IMPROVEMENTS IN ROLLS FOR GRINDING MILLS
Year: 1882

page_text: LETTERS PATENT to William Phillips Thompson of the Agency for Foreign
Patent Solicitors 6 Lord Street, Liverpool in the County of Lancaster and
323 High Holborn in the county of Middlesex Civil Engineer for an invention
of IMPROVEMENTS IN ROLLS FOR GRINDING MILLS A communication from
abroad by Richard Birkholz and Edward P Allis both of Milwaukee,
Wisconsin United States of America
PROVISIONAL SPECIFICATION left by the said William Phillips Thompson
at the Office of the Commissioners of Patents on the 19th April 1882.
WILLIAM PHILLIPS THOMPSON of the Agency for Foreign Patent Solicitors
6 Lord Street Liverpool, in the county of Lancaster, and 323 High Holborn, in
the county of Middlesex, Civil Engineer "IMPROVEMENTS IN ROLLS FOR
GRINDING MILLS," a communication from abroad by Richard Birkholz and
Edward P. Allis, both of Milwaukee Wisconsin United States of America
This invention relates to that class of rolls employed for grinding middlings
reducing grain etcetera which consists of a hollow cylindrical body of porcelain or
equivalent material mounted around a shaft and carried by end-plates or collars
thereon. The object of the invention is to provide a simple and inexpensive
method of attaching the roll body to the shaft and of retaining the same accurately
in position without danger of its being fractured.
The invention consists in providing the ends of the roll with beveled or inclined
faces and combining therewith correspondingly recessed end-plates or collars and
tie-rods, or equivalent devices for forcing the plates against the ends of the body
with such pressure that the body will be rotated by the friction and without the
necessity of employing interlocking lugs and notches as usual.
The invention also consists in minor details hereinafter described.
On a supporting and driving shaft two end-plates or collars are keyed or otherwise
secured, to prevent them from turning thereon, and between these end-plates the
porcelain body of a hollow cylindrical form is held by tie-rods extending through
the interior of the body, and through the end-plates, for the purpose of drawing

page_text: them firmly together. The porcelain body has its end-faces squared or flattened
around the central portion, but bevelled or inclined around the outer edge, these
end surfaces being left continuous and unbroken without notches or cavities
therein.
The end-plates or collars have their inside faces beveled or recessed to admit the
ends of the body; the flat and bevelled faces of the two co-operating and retaining
the body securely and accurately in position.
In order to prevent the porcelain, which is exceedingly brittle from being
fractured by the pressure of the heads, and to increase the friction between the
parts annular packing sheets or washers inade of paper or similar material are
introduced between the end-plates or heads and the body These washers are
formed by incising the inner edge of a continuous ring so that it may assume the
required angular form to fit between the parts. The tie bolts or rods are provided at
one end with heads, and at the opposite ends with nuts as shown whereby they are
adapted to draw the end-plates with great firmness against the ends of the body.
In place of the nuts other tightening devices may be employed, and in place of the
rods, collars threaded upon the shaft and screwing against the outer sides of the
end plates may be used to force them inward The interior space within the body
is left vacant and the end-plates perforated to permit the air to circulate freely
through the interior, thereby keeping the body cool.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Phillips Thompson in the Great Seal Patent Office on
the 19th October 1882.
WILLIAM PHILLIPS THOMPSON, of the Agency for Foreign Patent Solicitors,
6, Lord Street, Liverpool, in the County of Lancaster, and 323 High Holborn, in
the County of Middlesex, Civil Engineer "IMPROVEMENTS IN ROLLS FOR
A communication from abroad by Richard Birkholz and
Edward, P. Allis, both of Milwaukee, Wisconsin, United States of America.
GRINDING MILLS.".
-
This invention relates to that class of rolls employed for grinding middlings
reducing grain et-cetera which consist of a hollow cylindrical body of porcelain or
equivalent material mounted around a shaft and carried by end plates or collars
thereon. The object of the invention is to provide a simple and inexpensive
method of attaching the roll body to the shaft and of retaining the same accurately
in position without danger of its being fractured.
The invention consists in providing the ends of the roll with beveled or inclined
faces, and combining therewith correspondingly recessed end-plates or collars and
tie-rods, or equivalent devices for forcing the plates against the ends of the body
with such pressure that the body will be rotated by the friction and without the
necessity of employing interlocking lugs and notches as usual.
The invention also consists in minor details hereinafter described.
Fig. 1, is a side elevation of the improved roll shown partly in section.
Fig. 2, is an end elevation partly in section.
Fig. 3, is a face view of one of the washers or packing rings.
A represents the supporting and driving shaft: B, B. the two end plates or
collars, keyed or otherwise secured upon the shaft to prevent them from turning
thereon: C the porcelain body of a hollow cylindrical form; D. D. the tie-rods
extending through the interior of the body and through the end plates for the
purpose of drawing them firmly together. The porcelain body has its end faces
squared or flattened around the central portion as shown at A but beveled or
inclined around the outer edge as shown at b, these end surfaces being left continuous
and unbroken, without notches or cavities therein.
The end plates or collars have their inside faces beveled or recessed, as shown to
admit the ends of the body; the flat and beveled faces of the two co-operating and
retaining the body securely and accurately in position. In order to prevent the
porcelain, which is exceedingly brittle, from being fractured by the pressure of the
heads, and to increase the friction between the parts, annular packing sheets or
washers E. made of paper or similar material are introduced between the end plates
or heads and the body as shown. These washers are formed as shown in Fig. 3
by incising the inner edge of a continuous ring so that it may assume the required
angular form to fit between the parts. The tie-bolts or rods are provided at one
end with heads and at the opposite ends with nuts as shown whereby they are
adapted to draw the end plates with great firmness against the ends of the body.
In place of the nuts other tightening devices may be employed and in place of the
rods, collars threaded upon the shaft and screwing against the outer sides of the end
plates may be used to force them inward. The interior space within the body is
left vacant, and the end plates perforated to permit the air to circulate freely
through the interior, thereby keeping the body cool.
Having now described the invention as communicated to me and the best mode
known to me of carrying it into effect I wish it to be understood that what I

page_text: ve to be new and desire to protect under the hereinbeforo in part recited
ers Patent is :-
st The porcelain or equivalent body, having the unbroken tapered ends in
combination with the smooth recessed end plates and means substantially
as described for forcing the plates against the body.
nd In a porcelain grinding roll, the combination of end plates having smooth
conical recesses therein and a porcelain body having smooth tapered ends
seated in said plates and held by friction.
rd The combination of the shaft, the conically recessed heads arranged to slide
but not turn on the shaft, the body having the tapered end and the tie rods
as,shown.
th The combination of the body having the flat and the beveled end faces; in
combination with the end plates having the corresponding flat and beveled
faces, the intermediate washers and means substantially as described for
forcing the end plates inward to hold the body by friction.
In witness whereof I the said William Phillips Thompson bave hereunto set
my hand and seal this eighteenth day of October in the year of our Lord
one thousand eight hundred and eighty two.