Improvements in Artificial Blocks or Discs for Grinding or Polishing Purposes.
Year: 1891

page_text: Date of Application, 30th July, 1891
Complete Specification Left, 30th Apr., 1392-Accepted, 4th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in Artificial Blocks or Discs for Grinding or
Polishing Purposes.
We, WILLIAM SYDNEY PEEL, and ARNOLD WILLIAM JAMES SWINDELLS,
both of Newton Street, Manchester, in the County of Lancaster, General Agents,
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a suitable composition for forming
discs of emery corrundum or sand or the like for grinding or polishing purposes
which will be better adapted therefor than those at present in use. The invention
is chiefly applicable for grinding card surfaces but may be applied to others.
We prepare a cement or composition of isinglass glue or other similar animal
preparation with ammoniacum or resin and gum mastic or other vegetable resins or
gums to which the abrasive material is added.
We at present prefer to soften or dissolve the isinglass or other animal matter
with water under a gentle heat and to dissolve the vegetable resin and gum in
rectified spirit and then mix the two together into a pasty mass to which may be
added powdered silica, plaster of paris or other similar substance to harden it.
With this, preferably while still hot, we mix a suitable quantity of emery corrundum
or other abrasive material of any desired degree of fineness and while still soft the
mass is pressed into moulds and allowed to cool. The moulds are preferably heated
to prevent the material cooling and setting too quickly and a very considerable
pressure is applied to consolidate the mass, which pressure is maintained for some
time. If desired the moulds may be heated in order to prolong the process of
pressing before the material sets hard. A greater degree of hardness may be
obtained by heating and cooling the material several times preferably whilst the
pressure is maintained upon it.
Dated this 20th day of July 1891
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Artificial Blocks or Discs for Grinding or
Polishing Purposes.
We,
WILLIAM SYDNEY PEEL, and ARNOLD WILLIAM JAMES SWINDELLS,
both of Newton Street, Manchester, in the County of Lancaster, General Agents,
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 ard by the following
statement :-
'
The
The object of this invention is to provide a composition suitable for the formation
of discs or blocks of emery, corrundum, sand, or the like, for grinding or polishing
purposes, which will be better adapted therefor than those at present in use.
invention is chiefly applicable for the manufacture of discs used for the grinding of
card surfaces, though it may be applied to the manufacture of other grinding or
polishing surfaces.
The invention consists in a cement or composition in the required proportions,
composed of isinglass, glue or other similar animal preparation with ammoniacum
or resin and gum mastic or other vegetable resins or gums with or without plaster
of paris, powdered silica, or other similar substance to harden it, to which, the
required abrasive material is added.

page_text: In carrying out the invention we prefer to soften or dissolve the isinglass or
other animal matter with water under a gentle heat, and dissolve the vegetable
resin and gum in rectified spirit and then mix the two together into a pasty mass,
to which may be added powdered silica, plaster of paris, or other similar substance
to harden it. With this, and preferably while still hot, we thoroughly incorporate
the desired quantity of emery, corrundum, or other abrasive material, and while
in a plastic condition the mass is pressed into moulds and allowed to cool.
For the manufacture of discs for the grinding of card surfaces we find the
following proportions to produce the best results
Isinglass
Water
Gum ammoniacum
Gum mastic
Rectified spirits
:-
1536
96 parts by weight
"
"
"
1
"
"
3
"
وو
"
18
وو
و,
To one ounce of this cement we add one ounce of plaster of paris or similar
hard setting substance and sixteen ounces of the emery, corrundum, or other
abrasive material. These proportions or quantities however may be varied
according to the results desired to be obtained.
The moulds are preferably heated to prevent the material cooling and setting
too quickly, and a very considerable pressure is applied, say two tons to the square
inch, to consolidate the mass, which pressure is maintained for some time, say
about fifteen minutes. If desired the moulds may be reheated several times, in
order to prolong the process of pressing before the material sets hard. A greater
degree of hardness may be obtained by heating and cooling the material several
times preferably whilst the pressure is maintained upon it, or it may be removed
from the mould, reheated, replaced in the mould, and the pressure again applied.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. In the manufacture of blocks or discs of emery, corrundum, sand, or the like
for grinding and polishing purposes, the employment of isinglass, glue, or other
similar animal preparation with ammoniacum or other resin and gum mastic or
other vegetable resins or gums with or without some hard setting substance sub-
stantially as described.
2. The process of manufacturing blocks or discs for grinding and polishing
purposes substantially as described.
Dated this 29th day of April 1892.
W. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.