IMPROVEMENTS IN CORN MILLS, APPLICABLE ALSO TO MILLS FOR GRINDING .OTHER MATERIALS
Year: 1881

page_text: LETTERS PATENT to Albert Edward Fisher Chattaway, of Wixford, in the
County of Warwick, Salesman, for an Invention of "IMPROVEMENTS IN CORN
MILLS, APPLICABLE ALSO TO MILLS FOR GRINDING .OTHER MATERIALS."
PROVISIONAL SPECIFICATION left by the said Albert Edward Fisher
Chattaway at the Office of the Commissioners of Patents on the 13th May
1881.
ALBERT EDWARD FISHER CHATTAWAY, of Wixford, in the County of Warwick,
Salesman. "IMPROVEMENTS IN CORN MILLS, APPLICABLE ALSO TO MILLS FOR
GRINDING OTHER MATERIALS."
This Invention consists of certain improvements in mills for grinding grain of
any kind, berries, cement, or materials analogous thereto, by an arrangement of the
stones in suitable framework, so that the running stone may be driven at any
velocity. With this view I make the running stone the lower one, and I fix it in
a frame which is capable of adjustment in a vertical line; the stone is fixed upon
a centre spindle, which spindle passes upwards and freely through the top stone.
The lower end of the spindle is turned to work smoothly in a toe brass fixed in
the bottom bar of the frame; this toe brass is capable of adjustment by set screws;
a similar toe brass in the head bar of the frame receives the upper end of the
spindle. The top stone is hung upon a universal joint to admit of the necessary
amount of oscillation. The relative position of the stones vertically is adjusted
by making the side standards of the frame with a telescopic action, so that the
botton or running stone may be brought up to or withdrawn from the top stone
by the action of a screw and hand wheel.
By making the lower stone the runner, I obviate a difficulty which arises in
driving a top stone at high velocity, namely, a tendency to rise from high
centrifugal action, and I further avoid a large amount of friction.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Albert Edward Fisher Chattaway in the Great Seal Patent Office
on the 11th November 1881.
ALBERT EDWARD FISHER CHATTAWAY, of Wixford, in the County of Warwick,
Salesman. "IMPROVEMENTS IN CORN MILLS, APPLICABLE ALSO TO MILLS FOR
GRINDING OTHER MATERIALS."
The
This Invention refers to mills for grinding corn and other grain, coffee, and other
berries, drugs, colours, cements, and in general all substances usually ground
between stones or discs of steel, and for the purposes of this Specification I shall
proceed to describe the mill as for grinding corn by means of a pair of stones.
Drawing represents it in parallel perspective. The mill consists of four standards A,
a base plate B, and it is covered with a removable top plate C, which top plate can
be taken off when it is required to take out the stones for dressing. Two of the
four standards A are grooved on the inside faces vertically to receive a sliding
frame D, upon the bottom bar of which is hung in a toe brass E, placed centrally
on the bar, a vertical spindle F, upon which the lower stone is fixed; this spindle
passes through the eye of the top stone, which is free upon the spindle F. The
top bar of the sliding frame D is similarly fitted with a top brass J, into which the
spindle runs; both these brasses are of the ordinary construction, and are fitted
with adjusting screws. Below the lower stone G, and upon the same spindle F, is
the driving pulley K; the upper stone H is hung upon a universal joint on a bar L,
which is fitted in slots in the other two of the standards A, in which it is adjusted
and secured by screw pins M. The lower stone G is the running stone, and both
stones are enclosed in a case N (shewn broken away), and covered top and bottom,
and the corn is fed through the oye of the top stone on to the lower stone, the
flour being delivered into the enclosing case, and driven out through a shoot P in
the bottom of the case. On the top of the top bar of the sliding frame D is fixed
centrally an adjusting screw R, which passes through the top cover C, and is
fitted with a hand wheel S. This adjusting screw R is for the purpose of raising
and lowering the sliding frame D which carries the lower stone G, so that the
distance between the stones may be adjusted by raising the lower one towards or
removing it away from the upper or fixed stone H. Under the hand wheel S is
placed a strong spring T, so that in the event of any hard substance other than the
article being ground getting between the stones or rollers, the spring T may give
way, and allow such substance to fall out. If preferred, the raising or lowering and
adjustment of the lower stone G may be effected in a similar manner to that
described from the underside of the stone instead of from the top of the mill. By
this arrangement for fixing and driving the lower stone I am enabled to work the
mill at a much higher speed than can be done by driving the upper stone, as the
stones once set cannot fly upwards by centrifugal force, a result which by the usual
arrangement, and whether the upper or lower stone be the running one, limits the
speed at which the mill can be worked; or by another plan, which is merely the
reverse of that already described, I make the top stone the adjustable one by fixing
the lower stone, and mounting the upper one in an adjustable frame, by which it
is prevented from approaching or receding from the lower one, the lower stone still
being the running one. The mill may also be worked vertically instead of
horizontally if preferred, the arrangement being equally useful in keeping the stones
at their proper relative distance.
Having thus described the nature of my said Invention, and the manner in
which the same is to be performed, I do not confine myself to the precise details
herein illustrated, as these may admit of variation, but I claim,―
The arrangement and combination of the several parts or appliances by which
I am enabled to drive the lower stone at a higher speed without disturbing the

page_text: position of either of the stones vertically, namely, mounting the lower stone in a
frame capable of adjustment, and fixing in its bearings or similarly mounting the
upper stone, together with the several parts by which such adjustment and fixing
is effected, all substantially as herein more fully set forth and specified.
In witness whereof, I, the said Albert Edward Fisher Chattaway, have
hereunto set my hand and seal, this Tenth day of November, in the year
of our Lord One thousand eight hundred and eighty one.
ALBERT EDWARD FISHER CHATTAWAY, (L.S.)