ROVEMENTS IN MACHINERY FOR GRINDING DYEWOODS, MYRABOLMS, AND SIMILAR SUBSTANCES
Year: 1880

page_text: LETTERS PATENT
to Thomas John Pickles, Sam Smithson, and Charles
Henry Pickles, of Ravensthorpe, in the County of York, for an Invention
IMPROVEMENTS IN MACHINERY FOR GRINDING DYEWOODS, MYRABOLMS,
AND SIMILAR SUBSTANCES."
of
"
PROVISIONAL SPECIFICATION left by the said Thomas John Pickles,
Sam Smithson, & Charles Henry Pickles at the Office of the Commissioners
of Patents on the 4th November 1880.
THOMAS JOHN PICKLES, SAM SMITHSON, and CHARLES HENRY PICKLES, of
Ravensthorpe, in the County of York. "IMPROVEMENTS IN MACHINERY FOR
GRINDING DYEWOODS, MYRABOLMS, AND SIMILAR SUBSTANCES."
This Invention relates to grinding machinery in which revolving arms or beaters
are employed to pulverize the material by crushing it against the teeth or ribs of
a circular grate.
case.
Our improvements consist in forming the case of the machine larger than usual,
so as to leave a space of several inches between the grate and the interior of the
Around this space the sides of the case are cut away, and the openings
covered with wire gauze protected by a cover or box. The pulverized material
when sufficiently fine is forced through the gauze or seive by the current of air
generated by the revolving beaters, and is received within the boxes at the sides,
from which it is removed in the usual manner.
Instead of forming the ends of the beaters straight we make them angular, and
the grates are shaped to correspond therewith, which we find to give better
results.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas John Pickles, Sam Smithson, & Charles Henry Pickles
in the Great Seal Patent Office on the 4th May 1881.
THOMAS JOHN PICKLES, SAM SMITHSON, and CHARLES HENRY PICKLES, of
Ravensthorpe, in the County of York. "IMPROVEMENTS IN MACHINERY, FOR
GRINDING DYEWOODS, MYRABOLMS, AND SIMILAR SUBSTANCES.'
"
This Invention relates to grinding machinery in which revolving arms or beaters
are employed to pulverize the grain or other material by crushing or grinding it
against a series of teeth or ribs so placed as to form a circular grate.
I Duins Ar

page_text: Our improvements relate to the sifting apparatus, and also to the form of the
grate and beaters.
In order that our Invention may be fully understood we herein give reference
to the accompanying Sheet of Drawings.
Fig 1 is a longitudinal section of the machine; Fig. 2 a sectional plan view, and
Fig. 3 a vertical cross section; Fig. 4 illustrates shape of tooth or rib forming
circular grate.
A is the outer casing of the machine, through the centre of which passes a shaft B
which carries the arms or beaters C. The ribs D are fixed separately within the
casing, so that damaged ribs may be replaced by new ones without disturbing the
remainder; E are sieves of wire gauze, and F are other sieves of the same material
but finer mesh. It will thus be seen that the entire casing of the machine is
divided into five compartments 1, 2, 3, 4, 5, each of which is provided with an
outlet G at the bottom.
The material to be ground is first fed to the central compartment through the
hoppers H, and is ground between the beaters and ribs. The pressure of air
generated by the revolving beaters forces the ground material to the outer part of
the casing, and the finest particles pass through the sieves E and F to the com-
partments numbered 4 and 5. Those particles which are too large to pass through
the sieves F remain in the compartments 2 and 3, and the coarser material remains
in the first compartments. Three degrees of fineness are thus produced, and the
larger sizes may be ground over again according to requirement.
By making the grates and beaters angular we obtain more grinding surface than
if straight.
The sieves may be kept clean by a revolving or reciprocating brush.
Having thus described the nature and object of this our said Invention, together
with the manner in which the same may be performed or carried into practical
effect, we would have it understood that we do not confine ourselves to the precise
details herein shewn and described, as the same may be varied without essentially
departing from our Invention, but what we believe to be new, and therefore claim
as our Invention, is,—
Firstly. The use in combination with grinding machines of this description of
one or more sieves placed parallel to the plane of rotation of the beaters, so that
the material is forced through the sieves by the current of air generated by the
beaters.
Secondly. Constructing the casing or framework of such machines with spaces or
compartments 1, 2, 3, 4, 5, beyond the circumference of the grating D.
Thirdly. Constructing the ribs D and the ends of the beaters C angular, as herein
shewn and described.
In witness whereof, we, the said Thomas John Pickles, Sam Smithson, and
Charles Henry Pickles, have hereunto set our hands and seals, this Second
day of May, in the year of our Lord One thousand eight hundred and