Improvements in the Manufacture of Cement, Lime, and like Materials, and Apparatus connected therewith.
Year: 1894

page_text: Date of Application, 18th June, 1894
Complete Specification Left, 16th Mar., 1895-Accepted, 18th May, 1895
Improvements in the Manufacture of Cement, Lime, and like
Materials, and Apparatus connected therewith.
1, CHARLES EDWARD BLYTH, of Birdingbury Hall, Rugby, in the County of
Warwick, Cement Manufacturer, do hereby declare the nature of this invention to
be as follows:-
This invention relates chiefly to the manufacture of cement and lime and to
apparatus connected therewith.
In carrying out my invention I employ a sifter so constructed that it can be used
continuously without "ditching" or clogging, means being provided so that in the
case of hot cement or lime (that is to say, cement or lime direct from the mill
stones) the sifted material is subjected to a blast of cold air whereby it becomes
thoroughly aürated thus avoiding the necessity of laying it out in bulk for
cooling" as has hitherto generally been done.
My improved sifter is constructed of a number of panels or frames for receiving
the wire ganze through which the material is to be sifted. These panels are suitably
connected such as by means of pins, studs or bolts to a light frame preferably
hexagonal in cross section. The sifter or reel thus constructed is placed obliquely
and receives a rotary motion by any suitable means. The discharge end of the
sifter or reel is open and the feed end has an opening through which the material
to be sifted is fed by means of a conveyor or in any other suitable manner.
order to prevent the "ditching" of the mesh I apply to each side of the sieve one
or more knockers or hammers adapted to be operated as the sieve revolves so as to
strike the sieve, the jarring thus produced clearing the mesh from and preventing
any accumulation of the material.
In
My hammers or knockers are advantageously made of a curved rod fulcrummed
in a suitable position on the sieve panelling, the head or striker being made of a
suitable metal or material which is softer than iron, such as white metal. In
suitable positions in the casing within which the sieve revolves I provide adjustable
projections against which the tail ends of the hammers will strike, whereby the
hammer-heads are raised striking the sieve as they are released under the action of
suitable springs which are preferably made cf india-rubber.
In order to effect the "cooling" of the cement or other material which is
introduced into the sieve in a hot state and to keep the mesh of the sieve cool and
thereby prevent it expanding, I introduce into the sieve from the discharge end a
blast of cold air.

page_text: Improvements in the Manufacture of Cement, Lime, and like
Materials, and Apparatus connected therewith.
1, CHARLES EDWARD BLYTH, of Birdingbury Hall, Rugby, in the County of
Warwick, Cement Manufacturer, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
necertained in and by the following statement:-
This invention relates chiefly to the manufacture of cement and lime and to
apparatus connected therewith.
"
In carrying out my invention employ a sifter or screen 80 constructed that it
can be used continuously without "ditching or clogging, means being provided
so that in the case of hot cement or lime (that is to say, cement or lime direct from
the mill stone) the sifted material is subjected to a blast of cold air whereby it
becomes thoroughly aerated thus avoiding the necessity of laying it out in bulk
for cooling" as has hitherto generally been done.
My improved sifter is constructed of a number of panels composed of frames
filled in with wire-gauze through which the material is to be sifted. These panels
are suitably connected to a light frame preferably hexagonal in cross section. The
sifter or screen thus constructed is placed obliquely and receives a rotary motion
by any suitable means, The discharge end of the sifter or screen is open and the
feed end has an opening through which the material to he sifted is fed by means of
a conveyer or in any other suitable manner. In order to prevent the ditching
of the mesh apply to ench sieve one or more knockers or hammers adapted to be
operated as the sifter revolves so as to strike the same, the jarring thus produced
clearing the mesh from and preventing any accumulation of the material.
"
My hammers or knockers are advantageously made of a curved rod fulcrummed
in a suitable position on the sifter panelling, the heal or striker being made of n
suitable metal or material which is softer than iron, such as white metal. In
suitable positions in the casing within which the sifter revolves, I provide
adjustable projections against which the tail ends of the hammers will strike,
whereby the hammer heads are raised and strike the frame of the sifter as they
are released under the action of suitable springs which are preferably made of
india-rubber.
In order to effect the "cooling" of the cement or other material which is
introduced into the sifter in a hot state and to keep the mesh of the sieves cool and
thereby prevent it expanding, 1 introduce into the sifter a blast of cold air.
To enable my invention to be fully understood 1 will describe the same by
reference to the accompanying drawing, in which :-
Figure is a side elevation; and,
Figure 2 an end elevation of my improvod apparatus for use in the manufacture
of cement, lime and like materials; and,
Figures 3 and 4 are longitudinal and transverse sections respectively of the said
apparatus:
Figure 5 is a view, drawn to an enlarged scale, of one of the panels or frames;
And,
Figure 6 is an end view of the same.
is a skeleton frame preferably of hexagonal shape in transverse section, and bis
the shaft upon which the skeleton frame is mounted, the said shaft being carried in
bearings c. c attached to a casing d which encloses the sifting apparatus proper;
the said casing having suitable doors, such as e, for affording ready access to the
interior of the said casing. The shaft and consequently also the frame a are
arranged in an inclined position so that the material introduced at one end of the
same will gravitate towards the other end.

page_text: ✓ indicates one of my panels which are fixed around the several sides of the
skeleton frame by bolts or the like, cach panel comprising a frame g, Figures 5
and 6, filled in with wire-gauze h of suitable mesh according to the grade of product
desired. i, are the hammers or knockers which I employ for preventing the
accumulation of material in the meshes of the panels. As shewn in the drawing
these hammers are pivotted to cross-bars j, j on the panels and are each in the form
of a bent lever, one end of which carries the hammer head or knocker proper
whilst the other end, which is curved, is adapted during the rotation of the screen
to impinge against a projection & on the casing, as shewn most clearly in Figure 4.
in order to move the hammer heads away from the bars j, j. India-rubber springs l
or other suitable springs are arranged behind the bent ends of the said levers in
such a manner that whilst the said bent ends are in contact with the bark they
will be compressed whilst directly the levers are released the springs will react to
cause the hammers to strike the said bars j, j and thereby cause sufficient
vibration of the panels to disengage any material that may be in the meshes
thereof. The bark may be made adjustable so as to regulate the extent to which
the springs shall be compressed and consequently also the force of the blows
imparted by the hammers.
m is a spout or hopper which projects through the casing into the upper end of the
screen and serves to deliver the material to be sifted to the interior thereof. A-
shewn in the drawing, this spout is arranged in conjunction with an elevator
indicated by dotted lines n in Figure 2, the said elevator serving to lift the material
and deliver it into the spout m. As the material passes through the screen the
finer portions will fall into a trough beneath the screen, in the bottom of which
trough is a conveyer p which serves to convey the sifted material outside the
apparatus. The portions of material which do not fall through the meshes of the
panels are discharged at the lower end of the screen and, order to separate these
coarse portions of the material from the finer portions, I provide the dividing
partition q.
To introduce air into the screen for cooling the material therein I make the
shaft & hollow so as to form a tubular passage r, and with this passage I connect a
series of radial pipes s, s connected to a series of longitudinal pipes t, which latter
are perforated so that air which is introduced to the passage in a state of
compression will escape through the perforations in the pipes t, t and come into
contact with the material in the screen.
To drive off any light foreign bodies from the material passing through the
screen mount on the shaft b a fan or air-propeller u arranged at the discharge
end and adapted to be driven at a higher rate of speed than the shaft b so that the
current of air produced thereby travels through the screen in a contrary direction
to the material. As shewn in the drawing this fan is driven from a shaft v
through the medium of the pulleys we, over which a belt passes. The shaft o is
also connected with the screen by means of a sprocket chain passing over the
sprocket wheels y, y'. The shaft v derives its motion from a shaft through the
medium of bevel gearing, the said shaft carrying a belt pulley ¹.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :--
1. The improvements in the manufacture of cement, lime and like materials
consisting in passing such materials through a screen constructed substantially in
the manner herein before described and illustrated in the accompanying drawing.
2. In a screen for use in the manufacture of cement, lime and like materials, the
arrangement of knockers operated substantially as herein before described for the
purpose specified.
3. In a screen for use in the manufacture of cemeut, lime and like materials, the
provision of means whereby air can be introduced into the said screen substantially
as, and for the purposes, described.

page_text: 4. The manufacture and use of the improved apparatus for screening cement,
lime and like materials substantially as herein before described and illustrated in
the accompanying drawing.
Dated this 16th day of March 1895.
G. F. REDFERN & Co.,
4, South Street, Fiusbury, London, Agents for the Applicant.