Year: 1885

page_text: шапагаты, кото, сощени, али опо
I WILLIAM SAVIDGE AKERMAN, of Bridgwater in the County of Somerset,
Cement Manufacturer, do hereby declare the nature of this Invention to be as
follows:
My Invention relates to an improved Mill for crushing, pulverizing, and sifting
Minerals, Cement, and other materials; and consists in the construction com-
bination, and arrangement of parts, hereafter described.
The Mill consists of superposed sets of edge runners, pans, and screens, of
peculiar construction and arrangement, whereby the materials, after being sub-
mitted to the action of the topmost set of runners, is sifted; the finer portions
being separated, and conveyed away for sacking, and the coarser portions passed
down to the set next below, and so on, in succession throughout the series.
The several sets of edge runners, and pans, are alike in construction, except that
they are graduated as to size, and weight, as may be necessary, and that the
topmost set may be serrated, or corrugated if necessary, whilst the others would
generally be plain; or the whole, or any number of the sets, might be corrugated,
or plain, according to requirements, and the nature of the material to be crushed
and pulverized, or ground.
The several sets of edge-runners are connected to the same vertical shaft, the
cross shaft of each pair of edge-runners being connected to the vertical shaft by an
eye, or hollow coupling, permitting of the cross shaft rising with the runners, as
the material to be ground comes beneath them. The runners are, and the pans on
which they run are, of corresponding conical, or bevelled form, (and, preferably, of
such relative dimensions that the circumference of the pan will be equal to one,
two, or more revolutions of the runners, both at the inner and outer circle of the
roller path,) whereby a greater extent of grinding surface is obtained, and skidding,
or jumping of the runners on their path, is avoided.
The pans are stationary, being supported on suitable pillars beyond their
circumference, and the whole series is enclosed in a casing constructed in sections,
and with double walls for the purpose hereafter described. Above each pan is a
central hopper with spouts, carried round by the vertical shaft, for delivering the
matters to be ground into the pan in front of each runner, and beneath each pan is

page_text: an inverted conical sieve, on which are received the matters that fall off at the
circumference of the pan, after being subjected to the action of the runners.
Beneath this screen is fixed a conical shoot (coned the reverse way to the screen)
whereby the fine flour or dust which has passed through the meshes of the screen,
is conveyed to a circumferential spout, leading into the double walls of the external
casing, and is thereby delivered to a receiving hopper at the bottom of the Mill.
The central portion of the screen is not perforated, and has a central aperture by
which the coarse meal, that does not pass through the screen, is delivered to the
hopper supplying the set of edge runners next below. The conical screen, and
shoot, are suspended loosely, and receive a vibratory, or shaking motion, from
tappets on the vertical shaft striking lugs on the inside of the central delivery
aperture of the screen. Scrapers and brushes attached to arms carried round by
the vertical shaft, may, if required be applied upon the pans and sieves, for
preventing the adhesion of the reduced material thereto.
Beneath the screen of the lowermost set, is the hopper for receiving the products
of the siftings by the several screens. This hopper is provided with doors for
discharging the contents into sacks, or other receptacles, and with a central spout
for receiving the coarse residue from the last screen, and a separate discharge
aperture.

page_text: Improvements in Mills for Crushing, Pulverizing, and Sifting
Minerals, Stone, Cement, and other Matters.
I WILLIAM SAVIDGE AKERMAN of Bridgwater in the County of Somerset,
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 ascertained
in and by the following statement:―
My Invention relates to an improved mill for crushing, pulverizing and sifting
minerals, cement, and other materials. The mill consists of sets of edge runners,
pans, and screens arranged in superposed tiers whereby the materials after being
submitted to the action of the topmost set of runners is sifted, the finer portions
being separated and conveyed away for sacking and the coarser portions passed
down to the set next below and so on in succession throughout the series.
Reference is to be had to the accompanying drawings forming part of this
specification, wherein figure 1 represents an elevation (partly in vertical section) of
the improved mill; figure 2 a plan or horizontal section of the same on line 1-1
figure 1; figure 3 a face view of one of the edge runners; and figure 4 a plan of
a detail. The same letters of reference indicate the same parts in all the figures..
The several sets of edge runners and pans are alike in construction, except that
they are graduated as to size and weight as may be necessary and that the
topmost set may be. serrated or corrugated if necessary (the corrugations of the
runners meshing with those of the pan) whilst the others would generally be plain,
or the whole or any number of the sets might be corrugated or plain according to
requirements, and the nature of the material to be crushed and pulverized or ground.
The several sets of edge runners or rollers A are driven by the same vertical
shaft B, the cross shaft C of each pair of edge runners being connected to the
vertical shaft by an eye or hollow coupling D permitting of the cross shaft rising
with the runners as the material to be ground comes beneath them, the shaft B
being made in lengths coupled together by the eyes D which are made in halves
bolted together. The cross-shaft C is prevented from shifting longitudinally in the
eye by a cross pin c working in vertical slots with the eye. The runners or
rollers A and the pans E on which they run are of corresponding conical or bevelled
form (and preferably of such relative diameters that the circumference of the pan
will be equal to one two or more revolutions of the runners both at the inner and
outer circle of the roller path) whereby a greater extent of grinding surface is
obtained and skidding or jumping of the runners on their path is avoided. The
pans E are stationary, being provided with lugs supported on bracket arms
projecting from the pillars F of the frame which stand clear of the circumference
of the pans. A central hopper G is fixed to the vertical shaft B above each pan E,
each hopper being provided with a pair of spouts g for continuously delivering the
matters to be ground on to the pan in front of the runners, the hopper and spouts
being carried round with the shaft. Beneath each pan E is hung an inverted
conical sieve H on. which are received the matters that fall off at the circumference
of the pan above, after being subjected to the action of the runners. With each
of these screens H (except the lowermost one) is combined a conical shoot I placed
beneath the screen and coned the reverse way thereto for discharging circum-
ferentially the fine flour or dust which has passed through the meshes of the screen.
The portion H¹ of the cone is not perforated and forms a shoot in continuation of

page_text: the screen, and has a central aperture h by which the coarse meal retained by the
screen is delivered to the hopper G supplying the set of edge runners next below by
which it is ground again, and so on throughout the series. The conical screen H
and shoot H¹ are suspended loosely by chains or links and receive a vibratory or
shaking motion from a tappet K on the vertical shaft striking corresponding lugs k
on the inside of the central delivery aperture of the screen. Scrapers and
brushes attached to arms carried round by the vertical shaft may if required be
applied upon the pans and sieves for preventing the adhesion of the reduced
material thereto. Each conical shoot I discharges into a circumferential spout J
leading between the double walls of the external casing which surrounds each
set of runners (except the uppermost) each casing discharging into the spout of the
casing below, the products of the siftings by the several screens being finally
collected in a hopper L placed beneath the screen H of the lowermost set. This
hopper has doors M for discharging the contents into sacks or other receptacles, and
it is provided with a central spout N for receiving the coarse residue from the last
screen H, said spout having a separate discharge aperture.
The edge runners and pans are made of cast iron or steel, and of a weight
adapted to the nature of the material to be crushed or pulverized. The double
casing J is made of sheet iron or steel, and in sections, so as to be removable as
may be required. The hoppers G may be made of cast or sheet iron. They
are clipped on the shaft, and may be shifted up and down as required. The
screens may be made of steel wire and of a suitable mesh and the conical
shoots I may be of sheet iron. The vertical shaft B may be driven through bevel
gear at top or bottom, as most convenient.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed I declare that what
I claim is;
1. In a mill for grinding minerals, the coned and corrugated form of the edge
runners and pan or table, substantially as shewn and described.
2. In a mill for grinding minerals, the combination with a coned pair of edge
runners and coned pan or table discharging at its circumference, of a conical
vibrating screen suspended beneath the same, discharging the residue at the centre
for the purpose of being conveyed to another mill below, a conical shoot fixed
beneath the sieve and coned in the opposite direction, and a circumferential casing
or spout receiving the material discharged from said shoot, all substantially as
shewn and described.
3. A mill for grinding minerals consisting of two or more superposed sets of
grinding machinery all driven by the same vertical shaft and each composed of a
pair of coned edge runners and a coned pan or table fed by a central hopper and
spouts and discharging at the circumference, a conical screen suspended beneath
each pan or table and receiving vibratory motion from the vertical shaft and
discharging into a central hopper beneath an oppositely coned shoot fixed to the
underside of the screen and vibrating therewith, a circumferential spout and double
casing and a double collecting hopper beneath, the whole for receiving the products
of the successive operations, the several sets of grinding and sifting machinery
being combined and arranged as herein shewn and described for successive operation
on the material to be ground.