IMPROVEMENTS IN APPARATUS FOR CRUSHING AND SIFTING
Year: 1858

page_text: LETTERS PATENT to Robert Jobson, of Wordsley, in the County of
Stafford, Ironfounder, for the Invention of "IMPROVEMENTS IN APPARATUS
FOR CRUSHING AND SIFTING."
Sealed the 11th February 1859, and dated the 12th August 1858.
PROVISIONAL SPECIFICATION left by the said Robert Jobson at the
Office of the Commissioners of Patents, with his Petition, on the 12th
August 1858.
I, ROBERT JOBSON, of Wordsley, in the County of Stafford, Ironfounder,
do hereby declare the nature of the Invention for "IMPROVEMENTS IN APPA-
BATUS FOR CRUSHING AND SIFTING," to be as follows:-
This Invention has for its object improvements in apparatus for crushing
and sifting. For these purposes a rotating sieve is used, and it is constructed
with circular ends and longitudinal bars, suitable for receiving, and having
fixed between them perforated plates or frames of wire gauze or reticulate
plates suitable for sifting; and it is preferred that these sieves and the longi-
tudinal bars which receive them should be formed in such manner as readily
to admit of the sieves or sifting surfaces being changed. The framed sieve
is supported externally on rollers or other suitable bearings, and is caused to
turn by means of a pinion or pinions taking into a toothed ring or rings on
the framed sieve, or the sieve may be caused to rotate in any suitable manner.
Within the interior of the sieve there is fixed a hopper and crushing rollers

page_text: in such manner that the crushed matters coming from the crushing rollers
descend on to the part of the sieve which is below them. And in order that
any matters which may have passed through between the crushing rollers, and
yet not sufficiently crushed to pass through the sieves, may be again raised
into the hopper, there is a shelf or shelves fixed longitudinally to the
interior of the sieve by which such matters are raised up into a position to
fall into the hopper, and thence pass again through between the crushing
rollers. When desired, the crushing rollers are arranged in a suitable
manner to be heated.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Robert Jobson in the Great Seal Patent Office on the
12th February 1859.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
JOBSON, of Wordsley, in the County of Stafford, Ironfounder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of August, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-second year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Robert Jobson, Her special licence that I, the said Robert
Jobson, my executors, administrators, and assigns, or such others as I, the
said Robert Jobson, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "IMPROVE-
MENTS IN APPARATUS FOR CRUSHING AND SIFTING," upon the condition (amongst
others) that I, the said Robert Jobson, my executors or administrators, by
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 Robert Jobson, 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:-

page_text: This Invention has for its object improvements in apparatus for crushing and
sifting. For these purposes a rotating sieve is used, and it is constructed
with circular ends and longitudinal bars, suitable for receiving, and having
fixed between them, perforated plates or frames of wire gauze or reticulate
plates suitable for sifting; and it is preferred that these sieves and the longi-
tudinal bars which receive them should be formed in such manner as readily
to admit of the sieves or sifting surfaces being changed. The framed sieve is
supported externally on rollers or other suitable bearings, and is caused to
turn by means of a pinion or pinions taking into a toothed ring or rings on
the framed sieve, or the sieve may be caused to rotate in any suitable manner.
Within the interior of the sieve there is fixed a hopper and crushing rollers
in such manner that the crushed matters coming from the crushing rollers
descend on to the part of the sieve which is below them. And in order that
any matters which may have passed through between the crushing rollers, and
yet not be sufficiently crushed to pass through the sieves, may be again raised
into the hopper, there is a shelf or shelves fixed longitudinally to the interior
of the sieve, by which such matters are raised up into a position to fall into
the hopper, and thence pass again through between the crushing rollers.
When desired, the crushing rollers are arranged in a suitable manner to be
heated.
Having thus stated the nature of my said Invention, I will proceed more
fully to describe the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Figure 1 is an end elevation of a machine combined according to my
Invention. Figure 2 shows a transverse section thereof. Figure 3 shows
the manner in which the sieves are fixed and retained in the spaces between
the longitudinal bars of the cylinder. The cylindrical frame a, a, is composed
of two rings, which I prefer to be made with flanches; these rings are con-
nected together by longitudinal bars of T iron, and at one or both ends of the
framed cylinder is fixed a toothed ring b, by which, when the framed cylinder
a, a, is supported by rollers c, c, c, at each end, motion is communicated to
the cylinder a, a, by a pinion or pinions, on an axis driven by any suitable
power. The rings of the framed cylinder rest on the rollers c, c, c, and the
flanches on such rings prevent the cylinder from getting out of position. The
cylinder a, a, is supported by two end frames, which carry the axes of the
rollers c, c, c, as shown in Figure 1. The sifting surfaces a¹, a¹, are fixed in
the spaces between the longitudinous bars of the cylinder by means of turn
buckles d, or other convenient means. Within the cylinder a, a, is suspended

page_text: a hopper e, e, which is carried by the end framings, as shown. Below the
hopper are two crushing rollers f and 9. The axes or necks of the roller g
have their bearings carried by the end framing, and the roller g is driven by
steam or other suitable power, and when desired the roller g may be made
suitable to be heated by steam or other means. The axes or necks of the
roller have their bearings in two weighted levers h, by which the roller fis
kept pressed to the roller g; by these means the materials to be crushed and
sifted being placed in the hopper, the same pass between the rollers f and g,
and become crushed by the rotation of the cylinder a, a. Such crushed
materials become sifted, and such portions thereof as do not pass through the
sieve surfaces are raised up by the inclined shelf i; one or more than one
such shelf may be used.
Having thus described the nature of my said Invention and the manner of
performing the same, I would have it understood that I make no claim
to any of the parts separately, but what I claim is the combination herein
described.
In witness whereof, I, the said Robert Jobson, have hereunto set my
hand and seal, this Eighth day of February, in the year of our
Lord One thousand eight hundred and fifty-nine.
Witness,
S. CARPMAEL.
ROBT. JOBSON. (L.S.)