IMPROVEMENTS IN AND RELATING TO THE ROLLERS OF GRAIN ROLLER MILLS
Year: 1880

page_text: LETTERS PATENT to Robert Hunter Hay, of Glasgow, in the County of
Lanark, Merchant Miller, for an Invention of "IMPROVEMENTS IN AND
RELATING TO THE ROLLERS OF GRAIN ROLLER MILLS."
PROVISIONAL SPECIFICATION left by the said Robert Hunter Hay at the
Office of the Commissioners of Patents on the 25th May 1880.
ROBERT HUNTER HAY, of Glasgow, in the County of Lanark, Merchant
Miller. "IMPROVEMENTS IN AND RELATING TO THE ROLLERS OF GRAIN ROLLER
MILLS."
Roller mills used for reducing grain, middlings, and semolina into meal and flour
have, as heretofore constructed, effected the reduction usually by a crushing action,
and sometimes by a crushing and tearing action. The effect has not been uniformly
beneficial.
The object of my Invention is to provide roller mills, the rollers of which
are adapted to act by cutting, by combined cutting and crushing, or by crushing
only.
For that purpose I make the rollers of an entirely novel composition of matter.
I intimately mix emery, corundum, ground quartz, buhr, or other hard granulated
or powdered substance, with magnesite or other binding cement which sets hard and
tough without the application of heat, and form the rollers of the mixture, either by
moulding or casting around the spindle or otherwise, or by forming a coating on
rolls at present in use, or similar, or resembling those now in use.
When a cutting action is desired, the surface of one roll is made to run considerably
faster than that of the adjacent one. When a combined cutting and crushing action
is desired, the cutting not to be excessive, the one roller runs slightly faster than
the other, and when only a crushing action is wished, the surfaces of the rolls have
uniform speed.
Rolls made with No. 1½ emery, sixty five parts by weight, cemented by sixteen
parts magnesite, and nineteen chloride of magnesium, of 52° Twaddle's hydrometer,
(or 30 to 33° Beaume's), all well mixed and allowed to stand about a week, have
been found to answer well in the manufacture of wheaten flour. Corundum of the
fineness known as No. 46, mixed in the same proportion with the magnesite and
chloride of magnesium, is effective.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Hunter Hay in the Great Seal Patent Office on the 25th
November 1880.
ROBERT HUNTER HAY, of Glasgow, in the County of Lanark, Merchant
Miller. "IMPROVEMENTS IN AND RELATING TO THE ROLLERS OF GRAIN ROLLER
MILLS."
Roller mills used for reducing grain, middlings, and [semolina into meal and
flour have, as heretofore constructed, effected the reduction usually by a crushing
action, and sometimes by a crushing and tearing action. The effect has not been
uniformly beneficial.
The object of my Invention is to provide roller mills, the rollers of which
are adapted to act by cutting, by combined cutting and crushing, or by crushing
only.
For that purpose I make the rollers of an entirely novel composition of matter.
I intimately mix emery, corundum, ground quartz, buhr, or other hard
granulated or powdered substance with magnesite or other binding cement
which sets hard and tough without the application of heat, and form the rollers
of the mixture, either by moulding or casting around the spindle or otherwise,
or by forming a coating on rolls at present in use, or similar, or resembling those now
in use.
When a cutting action is desired, the surface of one roll is made to run considerably
frster than that of the adjacent one. When a combined cutting and crushing action
is desired, the cutting not to be excessive, the one roller runs slightly faster than the
other, and when only a crushing action is wished, the surfaces of the rolls have
uniform speed.
Rolls made with No. 1 emery, sixty five parts by weight, cemented by sixteen
parts magnesite, and nineteen chloride of magnesium of 52° Twaddle's hydrometer,
all well mixed and allowed to stand about a week (or 30 or 33° Beaume), have
been found to answer well in the manufacture of wheaten flour. Corundum of the
fineness known as No. 46, mixed in the same proportion with the magnesite and
chloride of magnesium, is effective.
It will be evident that the proportions of the agents employed may be greatly
varied, and that equivalents for some of them may be employed without departing
from my Invention.
But what I claim under the hereinbefore in part recited Letters Patent is,―
First. Rollers for reducing grain composed constructed, to act, and made to
operate, substantially as herein set forth, and
Second. Giving to rollers composed as specified for the purposes herein set forth
the motions necessary for their effective operation as described.
In witness whereof, I, the said Robert Hunter Hay, have hereunto set my
hand and seal, this Twenty fourth day of November, in the year of our
Lord One thousand eight hundred and eighty.