An Improved Mill for Grinding Grain, Ores, Chemicals, and other Substances.
Year: 1896

page_text: Date of Application, 27th June, 1896
Complete Specification Left, 24th Feb., 1897-Accepted, 27th Mar., 1897
PROVISIONAL SPECIFICATION.
An Improved Mill for Grinding Grain, Ores, Chemicals, and other
Substances.
I, WILLIAM OSCAR COFIELD of Piqua, County of Miami, Ohio, U.S.A.,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
The mill of this invention comprises a casing of an inverted cone shape within
which is located a grinding cone operated by an excentric fitting into a recess in
the upper part of the grinding cone and carried at the bottom end of a vertical
shaft driven by a belt and pulley. The upper part of the vertical driving shaft
carries a fly wheel. The top of the grinding cone has a considerably less diameter
than the top of the casing but at the bottom the grinding cone nearly fits the
bottom of the casing. The grinding cone is supported at the bottom on a step
adjustable vertically by a screw. The material is fed into the top of the casing
between the same and the grinding cone. The casing is inserted in a frame which
is supported on legs and the frame for the vertical driving shaft is located upon
the top of the casing frame.
Dated this 27th day of June 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.
An Improved Mill for Grinding Grain, Ores, Chemicals, and other
Substances.
I, WILLIAM OSCAR COFIELD of Piqua, County of Miami, Ohio, U.S.A.,
Manufacturer, 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 :-
In the accompanying drawing Fig. 1. shews the mill of this invention in
elevation, Fig. 2 in vertical section and Fig. 3 in horizontal section on line 3-3 of
Fig. 2.
A is a frame carried on legs A'. Ba conical casing fitted within the frame A
to form an inverted conical grinding surface on which rolls an inverted cone C
having at its lower end a point C¹ which takes into a step bearing formed at the
end of a screw D screwing through a nut E secured to or supported from the
underside of the frame A. In the top or larger end of the cone C is formed a
central recess C in which engages an excentric F secured on the lower end of a
vertical shaft G mounted to turn in suitable bearings H, H¹, attached to the top of
the frame A.
On the shaft G is secured a pulley I connected by a belt with other machinery
to drive shaft G and through the excentric F to impart motion to the cone C to

page_text: grind the material placed between the cone and the grinding surface of the
casing B. On the shaft G is also secured a fly wheel J so as to insure a steady
motion on the shaft G.
The lower end of the cone C fits comparatively close in the end of the casing.
By adjusting the screw D, the position of this lower end of the cone relative to the
casing can be regulated precisely.
Now it will be seen that the material to be ground and introduced at the upper
end of the casing B is ground by the cone C rolling on the grinding surface of the
casing B. The ground material passes downward in the casing B, to be finally
discharged at the lower end thereof.
A mill constructed as shewn and described can be used for almost any purpose
for which mills are usually employed, that is, for reducing grains or chemicals and
other substances.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A reducing mill comprising a fixed casing having an inverted cone shaped
grinding surface, an inverted cone adapted to roll upon the said surface to grind
the material placed between the cone and the surface, said cone having a recess in
its top or large end and an excentric mounted on a revolving shaft and engaging
the recess of the said cone to impart a rolling motion to the latter, substantially as
described and shewn.
2. A reducing mill comprising a fixed casing having an inverted cone shaped
grinding surface, an inverted cone adapted to roll upon the said surface to grind
the material placed between the cone aud the surface, said cone having a central
recess in its top or large end an excentric mounted on a revolving shaft and
engaging the said recess of the cone to impart a rolling motion to the latter, and a
screw forming a step for the lower pointed end of the said cone, substantially as
described and shewn.
Dated this 24th day of February 1897.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.