IMPROVEMENTS IN VERTICAL CONICAL Den mann Aviva M GRINDING
Year: 1874

page_text: LETTERS PATENT to Thomas Heydon, of No. 1, Wharf Street,
Canning Town, in the County of Middlesex, and Daniel Evans, of
No. 6, Newcastle Street, Cubitt Town, Poplar, in the said County of
Middlesex, for the Invention of "IMPROVEMENTS IN VERTICAL CONICAL
Den mann Aviva M "
Scaled the 4th September 1874, and dated the 7th March 1874.
PROVISIONAL SPECIFICATION left by the said Thomas Heydon and
Daniel Evans at the Office of the Commissioners of Patents, with
their Petition, on the 7th March 1874.
We, THOMAS HEYDON, of No. 1, Wharf Street, Canning Town, in the
County of Middlesex, and DANIEL EVANS, of No. 6, Newcastle Street,
Cubitt Town, Poplar, in the said County of Middlesex, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN VERTICAL CONICAL
BURR STONE GRINDING MILLS," to be as follows:-
This Invention has for its object improvements in vertical grinding
mills for cereals, minerals, drugs, chemicals, barytes, paints, and other

page_text: mixtures, For this purpose we place the internal cone of stone or other
composition in lieu thereof vertically, the smallest side uppermost, so
that when the materials of whatsoever kind are being ground they will
clear themselves by gravity from the surfaces of the internal and
external cones.
This in the case of thick oil, paint, and other articles of
a like nature will be done to greater advantage as heretofore.
When grinding hard intractable substances with horizontal surfaced
stones, or conical stones with théir axes horizontal, there has always
been a difficulty in getting such materials to gather between the stones,
as the tendency was repellent. Our plan obviates this difficulty, as the
materials fall by their own gravity. between the stones, and are there
ground to the required fineness.
Under existing systems of mills there are no provisions made for
increasing the diameter of the internal and external grinding cones to an
indefinite size owing to the small size of the French burr stone, but one
of our improvements consists in using cast-iron frames for both internal
and external cones, and building up burr stones upon and in the frames
in segments, using bolts, dovetails, cement, or any other hind of fastening
to any size required.
SPECIFICATION in pursuance of the conditions of the Letters Patent, a
filed by the said Thomas Heydon and Daniel Evans in the Great Seal
Patent Office on the 7th September 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
HEYDON, of No. 1, Wharf Street, Canning Town, in the County of
Middlesex, and DANIEL EVANS, of No. 6, Newcastle Street, Cubitt Town,
Poplar, in the said County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventh day of March, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Thomas Heydon and Daniel Evans,
Her special license that we; the said Thomas Heydon and Daniel Evans,
our executors, administrators, and assigns, or such others as wc, the
said Thomas Heydon and Daniel Evans, our executors, administrators, and

page_text: 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, exercise, and vend, within the United>
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN VERTICAL CONICAL BURR STONe
GRINDING MILLS," upon the condition (amongst others) that we, the said
Thomas Heydon and Daniel Evans, our executors or administrators;'
by an instrument in writing under our, or their, or one of our or their
hands and seals, should particularly describe and ascertain the. naturo
of the said Invention, and in what manner the same was to be per-
formed, 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 we, the said Thomas Heydon and Daniel Evans,
do hereby declare the nature of the 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 and the Drawings
therein referred to (that is to say) :-
:-
This Invention has. for its object improvements in vertical grinding
mills for cereals, minerals, drugs, chemicals, barytes, paints, and other
mixtures. For this purpose we place the internal cone of stone (of:
of composition in lieu of stone) vertically, the smallest side upper-:
most, so that when the materials of whatsoever kind are being ground:
they will clear themselves by gravity from the surfaces of the internal
and external cones. This, in the case of thick oil, paint, and other:
articles of a like nature, will be done to greater advantage than here- :
toforc.
When grinding hard intractable substances with horizontal surfaced
stones, or conical stones with their axes horizontal, great difficulty has been
experienced in getting such materials to gather between the stones, as
the tendency was repellent. Our plan obviates this difficulty, as the "
materials fall by their own gravity between the stones, and are there
ground to the required fineness.
Under existing systems of mills, so far as we know, the diameters of
the internal and external grinding cones have been limited, owing to the -
small size of the French burr stone. Now one of our improvements
consists in using cast-iron frames for both internal and external cones,

page_text: Such being the nature of our said Invention, we now proceed to 5
describe the manner of carrying the same into practical effect, as repre-
sented in the accompanying Sheets of Drawings, wherein,―

page_text: !
The upper or female stone frame or carrier o is formed with a hopper p,
and is attached at o' to the main framing of the machine. The female
stone * is built up in segments, similarly to the lower or male stone, an
inner rim o² being substituted for the conical wedge. q is an annular
receptacle for the ground material. The rotating frame carries a flapper
for drawing the material in the receptacle q to a spout running there-
from, and whereby it may be conducted into any suitable receiver.
+
The foot step 6 is carried by one end of a lever of the first order,
having its fulcrum at 6' and a counterbalance weight 6s at the other end.
This weight keeps the lower stone up to its work, but the stone is
retained at the proper distance below the upper stone by the check bolt ?*
which supports the weighted end of the lever, leaving it however free to
rise and the lower stone to descend when any obstruction or unduly hard
substance is inadvertently allowed to enter between the operating surfaces
5 of the stones.

page_text: and described with reference respectively to Figs. 1 to 6 inclusive, and
Figs. 7 and 8 of the accompanying Drawings.
In witness whereof, we, the said Thomas Heydon and Daniel Evans,
have hereunto set our hands and seals, this Seventh day of
September, in the year of our Lord One thousand eight hundred t
and-seventy-four.