IMPROVEMENTS IN GRINDING MILLS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said William Wingfield-Bonnyn
at the Office of the Commissioners of Patents on the 19th August 1882.
WILLIAM WINGFIELD-BONNYN of Jermyn Street in the County of Middlesex
"IMPROVEMENTS IN GRINDING MILLS
"
This Invention which although specially adapted for the production of wheaten
flour, can be used to reduce any other grains or cereals may be thus briefly
described.
A French burr-stone or emery iron roller is carried upon an horizontal axis in a
suitable framework, and rotated at a high rate of speed in proximity to a back of
like substance.
The inner face of this back is a curve corresponding to a half, a third or a
fourth part of the circumference of the roller. The periphery of the stone or
roller and the inner face of the back constitute the grinding surfaces.
The position of the roller is exceptional it is so placed relatively to the back that
the distance between them diminishes gradually from the point at which the grain
to be ground is introduced, to that at which the meal or flour passes out, the
relative position of these parts being such that however much the distance between
the roller and the back or counterpart may be varied the disparity in the size of
the throat and mouth of the grinding space shall be always maintained.
Both the roller and the counterpart or back have smooth surfaces so that the
berry of the material passing through whether wheat or other cereal is crushed
and a very large proportion of meal and fine flour ready for the bolter are
given out.
The relative positions of the roller and counterpart or back may be adjusted by
means of wedges, keys or screws at the bearings of the journals in which the shaft
runs, or the counterpart itself may be provided with means (such for instance a
screwed spindle working in the frame and connected with it) for moving it upon
[Paine G1

page_text: a slide bearing nearer to or farther from the roller according to the fineness of
grinding required.
If desired a succession of machines such as above described may be employed,
each grinding finer than its precedessor, and an elevator may conveniently be used
in combination with these to return the tailings and coarser portion of the material
after it has been bolted or sifted to be again ground.
By using this invention the grinding and bolting operations alone will produce a
fine white flour delivered in a cold condition, and therefore not liable to ferment,
and safe for distant export.
Besides this with the same amount of motive power this Invention will produce
in a given time more than twice the quantity of meal or flour than can be
delivered by any ordinary horizontal burr stone roller or any other style of mills
known.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Wingfield-Bonnyn in the Great Seal Patent Office on
the 17th February 1883.
WILLIAM WINGFIELD-BONNYN of Jermyn Street in the County of Middlesex
"IMPROVEMENTS IN GRINDING MILLS
"
This Invention which although specially adapted for the production of wheaten
flour, can be used to reduce any other grains or cereals, may be thus briefly
described.
A French burr stone, or emery iron roller is carried upon an horizontal axis in &
suitable framework, and rotated at a high rate of speed in proximity to a back of
like substance.
The inner face of this back is a curve corresponding to a half, a third or a
fourth part of the circumference of the roller.. The periphery of the stone or roller
and the inner face of the back constitute the grinding surfaces.
The position of the roller is exceptional, it is so placed relatively to the back that
the distance between them diminishes gradually from the point at which the grain
to be ground is introduced, to that at which the meal or flour passes out, the
relative position of these parts being such that however much the distance between
the roller and the back or counterpart may be varied, the disparity in the size of
the throat and mouth of the grinding space shall be always maintained.
Both the roller and the counterpart or back have smooth surfaces so that the
berry of the material passing through whether wheat or other cereal, is crushed
and a very large proportion of meal and fine flour ready for the bolter are
given out.
For full comprehension of the Invention reference is made to the annexed
drawings which show a mill constructed according to my invention and in which
Figure 1 is a front elevation (with the cover removed) Figure 2 is a side elevation
Figure 3 is a plan (with the cover and feed hopper removed) and Figure 4 is a
transverse vertical section.
Similar letters of reference indicate like parts.
A is a roller about 12 inches in diameter made of either of the materials before
named or of other like and suitable material.
This roller is mounted upon an iron shaft a preferably square carried in suitable
adjustable bearings as shown from the frame B.
This roller is rotated at a very high speed by means of the pulley C mounted
on the shaft a-a speed of about 250 revolutions per minute will be found
suitable
D is the hopper in which the material to be ground is placed, its delivery there-
from into the space between the roller and the back E, is regulated by the small
feed roller d.
E is the back or counterpart, it is made of like material with the roller A and it
has a curved grinding surface corresponding to a segment of the roller and so
arranged as to be further from the roller at the receiving than at the delivery
point.
The relative positions of the roller and counterpart or back may be adjusted by
means of wedges, keys, or screws at the bearings of the journals in which the shaft
runs, (the drawing represents screws at the bearings) or the counterpart itself may
be provided with means (such for instance as a screwed spindle working in the
frame and connected with it) for moving it upon a slide bearing nearer to, or farther
from the roller according to the fineness of grinding required.

page_text: If desired a succession of machines such as above described may be employed,
each grinding finer than its predecessor, and an elevator may conveniently be used
in combination with these, to return the tailings and coarser portion of the material
after it has been bolted or sifted, to be again ground.
By using, this Invention the grinding and bolting operations alone will produce a
fine white flour delivered in a comparatively cold condition, and therefore not liable
to ferment and safe for distant export.
Besides this with the same amount of motive power this Invention will produce
in a given time more than twice the quantity of meal or flour than can be
delivered by any ordinary horizontal burr-stone roller or any other style of mills
known.
What I claim is as follows:-
The
The combination in a grinding machine of the following elements.
revolving roller and a fixed or moveable counterpart, having its inner or grinding
surface identical with a segment of such roller such parts being so arranged that
the distance between them is greater at the point of entry of the grain than at the
point of exit and remains so as hercin set forth, in every adjustment of the mill.
In witness whereof the said William Wingfield-Bonnyn have hereunto set
my hand and seal this Thirtieth day of November in the year of Our Lord
One thousand eight hundred and eighty two,
117M 117INCHIELD PONNVNT
WM WINGFIELD BONNYN (L.S.)