Improvements in Brushes for Dynamos.
Year: 1896

page_text: Date of Application, 22nd Aug., 1898
Complete Specification Left, 31st Oct., 1896-Accepted, 2nd Jan., 1897
Improvements in Brushes for Dynamos.
1, FREDERICK JOHN CHAPLIN of the Firm of Chaplin Brothers of 233 Park
Lane Aston Birmingham in the County of Warwick Wire Drawers, do hereby
declare the nature of my said invention to be as follows:-
My invention has for its object improvements in brushes for dynamos which are
BO constructed as to be much stronger without increasing the weight of material in
them and more pressure may be placed upon them than is possible with brushes as
at present constructed.
I make my new dynamo brush from copper wire gauze one portion of which is
cut in sheets diagonally to the direction of the wires in the usual manner and this
portion may constitute about two thirds of the substance or section of the brush-
more or less. The other one third of the substance of the brush, more or less-
is a portion of a sheet of gauze cut on the straight and incorporated in the folding
or making up of the brush with the other portion cut on the cross in such a manner
that the grain or fibre of one laps the other so as to cause considerable stiffness
and resistance to bending thus enabling much more pressure to be placed upon the
commutator by the brush which is often a considerable advantage.
Dated thin lot dow of 1000
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent.
Improvements in Brushes for Dynamos.
I FREDERICK JOHN CHAPLIN of the Firm of Chaplin Brothers of 233 Park
Lane, Aston, Birmingham, in the County of Warwick, Wire Drawer do hereby
declare the nature of my 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 bas for its object improvements in brushes for dynainos which are
BO constructed as to be much stronger without increasing the weight of material in
them and more pressure may be placed upon them than is possible with brushes as
at present constructed.
I make my new dynamo brush from copper wire gauze one portion of which is cut
in sheets diagonally to the direction of the wires in the usual manner and this portion
may constitute about two thirds of the substance or section of the brush-more or
less: The other one third of the substance of the brush, more or less, is a portion
of a sheet of gauzo cut on the straight and incorporated in the folding or making
up of the brush with the other portion cut on the cross in such a mauber that the
grain or figure of the one laps the other so as to cause considerable stiffness and
resistance to bending thus enabling much more pressure to be placed upon the
commutator by the brush which is often a considerable advantage.

page_text: In order that my invention may be clearly understood and more easily carried
into practical effect I have appended hereunto a sheet of drawings upon which we
have illustrated examples of the same.
Figure 1 shows the outer sheet of copper wire gauze B with the wires 6' and b
running diagonally to the length and breadth of the brush.
Figure 2 shows the inner sheet A with the wires a* and a running with the
length and width of the brush.
Figure 3 shows a brush made up with a oasing composed of a sheet of gauze A
and a sheet of gauze B with a centre of loose, crimped wires as in my previous
Patent No. 20028 of 1895.
Figure 4 shows a brush composed of two sheets of copper wire gauze A and B
wrapped up as those seen with A inside and B outside.
Figure 5 shows the brush in perspective which is shown in section at
Figure 4.
In making my new brushes I take an outer sheet B of copper wire gaze with the
wires or fibres 6 and 6 running diagonally to the length of the brush. The
sheet A has its wires a, a running with the length and squarely across the longth.
In making the brushes A is laid upon B as per dotted lines b, b' when the two
sheets are folded together as seen at Figure 4 but the diagonal casing B is
outside. The folded sheets are then pressed together into the desired shape. A
similarly beneficial effect is produced by crossing the fibres of the sheets as seen at
Figure 3 where the casing is composed of an outer diagonal sheet B and an inner
straight sheet A the centre being made up of crimped wires as upon my previous
Patent No. 20028 A.D. 1895. By this means I obtain considerable stiffness or
rigidity while the bearing point is quite soft and does not cut the commutators of
the dynamo.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declaro that what
I claim is :-
The improvements in brushes for dynamos consisting of an outer sheet B having
the wires running diagonally and an inner sheet A having the wires running square
with the length and breadth of the brush and either with or without & crimped wire
centre a substantially as and for the purpose herein set forth and as shown upon
the drawings.
Dand shin 201sh dose of Ontahan 1806
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent.