Year: 1887

page_text: Date of Application, 27th Aug; 1887
Complete Left, 28th May, 1888
Complete Accepted, 29th June, 1888
I, PIETER VAN GELDER, of Sowerby Bridge in the County of York, wing
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its principal object, improvements on the machines set forth
in my former patents No. 2470 of 1878 and No. 1083 of 1883.
In the specification of 1883 the machine is arranged so that the larger lumps and
pieces are thrown out at the end of the machine, while the finer portion goes through
the sieve and passes on to another set of sieves.
Now this invention is designed for the purpose of enabling the coarser portions and
lumps to be sieved a second or third time, while the finer portions from each sieve
do not pass through the rest of the sieves but are all brought together, either to
a single sieve below the rest, or to a spout. The invention also includes various
details of improvement.
In carrying out my invention for sieving chop middlings and flour I prefer to
divide the sieves longitudinally into two portions, so that I can separate two different
sorts in the same machine, one on each side of it. The middlings coming down from
the feeding apparatus pass along a stepped sieve in the manner described in the
aforesaid patent of 1883. The finer material falls through on to a shoot flooring or
tray separated longitudinally by a large number of small wooden divisions.
The shoot is preferably made of sheet iron lined above with a thin layer of wood, so
as to prevent moisture condensing thereon.
The small particles or fine middlings and flour run down the numerous longitudinal
channels, into which the shoot is divided, to the other end, from which a series of
curved pipes or shoots and straight pipes carry the fine or small material from the
upper sieve or sieves on to the bottom sieve.
The coarser material falling from the end of the top sieve enters a lower sieve
sloping in the opposite direction with a shoot similar to the one above, and
approximately parallel both to it and to the second sieve.
The coarser inaterial runs to the end of the second sieve and then passes away.

page_text: The finer material from all the sieves passing through the circular spouts enters
another sieve all in the same frame up through which
column of air passes.
Below this sieve a series of scrapers are placed so that by simply pulling a handle
to and fro either automatically or by hand the lower surface of the sieve is scraped.
The flour falls through this fine bottom sieve, but the middlings pass on to the end,
and fall down a spout also provided at the bottom with longitudinal partitions.
The partitions on the sieves and on this spout are to cause the material to pass
longitudinally, as, owing to the peculiar arrangement for shaking the sieves, they
would otherwise collect in heaps on each side rather than go straight.
Above the upper sieve near the end I prefer to place a horizontal or nearly
horizontal baffle plate, and in this baffle plate at one or more points I place a raised
grid or grids with a few holes in them.
The object of this baffle plate is to form a quiet spot for the dust escaping from the
top sieve to fall upon.
The object of the grids is to allow a little air from even the lower part of the sieve
to fly up into the exhaust.
All these sieves are fixed in the sieve frame as set forth in my previous patents.
Datod this 26th day of August 1887
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in or Appertaining to Sieving Apparatus.
I, PIETER VAN GELDER, of Sowerby Bridge, in the County of York, Milling Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement: 1
This invention has for its principal object, improvements on the machines set forth
in my former patents No. 2470 of 1878 and No. 1083 of 1883.
In the Specification of 1883, the machine is arranged so that the larger lumps and
pieces are thrown out at the end of the machine, while the finer portion goes through
the sieve and passes on to another set of sieves.
Now this invention is designed for the purpose of enabling the coarser portions and
lumps to be sieved a second or third time, while the finer portions from each sieve do
not pass through the rest of the sieves, but are all brought together, either to a single
sieve below the rest, or to a spout. The invention also includes various details of
improvement.
The invention may be described by reference to the accompanying drawings, in
which
Figure 1 is a vertical section through the centre of a tier of sieves and sieve frame
constructed in accordance with my invention.
Figure 2 is a similar section on line - Figure 1.
I will describe the invention as applied to the sieving of chop middlings and flour,
though it is applicable with but slight modification to the cleaning or sieving of grain,
or of many other materials. A is the sieve frame for carrying the sieves. It is
suspended in any suitable manner by flexible hangers, and has a continuous shaking
motion imparted to it, the said motion being preferably circular and produced by
means of balanced cranks as described in the aforenamed specification No. 1083
of 1883, or by a single balanced crank. When employing the apparatus for sieving
chop middlings and flour, it is preferable to divide the sieves longitudinally into two
portions by a partition A', Figure 2, so that two different sorts can be separated in the
same machine, one on each side of the partition. The middlings coming down from
the feeding apparatus pass on to and along a stepped and preferably sloping sieve B in
the manner described in the aforesaid patent specification of 1883. The finer material
falls through on to a slightly inclined shute, flooring, or tray C, separated longitudi-
nally into a number of divisions by small wooden ribs or partitions c.
The shute is preferably made of sheet iron c¹ lined above with a thin layer of
wood so as to prevent moisture condensing thereon, and the ribs c may be let into
or otherwise secured to the wood.

page_text: The partitions e on the sieves and on the spout J hereinafter described, are to cause
the material to pass longitudinally, as, owing to the peculiar arrangement for shaking
the sieves, they would otherwise collect in heaps on each side of the latter rather than
go straight.
The small particles or fine middlings and flour run down the numerous longitudinal
channels, into which the tray is divided, to the lower end thereof. Here a series of
curved pipes or a shute D, and a series of straight pipes D' carry the fine or small
material from the upper sieve or sieves B on to the bottom sieve E, which may be
placed either horizontal or slightly inclined.
The coarser material falls from the lower end of the top sieve B upon a lower
sieve B', sloping in the opposite direction, and also provided with a tray
similar to
the upper one (, and approximately parallel both to it and to the second sieve B'. The
tray discharges its contents over its lower end on to the lower sieve E.
The coarser material discharged at the end of the second sieve B¹ passes away down
a shute F.
By the foregoing arrangement, the finer material from all the upper sieves passes
onto the lower sieve E all the sieves and trays being in the same frame, through
which a current of air passes in any well known manner.
Below the sieve E, à series of scrapers G are placed so that by simply pulling a
handle to and fro either automatically or by hand, the lower surface of the sieve is
scraped.
As shown in Figure 2, the handle g is attached to a rod secured to one of the
scrapers, and passing through to the outside of the frame A, the handle being retained
in position by a pin or plate g' on the frame, which enters a hole or nick in the handle.
The scrapers are all secured to side pieces G' with which they form a rigid frame,
and their upper edges are cut away so as to present a narrow scraping surface to
the sieve. The scrapers are supported by plates g² attached to the framing of the
sieve.
The very fine flour passes through the bottom sieve E on to an inclined tray H,
whence it is led away by a shute H. The coarser flour and fine middlings pass away
over the end of the sieve, and fall down the spout J, which is also provided at the
bottom with longitudinal ribs or partitions c.
Above the upper sieve and near the lower end thereof, I prefer to place a horizontal
or nearly horizontal baffle plate K, and in this baflle plate at one or more points I
place à raised grid or grids with a few holes in them. Or in place of perforated grids
I may simply employ a few open projecting rings & as in Figure 1.
The object of this baffle plate is to form a quiet spot for the dust escaping from the
top sieve with the blast to fall upon.
The object of the grids or rings is to allow a little air from the lower part of the
sieve to fly up through the baffle plate into the exhaust.
When the apparatus is used for sieving grain and similar granulated materials I
may place above the upper end of the upper sieve B a coarse sieve B2 similar to that
described in my specification of 1883 for the purpose of arresting pods, straw, nails, or
other large articles, which are led off by a spout b.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1st. A sieving apparatus in which two or more sieves preferably stepped, alternating
with a lower series of inclined trays, preferably partitioned, are arranged within a
shaking frame above a lower sieve, each of the said upper sieves communicating with
the one next below it, but each of the said trays communicating direct with the
aforesaid lowest sieve, substantially as and for the purpose described.
2nd. In combination with a shaking tray or shute having a horizontal circular
shaking motion, the longitudinal ribs or partitions attached to the upper surface
thereof for preventing the fine material from accumulating at the sides of the tray, and

page_text: for causing it to travel in a longitudinal direction, notwithstanding the circular motion
of every part of the sieve, substantially as set forth.
3rd. The combination of a sieving apparatus substantially as described, and a baffle
plate such as K placed above the lower end thereof, and provided with one or more
open upwardly projecting rings or their equivalent, substantially as and for the
purposes described.
4th. The balanced sieving apparatus having a horizontal circular motion and
constructed and arranged as a whole substantially as and for the purposes herein
described, no claim being made for anything set forth in my two previous patents
Nos. 2470 of 1878 and 1083 of 1883, but only for novel improvements herein
set forth.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.