Year: 1887

page_text: Date of Application, 24th June, 1887
Complete Left, 22nd Mar., 1888
Complete Accepted, 27th Apr., 1888
EDWARD JONES of 13 Blenheim Square, Leeds in the County of York Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:-
The objects of this invention are to avoid the wearing away of the commutators
through the friction of the brushes; to provide for the application of a lubricant
between the brushes and the commutator; and to ensure a steady pressure of the
brushes on the commutator, and always in the same line, in a more efficient manner
than heretofore; and the invention consists in forming the brushes and brush bolders
in such a manner that the above objects will be attained.
In carrying out my invention, 1 form the brush of a bundle of fine copper wires,
or other suitable material, of any suitable length. This bundle is first dipped in a
suitable lubricant, and is then inserted in a metal tube, say of thin brass, and is
soldered to one thereof. The tube is then submitted to pressure in a mould, or other-
wise, by which means it is flattened out, and a number of serrations are formed on
its underside to receive the edge of a clip forming part of the holder, and by which
the brush is secured in the holder.
The brush holder consists of a two-armed bracket, which is clamped onto the rod,
and having in each arm a slot or guide hole to receive the brush. Secured to the
bracket is a spring or its equivalent, to which the clip before mentioned is attached,
and by means of which the brush is kept in contact with the commutator with
a regular pressure, the tension being adjusted by means of the clip according to
requirements.
The bearing end of the brush is bevelled off to accommodate itself to .the com-
mutator, and as the brush end becomes warm through the friction, the lubricant is
gradually drawn down to that point.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Dynamo-electric Generators
and Motors.
I EDWARD JONES of 13 Blenheim Square, Leeds in the County of York, 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 :-
The objects of this invention are to avoid the wearing away of the commutators
through the friction of the brushes; to provide for the application of a lubricant
between the brushes and the commutator; and to ensure a steady pressure of the
brushes on the commutator, and always in the same line, in a more efficient manner
than heretofore; and the invention consists in forming the brushes and brush holders
in such a manner that the above objects will be attained.
In carrying out my invention, I form the brush of a bundle of fine copper wires,
or other suitable material, of any suitable length. This bundle is first dipped in a
suitable lubricant, and is then inserted in a metal tube, say of thin brass, and is
soldered to one thereof. The tube is then submitted to pressure in a mould or other-
wise, by which means it is flattened out and a number, of serrations are formed on
its underside to receive the edge of a clip forming part of the holder, and by which
the brush is secured in the holder.
The brush holder consists of two armed bracket, which is clamped onto the rod,
and having in each arm a slot or guide hole to receive the brush.-Secured to the
bracket is a spring or its equivalent, to which the clip before mentioned is attached,
and by means of which the brush is kept in contact with the commutator with a
regular pressure, the tension being adjusted by means of the clip according to
requirements.
The bearing end of the brush is bevelled off to accommodate itself to the commutator
when the brush is not used in a position radial to the commutator, and as the brush
end becomes warm through the friction, the lubricant is gradually drawn to that
point.
In the accompanying drawing,-
Figs. 1 represent, in side view and cross section, the first stage in the manufacture
of the brushes ;
Figs. 2 being similar views of the completed brush.
Fig. 3 is a plan view, Fig. 4 an end view, and Fig. 5 a side view of a commutator
with the brushes in position.
A is the bundle of fine wires, which after being dipped in a suitable lubricant, are,
forced into the tube B, to the end of which the bundle of wires is soldered. The
brush thus made is placed in a suitable press, and is flattened out to the form shown
in Figs. 2, the free ends of the wire being bevelled off, or made of a suitable form to
bear properly on the surface of the commutator.

page_text: As the wires wear away, a portion of the containing tube is cut off, leaving a small
portion of the wires exposed, as shown.
C is the commutator, D is the brush holder, consisting of a two-armed bracket
piece, which is strung on and fixed to the rod E. The arms of the holder are slotted
longitudinally to receive the brush, which is held by a gripping piece F attached to
the holder D by the spring F¹. This spring also serves to press the brush against
the commutator with an elastic, but even pressure, which may be regulated, as
described, by shifting the grip in one direction or the other. G is a wire by
which the current may be taken, under some circumstances, from the brush to the
rod E.
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
1. The construction of brushes for dynamo-electric generators or motors as herein
shown and described.
2. The means for holding the brushes of dynamo electric machines as herein
shown and described, and for the purpose set forth.