IMPROVEMENTS IN MACHINERY FOR MAKING BRICKS. AND OTHER PLASTIC FORMS
Year: 1873

page_text: LETTERS PATENT to Thomas Grimbleby, Brickmaker, and Francis.
Grimbleby, Blacksmith, both of Hull, in the County of York, for
the Invention of "IMPROVEMENTS IN MACHINERY FOR MAKING BRICKS.
AND OTHER PLASTIC FORMS."
PROVISIONAL SPECIFICATION left by the said Thomas Grimbleby
and Francis Grimbleby at the Office of the Commissioners of
Patents, with their Petition, on the 26th April 1873.
We, THOMAS GRIMBLEBY, Brickmaker, and FRANCIS GRIMBLEBY,
Blacksmith, both of Hull, in the County of York, do hereby declare.
the nature of the said Invention for "IMPROVEMENTS IN MACHINERY FOR,
MAKING BRICKS AND OTHER PLASTIC FORMS," to be as follows:-
This Invention consists in forming a chamber at or near each die at
the bottom or lower end of a pug mill, sufficient space or spaces being
left for the plastic material to pass down. The pug mill shaft carries
a revolving cam, and communicates a to-and-fro motion to a slide. The
revolving cam forces the plastic material into one of the chambers where

page_text: it is confined by the plate forming the top of the chamber, and by the
slide in front, the material consequently must necessarily pass through
the die. The slide is simultaneously forced out through an aperture in
the cylinder, and the slide on the opposite side drawn in, which in its
turn is forced out, the two ends of the slide being joined by two rods,
or other suitable contrivance for such purpose.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Grimbleby and Francis Grimbleby in the
Great Seal Patent Office on the 25th October 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
GRIMBLEBY, Brickmaker, and FRANCIS GRIMBLEBY, Blacksmith, both
of Hull, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-sixth day of April, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto us, the said Thomas Grimbleby and
Francis Grimbleby, Her special licence that we, the said Thomas
Grimbleby and Francis Grimbleby, our executors, administrators, and
assigns, or such others as we, the said Thomas Grimbleby and Francis
Grimbleby, our 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 "IMPROVEMENTS IN MACHINERY FOR MAKING BRICKS AND OTHER PLASTIC
FORMS," upon the condition (amongst others) that we, the said Thomas
Grimbleby and Francis Grimbleby, our executors or administrators,
by an instrument in writing under our, or their, or one of their
hands and seals, should particularly describe and ascertain the nature a
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.

page_text: NOW KNOW YE, that we, the said Thomas Grimbleby and Francis
Grimbleby, do hereby declare the nature of our said Invention, and in
what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, reference being had
5 to the accompanying Drawings, and to the letters of reference marked
thereon, that is to say :-
-
This Invention consists in forming a chamber at or near each die at
the bottom or lower end of a pug mill, sufficient space or spaces being
left for the plastic material to pass down. The pug mill shaft carries
a revolving cam, and communicates a to-and-fro motion to a slide. The
revolving cam forces the plastic material into one of the chambers where
it is confined by the plate forming the top of the chamber, and by the
slide in front, the material consequently must necessarily pass through
the die. The slide is simultaneously forced out through an aperture in
3 the cylinder, and the slide on the opposite side drawn in, which in its
turn is forced out, the two ends of the slide being joined by two rods, or
other suitable contrivance for such purpose.
And in order that this our Invention may be more readily understood,
we will now proceed to describe the same with reference to the accom-
panying Drawings, of which Fig. 1 is a vertical section on line A, B,
Fig. 2; Fig. 2 is a horizontal section on line C, D, Fig. 1; and Fig. 3
is a horizontal section on line E, F, Fig. 1.
P is the pug mill, to the bottom of which our machine is
attached.
a is the pug mill shaft, and 6 a cam on the same, which when the
shaft is revolved forces the plastic material into one of the chambers c, c;
d, d, are plates fastened to the inner sides of the pug mill and forming
the top of a chamber on each side; these chambers c, c, are formed,
firstly, by the plates d, d; secondly, by the cam b as it comes against
one side or the other; and, thirdly, by one of the slides e, e, which are
united by the bars f, f, passing on each side of the pug mill shaft a, so
that when one slide is forced out the other is drawn in; the bottom of
the machine forms the bottom of the chambers; 9, 9, are two dies or
outlets for the plastic material, one at each side, and so as to receive it
as it is pressed alternately into and through one chamber or the other.
The plastic material being confined in the chambers c, c, as described, is
obliged to pass out the only way open, namely, one of the dies or

page_text: .
outlets
9, 9; these are at the mouth made of the required size for the
brick or other moulded form, and cut off as required. Instead of the
two plates d, d, fixed to the sides of the pug mill, one plate might be
fixed on the top of the cam, the action otherwise remaining similar.
The moulded forms are then carried away by hand, by endless band, or
by other suitable and well-known appliances, as desired.
And having now described the nature of this Invention, and the mode
in which it may be carried into effect, we declare that we claim,-
Firstly. Forming a chamber alternately on one side and the other by
means of plates d, d, slides e, e, and a revolving cam b, all substantially
as herein set forth for the purpose of confining the plastic material in
the said chambers alternately, and forcing it out at one die or outlet, or
the other.
Secondly. The combination of slides e, e, a revolving cam b, and a
plate d on the same, all substantially as herein set forth for the purpose
of confining the plastic material in the thus alternately formed chambers
and forcing it out at one die or outlet, or the other.
Thirdly. The application of a machine with such alternately formed
chambers to pug mills, substantially as set forth.
ין
1
In witness whereof, we, the said Thomas Grimbleby and Francis 2
Grimbleby, have hereunto set our hands and seals, this Twenty-
second day of October, in the year of our Lord One thousand
cight hundred and seventy-three.