Year: 1888

page_text: I PERCY JOHN NEATE, of No. 5 Newton Terrace, Rochester, in the County of Kent,
Engineer, do hereby declare the nature of this invention to be as follows:-
My Invention relates to an improved method of constructing and hanging the
sieves of machinery for the manufacture of Portland and other cements, and is
applicable to rotary sieves generally.
The frame of the sieve consists of sets of arms, preferably six to a set, projecting
from bosses on the central shaft of the sieve. The arms of the respective sets are
aligned with other. A longitudinal metal bar connects each line of arm ends, and
is preferably of a plano-convex section with the flat side outwards. Screwed studs,
clamping plates, and nuts or other equivalent holding down devices project from the
flat sides of the said bars at suitable and symetric intervals by means of which
the removable sections which together constitute the sieving-surface can be fixed
to the frame of the sieve.
Each of the said sections consists of two longitudinal bars, a suitable number of
parallel arcs, and a sheet of wire cloth. The arcs are, preferably, of wood connected
at their extremities by the longitudinal metal bars which are of preferably a semi-
segmental section such as would he enclosed by the sine, versed sine, and are
subtending an acute angle with their convex sides outwards so that the flat side or
versed sine of one bar will be parallel to and nearly in contact with the outer flat side,
or versed sine, of the adjacent bar of the next section while the longer flat sides or
sines of two adjacent semi-segmental bars will almost cover the flat outer side of one
of the plano-convex fixed bars leaving room only for the studs to project through.
The wire cloth is fixed to the inner face of the said arcs.
The material undergoing the process of sieving will slide over the convex face
of the longitudinal bars of the sieve frame smoothly and without dropping heavily
upon the wire cloth.
The arcs of one set of sections lie in the same respective planes when the said set is
fixed on the sieve frame. Brushes can therefore be easily applied to the periphery
of the drum provided they are of the same length as the distance between a pair of
ares and the bristles will easily give and return as the longitudinal bars of a section
are rotated past them.

page_text: The second part of my invention consists in means by which the sieve may he
inclined more or less as may be required to adapt it to the nature of the particular
material which is being passed through it and as a ready means of pressing the wire
cloth against a fixed set of brushes suspended over and parallel to the axis of
the sieve.
.
The front bearing of the central shaft of the sieve is made longer than usual and
has an U shaped carriage depending from it. A bevel wheel is keyed on the outer
end of said shaft and therefore revolves between the two arms of the said carriage.
The latter is adapted to swivel upon a horizontal pin at right angles with the axis of
the central shaft. The outer extremity of the said carriage has a second bearing
formed in it at right angles with, but in the same plane as, the said front bearing and
in this second bearing one end of a counter shaft is carried. One or preferably, two
pinions adapted to be thrown in and out of gear alternately are provided upon the
countershaft and orfe of them is always in gear with the above mentioned wheel
on the central shaft, provision being thus made for reversing the direction of
rotation.
The other end of the countershaft is carried either on a similar device attached to
another sieve or on a bearing sliding in a quadrant, or if the change in the angle
of inclination be small and the countershaft comparatively long an ordinary pillow
block may be used without special adjustment.
The rear end of the sieve is carried in a pillow block or in a sleeve bearing
suspended by an adjustable rod and either hanging free or sliding in quadrantal
guides as may be desirable.
The counter shaft is preferably driven by means of a belt from a shaft parallel to
and in the plane intersected by the axes of the countershaft and horizontal pin above
mentioned when the sieve is in its mean position for the tightness of the said belt will
not be materially affected by any alteration in the inclination of the sieve within wide
limits.
It is usually advisable for the further protection of the wire cloth to attach internal
perforated screens to the radial arms so as to screen off the large pieces of material
and to deliver them at the end of the sieve without coming in contact with the
wire cloth.
TAT
air 1
. 1000
PHILLIPS & LEIGH,
Agents for the Applicant.

page_text: Improvements in Rotary Sieves.
I, PERCY JOHN NEATE, of No. 5, Newton Terrace, Rochester, in the County of
Kent, 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:-
My invention relates to an improved method of constructing and hanging the sieves
of machinery used in the manufacture of Portland and other cements; and is
applicable to rotary sieves generally.
In order that my invention, and the means by which it is to be carried into practical
effect, may be thoroughly understood, I will now proceed to describe the same in detail,
referring in so doing to the accompanying drawings which are to be taken as part of
this specification and read therewith.
Fig. 1 is a sectional side elevation taken on the line A-B of Fig. 2, and illustrates
the application of my invention to a double skin rotary sieve.
Fig. 2 is a plan of a pair of coupled double skin rotary sieves corresponding with
Fig. 1.
Fig. 3 is a transverse section, partly in elevation, taken on the line C-D of
Fig. 1.
Fig. 4 is a plan of the internal face of a removable section of the outer sieve-
skin.
Fig. 5 is a detail transverse elevation illustrating the method of fixing the removable
sections of the outer sieve-skin upon the skeleton thereof. It is taken on the
line Y-Z of Fig. 4.
E is the main shaft of a sieve; F, the inner skin; F¹ the outer skin; and f, the
sets of arms upon the shaft E. As the inclination of a sieve is only small, some of
the stuff might drop out from between the two skins through the top end of the sieve,
during the time it is at work. To prevent this I introduce segmental filling pieces f"¹
into the top-end set of arms.
The arm-ends, or eyes, 12, being radial extensions of the well known skeleton of
the inner skin, are utilized for the double purpose of furnishing convenient and
practically suitable means for the fixation to the sets of arms f, of a series of
longitudinal bars G, of a special section, which, in conjunction with the said eyes,
constitute the skeleton of the outer sieve-skin; as well as for the fixation to the said
skeleton of the removable outer-skin sections H.
I do
The said longitudinal bars G are, preferably, plano-convex in cross section.
not absolutely confine myself to the use of bars of this section, but it is nevertheless
the one which I prefer, because it gives better results than any other with which I am
acquainted. The faces of the eyes are concaved to receive the convex faces of the
bars, and both bars and eyes are fitted with counter-sunk bolts and nuts g, or other
equivalent holding down device.
The reason why a plano-convex section is more advantageous for the longitudinal
bars G than any other, and especially. than those of a square section as heretofore
used is as follows:
The stuff on the inner surface of the outer skin will rise and roll up the convex
faces of the bars without jumping, and then roll down on to the next sheet of sieving
material without bumping and injuring it.

page_text: With reference to the perforated material of which both skins aro made, I do not
confine myself to either perforated plates or wire cloth, but may use either.
1 fix studs g' at symmetric and corresponding intervals in the bars G, for
the purpose of holding the removable sections H down upon the skeleton of the
outer skin.
Each of these removable sections consists of a number of arcs h, a pair of bars
of a semi-segmental section connecting the said arcs by their respective ends, and a
sheet of suitable sieving material h. The latter is laid upon tho inner, i.e., the concave
faces of the arcs h, to which it is secured by any convenient device, e.g., strips and
screws. The arcs and bars h¹ are, preferably, of wood and metal, respectively.
A removable section may be as long as the sieve, or there may be more than one
section in a line.
Semi circular grooves are formed in the flat adjacent side faces of the bars for
the purpose of allowing them to fit close up to each other, around the studs g¹, when
the sections are laid upon the bars G.
I, I are saddle-shaped metal clamps with sides i, i, (shewn in Fig. 2 and by dotted
lines in Fig. 5). Each clamp embraces the adjacent ends of two arcs h, and the said
two ends are consequently held to the bar G by one and the same stud and nut.
The arcs of any one set are consequently truly aligned with each other. A cramp I
is not only saddle-shaped so as to lie closely down upon the tops of the two adjacent
arc-ends, but it embraces the said ends by its sides i, i; and as the clamp is quite
rigid, it is impossible for any warping tendency, which may be latent in the arcs,
to twist them out of their alignment. The clamp sides i, i are also let into the
arc-sides, flush therewith as shown in Fig. 4, so that there is not any projection to
interfere with the even contact of the brushes and sieve-surface during the operation
of machine-brushing.
The advantage derivable from the above described construction of outer skin is in
connection with the brushing of a rotary sieve otherwise than by hand, and while it
is at work. It must be borne in mind that when a rotary sieve has two skins, the outer
one must be made in removable sections. The longitudinal bars heretofore used have
been of a square, and comparatively speaking massive section. With such bars,
brushing of the sections by hand was compulsory, inasmuch as the projection of the
bars above the periphery of the skin rendered the machine brushing of the latter
impracticable, for the reason that as the rotation of the sieve brought a bar up to the
brush, the latter would be raised off the skin, and kept off until after the bar had
passed the brush, so leaving a band of skin upon each side of the bar untouched by
the brush. And besides this, the brushes would themselves be rapidly destroyed by
contact with the said bars.
According to my novel application of bars of semi-segmental section to the
construction of the outer skin of a rotary sieve, there is no abrupt projection of
bar-material above the skin-surface, for it must be borne in mind that the two semi-
segmental bars will present only a low convex projection, over which the brushes
will readily rise and promptly return. Consequently hand-brushing may be dispensed
with, and the whole perforated surface be effectually brushed, without stopping the
sieve, by simply bringing the latter into contact with the brushing device.
The second part of my invention consists in means by which the sieve may be
inclined, more or loss as may be required, to adapt it to the nature of the particular
material which is to be passed through it; and also in improved hanging and
driving gear.
The upper bearing J of the main shaft E is made longer than usual, and has a
U-shaped carriage K depending from it. This carriage is not necessarily U-shaped
only. I have shown this shape in the drawings, inasmuch as it is a convenient one
if the caps are to be removable. Otherwise it might be elliptical so as to embrace the
pair of mitre gears; or, if preferred, it may be made to completely surround and
encase the said gears.
'
Both the bearing and carriage above mentioned are adapted to swivel upon a
horizontal pink carried by a pillow-block in a line at right-angles with the axis of

page_text: the shaft E. The pink may be below the shaft E, as illustrated, or above it, or it
may be adapted to be in the same plane with it, whichever arrangement may be the
most convenient. Its axis will always be parallel with that of the countershaft
described further on, and at right angles with that of the main-shaft.
The lower tail-bearing J of the main shaft is adapted to be raised or lowered
between a pair of arc-shaped guides struck from the axis of the pin & as a centre.
The raising and lowering device consists of a screw, pivotally connected to the
bearing J, and a hand-wheel m supported by a gimbal n in crutches o formed upon
the top of the guides. Any other suitable and equivalent mechanism for raising and
lowering the said bearing may be adopted.
P, Pare the brushes, each one as long as the clear sieve-surface between a pair of
arcs. They are supported in an inclined position, and at a suitable distance above the
sieve for the latter to be brought up against them by the actuation of the hand
wheel m.
I wish it to be distinctly understood that I do not confine myself to stationary
brushes, but may use circular brushes adapted to be rotated around their axes during
the operation of brushing, or may use any other suitable brushing arrangement.
The front extremity of the carriage K above mentioned has a second bearing q
formed in it to receive a countershaft R, upon which is fixed a driving pulley r.
This countershaft is preferably driven by means of a belt, or belts, from a shaft
parallel to both pin and countershaft, and lying in the diagonal plane intersecting the
axes of the said countershaft and horizontal pin when the sieve is in its mean position;
for the tightness of the belts will not be materially affected by any alteration in the
inclination of the sieve within wide limits.
Sis a bevel wheel fast upon the end of the main shaft, and s, s' are a pair of bevel
pinions adapted by any suitable device to be put, respectively, either in or out of gear
with the bevel wheel S, for the purpose of driving the sieve in either direction.
The practical advantage of the combination of the carriage adapted to swivel on a
pink, and to provide bearings for both the main and the countershaft, is, that the
front end of the main shaft stops short of the countershaft, instead of, as in some
similarly circumstanced combinations already known in connection with rotary sieves,
occupying a position which bars the continuation of the said countershaft past the
main shaft. As a result of being able, according to my invention, to carry the
countershaft past the main shaft end, I have one continuous shaft providing room for
the mounting of the two pinions 5, $1.
The abovo description of the devices I make use of for driving a sieve in either
direction, and bringing it into contact with the brushes, applies to all the sieves in one
plant irrespective of their number.
When there is only one sieve in a plant, the opposite end of the countershaft R may
be carried in any suitable bearing. Such a bearing will be adapted to swivel in
accordance with the elevation or depression of the countershaft, caused by the change
in the angle of inclination of the main shaft E; or if the said change be small and
the countershaft long, an ordinary pillow block may be used without special adjustment
being provided for.
But when there are, as illustrated in Fig. 2, a pair of sieves in a plant, then is the
countershaft continued past them both, its full bearings being furnished by the
respective carriages already described. There may be more than two sieves in one
plant, but I prefer that they should be arranged in pairs as illustrated in Fig. 2.
Having now particularly described and ascertained the nature of my said invon-
tion, and in what manner the same is to be performed, I declare that what
I claim is :-
1. The combination with the skeleton of a double skin sieve, of removable outer
skin sections adapted to produce by their assomblage an outer skin tree of obstructions
on its outer face to the operation of brushing, and on its inner face, to the regular
rolling motion of the stuff, as set forth.

page_text: 2. The combination of arcs, plano-convex and semi-segmental bars, and a sheet of
sieving material, producing a removable section as set forth.
3. The combination of arcs and clamps having sides, as and for the purpose set
forth.
'
4. The combination of brushes as long as the clear distance between two arcs of
the outer skin of a rotary siove, removable outer-skin sections.free of projections between
the arcs, and arcs received in spaces between the brushes during the operation of
brushing, the said combination being adapted to effect the efficient brushing of every
portion of the said skin when the brushes and it are brought into contact as set
forth.
5. The combination with the main shaft of a rotary sieve, of countershaft, carriage
adapted to furnish bearings for both main and countershaft, and axis upon which the
said carriage is adapted to swivel, as and for the purpose set forth.
1
" n
3000
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant..
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant..