IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GRINDING GRAIN, AND IN THE MEANS FOR
Year: 1868

page_text: LETTERS PATENT to Jonathan Dumbleton Pinfold, of Rugby, in the
County of Warwick, Engineer, for the Invention of "IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR GRINDING GRAIN, AND IN THE MEANS FOR
Sealed the 12th March 1869, and dated the 14th September 1868.
PROVISIONAL SPECIFICATION left by the said Jonathan Dumbleton
Pinfold at the Office of the Commissioners of Patents, with his
Petition, on the 14th September 1868.
I, JONATHAN DUMBLETON PINFOLD, of Rugby, in the County of
Warwick, Engincer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GRINDING GRAIN, AND IN
THE MEANS FOR DRIVING OR ACTUATING THE SAME," to be as follows:-
This Invention relates to a peculiar combination and arrangement of
the grinding surfaces used in mills for grinding wheat and other grain,
and also to a mode of driving such mills whereby breakages and sudden
stoppages are avoided should any extra hard substance get introduced
between the grinding surfaces.
According to this Invention it is proposed to combine a number of

page_text: fixed chilled plates suitably grooved or roughened with a runner
composed of natural or artificial stone; the stone which is found to
answer the best is the Derbyshire grey stone, but others may be used if
desired. The runner stone may be either flat or conical, and worked in
combination with a fixed chilled and grooved plate or with a number of
such plates arranged so as to form a hollow cone round the conical stone.
This mill is driven or actuated by any convenient prime mover, but
it is proposed to transmit the motion thro' a frictional driving wheel
which may be mounted either upon the spindle of the stone itself or
upon the main shaft of the prime mover, such, for example, as the first
shaft of a horse gear, or it may be placed in any intermediate position
between the prime mover and the mill. The action of this friction
wheel is that when any sudden resistance occurs the wheel will slip
round within its friction band, which may be of wood or iron, and
tightened up to any desired amount of friction by suitable adjusting
screws.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Jonathan Dumbleton Pinfold in the Great Scal
Patent Office on the 12th March 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME. I, JONATHAN
DUMBLETON PINFOLD, of Rugby, in the County of Warwick, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of September, in tho
year of our Lord One thousand eight hundred and sixty-eight, in the
thirty-second year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Jonathan Dumbleton Pinfold,
Hér special licence that I, the said Jonathan Dumbleton Pinfold, my
executors, administrators, and assigns, or such others as I, the said
Jonathan Dumbleton Pinfold, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should
and lawfully might make, use, and vend within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR GRINDING

page_text: GRAIN, AND IN THE MEANS FOR DRIVING OR ACTUATING THE SAME," upon the
condition (amongst others) that I, the said Jonathan Dumbleton Pinfold,
my executors or administrators, an instrument in writing under my,
or their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed. in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Jonathan Dumbleton Pinfold, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say :-
The Invention relates to a peculiar combination and arrangement of
the grinding surfaces used in mills for grinding wheat and other grain,
and also to a mode of driving such mills whereby breakages and sudden
stoppages are avoided should any extra hard substance get introduced
between the grinding surfaces.
According to this Invention it is proposed to combine a number of
fixed chilled plates suitably grooved or roughened with a runner
composed of natural or artificial stone; the stone which is found to
answer the best is the Derbyshire grey stone, but others may be used if
desired. The runner stone may be either flat or conical, and work in
combination with a fix chilled and grooved plato or with a number of
such plates arranged so as to form a flat surface or a hollow cone round
the conical stone. This mill is driven or actuated by any convenient
prime mover, but it is proposed to transmit the motion through a frictional
driving wheel which may be mounted either upon the spindle of the
stone itself or upon the main shaft of the prime mover, such, for example,
as the first shaft of a horse gear, or it may be placed in any intermediate
position between the prime mover and the mill. The action of this
friction wheel is that when any sudden resistance occurs the wheel
will slip round within its friction band, which may be of wood or iron,
and tightened up to any desired amount of friction by suitable adjusting
screws.
Having now particularly described and ascertained the nature of the
said Invention, I will now proceed to particularly describe and ascertain
in what manner the same is to be performed or put in practice with
reference to the accompanying Drawings.

page_text: Figure 1, a longitudinal section illustrative of a mill constructed in
accordance with my Invention; Figure 2, plan of same; Figure 3, end
view of plates surrounding stone; Figure 4, view of plate shewing
concave fluted surface; Figure 5, end view of same; Figure 6, side view 5
illustrative of friction gearing for driving a mill when applied to a horse
gear; Figure 7, plan of same.
A, friction driving pulley; B, spindle of mill; C, friction collars;
C', friction nut; D, D, stone; D', nut holding stone on spindle;
E, E, E, E, E, E, fluted plates of metal or chilled iron; F, F, bolts 1
holding plates in casing; G, G, G, G, casing; H, screw for adjusting
stone; I, lock nut; J, feed hopper; K, delivery shoot.
Although the Drawings illustrate a mill as used in a horizontal
position, I can use it in a vertical or any other position.
Having now particularly described and ascertained the nature of the 1
said Invention, and in what manner the same is to be performed, I
hereby declare that I claim the improvements in machinery or apparatus
for grinding grain, and in the means for driving and actuating the
same, as herein-before set forth and described, in which improvements
the use of a metal surface acting against a stone surface for the purpose
of grinding is a novel and useful feature, it being understood. that I
do not claim any of the constituent details shewn by the Drawings
and herein described, except as forming part of the arrangements of
machinery above set forth.
In witness whereof, I, the said Jonathan Dumbleton Pinfold, have 2
hereunto set my hand and seal, this Tenth day of March,
in the year of our Lord One thousand eight hundred and sixty-
nine
2
Witness,
H. HARRASON.
J. D. PINFOLD. (L.S.)