Improvements in Brushes for Dynamos and Electric Motors.
Year: 1897

page_text: Date of Application, 28th Apr., 1897
Complete Specification Left, 25th Jan., 1898-Accepted, 23rd Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in Brushes for Dynamos and Electric Motors.
I, ARTHUR FREDERICK GUY, of No. 1, Oak Road, Crumpsall, near Manchester,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
-
My invention is an improved form of brush for dynamos and electric motors.
The brush is made of a number of very thin sheets of metal, such as copper or
any alloy of copper, these sheets are laid one on the top of another, the number
varying according to the thickness of the brush. The sheets so built up may be
wrapped up in a covering of gauze cloth of suitable metal or alloy, this wrapping
may be entirely outside of the sheets, or it may be partly inserted between the
sheets of the brush, the loose end being stitched with wire thread where requisite,.
& the whole brush held together by means of rivets or fasteners, preferably fixed
through the centre of the brush. In place of a gauze cloth wrapping or covering,
the sheets may be envelopped by a band or band of metal gauze cloth, or by any
suitable metal or metal alloy, the band or bands being wound round the sheets,..
either at right angles to, or at any other angle with, the length of the brush, &.
so as to form either a complete or partial covering, either one continuous band.
being used, or several, & to be held in place by rivets or stitching, or any suitable
attachment.
The end of the brush, if desirable, may be soldered for a short distance, to form
a more reliable contact with the brushholder.
One account of the thinness of the metal sheets, the brush so made up, is
extremely flexible, which quality enables it to adapt itself most readily to the
requirements of the commutator or collector. This flexibility combined with
the thinness of each sheet of metal reduces the friction between the brush & the
commutator to a minimum. Where more flexibility is required, the sheets may be
rivetted or attached together without any wrapping or bands, being placed round
them.
The metal or alloy used in the brush above described may be coated with some
other suitable metal or with some suitable anti frictional substance, or compound,
applied by any usual method.
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improvements in brushes г рупашована глосите носог
I, ARTHUR FREDERICK GUY, late of 1, Oak Road, Crumpsall, near Manchester,
22, The Mount, York, Electrical Engineer, do hereby declare the nature of
[Price 8d.1

page_text: this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
On
My invention is an improved form of brush for dynamos and electric motors.
The brush is made of a number of very thin sheets of metal, such as copper, brass,
or any alloy of copper, or other suitable metal; these sheets are laid one on the
top of another, the number varying according to the thickness of the brush.
account of the thinness of the metal sheets, the brush so made up is extremely
flexible, which quality enables it to adapt itself most readily to the requirements
of the commutator or collector. This flexibility combined with the thinness of
each metal sheet reduces the friction between the brush and the commutator to a
minimum. The sheets so built up may be wrapped up in a covering of gauze
cloth of suitable metal or alloy, this wrapping may be entirely outside of the sheets,
or it may be partly inserted between the sheets of the brush, the loose end of the
wrapper when outside of the brush can be fastened by means of wire stitching,
& the whole held together by means of rivets or fasteners, preferably fixed through
the centre of the brush. Figures 1 & 2 show sections of the brush, where a indi-
cates the thin sheets & b the wrapping. In place of a gauze cloth wrapping, the
sheets may be envelopped by a band or bands of metal or metal gauze cloth, or by a
wire of metal of suitable thickness. The band or wire being wound round the
sheets, to form either a complete or partial covering, & being held in place by
rivets or other suitable attachment.
This winding may be either at right angles, or at any other angle with the length
of the brush."
The object of these methods of wrapping, is to give stiffness to the brush:
Where the full flexibility of the thin sheets is required; the sheets may be rivetted
or attached together, without any wrapping or bands being placed round them.
The metal or alloy used in the brush above described may be partially or wholly
coated with some suitable antifrictional metal or substance, such as carbon &c.,
by any of the usual methods or the sheets may be separated partially, or wholly,
each from the other, or in definite sections of a number, by any approved non-con-
ducting substance such as mica &c.
Having now particularly described & ascertained the nature of my said inven-
tion, & in what manner the same is to be performed, I declare that what
I claim is:
1. A brush for dynamo and electric motors, made of a number of thin sheets of
metal, & wrapped in the manners described.
2. A brush for dynamo and electric motors made of a number of thin sheets
of metal, coated or separated with antifrictional or non-conducting substances,
and wrapped substantially as described.
Dated this 24th day of January 1898.