IMPROVEMENTS IN SIEVING APPARATUS to
Year: 1884

page_text: I, WILLIAM DE MORGAN of 36 Cheyne Walk, Chelsea in the County of Middlesex
do hereby declare the nature of said Invention for "IMPROVEMENTS IN SIEVING
APPARATUS to bo as follows:-
My Invention has for its object to provide an Apparatus readily and cheaply
constructed and wherein the sieving or separating of various materials may be
effected in a rapid convenient and efficient manner.
The apparatus constructed according to my Invention consists of an upright
square or equivalently shaped box across which are placed superposed rows of
parallel rods the distance between the rods of each row being in accordance with
the nature of the material to be treated and the degree of fineness required. The
reticulated material which is used as the medium for sieving is stretched through
or over these rods so as to give a series of parallel zig-zag passages inclining first
in one direction and then in the other direction and so on alternately from the
upper to the lower part of the apparatus. The opening to every alternate zig-zag
passage is closed over at top so that the material to be sieved only passes into
every alternate passage left open. The zig-zag passages open at bottom alternately
in opposite directions so that whilst every alternate passage leads to one receptacle
the remaining intervening passages lead into another receiver. In each of the
reversely inclined portions of the passages every alternate side is closed or covered,
the other sides (vizt that side in each case upon which the material falls) being
formed of the unclosed reticulated wire or sieving medium. The material to bo
sieved pass from the hopper through the openings at the upper ends of each
alternate zig-zag passage the finer portions passing through the reticulations of the
inclined sides upon which they fall into the intermediate zig-zag passages which
are closed at top. This occurs in each series of reversely inclined portions of the
passages and eventually the material falls into the receptacles beneath the finer
portions which have passed through the reticulations or sieving medium falling
into one receptacle and the coarser portions which have not passed through the
reticulations or sieving medium passing into the other receptacle.
A similar result may be obtained (but with less sifting surface) by alternate series
of reversed or opposite zig-zags (instead of parallel ones) forming between them
diamond shaped spaces the upper sides of which are formed of open reticulated or
sieving medium the lower sides being covered or closed material to be sieved
passed into the reversed or opposite zig-zag passages between the diamond shaped
spaces and the finer portions pass into the said spaces and therefrom into a
receptacle into which all the said spaces lead. The zig-zag passages all lead into
another receptacle in which the coarser portions are received.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said William De Morgan.

page_text: I WILLIAM DE MORGAN of 36 Great Cheyne Row Chelsea in the County of
Middlesex do hereby declare the nature of my invention for "IMPROVEMENTS IN
SIEVING APPARATUS" and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
My Invention has for its object to provide an Apparatus readily and cheaply
constructed, and wherein the sieving or separating of various materials may be
effected in a rapid convenient and efficient manner and whereby there is obtained
a great extent of sifting surface in proportion to the space occupied by the
apparatus.
The apparatus constructed according to my Invention consists of an upright square
or equivalently shaped box across which are placed superposed rows of parallel
rods the distance between the relative position of the rods of each row being in
accordance with the nature of the material to be treated and the degree of fineness
required. The reticulated material which is used as the medium for sieving, is
stretched through or over these rods so as to form a series of parallel zig zag
passages inclining first in one direction and then in the other direction, and so on
alternately from the upper to the lower part of the Apparatus. The opening to every
alternate zig zag passage is closed over at top so that the material to be sieved only
passes into every alternate passage left open. The zig zag passages open at bottom
alternately in opposite directions so that whilst every alternate passage leads to one
receptacle, the remaining intervening passages lead into another receiver. In each
of the reversely inclined portions of the passages every alternate side is closed or
covered, the other sides (videlicet that side in each case upon which the material
falls) being formed of the unclosed reticulated wire or sieving medium. The
material to be seived passes from the hopper through the openings at the upper ends
of each alternate zig zag passage, the finer portions passing through the reticulations
of the inclined sides upon which they fali, into the intermediate zig zag passages
which are closed at top. This occurs in each series of reversely inclined portions
of the passages and eventually the material falls into the receptacles beneath, the
finer portions which have passed through the reticulations or sieving medium
falling into one receptacle, and the coarser portions which have not passed through
the reticulations or sieving medium passing into the other receptacle.
A similar result may be obtained (but with less sifting surface) by alternate
series of reversed or opposite zig zags (instead of parallel ones) forming between
them diamond shaped spaces the upper sides of which are formed of open reticulated
or sieving medium, the lower sides being covered or closed. The material to be
sieved is passed into the reversed or opposite zig zag passages between the diamond
shaped spaces and the finer portions pass through the reticulated sieving medium
into the said spaces and therefrom into a receptacle into which all the said spaces
lead. The zig zag passages all lead into another receptacle in which the coarser
portions are received.

page_text: And in order that the said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheets of Drawings the same letters of reference
indicating corresponding parts in all the figures.
Figures 1 and 2 represent in vertical section taken at right angles to each other
a sieving or screening apparatus constructed according to my Invention in which
the zig zag passages are arranged parallel to each other as herein before firstly
described and figures 3 and 4 are similar views of a modified arrangement in
which the zig zag passages are alternately reversed as hereinbefore secondly
described. Referring to figures 1 and 2 A is a box or chamber down through
which the substance to be sieved or screened passes. This box or chamber is
divided into a number of parallel zig zag passages a, a² the passages marked a³
being closed at their upper ends whilst those marked a are open to receive the
material to be sieved. These two sets or series of passages a and a³ communicate
at their lower ends respectively with two discharge tubes or passage b 62. The
reticulated or sieving material c is strained or stretched over rods d extending at
intervals across the box A. The upper end of the box or chamber A is provided
with a feeding hopper B and with distributing plates e for equalizing the feed of
the material to the several passages a. The material entering the passages a passes
over the inclined surfaces of the reticulated or sieving material c, alternately on
the opposite sides of the passages. That portion of the material which is too
coarse to pass through the meshes of the sieves descends to the bottom of the
passages a and out therefrom through the delivery spout 6 into a receptacle placed
in position to receive it, or it may be conducted into a mill or other crushing
apparatus to be further reduced or ground to be again passed through the sieving
apparatus if desired whilst the finer portion of the material which has passed
through the meshes of the sieves descends to the bottom of the box A through the
passages a², and out therefrom through the delivery tube b*. In order to prevent
the material which has passed through the reticulated surfaces into the passages a³
from again entering the passages a those portions c³ of the sides of the passages a³
onto which the material falls from the passages a are rendered impervious by a
covering or are without perforations or reticulations.
In the modification illustrated by figures 3 and 4 the zig zag passages instead of
being arranged parallel to each other are arranged at alternately reversed incli-
nations so as to form a series of diamond shaped spaces or passages a' between the
zig zag passages a. The material to be sieved is fed into the top of the passages a
and as it descends therein the fine portion passed through the reticulated material c
into the diamond shaped passages a descending thence to the bottom thereof and
out through the delivery pipe or spout b whilst that portion of the material which
is too large to pass through the meshes of the reticulated sieving material descends
to the bottom of the passages a and through the delivery pipe or spout b², and
may be thence conducted to a mill or other grinding apparatus to be further
reduced, to be passed again through the sieving apparatus if desired and this
operation may be repeated until the whole of the material is reduced to the
required degree of fineness.
The surfaces c* in the passages a² upon which the material falls from the
passages a are covered over or are without perforations or reticulations to prevent
the separated fine material from again entering the passages a.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
First-In sieving apparatus the employment of a combination of zig zag or
inclined passages through which the material to be seived or separated passes
alternately with other passages into which the finer portions of the material passes
through sieving or reticulated portions of the walls forming the divisions between

page_text: the two sets of passages so that the material passes from the apparatus in a
separated state as regards its degree of fineness substantially as hereinbefore
described.
Second-The sieving apparatus.constructed or arranged substantially as herein-
before described and illustrated in figures 1 and 2 of the accompanying drawings.
Third: The sieving apparatus constructed or arranged substantially as herein-
before described and illustrated in figures 3 and 4 of the accompanying Drawings.
Dated 17th day of February 1885.
WILLIAM DE MORGAN.