IMPROVE- MENTS IN SCRATCH AND OTHER BRUSHES
Year: 1885

page_text: I, CHARLES COXSON of Warstone Lane, Birmingham in the county of Warwick,
Manufacturer do hereby declare the nature of this my said invention for IMPROVE-
MENTS IN SCRATCH AND OTHER BRUSHES, to be as follows:-
This invention relates to the construction of brushes particularly those known
among jewellers as scratch brushes, and consists in the employment of a thickness
of india-rubber near the root of the bristles, that is, where the bristles are connected
to the body or block, whereby the elasticity of the said bristles is increased, and
their liability to break very much reduced.
In describing this my invention for instance as applied to metallic circular scratch
brushes, I should say that upon the central hub or block, I mount an india-rubber
ring or collar of a suitable thickness. The bristles pass through this ring and are
Becured in the central hub or block in the ordinary manner.
In the ordinary method of construction, the bristles are apt to break off especially
when much strain is put upon them, owing to the unyielding nature of their con-
nection to the hub, but with this my improvement, the india-rubber affords &
yielding to the pressure, and at the same time gives an increased elasticity to the
bristles.
It is also found that in brushes of present make, that when having been used for
a time running in one direction, should the direction be reversed, the breaking
of the bristles is very considerable, but with this india-rubber thickness, this is
obviated.

page_text: I, CHARLES COXSON of Warstone Lane, Birmingham in the county of Warwick
Manufacturer, do hereby declare the nature of my invention for IMPROVEMENTS
IN SCRATCH AND OTHER BRUSHES, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:—
This invention relates to the construction, of brushes, particularly those known
among jewellers as scratch brushes, and consists in the employment of a thickness
of india-rubber near the root of the bristles, that is, where the bristles are con-
nected to the body or block, whereby the elasticity of the said bristles is increased,
and their liability to break very much reduced.
In order to describe this, my invention, more clearly, I, have appended hereunto an
illustrative sheet of drawings, upon which are figures and letters of reference.
Fig. 1 is a front elevation of a brush constructed according to this my invention.
Fig. 2, is sectional elevation of Fig. 1,,upon line A-B..
It will be seen that the general construction of the brush is similar to those of
ordinary manufacture with the following, exception; that around the wood centre,
hub, or block, a, I mount an india-rubber ring b. The metallic wires or bristles c,
pass through perforations in the india-rubber, into the centre, block, or hub a, and
are secured in the ordinary method, or manner.
The thickness of this india-rubber ring may be varied to suit pleasure.
In the ordinary method of construction the wire bristles are apt to break off,
when in use, especially when much strain is put upon them, owing to the unyielding
nature of the wood' centre, at that point where they (the bristles) enter the said
centre, but with this my improvement the india-rubber affords a yielding property
to the bristles, thus increasing their elasticity.
It is also found that in brushes of present make, when they have been in use
for a time running in one direction, that should'the direction of rotation be reversed,
the bristles suffer considerable breakage, but with the india-rubber ring this danger
is avoided.
This my invention is applicable to scratch brushes, and other brushes of a similar
construction, but especially adapted for that process of scratch brushing known as
"frosting."
Having now particularly described and ascertained the nature of this, my said
invention, and in what manner the same is to be performed I declare that what
I claim is
The application of an india-rubber layer; or thickness, upon the exterior of the
centres or blocks of scratch. brushes, and other brushes of a similar construction,
at, the roots of the bristles, similarly as hereindescribed and shewn upon the
drawing.
Dated thin orth do of Tan 1996