Improvements in Wheels and other Tools for Grinding, Sharpening, and Polishing.
Year: 1896

page_text: Date of Application, 6th June, 1896
Complete Specification Left, 6th Mar., 1897-Accepted, 24th Apr., 1897
PROVISIONAL, SPECIFICATION.
Improvements in Wheels and other Tools for Grinding, Sharpening,
and Polishing.
We, FREDERICK EDWARD HARNETT, of 26 Dupree Road, Charlton, Mechanic,
and GILBERT JAMES ROBERT MILLINGTON of Woolwich Road, Belvedere,
Engineer, both in the County of Kent, do hereby declare the nature of this
invention to be as follows:-
For the purposes of our invention we take emery, corundum, or other similar
material, and we mix the same with silicate of soda and silica in proportions which
may be varied according to the purposes for which the finished wheel or tool is
intended to be employed. For example for 128 pounds weight of material for
wheels intended to be used for dry grinding, we may employ the following
proportions:
Improvements in Wheels and other Tools for Grinding, Sharpening,
and Polishing.
We, FREDERICK EDWARD HARNETT, of 26 Dupree Road, Charlton, Mechanic
and. GILBERT JAMES ROBERT MILLINGTON of Woolwich Road, Belvedere,
Engineer, both in the County of Kent, 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 :-
For the purpose of our invention we take emery, corundum, or other similar
material, and we mix the same with silicate of soda and silica in proportions which
may be varied according to the purposes for which the finished wheel or tool is
intended to be employed. For example for preparing 128 lbs. of material for
D

page_text: wheels or other grinding, sharpening or polishing tools we have obtained good
results with the following proportions:-
These ingredients are first thoroughly well mixed together and then kneaded or
pressed into moulds of the shape of the wheel or other tool it is desired to produce.
The articles thus shaped are then turned out of the moulds on to a suitable plate,
and are subjected to a heat of from 250° to 350° Fahrenheit for a period of about
seven hours in a reverberatory or other suitable furnace, or stove, and they are
then ready for use.
The kind of silica that we have found best suited for the purpose is that known
as Dinas silica flour used for making the well known Dinas silica cement, largely
used for lining furnaces and other similar purposes. The silicate of soda employed
should be of about specific gravity 1700, water being 1000.
Having now particularly described and ascertained the nature of this inven
tion, and in what manuer the same is to be performed, we desire to have it
understood that we are aware that it is not novel to make wheels and other tools
for grinding, sharpening and polishing with emery, silica, silicate of soda, and
certain cementitious materials and that we make no claim to such manufacture, but
we declare that what we do claim is :-
The manufacture of wheels and other tools for grinding, sharpening and polishing,
by mixing together emery, corundum or other similar material, silica, and silicate
of soda, moulding the mixture to the desired shape, and then subjecting to heat,
substantially as described.
Dated this 6th day of March 1907
F. E. HARNETT,
G. J. R. MILLINGTON,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.
F. E. HARNETT,
G. J. R. MILLINGTON,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.