Improvements in or connected with the Roughened or Grip Surfaces of Glass.
Year: 1899

page_text: Date of Application, 4th Oct., 1899
Complete Specification Left, 19th May, 1900 - Accepted, 11th Aug., 1900
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Roughened or Grip Surfaces
of Glass.
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I, ARTHUR JAMES DAVIS, of Lynmouth, Birmingham Road, West Bromwich,
in the County of Stafford, Glass Works Manager, do hereby declare the nature
of this invention to be as follows:-
-
This invention relates to improvements in or connected with the production
upon glass of a peculiar roughened or "grip" surface, which is primarily intended
to serve as an adhesive means for attachment of such glass to walls or other
similar purposes.
In carrying out this my invention, I first prepare a chemical compound consisting
of minium and silica which is fused, and mixed one part with about 2 parts of
calcium phosphate, or other suitable and fusible compound. This mixture
is further brought into almost a semi-fluid state, by means of water or oil, or
varnish, or the like.
Reverting now to the manufacture of the glass, and more particularly to that
of sheet glass which is blown into a cylindrical shape, I take, it at this latter
stage and before or after splitting it ready for flattening, but preferably after-
and by means of a brush or other suitable tool apply a coating of the aforesaid
mixture, inside or outside, and then operate upon such coating with a grainer's
comb or such similar tool, by which a perfect "grip" surface more or less
roughened as desired may be produced. The flattening &c. then proceeds in
the usual manner, the sheet finally having a peculiar rough grip surface admir-
ably suited to the purposes required.
Dated this 3rd day of Databer:1800
CHARLES T. POWELL,
Applicant's Agent...
Improvements in or connected with the Roughened or Grip Surfaces
of Glass.
I, ARTHUR JAMES DAVIS, of Lynmouth, Birmingham Road, West Bromwich,
in the County of Stafford, Glass Works Manager, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
iarly described and ascertained in and by the following statement: -
This invention relates to improvements in the production upon cylindrical
plates of glass, of a peculiar roughened or "grip" surface which is intended to
serve as an adhesive means for attachment of such glass when subsequently
flattened, to walls, or other similar purposes.

page_text: In carrying out this my invention, I first prepare any suitable fusible chemical
compound such as for instance, consisting of minium and silica, of about equal
proportions, which is fused and mixed one part with about 2 parts of calcium
phosphate, such a mixture is further brought into almost a semi-fluid state,
by means of water or oil, or varnish, or the like.
I now take the glass, at that point in its manufacture when it has been
blown &c. into the cylindrical shape, and ready for splitting and flattening.
This cylinder is now split and ready for flattening, and while in this state, I
take the fusible compound as before described, and by means of a brush or
other suitable tool apply a coating of it to the glass upon its interior. I then
take a comb, such used for instance by grainer's, or other similar tool, having
teeth, which may vary in coarseness according to desire, and with such a tool I
operate upon the semi-fluid mixture in a simple but rapid manner thereby
producing a comb like serrated roughened surface or grip in the mixture.
It is well known that in order to flatten the glass, the split cylinder is sub-
mitted to heat, and when so heated the flattening tool is wrought upon the
interior surface until the required flatness is attained. In this my invention,
this heating operation however not only prepares the glass for flattening but
also welds the mixture to the glass, and by the time the glass has been sufficiently
heated for the flattening operation, the mixture has become solidified and hardened
so as to readily permit of the flattening tool being wrought thereon. Hence
the one heating serves two operations which hitherto have required separate
heatings when the mixture has been applied after the glass has been flattened.
The further necessary treatment of the glass is carried out in the usual
manner.
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 process of producing rough attachment surfaces upon glass which initially
was a cylinder consisting of splitting said cylinder lengthwise and then treating
the interior of the glass while in such form with an application of coating
mixture and roughening the same, then submitting to heat and subsequently
flattening the same, all as set forth and for the purposes specified.
Dated this 17th day of May 1900.
CHARLES T. POWELL,
Applicant's Agent, 158, Edmund Street, Birmingham.