IMPROVEMENTS IN MILLS FOR GRINDING
Year: 1868

page_text: LETTERS PATENT to John Garrett Tongue, of the Firm of Tongue
& Birkbeck, Patent Agents & Engineers, of 34, Southampton
Buildings, Chancery Lane, in the County of Middlesex, for the
Invention of "IMPROVEMENTS IN MILLS FOR GRINDING."-A communi-
cation from abroad by Charles Umfrid, residing in Paris, in the
Empire of France.
Sealed the 12th February 1869, and dated the 18th August 1868.
PROVISIONAL SPECIFICATION left by the said John Garrett Tongue
at the Office of the Commissioners of Patents, with his Petition, on
the 18th August 1868.
I, JOHN GARRETT TONGUE, of the Firm of Tongue & Birkbeck,
Patent Agents & Engineers, of 34, Southampton Buildings, Chancery
Lane, in the County of Middlesex, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN MILLS FOR GRINDING," to be as
follows:-
The Invention relates to the arrangement and construction of mills for
grinding grain or other substance in which three millstones are employed,
one running and two standing in such manner that the two surfaces of
the said running millstone act as working parts, and which are in contact
with the surfaces of the standing millstones, through the eyes of which
the grain or other substance to be ground is conducted. The stationary.
millstones are mounted in supports which rest in guides formed in the

page_text: base or foundation plate of the apparatus, and so that they can be caused
to approach towards the running millstone in such manner that the
position of the working surfaces may be readily adjusted. The stationary
millstones are securely fixed to supports which, are themselves mounted
upon a foundation frame so that their position may be regulated by
causing them to advance or recede by means of screws which also
maintain them in the respective positions they should occupy. Between
the two stationary millstones is placed the running millstone which is
fixed upon an axis; this axis passes freely through the sockets of the
supports before referred to, which serve as bearings for it. Movement is
transmitted to the axis by a pulley keyed on one of its extremities and a
strap placed in communication with some suitable motive power. At
the extremities of the foundation frame two supports are raised which
carry the regulating screws bearing against the extremities of the axis
in order to maintain the running millstone in the desired position. The
supports of the stationary millstones are provided with channels which
communicate with the eyes of the stationary millstones and with funnels
which support a cross bar in such manner that it may be moved with
the supports backwards or forwards without ceasing to be connected
therewith. In the centre of the cross bar is fixed a distributor which is
provided with two spouts or mouthpieces conducting to the funnels.
The connection of the distributor with the cross bar is effected by a
turning bolt, and a jerking or vibratory movement is imparted to the
distributor by an eccentric which is mounted upon the driving axis,
which eccentric aots upon a lever the upper forked part of which acts
upon an arm attached to the distributor. Above the distributor a hopper
is mounted which is secured to the cross bar by arms; this hopper is
pierced with two openings which may be opened or closed by suitable
doors. The running millstone is surrounded by a cover of sheet iron.
SPECIFICATION in pursuance of the conditions of the Letters Patent, 3
filed by the said John Garrett Tongue in the Great Scal Patent
Office on the 17th February 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
GARRETT TONGUE, of the Firm of Tongue and Birkbeck, Patent Agents
and Engineers, of 34, Southampton Buildings, Chancery Lane, in the a
County of Middlesex, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighteenth day of August, in the 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 successors,
give and grant unto me, the said John Garrett Tongue, Her special
licence that I, the said John Garrett Tongue, my executors, admi-
nistrators, and assigns, or such others as I, the said John Garrett
Tongue, 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,
exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "IM.
PROVEMENTS IN MILLS FOR GRINDING," a communication to me from abroad
by Charles Umfrid, at present residing in Paris, in the Empire
of France, upon the condition (amongst others) that I, the said
Jolin Garrett Tongue, my executors or administrators, by an instru-
ment in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said Inven-
tion, 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 John Garrett Tongue, 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, that is to say :-
This Invention relates to improvements in the arrangement and
construction of mills for grinding grain or other substances in which
three millstones are employed, one running and two standing, in such
manner that the two surfaces of the said running millstone act as
working parts, and which are in contact with the surfaces of the standing
millstones, through the eyes of which the grain or other substance to be
ground is conducted. The stationary millstones are mounted in supports¨
which rest in guides formed in the base or foundation plate of the
apparatus, and so that they can be caused to approach towards the
running millstone in such manner that the positions of the working
surfaces may be readily adjusted.
And in order that the nature of the Invention may be most fully

page_text: Figure 1 shows a longitudinal exterior elevation; Figure 2 is an
end view; Figure 3 shows a vertical longitudinal section of a mill
for grinding grain or other substance, arranged and constructed in
accordance with these improvements.
a and a represent the stationary millstones securely fixed to the
supports 8, 8', which are mounted upon the foundation frame F, so that
their position may be regulated by causing them to advance or recede
by means of the screws and r¹; these screws also maintain them in
their respective positions. Between the two stationary millstones is
placed the running millstone b, which is fixed upon an axis c; this axis
passes freely through the sockets of the supports 8, 81, before referred to,
which serve as bearings for it; Figure 3 shows this arrangement more
clearly. Movement is transmitted to the axis c by means of a pulley
keyed on, one of its extremities, and a strap placed in communication
with some suitable motive power. At the extremities of the foundation
frame F two supports e, e¹ are raised, which carry the regulating screws
ff, bearing against the extremities of the axis c, in order to maintain
the running millstone in the desired position. The supports 8, 81, of
the stationary millstones and provided with channels t, t, which com-
municate at their lower extremities with the eyes of the stationary
millstones, and at their upper parts with the funnels g, g', which support
the cross bar h in such manner that it may be moved with the sup-
ports 8, s, backwards or forwards without ceasing to be connected
therewith. In the centre of the gross bar ha distributor k is fixed,
which is provided with two spouts or mouth pieces conducting to the
funnels g, g. The connection of the distributor with the cross bar is
effected by a turning bolt i, and a jerking or vibratory movement is
imparted to the distributor k by the eccentric 1, which is mounted
upon the driving axis c, and which eccentric acts upon the lever m, the
upper forked part of which acts upon an arm attached to the distributor,
as is indicated in Figure 3 of the Drawing. Above the distributor ka
hopper n is mounted, which is secured to the cross bar h by the arms o,
as shown in Figure 2; this hopper is formed with two openings p, p',
which may be opened or closed by the doors q, q', as shown, or otherwise.

page_text: The running millstone is enclosed by a suitable cover of sheet iron or
other material.
This improved combination of millstones is arranged to act in the
following manner:-After the grain or other substance to be ground has
been introduced into the funnel n, and the axis c has been set in motion,
the doors q, q', are opened, and the grain then descends by the
funnels g, g', and channels t, t, into the eyes of the two stationary
millstones a, a, where it then comes in contact with the working surfaces
of the running millstone. The ground grain or other substance which
passes between the said working surfaces passes out through the
passage u, which may be provided with a diaphragm or partition board,
from which the meal is conducted to the separator.
By the improved arrangement of parts previously described a more
advantageous result is obtained than heretofore in mills of the ordinary
construction, and as all the parts of the mill are mounted upon one and
the same plate or foundation frame, the construction is simplified, the
trouble of mounting and removal being also materially lessened.
Having thus described the nature of the said Invention and the
manner of performing or carrying the same into practice, I would have
it understood that the construction and arrangement of the parts may
be varied without departing from the true character of the Invention,
which consists in the improved arrangement and combination of parts
wherein two stationary millstones a, a', are combined with one running
millstone brevolving between them, together with the means of
supporting, adjusting, regulating, and actuating the parts, substantially
as herein described.
In witness whereof, I, the said John Garrett Tongue, have
hereunto set my hand and seal, this Seventeenth day of
February, in the year of our Lord One thousand eight hundred
and sixty-nine.