
as band band single coils or helices such as 62 interwoven together in
he manner substantially as herein set forth and as shewn by Figures 1 and 2.
Fourth Dynamo brushes manufactured from wire meshes composed of coils
r helices such as 6 or 7 interwoven together in the manner substantially as
erein set forth and as shewn by Figures 3 and 5.
Dated this 20th day of Annil
1000
FREDERICK JOHN CHAPLIN.
By George Barker,
Fellow of The Chartered Institute of Patent Agents,
Agent for Applicant,
77, Colmore Row, Birmingham.