An Improved Method of Mounting Grindstones.
Year: 1894

page_text: Date of Application, 26th Nov., 1894
Complete Specification Left, 24th Aug., 1895--Accepted, 9th Nov., 1895
PROVISIONAL SPECIFICATION.
An Improved Method of Mounting Grindstones.
ALFRED CLARE Mechanical Model Maker 115 Quinn Square Waterloo Road
London S.E. do hereby declare the nature of this invention to be as follows:-
The object of this improved method of mounting grindstones is to prevent
portions of the stone flying when the stone is revolving at a high rate of speed,
and also to enable a grindstone of large size to be constructed from smaller sections
of stone.
To attain this object I shape the grindstone on each side flat and parallel for a
certain distance from the centre. From near the centre to the outer edge the
Plates of metal flat for a certain
grindstone is slightly convex upon each side.
distance from the centre to correspond with the flat part of the grindstone and
then concave upon their inner side to correspond with the convex sides of the
grindstone are placed upon each side of the grindstone covering it upon each side
from the centre to near the outer edge. The plates of metal are held in position
against each side of the grindstone by a circular boss of metal of the same size as
the flat part of the grindstone and the flat part of the metal plates.
The boss of metal has a hole in the centre through which the spindle of the
grindstone can pass.
Nuts screwed upon the spindle hold the circular boss of metal tightly against
the flat centre of the metal plates causing the concave portion of the metal plates
to grip tightly over the convex sides of the grindstone.
Only so much of the outer edge of the grindstone as is necessary for actual use
is allowed to project beyond the outer edge of the metal plates.
The metal plates are constructed in half circular sections so that small portions
of the metal plates may be removed from the grindstone from time to time as the
grindstone wears away.
Deted this 26th dovr of November 1894
ALFRED CLARE.
An Improved Method of Mounting Grindstones.
ALFRED CLARE 115 Quion Square Waterloo Road London S.E. Mechanical
Model Maker 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:-
The invention consists of an improved method of mounting grindstones, emery
or other grinding wheels so as to prevent such grinding wheels flying or bursting
when they are revolving at a high rate of speed and also to enable grindstones
with a broad grinding edge to be constructed of two or more narrower stones
held firmly together side by side.
For this purpose the sides of the stone or grinding wheel are flat and parallel
for a certain distance from the centre. From near the centre to its outer edge the
stone or grinding wheel is slightly convexed upon each side.
Plates of metal flat for a certain distance from the centre and then having their
D. 1

page_text: Fig. I is an elevated section of a grindstone, spindle, plates, bosses, and nuts.
Fig. II is a flat view of one of the plates constructed in half circular sections.
Fig. III is an enlarged view of a portion of the half circular sections of a plate
to show more clearly the method of fixing the same together.
The same referance letters are used in different views of the same parts.
A A A A Fig. I is a grindstone, in this case constructed of two pieces of stone
the inner sides of which are perfectly flat and parallel. The outer sides of each
etone are flat and parallel for a certain distance from the centre and then slightly
convexed to its outer edge. The perfectly flat and parallel sides are placed
together and the spindle B is passed through a hole in the centre of the stones.
The two plates C. C. C. C (here shown constructed in half circular sections) and
with a hole in the centre of each plate are placed on the spindle, the inuer
sides of the plates being brought against the outer sides of the stones to which
they are shaped to fit. The flat circular bosses D. D are placed upon the spindle
gainst the flat parallel centres of the plates. The nuts E. E are screwed upon
the spindle causing the bosses D D to press against the plates CC CC which will
then press against the outer sides of the stones A A A A holding the two peices
of stone firmly together and also preventing any portion of the stones flying or
bursting when running at a high rate of speed.
Should a wheel with a very broad grinding edge be required three or more
pieces of stone may be used. In this case the extra stone or stones will be flat and
parallel upon both sides and they will be placed between the stones A A A A.
Should the stone or grinding wheel be in only cue piece both sides of the stone
or grinding wheel will be flat and parallel for a certain distance from the centre
and then slightly convexed to its outer edge.
In some cases it may be advisable that the plates should be slightly more
concaved upon their inner sides than the stone is convexed upon its outer sides so
as to cause the plates to grip the stone tightly as near as possible to its outer edge.
Figs. 2 and 3 show the method of fixing a plate together when it is constructed in
half circular sections FF is a flange turned up at the extremity of each of the half
circular sections of the plate see Fig. 3. When two corresponding half circular
sections of the plate are brought together a bolt H passes through a hole in the
flanges and being screwed up holds the two sections of the plate firmly together.
It will be seen Fig. 2 that the flanges F F are placed at right angles in each
succeeding circle of the plate so that the flange I Fig 3 at two points in each circle
is held in position by the slot N cut in the flanges F F. The lug K falls into

page_text: the slot L cut in the flange I at the junction of each half circular section and
prevents any movement of the various sections of the plate when the wheel is in
motion.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same may be performed I declare that what I
claim is
1st. A stone or grinding wheel flat and parallel for a certain distance from its
center upon each side and then having each side slightly convexed to its outer
edge, in conjunction with two metal plates shaped to fit upon the sides of the stone
or grinding wheel the same as herein shown and described.
2nd. The method of holding two or more pieces of stone side by side to obtain
a broad grinding edge the same as herein shown and described.
3rd. The construction of the metal plates in half circular sections the same as
herein shown and described.
Dated this 24th day of Angust. 1895
ALFRED CLARE.