Improvements in Apparatus for Sifting and Screening Purposes, also Applicable to Stone-breaking Machines.
Year: 1884

page_text: Improvements in Apparatus for Sifting and Screening Purposes,
also Applicable to Stone-breaking Machines.
We JOHN EDWARD STAFFORD of Swindle-hurst house, Burnley, in the county
of Lancaster, Civil Engineer, and JAMES TOWNSLEY PEARSON of 3, Albert Street
of Burnley aforesaid, Inspector of Works, do hereby declare the nature of our
said invention for "IMPROVEMENTS IN APPARATUS FOR SIFTING AND SCREENING
PURPOSES, ALSO APPLICABLE TO STONEBREAKING MACHINES to be as follows:-
"
This invention relates to an improved means of, and apparatus for sorting and
screening, Crushed or broken Stones, Coal, or other fragmentary substances.
The apparatus consists of a vertical frame, in which are placed a series of
sieves or screens one above another, and differing from each other in fineness of
gauge.
The fragmentary substances to be sorted or separated are charged in at the top
of the apparatus, to which a motion more or less active, may be imparted by a
crank or like equivalent, so as to cause the fragments to slide backwards and
forwards on the surface of each sieve or screen, urging those fragments capable of
passing through the first sieve or screen on to the surface of the next and so on
through the rest.
Each sieve or screen has a slight inclination from one side of the frame to the
other, sufficient to cause, during the foregoing operation, a slight gravitation or
sliding movement to those fragments incapable of passing through the meshes of
the respective sieves or screens, from the surfaces of which they are collected and
discharged through shoots, and may be deposited in carts or other receptacles in
separate and distinct assortments.
This construction of apparatus is also applicable for sifting grain and the like.
When the apparatus is used in combination with a stone breaking machine or
similar apparatus, the fragments incapable of passing through the meshes of the
first sieve or screen, are preferably conveyed back to the jaws of the breaker, by
means of an endless chain of buckets, which may be also used for charging the
breaker or like apparatus with materials to be crushed or broken.
By this arrangement of apparatus, a considerable saving of labour is effected, and
a more effectual separation of crushed or broken materials ensured.
THOS. RICHMOND,
Agent for the Applicants.

page_text: also Applicable to Stone-breaking Machines.
We, JOHN - EDWARD STAFFORD of Swindle hurst House, Burnley, in the County
of Lancaster, Civil Engineer, and JAMES TOWNSLEY PEARSON of 3, Albert Street,
of Burnley aforesaid, Inspector of Works, do hereby declare the nature of our said
invention for "IMPROVEMENTS IN APPARATUS FOR SIFTING AND SCREENING
PURPOSES, ALSO APPLICABLE TO STONE BREAKING MACHINES, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
The apparatus consists of a vertical frame, in which are placed a series of
sievos or screens, one above another, and differing from each other in fineness of
gauge.
The fragmentary or other substances to be sorted or separated are charged in at
the top of the apparatus, to which a motion, more or less active, may be imparted
by a crank or other like equivalent, so as to cause the fragments to slide backwards
and forwards on the surface of each sieve or screen, urging those fragments capable
of passing through the first sieve or screen, on to the surface of the next, and so
on through the rest.
Each sieve or screen has a slight inclination from one side of the frame to the
other, sufficient to cause, during the foregoing operation, a slight gravitation or
sliding movement to those fragments incapable of passing through the meshes of
the sieves or screens, from the surface of which they are collected and discharged
through shoots, and may be deposited in carts or other receptacles, in separate and
distinct assortments.
The apparatus may be used separately or in combination with stone crushing
machinery; when the latter the fragments, incapable of passing through the
meshes of the first sieve or screen, are preferably conveyed back to the jaws of
the breaker by an endless chain of buckets, which may also be used for charging
the breaker with materials to be crushed or broken.
And in order that our invention may be properly understood, and readily carried
into effect, we have hereunto attached the accompanying sheet of drawings,
reference being had to the figures and letters marked thereon; the same lettera
referring to the same parts in the various figures.
Fig. 1, is an elevation, and Fig. 2 a plan shewing the arrangement and combi-
nation of the separator with a stone crushing apparatus, and the manner of
conveying materials to the same by an elevator or chain of buckets, which return
the fragments incapable of passing through the meshes or spaces of the first sieve
or screen of our improved separator, to the jaws of the breaker, and thereby
ensure a perfect division or disintegration of the substances operated on. Fig. 3 is
another arrangement of the separator with a stone breaker, in which arrangement
the materials to be operated on, are or may be fed between the jaws of the breaker
without the assistance of the elevator, and cast out below as fragments into a

page_text: semi-circular trough, from which the elevator buckets convey them to the separator
for assortment.
The fragments unable to pass through the meshes or spaces of the first sieve or
screen are returned direct, by a shoot, to the jaws of the breaker for further
reduction.
The separator may also be used for the separation of grain, or for assorting
substances not necessarily crushed or broken.
We will now describe more fully the construction of our improved separator,
before entering upon a further description of its arrangement in combination with
stone crushing machinery.
The separator represented in the drawings consists of a vertical frame having
four side walls, within which are arranged the sieves or screens A, B, C and D,
differing from each other in fineness of gauge, and so disposed within the frame as
to incline in a transverse direction to each other. The frame is suitably jointed or
mounted on the bracket E, and is actuated in a vibratory manner by means of an
eccentric F and pitman.
This vibratory movement causes a sliding to and fro of the fragments, when
placed for separation or assortment on the sieve or screen A, urging those fragments
(which are less than the size of the mesh of the first sieve) to fall upon the surface
of the second sieve B, where the next assortment takes place, and so on through
the meshes of sieves C and D. Whilst the smaller or finer fragments are being
urged through the meshes of the first, second, third and fourth sieve or screen
during the foregoing operation, each sieve or screen will have netted or retained
upon its surface fragments, in accordance with the size of mesh, with which it is
provided. These sieves or screens are arranged in a transverse position in respect
of each other, and respectively terminate in shoots or spouts A¹ B¹ C¹ and D¹ one
of which projects from each side wall of the apparatus; the inclines of the sieves
or screens being just sufficient, together with the vibratory movement, to cause the
fragments retained or netted upon each respective sieve or screen, to gradually
glide down the incline to the shoots, where they are discharged into carts or
other recepticles in separate and distinct assortments, from each side of the
apparatus.
To prevent the meshes of the sieves or screens from becoming choked by the
fragments, each sieve may be connected at the end of the incline to a vertical rod
or bar, which is provided at its lower extremity with a bowl or pulley, which
bears against a cam having a sharp indentation, in which the bowl suddenly drops.
The shock produced by the collision will tend to release or throw out any
obstructive fragment, which might be jammed in the meshes.
When our improved separator is used in combination with stone crushing
machinery, the fragments or substances, too large to pass through the first sieve or
screen A, are discharged down shoot A' to the elevator buckets H, which convey
them to the jaws of the breaker for further reduction, whilst the shoot I, seen in
Figs. 1 and 2, continually convey the material, as it is crushed or broken by the
breaker, direct to the sieve or screen A for separation or assortment.
Fig. 3 represents a slight modification in the arrangement shewn in Figs. 1
and 2. The fragments passing the movable jaw J and stationary jaw K, are
conducted into the semi-circular trough L, from whence they are taken by the
elevator buckets or scoups H, to the shoot M, down which they slide to the
surface of the sieve A, from whence those fragments, incapable of passing through
its meshes, glide from its surface, or are returned down the shoots A¹ and N to the
jaws of the breaker for further disintegration.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is
Firstly. The arrangement and construction of apparatus as above described, for
separating or assorting substances by means of a series of inclined sieves or screens

page_text: "
.transversely arranged in respect of each other, substantially as, and for the purpose
specified.
Secondly. The shoot I to convey material as it is crushed or broken direct to
the screen A. for assortment, as shown is Figs. 1 and 2.
Thirdly. The semi-circular trough L, as described for the purpose specified.
Fourthly. The general arrangement and combination of the separator, with stone
'crushing machinery substantially as specified.
Today of Ontahan 18OK
THOS. RICHMOND,
Agent for the Applicants. 10